netlink: 6 bytes leftover after parsing attributes in process `syz-executor.5'. BTRFS info (device loop0): disk space caching is enabled BTRFS info (device loop0): has skinny extents INFO: task kworker/1:4:8051 blocked for more than 140 seconds. Not tainted 4.14.258-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/1:4 D27216 8051 2 0x80000000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 usb_kill_urb.part.0+0x125/0x190 drivers/usb/core/urb.c:691 usb_kill_urb+0x7c/0x90 drivers/usb/core/urb.c:686 usb_start_wait_urb+0x209/0x440 drivers/usb/core/message.c:62 usb_internal_control_msg drivers/usb/core/message.c:100 [inline] usb_control_msg+0x302/0x450 drivers/usb/core/message.c:151 hub_port_init+0xf27/0x28b0 drivers/usb/core/hub.c:4599 hub_port_connect drivers/usb/core/hub.c:4954 [inline] hub_port_connect_change drivers/usb/core/hub.c:5144 [inline] port_event drivers/usb/core/hub.c:5250 [inline] hub_event+0x1948/0x3f60 drivers/usb/core/hub.c:5330 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 INFO: task syz-executor.2:30711 blocked for more than 140 seconds. Not tainted 4.14.258-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28304 30711 8015 0x00000104 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3489 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893 device_lock include/linux/device.h:1082 [inline] usbdev_open+0x142/0x790 drivers/usb/core/devio.c:1023 chrdev_open+0x23c/0x6d0 fs/char_dev.c:423 do_dentry_open+0x44b/0xec0 fs/open.c:777 vfs_open+0x105/0x220 fs/open.c:888 do_last fs/namei.c:3428 [inline] path_openat+0x628/0x2970 fs/namei.c:3569 do_filp_open+0x179/0x3c0 fs/namei.c:3603 do_sys_open+0x296/0x410 fs/open.c:1081 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f4ef5391db4 RSP: 002b:00007f4ef3d53ca0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 00007f4ef5391db4 RDX: 0000000000000001 RSI: 00007f4ef3d53d40 RDI: 00000000ffffff9c RBP: 00007f4ef3d53d40 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001 R13: 00007ffc4146971f R14: 00007f4ef3d54300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1532: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 1 lock held by in:imklog/7749: #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 fs/file.c:778 5 locks held by kworker/1:4/8051: #0: ("usb_hub_wq"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2088 #1: ((&hub->events)){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2092 #2: (&dev->mutex){....}, at: [] device_lock include/linux/device.h:1082 [inline] #2: (&dev->mutex){....}, at: [] hub_event+0x108/0x3f60 drivers/usb/core/hub.c:5276 #3: (&port_dev->status_lock){+.+.}, at: [] usb_lock_port drivers/usb/core/hub.c:2936 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] hub_port_connect drivers/usb/core/hub.c:4920 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] hub_port_connect_change drivers/usb/core/hub.c:5144 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] port_event drivers/usb/core/hub.c:5250 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] hub_event+0x15c0/0x3f60 drivers/usb/core/hub.c:5330 #4: (hcd->address0_mutex){+.+.}, at: [] hub_port_connect drivers/usb/core/hub.c:4921 [inline] #4: (hcd->address0_mutex){+.+.}, at: [] hub_port_connect_change drivers/usb/core/hub.c:5144 [inline] #4: (hcd->address0_mutex){+.+.}, at: [] port_event drivers/usb/core/hub.c:5250 [inline] #4: (hcd->address0_mutex){+.+.}, at: [] hub_event+0x15ea/0x3f60 drivers/usb/core/hub.c:5330 1 lock held by syz-executor.2/30711: #0: (&dev->mutex){....}, at: [] device_lock include/linux/device.h:1082 [inline] #0: (&dev->mutex){....}, at: [] usbdev_open+0x142/0x790 drivers/usb/core/devio.c:1023 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1532 Comm: khungtaskd Not tainted 4.14.258-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x180 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x5b9/0xb40 kernel/hung_task.c:274 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 22 Comm: kworker/u4:1 Not tainted 4.14.258-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker task: ffff8880b56005c0 task.stack: ffff8880b5608000 RIP: 0010:__read_once_size include/linux/compiler.h:185 [inline] RIP: 0010:trace_lock_release include/trace/events/lock.h:58 [inline] RIP: 0010:lock_release+0x59a/0x870 kernel/locking/lockdep.c:4016 RSP: 0018:ffff8880b560fc48 EFLAGS: 00000083 RAX: 0000000000000000 RBX: 1ffff11016ac1f8c RCX: 1ffffffff1198dac RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8880b5600e44 RBP: ffffffff88f77980 R08: 0000000000000000 R09: 0000000000020012 R10: 0000000000000000 R11: ffff8880b56005c0 R12: ffffffff86eb2d60 R13: ffff8880b56005c0 R14: ffff88813fe468c0 R15: ffff8880a4e0e800 FS: 0000000000000000(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fcf1a04c000 CR3: 00000000a24c9000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: rcu_lock_release include/linux/rcupdate.h:247 [inline] rcu_read_unlock include/linux/rcupdate.h:685 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:422 [inline] batadv_nc_worker+0x5a7/0xc50 net/batman-adv/network-coding.c:728 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Code: 03 0f b6 14 11 38 d0 7c 08 84 d2 0f 85 a1 02 00 00 8b 05 ca 2b b9 0a 85 c0 0f 85 19 fe ff ff e9 44 4c c0 05 65 ff 05 c6 b0 c0 7e <48> 8b 05 d7 8b b1 08 e8 2a 4e 04 00 85 c0 74 0d 80 3d 98 3b b1 ---------------- Code disassembly (best guess): 0: 03 0f add (%rdi),%ecx 2: b6 14 mov $0x14,%dh 4: 11 38 adc %edi,(%rax) 6: d0 7c 08 84 sarb -0x7c(%rax,%rcx,1) a: d2 0f rorb %cl,(%rdi) c: 85 a1 02 00 00 8b test %esp,-0x74fffffe(%rcx) 12: 05 ca 2b b9 0a add $0xab92bca,%eax 17: 85 c0 test %eax,%eax 19: 0f 85 19 fe ff ff jne 0xfffffe38 1f: e9 44 4c c0 05 jmpq 0x5c04c68 24: 65 ff 05 c6 b0 c0 7e incl %gs:0x7ec0b0c6(%rip) # 0x7ec0b0f1 * 2b: 48 8b 05 d7 8b b1 08 mov 0x8b18bd7(%rip),%rax # 0x8b18c09 <-- trapping instruction 32: e8 2a 4e 04 00 callq 0x44e61 37: 85 c0 test %eax,%eax 39: 74 0d je 0x48 3b: 80 .byte 0x80 3c: 3d .byte 0x3d 3d: 98 cwtl 3e: 3b .byte 0x3b 3f: b1 .byte 0xb1