INFO: task syz.1.171:6700 blocked for more than 144 seconds.
Not tainted 6.14.0-rc4-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.171 state:D stack:22000 pid:6700 tgid:6699 ppid:5830 task_flags:0x400140 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5378 [inline]
__schedule+0x190e/0x4c90 kernel/sched/core.c:6765
__schedule_loop kernel/sched/core.c:6842 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6857
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6914
__mutex_lock_common kernel/locking/mutex.c:662 [inline]
__mutex_lock+0x817/0x1010 kernel/locking/mutex.c:730
sync_bdevs+0x1ae/0x340 block/bdev.c:1246
ksys_sync+0xe2/0x1c0 fs/sync.c:105
__do_sys_sync+0xe/0x20 fs/sync.c:113
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: 0033:0x7f902e78d169
RSP: 002b:00007f902f59c038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f902e9a5fa0 RCX: 00007f902e78d169
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f902e9a5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f902e9a5fa0 R15: 00007fffb4945f78
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8eb38f60 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff8eb38f60 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8eb38f60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6746
2 locks held by kworker/u8:2/35:
#0: ffff88801b081148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline]
#0: ffff88801b081148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x98b/0x18e0 kernel/workqueue.c:3317
#1: ffffc90000ab7c60 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline]
#1: ffffc90000ab7c60 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9c6/0x18e0 kernel/workqueue.c:3317
2 locks held by kworker/u8:4/63:
3 locks held by kworker/1:2/1569:
#0: ffff88801b078d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline]
#0: ffff88801b078d48 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x98b/0x18e0 kernel/workqueue.c:3317
#1: ffffc9000509fc60 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline]
#1: ffffc9000509fc60 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9c6/0x18e0 kernel/workqueue.c:3317
#2: ffff88807a2b6240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x314/0x3f00 drivers/net/netdevsim/fib.c:1490
1 lock held by acpid/5188:
#0: ffffffff8eb3e438 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:334 [inline]
#0: ffffffff8eb3e438 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x451/0x820 kernel/rcu/tree_exp.h:996
2 locks held by getty/5591:
#0: ffff8880354ea0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002fde2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x616/0x1770 drivers/tty/n_tty.c:2211
1 lock held by udevd/5852:
#0: ffff88802790e4c8 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xf0/0xc50 block/bdev.c:903
3 locks held by kworker/0:7/5897:
8 locks held by kworker/1:5/5910:
#0: ffff888020e94d48 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3211 [inline]
#0: ffff888020e94d48 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x98b/0x18e0 kernel/workqueue.c:3317
#1: ffffc9000456fc60 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3212 [inline]
#1: ffffc9000456fc60 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x9c6/0x18e0 kernel/workqueue.c:3317
#2: ffff888145358190 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1030 [inline]
#2: ffff888145358190 (&dev->mutex){....}-{4:4}, at: hub_event+0x1fe/0x5150 drivers/usb/core/hub.c:5861
#3: ffff888057ddc190 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1030 [inline]
