BUG: soft lockup in usbdev

ID	Workflow	Correct	Bug	Created	Started	Finished	Revision	Error
68f62be5-8331-4673-b1d0-5cc730c13046	assessment-security	💥	BUG: soft lockup in usbdev_ioctl	2026/07/20 00:00	2026/07/20 00:00	2026/07/20 00:23	72524a6625c995608a7d179201dff2195b8d1f66	failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=arm64" "CROSS_COMPILE=aarch64-linux-gnu-" "CC=ccache clang" "LD=ld.lld" "O=/app/work... truncated to first 200 bytes; open job for full error
10af1dbd-9707-4d1f-88c2-e9ef043949eb	assessment-security	💥	BUG: soft lockup in usbdev_ioctl	2026/07/17 00:01	2026/07/17 00:01	2026/07/17 00:31	49f47391518e9cfe0cedbef0d8259b0041150b4f	failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=arm64" "CROSS_COMPILE=aarch64-linux-gnu-" "CC=ccache clang" "LD=ld.lld" "O=/app/work... truncated to first 200 bytes; open job for full error
fc5b9b85-120d-4928-94c6-a16c19521453	assessment-security	💥	BUG: soft lockup in usbdev_ioctl	2026/07/15 00:03	2026/07/15 00:03	2026/07/15 00:29	2130f682322a1c2ef698e3c27a2b97e89e96142f	failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=arm64" "CROSS_COMPILE=aarch64-linux-gnu-" "CC=ccache clang" "LD=ld.lld" "O=/app/work... truncated to first 200 bytes; open job for full error

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	INFO: rcu detected stall in usbdev_ioctl (2) kernel	1				1	1682d	1682d	0/29	closed as invalid on 2022/02/08 10:10
upstream	INFO: rcu detected stall in usbdev_ioctl (3) kernel	1				2	573d	586d	0/29	auto-obsoleted due to no activity on 2025/03/23 18:26

