INFO: task syz-executor252:3614 blocked for more than 143 seconds.
Not tainted 6.0.0-rc4-syzkaller-00302-gb96fbd602d35 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor252 state:D stack:25856 pid: 3614 ppid: 3613 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5182 [inline]
__schedule+0x957/0xe20 kernel/sched/core.c:6494
schedule+0xcb/0x190 kernel/sched/core.c:6570
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6629
__mutex_lock_common+0xecf/0x26c0 kernel/locking/mutex.c:679
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:799
blkdev_put+0x100/0x730 block/bdev.c:910
blkdev_close+0x55/0x80 block/fops.c:499
__fput+0x3b9/0x820 fs/file_table.c:320
task_work_run+0x146/0x1c0 kernel/task_work.c:177
exit_task_work include/linux/task_work.h:38 [inline]
do_exit+0x55e/0x20a0 kernel/exit.c:795
do_group_exit+0x23b/0x2f0 kernel/exit.c:925
get_signal+0x172f/0x1780 kernel/signal.c:2857
arch_do_signal_or_restart+0x8d/0x750 arch/x86/kernel/signal.c:869
exit_to_user_mode_loop+0x74/0x160 kernel/entry/common.c:166
exit_to_user_mode_prepare+0xad/0x110 kernel/entry/common.c:201
__syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
syscall_exit_to_user_mode+0x2e/0x60 kernel/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f9da55666a9
RSP: 002b:00007ffc9fcc0948 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: fffffffffffffe00 RBX: 0000000000000000 RCX: 00007f9da55666a9
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000006
RBP: 0000000000000000 R08: 00007ffc9fcc0ae8 R09: 00007ffc9fcc0ae8
R10: 000000000000ffff R11: 0000000000000246 R12: 00007f9da5525730
R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000
Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
#0: ffffffff8cd20a70 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x30/0xd00 kernel/rcu/tasks.h:507
1 lock held by rcu_tasks_trace/13:
#0: ffffffff8cd21270 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x30/0xd00 kernel/rcu/tasks.h:507
1 lock held by khungtaskd/28:
#0: ffffffff8cd208a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by getty/3285:
#0: ffff8880278a9098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
#1: ffffc90002d232f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6e8/0x1e50 drivers/tty/n_tty.c:2177
1 lock held by syz-executor252/3614:
#0: ffff8881474fd4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0x100/0x730 block/bdev.c:910
1 lock held by udevd/3616:
#0: ffff8881474fd4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0xfd/0xa40 block/bdev.c:812
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.0.0-rc4-syzkaller-00302-gb96fbd602d35 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
nmi_cpu_backtrace+0x47c/0x4b0 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x169/0x280 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
watchdog+0xcd5/0xd20 kernel/hung_task.c:369
kthread+0x266/0x300 kernel/kthread.c:376
ret_from_fork+0x1f/0x30
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 11 Comm: kworker/u4:1 Not tainted 6.0.0-rc4-syzkaller-00302-gb96fbd602d35 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:hlock_class kernel/locking/lockdep.c:227 [inline]
RIP: 0010:lookup_chain_cache_add kernel/locking/lockdep.c:3741 [inline]
RIP: 0010:validate_chain+0x12e/0x6600 kernel/locking/lockdep.c:3797
Code: 04 00 00 81 e3 ff 1f 00 00 48 89 d8 48 c1 e8 06 48 8d 3c c5 40 20 fa 8f be 08 00 00 00 e8 fa 39 73 00 48 0f a3 1d 42 14 90 0e <72> 24 48 c7 c0 40 9f 79 91 48 c1 e8 03 42 8a 04 20 84 c0 0f 85 8c
RSP: 0018:ffffc900001071c0 EFLAGS: 00000057
RAX: 0000000000000001 RBX: 0000000000000091 RCX: ffffffff816a0bf6
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8ffa2050
RBP: ffffc900001074f8 R08: dffffc0000000000 R09: fffffbfff1ff440b
R10: fffffbfff1ff440b R11: 1ffffffff1ff440a R12: dffffc0000000000
R13: ffff88801224bb00 R14: 4995a43c3fc7b31e R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055bf1b372600 CR3: 000000000ca8e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__lock_acquire+0x1292/0x1f60 kernel/locking/lockdep.c:5053
lock_acquire+0x1a7/0x400 kernel/locking/lockdep.c:5666
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
spin_lock include/linux/spinlock.h:349 [inline]
__get_locked_pte+0x169/0x1c0 mm/memory.c:1838
get_locked_pte include/linux/mm.h:2089 [inline]
__text_poke+0x272/0x9d0 arch/x86/kernel/alternative.c:1123
text_poke arch/x86/kernel/alternative.c:1208 [inline]
text_poke_bp_batch+0x49e/0x970 arch/x86/kernel/alternative.c:1503
text_poke_flush arch/x86/kernel/alternative.c:1660 [inline]
text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1667
arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146
static_key_disable_cpuslocked+0xc8/0x1b0 kernel/jump_label.c:207
static_key_disable+0x16/0x20 kernel/jump_label.c:215
toggle_allocation_gate+0x3d8/0x470 mm/kfence/core.c:825
process_one_work+0x81c/0xd10 kernel/workqueue.c:2289
worker_thread+0xb14/0x1330 kernel/workqueue.c:2436
kthread+0x266/0x300 kernel/kthread.c:376
ret_from_fork+0x1f/0x30
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.222 msecs