ARM64: kernel panics in DABT in sys_msync path

Yury Norov ynorov at caviumnetworks.com
Sun Sep 24 14:36:22 PDT 2017 

Hi all,

I found that running with qemu-10 with '-smp 4' option kernel v4.13 and 
v4.14-rc1 panics with LTP test rwtest03:
rwtest -N rwtest03 -c -q -i 60s -n 2  -f buffered -s mmread,mmwrite -m random -Dv 10%25000:mm-buff-$$
[ 2068.307587] Unable to handle kernel paging request at virtual address ffffffffc0000d68
[ 2068.308195] swapper pgtable: 4k pages, 48-bit VAs, pgd = ffff00000901f000
[ 2068.308387] [ffffffffc0000d68] *pgd=0000000000000000
[ 2068.308643] Internal error: Oops: 96000004 [#1] PREEMPT SMP
[ 2068.308865] Modules linked in:
[ 2068.309013] CPU: 0 PID: 9861 Comm: doio Not tainted 4.13.0-00027-g2fdc18baa2ae #196
[ 2068.309205] Hardware name: linux,dummy-virt (DT)
[ 2068.309331] task: ffff80000300d400 task.stack: ffff80003d28c000
[ 2068.309728] PC is at check_pte+0x8/0x130
[ 2068.309848] LR is at page_vma_mapped_walk+0x240/0x498
[ 2068.309995] pc : [<ffff0000081c5268>] lr : [<ffff0000081c55d0>] pstate: 00000145

[...]

[ 2068.338791] [<ffff0000081c5268>] check_pte+0x8/0x130
[ 2068.339070] [<ffff0000081c66c0>] page_mkclean_one+0xa0/0x258
[ 2068.339209] [<ffff0000081c6a70>] rmap_walk_file+0xe8/0x238
[ 2068.339331] [<ffff0000081c88c8>] rmap_walk+0x48/0x70
[ 2068.339436] [<ffff0000081c8ae8>] page_mkclean+0x80/0x98
[ 2068.339592] [<ffff00000819178c>] clear_page_dirty_for_io+0xac/0x298
[ 2068.339770] [<ffff0000082a36cc>] mpage_submit_page+0x2c/0x90
[ 2068.340004] [<ffff0000082a3864>] mpage_process_page_bufs+0x134/0x140
[ 2068.340261] [<ffff0000082a398c>] mpage_prepare_extent_to_map+0x11c/0x270
[ 2068.340438] [<ffff0000082a9058>] ext4_writepages+0x2f0/0xb30
[ 2068.340600] [<ffff000008193b78>] do_writepages+0x60/0x90
[ 2068.340742] [<ffff000008185a44>] __filemap_fdatawrite_range+0xa4/0xf0
[ 2068.340908] [<ffff0000081861c8>] file_write_and_wait_range+0x50/0xb8
[ 2068.341071] [<ffff000008299b40>] ext4_sync_file+0x80/0x340
[ 2068.341222] [<ffff00000823f668>] vfs_fsync_range+0x48/0xc8
[ 2068.341425] [<ffff0000081c51f4>] SyS_msync+0x1bc/0x228
[ 2068.341572] [<ffff00000808375c>] el0_svc_naked+0x20/0x24

The bug is reproducible for ilp32 and lp64 binaries. For kernel 4.12
and for all kernels if '-smp 1' is passed to qemu, everything works
fine. If no ideas, I think I'm able bisect it.

Some logs attached.

Yury
-------------- next part --------------
[ 2037.551071] LTP: starting rwtest03 (export LTPROOT; rwtest -N rwtest03 -c -q -i 60s -n 2  -f buffered -s mmread,mmwrite -m random -Dv 10%25000:mm-buff-$$)
[ 2068.307587] Unable to handle kernel paging request at virtual address ffffffffc0000d68
[ 2068.308195] swapper pgtable: 4k pages, 48-bit VAs, pgd = ffff00000901f000
[ 2068.308387] [ffffffffc0000d68] *pgd=0000000000000000
[ 2068.308643] Internal error: Oops: 96000004 [#1] PREEMPT SMP
[ 2068.308865] Modules linked in:
[ 2068.309013] CPU: 0 PID: 9861 Comm: doio Not tainted 4.13.0-00027-g2fdc18baa2ae #196
[ 2068.309205] Hardware name: linux,dummy-virt (DT)
[ 2068.309331] task: ffff80000300d400 task.stack: ffff80003d28c000
[ 2068.309728] PC is at check_pte+0x8/0x130
[ 2068.309848] LR is at page_vma_mapped_walk+0x240/0x498
[ 2068.309995] pc : [<ffff0000081c5268>] lr : [<ffff0000081c55d0>] pstate: 00000145
[ 2068.310184] sp : ffff80003d28f880
[ 2068.310280] x29: ffff80003d28f880 x28: 0000000000000000 
[ 2068.310437] x27: 00000000f73ad000 x26: 0008000000000080 
[ 2068.310589] x25: 00000000000001ad x24: 0040000000000041 
