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

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Date:   Fri, 28 Jul 2023 09:20:08 +0100
From:   David Howells <dhowells@...hat.com>
To:     syzbot <syzbot+607aa822c60b2e75b269@...kaller.appspotmail.com>
Cc:     dhowells@...hat.com, agruenba@...hat.com, arnd@...db.de,
        cluster-devel@...hat.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, rpeterso@...hat.com,
        syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk
Subject: Re: [syzbot] [gfs2?] kernel panic: hung_task: blocked tasks (2)

syzbot <syzbot+607aa822c60b2e75b269@...kaller.appspotmail.com> wrote:

> Fixes: 9c8ad7a2ff0b ("uapi, x86: Fix the syscall numbering of the mount API syscalls [ver #2]")

This would seem unlikely to be the culprit.  It just changes the numbering on
the fsconfig-related syscalls.

Running the test program on v6.5-rc3, however, I end up with the test process
stuck in the D state:

INFO: task repro-17687f1aa:5551 blocked for more than 120 seconds.
      Not tainted 6.5.0-rc3-build3+ #1448
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:repro-17687f1aa state:D stack:0     pid:5551  ppid:5516   flags:0x00004002
Call Trace:
 <TASK>
 __schedule+0x4a7/0x4f1
 schedule+0x66/0xa1
 schedule_timeout+0x9d/0xd7
 ? __next_timer_interrupt+0xf6/0xf6
 gfs2_gl_hash_clear+0xa0/0xdc
 ? sugov_irq_work+0x15/0x15
 gfs2_put_super+0x19f/0x1d3
 generic_shutdown_super+0x78/0x187
 kill_block_super+0x1c/0x32
 deactivate_locked_super+0x2f/0x61
 cleanup_mnt+0xab/0xcc
 task_work_run+0x6b/0x80
 exit_to_user_mode_prepare+0x76/0xfd
 syscall_exit_to_user_mode+0x14/0x31
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f89aac31dab
RSP: 002b:00007fff43d9b878 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fff43d9cad8 RCX: 00007f89aac31dab
RDX: 0000000000000000 RSI: 000000000000000a RDI: 00007fff43d9b920
RBP: 00007fff43d9c960 R08: 0000000000000000 R09: 0000000000000073
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007fff43d9cae8 R14: 0000000000417e18 R15: 00007f89aad51000
 </TASK>

David