Re: [syzbot] [riscv?] riscv/fixes test error: kernel panic: Kernel stack overflow

[Alexandre Ghiti]

On 15/09/2024 18:09, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    7c1e5b9690b0 riscv: Disable preemption while handling PR_R..
> git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git fixes
> console output: https://syzkaller.appspot.com/x/log.txt?x=1618e900580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=c79e90d7b2f5b364
> dashboard link: https://syzkaller.appspot.com/bug?extid=ba9eac24453387a9d502
> compiler:       riscv64-linux-gnu-gcc (Debian 12.2.0-13) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> userspace arch: riscv64
>
> Downloadable assets:
> disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/a741b348759c/non_bootable_disk-7c1e5b96.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/71b65c326093/vmlinux-7c1e5b96.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/4110f50eed32/Image-7c1e5b96.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+ba9eac24453387a9d502@xxxxxxxxxxxxxxxxxxxxxxxxx
>
>   s11: ff60000011ee5b20 t3 : ffffffffffffffff t4 : fffffffef12c91f0
>   t5 : ffffffff89655e40 t6 : 1fec0000023dcb6d
> status: 0000000200000100 badaddr: ff20000000087fe8 cause: 000000000000000f
> Kernel panic - not syncing: Kernel stack overflow
> CPU: 0 UID: 0 PID: 16 Comm: ksoftirqd/0 Not tainted 6.11.0-rc2-syzkaller-g7c1e5b9690b0 #0
> Hardware name: riscv-virtio,qemu (DT)
> Call Trace:
> [<ffffffff80010216>] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:130
> [<ffffffff85edbd86>] show_stack+0x34/0x40 arch/riscv/kernel/stacktrace.c:136
> [<ffffffff85f3735e>] __dump_stack lib/dump_stack.c:93 [inline]
> [<ffffffff85f3735e>] dump_stack_lvl+0x108/0x196 lib/dump_stack.c:119
> [<ffffffff85f37408>] dump_stack+0x1c/0x24 lib/dump_stack.c:128
> [<ffffffff85edc94a>] panic+0x388/0x806 kernel/panic.c:348
> [<ffffffff8000fcee>] handle_bad_stack+0xe4/0x10c arch/riscv/kernel/traps.c:427
> [<ffffffff8022b788>] __bfs_backwards kernel/locking/lockdep.c:1843 [inline]
> [<ffffffff8022b788>] check_irq_usage+0x1d6/0x1466 kernel/locking/lockdep.c:2803
> SMP: stopping secondary CPUs
> Rebooting in 86400 seconds..
>
>
> ---
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So this one should be fixed by 
https://lore.kernel.org/all/20240917150328.59831-1-alexghiti@xxxxxxxxxxxx/T/