Regression on Linux 6.0-rc1

[Ron Economos]

The following Oops occurs on Linux 6.0-rc1 on the HiFive Unmatched. This 
is with gcc 11.2.0 and binutils 2.38 (from 
https://github.com/riscv-collab/riscv-gnu-toolchain).

Begin: Loading essential drivers ... [   14.774748] Unable to handle 
kernel paging request at virtual address ffffffff813cdc90
[   14.781976] Oops [#1]
[   14.784163] Modules linked in: raid6_pq(+) libcrc32c raid1 raid0 
multipath linear da9063_regulator
[   14.800763] CPU: 1 PID: 248 Comm: modprobe Not tainted 6.0.0-rc1 #1
[   14.806747] Hardware name: SiFive HiFive Unmatched A00 (DT)
[   14.812307] epc : jump_label_module_notify+0x1bc/0x270
[   14.817430]  ra : jump_label_module_notify+0x19a/0x270
[   14.822555] epc : ffffffff801b804c ra : ffffffff801b802a sp : 
ffffffc80424bc0
[   14.829766]  gp : ffffffff81a2d7b8 tp : ffffffd895ae1980 t0 : 
ffffffd88067e20
[   14.836975]  t1 : 6f1d98585898183f t2 : ffffffdbfed19e58 s0 : 
ffffffc80424bc0
[   14.844185]  s1 : ffffffff813cdc88 a0 : 0000000000000000 a1 : 
000000000000000
[   14.851394]  a2 : 0000000000000000 a3 : ffffffff01c77000 a4 : 
000000000000000
[   14.858602]  a5 : 0000000000000000 a6 : 0000000000ff0000 a7 : 
000000000000021
[   14.865812]  s2 : ffffffff01c73000 s3 : ffffffff01c740c0 s4 : 
ffffffd88067e80
[   14.873021]  s5 : ffffffff01c73010 s6 : 0000000000000dc0 s7 : 
ffffffff813cdf0
[   14.880230]  s8 : ffffffd88067e282 s9 : ffffffff01c73008 s10: 
000000000000002
[   14.887439]  s11: ffffffc80424bd50 t3 : e26cb9592a0e8a69 t4 : 
000000800000000
[   14.894649]  t5 : 000000ff00000000 t6 : ffffffd8819ac4a0
[   14.899945] status: 0000000200000120 badaddr: ffffffff813cdc90 cause: 
000000f
[   14.907853] [<ffffffff8004055a>] 
blocking_notifier_call_chain_robust+0x72/0x8
[   14.915061] [<ffffffff800a1dfc>] load_module+0x17bc/0x1e98
[   14.920531] [<ffffffff800a2718>] __do_sys_finit_module+0x98/0x100
[   14.926611] [<ffffffff800a27a4>] sys_finit_module+0x24/0x30
[   14.932170] [<ffffffff80003ca6>] ret_from_syscall+0x0/0x2
[   14.937680] ---[ end trace 0000000000000000 ]---
Segmentation fault

Manually bisected to this commit:

arch/riscv: add Zihintpause support

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8eb060e10185cfc97ef0200d197ec246ba0f9f8c