Re: [syzbot] [kernel?] INFO: task hung in ret_from_fork (4)

[syzbot <syzbot+7c11975a7e4a2735d529@syzkaller.appspotmail.com>]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
INFO: task hung in synchronize_rcu

INFO: task kworker/u8:5:131 blocked for more than 161 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:5    state:D stack:19936 pid:131   tgid:131   ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events_unbound fsnotify_connector_destroy_workfn
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5298 [inline]
 __schedule+0x15dd/0x52d0 kernel/sched/core.c:6911
 __schedule_loop kernel/sched/core.c:6993 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7008
 schedule_timeout+0xc3/0x2c0 kernel/time/sleep_timeout.c:75
 do_wait_for_common kernel/sched/completion.c:100 [inline]
 __wait_for_common kernel/sched/completion.c:121 [inline]
 wait_for_common kernel/sched/completion.c:132 [inline]
 wait_for_completion+0x2cc/0x5e0 kernel/sched/completion.c:153
 __synchronize_srcu+0x329/0x3e0 kernel/rcu/srcutree.c:1520


Tested on:

commit:         a989fde7 Merge tag 'libnvdimm-fixes-7.0-rc5' of git://..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1724a06a580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b643133b3e44c9fd
dashboard link: https://syzkaller.appspot.com/bug?extid=7c11975a7e4a2735d529
compiler:       Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=1140cf4a580000