[ 2068.310742] x23: ffff000008d2e000 x22: ffff80003c5a3100 
[ 2068.310922] x21: ffff7e0000951ac0 x20: 0400000000000001 
[ 2068.311095] x19: ffff80003d28f948 x18: 0000000000000000 
[ 2068.311251] x17: 00000000f7f90d70 x16: ffff0000081c5038 
[ 2068.311410] x15: 000000000000001c x14: 000001e190b946b0 
[ 2068.311570] x13: 0000000000000000 x12: ffff8000093bc600 
[ 2068.311728] x11: 0000000000000001 x10: 0000000000000a00 
[ 2068.311923] x9 : ffff80003d28f860 x8 : ffff80000300de60 
[ 2068.312169] x7 : fffffffffff981d7 x6 : 0000001e1970e2d6 
[ 2068.312325] x5 : ffffffffffffffff x4 : ffff0000081c6620 
[ 2068.312478] x3 : 0000000000000000 x2 : 0000000000000001 
[ 2068.312630] x1 : ffffffffc0000d68 x0 : ffff80003d28f948 
[ 2068.312798] Process doio (pid: 9861, stack limit = 0xffff80003d28c000)
[ 2068.313012] Stack: (0xffff80003d28f880 to 0xffff80003d290000)
[ 2068.313241] f880: ffff80003d28f8d0 ffff0000081c66c0 00000000f73ad000 ffff80003d9e52e0
[ 2068.313448] f8a0: ffff80003d28fa14 00000000f73ae000 0040000000000001 ffff80001c4a9750
[ 2068.313650] f8c0: 0400000000000001 ffff80001c4a9750 ffff80003d28f980 ffff0000081c6a70
[ 2068.313851] f8e0: 00000000f73ad000 ffff7e0000951ac0 ffff80003d28fa18 00000000000001b0
[ 2068.314048] f900: 00000000000001b0 ffff80001c4a9750 0000000000000000 ffff80003d9e52e0
[ 2068.314248] f920: ffff80001c4a9778 0000000000000000 0000000000000001 00000000f73ae000
[ 2068.314449] f940: dead000000000100 ffff7e0000951ac0 ffff80003d9e52e0 00000000f73ad000
[ 2068.314648] f960: ffff80000939fdc8 ffffffffc0000d68 ffff7e000024f370 0000000000000001
[ 2068.314864] f980: ffff80003d28f9e0 ffff0000081c88c8 ffff7e0000951ac0 ffff80001c4a9750
[ 2068.315065] f9a0: 0000000000000001 ffff80001c4a95d8 ffff80003d28fbc0 0000000000000c34
[ 2068.315264] f9c0: 0000000000000000 ffff80001c4a9750 0000000000000002 ffff0000081c8ab8
[ 2068.315465] f9e0: ffff80003d28f9f0 ffff0000081c8ae8 ffff80003d28fa40 ffff00000819178c
[ 2068.315664] fa00: ffff7e0000951ac0 ffff7e0000c231c0 000000013d28fa80 ffff80003d28fa14
[ 2068.315904] fa20: ffff0000081c6620 0000000000000000 0000000000000000 ffff0000081c6350
[ 2068.316236] fa40: ffff80003d28fa80 ffff0000082a36cc ffff80003d28fc98 ffff7e0000951ac0
[ 2068.316562] fa60: ffff80003d28fba0 7ffffffffffffff6 ffff80003d28fbc0 0000000000000c34
[ 2068.316822] fa80: ffff80003d28faa0 ffff0000082a3864 0000000000000c35 ffff80003d28fc98
[ 2068.317033] faa0: ffff80003d28fad0 ffff0000082a398c ffff7e0000951ac0 ffff0000082a3910
[ 2068.318221] fac0: ffff80001c4a9750 000001b1081911e0 ffff80003d28fbc0 ffff0000082a9058
[ 2068.318419] fae0: ffff80001c4a9750 ffff80001c4a95d8 ffff800009166000 ffff80003d28fd40
[ 2068.318611] fb00: ffff800009166580 ffff80003c5a0ae8 00000000014000c0 0000000000000000
[ 2068.318803] fb20: ffff0000089ba1b8 ffff000008242548 ffff80003d28fb50 00000000000001b5
[ 2068.319005] fb40: 000000000000000e 0000000000000000 ffff7e00002831c0 ffff7e0000219a80
[ 2068.319198] fb60: ffff7e0000219ac0 ffff7e0000207980 ffff7e00002079c0 ffff7e000054fd80
[ 2068.319391] fb80: ffff7e000054fdc0 ffff7e0000c23180 ffff7e0000c231c0 ffff7e0000951ac0
[ 2068.319584] fba0: ffff7e0000a6c880 ffff7e0000a6c8c0 ffff7e0000040e00 ffff7e0000040e40
[ 2068.319775] fbc0: ffff80003d28fd00 ffff000008193b78 ffff80003d28fd40 ffff80001c4a9750
[ 2068.320070] fbe0: ffff80003daad000 0000000000000000 0000000000c34fff ffff80003c5a0ae8
[ 2068.320328] fc00: ffff80003c5a0a80 0000000000000000 0000000000000000 0000000000000000
[ 2068.320479] fc20: ffff0000089ba548 00000000082a3580 ffff80003d28fc50 ffff000008192f20
