linux-kernel - [syzbot] [gfs2?] kernel panic: hung

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Message-ID: <0000000000000cf7de0601056232@google.com>
Date:   Fri, 21 Jul 2023 13:48:11 -0700
From:   syzbot <syzbot+607aa822c60b2e75b269@...kaller.appspotmail.com>
To:     cluster-devel@...hat.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [gfs2?] kernel panic: hung_task: blocked tasks (2)

Hello,

syzbot found the following issue on:

HEAD commit:    fdf0eaf11452 Linux 6.5-rc2
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=1797783aa80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=27e33fd2346a54b
dashboard link: https://syzkaller.appspot.com/bug?extid=607aa822c60b2e75b269
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11322fb6a80000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17687f1aa80000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/0ac950f24d26/disk-fdf0eaf1.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/666fcbcfa05d/vmlinux-fdf0eaf1.xz
kernel image: https://storage.googleapis.com/syzbot-assets/5bbe73baa630/bzImage-fdf0eaf1.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/85821d156573/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+607aa822c60b2e75b269@...kaller.appspotmail.com

Kernel panic - not syncing: hung_task: blocked tasks
CPU: 0 PID: 27 Comm: khungtaskd Not tainted 6.5.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 panic+0x6a4/0x750 kernel/panic.c:340
 check_hung_uninterruptible_tasks kernel/hung_task.c:226 [inline]
 watchdog+0xcf2/0x11b0 kernel/hung_task.c:379
 kthread+0x33a/0x430 kernel/kthread.c:389
 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:296
RIP: 0000:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0000:0000000000000000 EFLAGS: 00000000 ORIG_RAX: 0000000000000000
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Kernel Offset: disabled
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 syzkaller@...glegroups.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 syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

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