INFO: task syz.3.2134:13736 blocked for more than 145 seconds.
Not tainted 6.11.0-next-20240924-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.2134 state:D stack:23808 pid:13736 tgid:13736 ppid:13232 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5315 [inline]
__schedule+0x1895/0x4b30 kernel/sched/core.c:6675
__schedule_loop kernel/sched/core.c:6752 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6767
schedule_timeout+0xb0/0x290 kernel/time/sleep_timeout.c:75
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
__vhost_worker_flush+0x1e6/0x280 drivers/vhost/vhost.c:288
vhost_worker_flush drivers/vhost/vhost.c:295 [inline]
vhost_dev_flush+0xc9/0x150 drivers/vhost/vhost.c:305
vhost_net_flush+0x24/0x160 drivers/vhost/net.c:1359
vhost_net_release+0x109/0x470 drivers/vhost/net.c:1380
__fput+0x23f/0x880 fs/file_table.c:431
task_work_run+0x24f/0x310 kernel/task_work.c:228
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: 0033:0x7f188397def9
RSP: 002b:00007ffd61ed6218 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f1883b37a80 RCX: 00007f188397def9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f1883b37a80 R08: 0000000000000006 R09: 00007ffd61ed650f
R10: 00000000003ffbcc R11: 0000000000000246 R12: 0000000000116d9a
R13: 00007ffd61ed6320 R14: 0000000000000032 R15: ffffffffffffffff
Showing all locks held in the system:
5 locks held by kworker/0:0/8:
1 lock held by khungtaskd/30:
#0: ffffffff8e937f20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff8e937f20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8e937f20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6720
5 locks held by kworker/1:1/57:
#0: ffff888020ed8d48 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline]
#0: ffff888020ed8d48 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310
#1: ffffc9000122fd00 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline]
#1: ffffc9000122fd00 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310
#2: ffff8880281d4190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1014 [inline]
#2: ffff8880281d4190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1fe/0x5150 drivers/usb/core/hub.c:5849
#3: ffff888028e2b190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1014 [inline]
#3: ffff888028e2b190 (&dev->mutex){....}-{3:3}, at: __device_attach+0x8e/0x520 drivers/base/dd.c:1005
#4: ffff8880212be160 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1014 [inline]
#4: ffff8880212be160 (&dev->mutex){....}-{3:3}, at: __device_attach+0x8e/0x520 drivers/base/dd.c:1005
2 locks held by getty/4987:
#0: ffff88802eb860a0 (&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+0x6a6/0x1e00 drivers/tty/n_tty.c:2211
4 locks held by kworker/u8:13/7110:
3 locks held by kworker/0:7/10197:
1 lock held by syz-executor/14458:
#0: ffffffff8e93d380 (rcu_state.barrier_mutex
){+.+.}-{3:3}
, at: rcu_barrier+0x4c/0x530 kernel/rcu/tree.c:4561
1 lock held by syz.2.2308/14661:
1 lock held by syz.3.2309/14683:
#0: ffffc900045790a8 (&kvm->slots_lock){+.+.}-{3:3}, at: kvm_assign_ioeventfd_idx+0x27b/0x990 virt/kvm/eventfd.c:855
1 lock held by syz.3.2309/14684:
#0: ffffc900045790a8 (&kvm->slots_lock){+.+.}-{3:3}, at: kvm_assign_ioeventfd_idx+0x27b/0x990 virt/kvm/eventfd.c:855
1 lock held by syz.3.2309/14685:
#0: ffffc900045790a8 (&kvm->slots_lock){+.+.}-{3:3}, at: kvm_deassign_ioeventfd_idx+0x89/0x5e0 virt/kvm/eventfd.c:903
1 lock held by syz.3.2309/14686:
