INFO: task syz-executor:16781 blocked for more than 143 seconds.
      Not tainted 6.10.0-rc5-next-20240627-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:19600 pid:16781 tgid:16781 ppid:1      flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x17e8/0x4a20 kernel/sched/core.c:6597
 __schedule_loop kernel/sched/core.c:6674 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6689
 netfs_wait_for_outstanding_io include/linux/netfs.h:535 [inline]
 v9fs_evict_inode+0x171/0x360 fs/9p/vfs_inode.c:352
 evict+0x2a8/0x630 fs/inode.c:669
 __dentry_kill+0x20d/0x630 fs/dcache.c:603
 dput+0x19f/0x2b0 fs/dcache.c:845
 shrink_dcache_for_umount+0xb4/0x180 fs/dcache.c:1555
 generic_shutdown_super+0x6a/0x2d0 fs/super.c:620
 kill_anon_super+0x3b/0x70 fs/super.c:1226
 v9fs_kill_super+0x4c/0x90 fs/9p/vfs_super.c:193
 deactivate_locked_super+0xc4/0x130 fs/super.c:473
 cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1372
 task_work_run+0x24f/0x310 kernel/task_work.c:180
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x168/0x370 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efd59b76e57
RSP: 002b:00007ffd2302f778 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007efd59b76e57
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd2302f830
RBP: 00007ffd2302f830 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffd230308e0
R13: 00007efd59be364a R14: 00000000000f4edc R15: 00007ffd23030920
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/30:
 #0: ffffffff8e3357e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:333 [inline]
 #0: ffffffff8e3357e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:845 [inline]
 #0: ffffffff8e3357e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6704
4 locks held by kworker/0:2/1148:
 #0: ffff88801d2d8548 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3199 [inline]
 #0: ffff88801d2d8548 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3305
 #1: ffffc90004287d00 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3200 [inline]
 #1: ffffc90004287d00 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3305
 #2: ffff888023923190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1009 [inline]
 #2: ffff888023923190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1fe/0x5150 drivers/usb/core/hub.c:5849
 #3: ffff88807d24c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1009 [inline]
 #3: ffff88807d24c190 (&dev->mutex){....}-{3:3}, at: __device_attach+0x8e/0x520 drivers/base/dd.c:1004
2 locks held by kworker/u8:9/2461:
 #0: ffff888015089148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3199 [inline]
 #0: ffff888015089148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3305
 #1: ffffc90008e97d00 ((work_completion)(&wreq->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3200 [inline]
 #1: ffffc90008e97d00 ((work_completion)(&wreq->work)){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3305
2 locks held by getty/4850:
 #0: ffff88802b1570a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc900031332f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2211
2 locks held by kworker/u8:11/10780:
1 lock held by syz-executor/16781:
 #0: ffff88802e9320e0 (&type->s_umount_key#81){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline]
 #0: ffff88802e9320e0 (&type->s_umount_key#81){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
 #0: ffff88802e9320e0 (&type->s_umount_key#81){+.+.}-{3:3}, at: deactivate_super+0xb5/0xf0 fs/super.c:505
1 lock held by syz-executor/19592:
 #0: ffff8880b943e958 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xb0/0x140 kernel/sched/core.c:576

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.10.0-rc5-next-20240627-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
 watchdog+0xfee/0x1030 kernel/hung_task.c:379
