INFO: task syz-executor.1:8431 blocked for more than 163 seconds.
      Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1  state:D stack:27424 pid:8431  tgid:8429  ppid:5077   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5409 [inline]
 __schedule+0xf15/0x5c70 kernel/sched/core.c:6736
 __schedule_loop kernel/sched/core.c:6813 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6828
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6885
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752
 bdev_release+0x161/0xb30 block/bdev.c:1028
 blkdev_release+0x15/0x20 block/fops.c:628
 __fput+0x270/0xb80 fs/file_table.c:422
 task_work_run+0x14e/0x250 kernel/task_work.c:180
 get_signal+0x105e/0x2760 kernel/signal.c:2683
 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:105 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline]
 syscall_exit_to_user_mode+0x14a/0x2a0 kernel/entry/common.c:212
 do_syscall_64+0xe2/0x260 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f1ad747dda9
RSP: 002b:00007f1ad81db0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 00007f1ad75abf80 RCX: 00007f1ad747dda9
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003
RBP: 00007f1ad74ca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f1ad75abf80 R15: 00007ffc7318e2c8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/29:
 #0: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
 #0: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
 #0: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6614
2 locks held by kworker/u8:4/66:
 #0: ffff888015081148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1296/0x1a60 kernel/workqueue.c:3229
 #1: ffffc900015f7d80 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x906/0x1a60 kernel/workqueue.c:3230
2 locks held by kworker/u8:6/1033:
2 locks held by getty/4817:
 #0: ffff88802eeb10a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc900015e02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc8/0x1490 drivers/tty/n_tty.c:2201
4 locks held by syz-executor.2/5084:
1 lock held by udevd/5221:
 #0: ffff8880205f54c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_open+0x444/0xe30 block/bdev.c:862
1 lock held by syz-executor.0/7051:
 #0: ffffffff8d7bc4b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:291 [inline]
 #0: ffffffff8d7bc4b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x682/0x7a0 kernel/rcu/tree_exp.h:939
1 lock held by syz-executor.1/8431:
 #0: ffff8880205f54c8 (&disk->open_mutex){+.+.}-{3:3}, at: bdev_release+0x161/0xb30 block/bdev.c:1028
3 locks held by kworker/0:10/8537:
 #0: ffff888015078948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x1296/0x1a60 kernel/workqueue.c:3229
 #1: ffffc90003947d80 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work+0x906/0x1a60 kernel/workqueue.c:3230
 #2: ffff888029eb3240 (&data->fib_lock){+.+.}-{3:3}, at: nsim_fib_event_work+0x1bb/0x26e0 drivers/net/netdevsim/fib.c:1489
1 lock held by syz-executor.3/10520:
5 locks held by syz-executor.1/13209:

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

NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x29c/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+0x1a/0x30 arch/x86/entry/entry_64.S:243
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 13209 Comm: syz-executor.1 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
RIP: 0010:lookup_chain_cache kernel/locking/lockdep.c:3763 [inline]
RIP: 0010:lookup_chain_cache_add kernel/locking/lockdep.c:3782 [inline]
RIP: 0010:validate_chain kernel/locking/lockdep.c:3837 [inline]
RIP: 0010:__lock_acquire+0x1572/0x3b30 kernel/locking/lockdep.c:5137
Code: e5 e0 f0 c8 93 48 8d 43 f8 48 85 db 48 0f 45 d8 eb 04 48 83 eb 08 48 85 db 74 40 48 8d 7b 18 48 89 f8 48 c1 e8 03 80 3c 28 00 <0f> 85 bc 18 00 00 48 8b 43 18 49 39 c5 0f 84 a2 f7 ff ff 48 8d 7b
RSP: 0018:ffffc90000a089d8 EFLAGS: 00000046
