INFO: task syz.6.3691:23243 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.6.3691 state:D stack:26504 pid:23243 tgid:23242 ppid:19399 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0x1585/0x5340 kernel/sched/core.c:6907
__schedule_loop kernel/sched/core.c:6989 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7004
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7061
__mutex_lock_common kernel/locking/mutex.c:692 [inline]
__mutex_lock+0x7fe/0x1300 kernel/locking/mutex.c:776
blk_trace_setup2 kernel/trace/blktrace.c:822 [inline]
blk_trace_ioctl+0x61f/0x740 kernel/trace/blktrace.c:931
blkdev_ioctl+0x4c1/0x740 block/ioctl.c:793
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f196b79c629
RSP: 002b:00007f196c5c8028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f196ba15fa0 RCX: 00007f196b79c629
RDX: 0000200000000240 RSI: 00000000c0c0128e RDI: 0000000000000003
RBP: 00007f196b832b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f196ba16038 R14: 00007f196ba15fa0 R15: 00007fffae8dc808
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#0: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#0: ffffffff8e7602e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
3 locks held by kworker/u8:3/49:
#0: ffff88801b0ac148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x855/0x1650 kernel/workqueue.c:3254
#1: ffffc90000b97c40 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x87c/0x1650 kernel/workqueue.c:3255
#2: ffffffff8fbd0308 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:313
6 locks held by kworker/u8:4/72:
#0: ffff88801c2ae948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x855/0x1650 kernel/workqueue.c:3254
#1: ffffc900015f7c40 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x87c/0x1650 kernel/workqueue.c:3255
#2: ffffffff8fbc14f0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf4/0x800 net/core/net_namespace.c:675
#3: ffff88805a6bd0e8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:895 [inline]
#3: ffff88805a6bd0e8 (&dev->mutex){....}-{4:4}, at: devl_dev_lock net/devlink/devl_internal.h:108 [inline]
#3: ffff88805a6bd0e8 (&dev->mutex){....}-{4:4}, at: devlink_pernet_pre_exit+0x117/0x3f0 net/devlink/core.c:504
#4: ffff88805023a250 (&devlink->lock_key#19){+.+.}-{4:4}, at: devl_lock net/devlink/core.c:274 [inline]
#4: ffff88805023a250 (&devlink->lock_key#19){+.+.}-{4:4}, at: devl_dev_lock net/devlink/devl_internal.h:109 [inline]
#4: ffff88805023a250 (&devlink->lock_key#19){+.+.}-{4:4}, at: devlink_pernet_pre_exit+0x129/0x3f0 net/devlink/core.c:504
#5: ffffffff8fbd0308 (rtnl_mutex){+.+.}-{4:4}, at: register_nexthop_notifier+0x88/0x290 net/ipv4/nexthop.c:3971
2 locks held by getty/5585:
#0: ffff8880330850a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0 drivers/tty/n_tty.c:2211
3 locks held by kworker/0:5/5891:
3 locks held by kworker/0:7/5900:
2 locks held by syz.2.3610/22881:
3 locks held by kworker/u9:0/23063:
#0: ffff88802a861948 ((wq_completion)hci4){+.+.}-{0:0}, at: process_one_work+0x855/0x1650 kernel/workqueue.c:3254
#1: ffffc90004b5fc40 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work+0x87c/0x1650 kernel/workqueue.c:3255
#2: ffff88817ed00ec0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_cmd_sync_work+0x1d3/0x400 net/bluetooth/hci_sync.c:331
1 lock held by syz.6.3691/23243:
#0: ffff88802799b888 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup2 kernel/trace/blktrace.c:822 [inline]
#0: ffff88802799b888 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_ioctl+0x61f/0x740 kernel/trace/blktrace.c:931
9 locks held by syz-executor/24577:
#0: ffff888033f16420 (sb_writers#7){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2710 [inline]
#0: ffff888033f16420 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x227/0xb90 fs/read_write.c:684
#1: ffff88807c36bc88 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1de/0x540 fs/kernfs/file.c:343
#2: ffff888028ffa788 (kn->active#52){.+.+}-{0:0}, at: kernfs_get_active_of fs/kernfs/file.c:80 [inline]
#2: ffff888028ffa788 (kn->active#52){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x231/0x540 fs/kernfs/file.c:344
#3: ffffffff8f4442a8 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xd7/0x370 drivers/net/netdevsim/bus.c:234
#4: ffff8880222f00e8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:895 [inline]
#4: ffff8880222f00e8 (&dev->mutex){....}-{4:4}, at: __device_driver_lock drivers/base/dd.c:1106 [inline]
#4: ffff8880222f00e8 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xb6/0x860 drivers/base/dd.c:1304
