RISC-V regression on Linux 6.7-rc1

[Ron Economos]

Linux 6.7-rc1 fails to boot on the HiFive Unmatched running Ubuntu 
22.04. During boot, there are many random oops and kernel panics. 
Reverting the patch series "riscv: Add remaining module relocations and 
tests" (commit b51fc88cb35e49) resolves the issue.

Here's an example, but it does something different on each boot.

Nov 17 21:33:38 riscv64 kernel: Unable to handle kernel paging request 
at virtual address ffffff97e6cb45fa
Nov 17 21:33:38 riscv64 kernel: Unable to handle kernel paging request 
at virtual address 0000005b7d944e0e
Nov 17 21:33:38 riscv64 kernel: Oops [#1]
Nov 17 21:33:38 riscv64 kernel: Modules linked in: sch_fq_codel 
auth_rpcgss nfs_acl drm(+) lockd grace backlight sunrpc efi_pstore 
ip_tables x_tables autofs4 btrfs blake2b_generic raid10 raid456 >
Nov 17 21:33:38 riscv64 kernel: CPU: 1 PID: 391 Comm: cloud-init Not 
tainted 6.7.0-rc1 #2
Nov 17 21:33:38 riscv64 kernel: Hardware name: SiFive HiFive Unmatched 
A00 (DT)
Nov 17 21:33:38 riscv64 kernel: epc : refill_obj_stock+0x4e/0x160
Nov 17 21:33:38 riscv64 kernel:  ra : refill_obj_stock+0x4e/0x160
Nov 17 21:33:38 riscv64 kernel: epc : ffffffff802d9264 ra : 
ffffffff802d9264 sp : ffffffd898e2fd10
Nov 17 21:33:38 riscv64 kernel:  gp : ffffffff81c4bdd8 tp : 
ffffffd884f9ec00 t0 : 0000000000000000
Nov 17 21:33:38 riscv64 kernel:  t1 : 0000000000000000 t2 : 
0000000000000000 s0 : ffffffd898e2fd60
Nov 17 21:33:38 riscv64 kernel:  s1 : ffffffdbfed02f70 a0 : 
ffffffd89a2b1ec0 a1 : 0000000000000000
Nov 17 21:33:38 riscv64 kernel:  a2 : 0000000000000000 a3 : 
0000000000000000 a4 : 0000000000000000
Nov 17 21:33:38 riscv64 kernel:  a5 : 0000000000000000 a6 : 
0000000000000000 a7 : 0000000000000000
Nov 17 21:33:38 riscv64 kernel:  s2 : 31413797e6cb45fa s3 : 
0000000000000108 s4 : 0000000200000022
Nov 17 21:33:38 riscv64 kernel:  s5 : ffffffff81cbb1e8 s6 : 
ffffffd884f9ec00 s7 : 0000003fc0325028
Nov 17 21:33:38 riscv64 kernel:  s8 : 0000000000000000 s9 : 
0000002b10fdc170 s10: 0000002b10fe2290
Nov 17 21:33:38 riscv64 kernel:  s11: 0000000000000000 t3 : 
0000000000000000 t4 : 0000000000000000
Nov 17 21:33:38 riscv64 kernel:  t5 : 0000000000000000 t6 : 0000000000000000
Nov 17 21:33:38 riscv64 kernel: status: 0000000200000100 badaddr: 
ffffff97e6cb45fa cause: 000000000000000d
Nov 17 21:33:38 riscv64 kernel: [<ffffffff802d9264>] 
refill_obj_stock+0x4e/0x160
Nov 17 21:33:38 riscv64 kernel: [<ffffffff802dce26>] 
obj_cgroup_uncharge+0x1c/0x2a
Nov 17 21:33:38 riscv64 kernel: [<ffffffff802b97a6>] 
kmem_cache_free+0x1b2/0x548
Nov 17 21:33:38 riscv64 kernel: [<ffffffff802f358c>] __fput+0x132/0x252
Nov 17 21:33:38 riscv64 kernel: [<ffffffff802f3702>] ____fput+0x18/0x22
Nov 17 21:33:38 riscv64 kernel: [<ffffffff80043e96>] task_work_run+0xa8/0xee
Nov 17 21:33:38 riscv64 kernel: [<ffffffff800bfc66>] 
exit_to_user_mode_loop.isra.0+0xf2/0x10e
Nov 17 21:33:38 riscv64 kernel: [<ffffffff80c4f2ac>] 
syscall_exit_to_user_mode+0x54/0x64
Nov 17 21:33:38 riscv64 kernel: [<ffffffff80c4eee0>] 
do_trap_ecall_u+0x5a/0x13a
Nov 17 21:33:38 riscv64 kernel: [<ffffffff80c5a716>] 
ret_from_exception+0x0/0x66
Nov 17 21:33:38 riscv64 kernel: Code: 639c 94be 689c 8963 0aa7 8526 f097 
ffff 80e7 26a0 (3783) 0009
Nov 17 21:33:38 riscv64 kernel: ---[ end trace 0000000000000000 ]---
Nov 17 21:33:38 riscv64 kernel: Oops [#2]
