syzbot

watchdog: BUG: soft lockup - CPU#0 stuck for 246s! [syz-executor:9347]
Modules linked in:

CPU: 0 PID: 9347 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
RIP: 0010:arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
RIP: 0010:kvm_wait+0x105/0x150 arch/x86/kernel/kvm.c:1064
Code: 07 33 04 f4 eb 87 fa 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 3f 0f b6 07 40 38 f0 75 10 66 90 0f 00 2d 5d 07 33 04 fb f4 <e9> 5e ff ff ff fb e9 58 ff ff ff e8 1b aa c4 03 89 f9 80 e1 07 38
RSP: 0018:ffffc90000757500 EFLAGS: 00000246

RAX: 0000000000000003 RBX: ffffffff8700d5c0 RCX: ffffffff8500b8a2
RDX: dffffc0000000000 RSI: 0000000000000003 RDI: ffffffff8700d5c0
RBP: ffffc90000757590 R08: ffffffff8700d5c0 R09: 1ffffffff0e01ab8
R10: dffffc0000000000 R11: fffffbfff0e01ab9 R12: 1ffff1103edc0001
R13: ffff8881f6e38cd4 R14: dffffc0000000000 R15: 1ffff920000eaea0
FS:  000055558911c500(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555589137908 CR3: 00000001197c0000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 pv_wait arch/x86/include/asm/paravirt.h:603 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
 __pv_queued_spin_lock_slowpath+0x690/0xc40 kernel/locking/qspinlock.c:511
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:591 [inline]
 queued_spin_lock_slowpath+0x47/0x50 arch/x86/include/asm/qspinlock.h:51
 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
 do_raw_spin_lock include/linux/spinlock.h:187 [inline]
 __raw_spin_lock include/linux/spinlock_api_smp.h:134 [inline]
 _raw_spin_lock+0xe4/0xf0 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:351 [inline]
 ilookup+0x87/0x1e0 fs/inode.c:1579
 blkdev_get_no_open+0x23/0xd0 block/bdev.c:765
 blkdev_get_by_dev+0x86/0x9f0 block/bdev.c:824
 blkdev_open+0x13e/0x300 block/fops.c:500
 do_dentry_open+0x88e/0x1260 fs/open.c:884
 vfs_open+0x73/0x80 fs/open.c:1017
 do_open fs/namei.c:3633 [inline]
 path_openat+0x2700/0x2f80 fs/namei.c:3790
 do_filp_open+0x1f1/0x430 fs/namei.c:3817
 do_sys_openat2+0x15e/0x810 fs/open.c:1343
 do_sys_open fs/open.c:1359 [inline]
 __do_sys_openat fs/open.c:1375 [inline]
 __se_sys_openat fs/open.c:1370 [inline]
 __x64_sys_openat+0x136/0x160 fs/open.c:1370
 x64_sys_call+0x783/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:258
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f79c4b57817
Code: 48 89 fa 4c 89 df e8 a8 56 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffe0b42f940 EFLAGS: 00000202
 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000055558911c500 RCX: 00007f79c4b57817
RDX: 0000000000000002 RSI: 00007ffe0b42fa70 RDI: ffffffffffffff9c
RBP: 00007ffe0b42fa1c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000044
R13: 00000000000927c0 R14: 00000000000539dc R15: 00007ffe0b42fa70
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
usb 5-1: eth1: intr status -71
NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: kworker/1:0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: usb_hub_wq hub_event
RIP: 0010:check_kcov_mode kernel/kcov.c:182 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x2e/0x60 kernel/kcov.c:216
Code: 48 8b 45 08 65 48 8b 0d b0 00 91 7e 65 8b 15 b1 00 91 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 6c 0b 00 00 00 <74> 2c 8b 91 48 0b 00 00 83 fa 02 75 21 48 8b 91 50 0b 00 00 48 8b
RSP: 0018:ffffc900001afdf0 EFLAGS: 00000002
RAX: ffffffff84f27e3a RBX: ffffc900001afe78 RCX: ffff888100339440
RDX: 0000000000000100 RSI: 00000000000272ec RDI: 00000000000272ed
RBP: ffffc900001afdf0 R08: ffff888100339440 R09: 0000000000000005
R10: 0000000000000030 R11: 0000000000000002 R12: 0000000000000036
R13: ffffffff856a0089 R14: ffffffff856a0089 R15: 0000000000000006
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000012650b000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 skip_atoi+0xfa/0x110 lib/vsprintf.c:169
 format_decode+0x874/0x1520 lib/vsprintf.c:2573
