INFO: task kworker/1:4:7185 blocked for more than 143 seconds. Not tainted 5.14.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:4 state:D stack:22800 pid: 7185 ppid: 2 flags:0x00004000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:4681 [inline] __schedule+0x941/0x22b0 kernel/sched/core.c:5938 schedule+0xcf/0x270 kernel/sched/core.c:6017 rwsem_down_write_slowpath+0x8e3/0x1190 kernel/locking/rwsem.c:1106 __down_write_common kernel/locking/rwsem.c:1261 [inline] __down_write_common kernel/locking/rwsem.c:1258 [inline] __down_write kernel/locking/rwsem.c:1270 [inline] down_write+0x137/0x150 kernel/locking/rwsem.c:1407 usb_deregister_dev+0xaa/0x320 drivers/usb/core/file.c:239 sisusb_disconnect+0x5a/0x200 drivers/usb/misc/sisusbvga/sisusb.c:3166 usb_unbind_interface+0x1d8/0x8d0 drivers/usb/core/driver.c:458 __device_release_driver+0x3bd/0x6f0 drivers/base/dd.c:1201 device_release_driver_internal drivers/base/dd.c:1232 [inline] device_release_driver+0x26/0x40 drivers/base/dd.c:1255 bus_remove_device+0x2eb/0x5a0 drivers/base/bus.c:529 device_del+0x502/0xd40 drivers/base/core.c:3543 usb_disable_device+0x35b/0x7b0 drivers/usb/core/message.c:1419 usb_disconnect.cold+0x27a/0x78e drivers/usb/core/hub.c:2225 hub_port_connect drivers/usb/core/hub.c:5199 [inline] hub_port_connect_change drivers/usb/core/hub.c:5488 [inline] port_event drivers/usb/core/hub.c:5634 [inline] hub_event+0x1c9c/0x4330 drivers/usb/core/hub.c:5716 process_one_work+0x98d/0x15b0 kernel/workqueue.c:2276 process_scheduled_works kernel/workqueue.c:2338 [inline] worker_thread+0x85c/0x11f0 kernel/workqueue.c:2424 kthread+0x3c0/0x4a0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Showing all locks held in the system: 1 lock held by khungtaskd/1211: #0: ffffffff8767e640 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x269 kernel/locking/lockdep.c:6446 1 lock held by in:imklog/4313: #0: ffff8881002739f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:974 2 locks held by agetty/4323: #0: ffff8881181ee098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:252 #1: ffffc900004fb2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2113 6 locks held by kworker/1:4/7185: #0: ffff888109fb9138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888109fb9138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:620 [inline] #0: ffff888109fb9138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff888109fb9138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:617 [inline] #0: ffff888109fb9138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: ffff888109fb9138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x871/0x15b0 kernel/workqueue.c:2247 #1: ffffc9000434fdb0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15b0 kernel/workqueue.c:2251 #2: ffff88810f8b6220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:756 [inline] #2: ffff88810f8b6220 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c1/0x4330 drivers/usb/core/hub.c:5662 #3: ffff888117a3d220 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:756 [inline] #3: ffff888117a3d220 (&dev->mutex){....}-{3:3}, at: usb_disconnect.cold+0x43/0x78e drivers/usb/core/hub.c:2216 #4: ffff8881510531a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:756 [inline] #4: ffff8881510531a8 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1028 [inline] #4: ffff8881510531a8 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal drivers/base/dd.c:1229 [inline] #4: ffff8881510531a8 (&dev->mutex){....