INFO: task syz-executor191:3597 blocked for more than 143 seconds.
Not tainted 6.1.56-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor191 state:D stack:26480 pid:3597 ppid:3581 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5241 [inline]
__schedule+0x142d/0x4550 kernel/sched/core.c:6554
schedule+0xbf/0x180 kernel/sched/core.c:6630
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6689
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
blkdev_put+0x100/0x750 block/bdev.c:911
blkdev_close+0x56/0x80 block/fops.c:514
__fput+0x3b7/0x890 fs/file_table.c:320
task_work_run+0x246/0x300 kernel/task_work.c:179
get_signal+0x15fc/0x17d0 kernel/signal.c:2639
arch_do_signal_or_restart+0xb0/0x1a10 arch/x86/kernel/signal.c:871
exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:168
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204
__syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:297
do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f8d3fedf4b9
RSP: 002b:00007f8d3fe9d228 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 00007f8d3ff66328 RCX: 00007f8d3fedf4b9
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003
RBP: 00007f8d3ff66320 R08: 00007f8d3fe9d6c0 R09: 00007f8d3fe9d6c0
R10: 00007f8d3fe9d6c0 R11: 0000000000000246 R12: 00007f8d3ff6632c
R13: 00007f8d3ff331a4 R14: 64626e2f7665642f R15: 00007fff81ef6a68
Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
#0: ffffffff8d12a170 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:516
1 lock held by rcu_tasks_trace/13:
#0: ffffffff8d12a970 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:516
1 lock held by khungtaskd/28:
#0: ffffffff8d129fa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:306 [inline]
#0: ffffffff8d129fa0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]
#0: ffffffff8d129fa0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6493
2 locks held by getty/3310:
#0: ffff88814b978098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
#1: ffffc900031262f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a7/0x1db0 drivers/tty/n_tty.c:2188
1 lock held by udevd/3585:
#0: ffff88801fa074c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x148/0xa10 block/bdev.c:813
1 lock held by syz-executor191/3597:
#0: ffff88801fa074c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0x100/0x750 block/bdev.c:911
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.1.56-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
nmi_cpu_backtrace+0x4e1/0x560 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x1b0/0x3f0 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+0xf88/0xfd0 kernel/hung_task.c:377
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 46 Comm: kworker/u4:3 Not tainted 6.1.56-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:hlock_class kernel/locking/lockdep.c:228 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4722 [inline]
RIP: 0010:__lock_acquire+0x49d/0x1f80 kernel/locking/lockdep.c:4998
Code: 12 00 00 44 89 33 44 89 fb 48 89 d8 48 c1 e8 06 48 8d 3c c5 20 82 49 90 be 08 00 00 00 e8 3b 57 77 00 48 0f a3 1d 13 3f df 0e <73> 25 48 8d 04 5b 48 c1 e0 06 48 8d 98 20 e1 18 90 48 ba 00 00 00
RSP: 0018:ffffc90000007940 EFLAGS: 00000057
RAX: 0000000000000001 RBX: 00000000000000b5 RCX: ffffffff816a4305
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff90498230
RBP: ffff888012750ac4 R08: dffffc0000000000 R09: fffffbfff2093047
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888012750ad8
R13: ffff888012750000 R14: 0000000000000000 R15: 00000000000000b5
FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055605d910b98 CR3: 000000000ce8e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5661
call_timer_fn+0xdf/0x6b0 kernel/time/timer.c:1471
expire_timers kernel/time/timer.c:1519 [inline]
__run_timers+0x67c/0x890 kernel/time/timer.c:1790
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1803
__do_softirq+0x2e9/0xa4c kernel/softirq.c:571
invoke_softirq kernel/softirq.c:445 [inline]
__irq_exit_rcu+0x155/0x240 kernel/softirq.c:650
irq_exit_rcu+0x5/0x20 kernel/softirq.c:662
sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1106
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:insn_get_prefixes+0x94f/0x18a0
Code: 00 00 e8 94 d8 03 f7 48 8b 6c 24 10 49 be 00 00 00 00 00 fc ff df 43 0f b6 04 34 84 c0 4c 8b 3c 24 0f 85 7d 0c 00 00 88 5d 00 <4c> 8b 64 24 18 49 8d 5f 53 48 89 d8 48 c1 e8 03 48 89 44 24 10 42
RSP: 0018:ffffc90000b77640 EFLAGS: 00000293
RAX: ffffffff8a8693a8 RBX: 00000000000000e9 RCX: ffff888012750000
RDX: 0000000000000000 RSI: 00000000fffffff4 RDI: 00000000fffffff5
RBP: 00000000fffffff4 R08: ffffffff8a86939e R09: ffffc90000b77980
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: ffffffff81e0b21a R14: dffffc0000000000 R15: ffffc90000b77980
insn_get_opcode+0x1ae/0xa50 arch/x86/lib/insn.c:272
insn_get_modrm+0x22a/0x790 arch/x86/lib/insn.c:343
insn_get_sib arch/x86/lib/insn.c:421 [inline]
insn_get_displacement+0x13a/0x970 arch/x86/lib/insn.c:464
insn_get_immediate+0x458/0x1390 arch/x86/lib/insn.c:632
insn_get_length arch/x86/lib/insn.c:707 [inline]
insn_decode+0x36c/0x500 arch/x86/lib/insn.c:747
arch_jump_entry_size arch/x86/kernel/jump_label.c:24 [inline]
__jump_label_patch+0xe4/0x440 arch/x86/kernel/jump_label.c:45
arch_jump_label_transform_queue+0x4a/0xd0 arch/x86/kernel/jump_label.c:137
__jump_label_update+0x177/0x3a0 kernel/jump_label.c:447
static_key_disable_cpuslocked+0xca/0x1b0 kernel/jump_label.c:207
static_key_disable+0x16/0x20 kernel/jump_label.c:215
toggle_allocation_gate+0x3e0/0x480 mm/kfence/core.c:818
process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 2.507 msecs