INFO: task syz.4.17660:11610 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.17660     state:D stack:24872 pid:11610 tgid:11610 ppid:5607   task_flags:0x400040 flags:0x00080003
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x16dc/0x5500 kernel/sched/core.c:7234
 __schedule_loop kernel/sched/core.c:7311 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7326
 request_wait_answer fs/fuse/dev.c:743 [inline]
 __fuse_request_send fs/fuse/dev.c:757 [inline]
 fuse_chan_send+0x1068/0x1ad0 fs/fuse/dev.c:833
 fuse_simple_request fs/fuse/fuse_i.h:1012 [inline]
 fuse_flush+0x677/0x8b0 fs/fuse/file.c:504
 filp_flush+0xc0/0x190 fs/open.c:1471
 filp_close+0x1d/0x40 fs/open.c:1484
 __range_close fs/file.c:793 [inline]
 __do_sys_close_range fs/file.c:854 [inline]
 __se_sys_close_range+0x3d6/0x910 fs/file.c:818
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2ba3b6ce59
RSP: 002b:00007fff68fc11f8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: ffffffffffffffda RBX: 00007f2ba3de7da0 RCX: 00007f2ba3b6ce59
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f2ba3de7da0 R08: 0000000000000006 R09: 0000000000000000
R10: 00007f2ba3de7cb0 R11: 0000000000000246 R12: 00000000001670d2
R13: 00007f2ba3de5fac R14: 0000000000166e71 R15: 00007fff68fc1300
 </TASK>

Showing all locks held in the system:
4 locks held by kworker/0:1/11:
6 locks held by kworker/u8:0/12:
11 locks held by ktimers/0/16:
1 lock held by khungtaskd/38:
 #0: ffffffff8dfc2fc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #0: ffffffff8dfc2fc0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
 #0: ffffffff8dfc2fc0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5349:
 #0: ffff888032c8e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc90003cc62e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x460/0x1360 drivers/tty/n_tty.c:2211
4 locks held by syz-executor/11110:
9 locks held by kworker/u8:2/2543:
10 locks held by kworker/u8:10/5379:
6 locks held by kworker/u8:20/5394:
6 locks held by kworker/u8:26/11495:
5 locks held by kworker/u8:30/11499:
7 locks held by kworker/u8:41/13381:
4 locks held by kworker/u8:47/13388:
4 locks held by kworker/u8:48/13389:
 #0: ffff88801a084138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
 #0: ffff88801a084138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
 #1: ffffc9000c57fc40 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
 #1: ffffc9000c57fc40 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
 #2: ffffffff8f3716b8 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:313
 #3: ffffffff8dfc2fc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #3: ffffffff8dfc2fc0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
 #3: ffffffff8dfc2fc0 (rcu_read_lock){....}-{1:3}, at: rtmutex_spin_on_owner kernel/locking/rtmutex.c:1501 [inline]
 #3: ffffffff8dfc2fc0 (rcu_read_lock){....}-{1:3}, at: rt_mutex_slowlock_block+0x33a/0x680 kernel/locking/rtmutex.c:1668
3 locks held by syz-executor/14112:
6 locks held by syz.6.18668/14345:
1 lock held by syz.3.18689/14418:

