INFO: task jfsCommit:108 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:26408 pid:108 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5244 [inline] __schedule+0x10ec/0x40b0 kernel/sched/core.c:6561 schedule+0xb9/0x180 kernel/sched/core.c:6637 io_schedule+0x7c/0xd0 kernel/sched/core.c:8797 __lock_metapage fs/jfs/jfs_metapage.c:50 [inline] lock_metapage+0x1e8/0x310 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+0x898/0x2460 fs/jfs/jfs_imap.c:959 jfs_evict_inode+0x327/0x430 fs/jfs/inode.c:156 evict+0x485/0x870 fs/inode.c:705 txLazyCommit fs/jfs/jfs_txnmgr.c:2664 [inline] jfs_lazycommit+0x427/0xa50 fs/jfs/jfs_txnmgr.c:2732 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: ffffffff8cb2b630 (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: ffffffff8cb2be50 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x33/0xf00 kernel/rcu/tasks.h:517 2 locks held by kworker/0:1/14: #0: ffff888017472138 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267 #1: ffffc90000137d00 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267 1 lock held by khungtaskd/28: #0: ffffffff8cb2aca0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline] #0: ffffffff8cb2aca0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline] #0: ffffffff8cb2aca0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6513 2 locks held by jfsCommit/108: #0: ffff888054bd8920 (&(imap->im_aglock[index])){+.+.}-{3:3}, at: diFree+0x2a4/0x2460 fs/jfs/jfs_imap.c:889 #1: ffff888070118a78 (&jfs_ip->rdwrlock/1){.+.+}-{3:3}, at: diFree+0x2c2/0x2460 fs/jfs/jfs_imap.c:894 2 locks held by getty/4027: #0: ffff88803019a098 (&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+0x41b/0x1380 drivers/tty/n_tty.c:2198 4 locks held by kworker/u4:8/4413: #0: ffff888017616938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267 #1: ffffc90004857d00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267 #2: ffffffff8dd34a10 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x132/0xb80 net/core/net_namespace.c:594 #3: ffffffff8cb30840 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x48/0x600 kernel/rcu/tree.c:4023 2 locks held by kworker/u4:16/4649: 6 locks held by kworker/1:14/4845: #0: ffff888141ecc938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267 #1: ffffc9000c56fd00 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x7a1/0x1160 kernel/workqueue.c:2267 #2: ffff888144fc0190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:840 [inline] #2: ffff888144fc0190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1a7/0x54e0 drivers/usb/core/hub.c:5845 #3: ffff88801fa9c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:840 [inline] #3: ffff88801fa9c190 (&dev->mutex){....}-{3:3}, at: __device_attach+0x85/0x460 drivers/base/dd.c:990 #4: ffff888056a1b118 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:840 [inline] #4: ffff888056a1b118 (&dev->mutex){....}-{3:3}, at: __device_attach+0x85/0x460 drivers/base/dd.c:990 #5: ffffffff8c9d7850 (umhelper_sem){++++}-{3:3}, at: usermodehelper_read_trylock+0xec/0x2a0 kernel/umh.c:218 5 locks held by syz.9.577/7666: #0: ffff888079794460 (sb_writers#23){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:402 #1: ffff88807011f480 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff88807011f480 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: open_last_lookups fs/namei.c:3555 [inline] #1: ffff88807011f480 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: path_openat+0x7c2/0x2e70 fs/namei.c:3788 #2: ffff88807011f0c8 (&jfs_ip->commit_mutex){+.+.}-{3:3}, at: jfs_create+0x1ef/0xa50 fs/jfs/namei.c:100 #3: ffff88807011c288 (&jfs_ip->commit_mutex/1){+.+.}-{3:3}, at: jfs_create+0x20a/0xa50 fs/jfs/namei.c:101 #4: ffff888070118a78 (&jfs_ip->rdwrlock#2/2){++++}-{3:3}, at: dbAlloc+0x58b/0xb90 fs/jfs/jfs_dmap.c:872 2 locks held by syz.9.577/7696: #0: ffff888079794460 (sb_writers#23){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:402 #1: ffff88807011f480 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff88807011f480 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: open_last_lookups fs/namei.c:3555 [inline] #1: ffff88807011f480 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: path_openat+0x7c2/0x2e70 fs/namei.c:3788 2 locks held by syz.9.577/7699: #0: ffff888079794460 (sb_writers#23){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:402 #1: ffff88807011f480 (&type->i_mutex_dir_key#17/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline] #1: ffff88807011f480 (&type->i_mutex_dir_key#17/1){+.+.}-{3:3}, at: filename_create+0x1f2/0x450 fs/namei.c:3884 2 locks held by syz.9.577/7705: #0: ffff888079794460 (sb_writers#23){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:402 #1: ffff88807011f480 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff88807011f480 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: open_last_lookups fs/namei.c:3555 [inline] #1: ffff88807011f480 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: path_openat+0x7c2/0x2e70 fs/namei.c:3788 2 locks held by syz.9.577/7725: #0: ffff888079794460 (sb_writers#23){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:402 #1: ffff88807011f480 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff88807011f480 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: open_last_lookups fs/namei.c:3555 [inline] #1: ffff88807011f480 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: path_openat+0x7c2/0x2e70 fs/namei.c:3788 2 locks held by syz.9.577/7726: #0: ffff888079794460 (sb_writers#23){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:402 #1: ffff88807011f480 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff88807011f480 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: open_last_lookups fs/namei.c:3555 [inline] #1: ffff88807011f480 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: path_openat+0x7c2/0x2e70 fs/namei.c:3788 2 locks held by syz.9.577/7749: #0: ffff888079794460 (sb_writers#23){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:402 #1: ffff88807011f480 (&type->i_mutex_dir_key#17/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline] #1: ffff88807011f480 (&type->i_mutex_dir_key#17/1){+.+.}-{3:3}, at: filename_create+0x1f2/0x450 fs/namei.c:3884 1 lock held by syz.9.577/7750: #0: ffff88807011f480 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:768 [inline] #0: ffff88807011f480 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1714 1 lock held by syz.3.729/8535: 2 locks held by syz.2.731/8555: #0: ffffffff8c9e9248 (sched_core_mutex){+.+.}-{3:3}, at: sched_core_get+0x49/0x1c0 kernel/sched/core.c:398 #1: ffffffff8cb30978 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:291 [inline] #1: ffffffff8cb30978 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x455/0x830 kernel/rcu/tree_exp.h:962 ============================================= 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 10/02/2025 Call Trace: dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106 nmi_cpu_backtrace+0x3f4/0x470 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