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 19872 Comm: syz.1.2947 Not tainted 6.10.0-rc5-next-20240627-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:validate_chain+0x5b1/0x5920 kernel/locking/lockdep.c:3913
Code: c1 e8 03 42 0f b6 04 20 84 c0 0f 85 5f 48 00 00 83 3d 1e 4c 3f 0e 00 48 8b 8c 24 c0 00 00 00 0f 84 2e 3f 00 00 b8 01 00 00 00 <48> c7 84 24 00 01 00 00 0e 36 e0 45 49 c7 04 0c 00 00 00 00 49 c7
RSP: 0018:ffffc90000a18200 EFLAGS: 00000002
RAX: 0000000000000001 RBX: 0000000000022021 RCX: 1ffff92000143060
RDX: 0000000000000000 RSI: ffff88801fe48b30 RDI: ffff88801fe48000
RBP: ffffc90000a18500 R08: ffffffff93007787 R09: 1ffffffff2600ef0
R10: dffffc0000000000 R11: fffffbfff2600ef1 R12: dffffc0000000000
R13: ffff88801fe48b50 R14: 2c2a7c82d6aa0517 R15: 0000000000000000
FS:  00007f49dc91e6c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d20eff8 CR3: 000000007bf26000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 00000000872c9164 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 __lock_acquire+0x1359/0x2000 kernel/locking/lockdep.c:5193
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5816
 rcu_lock_acquire include/linux/rcupdate.h:333 [inline]
 rcu_read_lock include/linux/rcupdate.h:845 [inline]
 nf_hook+0xbf/0x450 include/linux/netfilter.h:238
 NF_HOOK_COND include/linux/netfilter.h:302 [inline]
 ip6_output+0x26f/0x3c0 net/ipv6/ip6_output.c:243
 NF_HOOK include/linux/netfilter.h:314 [inline]
 ndisc_send_skb+0xab2/0x1380 net/ipv6/ndisc.c:509
 addrconf_rs_timer+0x36e/0x660 net/ipv6/addrconf.c:4039
 call_timer_fn+0x18e/0x650 kernel/time/timer.c:1792
 expire_timers kernel/time/timer.c:1843 [inline]
 __run_timers kernel/time/timer.c:2417 [inline]
 __run_timer_base+0x66a/0x8e0 kernel/time/timer.c:2428
 run_timer_base kernel/time/timer.c:2437 [inline]
 run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2447
 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554
 __do_softirq kernel/softirq.c:588 [inline]
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 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+0x1ea/0x870 kernel/sched/core.c:5123
Code: c9 50 e8 09 b8 0b 00 48 83 c4 08 4c 89 f7 e8 dd 38 00 00 e9 de 04 00 00 4c 89 f7 e8 40 0b 37 0a e8 9b 84 37 00 fb 48 8b 5d c0 <48> 8d bb f8 15 00 00 48 89 f8 48 c1 e8 03 49 be 00 00 00 00 00 fc
RSP: 0018:ffffc900091e7568 EFLAGS: 00000286
RAX: 1fa9a2bab8e5ea00 RBX: ffff88801fe48000 RCX: ffffffff947eb803
RDX: dffffc0000000000 RSI: ffffffff8bcac900 RDI: ffffffff8c206fe0
RBP: ffffc900091e75b0 R08: ffffffff8faf392f R09: 1ffffffff1f5e725
R10: dffffc0000000000 R11: fffffbfff1f5e726 R12: 1ffff110172a7ed7
R13: dffffc0000000000 R14: ffff8880b943e940 R15: ffff8880b953f6b8
 context_switch kernel/sched/core.c:5252 [inline]
 __schedule+0x17f0/0x4a20 kernel/sched/core.c:6597
 __schedule_loop kernel/sched/core.c:6674 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6689
 schedule_timeout+0xb0/0x310 kernel/time/timer.c:2557
 do_wait_for_common kernel/sched/completion.c:95 [inline]
 __wait_for_common kernel/sched/completion.c:116 [inline]
 wait_for_common kernel/sched/completion.c:127 [inline]
 wait_for_completion+0x355/0x620 kernel/sched/completion.c:148
 rdmsr_safe_on_cpu+0x16c/0x310 arch/x86/lib/msr-smp.c:181
 msr_read+0x160/0x260 arch/x86/kernel/msr.c:66
 vfs_read+0x204/0xbc0 fs/read_write.c:474
 ksys_read+0x1a0/0x2c0 fs/read_write.c:619
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f49dbb75b29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f49dc91e048 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f49dbd03fa0 RCX: 00007f49dbb75b29
RDX: 0000000000018ff8 RSI: 0000000020019680 RDI: 0000000000000004
RBP: 00007f49dbbf6756 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f49dbd03fa0 R15: 00007ffd18856318
 </TASK>