Hello, syzbot found the following issue on: HEAD commit: 07b887f8236e xhci: add helper to stop endpoint and wait fo.. git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing console output: https://syzkaller.appspot.com/x/log.txt?x=17629830580000 kernel config: https://syzkaller.appspot.com/x/.config?x=9878fe11046ea2c6 dashboard link: https://syzkaller.appspot.com/bug?extid=d6e9e199299dade9c496 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/c447438ae517/disk-07b887f8.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/1430abb44ca1/vmlinux-07b887f8.xz kernel image: https://storage.googleapis.com/syzbot-assets/53e62be3705b/bzImage-07b887f8.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d6e9e199299dade9c496@xxxxxxxxxxxxxxxxxxxxxxxxx INFO: task kworker/1:4:4968 blocked for more than 143 seconds. Not tainted 6.12.0-rc3-syzkaller-00051-g07b887f8236e #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:4 state:D stack:20512 pid:4968 tgid:4968 ppid:2 flags:0x00004000 Workqueue: events_freezable usb_stor_scan_dwork Call Trace: <TASK> context_switch kernel/sched/core.c:5322 [inline] __schedule+0x105f/0x34b0 kernel/sched/core.c:6682 __schedule_loop kernel/sched/core.c:6759 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6774 blk_mq_freeze_queue_wait+0x146/0x190 block/blk-mq.c:139 blk_freeze_queue block/blk-mq.c:166 [inline] blk_mq_freeze_queue block/blk-mq.c:175 [inline] blk_mq_update_tag_set_shared+0xba/0x160 block/blk-mq.c:4035 blk_mq_add_queue_tag_set block/blk-mq.c:4069 [inline] blk_mq_init_allocated_queue+0xd59/0x11f0 block/blk-mq.c:4343 blk_mq_alloc_queue+0x1f8/0x2f0 block/blk-mq.c:4158 scsi_alloc_sdev+0x897/0xd90 drivers/scsi/scsi_scan.c:337 scsi_probe_and_add_lun+0x525/0x7b0 drivers/scsi/scsi_scan.c:1210 scsi_sequential_lun_scan drivers/scsi/scsi_scan.c:1393 [inline] __scsi_scan_target+0x42c/0x4e0 drivers/scsi/scsi_scan.c:1764 scsi_scan_channel drivers/scsi/scsi_scan.c:1845 [inline] scsi_scan_channel+0x149/0x1e0 drivers/scsi/scsi_scan.c:1821 scsi_scan_host_selected+0x2ae/0x370 drivers/scsi/scsi_scan.c:1874 do_scsi_scan_host+0x1ef/0x260 drivers/scsi/scsi_scan.c:2013 scsi_scan_host drivers/scsi/scsi_scan.c:2043 [inline] scsi_scan_host+0x3a7/0x440 drivers/scsi/scsi_scan.c:2031 usb_stor_scan_dwork+0xad/0x280 drivers/usb/storage/usb.c:998 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 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/0:1/9: #0: ffff888105adf548 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x129b/0x1ba0 kernel/workqueue.c:3204 #1: ffffc9000009fd80 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3205 #2: ffff888109b4b190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1014 [inline] #2: ffff888109b4b190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1be/0x4f40 drivers/usb/core/hub.c:5849 #3: ffff88811d170190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1014 [inline] (&dev->mutex){....}-{3:3}, at: __device_attach+0x7f/0x4b0 drivers/base/dd.c:1005 #4: ffff888118050160 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1014 [inline] #4: ffff888118050160 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7f/0x4b0 drivers/base/dd.c:1005 #5: ffff8881328e8d20 (&dev->phy_mutex){+.+.}-{3:3}, at: mcs7830_write_phy+0xa6/0x2d0 drivers/net/usb/mcs7830.c:227 4 locks held by kworker/u8:0/11: #0: ffff888100abf948 ((wq_completion)async){+.+.}-{0:0}, at: process_one_work+0x129b/0x1ba0 kernel/workqueue.c:3204 #1: ffffc900000bfd80 ((work_completion)(&entry->work)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3205 #2: ffff888105b36378 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1014 [inline] #2: ffff888105b36378 (&dev->mutex){....}-{3:3}, at: __device_attach_async_helper+0x84/0x290 drivers/base/dd.c:973 #3: ffff888105f9bd60 (&q->limits_lock){+.+.