=============================================

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 38 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:122
 nmi_trigger_cpumask_backtrace+0x17a/0x380 lib/nmi_backtrace.c:65
 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
 __sys_info lib/sys_info.c:157 [inline]
 sys_info+0x135/0x170 lib/sys_info.c:165
 check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
 watchdog+0xfd7/0x1030 kernel/hung_task.c:561
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 16 Comm: ktimers/0 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:__bfs kernel/locking/lockdep.c:1815 [inline]
RIP: 0010:__bfs_backwards kernel/locking/lockdep.c:1860 [inline]
RIP: 0010:check_irq_usage kernel/locking/lockdep.c:2796 [inline]
RIP: 0010:check_prev_add kernel/locking/lockdep.c:3169 [inline]
RIP: 0010:check_prevs_add kernel/locking/lockdep.c:3284 [inline]
RIP: 0010:validate_chain kernel/locking/lockdep.c:3908 [inline]
RIP: 0010:__lock_acquire+0x18fa/0x2ce0 kernel/locking/lockdep.c:5237
Code: 13 25 ff 0f 00 00 39 05 b0 d6 d7 11 73 06 89 05 a8 d6 d7 11 48 8b 02 48 89 df 4c 39 e8 0f 84 34 fe ff ff 4c 89 78 30 48 8b 00 <4c> 39 e8 75 f4 48 89 df e9 20 fe ff ff 48 89 fb 48 c7 c7 b0 02 e9
RSP: 0000:ffffc90000157028 EFLAGS: 00000002
RAX: ffffffff9609d548 RBX: 00000000000003cd RCX: 00000000000009a2
RDX: ffffffff95fc8058 RSI: ffff88801ceb0dc0 RDI: 00000000000003cd
RBP: f87c699a372c8cc8 R08: ffffc90000156ff0 R09: 0000000000000020
R10: 0000000000000000 R11: ffffffff81a124a0 R12: 00000000000009a1
R13: ffffffff931a2778 R14: ffff88801ceb0000 R15: ffffffff96126e58
FS:  0000000000000000(0000) GS:ffff888126111000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f52b6b474d9 CR3: 0000000071258000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
 seqcount_lockdep_reader_access+0x55/0x100 include/linux/seqlock.h:73
 ktime_expiry_to_cycles+0x4e/0x1e0 kernel/time/timekeeping.c:910
 clockevent_set_next_coupled kernel/time/clockevents.c:314 [inline]
 clockevents_program_event+0x199/0x630 kernel/time/clockevents.c:360
 hrtimer_rearm kernel/time/hrtimer.c:2141 [inline]
 __hrtimer_rearm_deferred+0x26f/0x430 kernel/time/hrtimer.c:2161
 hrtimer_rearm_deferred_tif include/linux/hrtimer_rearm.h:53 [inline]
 hrtimer_rearm_deferred include/linux/hrtimer_rearm.h:62 [inline]
 irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:505 [inline]
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:542 [inline]
 irqentry_exit+0x8b7/0x8f0 kernel/entry/common.c:167
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:198
Code: f7 e8 2d 71 76 f6 f7 c3 00 02 00 00 74 05 e8 90 65 a2 f6 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 74 90 68 f6 65 8b 05 ad ed 45 07 85 c0 74 18 5b 41 5e e9 51 3c
RSP: 0000:ffffc90000157488 EFLAGS: 00000206
RAX: 0000000000000006 RBX: 0000000000000206 RCX: 0000000080000003
RDX: 0000000000000002 RSI: ffffffff8d6401ff RDI: 0000000000000001
RBP: dffffc0000000000 R08: ffffffff8f8afef7 R09: 1ffffffff1f15fde
R10: dffffc0000000000 R11: fffffbfff1f15fdf R12: ffff8880b883c7a0
R13: 1ffff110171078f4 R14: ffff8880297da9e0 R15: ffff8880b883b908
 class_raw_spinlock_irqsave_destructor include/linux/spinlock.h:573 [inline]
 try_to_wake_up+0x81c/0x1430 kernel/sched/core.c:4292
 rt_mutex_wake_up_q kernel/locking/rtmutex.c:574 [inline]
 rt_mutex_slowunlock+0x5ff/0xa20 kernel/locking/rtmutex.c:1483
 rt_spin_unlock+0x10d/0x200 kernel/locking/spinlock_rt.c:84
 spin_unlock include/linux/spinlock_rt.h:109 [inline]
 crng_make_state+0x22f/0x5d0 drivers/char/random.c:383
 _get_random_bytes+0xff/0x260 drivers/char/random.c:396
 get_random_u32+0x2e8/0x860 drivers/char/random.c:541
 get_random_u32_below include/linux/random.h:86 [inline]
 get_random_u32_inclusive include/linux/random.h:115 [inline]
 rfc3315_s14_backoff_update+0x14/0xc0 net/ipv6/addrconf.c:116
 addrconf_rs_timer+0x324/0x6c0 net/ipv6/addrconf.c:4078
 call_timer_fn+0x192/0x5e0 kernel/time/timer.c:1748
 expire_timers kernel/time/timer.c:1799 [inline]
 __run_timers kernel/time/timer.c:2374 [inline]
 __run_timer_base+0x67b/0x9b0 kernel/time/timer.c:2386
 run_timer_base kernel/time/timer.c:2395 [inline]
 run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2405
 handle_softirqs+0x1d9/0x6c0 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 run_ktimerd+0x69/0x100 kernel/softirq.c:1151
 smpboot_thread_fn+0x57c/0xa80 kernel/smpboot.c:160
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>