#3: ffff888057ddc190 (&dev->mutex){....}-{4:4}, at: usb_disconnect+0x103/0x950 drivers/usb/core/hub.c:2307
#4: ffff8880285b8160 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1030 [inline]
#4: ffff8880285b8160 (&dev->mutex){....}-{4:4}, at: __device_driver_lock drivers/base/dd.c:1095 [inline]
#4: ffff8880285b8160 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xce/0x7c0 drivers/base/dd.c:1293
#5: ffff888059ebda20 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1030 [inline]
#5: ffff888059ebda20 (&dev->mutex){....}-{4:4}, at: __device_driver_lock drivers/base/dd.c:1095 [inline]
#5: ffff888059ebda20 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xce/0x7c0 drivers/base/dd.c:1293
#6: ffffffff8f968e08 (input_mutex){+.+.}-{4:4}, at: class_mutex_constructor include/linux/mutex.h:201 [inline]
#6: ffffffff8f968e08 (input_mutex){+.+.}-{4:4}, at: __input_unregister_device+0x2f3/0x620 drivers/input/input.c:2221
#7: ffffffff8eb3e438 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:334 [inline]
#7: ffffffff8eb3e438 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x451/0x820 kernel/rcu/tree_exp.h:996
1 lock held by syz.1.171/6700:
#0: ffff88802790e4c8 (&disk->open_mutex){+.+.}-{4:4}, at: sync_bdevs+0x1ae/0x340 block/bdev.c:1246
1 lock held by syz.5.204/6823:
#0: ffff88802790e4c8 (&disk->open_mutex){+.+.}-{4:4}, at: sync_bdevs+0x1ae/0x340 block/bdev.c:1246
1 lock held by syz.3.222/6892:
#0: ffff88802790e4c8 (&disk->open_mutex){+.+.}-{4:4}, at: sync_bdevs+0x1ae/0x340 block/bdev.c:1246
1 lock held by syz.6.282/7164:
#0: ffff88802790e4c8
(
&disk->open_mutex
){+.+.}-{4:4}
, at: sync_bdevs+0x1ae/0x340 block/bdev.c:1246
1 lock held by syz.0.319/7360:
#0: ffff88802790e4c8 (&disk->open_mutex){+.+.}-{4:4}, at: sync_bdevs+0x1ae/0x340 block/bdev.c:1246
7 locks held by kworker/u8:13/7515:
#0: ffff88814c702148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: raw_spin_rq_lock_nested+0xb0/0x140 kernel/sched/core.c:606
#1: ffff8880b8628948 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x41d/0x7a0 kernel/sched/psi.c:987
#2: ffffffff9a8d4168 (&obj_hash[i].lock){-.-.}-{2:2}, at: __debug_check_no_obj_freed lib/debugobjects.c:1088 [inline]
#2: ffffffff9a8d4168 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_check_no_obj_freed+0x234/0x580 lib/debugobjects.c:1129
#3: ffff8880b863e958 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xb0/0x140 kernel/sched/core.c:606
#4: ffff888033b8e428 (&p->pi_lock){-.-.}-{2:2}, at: class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:551 [inline]
#4: ffff888033b8e428 (&p->pi_lock){-.-.}-{2:2}, at: try_to_wake_up+0xc2/0x1470 kernel/sched/core.c:4214
#5: ffff8880b862a398 (&base->lock){-.-.}-{2:2}
, at: lock_timer_base kernel/time/timer.c:1046 [inline]
, at: __mod_timer+0x24a/0x10e0 kernel/time/timer.c:1127
#6: ffffffff9a8ff620 (&obj_hash[i].lock){-.-.}-{2:2}
, at: debug_object_activate+0x17f/0x580 lib/debugobjects.c:818
8 locks held by syz-executor/8250:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.14.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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:236 [inline]
watchdog+0x1058/0x10a0 kernel/hung_task.c:399
kthread+0x7ab/0x920 kernel/kthread.c:464
ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 8250 Comm: syz-executor Not tainted 6.14.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:get_current arch/x86/include/asm/current.h:49 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:216
Code: 8b 3d 64 45 93 0c 48 89 de 5b e9 33 e5 5b 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0c 25 80 d6 03 00 65 8b 15 70 18 42 7e 81 e2 00 01 ff 00
