CONFIG_MTD_NAND_VERIFY_WRITE and GPMI NAND patch kernel panic.

Wed Sep 21 22:09:54 EDT 2011

Hello,

I have been testing the GPMI NAND patch on iMX28 based platform.

My git tree  based on git://git.infradead.org/users/dedekind/l2-mtd-2.6.git and I have applied patches that Huang Shijie had emailed out ( ref: http://marc.info/?l=linux-arm-kernel&m=131416896219539&w=2 )

I see following kernel panic, if I have kernel compiled with option, CONFIG_MTD_NAND_VERIFY_WRITE=y.
Unfortunately I don't have another non iMX28 hardware to try if this is CONFIG_MTD_NAND_VERIFY_WRITE option issue or the GPMI NAND that is causing this.

However if I turn off this flag, everything works fine. Has anyone seen issue when using VERIFY_WRITE option on other platforms? 

If you have iMX28 based platform and are testing Huang's patchset would you mind turning on VERIFY_WRITE option and see if you get same results?

I am not familiar with MTD source code in long time, but I will familiarize myself with this code and see if I find something, would appreciate any pointer on any debug flags to turn on.

Kernel trace back when using VERIFY_WRITE option:

formatting eraseblock 0 [   31.830000] Unable to handle kernel NULL pointer dereference at virtual address 00000000
ubifo[   31.840000] pgd = c3a64000
ubiformat: formatting e, *ppte=00000000raseblock 2 --  0 % compock 1 --  0 % complete  , *pte=00000000
lete  [   31.860000] Internal error: Oops: 17 [#1]
[   31.860000] Modules linked in:
[   31.860000] CPU: 0    Not tainted  (3.1.0-rc2-amp-10076-g3fefe97-dirty #8)
[   31.860000] PC is at nand_verify_buf+0x74/0xc4
[   31.860000] LR is at console_unlock+0x174/0x210
[   31.860000] pc : [<c02e63e8>]    lr : [<c0025b64>]    psr: 20000013
[   31.860000] sp : c3a55d98  ip : c3a55cb8  fp : c3a55db4
[   31.860000] r10: 00000800  r9 : 00000000  r8 : c3920878
[   31.860000] r7 : 00002880  r6 : c3a06000  r5 : 00000800  r4 : c3920878
[   31.860000] r3 : c05f7d34  r2 : 00000055  r1 : 00000000  r0 : 00000000
[   31.860000] Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
[   31.860000] Control: 0005317f  Table: 43a64000  DAC: 00000015
[   31.860000] Process ubiformat (pid: 61, stack limit = 0xc3a54270)
[   31.860000] Stack: (0xc3a55d98 to 0xc3a56000)
[   31.860000] 5d80:                                                       c3920878 c3920a98
[   31.860000] 5da0: c3a06000 00002880 c3a55ddc c3a55db8 c02e61c8 c02e6384 c3a55ddc c3a55dc8
[   31.860000] 5dc0: 01440000 00000800 c3a55e60 c3920a98 c3a55e54 c3a55de0 c02e7460 c02e6124
[   31.860000] 5de0: 00000000 00000000 c029c620 c3a06000 00000000 c3811000 0ffe0000 00000000
[   31.860000] 5e00: c39d3000 00000000 00002880 00002880 0000003f 00000000 00001000 00000040
[   31.860000] 5e20: 00000000 c3a06000 00000000 00000800 c3920a98 01440000 00000000 01569fa8
[   31.860000] 5e40: 00000000 c3a4dfe0 c3a55e9c c3a55e58 c02e77e4 c02e72a8 c3a55e60 00000000
[   31.860000] 5e60: c39d89e0 00000800 00000000 00001000 c3a55eac c3a55e80 c3a06000 00000000
[   31.860000] 5e80: 00040000 00000000 00000800 c3a55f70 c3a55ecc c3a55ea0 c02cab14 c02e774c
[   31.860000] 5ea0: 00000800 c3a55f08 c3a06000 00000800 c39b0c00 00000800 00000800 c39b0c00
[   31.860000] 5ec0: c3a55f3c c3a55ed0 c02ce21c c02caa8c 00000800 c3a55f08 c3a06000 c020c8c4
[   31.860000] 5ee0: c3a06000 c3a54000 00000003 00040000 00000000 c3a5c300 c3a55f3c c3a55f08
[   31.860000] 5f00: c00f2874 c020c050 00000000 00000800 c0282084 c3a5c300 00000800 01569fa8
[   31.860000] 5f20: c3a55f70 c3a54000 c3a54000 00000000 c3a55f6c c3a55f40 c00f3498 c02ce120
[   31.860000] 5f40: 00040000 00000000 00040000 00000000 c3a5c300 00000800 01569fa8 00000000
[   31.860000] 5f60: c3a55fa4 c3a55f70 c00f3654 c00f33e8 00040000 00000000 00000000 00000000
[   31.860000] 5f80: ffffffff 00040000 beb57a40 00020000 00000004 c0009148 00000000 c3a55fa8
[   31.860000] 5fa0: c0008f00 c00f3618 00040000 beb57a40 00000003 01569fa8 00000800 00000800
