INFO: task syz-executor:5829 blocked for more than 143 seconds. Not tainted 6.15.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:20840 pid:5829 tgid:5829 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+0x132/0x2c0 fs/super.c:642 kill_block_super+0x44/0x90 fs/super.c:1710 deactivate_locked_super+0xbc/0x130 fs/super.c:473 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1431 task_work_run+0x1d4/0x260 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: 0033:0x7f68a3b8fc97 RSP: 002b:00007ffcad5a5b08 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007f68a3c1089d RCX: 00007f68a3b8fc97 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffcad5a5bc0 RBP: 00007ffcad5a5bc0 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffcad5a6c50 R13: 00007f68a3c1089d R14: 0000000000020d2b R15: 00007ffcad5a6c90 Showing all locks held in the system: 2 locks held by kworker/u8:1/13: #0: ffff8880b88399d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:605 #1: ffff8880b8823b08 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x39e/0x6d0 kernel/sched/psi.c:987 1 lock held by khungtaskd/31: #0: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] #0: ffffffff8df3dee0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6764 5 locks held by kworker/u8:2/36: #0: ffff88801aef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline] #0: ffff88801aef3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 kernel/workqueue.c:3319 #1: ffffc90000ad7c60 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline] #1: ffffc90000ad7c60 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 kernel/workqueue.c:3319 #2: ffffffff8f2dba50 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x145/0xbd0 net/core/net_namespace.c:608 #3: ffff88805ce514e8 (&wg->device_update_lock){+.+.}-{4:4}, at: wg_destruct+0x116/0x2f0 drivers/net/wireguard/device.c:249 #4: ffffffff8df43880 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x570 kernel/rcu/tree.c:3774 2 locks held by getty/5583: #0: ffff88802ffbc0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc9000333b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222 2 locks held by syz-executor/5816: #0: ffff88805c8920e0 (&type->s_umount_key#109){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff88805c8920e0 (&type->s_umount_key#109){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88805c8920e0 (&type->s_umount_key#109){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:505 #1: ffffffff8e36ade8 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444 2 locks held by syz-executor/5829: #0: ffff88805dab40e0 (&type->s_umount_key#109){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff88805dab40e0 (&type->s_umount_key#109){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88805dab40e0 (&type->s_umount_key#109){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:505 #1: ffffffff8e36ade8 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444 2 locks held by syz-executor/6771: #0: ffff8880256200e0 (&type->s_umount_key#109){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff8880256200e0 (&type->s_umount_key#109){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff8880256200e0 (&type->s_umount_key#109){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:505 #1: ffffffff8e36ade8 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444 1 lock held by syz.5.136/6797: #0: ffff88805c8920e0 (&type->s_umount_key#109){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff88805c8920e0 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:120 2 locks held by syz-executor/6836: #0: ffff88807cabc0e0 (&type->s_umount_key#109){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff88807cabc0e0 (&type->s_umount_key#109){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88807cabc0e0 (&type->s_umount_key#109){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:505 #1: ffffffff8e36ade8 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444 2 locks held by syz-executor/6905: #0: ffff8880277380e0 (&type->s_umount_key#109){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff8880277380e0 (&type->s_umount_key#109){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff8880277380e0 (&type->s_umount_key#109){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:505 #1: ffffffff8e36ade8 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1444 1 lock held by syz.1.176/7174: #0: ffff88805c8920e0 (&type->s_umount_key#109){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff88805c8920e0 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:120 1 lock held by syz.1.176/7186: #0: ffff88805c8920e0 (&type->s_umount_key#109){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff88805c8920e0 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:120 1 lock held by syz.0.212/7347: #0: ffff88805c8920e0 (&type->s_umount_key#109){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff88805c8920e0 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:120 1 lock held by syz.3.213/7354: #0: ffff88805dab40e0 (&type->s_umount_key#109){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff88805dab40e0 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:120 1 lock held by syz.6.246/7648: #0: ffff88805c8920e0 (&type->s_umount_key#109){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff88805c8920e0 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:120 1 lock held by syz.5.248/7652: #0: ffff88805c8920e0 (&type->s_umount_key#109){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff88805c8920e0 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:120 