 vsnprintf+0xea/0x1990 lib/vsprintf.c:2757
 sprintf+0xe4/0x140 lib/vsprintf.c:3009
 print_time kernel/printk/printk.c:1276 [inline]
 info_print_prefix+0x168/0x360 kernel/printk/printk.c:1302
 record_print_text+0x173/0x440 kernel/printk/printk.c:1351
 console_emit_next_record+0x591/0xab0 kernel/printk/printk.c:2771
 console_flush_all kernel/printk/printk.c:-1 [inline]
 console_unlock+0x246/0x560 kernel/printk/printk.c:2917
 vprintk_emit+0x14d/0x420 kernel/printk/printk.c:2308
 dev_vprintk_emit+0x351/0x404 drivers/base/core.c:4934
 dev_printk_emit+0xeb/0x13c drivers/base/core.c:4945
 __dev_printk+0x17f/0x1b0 drivers/base/core.c:4957
 _dev_info+0x11b/0x16c drivers/base/core.c:5003
 intr_callback+0x4d4/0x600 drivers/net/usb/rtl8150.c:491
 __usb_hcd_giveback_urb+0x364/0x520 drivers/usb/core/hcd.c:1675
 usb_hcd_giveback_urb+0x11c/0x410 drivers/usb/core/hcd.c:1758
 dummy_timer+0x88c/0x2fd0 drivers/usb/gadget/udc/dummy_hcd.c:1994
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x3d5/0xa00 kernel/time/hrtimer.c:1749
 hrtimer_run_softirq+0x19b/0x260 kernel/time/hrtimer.c:1766
 handle_softirqs+0x1d7/0x600 kernel/softirq.c:642
 __do_softirq kernel/softirq.c:680 [inline]
 invoke_softirq kernel/softirq.c:497 [inline]
 __irq_exit_rcu+0x52/0xf0 kernel/softirq.c:729
 irq_exit_rcu+0x9/0x10 kernel/softirq.c:741
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0xa9/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:_compound_head include/linux/page-flags.h:261 [inline]
RIP: 0010:virt_to_folio include/linux/mm.h:1175 [inline]
RIP: 0010:virt_to_slab mm/slab.h:175 [inline]
RIP: 0010:qlink_to_cache mm/kasan/quarantine.c:131 [inline]
RIP: 0010:qlist_free_all+0x73/0x140 mm/kasan/quarantine.c:184
Code: 80 72 07 48 8b 05 5d c3 4a 05 4c 01 f8 48 2d 00 00 00 80 48 c1 e8 06 48 83 e0 c0 48 ba 00 00 00 00 00 ea ff ff 48 8b 4c 10 08 <f6> c1 01 75 59 48 01 d0 48 8b 08 48 c1 e1 36 48 c1 f9 3f 48 21 c1
RSP: 0018:ffffc900001974f8 EFLAGS: 00000206
RAX: 00000000043f0300 RBX: ffff88810fc0c800 RCX: ffffea00043f0201
RDX: ffffea0000000000 RSI: ffffea00043f0200 RDI: 0000000000000000
RBP: ffffc90000197530 R08: ffff88810fc08800 R09: 000000000010000c
R10: dffffc0000000000 R11: fffffbfff0f1cdc8 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88810fc0c800
 kasan_quarantine_reduce+0x14a/0x170 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x24/0x80 mm/kasan/common.c:311
 kasan_slab_alloc include/linux/kasan.h:202 [inline]
 slab_post_alloc_hook+0x4f/0x2d0 mm/slab.h:768
 slab_alloc_node mm/slub.c:3382 [inline]
 __kmem_cache_alloc_node+0x192/0x2c0 mm/slub.c:3423
 __do_kmalloc_node mm/slab_common.c:937 [inline]
 __kmalloc+0xa1/0x1e0 mm/slab_common.c:951
 kmalloc include/linux/slab.h:568 [inline]
 kzalloc include/linux/slab.h:699 [inline]
 rh_call_control drivers/usb/core/hcd.c:514 [inline]
 rh_urb_enqueue drivers/usb/core/hcd.c:848 [inline]
 usb_hcd_submit_urb+0x790/0x1830 drivers/usb/core/hcd.c:1556
 usb_submit_urb+0x1150/0x1820 drivers/usb/core/urb.c:596
 usb_start_wait_urb+0x124/0x300 drivers/usb/core/message.c:58
 usb_internal_control_msg drivers/usb/core/message.c:102 [inline]
 usb_control_msg+0x241/0x3f0 drivers/usb/core/message.c:153
 get_port_status drivers/usb/core/hub.c:609 [inline]
 hub_ext_port_status+0x100/0x6b0 drivers/usb/core/hub.c:626
 usb_hub_port_status drivers/usb/core/hub.c:648 [inline]
 hub_port_debounce+0x1c7/0x250 drivers/usb/core/hub.c:4717
 hub_port_debounce_be_stable drivers/usb/core/hub.h:181 [inline]
 hub_port_connect drivers/usb/core/hub.c:5445 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5734 [inline]
 port_event drivers/usb/core/hub.c:5898 [inline]
 hub_event+0x1ca8/0x46b0 drivers/usb/core/hub.c:5980
 process_one_work+0x71f/0xc40 kernel/workqueue.c:2302
 worker_thread+0xa29/0x11e0 kernel/workqueue.c:2449
 kthread+0x281/0x320 kernel/kthread.c:386
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
usb 5-1: eth1: intr status -71