}-{3:3}, at: queue_limits_start_update include/linux/blkdev.h:926 [inline] #3: ffff888105f9bd60 (&q->limits_lock){+.+.}-{3:3}, at: sd_revalidate_disk.isra.0+0x27a/0xa420 drivers/scsi/sd.c:3727 1 lock held by khungtaskd/30: #0: ffffffff88ebb100 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff88ebb100 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff88ebb100 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6720 2 locks held by getty/2607: #0: ffff888108afe0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc900000432f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfba/0x1480 drivers/tty/n_tty.c:2211 4 locks held by udevd/4907: #0: ffff8881327c30a0 (&p->lock){+.+.}-{3:3}, at: seq_read_iter+0xd8/0x12b0 fs/seq_file.c:182 #1: ffff88811c18e888 (&of->mutex){+.+.}-{3:3}, at: kernfs_seq_start+0x4d/0x240 fs/kernfs/file.c:154 #2: ffff88812ea73e18 (kn->active#18){++++}-{0:0}, at: kernfs_seq_start+0x71/0x240 fs/kernfs/file.c:155 #3: ffff88811cb6f190 (&dev->mutex){....}-{3:3} , at: device_lock_interruptible include/linux/device.h:1019 [inline] , at: manufacturer_show+0x26/0xa0 drivers/usb/core/sysfs.c:142 5 locks held by kworker/0:4/4927: 4 locks held by udevd/4962: #0: ffff88811bafcd58 (&p->lock){+.+.}-{3:3}, at: seq_read_iter+0xd8/0x12b0 fs/seq_file.c:182 #1: ffff888118208c88 (&of->mutex){+.+.}-{3:3}, at: kernfs_seq_start+0x4d/0x240 fs/kernfs/file.c:154 #2: ffff888116fd1e18 (kn->active#18){++++}-{0:0}, at: kernfs_seq_start+0x71/0x240 fs/kernfs/file.c:155 #3: ffff888118647190 (&dev->mutex){....}-{3:3}, at: device_lock_interruptible include/linux/device.h:1019 [inline] #3: ffff888118647190 (&dev->mutex){....}-{3:3}, at: manufacturer_show+0x26/0xa0 drivers/usb/core/sysfs.c:142 4 locks held by kworker/1:4/4968: #0: ffff888100081548 ((wq_completion)events_freezable){+.+.}-{0:0}, at: process_one_work+0x129b/0x1ba0 kernel/workqueue.c:3204 #1: ffffc90002f77d80 ((work_completion)(&(&us->scan_dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3205 #2: ffff88811f2c40e0 (&shost->scan_mutex){+.+.}-{3:3}, at: scsi_scan_host_selected+0x160/0x370 drivers/scsi/scsi_scan.c:1866 #3: ffff88811f2c42d0 (&set->tag_list_lock){+.+.}-{3:3}, at: blk_mq_add_queue_tag_set block/blk-mq.c:4060 [inline] #3: ffff88811f2c42d0 (&set->tag_list_lock){+.+.}-{3:3}, at: blk_mq_init_allocated_queue+0x7bc/0x11f0 block/blk-mq.c:4343 2 locks held by kworker/u8:1/8285: #0: ffff88811b967148 ((wq_completion)scsi_tmf_1){+.+.}-{0:0}, at: process_one_work+0x129b/0x1ba0 kernel/workqueue.c:3204 #1: ffffc90011d47d80 ((work_completion)(&(&cmd->abort_work)->work)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3205 6 locks held by kworker/1:2/9465: 5 locks held by kworker/1:3/19696: #0: ffff888105adf548 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x129b/0x1ba0 kernel/workqueue.c:3204 #1: ffffc9000662fd80 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3205 #2: ffff88810978b190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1014 [inline] #2: ffff88810978b190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1be/0x4f40 drivers/usb/core/hub.c:5849 #3: ffff88810bfd9190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1014 [inline] #3: ffff88810bfd9190 (&dev->mutex){....}-{3:3}, at: usb_disconnect+0x10a/0x920 drivers/usb/core/hub.c:2295 #4: ffff8881323cb160 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1014 [inline] #4: ffff8881323cb160 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1095 [inline] #4: ffff8881323cb160 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xa4/0x610 drivers/base/dd.c:1293 1 lock held by usb-storage/21984: #0: ffff88811f2c4d08 (&us_interface_key[i]){+.+.