syzbot

INFO: task kworker/u8:0:12 blocked for more than 143 seconds.
      Not tainted 6.14.0-syzkaller-00826-g327ecdbc0fda #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:0    state:D stack:23832 pid:12    tgid:12    ppid:2      task_flags:0x4208060 flags:0x00004000
Workqueue: ib-unreg-wq ib_unregister_work
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5367 [inline]
 __schedule+0x112e/0x5b80 kernel/sched/core.c:6748
 __schedule_loop kernel/sched/core.c:6825 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6840
 schedule_timeout+0x244/0x280 kernel/time/sleep_timeout.c:75
 do_wait_for_common kernel/sched/completion.c:95 [inline]
 __wait_for_common+0x3e1/0x600 kernel/sched/completion.c:116
 disable_device+0x170/0x280 drivers/infiniband/core/device.c:1279
 __ib_unregister_device+0x2b4/0x480 drivers/infiniband/core/device.c:1502
 ib_unregister_work+0x19/0x30 drivers/infiniband/core/device.c:1614
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3400
 kthread+0x3af/0x750 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

Showing all locks held in the system:
6 locks held by kworker/0:1/10:
 #0: ffff888020eb1148 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3213
 #1: ffffc900000f7d18 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3214
 #2: ffff888145792190 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1030 [inline]
 #2: ffff888145792190 (&dev->mutex){....}-{4:4}, at: hub_event+0x1c1/0x4f80 drivers/usb/core/hub.c:5861
 #3: ffff888028325190 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1030 [inline]
 #3: ffff888028325190 (&dev->mutex){....}-{4:4}, at: __device_attach+0x7f/0x4b0 drivers/base/dd.c:1005
 #4: ffff8880216ae160 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1030 [inline]
 #4: ffff8880216ae160 (&dev->mutex){....}-{4:4}, at: __device_attach+0x7f/0x4b0 drivers/base/dd.c:1005
 #5: ffffffff8fe31648 (register_mutex#6){+.+.}-{4:4}, at: usb_audio_probe+0x4e3/0x3cf0 sound/usb/card.c:813
3 locks held by kworker/u8:0/12:
 #0: ffff888144ae8148 ((wq_completion)ib-unreg-wq){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3213
 #1: ffffc90000117d18 ((work_completion)(&device->unregistration_work)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3214
 #2: ffff88807dccc6c0 (&device->unregistration_lock){+.+.}-{4:4}, at: __ib_unregister_device+0x23b/0x480 drivers/infiniband/core/device.c:1498
1 lock held by khungtaskd/31:
 #0: ffffffff8e1be500 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #0: ffffffff8e1be500 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
 #0: ffffffff8e1be500 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6761
2 locks held by getty/5588:
 #0: ffff8880322210a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002fde2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0xfba/0x1480 drivers/tty/n_tty.c:2211
2 locks held by kworker/u8:11/8199:
3 locks held by kworker/u8:12/8854:
 #0: ffff88801beeb948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3213
 #1: ffffc9000391fd18 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3214
 #2: ffffffff8fee1b10 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xca/0xb30 net/core/net_namespace.c:606
6 locks held by kworker/0:0/17461:
 #0: ffff888020eb1148 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3213
 #1: ffffc90004d9fd18 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3214
 #2: ffff8881457a6190 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1030 [inline]
 #2: ffff8881457a6190 (&dev->mutex){....}-{4:4}, at: hub_event+0x1c1/0x4f80 drivers/usb/core/hub.c:5861
 #3: ffff8881457b9510 (&port_dev->status_lock){+.+.}-{4:4}, at: usb_lock_port drivers/usb/core/hub.c:3220 [inline]
 #3: ffff8881457b9510 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_port_connect drivers/usb/core/hub.c:5430 [inline]
 #3: ffff8881457b9510 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_port_connect_change drivers/usb/core/hub.c:5673 [inline]
 #3: ffff8881457b9510 (&port_dev->status_lock){+.+.}-{4:4}, at: port_event drivers/usb/core/hub.c:5833 [inline]
 #3: ffff8881457b9510 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_event+0x2910/0x4f80 drivers/usb/core/hub.c:5915
 #4: ffff888145397a68 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_port_connect drivers/usb/core/hub.c:5431 [inline]
 #4: ffff888145397a68 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_port_connect_change drivers/usb/core/hub.c:5673 [inline]
 #4: ffff888145397a68 (hcd->address0_mutex){+.+.}-{4:4}, at: port_event drivers/usb/core/hub.c:5833 [inline]
 #4: ffff888145397a68 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_event+0x2936/0x4f80 drivers/usb/core/hub.c:5915
 #5: ffffffff8f4e8f70 (ehci_cf_port_reset_rwsem){.+.+}-{4:4}, at: hub_port_reset+0x1a5/0x1cd0 drivers/usb/core/hub.c:3035
1 lock held by syz-executor/18354:
 #0: ffff8880b873ad98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:595
4 locks held by udevd/24526:
 #0: ffff88805b02b668 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xd8/0x12d0 fs/seq_file.c:182
 #1: ffff88805cc36c88 (&of->mutex#2){+.+.}-{4:4}, at: kernfs_seq_start+0x4d/0x240 fs/kernfs/file.c:154
 #2: ffff88805d451c38 (kn->active#5){++++}-{0:0}, at: kernfs_seq_start+0x71/0x240 fs/kernfs/file.c:155
 #3: ffff888028325190 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1030 [inline]
 #3: ffff888028325190 (&dev->mutex){....}-{4:4}, at: uevent_show+0x188/0x3b0 drivers/base/core.c:2730
3 locks held by syz.2.3688/26200:
 #0: ffff88805dcf51c0 (&tty->legacy_mutex){+.+.}-{4:4}, at: __tty_hangup.part.0+0xb8/0x890 drivers/tty/tty_io.c:584
 #1: ffff88805dcf50a0 (&tty->ldisc_sem){++++}-{0:0}, at: __tty_ldisc_lock drivers/tty/tty_ldisc.c:289 [inline]
 #1: ffff88805dcf50a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_lock+0x65/0xb0 drivers/tty/tty_ldisc.c:313
 #2: ffffffff8e1c9780 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x48/0x700 kernel/rcu/tree.c:3774
1 lock held by syz.1.3690/26214:
 #0: ffffffff8e1c9780 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x48/0x700 kernel/rcu/tree.c:3774

