INFO: task syz-executor:9076 blocked for more than 144 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:21736 pid:9076 ppid:1 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5381 [inline] __schedule+0x1553/0x45a0 kernel/sched/core.c:6700 schedule+0xbd/0x170 kernel/sched/core.c:6774 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6833 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0x6a9/0xcc0 kernel/locking/mutex.c:747 lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444 jfs_umount+0x2ef/0x3c0 fs/jfs/jfs_umount.c:114 jfs_put_super+0x8c/0x190 fs/jfs/super.c:194 generic_shutdown_super+0x134/0x2b0 fs/super.c:693 kill_block_super+0x44/0x90 fs/super.c:1660 deactivate_locked_super+0x97/0x100 fs/super.c:481 cleanup_mnt+0x43b/0x4d0 fs/namespace.c:1259 task_work_run+0x1d4/0x260 kernel/task_work.c:245 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302 do_syscall_64+0x61/0xa0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fec49f9da57 RSP: 002b:00007ffd7638abd8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007fec4a032048 RCX: 00007fec49f9da57 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd7638ac90 RBP: 00007ffd7638ac90 R08: 00007ffd7638bc90 R09: 00000000ffffffff R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd7638bd20 R13: 00007fec4a032048 R14: 0000000000064b8e R15: 00007ffd7638bd60 Showing all locks held in the system: 3 locks held by kworker/1:1/27: 1 lock held by khungtaskd/29: #0: ffffffff8d1320a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline] #0: ffffffff8d1320a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline] #0: ffffffff8d1320a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6633 3 locks held by kworker/u4:7/1086: 2 locks held by getty/5531: #0: ffff8880314920a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc9000326e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x433/0x1390 drivers/tty/n_tty.c:2217 2 locks held by syz-executor/5773: #0: ffff88801d7960e0 (&type->s_umount_key#64){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff88801d7960e0 (&type->s_umount_key#64){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88801d7960e0 (&type->s_umount_key#64){+.+.}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:513 #1: ffffffff8d54a068 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444 2 locks held by syz-executor/9076: #0: ffff888077f740e0 (&type->s_umount_key#64){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff888077f740e0 (&type->s_umount_key#64){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff888077f740e0 (&type->s_umount_key#64){+.+.}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:513 #1: ffffffff8d54a068 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444 2 locks held by syz-executor/9236: #0: ffff8880270600e0 (&type->s_umount_key#64){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff8880270600e0 (&type->s_umount_key#64){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff8880270600e0 (&type->s_umount_key#64){+.+.}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:513 #1: ffffffff8d54a068 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444 2 locks held by syz-executor/9319: #0: ffff88807ecb80e0 (&type->s_umount_key#64){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff88807ecb80e0 (&type->s_umount_key#64){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88807ecb80e0 (&type->s_umount_key#64){+.+.}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:513 #1: ffffffff8d54a068 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444 2 locks held by kworker/1:5/9994: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 29 Comm: khungtaskd Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call Trace: dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106 nmi_cpu_backtrace+0x3a6/0x3e0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x17a/0x2f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline] watchdog+0xf3d/0xf80 kernel/hung_task.c:379 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 9994 Comm: kworker/1:5 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Workqueue: events_power_efficient gc_worker RIP: 0010:rcu_dynticks_curr_cpu_in_eqs include/linux/context_tracking.h:122 [inline] RIP: 0010:rcu_is_watching+0x6c/0xb0 kernel/rcu/tree.c:700 Code: 6e 00 48 c7 c3 28 6b 03 00 49 03 1e 48 89 d8 48 c1 e8 03 42 0f b6 04 38 84 c0 75 2f 8b 03 65 ff 0d 81 d0 92 7e 74 0c 83 e0 04 e8 02 5b 41 5e 41 5f c3 e8 26 b8 8f ff eb ed 48 c7 c7 40 7c 13 RSP: 0018:ffffc90005437968 EFLAGS: 00000002 RAX: 0000000000000004 RBX: ffff8880b8f36b28 RCX: b3106bf8d8495900 RDX: 0000000000000000 RSI: ffffffff8b1c8e40 RDI: ffffffff8b1c8e00 RBP: ffffc90005437a50 R08: ffffffff8e8b14ef R09: 1ffffffff1d1629d R10: dffffc0000000000 R11: fffffbfff1d1629e R12: 0000000000000200 R13: dffffc0000000000 R14: ffffffff8ca77a38 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005647d02c2138 CR3: 000000000cf32000 CR4: 00000000003506e0 Call Trace: trace_irq_disable+0x37/0xe0 include/trace/events/preemptirq.h:36 seqcount_lockdep_reader_access+0xf0/0x1d0 include/linux/seqlock.h:101 nf_conntrack_get_ht include/net/netfilter/nf_conntrack.h:350 [inline] gc_worker+0x317/0x1490 net/netfilter/nf_conntrack_core.c:1504 process_one_work kernel/workqueue.c:2653 [inline] process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293