[ 2068.320633] fc40: ffff80003d0d7c00 0000000000000000 ffff800000000000 0000000000000001
[ 2068.320804] fc60: ffff7e0000e57bc0 ffff80003d28fc68 ffff80003d28fc68 ffff80003d28fc78
[ 2068.320974] fc80: ffff80003d28fc78 ffff80003d28fc88 ffff80003d28fc88 ffff80001c4a95d8
[ 2068.321148] fca0: ffff80003d28fd40 00000000000001b0 00000000000001b1 0000000000000c34
[ 2068.321317] fcc0: 0000000000000055 00000000f73c3000 ffff800008c0c7e8 ffff80003d28fd40
[ 2068.321486] fce0: ffff80003b660f00 ffff80003d473f40 000000000005a9b0 ffff00000823acc8
[ 2068.321737] fd00: ffff80003d28fd20 ffff000008185a44 ffff80001c4a9750 ffff80001c4a95d8
[ 2068.322020] fd20: ffff80003d28fda0 ffff0000081861c8 0000000000000000 ffff80001c4a9750
[ 2068.322270] fd40: 7ffffffffffffff6 0000000000000000 0000000000000000 0000000000c34fff
[ 2068.322496] fd60: 0000000000000001 ffff80003d0d7c58 ffff80001c4a95d8 0000000100000001
[ 2068.322747] fd80: 0000000000000000 0000000000009000 0000000000000000 0000000000000000
[ 2068.323038] fda0: ffff80003d28fde0 ffff000008299b40 0000000000000000 ffff80001c4a95d8
[ 2068.323269] fdc0: 0000000000000001 ffff800009166800 ffff80003daad000 0000000000000024
[ 2068.323508] fde0: ffff80003d28fe10 ffff00000823f668 ffff80003daad000 0000000000000000
[ 2068.323757] fe00: 00000000f7e32000 0000000000000004 ffff80003d28fe50 ffff0000081c51f4
[ 2068.324018] fe20: 00000000f71fd000 00000000f7e32000 00000000f71fd000 00000000f7e32000
[ 2068.324296] fe40: ffff80003d28fe50 ffff0000081c51d0 0000000000000000 ffff00000808375c
[ 2068.324566] fe60: 0000000000800000 00008000360fa000 ffffffffffffffff 00000000f7f90d98
[ 2068.324811] fe80: 0000000080000000 0000000000000015 0000000000000124 00000000000000e3
[ 2068.325056] fea0: ffff000008eb7000 ffff80000300d400 000000000dab929f ffffffff08e03000
[ 2068.325307] fec0: 00000000f71fd000 0000000000c35000 0000000000000004 00000000f7fa9000
[ 2068.325545] fee0: 00000000004614b7 00000000f73c3df3 61636f6c3a313638 6f643a74736f686c
[ 2068.325800] ff00: 00000000000000e3 686c61636f6c3a31 6f696f643a74736f 3a313638393a582a
[ 2068.326085] ff20: 6c3a313638393a58 74736f686c61636f 000000000000000c 000000000000001c
[ 2068.326334] ff40: 000000000041c10c 00000000f7f90d70 0000000000000000 00000000f71fd000
[ 2068.326569] ff60: 0000000000442180 00000000fffef368 0000000000442180 000000000043e208
[ 2068.326808] ff80: 0000000000000001 00000000f71fd000 0000000000442190 0000000000000005
[ 2068.334287] ffa0: 0000000000000002 00000000fffeeda0 0000000000403ba0 00000000fffeeda0
[ 2068.334607] ffc0: 00000000f7f90d98 0000000080000000 00000000f71fd000 00000000000000e3
[ 2068.335056] ffe0: 0000000000000000 0000000000000000 ffff80003d28fff0 ffff80003d28fff0
[ 2068.335565] Call trace:
[ 2068.335840] Exception stack(0xffff80003d28f6b0 to 0xffff80003d28f7e0)
[ 2068.336110] f6a0:                                   ffff80003d28f948 0001000000000000
[ 2068.336420] f6c0: ffff80003d28f880 ffff0000081c5268 ffff80003d28f6f0 ffff00000810a3d4
[ 2068.336723] f6e0: 000000000006ef10 ffff00000900b000 ffff80003d28f720 ffff0000080f5a30
[ 2068.337036] f700: ffff80000300d400 000000000006ef10 ffff80003d28f760 ffff000008187b48
[ 2068.337380] f720: ffff80003d0ea500 0000000001091220 0000000001091220 0000000000000000
[ 2068.337675] f740: ffff000008105e38 0000000000000000 ffff80003d28f948 ffffffffc0000d68
[ 2068.337875] f760: 0000000000000001 0000000000000000 ffff0000081c6620 ffffffffffffffff
[ 2068.338068] f780: 0000001e1970e2d6 fffffffffff981d7 ffff80000300de60 ffff80003d28f860
