INFO: task jfsCommit:107 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:jfsCommit state:D stack:28272 pid:107 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5245 [inline] __schedule+0x11d1/0x40e0 kernel/sched/core.c:6562 schedule+0xb9/0x180 kernel/sched/core.c:6638 io_schedule+0x7c/0xd0 kernel/sched/core.c:8798 __lock_metapage fs/jfs/jfs_metapage.c:50 [inline] lock_metapage+0x1f5/0x320 fs/jfs/jfs_metapage.c:64 __get_metapage+0x4c6/0xfa0 fs/jfs/jfs_metapage.c:639 diIAGRead+0xce/0x140 fs/jfs/jfs_imap.c:2672 diFree+0x8e1/0x2430 fs/jfs/jfs_imap.c:959 jfs_evict_inode+0x327/0x430 fs/jfs/inode.c:162 evict+0x4c9/0x8d0 fs/inode.c:705 txLazyCommit fs/jfs/jfs_txnmgr.c:2665 [inline] jfs_lazycommit+0x425/0xa70 fs/jfs/jfs_txnmgr.c:2733 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffffffff8cb2df70 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xf00 kernel/rcu/tasks.h:517 1 lock held by rcu_tasks_trace/13: #0: ffffffff8cb2e790 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xf00 kernel/rcu/tasks.h:517 1 lock held by khungtaskd/28: #0: ffffffff8cb2d5e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline] #0: ffffffff8cb2d5e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline] #0: ffffffff8cb2d5e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6513 2 locks held by jfsCommit/107: #0: ffff888070e08920 (&(imap->im_aglock[index])){+.+.}-{3:3}, at: diFree+0x2d6/0x2430 fs/jfs/jfs_imap.c:889 #1: ffff888023631cf8 (&jfs_ip->rdwrlock/1){++++}-{3:3}, at: diFree+0x2f4/0x2430 fs/jfs/jfs_imap.c:894 2 locks held by kworker/1:2/127: 1 lock held by udevd/3639: 2 locks held by getty/4028: #0: ffff88814d89c098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244 #1: ffffc9000327b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x429/0x1390 drivers/tty/n_tty.c:2198 2 locks held by kworker/u4:27/4763: #0: ffff888017479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7b0/0x1160 kernel/workqueue.c:2267 #1: ffffc90003c0fd00 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x7b0/0x1160 kernel/workqueue.c:2267 2 locks held by kworker/u4:34/4777: #0: ffff888017479138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7b0/0x1160 kernel/workqueue.c:2267 #1: ffffc90003717d00 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x7b0/0x1160 kernel/workqueue.c:2267 3 locks held by kworker/1:2H/4981: #0: ffff888017470d38 ((wq_completion)events_highpri){+.+.}-{0:0}, at: process_one_work+0x7b0/0x1160 kernel/workqueue.c:2267 #1: ffffc9000498fd00 ((work_completion)(&vmidi->output_work)){+.+.}-{0:0}, at: process_one_work+0x7b0/0x1160 kernel/workqueue.c:2267 #2: ffff88814d4a70f0 (&grp->list_mutex/1){.+.+}-{3:3}, at: deliver_to_subscribers sound/core/seq/seq_clientmgr.c:683 [inline] #2: ffff88814d4a70f0 (&grp->list_mutex/1){.+.+}-{3:3}, at: snd_seq_deliver_event+0x230/0x8f0 sound/core/seq/seq_clientmgr.c:828 1 lock held by syz-executor/5861: 1 lock held by syz.0.628/8258: 3 locks held by syz.4.629/8257: 1 lock held by syz.4.629/8266: 1 lock held by sed/8271: 1 lock held by modprobe/8279: 1 lock held by syz.7.633/8286: 3 locks held by syz.9.634/8284: 3 locks held by syz.9.634/8287: #0: ffff888075956870 (&fc->uapi_mutex){+.+.}-{3:3}, at: __do_sys_fsconfig fs/fsopen.c:443 [inline] #0: ffff888075956870 (&fc->uapi_mutex){+.+.}-{3:3}, at: __se_sys_fsconfig+0x62b/0x790 fs/fsopen.c:320 #1: ffff888074b340e0 (&type->s_umount_key#38/1){+.+.}-{3:3}, at: alloc_super+0x1fa/0x930 fs/super.c:228 #2: ffffffff8cbac568 (bpf_preload_lock){+.+.}-{3:3}, at: populate_bpffs kernel/bpf/inode.c:718 [inline] #2: ffffffff8cbac568 (bpf_preload_lock){+.+.}-{3:3}, at: bpf_fill_super+0x1ae/0x6f0 kernel/bpf/inode.c:759 1 lock held by syz.9.634/8289: #0: ffff888075956870 (&fc->uapi_mutex){+.+.}-{3:3}, at: __do_sys_fsmount fs/namespace.c:3720 [inline] #0: ffff888075956870 (&fc->uapi_mutex){+.+.}-{3:3}, at: __se_sys_fsmount+0x2a9/0x880 fs/namespace.c:3674 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 28 Comm: khungtaskd Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 nmi_cpu_backtrace+0x3e6/0x460 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x1d4/0x450 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline] watchdog+0xeee/0xf30 kernel/hung_task.c:377 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] NMI backtrace for cpu 0 skipped: idling at default_idle+0xb/0x10 arch/x86/kernel/process.c:741