RSP: 0018:ffffc90000007a78 EFLAGS: 00000246
RAX: ffffffff8a028bc3 RBX: 0000000000000000 RCX: ffff8880289eda00
RDX: ffff8880289eda00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888052a43800 R08: ffffffff8a028b27 R09: fffff52000000f54
R10: dffffc0000000000 R11: fffff52000000f54 R12: ffff888052a43808
R13: ffff88803584f31a R14: 0000000000000000 R15: 1ffff11006b09e63
FS: 0000555577b9f500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f71f6978ab8 CR3: 0000000082a10000 CR4: 0000000000350ef0
Call Trace:
pie_calculate_probability+0xf3/0x820
fq_pie_timer+0x26d/0x590 net/sched/sch_fq_pie.c:400
call_timer_fn+0x189/0x650 kernel/time/timer.c:1789
expire_timers kernel/time/timer.c:1840 [inline]
__run_timers kernel/time/timer.c:2414 [inline]
__run_timer_base+0x66a/0x8e0 kernel/time/timer.c:2426
run_timer_base kernel/time/timer.c:2435 [inline]
run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2445
handle_softirqs+0x2d6/0x9b0 kernel/softirq.c:561
__do_softirq kernel/softirq.c:595 [inline]
invoke_softirq kernel/softirq.c:435 [inline]
__irq_exit_rcu+0xf7/0x220 kernel/softirq.c:662
irq_exit_rcu+0x9/0x30 kernel/softirq.c:678
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2061 [inline]
RIP: 0010:vprintk_emit+0x700/0xa10 kernel/printk/printk.c:2431
Code: 00 e8 c4 31 21 00 4c 8d bc 24 a0 00 00 00 4d 85 e4 75 07 e8 b2 31 21 00 eb 06 e8 ab 31 21 00 fb 49 bc 00 00 00 00 00 fc ff df <48> c7 c7 20 4b a1 8e 31 f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00
RSP: 0018:ffffc900033969e0 EFLAGS: 00000293
RAX: ffffffff81a08c55 RBX: 0000000000000000 RCX: ffff8880289eda00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003396af0 R08: ffffffff81a08c2e R09: 1ffffffff28a9320
R10: dffffc0000000000 R11: fffffbfff28a9321 R12: dffffc0000000000
R13: 1ffff92000672d40 R14: ffffffff81a08a90 R15: ffffc90003396a80
_printk+0xd5/0x120 kernel/printk/printk.c:2457
batadv_check_known_mac_addr+0x2b1/0x410 net/batman-adv/hard-interface.c:526
batadv_hard_if_event+0x3a5/0x1810 net/batman-adv/hard-interface.c:998
notifier_call_chain+0x1a7/0x3f0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2250 [inline]
call_netdevice_notifiers net/core/dev.c:2264 [inline]
dev_set_mac_address+0x3d9/0x510 net/core/dev.c:9523
dev_set_mac_address_user+0x31/0x50 net/core/dev.c:9537
do_setlink+0x784/0x4300 net/core/rtnetlink.c:3073
rtnl_changelink net/core/rtnetlink.c:3733 [inline]
__rtnl_newlink net/core/rtnetlink.c:3885 [inline]
rtnl_newlink+0x1704/0x1d30 net/core/rtnetlink.c:4022
rtnetlink_rcv_msg+0x793/0xcf0 net/core/rtnetlink.c:6912
netlink_rcv_skb+0x208/0x480 net/netlink/af_netlink.c:2543
netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline]
netlink_unicast+0x7f8/0x990 net/netlink/af_netlink.c:1348
netlink_sendmsg+0x8de/0xcb0 net/netlink/af_netlink.c:1892
sock_sendmsg_nosec net/socket.c:718 [inline]
__sock_sendmsg+0x223/0x270 net/socket.c:733
__sys_sendto+0x363/0x4c0 net/socket.c:2187
__do_sys_sendto net/socket.c:2194 [inline]
__se_sys_sendto net/socket.c:2190 [inline]
__x64_sys_sendto+0xde/0x100 net/socket.c:2190
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: 0033:0x7f2cadd8effc
Code: 2a 5f 02 00 44 8b 4c 24 2c 4c 8b 44 24 20 89 c5 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 34 89 ef 48 89 44 24 08 e8 70 5f 02 00 48 8b
RSP: 002b:00007ffd032c04e0 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f2caead4620 RCX: 00007f2cadd8effc
RDX: 000000000000002c RSI: 00007f2caead4670 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007ffd032c0534 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f2caead4670 R15: 0000000000000000