#5: ffff8880222f6250 (&devlink->lock_key#16){+.+.}-{4:4}, at: nsim_drv_remove+0x50/0x170 drivers/net/netdevsim/dev.c:1779
#6: ffffffff8fbd0308 (rtnl_mutex){+.+.}-{4:4}, at: nsim_destroy+0xed/0x680 drivers/net/netdevsim/netdev.c:1178
#7: ffff88807af20d50 (&dev_instance_lock_key#24){+.+.}-{4:4}, at: netdev_lock include/linux/netdevice.h:2789 [inline]
#7: ffff88807af20d50 (&dev_instance_lock_key#24){+.+.}-{4:4}, at: unregister_netdevice_many_notify+0x583/0x2380 net/core/dev.c:12382
#8: ffffffff8e766578 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:311 [inline]
#8: ffffffff8e766578 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770 kernel/rcu/tree_exp.h:961
1 lock held by syz.8.3921/24661:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:161 [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:346 [inline]
watchdog+0xfd9/0x1030 kernel/hung_task.c:515
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 24661 Comm: syz.8.3921 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:arch_atomic64_add arch/x86/include/asm/atomic64_64.h:-1 [inline]
RIP: 0010:raw_atomic64_add include/linux/atomic/atomic-arch-fallback.h:2672 [inline]
RIP: 0010:raw_atomic_long_add include/linux/atomic/atomic-long.h:121 [inline]
RIP: 0010:atomic_long_add include/linux/atomic/atomic-instrumented.h:3261 [inline]
RIP: 0010:update_tg_load_avg kernel/sched/fair.c:4117 [inline]
RIP: 0010:update_load_avg+0xfd8/0x1ec0 kernel/sched/fair.c:4724
Code: 7c 05 00 00 74 08 4c 89 ff e8 74 87 96 00 4d 8b 3f 49 8d bf 40 01 00 00 be 08 00 00 00 e8 00 8a 96 00 f0 4d 01 a7 40 01 00 00 <49> bc 00 00 00 00 00 fc ff df 48 8b 44 24 08 42 80 3c 20 00 4c 8b
RSP: 0018:ffffc90000007ad8 EFLAGS: 00000017
RAX: dffffc0000000001 RBX: 0000017c045d1bf7 RCX: ffffffff81995690
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88806e798b00
RBP: 1ffff1100529e628 R08: ffff88806e798b07 R09: 1ffff1100dcf3160
R10: dffffc0000000000 R11: ffffed100dcf3161 R12: ffffffffffffff9f
R13: 1ffff1100529e633 R14: ffff8880294f3140 R15: ffff88806e7989c0
FS: 00007fbc849d66c0(0000) GS:ffff888125457000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbc7a7ff000 CR3: 00000000a4458000 CR4: 00000000003526f0
Call Trace:
entity_tick kernel/sched/fair.c:5524 [inline]
task_tick_fair+0x8d/0x8e0 kernel/sched/fair.c:13365
sched_tick+0x242/0x820 kernel/sched/core.c:5570
update_process_times+0x26f/0x2f0 kernel/time/timer.c:2479
tick_sched_handle kernel/time/tick-sched.c:298 [inline]
tick_nohz_handler+0x42b/0x770 kernel/time/tick-sched.c:319
__run_hrtimer kernel/time/hrtimer.c:1785 [inline]
__hrtimer_run_queues+0x4e7/0xcc0 kernel/time/hrtimer.c:1849
hrtimer_interrupt+0x42b/0x1010 kernel/time/hrtimer.c:1911
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
__sysvec_apic_timer_interrupt+0x102/0x460 arch/x86/kernel/apic/apic.c:1062
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2039 [inline]
RIP: 0010:vprintk_emit+0x45d/0x560 kernel/printk/printk.c:2478
Code: 0f 84 44 ff ff ff e8 b2 2c 21 00 fb eb 44 e8 aa 2c 21 00 e8 a5 5c 0b 0a 4d 85 f6 74 94 e8 9b 2c 21 00 fb 48 c7 c7 20 27 75 8e <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 cb 16
RSP: 0018:ffffc90003a27700 EFLAGS: 00000283
RAX: ffffffff81a485f5 RBX: ffffffff81a4846f RCX: 0000000000080000
RDX: ffffc9001e1d9000 RSI: 0000000000058a18 RDI: ffffffff8e752720
RBP: ffffc90003a277b0 R08: ffffffff9011c2b7 R09: 1ffffffff2023856
R10: dffffc0000000000 R11: fffffbfff2023857 R12: 0000000000000000
R13: 0000000000000021 R14: 0000000000000200 R15: 1ffff92000744ee4
_printk+0xdd/0x130 kernel/printk/printk.c:2504
logfc+0x431/0x520 fs/fs_context.c:-1
__fs_parse+0x37c/0x730 fs/fs_parser.c:118
fs_parse include/linux/fs_parser.h:76 [inline]
xfs_fs_parse_param+0xf0/0xe70 fs/xfs/xfs_super.c:1415
vfs_parse_fs_param+0x1a9/0x420 fs/fs_context.c:132
vfs_parse_fs_qstr fs/fs_context.c:173 [inline]
vfs_parse_fs_string include/linux/fs_context.h:142 [inline]
vfs_parse_monolithic_sep+0x283/0x360 fs/fs_context.c:213
do_new_mount+0x304/0xd30 fs/namespace.c:3836
do_mount fs/namespace.c:4173 [inline]
__do_sys_mount fs/namespace.c:4362 [inline]
__se_sys_mount+0x31d/0x420 fs/namespace.c:4339
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbc83b9d8ca
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbc849d5e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fbc849d5ee0 RCX: 00007fbc83b9d8ca
RDX: 00002000000000c0 RSI: 0000200000009780 RDI: 00007fbc849d5ea0
RBP: 00002000000000c0 R08: 00007fbc849d5ee0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000009780
R13: 00007fbc849d5ea0 R14: 0000000000009730 R15: 00002000000003c0