syzbot


BUG: sleeping function called from invalid context in mon_complete

Status: upstream: reported on 2025/09/13 01:58
Subsystems: usb
[Documentation on labels]
Reported-by: syzbot+205ef33a3b636b4181fb@syzkaller.appspotmail.com
Fix commit: usbip: Fix locking bug in RT-enabled kernels
Patched on: [ci2-upstream-usb], missing on: [ci-qemu-gce-upstream-auto ci-qemu-native-arm64-kvm ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 ci-snapshot-upstream-root ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64 ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci-upstream-rust-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce]
First crash: 30d, last: 1d06h
Discussions (2)
Title Replies (including bot) Last reply
[PATCH] usb: mon: Make mon_bus::lock a raw spinlock 7 (7) 2025/09/17 16:35
[syzbot] [usb?] BUG: sleeping function called from invalid context in mon_complete 0 (1) 2025/09/13 01:58

Sample crash report:
usb 42-1: SetAddress Request (2) to port 0
BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48
in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 13484, name: kworker/0:0
preempt_count: 0, expected: 0
RCU nest depth: 0, expected: 0
6 locks held by kworker/0:0/13484:
 #0: ffff888020ae4d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3238 [inline]
 #0: ffff888020ae4d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0 kernel/workqueue.c:3346
 #1: ffffc90004ba7ba0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3239 [inline]
 #1: ffffc90004ba7ba0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0 kernel/workqueue.c:3346
 #2: ffff888146b98188 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:914 [inline]
 #2: ffff888146b98188 (&dev->mutex){....}-{4:4}, at: hub_event+0x184/0x4a20 drivers/usb/core/hub.c:5898
 #3: ffff888146b9c5b8 (&port_dev->status_lock){+.+.}-{4:4}, at: usb_lock_port drivers/usb/core/hub.c:3251 [inline]
 #3: ffff888146b9c5b8 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_port_connect drivers/usb/core/hub.c:5463 [inline]
 #3: ffff888146b9c5b8 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_port_connect_change drivers/usb/core/hub.c:5706 [inline]
 #3: ffff888146b9c5b8 (&port_dev->status_lock){+.+.}-{4:4}, at: port_event drivers/usb/core/hub.c:5870 [inline]
 #3: ffff888146b9c5b8 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_event+0x21b8/0x4a20 drivers/usb/core/hub.c:5952
 #4: ffff888027fa7e58 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_port_connect drivers/usb/core/hub.c:5464 [inline]
 #4: ffff888027fa7e58 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_port_connect_change drivers/usb/core/hub.c:5706 [inline]
 #4: ffff888027fa7e58 (hcd->address0_mutex){+.+.}-{4:4}, at: port_event drivers/usb/core/hub.c:5870 [inline]
 #4: ffff888027fa7e58 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_event+0x21e5/0x4a20 drivers/usb/core/hub.c:5952
 #5: ffff888028bca468 (&mbus->lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:44 [inline]
 #5: ffff888028bca468 (&mbus->lock){+.+.}-{3:3}, at: mon_bus_complete drivers/usb/mon/mon_main.c:134 [inline]
 #5: ffff888028bca468 (&mbus->lock){+.+.}-{3:3}, at: mon_complete+0x5c/0x200 drivers/usb/mon/mon_main.c:147
irq event stamp: 2668882
hardirqs last  enabled at (2668881): [<ffffffff8ac8f235>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
hardirqs last  enabled at (2668881): [<ffffffff8ac8f235>] _raw_spin_unlock_irqrestore+0x85/0x110 kernel/locking/spinlock.c:194
hardirqs last disabled at (2668882): [<ffffffff86e6a15f>] vhci_urb_enqueue+0xb5f/0xee0 drivers/usb/usbip/vhci_hcd.c:839
softirqs last  enabled at (2666708): [<ffffffff81843983>] __local_bh_enable_ip+0x1b3/0x2e0 kernel/softirq.c:305
softirqs last disabled at (2666702): [<ffffffff85b9f85d>] wg_packet_decrypt_worker+0xcd/0xce0 drivers/net/wireguard/receive.c:-1
CPU: 0 UID: 0 PID: 13484 Comm: kworker/0:0 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Workqueue: usb_hub_wq hub_event
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 __might_resched+0x44b/0x5d0 kernel/sched/core.c:8925
 __rt_spin_lock kernel/locking/spinlock_rt.c:48 [inline]
 rt_spin_lock+0xc7/0x3e0 kernel/locking/spinlock_rt.c:57
 spin_lock include/linux/spinlock_rt.h:44 [inline]
 mon_bus_complete drivers/usb/mon/mon_main.c:134 [inline]
 mon_complete+0x5c/0x200 drivers/usb/mon/mon_main.c:147
 usbmon_urb_complete include/linux/usb/hcd.h:738 [inline]
 __usb_hcd_giveback_urb+0x251/0x5e0 drivers/usb/core/hcd.c:1647
 vhci_urb_enqueue+0xb82/0xee0 drivers/usb/usbip/vhci_hcd.c:840
 usb_hcd_submit_urb+0x31d/0x1a80 drivers/usb/core/hcd.c:1546
 usb_start_wait_urb+0x114/0x4c0 drivers/usb/core/message.c:59
 usb_internal_control_msg drivers/usb/core/message.c:103 [inline]
 usb_control_msg+0x232/0x3e0 drivers/usb/core/message.c:154
 hub_set_address drivers/usb/core/hub.c:4769 [inline]
 hub_port_init+0xe24/0x2800 drivers/usb/core/hub.c:5074
 hub_port_connect drivers/usb/core/hub.c:5495 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5706 [inline]
 port_event drivers/usb/core/hub.c:5870 [inline]
 hub_event+0x2532/0x4a20 drivers/usb/core/hub.c:5952
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4b9/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
usb 42-1: new SuperSpeed USB device number 2 using vhci_hcd
usb 42-1: device descriptor read/8, error -110
usb usb42-port1: attempt power cycle
usb usb42-port1: unable to enumerate USB device

Crashes (10):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/10/07 21:59 upstream 971199ad2a0f 8ef35d49 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: sleeping function called from invalid context in mon_complete
2025/09/28 16:06 upstream 51a24b7deaae 001c9061 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: sleeping function called from invalid context in mon_complete
2025/09/28 16:02 upstream 51a24b7deaae 001c9061 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: sleeping function called from invalid context in mon_complete
2025/09/22 08:53 upstream 2d5bd41a4505 67c37560 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: sleeping function called from invalid context in mon_complete
2025/09/22 08:42 upstream 2d5bd41a4505 67c37560 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: sleeping function called from invalid context in mon_complete
2025/09/22 08:35 upstream 2d5bd41a4505 67c37560 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: sleeping function called from invalid context in mon_complete
2025/09/18 23:55 upstream cbf658dd0941 e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: sleeping function called from invalid context in mon_complete
2025/09/09 13:53 upstream f777d1112ee5 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: sleeping function called from invalid context in mon_complete
2025/09/09 02:00 upstream f777d1112ee5 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: sleeping function called from invalid context in mon_complete
2025/09/09 01:57 upstream f777d1112ee5 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root BUG: sleeping function called from invalid context in mon_complete
* Struck through repros no longer work on HEAD.