Kernel

Title

Rank 🛈

upstream

INFO: rcu detected stall in usbdev_ioctl (2) kernel

1682d

0/29

closed as invalid on 2022/02/08 10:10

upstream

INFO: rcu detected stall in usbdev_ioctl (3) kernel

573d

586d

0/29

auto-obsoleted due to no activity on 2025/03/23 18:26

watchdog: BUG: soft lockup - CPU#0 stuck for 50s! [syz.6.1930:12307] Modules linked in: irq event stamp: 113 hardirqs last enabled at (113): [<ffff8000868e46ac>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline] hardirqs last enabled at (113): [<ffff8000868e46ac>] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:198 hardirqs last disabled at (112): [<ffff8000868e44dc>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:130 [inline] hardirqs last disabled at (112): [<ffff8000868e44dc>] _raw_spin_lock_irqsave+0x2c/0x7c kernel/locking/spinlock.c:166 softirqs last enabled at (24): [<ffff800080139980>] local_bh_enable include/linux/bottom_half.h:33 [inline] softirqs last enabled at (24): [<ffff800080139980>] put_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:251 [inline] softirqs last enabled at (24): [<ffff800080139980>] do_sve_acc+0x32c/0x4b8 arch/arm64/kernel/fpsimd.c:1349 softirqs last disabled at (22): [<ffff800080139760>] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last disabled at (22): [<ffff800080139760>] get_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:234 [inline] softirqs last disabled at (22): [<ffff800080139760>] do_sve_acc+0x10c/0x4b8 arch/arm64/kernel/fpsimd.c:1325 CPU: 0 UID: 0 PID: 12307 Comm: syz.6.1930 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/02/2026 pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : lock_acquire+0x16c/0x364 arch/arm64/include/asm/irqflags.h:-1 lr : lockdep_recursion_finish kernel/locking/lockdep.c:470 [inline] lr : lock_acquire+0x14c/0x364 kernel/locking/lockdep.c:5870 sp : ffff800097997660 x29: ffff8000979976b0 x28: 0000000000000000 x27: 0000000000000000 x26: ffff800088a712f0 x25: 0000000000000000 x24: 0000000000000001 x23: 0000000000000000 x22: ffff0000c1919210 x21: ffff800080efd3c4 x20: 0000000000000000 x19: 0000000000000000 x18: 00000000ffffffff x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000001 x12: ffff0000e3b3d7c0 x11: 0000000000003d4e x10: 0000000000000003 x9 : 0000000000000000 x8 : 00000000000000c0 x7 : 0000000000000000 x6 : ffff80008048ce60 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff80008049d250 x2 : 0000000100000000 x1 : ffff0000e3b3d7c0 x0 : 0000000000000000 Call trace: __daif_local_irq_restore arch/arm64/include/asm/irqflags.h:175 [inline] (P) arch_local_irq_restore arch/arm64/include/asm/irqflags.h:195 [inline] (P) lock_acquire+0x16c/0x364 kernel/locking/lockdep.c:5871 (P) down_write+0x50/0xc0 kernel/locking/rwsem.c:1631 __kernfs_remove+0x174/0x718 fs/kernfs/dir.c:1558 kernfs_remove_by_name_ns+0x70/0xd0 fs/kernfs/dir.c:1797 kernfs_remove_by_name include/linux/kernfs.h:644 [inline] sysfs_remove_link+0x5c/0x6c fs/sysfs/symlink.c:152 unlink_peers drivers/usb/core/port.c:606 [inline] usb_hub_remove_port_device+0x1ac/0x268 drivers/usb/core/port.c:860 hub_disconnect+0x120/0x358 drivers/usb/core/hub.c:1823 usb_unbind_interface+0x180/0x6d4 drivers/usb/core/driver.c:458 device_remove+0x114/0x134 drivers/base/dd.c:618 __device_release_driver drivers/base/dd.c:1349 [inline] device_release_driver_internal+0x124/0x20c drivers/base/dd.c:1372 device_release_driver+0x28/0x38 drivers/base/dd.c:1395 usb_driver_release_interface+0x10c/0x178 drivers/usb/core/driver.c:640 proc_disconnect_claim+0x2b4/0x330 drivers/usb/core/devio.c:2491 usbdev_do_ioctl drivers/usb/core/devio.c:2782 [inline] usbdev_ioctl+0xe0c/0x1990 drivers/usb/core/devio.c:2826 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __arm64_sys_ioctl+0x14c/0x1c4 fs/ioctl.c:583 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:736 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 26 Comm: kworker/1:1 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/02/2026 Workqueue: events jump_label_update_timeout pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : csd_lock_wait kernel/smp.c:342 [inline] pc : smp_call_function_many_cond+0xfd0/0x1640 kernel/smp.c:892 lr : csd_lock_wait kernel/smp.c:342 [inline] lr : smp_call_function_many_cond+0xfe8/0x1640 kernel/smp.c:892 sp : ffff80008ed078e0 x29: ffff80008ed079c0 x28: 0000000000000011 x27: 0000000000000000 x26: ffff0001adead980 x25: ffff800088acb6a0 x24: ffffffffffffffff x23: 1fffe00035bd5b30 x22: dfff800000000000 x21: 1fffe00035bd5b31 x20: ffff0001adead988 x19: ffff0001ade8ee08 x18: 00000000fe6a6f74 x17: 0000000000000000 x16: 0000000000000001 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: ffff600035bd1dc2 x9 : 0000000000000000 x8 : 0000000000000011 x7 : 0000000000000000 x6 : ffff80008016a448 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000805b79b8 x2 : 0000000000000000 x1 : ffff0000c1b29d40 x0 : 0000000000000000 Call trace: __cmpwait_case_32 arch/arm64/include/asm/cmpxchg.h:233 [inline] (P) __cmpwait arch/arm64/include/asm/cmpxchg.h:259 [inline] (P) csd_lock_wait kernel/smp.c:342 [inline] (P) smp_call_function_many_cond+0xfd0/0x1640 kernel/smp.c:892 (P) smp_call_function_many kernel/smp.c:915 [inline] smp_call_function+0x58/0xbc kernel/smp.c:935 kick_all_cpus_sync+0x28/0x34 kernel/smp.c:1081 arch_jump_label_transform_apply+0x14/0x20 arch/arm64/kernel/jump_label.c:34 __jump_label_update+0x31c/0x344 kernel/jump_label.c:521 jump_label_update+0x428/0x4b8 kernel/jump_label.c:910 __static_key_slow_dec_cpuslocked+0xc4/0x138 kernel/jump_label.c:315 __static_key_slow_dec kernel/jump_label.c:321 [inline] jump_label_update_timeout+0x28/0x3c kernel/jump_label.c:329 process_one_work kernel/workqueue.c:3322 [inline] process_scheduled_works+0x788/0x10b8 kernel/workqueue.c:3405 worker_thread+0x798/0xbd0 kernel/workqueue.c:3486 kthread+0x304/0x3d4 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:842 IPVS: fo: UDP 224.0.0.2:0 - no destination available IPVS: fo: UDP 224.0.0.2:0 - no destination available IPVS: fo: UDP 224.0.0.2:0 - no destination available

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/07/13 09:19	git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci	a52d6c7160f7	a870962e	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci-upstream-gce-arm64	BUG: soft lockup in usbdev_ioctl

Crashes (1):

Assets (help?)