RAX: 1ffffffff25986f3 RBX: ffffffff92cc3780 RCX: ffffffff816a5d5e
RDX: 1ffffffff27abe6d RSI: 0000000000000008 RDI: ffffffff92cc3798
RBP: dffffc0000000000 R08: 0000000000000000 R09: fffffbfff27b4e35
R10: ffffffff93da71af R11: 0000000000000006 R12: 000000000001a051
R13: 6d6e554a3b5a5b34 R14: ffff88805dd229c8 R15: 0000000000000002
FS:  00007fe9a25446c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffdb7d01d38 CR3: 000000007c424000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 lock_acquire kernel/locking/lockdep.c:5754 [inline]
 lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
 ref_tracker_free+0x129/0x820 lib/ref_tracker.c:243
 __netns_tracker_free include/net/net_namespace.h:348 [inline]
 put_net_track include/net/net_namespace.h:363 [inline]
 __sk_destruct+0x36a/0x730 net/core/sock.c:2204
 sk_destruct+0xc2/0xf0 net/core/sock.c:2223
 __sk_free+0xf4/0x3e0 net/core/sock.c:2234
 sk_free+0x7c/0xa0 net/core/sock.c:2245
 sock_put include/net/sock.h:1941 [inline]
 sctp_endpoint_destroy_rcu+0xe5/0x110 net/sctp/endpointola.c:193
 rcu_do_batch kernel/rcu/tree.c:2196 [inline]
 rcu_core+0x828/0x16b0 kernel/rcu/tree.c:2471
 __do_softirq+0x218/0x8de kernel/softirq.c:554
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu kernel/softirq.c:633 [inline]
 irq_exit_rcu+0xb9/0x120 kernel/softirq.c:645
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1043
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:finish_task_switch.isra.0+0x220/0xcc0 kernel/sched/core.c:5283
Code: a9 0a 00 00 44 8b 0d 37 d3 40 0e 45 85 c9 0f 85 c0 01 00 00 48 89 df e8 ae f8 ff ff e8 29 38 36 00 fb 65 48 8b 1d a0 03 a6 7e <48> 8d bb f0 15 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1
RSP: 0018:ffffc90003b272c0 EFLAGS: 00000202
RAX: 00000000000002e5 RBX: ffff88805dd21e00 RCX: 1ffffffff27b4f3d
RDX: 0000000000000000 RSI: ffffffff8b0cb740 RDI: ffffffff8b6e88a0
RBP: ffffc90003b27308 R08: 0000000000000001 R09: fffffbfff27b4e30
R10: ffffffff93da7187 R11: 0000000000000005 R12: ffff8880b953f3f8
R13: ffff88802ec21e00 R14: 0000000000000000 R15: ffff8880b953e680
 context_switch kernel/sched/core.c:5412 [inline]
 __schedule+0xf1d/0x5c70 kernel/sched/core.c:6736
 preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:6915
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:12
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
 _raw_spin_unlock_irqrestore+0x61/0x80 kernel/locking/spinlock.c:194
 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
 drm_fb_helper_add_damage_clip drivers/gpu/drm/drm_fb_helper.c:625 [inline]
 drm_fb_helper_damage drivers/gpu/drm/drm_fb_helper.c:631 [inline]
 drm_fb_helper_damage_area+0x17e/0x230 drivers/gpu/drm/drm_fb_helper.c:691
 bit_putcs_unaligned drivers/video/fbdev/core/bitblit.c:139 [inline]
 bit_putcs+0x90e/0xdf0 drivers/video/fbdev/core/bitblit.c:188
 fbcon_putcs+0x314/0x3d0 drivers/video/fbdev/core/fbcon.c:1283
 do_update_region+0x3ec/0x680 drivers/tty/vt/vt.c:623
 csi_J+0x2e8/0xb50 drivers/tty/vt/vt.c:1539
 do_con_trol drivers/tty/vt/vt.c:2408 [inline]
 do_con_write+0x6d3f/0x7f50 drivers/tty/vt/vt.c:2905
 con_write+0x23/0xc0 drivers/tty/vt/vt.c:3251
 process_output_block drivers/tty/n_tty.c:574 [inline]
 n_tty_write+0x423/0x1150 drivers/tty/n_tty.c:2379
 iterate_tty_write drivers/tty/tty_io.c:1021 [inline]
 file_tty_write.constprop.0+0x518/0x9b0 drivers/tty/tty_io.c:1096
 call_write_iter include/linux/fs.h:2108 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0x6db/0x1100 fs/read_write.c:590
 ksys_write+0x12f/0x260 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7fe9a187dda9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe9a25440c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fe9a19abf80 RCX: 00007fe9a187dda9
RDX: 0000000000001006 RSI: 0000000020001040 RDI: 0000000000000004
RBP: 00007fe9a18ca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fe9a19abf80 R15: 00007ffe4f00fb58
 </TASK>