syzbot


INFO: task hung in lmLogClose (3)

Status: upstream: reported C repro on 2024/03/19 10:13
Subsystems: jfs
[Documentation on labels]
Reported-by: syzbot+c824290332add8067111@syzkaller.appspotmail.com
First crash: 28d, last: 28d
Discussions (2)
Title Replies (including bot) Last reply
[PATCH] jfs: fix task hung in lmLogClose 1 (1) 2024/03/31 08:44
[syzbot] [jfs?] INFO: task hung in lmLogClose (3) 1 (3) 2024/03/31 06:21
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in lmLogClose jfs 1 365d 365d 0/26 auto-obsoleted due to no activity on 2023/07/16 16:14
upstream INFO: task hung in lmLogClose (2) jfs C inconclusive done 5 97d 189d 26/26 fixed on 2024/02/24 00:02
linux-5.15 INFO: task hung in lmLogClose 1 11d 11d 0/3 upstream: reported on 2024/04/05 11:21
Last patch testing requests (1)
Created Duration User Patch Repo Result
2024/03/31 00:09 37m eadavis@qq.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master OK log

Sample crash report:
INFO: task syz-executor394:6204 blocked for more than 143 seconds.
      Not tainted 6.8.0-rc7-syzkaller-g707081b61156 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor394 state:D stack:0     pid:6204  tgid:6204  ppid:6201   flags:0x0000000c
Call trace:
 __switch_to+0x314/0x560 arch/arm64/kernel/process.c:553
 context_switch kernel/sched/core.c:5400 [inline]
 __schedule+0x1498/0x24b4 kernel/sched/core.c:6727
 __schedule_loop kernel/sched/core.c:6802 [inline]
 schedule+0xb8/0x19c kernel/sched/core.c:6817
 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6874
 __mutex_lock_common+0xbd8/0x21a0 kernel/locking/mutex.c:684
 __mutex_lock kernel/locking/mutex.c:752 [inline]
 mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:804
 lmLogClose+0xc8/0x4d4 fs/jfs/jfs_logmgr.c:1444
 jfs_umount+0x274/0x360 fs/jfs/jfs_umount.c:114
 jfs_put_super+0x90/0x188 fs/jfs/super.c:194
 generic_shutdown_super+0x128/0x2b8 fs/super.c:641
 kill_block_super+0x44/0x90 fs/super.c:1675
 deactivate_locked_super+0xc4/0x12c fs/super.c:472
 deactivate_super+0xe0/0x100 fs/super.c:505
 cleanup_mnt+0x34c/0x3dc fs/namespace.c:1267
 __cleanup_mnt+0x20/0x30 fs/namespace.c:1274
 task_work_run+0x230/0x2e0 kernel/task_work.c:180
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 do_notify_resume+0x178/0x1f4 arch/arm64/kernel/entry-common.c:151
 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline]
 el0_svc+0xac/0x168 arch/arm64/kernel/entry-common.c:713
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598
INFO: task syz-executor394:6205 blocked for more than 143 seconds.
      Not tainted 6.8.0-rc7-syzkaller-g707081b61156 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor394 state:D stack:0     pid:6205  tgid:6205  ppid:6201   flags:0x0000000c
Call trace:
 __switch_to+0x314/0x560 arch/arm64/kernel/process.c:553
 context_switch kernel/sched/core.c:5400 [inline]
 __schedule+0x1498/0x24b4 kernel/sched/core.c:6727
 __schedule_loop kernel/sched/core.c:6802 [inline]
 schedule+0xb8/0x19c kernel/sched/core.c:6817
 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6874
 __mutex_lock_common+0xbd8/0x21a0 kernel/locking/mutex.c:684
 __mutex_lock kernel/locking/mutex.c:752 [inline]
 mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:804
 lmLogClose+0xc8/0x4d4 fs/jfs/jfs_logmgr.c:1444
 jfs_umount+0x274/0x360 fs/jfs/jfs_umount.c:114
 jfs_put_super+0x90/0x188 fs/jfs/super.c:194
 generic_shutdown_super+0x128/0x2b8 fs/super.c:641
 kill_block_super+0x44/0x90 fs/super.c:1675
 deactivate_locked_super+0xc4/0x12c fs/super.c:472
 deactivate_super+0xe0/0x100 fs/super.c:505
 cleanup_mnt+0x34c/0x3dc fs/namespace.c:1267
 __cleanup_mnt+0x20/0x30 fs/namespace.c:1274
 task_work_run+0x230/0x2e0 kernel/task_work.c:180
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 do_notify_resume+0x178/0x1f4 arch/arm64/kernel/entry-common.c:151
 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline]
 el0_svc+0xac/0x168 arch/arm64/kernel/entry-common.c:713
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598

Showing all locks held in the system:
1 lock held by khungtaskd/29:
 #0: ffff80008ee74ac0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:297
2 locks held by getty/5927:
 #0: ffff0000d2e810a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340
 #1: ffff800093fe02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x41c/0x1228 drivers/tty/n_tty.c:2201
2 locks held by syz-executor394/6202:
 #0: ffff0000d98900e0 (&type->s_umount_key#42){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff0000d98900e0 (&type->s_umount_key#42){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
 #0: ffff0000d98900e0 (&type->s_umount_key#42){+.+.}-{3:3}, at: deactivate_super+0xd8/0x100 fs/super.c:504
 #1: ffff80008f2586e8 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xc8/0x4d4 fs/jfs/jfs_logmgr.c:1444
1 lock held by syz-executor394/6203:
 #0: ffff0000c25c00e0 (&type->s_umount_key#42){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff0000c25c00e0 (&type->s_umount_key#42){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
 #0: ffff0000c25c00e0 (&type->s_umount_key#42){+.+.}-{3:3}, at: deactivate_super+0xd8/0x100 fs/super.c:504
2 locks held by syz-executor394/6204:
 #0: ffff0000d60740e0 (&type->s_umount_key#42){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff0000d60740e0 (&type->s_umount_key#42){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
 #0: ffff0000d60740e0 (&type->s_umount_key#42){+.+.}-{3:3}, at: deactivate_super+0xd8/0x100 fs/super.c:504
 #1: ffff80008f2586e8 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xc8/0x4d4 fs/jfs/jfs_logmgr.c:1444
2 locks held by syz-executor394/6205:
 #0: ffff0000d95420e0 (&type->s_umount_key#42){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff0000d95420e0 (&type->s_umount_key#42){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
 #0: ffff0000d95420e0 (&type->s_umount_key#42){+.+.}-{3:3}, at: deactivate_super+0xd8/0x100 fs/super.c:504
 #1: ffff80008f2586e8 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xc8/0x4d4 fs/jfs/jfs_logmgr.c:1444
2 locks held by syz-executor394/6206:
 #0: ffff0000d5cb80e0 (&type->s_umount_key#42){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff0000d5cb80e0 (&type->s_umount_key#42){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
 #0: ffff0000d5cb80e0 (&type->s_umount_key#42){+.+.}-{3:3}, at: deactivate_super+0xd8/0x100 fs/super.c:504
 #1: ffff80008f2586e8 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xc8/0x4d4 fs/jfs/jfs_logmgr.c:1444

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


Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/03/19 09:54 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 707081b61156 baa80228 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci-upstream-gce-arm64 INFO: task hung in lmLogClose
2024/03/19 03:22 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 707081b61156 baa80228 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in lmLogClose
* Struck through repros no longer work on HEAD.