[ 2068.338259] f7a0: 0000000000000a00 0000000000000001 ffff8000093bc600 0000000000000000
[ 2068.338456] f7c0: 000001e190b946b0 000000000000001c ffff0000081c5038 00000000f7f90d70
[ 2068.338791] [<ffff0000081c5268>] check_pte+0x8/0x130
[ 2068.339070] [<ffff0000081c66c0>] page_mkclean_one+0xa0/0x258
[ 2068.339209] [<ffff0000081c6a70>] rmap_walk_file+0xe8/0x238
[ 2068.339331] [<ffff0000081c88c8>] rmap_walk+0x48/0x70
[ 2068.339436] [<ffff0000081c8ae8>] page_mkclean+0x80/0x98
[ 2068.339592] [<ffff00000819178c>] clear_page_dirty_for_io+0xac/0x298
[ 2068.339770] [<ffff0000082a36cc>] mpage_submit_page+0x2c/0x90
[ 2068.340004] [<ffff0000082a3864>] mpage_process_page_bufs+0x134/0x140
[ 2068.340261] [<ffff0000082a398c>] mpage_prepare_extent_to_map+0x11c/0x270
[ 2068.340438] [<ffff0000082a9058>] ext4_writepages+0x2f0/0xb30
[ 2068.340600] [<ffff000008193b78>] do_writepages+0x60/0x90
[ 2068.340742] [<ffff000008185a44>] __filemap_fdatawrite_range+0xa4/0xf0
[ 2068.340908] [<ffff0000081861c8>] file_write_and_wait_range+0x50/0xb8
[ 2068.341071] [<ffff000008299b40>] ext4_sync_file+0x80/0x340
[ 2068.341222] [<ffff00000823f668>] vfs_fsync_range+0x48/0xc8
[ 2068.341425] [<ffff0000081c51f4>] SyS_msync+0x1bc/0x228
[ 2068.341572] [<ffff00000808375c>] el0_svc_naked+0x20/0x24
[ 2068.341820] Code: a943e7b8 17ffffc2 f9401001 b9403002 (f9400021) 
[ 2068.342295] ---[ end trace 3f4dd4eaf4bfa846 ]---
[ 2068.342911] note: doio[9861] exited with preempt_count 1

[ 2523.805469] LTP: starting rwtest03 (export LTPROOT; rwtest -N rwtest03 -c -q -i 60s -n 2  -f buffered -s mmread,mmwrite -m random -Dv 10%25000:mm-buff-$$)
[ 2565.145947] Unable to handle kernel paging request at virtual address ffffffffc0000408
[ 2565.146363] Mem abort info:
[ 2565.146477]   Exception class = DABT (current EL), IL = 32 bits
[ 2565.146639]   SET = 0, FnV = 0
[ 2565.146735]   EA = 0, S1PTW = 0
[ 2565.146851] Data abort info:
[ 2565.146947]   ISV = 0, ISS = 0x00000004
[ 2565.147058]   CM = 0, WnR = 0
[ 2565.147201] swapper pgtable: 4k pages, 48-bit VAs, pgd = ffff000009068000
[ 2565.147380] [ffffffffc0000408] *pgd=0000000000000000
[ 2565.147628] Internal error: Oops: 96000004 [#1] PREEMPT SMP
[ 2565.147864] Modules linked in:
[ 2565.148015] CPU: 2 PID: 9879 Comm: doio Not tainted 4.14.0-rc1-00355-ga00c252d5d98 #199
[ 2565.148305] Hardware name: linux,dummy-virt (DT)
[ 2565.148490] task: ffff80003d3eba00 task.stack: ffff0000117c8000
[ 2565.149000] PC is at check_pte+0x8/0x150
[ 2565.149132] LR is at page_vma_mapped_walk+0x294/0x4c8
[ 2565.149285] pc : [<ffff0000081cb4c0>] lr : [<ffff0000081cb89c>] pstate: 00000145
[ 2565.149497] sp : ffff0000117cb880
[ 2565.149599] x29: ffff0000117cb880 x28: 0000000000000000 
[ 2565.149770] x27: 00000000f7c81000 x26: 0008000000000080 
[ 2565.149957] x25: 0000000000000081 x24: 0040000000000041 
[ 2565.150117] x23: ffff000008d64000 x22: ffff80003a2b0e00 
[ 2565.150265] x21: ffff7e0000043040 x20: 0400000000000001 
[ 2565.150416] x19: ffff0000117cb948 x18: 0000000000000000 
[ 2565.150568] x17: 00000000f7f90d70 x16: ffff0000081cb290 
[ 2565.150680] x15: 000000000000001c x14: ffff80003b9858f8 
[ 2565.150822] x13: 0000000000000000 x12: 000002553e979a20 
[ 2565.150966] x11: ffff7e0000043000 x10: 0000000000000001 
[ 2565.151111] x9 : 0000000000000001 x8 : 0000000000001200 
[ 2565.151215] x7 : 0000000000001200 x6 : 0000000000000000 
[ 2565.151319] x5 : ffffffffffffffff x4 : ffff0000081cc900 
[ 2565.151421] x3 : 0000000000000000 x2 : 0000000000000001 