}-{3:3}, at: device_release_driver+0x1c/0x40 drivers/base/dd.c:1255 #5: ffffffff87f7bd30 (minor_rwsem){++++}-{3:3}, at: usb_deregister_dev+0xaa/0x320 drivers/usb/core/file.c:239 2 locks held by syz-executor.4/11281: #0: ffffffff87f7bd30 (minor_rwsem){++++}-{3:3}, at: usb_open+0x24/0x2e0 drivers/usb/core/file.c:39 #1: ffff88814384b8d0 (&(sisusb->lock)){+.+.}-{3:3}, at: sisusb_open+0xb2/0x4d0 drivers/usb/misc/sisusbvga/sisusb.c:2396 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1211 Comm: khungtaskd Not tainted 5.14.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105 nmi_cpu_backtrace.cold+0x46/0xe0 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1da/0x200 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xcf4/0xf90 kernel/hung_task.c:295 kthread+0x3c0/0x4a0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 2650 Comm: systemd-journal Not tainted 5.14.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:update_cfs_group+0x1cb/0x240 kernel/sched/fair.c:3226 Code: 41 5c 41 5d 41 5e 41 5f e9 22 fa ff ff 48 99 48 f7 fb eb a5 48 c1 eb 0a b8 02 00 00 00 48 83 fb 02 48 0f 42 d8 e9 f3 fe ff ff <48> 83 c4 08 5b 5d 41 5c 41 5d 41 5e 41 5f c3 e8 d1 20 4e 00 e9 4f RSP: 0018:ffffc900002079b8 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: 0000000000000009 RCX: 0000000000000001 RDX: 1ffff11022a54043 RSI: 1ffff1103ed0a003 RDI: ffff8881152a0218 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff888f41d7 R10: fffffbfff111e83a R11: 0000000000000001 R12: ffff8881152a00c0 R13: ffff8881152a00f0 R14: dffffc0000000000 R15: ffff8881152a00c0 FS: 00007f74e96098c0(0000) GS:ffff8881f6800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f74e2d40000 CR3: 0000000108a46000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: dequeue_entity kernel/sched/fair.c:4394 [inline] dequeue_task_fair+0x334/0x1480 kernel/sched/fair.c:5666 dequeue_task kernel/sched/core.c:1967 [inline] deactivate_task kernel/sched/core.c:1981 [inline] __schedule+0xcaf/0x22b0 kernel/sched/core.c:5892 schedule+0xcf/0x270 kernel/sched/core.c:6017 schedule_hrtimeout_range_clock+0x359/0x3a0 kernel/time/hrtimer.c:2148 ep_poll fs/eventpoll.c:1848 [inline] do_epoll_wait+0x1283/0x1950 fs/eventpoll.c:2226 __do_sys_epoll_wait fs/eventpoll.c:2238 [inline] __se_sys_epoll_wait fs/eventpoll.c:2233 [inline] __x64_sys_epoll_wait+0x158/0x270 fs/eventpoll.c:2233 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f74e88d2303 Code: 49 89 ca b8 e8 00 00 00 0f 05 48 3d 01 f0 ff ff 73 34 c3 48 83 ec 08 e8 0b c2 00 00 48 89 04 24 49 89 ca b8 e8 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 51 c2 00 00 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007ffd2584db00 EFLAGS: 00000293 ORIG_RAX: 00000000000000e8 RAX: ffffffffffffffda RBX: 000055ddf483e1e0 RCX: 00007f74e88d2303 RDX: 0000000000000014 RSI: 00007ffd2584db10 RDI: 0000000000000008 RBP: 00007ffd2584dd00 R08: 000000006125bf90 R09: 00007ffd258ad080 R10: 00000000ffffffff R11: 0000000000000293 R12: 00007ffd2584db10 R13: 0000000000000001 R14: ffffffffffffffff R15: 0005ca5a3e43c630 ---------------- Code disassembly (best guess): 0: 41 5c pop %r12 2: 41 5d pop %r13 4: 41 5e pop %r14 6: 41 5f pop %r15 8: e9 22 fa ff ff jmpq 0xfffffa2f d: 48 99 cqto f: 48 f7 fb idiv %rbx 12: eb a5 jmp 0xffffffb9 14: 48 c1 eb 0a shr $0xa,%rbx 18: b8 02 00 00 00 mov $0x2,%eax 1d: 48 83 fb 02 cmp $0x2,%rbx 21: 48 0f 42 d8 cmovb %rax,%rbx 25: e9 f3 fe ff ff jmpq 0xffffff1d * 2a: 48 83 c4 08 add $0x8,%rsp <-- trapping instruction 2e: 5b pop %rbx 2f: 5d pop %rbp 30: 41 5c pop %r12 32: 41 5d pop %r13 34: 41 5e pop %r14 36: 41 5f pop %r15 38: c3 retq 39: e8 d1 20 4e 00 callq 0x4e210f 3e: e9 .byte 0xe9 3f: 4f rex.WRXB