syzbot


INFO: task can't die in ntfs_lookup_inode_by_name

Status: auto-closed as invalid on 2022/05/05 23:42
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+0490436a2f55a0e72414@syzkaller.appspotmail.com
First crash: 774d, last: 774d
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in ntfs_lookup_inode_by_name fs 1 227d 227d 0/26 auto-obsoleted due to no activity on 2023/12/04 00:43

Sample crash report:
INFO: task syz-executor.3:12334 can't die for more than 143 seconds.
task:syz-executor.3  state:R  running task     stack:27568 pid:12334 ppid:  3631 flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5043 [inline]
 __schedule+0xa94/0x4910 kernel/sched/core.c:6352
 ntfs_lookup_inode_by_name+0x5e9/0x2ef0 fs/ntfs/dir.c:191
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/28:
 #0: ffffffff8bd858e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6498
2 locks held by getty/3279:
 #0: ffff88801da12098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244
 #1: ffffc90002e562e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2075
1 lock held by syz-executor.3/12334:

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

Kernel panic - not syncing: hung_task: blocked tasks
CPU: 0 PID: 28 Comm: khungtaskd Not tainted 5.17.0-rc6-next-20220303-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 panic+0x2d7/0x636 kernel/panic.c:274
 check_hung_uninterruptible_tasks kernel/hung_task.c:260 [inline]
 watchdog.cold+0x1ca/0x1de kernel/hung_task.c:413
 kthread+0x2e9/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/03/06 23:41 linux-next 91265a6da44d 7bdd8b2c .config console log report info ci-upstream-linux-next-kasan-gce-root INFO: task can't die in ntfs_lookup_inode_by_name
* Struck through repros no longer work on HEAD.