On Fri, 15 Sep 2023 13:46:04 +1000, Benjamin Gray wrote:
> Syzkaller reported a sleep in atomic context bug relating to the HASHCHK
> handler logic
>
> BUG: sleeping function called from invalid context at
> arch/powerpc/kernel/traps.c:1518
> in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 25040, name:
> syz-executor
> preempt_count: 0, expected: 0
> RCU nest depth: 0, expected: 0
> no locks held by syz-executor/25040.
> irq event stamp: 34
> hardirqs last enabled at (33): [<c000000000048b38>]
> prep_irq_for_enabled_exit arch/powerpc/kernel/interrupt.c:56 [inline]
> hardirqs last enabled at (33): [<c000000000048b38>]
> interrupt_exit_user_prepare_main+0x148/0x600
> arch/powerpc/kernel/interrupt.c:230
> hardirqs last disabled at (34): [<c00000000003e6a4>]
> interrupt_enter_prepare+0x144/0x4f0 arch/powerpc/include/asm/interrupt.h:176
> softirqs last enabled at (0): [<c000000000281954>]
> copy_process+0x16e4/0x4750 kernel/fork.c:2436
> softirqs last disabled at (0): [<0000000000000000>] 0x0
> CPU: 15 PID: 25040 Comm: syz-executor Not tainted
> 6.5.0-rc5-00001-g3ccdff6bb06d #3
> Hardware name: IBM,9105-22A POWER10 (raw) 0x800200 0xf000006
> of:IBM,FW1040.00 (NL1040_021) hv:phyp pSeries
> Call Trace:
> [c0000000a8247ce0] [c00000000032b0e4] __might_resched+0x3b4/0x400
> kernel/sched/core.c:10189
> [c0000000a8247d80] [c0000000008c7dc8] __might_fault+0xa8/0x170
> mm/memory.c:5853
> [c0000000a8247dc0] [c00000000004160c] do_program_check+0x32c/0xb20
> arch/powerpc/kernel/traps.c:1518
> [c0000000a8247e50] [c000000000009b2c] program_check_common_virt+0x3bc/0x3c0
>
> [...]
Applied to powerpc/fixes.
[1/1] powerpc/dexcr: Move HASHCHK trap handler
https://git.kernel.org/powerpc/c/c3f4309693758b13fbb34b3741c2e2801ad28769
cheers