#0: ffffffff8e93d4b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline]
#0: ffffffff8e93d4b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x381/0x830 kernel/rcu/tree_exp.h:976
2 locks held by syz.0.2312/14671:
1 lock held by syz.4.2313/14681:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-next-20240924-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
__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+0xff4/0x1040 kernel/hung_task.c:379
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 6.11.0-next-20240924-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
RIP: 0010:variable_test_bit arch/x86/include/asm/bitops.h:227 [inline]
RIP: 0010:arch_test_bit arch/x86/include/asm/bitops.h:239 [inline]
RIP: 0010:_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:142 [inline]
RIP: 0010:__lock_acquire+0xc95/0x2050 kernel/locking/lockdep.c:5172
Code: 63 9c 24 88 00 00 00 48 89 d8 48 c1 e8 06 48 8d 3c c5 00 78 2c 94 be 08 00 00 00 e8 b5 55 8e 00 48 bf 00 00 00 00 00 fc ff df <48> 0f a3 1d 83 26 bc 12 0f 83 11 09 00 00 49 8d 9c 24 d0 0a 00 00
RSP: 0018:ffffc90000a18ad0 EFLAGS: 00000056
RAX: 0000000000000001 RBX: 0000000000000051 RCX: ffffffff8170516b
RDX: 0000000000000000 RSI: 0000000000000008 RDI: dffffc0000000000
RBP: ffff88801d2f0b08 R08: ffffffff942c780f R09: 1ffffffff2858f01
R10: dffffc0000000000 R11: fffffbfff2858f02 R12: ffff88801d2f0000
R13: ffff88801d2f0ad8 R14: 0000000000000000 R15: ffff88801d2f0b28
FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8c0c63f000 CR3: 000000004e91c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
seqcount_lockdep_reader_access+0xfc/0x220 include/linux/seqlock.h:72
timekeeping_debug_get_ns kernel/time/timekeeping.c:256 [inline]
timekeeping_get_ns+0x5c/0x420 kernel/time/timekeeping.c:401
ktime_get_update_offsets_now+0x90/0x250 kernel/time/timekeeping.c:2449
hrtimer_update_base kernel/time/hrtimer.c:634 [inline]
hrtimer_interrupt+0x133/0x990 kernel/time/hrtimer.c:1799
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1026 [inline]
__sysvec_apic_timer_interrupt+0x110/0x3f0 arch/x86/kernel/apic/apic.c:1043
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1037 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1037
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:37 [inline]
RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:92 [inline]
RIP: 0010:acpi_safe_halt+0x21/0x30 drivers/acpi/processor_idle.c:112
Code: 90 90 90 90 90 90 90 90 90 65 48 8b 04 25 c0 d7 03 00 48 f7 00 08 00 00 00 75 10 66 90 0f 00 2d 65 29 a3 00 f3 0f 1e fa fb f4 c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90
RSP: 0018:ffffc900001a7d08 EFLAGS: 00000246
RAX: ffff88801d2f0000 RBX: ffff888140af5864 RCX: 0000000002191b21
RDX: 0000000000000001 RSI: ffff888140af5800 RDI: ffff888140af5864
RBP: 000000000003a9b8 R08: ffff8880b8737e9b R09: 1ffff110170e6fd3
R10: dffffc0000000000 R11: ffffffff8bc7b8f0 R12: ffff88801fb72000
R13: 0000000000000001 R14: 0000000000000001 R15: ffffffff8f130920
acpi_idle_enter+0xe4/0x140 drivers/acpi/processor_idle.c:702
cpuidle_enter_state+0x109/0x470 drivers/cpuidle/cpuidle.c:264
cpuidle_enter+0x5d/0xa0 drivers/cpuidle/cpuidle.c:385
call_cpuidle kernel/sched/idle.c:155 [inline]
cpuidle_idle_call kernel/sched/idle.c:230 [inline]
do_idle+0x375/0x5d0 kernel/sched/idle.c:326
cpu_startup_entry+0x42/0x60 kernel/sched/idle.c:424
start_secondary+0x102/0x110 arch/x86/kernel/smpboot.c:314
common_startup_64+0x13e/0x147