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.14.0-syzkaller-00826-g327ecdbc0fda #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 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:158 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:236 [inline]
 watchdog+0xf62/0x12b0 kernel/hung_task.c:399
 kthread+0x3af/0x750 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 17461 Comm: kworker/0:0 Not tainted 6.14.0-syzkaller-00826-g327ecdbc0fda #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: usb_hub_wq hub_event
RIP: 0010:kasan_check_range+0xf6/0x1a0 mm/kasan/generic.c:190
Code: 00 00 00 48 85 d2 74 1e 41 83 e2 07 49 39 d1 75 0a 45 3a 11 b8 01 00 00 00 7c 0b 44 89 c2 e8 c1 ec ff ff 83 f0 01 5b 5d 41 5c <c3> cc cc cc cc 48 85 d2 74 4f 48 01 ea eb 09 48 83 c0 01 48 39 d0
RSP: 0018:ffffc90004d9ec40 EFLAGS: 00000293
RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff8b56195b
RDX: fffffbfff16dbce4 RSI: 0000000000000001 RDI: ffffffff8b6de724
RBP: ffffffff8b6de724 R08: 0000000000000000 R09: fffffbfff16dbce4
R10: 0000000000000004 R11: 0000000000053354 R12: ffffc90004d9ef55
R13: 000000007ffffff8 R14: 0000000000000400 R15: ffffffff8b6de724
FS:  0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2ff9ba CR3: 000000006e224000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 __asan_memcpy+0x23/0x60 mm/kasan/shadow.c:105
 vsnprintf+0x69b/0x1180 lib/vsprintf.c:2802
 sprintf+0xcd/0x110 lib/vsprintf.c:3013
 print_caller kernel/printk/printk.c:1392 [inline]
 info_print_prefix+0x147/0x350 kernel/printk/printk.c:1409
 record_print_text+0x141/0x400 kernel/printk/printk.c:1456
 printk_get_next_message+0x2be/0x690 kernel/printk/printk.c:3006
 console_emit_next_record kernel/printk/printk.c:3074 [inline]
 console_flush_all+0x6ec/0xc60 kernel/printk/printk.c:3208
 __console_flush_and_unlock kernel/printk/printk.c:3267 [inline]
 console_unlock+0xd9/0x210 kernel/printk/printk.c:3307
 vprintk_emit+0x424/0x6f0 kernel/printk/printk.c:2432
 dev_vprintk_emit drivers/base/core.c:4891 [inline]
 dev_printk_emit+0xfb/0x140 drivers/base/core.c:4902
 __dev_printk+0xf5/0x270 drivers/base/core.c:4914
 _dev_notice+0xe5/0x120 drivers/base/core.c:4959
 usb_parse_interface drivers/usb/core/config.c:600 [inline]
 usb_parse_configuration drivers/usb/core/config.c:802 [inline]
 usb_get_configuration+0x345a/0x5e50 drivers/usb/core/config.c:951
 usb_enumerate_device drivers/usb/core/hub.c:2495 [inline]
 usb_new_device+0x11af/0x1a20 drivers/usb/core/hub.c:2633
 hub_port_connect drivers/usb/core/hub.c:5533 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5673 [inline]
 port_event drivers/usb/core/hub.c:5833 [inline]
 hub_event+0x2ec1/0x4f80 drivers/usb/core/hub.c:5915
 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x6c8/0xf00 kernel/workqueue.c:3400
 kthread+0x3af/0x750 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>