INFO: task syz-executor.0:5165 blocked for more than 143 seconds. Not tainted 6.7.0-rc1-next-20231114-syzkaller-01346-g5ba73bec5e7b #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:27616 pid:5165 tgid:5164 ppid:5140 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5376 [inline] __schedule+0xede/0x5b00 kernel/sched/core.c:6688 __schedule_loop kernel/sched/core.c:6763 [inline] schedule+0xe7/0x270 kernel/sched/core.c:6778 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6835 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0x5b4/0x9c0 kernel/locking/mutex.c:747 bdev_release+0xcd/0xa90 block/bdev.c:965 blkdev_release+0x37/0x50 block/fops.c:616 __fput+0x270/0xbb0 fs/file_table.c:394 task_work_run+0x14c/0x240 kernel/task_work.c:180 get_signal+0x105a/0x2770 kernel/signal.c:2678 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:309 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11e/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1e/0x60 kernel/entry/common.c:296 do_syscall_64+0x4d/0x110 arch/x86/entry/common.c:88 entry_SYSCALL_64_after_hwframe+0x62/0x6a RIP: 0033:0x4551e9 RSP: 002b:00007fd03db160d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: 0000000000000000 RBX: 000000000054cf00 RCX: 00000000004551e9 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003 RBP: 00000000004a06fd R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000049f8fd R13: 000000000000000b R14: 000000000054cf00 R15: 00007ffcbd983738 Showing all locks held in the system: 1 lock held by khungtaskd/29: #0: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline] #0: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline] #0: ffffffff8cfad060 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6613 5 locks held by kworker/u4:8/2415: 2 locks held by getty/4815: #0: ffff88814b13c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc4/0x1490 drivers/tty/n_tty.c:2201 1 lock held by udevd/5129: #0: ffff88801d4504c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open_by_dev+0x27c/0xed0 block/bdev.c:855 1 lock held by syz-executor.0/5165: #0: ffff88801d4504c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_release+0xcd/0xa90 block/bdev.c:965 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.7.0-rc1-next-20231114-syzkaller-01346-g5ba73bec5e7b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x277/0x390 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x299/0x300 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+0xf86/0x1210 kernel/hung_task.c:379 kthread+0x2c1/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 77 Comm: kworker/u4:5 Not tainted 6.7.0-rc1-next-20231114-syzkaller-01346-g5ba73bec5e7b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:26 [inline] RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:67 [inline] RIP: 0010:check_preemption_disabled+0x28/0xe0 lib/smp_processor_id.c:19 Code: 1f 00 41 54 55 53 48 83 ec 08 65 8b 1d 8d 3e 82 75 65 8b 05 82 3e 82 75 a9 ff ff ff 7f 74 0b 48 83 c4 08 89 d8 5b 5d 41 5c c3 <9c> 58 f6 c4 02 74 ee 65 48 8b 05 59 3e 82 75 f6 40 2f 04 48 89 fd RSP: 0018:ffffc900015f7ae8 EFLAGS: 00000046 RAX: 0000000080000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8accc340 RDI: ffffffff8b2f14a0 RBP: 0000000000000246 R08: 0000000000000000 R09: fffffbfff1e31c6a R10: ffffffff8f18e357 R11: 0000000000000000 R12: 0000000000000001 R13: 0000000000000000 R14: ffffffff8ce51f70 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005580f6823038 CR3: 000000000cd78000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lockdep_recursion_inc kernel/locking/lockdep.c:462 [inline] lock_acquire kernel/locking/lockdep.c:5752 [inline] lock_acquire+0x172/0x530 kernel/locking/lockdep.c:5718 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] cpus_read_lock+0x42/0x160 kernel/cpu.c:489 static_key_disable+0x12/0x20 kernel/jump_label.c:242 toggle_allocation_gate mm/kfence/core.c:835 [inline] toggle_allocation_gate+0x13f/0x250 mm/kfence/core.c:822 process_one_work+0x8a4/0x15f0 kernel/workqueue.c:2636 process_scheduled_works kernel/workqueue.c:2709 [inline] worker_thread+0x8b6/0x1290 kernel/workqueue.c:2790 kthread+0x2c1/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242