[ 2565.151523] x1 : ffffffffc0000408 x0 : ffff0000117cb948 
[ 2565.151639] Process doio (pid: 9879, stack limit = 0xffff0000117c8000)
[ 2565.151823] Call trace:
[ 2565.151939] Exception stack(0xffff0000117cb740 to 0xffff0000117cb880)
[ 2565.152166] b740: ffff0000117cb948 ffffffffc0000408 0000000000000001 0000000000000000
[ 2565.152318] b760: ffff0000081cc900 ffffffffffffffff 0000000000000000 0000000000001200
[ 2565.152473] b780: 0000000000001200 0000000000000001 0000000000000001 ffff7e0000043000
[ 2565.152643] b7a0: 000002553e979a20 0000000000000000 ffff80003b9858f8 000000000000001c
[ 2565.152778] b7c0: ffff0000081cb290 00000000f7f90d70 0000000000000000 ffff0000117cb948
[ 2565.152950] b7e0: 0400000000000001 ffff7e0000043040 ffff80003a2b0e00 ffff000008d64000
[ 2565.153222] b800: 0040000000000041 0000000000000081 0008000000000080 00000000f7c81000
[ 2565.153454] b820: 0000000000000000 ffff0000117cb880 ffff0000081cb89c ffff0000117cb880
[ 2565.153638] b840: ffff0000081cb4c0 0000000000000145 ffff80003efc5500 ffff80003da13a00
[ 2565.153838] b860: 0001000000000000 ffff80003d3eba00 ffff0000117cb880 ffff0000081cb4c0
[ 2565.154136] [<ffff0000081cb4c0>] check_pte+0x8/0x150
[ 2565.154282] [<ffff0000081cc9a0>] page_mkclean_one+0xa0/0x270
[ 2565.154433] [<ffff0000081ccd68>] rmap_walk_file+0xe8/0x238
[ 2565.154575] [<ffff0000081ceb70>] rmap_walk+0x48/0x70
[ 2565.154702] [<ffff0000081ced90>] page_mkclean+0x80/0x98
[ 2565.154838] [<ffff000008196c14>] clear_page_dirty_for_io+0xac/0x298
[ 2565.154997] [<ffff0000082aabc4>] mpage_submit_page+0x2c/0x90
[ 2565.155143] [<ffff0000082aad5c>] mpage_process_page_bufs+0x134/0x140
[ 2565.155304] [<ffff0000082aae94>] mpage_prepare_extent_to_map+0x12c/0x2b0
[ 2565.155453] [<ffff0000082b0560>] ext4_writepages+0x2f0/0xb30
[ 2565.155600] [<ffff000008199078>] do_writepages+0x60/0x90
[ 2565.155741] [<ffff00000818b014>] __filemap_fdatawrite_range+0xa4/0xf0
[ 2565.155904] [<ffff00000818b228>] file_write_and_wait_range+0x38/0xb8
[ 2565.156134] [<ffff0000082a0ec8>] ext4_sync_file+0x80/0x340
[ 2565.156350] [<ffff000008245eb8>] vfs_fsync_range+0x48/0xc8
[ 2565.156531] [<ffff0000081cb44c>] SyS_msync+0x1bc/0x228
[ 2565.156666] Exception stack(0xffff0000117cbec0 to 0xffff0000117cc000)
[ 2565.156842] bec0: 00000000f71fd000 0000000000c35000 0000000000000004 00000000f7fa9000
[ 2565.157038] bee0: 000000000045e48f 00000000f7c84ef0 6f696f643a74736f 3a393738393a452a
[ 2565.157232] bf00: 00000000000000e3 452a6f696f643a74 6f6c3a393738393a 3a74736f686c6163
[ 2565.157428] bf20: 6f696f643a74736f 3a393738393a452a 0000000000000003 000000000000001c
[ 2565.157623] bf40: 000000000041c10c 00000000f7f90d70 0000000000000000 00000000f71fd000
[ 2565.157817] bf60: 0000000000454990 00000000fffef368 0000000000454990 000000000043e208
[ 2565.158039] bf80: 0000000000000001 00000000f71fd000 00000000004549a2 0000000000000005
[ 2565.158234] bfa0: 0000000000000002 00000000fffeeda0 0000000000403ba0 00000000fffeeda0
[ 2565.162032] bfc0: 00000000f7f90d98 0000000080000000 00000000f71fd000 00000000000000e3
[ 2565.162460] bfe0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[ 2565.162887] [<ffff0000080837dc>] el0_svc_naked+0x20/0x24
[ 2565.163331] Code: a943e7b8 17ffffc2 f9401001 b9403002 (f9400021) 
[ 2565.163991] ---[ end trace 7fdb561fda1604d0 ]---
[ 2565.164578] note: doio[9879] exited with preempt_count 1

export LTPROOT=/home/yury/ilp32; ./rwtest -N rwtest03 -c -q -i 60s -n 2  -f buffered -s mmread,mmwrite -m random -Dv 10%25000:mm-buff-$$