Nov 17 21:33:38 riscv64 kernel: note: cloud-init[391] exited with irqs 
disabled
Nov 17 21:33:38 riscv64 kernel: Modules linked in: sch_fq_codel 
auth_rpcgss nfs_acl drm(+) lockd grace backlight sunrpc efi_pstore 
ip_tables x_tables autofs4 btrfs blake2b_generic raid10 raid456 >
Nov 17 21:33:38 riscv64 kernel: CPU: 2 PID: 376 Comm: modprobe Tainted: 
G      D            6.7.0-rc1 #2
Nov 17 21:33:38 riscv64 kernel: Hardware name: SiFive HiFive Unmatched 
A00 (DT)
Nov 17 21:33:38 riscv64 kernel: epc : __kmem_cache_alloc_node+0x286/0x2fa
Nov 17 21:33:38 riscv64 kernel:  ra : __kmem_cache_alloc_node+0x5a/0x2fa
Nov 17 21:33:38 riscv64 kernel: epc : ffffffff802bacb8 ra : 
ffffffff802baa8c sp : ffffffd889f07940
Nov 17 21:33:38 riscv64 kernel:  gp : ffffffff81c4bdd8 tp : 
ffffffd898d84380 t0 : ffffffd88e1c3ae0
Nov 17 21:33:38 riscv64 kernel:  t1 : 0000940000000000 t2 : 
0000000000000000 s0 : ffffffd889f079a0
Nov 17 21:33:38 riscv64 kernel:  s1 : ffffffd880001700 a0 : 
26856bdb7d944dce a1 : 0000000000000717
Nov 17 21:33:38 riscv64 kernel:  a2 : 0000000000008500 a3 : 
ffffffff81cbb1e8 a4 : 26856bdb7d944e0e
Nov 17 21:33:38 riscv64 kernel:  a5 : 0e4e947ddb6b0026 a6 : 
000000000000ff00 a7 : 0000000000000718
Nov 17 21:33:38 riscv64 kernel:  s2 : 0000000000000000 s3 : 
0000000000000dc0 s4 : 0000000000000080
Nov 17 21:33:38 riscv64 kernel:  s5 : ffffffffffffffff s6 : 
ffffffff80466e7a s7 : ffffffff81c4c454
Nov 17 21:33:38 riscv64 kernel:  s8 : 0000000000000dc0 s9 : 
ffffffff024528c8 s10: ffffffff81b1b7d0
Nov 17 21:33:38 riscv64 kernel:  s11: ffffffff81b1b880 t3 : 
0000000000000000 t4 : 0000000000000000
Nov 17 21:33:38 riscv64 kernel:  t5 : 0000000000000000 t6 : ffffffd880d57554
Nov 17 21:33:38 riscv64 kernel: status: 0000000200000120 badaddr: 
0000005b7d944e0e cause: 000000000000000d
Nov 17 21:33:38 riscv64 kernel: [<ffffffff802bacb8>] 
__kmem_cache_alloc_node+0x286/0x2fa
Nov 17 21:33:38 riscv64 kernel: [<ffffffff80247cac>] kmalloc_trace+0x30/0xac
Nov 17 21:33:38 riscv64 kernel: [<ffffffff80466e7a>] 
eventfs_create_dir+0x46/0x158
Nov 17 21:33:38 riscv64 kernel: [<ffffffff8015c968>] 
event_create_dir+0xac/0x2e0
Nov 17 21:33:38 riscv64 kernel: [<ffffffff8015dcdc>] 
trace_module_notify+0x1d8/0x264
Nov 17 21:33:38 riscv64 kernel: [<ffffffff80049e28>] 
notifier_call_chain+0x6c/0xe8
Nov 17 21:33:38 riscv64 kernel: [<ffffffff80049f2c>] 
blocking_notifier_call_chain_robust+0x5a/0xc2
Nov 17 21:33:38 riscv64 kernel: [<ffffffff800c4390>] 
load_module+0x16dc/0x1d1a
Nov 17 21:33:38 riscv64 kernel: [<ffffffff800c4bfc>] 
init_module_from_file+0x82/0xc4
Nov 17 21:33:38 riscv64 kernel: [<ffffffff800c4dda>] 
__riscv_sys_finit_module+0x19c/0x33a
Nov 17 21:33:38 riscv64 kernel: [<ffffffff80c4eed4>] 
do_trap_ecall_u+0x4e/0x13a
Nov 17 21:33:38 riscv64 kernel: [<ffffffff80c5a716>] 
ret_from_exception+0x0/0x66
Nov 17 21:33:38 riscv64 kernel: Code: 0813 f008 5613 0287 e7b3 0117 7633 
0106 8893 0015 (6318) 8fd1
Nov 17 21:33:38 riscv64 kernel: ---[ end trace 0000000000000000 ]---
Nov 17 21:33:38 riscv64 systemd[1]: Finished Coldplug All udev Devices.
Nov 17 21:33:38 riscv64 kernel: Unable to handle kernel paging request 
at virtual address 0000005b7d944e0e
Nov 17 21:33:38 riscv64 kernel: Unable to handle kernel paging request 
at virtual address ffffff81e50b0eb6
Nov 17 21:33:38 riscv64 kernel: Oops [#3]