[   31.860000] 5fc0: 00040000 beb57a40 00020000 00000004 00000000 00000800 00000002 00000003
[   31.860000] 5fe0: 00000000 beb57980 0000e140 4013babc 60000010 00000003 00000000 00000000
[   31.860000] Backtrace: 
[   31.860000] [<c02e6374>] (nand_verify_buf+0x0/0xc4) from [<c02e61c8>] (nand_write_page+0xb4/0x110)
[   31.860000]  r7:00002880 r6:c3a06000 r5:c3920a98 r4:c3920878
[   31.860000] [<c02e6114>] (nand_write_page+0x0/0x110) from [<c02e7460>] (nand_do_write_ops+0x1c8/0x3b8)
[   31.860000]  r7:c3920a98 r6:c3a55e60 r5:00000800 r4:01440000
[   31.860000] [<c02e7298>] (nand_do_write_ops+0x0/0x3b8) from [<c02e77e4>] (nand_write+0xa8/0xc4)
[   31.860000] [<c02e773c>] (nand_write+0x0/0xc4) from [<c02cab14>] (part_write+0x98/0xbc)
[   31.860000]  r7:c3a55f70 r6:00000800 r5:00000000 r4:00040000
[   31.860000] [<c02caa7c>] (part_write+0x0/0xbc) from [<c02ce21c>] (mtd_write+0x10c/0x244)
[   31.860000]  r6:c39b0c00 r5:00000800 r4:00000800
[   31.860000] [<c02ce110>] (mtd_write+0x0/0x244) from [<c00f3498>] (vfs_write+0xc0/0x190)
[   31.860000] [<c00f33d8>] (vfs_write+0x0/0x190) from [<c00f3654>] (sys_write+0x4c/0x7c)
[   31.860000] [<c00f3608>] (sys_write+0x0/0x7c) from [<c0008f00>] (ret_fast_syscall+0x0/0x2c)
[   31.860000]  r8:c0009148 r7:00000004 r6:00020000 r5:beb57a40 r4:00040000
[   31.860000] Code: e3550000 da00000d e5940000 e5d62000 (e5d03000) 
[   32.200000] ---[ end trace db93856cc48a0e71 ]---
[   32.210000] Kernel panic - not syncing: Fatal exception
[   32.210000] Backtrace: 
[   32.220000] [<c000c98c>] (dump_backtrace+0x0/0x114) from [<c044e99c>] (dump_stack+0x20/0x24)
[   32.220000]  r7:c02e63ea r6:c3a54000 r5:00000001 r4:00000001
[   32.230000] [<c044e97c>] (dump_stack+0x0/0x24) from [<c044ea08>] (panic+0x68/0x1b8)
[   32.240000] [<c044e9a0>] (panic+0x0/0x1b8) from [<c000cd1c>] (die+0x27c/0x308)
[   32.250000]  r3:c0624b28 r2:00000001 r1:000032bb r0:c053fedc
[   32.250000] [<c000caa0>] (die+0x0/0x308) from [<c0010130>] (__do_kernel_fault+0x74/0x94)
[   32.260000] [<c00100bc>] (__do_kernel_fault+0x0/0x94) from [<c0452cc4>] (do_page_fault+0xb4/0x35c)
[   32.270000]  r9:00000000 r8:00010000 r7:c39ee480 r6:00000000 r5:c3a55d50
[   32.280000] r4:c3a4acb8
[   32.280000] [<c0452c10>] (do_page_fault+0x0/0x35c) from [<c0008658>] (do_DataAbort+0x44/0xa8)
[   32.290000] [<c0008614>] (do_DataAbort+0x0/0xa8) from [<c0451298>] (__dabt_svc+0x38/0x60)
[   32.300000] Exception stack(0xc3a55d50 to 0xc3a55d98)
[   32.300000] 5d40:                                     00000000 00000000 00000055 c05f7d34
[   32.310000] 5d60: c3920878 00000800 c3a06000 00002880 c3920878 00000000 00000800 c3a55db4
[   32.320000] 5d80: c3a55cb8 c3a55d98 c0025b64 c02e63e8 20000013 ffffffff
[   32.320000]  r8:c3920878 r7:c3a55d84 r6:ffffffff r5:20000013 r4:c02e63e8
[   32.330000] [<c02e6374>] (nand_verify_buf+0x0/0xc4) from [<c02e61c8>] (nand_write_page+0xb4/0x110)
[   32.340000]  r7:00002880 r6:c3a06000 r5:c3920a98 r4:c3920878
[   32.350000] [<c02e6114>] (nand_write_page+0x0/0x110) from [<c02e7460>] (nand_do_write_ops+0x1c8/0x3b8)
[   32.360000]  r7:c3920a98 r6:c3a55e60 r5:00000800 r4:01440000
[   32.360000] [<c02e7298>] (nand_do_write_ops+0x0/0x3b8) from [<c02e77e4>] (nand_write+0xa8/0xc4)
[   32.370000] [<c02e773c>] (nand_write+0x0/0xc4) from [<c02cab14>] (part_write+0x98/0xbc)
[   32.380000]  r7:c3a55f70 r6:00000800 r5:00000000 r4:00040000
[   32.380000] [<c02caa7c>] (part_write+0x0/0xbc) from [<c02ce21c>] (mtd_write+0x10c/0x244)
[   32.390000]  r6:c39b0c00 r5:00000800 r4:00000800
[   32.400000] [<c02ce110>] (mtd_write+0x0/0x244) from [<c00f3498>] (vfs_write+0xc0/0x190)
[   32.400000] [<c00f33d8>] (vfs_write+0x0/0x190) from [<c00f3654>] (sys_write+0x4c/0x7c)
[   32.410000] [<c00f3608>] (sys_write+0x0/0x7c) from [<c0008f00>] (ret_fast_syscall+0x0/0x2c)
[   32.420000]  r8:c0009148 r7:00000004 r6:00020000 r5:beb57a40 r4:00040000

-Subodh Nijsure

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