[  664.916027] Unable to handle kernel paging request at virtual address ffffffffc0000d48
[  664.916337] Mem abort info:
[  664.916483]   Exception class = DABT (current EL), IL = 32 bits
[  664.916959]   SET = 0, FnV = 0
[  664.917152]   EA = 0, S1PTW = 0
[  664.917355] Data abort info:
[  664.917519]   ISV = 0, ISS = 0x00000004
[  664.917750]   CM = 0, WnR = 0
[  664.918064] swapper pgtable: 4k pages, 48-bit VAs, pgd = ffff000009068000
[  664.918598] [ffffffffc0000d48] *pgd=0000000000000000
[  664.919835] Internal error: Oops: 96000004 [#1] PREEMPT SMP
[  664.920194] Modules linked in:
[  664.920621] CPU: 3 PID: 2332 Comm: doio Not tainted 4.14.0-rc1-00355-ga00c252d5d98 #199
[  664.920858] Hardware name: linux,dummy-virt (DT)
[  664.921091] task: ffff80003dbcba00 task.stack: ffff00000e3f0000
[  664.921643] PC is at check_pte+0x8/0x150
[  664.921778] LR is at page_vma_mapped_walk+0x294/0x4c8
[  664.921920] pc : [<ffff0000081cb4c0>] lr : [<ffff0000081cb89c>] pstate: 00000145
[  664.922104] sp : ffff00000e3f3880
[  664.922211] x29: ffff00000e3f3880 x28: 0000000000000000 
[  664.922389] x27: 00000000f7ba9000 x26: 0008000000000080 
[  664.922593] x25: 00000000000001a9 x24: 0040000000000041 
[  664.922768] x23: ffff000008d64000 x22: ffff8000090f5c00 
[  664.922936] x21: ffff7e0000396300 x20: 0400000000000001 
[  664.923102] x19: ffff00000e3f3948 x18: 0000000000000000 
[  664.923284] x17: 00000000f7f90d70 x16: ffff0000081cb290 
[  664.923453] x15: 000000000000001b x14: ffff8000111f8900 
[  664.923621] x13: 0000000000000040 x12: 0000000000000238 
[  664.923789] x11: ffff7e00003962c0 x10: 0000000000000001 
[  664.923956] x9 : 0000000000000001 x8 : 0000000000001200 
[  664.924134] x7 : 0000000000001200 x6 : 0000000000000000 
[  664.924297] x5 : ffffffffffffffff x4 : ffff0000081cc900 
[  664.924458] x3 : 0000000000000000 x2 : 0000000000000001 
[  664.924687] x1 : ffffffffc0000d48 x0 : ffff00000e3f3948 
[  664.924950] Process doio (pid: 2332, stack limit = 0xffff00000e3f0000)
[  664.925426] Call trace:
[  664.925603] Exception stack(0xffff00000e3f3740 to 0xffff00000e3f3880)
[  664.925876] 3740: ffff00000e3f3948 ffffffffc0000d48 0000000000000001 0000000000000000
[  664.926112] 3760: ffff0000081cc900 ffffffffffffffff 0000000000000000 0000000000001200
[  664.926318] 3780: 0000000000001200 0000000000000001 0000000000000001 ffff7e00003962c0
[  664.926585] 37a0: 0000000000000238 0000000000000040 ffff8000111f8900 000000000000001b
[  664.926810] 37c0: ffff0000081cb290 00000000f7f90d70 0000000000000000 ffff00000e3f3948
[  664.927005] 37e0: 0400000000000001 ffff7e0000396300 ffff8000090f5c00 ffff000008d64000
[  664.927205] 3800: 0040000000000041 00000000000001a9 0008000000000080 00000000f7ba9000
[  664.927405] 3820: 0000000000000000 ffff00000e3f3880 ffff0000081cb89c ffff00000e3f3880
[  664.927608] 3840: ffff0000081cb4c0 0000000000000145 ffff00000e3f38e0 ffff0000085dece8
[  664.927808] 3860: 0001000000000000 ffff0000080f3b0c ffff00000e3f3880 ffff0000081cb4c0
[  664.928161] [<ffff0000081cb4c0>] check_pte+0x8/0x150
[  664.928316] [<ffff0000081cc9a0>] page_mkclean_one+0xa0/0x270
[  664.928442] [<ffff0000081ccd68>] rmap_walk_file+0xe8/0x238
[  664.928667] [<ffff0000081ceb70>] rmap_walk+0x48/0x70
[  664.928852] [<ffff0000081ced90>] page_mkclean+0x80/0x98
[  664.929034] [<ffff000008196c14>] clear_page_dirty_for_io+0xac/0x298
[  664.929370] [<ffff0000082aabc4>] mpage_submit_page+0x2c/0x90
[  664.929588] [<ffff0000082aad5c>] mpage_process_page_bufs+0x134/0x140
