INFO: task syz-executor:8257 blocked for more than 143 seconds. Not tainted 6.15.0-rc6-syzkaller-00047-ge9565e23cd89 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:17576 pid:8257 tgid:8257 ppid:1 task_flags:0x400140 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5382 [inline] __schedule+0x168f/0x4c70 kernel/sched/core.c:6767 __schedule_loop kernel/sched/core.c:6845 [inline] schedule+0x165/0x360 kernel/sched/core.c:6860 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917 __mutex_lock_common kernel/locking/mutex.c:678 [inline] __mutex_lock+0x724/0xe80 kernel/locking/mutex.c:746 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+0x135/0x2c0 fs/super.c:642 kill_block_super+0x44/0x90 fs/super.c:1710 deactivate_locked_super+0xb9/0x130 fs/super.c:473 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1431 task_work_run+0x1d1/0x260 kernel/task_work.c:227 resume_user_mode_work+0x5e/0x80 include/linux/resume_user_mode.h:50 exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x9a/0x120 kernel/entry/common.c:218 do_syscall_64+0x103/0x210 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f83d498fc97 RSP: 002b:00007ffed3c65928 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007f83d4a1089d RCX: 00007f83d498fc97 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffed3c659e0 RBP: 00007ffed3c659e0 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffed3c66a70 R13: 00007f83d4a1089d R14: 000000000004c7be R15: 00007ffed3c66ab0 INFO: task syz-executor:9431 blocked for more than 143 seconds. Not tainted 6.15.0-rc6-syzkaller-00047-ge9565e23cd89 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:21696 pid:9431 tgid:9431 ppid:1 task_flags:0x400140 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5382 [inline] __schedule+0x168f/0x4c70 kernel/sched/core.c:6767 __schedule_loop kernel/sched/core.c:6845 [inline] schedule+0x165/0x360 kernel/sched/core.c:6860 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917 __mutex_lock_common kernel/locking/mutex.c:678 [inline] __mutex_lock+0x724/0xe80 kernel/locking/mutex.c:746 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+0x135/0x2c0 fs/super.c:642 kill_block_super+0x44/0x90 fs/super.c:1710 deactivate_locked_super+0xb9/0x130 fs/super.c:473 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1431 task_work_run+0x1d1/0x260 kernel/task_work.c:227 resume_user_mode_work+0x5e/0x80 include/linux/resume_user_mode.h:50 exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x9a/0x120 kernel/entry/common.c:218 do_syscall_64+0x103/0x210 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ffb1ed8fc97 RSP: 002b:00007ffd6ce852f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007ffb1ee1089d RCX: 00007ffb1ed8fc97 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd6ce853b0 RBP: 00007ffd6ce853b0 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffd6ce86440 R13: 00007ffb1ee1089d R14: 0000000000057de8 R15: 00007ffd6ce86480 Showing all locks held in the system: 1 lock held by khungtaskd/31: #0: ffffffff8df3dce0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8df3dce0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] #0: ffffffff8df3dce0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6764 2 locks held by kworker/u8:2/36: 2 locks held by getty/5577: #0: ffff88803520a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc90002ffe2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222 2 locks held by syz-executor/8257: #0: ffff8880656bc0e0 (&type->s_umount_key#97){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff8880656bc0e0 (&type->s_umount_key#97){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff8880656bc0e0 (&type->s_umount_key#97){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:505 #1: ffffffff8e367aa8 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444 2 locks held by syz-executor/8604: #0: ffff88803f3900e0 (&type->s_umount_key#97){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff88803f3900e0 (&type->s_umount_key#97){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88803f3900e0 (&type->s_umount_key#97){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:505 #1: ffffffff8e367aa8 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444 2 locks held by syz-executor/8627: #0: ffff88804ff060e0 (&type->s_umount_key#97){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff88804ff060e0 (&type->s_umount_key#97){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88804ff060e0 (&type->s_umount_key#97){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:505 #1: ffffffff8e367aa8 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444 2 locks held by syz-executor/8996: #0: ffff888078f9e0e0 (&type->s_umount_key#97){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff888078f9e0e0 (&type->s_umount_key#97){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff888078f9e0e0 (&type->s_umount_key#97){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:505 #1: ffffffff8e367aa8 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444 2 locks held by syz-executor/9168: #0: ffff8880788740e0 (&type->s_umount_key#97){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff8880788740e0 (&type->s_umount_key#97){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff8880788740e0 (&type->s_umount_key#97){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:505 #1: ffffffff8e367aa8 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444 2 locks held by syz-executor/9431: #0: ffff88803b86a0e0 (&type->s_umount_key#97){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff88803b86a0e0 (&type->s_umount_key#97){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88803b86a0e0 (&type->s_umount_key#97){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:505 #1: ffffffff8e367aa8 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444 2 locks held by syz-executor/9662: #0: ffff8880530ae0e0 (&type->s_umount_key#97){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff8880530ae0e0 (&type->s_umount_key#97){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff8880530ae0e0 (&type->s_umount_key#97){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:505 #1: ffffffff8e367aa8 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444 1 lock held by syz.5.462/10560: #0: ffff88804ff060e0 (&type->s_umount_key#97){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff88804ff060e0 (&type->s_umount_key#97){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:120 1 lock held by syz.7.475/10688: #0: ffff8880788740e0 (&type->s_umount_key#97){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff8880788740e0 (&type->s_umount_key#97){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:120 1 lock held by syz.7.475/10705: #0: ffff8880788740e0 (&type->s_umount_key#97){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff8880788740e0 (&type->s_umount_key#97){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:120 2 locks held by syz-executor/10767: #0: ffff8880382660e0 (&type->s_umount_key#97){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff8880382660e0 (&type->s_umount_key#97){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff8880382660e0 (&type->s_umount_key#97){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:505 #1: ffffffff8e367aa8 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444 1 lock held by syz.6.499/10838: #0: ffff888078f9e0e0 (&type->s_umount_key#97){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff888078f9e0e0 (&type->s_umount_key#97){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:120 2 locks held by syz-executor/10954: #0: ffff88807ca960e0 (&type->s_umount_key#97){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff88807ca960e0 (&type->s_umount_key#97){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88807ca960e0 (&type->s_umount_key#97){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:505 #1: ffffffff8e367aa8 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444 1 lock held by syz.8.650/11564: #0: ffff88803b86a0e0 (&type->s_umount_key#97){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff88803b86a0e0 (&type->s_umount_key#97){++++}-{4:4}, at: super_lock+0x25c/0x3b0 fs/super.c:120 1 lock held by syz.0.665/11685: #0: ffff8880530ae0e0 (&type->s_umount_key#97){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff8880530ae0e0 (&type->s_umount_key#97){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:120 2 locks held by dhcpcd/11732: #0: ffff88806a756258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1651 [inline] #0: ffff88806a756258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x32/0xcd0 net/packet/af_packet.c:3252 #1: ffffffff8df437b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:304 [inline] #1: ffffffff8df437b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f4/0x730 kernel/rcu/tree_exp.h:998 2 locks held by dhcpcd/11733: #0: ffff8880376ba258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1651 [inline] #0: ffff8880376ba258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x32/0xcd0 net/packet/af_packet.c:3252 #1: ffffffff8df437b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:336 [inline] #1: ffffffff8df437b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3b7/0x730 kernel/rcu/tree_exp.h:998 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc6-syzkaller-00047-ge9565e23cd89 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:274 [inline] watchdog+0xfee/0x1030 kernel/hung_task.c:437 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 53 Comm: kworker/u8:3 Not tainted 6.15.0-rc6-syzkaller-00047-ge9565e23cd89 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: bat_events batadv_nc_worker RIP: 0010:trace_hardirqs_on+0x23/0x40 kernel/trace/trace_preemptirq.c:78 Code: 90 90 90 90 90 90 90 f3 0f 1e fa 65 8b 05 f5 e7 ab 10 85 c0 74 14 48 8b 3c 24 e8 c8 fe ff ff 65 c7 05 dd e7 ab 10 00 00 00 00 f8 b8 d6 ff 48 8b 3c 24 e9 8f c9 87 09 66 66 66 66 66 66 2e 0f RSP: 0018:ffffc90000be7a18 EFLAGS: 00000002 RAX: 0000000000000001 RBX: ffff888079411701 RCX: 63ec854e395e0c00 RDX: 0000000000000000 RSI: ffffffff8bc104c0 RDI: ffffffff8bc10480 RBP: ffffc90000be7b10 R08: ffffffff8f7dd277 R09: 1ffffffff1efba4e R10: dffffc0000000000 R11: fffffbfff1efba4f R12: 0000000000000200 R13: dffffc0000000000 R14: 0000000002000001 R15: 1ffff9200017cf4c FS: 0000000000000000(0000) GS:ffff8881261fb000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055ecdcf78168 CR3: 0000000032f32000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: queue_delayed_work_on+0x11a/0x280 kernel/workqueue.c:2565 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245