}-{3:3}, at: usb_stor_control_thread+0xd6/0xac0 drivers/usb/storage/usb.c:394 5 locks held by kworker/1:5/22023: 1 lock held by syz.0.4668/23009: #0: ffffffff88ec69f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock+0x1a4/0x3b0 kernel/rcu/tree_exp.h:329 1 lock held by syz.4.4669/23011: #0: ffffffff88ec69f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock+0x1a4/0x3b0 kernel/rcu/tree_exp.h:329 ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc3-syzkaller-00051-g07b887f8236e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 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:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline] watchdog+0xf0c/0x1240 kernel/hung_task.c:379 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 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: 0 Comm: swapper/0 Not tainted 6.12.0-rc3-syzkaller-00051-g07b887f8236e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:rol32 include/linux/bitops.h:127 [inline] RIP: 0010:iterate_chain_key kernel/locking/lockdep.c:448 [inline] RIP: 0010:__lock_acquire+0xc4e/0x3ce0 kernel/locking/lockdep.c:5190 Code: d8 8b 5c 24 68 89 c2 29 c1 c1 c2 06 31 ca 01 d8 29 d3 89 d9 89 d3 01 c2 c1 c3 08 31 cb 89 d9 29 d8 01 d3 c1 c1 10 89 de 31 c8 <89> c1 29 c2 01 d8 c1 c9 0d 31 d1 89 ca 29 ce 01 c8 c1 c2 04 89 c0 RSP: 0018:ffffc900000078c8 EFLAGS: 00000082 RAX: 00000000ebe4eeae RBX: 00000000ff533bd4 RCX: 00000000eb48ff53 RDX: 00000000ffff508c RSI: 00000000ff533bd4 RDI: ffffffff8fad10f8 RBP: 0000000000000022 R08: 0000000000000000 R09: fffffbfff1f55dbe R10: ffffffff8faaedf7 R11: 0000000000000000 R12: 0000000000000001 R13: ffffffff88c2d258 R14: 0000000000000002 R15: ffffffff88c2c7c0 FS: 0000000000000000(0000) GS:ffff8881f5800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555574e294a8 CR3: 0000000120378000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <NMI> </NMI> <IRQ> lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5825 local_lock_acquire include/linux/local_lock_internal.h:29 [inline] kcov_remote_stop+0x8e/0x5f0 kernel/kcov.c:1007 kcov_remote_stop_softirq include/linux/kcov.h:98 [inline] __usb_hcd_giveback_urb+0x4d9/0x6e0 drivers/usb/core/hcd.c:1651 usb_hcd_giveback_urb+0x396/0x450 drivers/usb/core/hcd.c:1734 dummy_timer+0x17c3/0x38d0 drivers/usb/gadget/udc/dummy_hcd.c:1988 __run_hrtimer kernel/time/hrtimer.c:1691 [inline] __hrtimer_run_queues+0x20a/0xae0 kernel/time/hrtimer.c:1755 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1772 handle_softirqs+0x206/0x8d0 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu kernel/softirq.c:637 [inline] irq_exit_rcu+0xac/0x110 kernel/softirq.c:649 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1037 [inline] sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1037 </IRQ> <TASK> 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+0x1a/0x20 drivers/acpi/processor_idle.c:112 Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 65 48 8b 05 b8 0b 15 79 48 8b 00 a8 08 75 0c 66 90 0f 00 2d c8 2e 61 00 fb f4 <fa> c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffffff88c07d70 EFLAGS: 00000246 RAX: 0000000000004000 RBX: 0000000000000001 RCX: ffffffff86ee9b79 RDX: 0000000000000001 RSI: ffff8881052a9800 RDI: ffff8881052a9864 RBP: ffff8881052a9864 R08: 0000000000000001 R09: ffffed103eb06fd9 R10: ffff8881f5837ecb R11: 0000000000000000 R12: ffff88810bec2000 R13: ffffffff89340ca0 R14: 0000000000000000 R15: 0000000000000000 acpi_idle_enter+0xc5/0x160 drivers/acpi/processor_idle.c:702 cpuidle_enter_state+0xaa/0x4f0 drivers/cpuidle/cpuidle.c:264 cpuidle_enter+0x4e/0xa0 drivers/cpuidle/cpuidle.c:385 cpuidle_idle_call kernel/sched/idle.c:230 [inline] do_idle+0x313/0x3f0 kernel/sched/idle.c:326 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:424 rest_init+0x16b/0x2b0 init/main.c:747 start_kernel+0x3df/0x4c0 init/main.c:1105 x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:507 x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:488 common_startup_64+0x12c/0x138 </TASK> --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