[  664.929876] [<ffff0000082aae94>] mpage_prepare_extent_to_map+0x12c/0x2b0
[  664.930086] [<ffff0000082b0560>] ext4_writepages+0x2f0/0xb30
[  664.930273] [<ffff000008199078>] do_writepages+0x60/0x90
[  664.930486] [<ffff00000818b014>] __filemap_fdatawrite_range+0xa4/0xf0
[  664.930676] [<ffff00000818b228>] file_write_and_wait_range+0x38/0xb8
[  664.930877] [<ffff0000082a0ec8>] ext4_sync_file+0x80/0x340
[  664.931077] [<ffff000008245eb8>] vfs_fsync_range+0x48/0xc8
[  664.931319] [<ffff0000081cb44c>] SyS_msync+0x1bc/0x228
[  664.931485] Exception stack(0xffff00000e3f3ec0 to 0xffff00000e3f4000)
[  664.931681] 3ec0: 00000000f71fd000 0000000000c35000 0000000000000004 00000000f7fa9000
[  664.931894] 3ee0: 00000000004652f9 00000000f7babc55 3a74736f686c6163 323a572a6f696f64
[  664.932113] 3f00: 00000000000000e3 6f643a74736f686c 3333323a572a6f69 686c61636f6c3a32
[  664.932289] 3f20: 6c61636f6c3a3233 696f643a74736f68 000000000000000e 000000000000001b
[  664.932446] 3f40: 000000000041c10c 00000000f7f90d70 0000000000000000 00000000f71fd000
[  664.932678] 3f60: 000000000044df00 00000000fffef278 000000000044df00 000000000043e170
[  664.932847] 3f80: 0000000000000001 00000000f71fd000 000000000044df12 0000000000000003
[  664.933012] 3fa0: 0000000000000002 00000000fffeecb0 0000000000403ba0 00000000fffeecb0
[  664.933173] 3fc0: 00000000f7f90d98 0000000080000000 00000000f71fd000 00000000000000e3
[  664.933454] 3fe0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[  664.933774] [<ffff0000080837dc>] el0_svc_naked+0x20/0x24
[  664.934265] Code: a943e7b8 17ffffc2 f9401001 b9403002 (f9400021) 
[  664.934854] ---[ end trace 02dc23c2662a0380 ]---
[  664.935477] note: doio[2332] exited with preempt_count 1

[  109.569993] Unable to handle kernel paging request at virtual address ffffffffc00001a0
[  109.570748] Mem abort info:
[  109.571051]   Exception class = DABT (current EL), IL = 32 bits
[  109.571284]   SET = 0, FnV = 0
[  109.571417]   EA = 0, S1PTW = 0
[  109.571527] Data abort info:
[  109.571647]   ISV = 0, ISS = 0x00000004
[  109.572703]   CM = 0, WnR = 0
[  109.572888] swapper pgtable: 4k pages, 48-bit VAs, pgd = ffff000009068000
[  109.573060] [ffffffffc00001a0] *pgd=0000000000000000
[  109.573400] Internal error: Oops: 96000004 [#1] PREEMPT SMP
[  109.573550] Modules linked in:
[  109.573789] CPU: 1 PID: 1894 Comm: doio Not tainted 4.14.0-rc1-00355-ga00c252d5d98 #199
[  109.573928] Hardware name: linux,dummy-virt (DT)
[  109.574050] task: ffff800009142b80 task.stack: ffff00000e020000
[  109.574416] PC is at check_pte+0x8/0x150
[  109.574541] LR is at page_vma_mapped_walk+0x294/0x4c8
[  109.574640] pc : [<ffff0000081cb4c0>] lr : [<ffff0000081cb89c>] pstate: 00000145
[  109.574767] sp : ffff00000e023880
[  109.574880] x29: ffff00000e023880 x28: 0000000000000000 
[  109.575049] x27: 00000000f7234000 x26: 0008000000000080 
[  109.575150] x25: 0000000000000034 x24: 0040000000000041 
[  109.575267] x23: ffff000008d64000 x22: ffff800008c8df80 
[  109.575369] x21: ffff7e0000ddefc0 x20: 0400000000000001 
[  109.575473] x19: ffff00000e023948 x18: 0000000000000000 
[  109.575581] x17: 00000000f7f90d70 x16: ffff0000081cb290 
[  109.575684] x15: 000000000000001c x14: 000000000000000c 
[  109.575786] x13: 0000000000000000 x12: 0000001982daa520 
[  109.575887] x11: ffff7e0000ddef80 x10: 0000000000000001 
[  109.575989] x9 : 0000000000000001 x8 : 0000000000001200 
[  109.576089] x7 : 0000000000001200 x6 : 0000000000000000 
