[riscv?] kernel panic: Kernel stack overflow

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: b104dbedbe61 Documentation: RISC-V: patch-acceptance: ment..
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=1391d897280000
kernel config: https://syzkaller.appspot.com/x/.config?x=ed6592854c33eb63
dashboard link: https://syzkaller.appspot.com/bug?extid=3f3bba96295371282a99
compiler: riscv64-linux-gnu-gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: riscv64
CC: [a...@eecs.berkeley.edu linux-...@vger.kernel.org linux...@lists.infradead.org pal...@dabbelt.com paul.w...@sifive.com]

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/a741b348759c/non_bootable_disk-b104dbed.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/84dc3813c212/vmlinux-b104dbed.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a760b8ab47cf/Image-b104dbed.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3f3bba...@syzkaller.appspotmail.com

s11: ff6000004050bd40 t3 : fffffffff3f3f300 t4 : ffffffff801349ac
t5 : 1fe4000000a44048 t6 : ff20000005220e98
status: 0000000000000100 badaddr: ff2000000521fff0 cause: 000000000000000f
Kernel panic - not syncing: Kernel stack overflow
CPU: 0 PID: 17066 Comm: syz-executor.1 Not tainted 6.4.0-rc1-syzkaller-00012-gb104dbedbe61 #0
Hardware name: riscv-virtio,qemu (DT)
Call Trace:
[<ffffffff8000aa96>] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:121
[<ffffffff834dd8b4>] show_stack+0x34/0x40 arch/riscv/kernel/stacktrace.c:127
[<ffffffff8351d78e>] __dump_stack lib/dump_stack.c:88 [inline]
[<ffffffff8351d78e>] dump_stack_lvl+0xe0/0x14c lib/dump_stack.c:106
[<ffffffff8351d816>] dump_stack+0x1c/0x24 lib/dump_stack.c:113
[<ffffffff834de0de>] panic+0x27c/0x662 kernel/panic.c:340
[<ffffffff8000a706>] walk_stackframe+0x0/0x2fe arch/riscv/kernel/traps.c:390
[<ffffffff8013387c>] mark_lock+0x16c/0xe1a kernel/locking/lockdep.c:4620
SMP: stopping secondary CPUs
Rebooting in 86400 seconds..


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the bug is already fixed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want to change bug's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the bug is a duplicate of another bug, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.