1 lock held by syz.1.262/7792: #0: ffff88805c8920e0 (&type->s_umount_key#109){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff88805c8920e0 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:120 1 lock held by syz.4.297/8109: #0: ffff88805c8920e0 (&type->s_umount_key#109){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff88805c8920e0 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:120 1 lock held by syz.2.299/8116: #0: ffff88805c8920e0 (&type->s_umount_key#109){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff88805c8920e0 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:120 1 lock held by syz.8.314/8247: #0: ffff8880277380e0 (&type->s_umount_key#109){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff8880277380e0 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:120 1 lock held by syz.7.315/8251: #0: ffff88807cabc0e0 (&type->s_umount_key#109){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807cabc0e0 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:120 1 lock held by syz.0.333/8564: #0: ffff88805c8920e0 (&type->s_umount_key#109){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff88805c8920e0 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:120 1 lock held by syz.5.426/9295: #0: ffff88805c8920e0 (&type->s_umount_key#109){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff88805c8920e0 (&type->s_umount_key#109){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:120 2 locks held by dhcpcd/9406: #0: ffff88809d76e258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1651 [inline] #0: ffff88809d76e258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x32/0xcd0 net/packet/af_packet.c:3252 #1: ffffffff8df439b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:336 [inline] #1: ffffffff8df439b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3b7/0x730 kernel/rcu/tree_exp.h:998 4 locks held by dhcpcd-run-hook/9430: ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc7-syzkaller #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+0x711/0x8a0 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 8001 Comm: kworker/u8:14 Not tainted 6.15.0-rc7-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: writeback wb_workfn (flush-7:9) RIP: 0010:check_wait_context kernel/locking/lockdep.c:4871 [inline] RIP: 0010:__lock_acquire+0x450/0xd20 kernel/locking/lockdep.c:5185 Code: 44 44 89 e3 81 e3 ff ff ff 7f 83 f9 31 73 1d 48 8d 0c 9b 8b 8c cf 10 0b 00 00 31 c1 41 ff ce 49 ff cc f7 c1 00 60 00 00 74 cf 1c 48 c7 c7 30 f1 e0 8d 48 89 de e8 cf ce 48 03 48 8b 3c 24 41 RSP: 0018:ffffc90000007538 EFLAGS: 00000006 RAX: 00000000000a2007 RBX: 0000000000000002 RCX: 00000000000e29e5 RDX: 0000000000000003 RSI: 0000000000002000 RDI: ffff88802ff7bc00 RBP: ffff88802ff7c6f0 R08: 0000000000000000 R09: 0000000000080000 R10: 0000000000000000 R11: ffffffff8171ca05 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000003 R15: ffff88802ff7c7e0 FS: 0000000000000000(0000) GS:ffff8881260f6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe12c910c8 CR3: 000000000dd38000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:841 [inline] class_rcu_constructor include/linux/rcupdate.h:1155 [inline] unwind_next_frame+0xc2/0x2390 arch/x86/kernel/unwind_orc.c:479 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:47 kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:548 insert_work+0x3d/0x330 kernel/workqueue.c:2183 __queue_work+0xbd9/0xfe0 kernel/workqueue.c:2345 call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1789 expire_timers kernel/time/timer.c:1835 [inline] __run_timers kernel/time/timer.c:2414 [inline] __run_timer_base+0x646/0x860 kernel/time/timer.c:2426 run_timer_base kernel/time/timer.c:2435 [inline] run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2445 handle_softirqs+0x283/0x870 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2061 [inline] RIP: 0010:vprintk_emit+0x58f/0x7a0 kernel/printk/printk.c:2449 Code: 85 32 01 00 00 e8 d1 f2 1e 00 41 89 df 4d 85 f6 48 8b 1c 24 75 07 e8 c0 f2 1e 00 eb 06 e8 b9 f2 1e 00 fb 48 c7 c7 00 21 f3 8d <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 f9 3f RSP: 0018:ffffc9000414e800 EFLAGS: 00000293 RAX: ffffffff81a0fe27 RBX: ffffffff81a0fce4 RCX: ffff88802ff7bc00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8df32100 RBP: ffffc9000414e910 R08: ffffffff8f7e0977 R09: 1ffffffff1efc12e R10: dffffc0000000000 R11: fffffbfff1efc12f R12: dffffc0000000000 R13: 1ffff92000829d04 R14: 0000000000000200 R15: 0000000000000034 _printk+0xcf/0x120 kernel/printk/printk.c:2475 f2fs_printk+0x3d8/0x470 fs/f2fs/super.c:-1 f2fs_write_end_io+0x4e2/0x6d0 fs/f2fs/data.c:353 __submit_merged_bio+0x27a/0x6a0 fs/f2fs/data.c:543 __f2fs_submit_merged_write fs/f2fs/data.c:639 [inline] __submit_merged_write_cond+0x255/0x530 fs/f2fs/data.c:661 f2fs_submit_merged_write_cond fs/f2fs/data.c:678 [inline] f2fs_write_cache_pages fs/f2fs/data.c:3215 [inline] __f2fs_write_data_pages fs/f2fs/data.c:3296 [inline] f2fs_write_data_pages+0x2854/0x31f0 fs/f2fs/data.c:3323 do_writepages+0x3b1/0x7b0 mm/page-writeback.c:2656 __writeback_single_inode+0x145/0xff0 fs/fs-writeback.c:1680 writeback_sb_inodes+0x6b5/0x1000 fs/fs-writeback.c:1976 wb_writeback+0x43b/0xaf0 fs/fs-writeback.c:2156 wb_do_writeback fs/fs-writeback.c:2303 [inline] wb_workfn+0x409/0xef0 fs/fs-writeback.c:2343 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xade/0x17a0 kernel/workqueue.c:3319 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 kthread+0x711/0x8a0 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