[  109.576196] x5 : ffffffffffffffff x4 : ffff0000081cc900 
[  109.576304] x3 : 0000000000000000 x2 : 0000000000000001 
[  109.576404] x1 : ffffffffc00001a0 x0 : ffff00000e023948 
[  109.576528] Process doio (pid: 1894, stack limit = 0xffff00000e020000)
[  109.576708] Call trace:
[  109.576857] Exception stack(0xffff00000e023740 to 0xffff00000e023880)
[  109.577032] 3740: ffff00000e023948 ffffffffc00001a0 0000000000000001 0000000000000000
[  109.577169] 3760: ffff0000081cc900 ffffffffffffffff 0000000000000000 0000000000001200
[  109.577302] 3780: 0000000000001200 0000000000000001 0000000000000001 ffff7e0000ddef80
[  109.577431] 37a0: 0000001982daa520 0000000000000000 000000000000000c 000000000000001c
[  109.577563] 37c0: ffff0000081cb290 00000000f7f90d70 0000000000000000 ffff00000e023948
[  109.577693] 37e0: 0400000000000001 ffff7e0000ddefc0 ffff800008c8df80 ffff000008d64000
[  109.577822] 3800: 0040000000000041 0000000000000034 0008000000000080 00000000f7234000
[  109.577950] 3820: 0000000000000000 ffff00000e023880 ffff0000081cb89c ffff00000e023880
[  109.578079] 3840: ffff0000081cb4c0 0000000000000145 ffff80003efb0500 ffff80003da12b80
[  109.578217] 3860: 0001000000000000 ffff800009142b80 ffff00000e023880 ffff0000081cb4c0
[  109.578437] [<ffff0000081cb4c0>] check_pte+0x8/0x150
[  109.578558] [<ffff0000081cc9a0>] page_mkclean_one+0xa0/0x270
[  109.578660] [<ffff0000081ccd68>] rmap_walk_file+0xe8/0x238
[  109.578806] [<ffff0000081ceb70>] rmap_walk+0x48/0x70
[  109.578972] [<ffff0000081ced90>] page_mkclean+0x80/0x98
[  109.579148] [<ffff000008196c14>] clear_page_dirty_for_io+0xac/0x298
[  109.579273] [<ffff0000082aabc4>] mpage_submit_page+0x2c/0x90
[  109.579441] [<ffff0000082aad5c>] mpage_process_page_bufs+0x134/0x140
[  109.579582] [<ffff0000082aae94>] mpage_prepare_extent_to_map+0x12c/0x2b0
[  109.579797] [<ffff0000082b0560>] ext4_writepages+0x2f0/0xb30
[  109.579959] [<ffff000008199078>] do_writepages+0x60/0x90
[  109.580110] [<ffff00000818b014>] __filemap_fdatawrite_range+0xa4/0xf0
[  109.580288] [<ffff00000818b228>] file_write_and_wait_range+0x38/0xb8
[  109.580462] [<ffff0000082a0ec8>] ext4_sync_file+0x80/0x340
[  109.580631] [<ffff000008245eb8>] vfs_fsync_range+0x48/0xc8
[  109.580837] [<ffff0000081cb44c>] SyS_msync+0x1bc/0x228
[  109.580977] Exception stack(0xffff00000e023ec0 to 0xffff00000e024000)
[  109.581160] 3ec0: 00000000f71fd000 0000000000c35000 0000000000000004 00000000f7fa9000
[  109.581367] 3ee0: 0000000000463d9b 00000000f723f497 3a343938313a4d2a 736f686c61636f6c
[  109.581550] 3f00: 00000000000000e3 6f6c3a343938313a 3a74736f686c6163 313a4d2a6f696f64
[  109.581750] 3f20: 74736f686c61636f 3a4d2a6f696f643a 000000000000000c 000000000000001c
[  109.581964] 3f40: 000000000041c10c 00000000f7f90d70 0000000000000000 00000000f71fd000
[  109.582178] 3f60: 000000000044a8f0 00000000fffef278 000000000044a8f0 000000000043e208
[  109.582394] 3f80: 0000000000000001 00000000f71fd000 000000000044a900 0000000000000004
[  109.582649] 3fa0: 0000000000000002 00000000fffeecb0 0000000000403ba0 00000000fffeecb0
[  109.582867] 3fc0: 00000000f7f90d98 0000000080000000 00000000f71fd000 00000000000000e3
[  109.583074] 3fe0: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[  109.583242] [<ffff0000080837dc>] el0_svc_naked+0x20/0x24
[  109.583553] Code: a943e7b8 17ffffc2 f9401001 b9403002 (f9400021) 
[  109.583981] ---[ end trace 0fb20762cb6e4457 ]---
[  109.584508] note: doio[1894] exited with preempt_count 1

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