INFO: task can't die in ntfs_collate_names

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: aa14a3016182 Add linux-next specific files for 20210910
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=17c39465300000
kernel config: https://syzkaller.appspot.com/x/.config?x=e400f2d70a0ed309
dashboard link: https://syzkaller.appspot.com/bug?extid=2386c4b12e7a0be10559
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1
CC: [an...@tuxera.com linux-...@vger.kernel.org linux-n...@lists.sourceforge.net]

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

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2386c4...@syzkaller.appspotmail.com

INFO: task syz-executor.3:2435 can't die for more than 143 seconds.
task:syz-executor.3 state:R running task stack:27384 pid: 2435 ppid: 6558 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:4955 [inline]
__schedule+0x940/0x26f0 kernel/sched/core.c:6302
ntfs_collate_names+0x2ca/0x3d0 fs/ntfs/unistr.c:116

Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffffffff8b97fce0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446
1 lock held by systemd-udevd/2972:
1 lock held by in:imklog/6396:
#0: ffff8880703e40f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990
3 locks held by kworker/u4:2/32429:
1 lock held by syz-executor.3/2435:

=============================================

Kernel panic - not syncing: hung_task: blocked tasks
CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.14.0-next-20210910-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
panic+0x2b0/0x6dd kernel/panic.c:232
check_hung_uninterruptible_tasks kernel/hung_task.c:258 [inline]
watchdog.cold+0x1ca/0x1de kernel/hung_task.c:339
kthread+0x3e5/0x4d0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Kernel Offset: disabled
Rebooting in 86400 seconds..


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[syzbot]

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