INFO: task syz-executor.5:6428 blocked for more than 140 seconds. Not tainted 4.14.218-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D29776 6428 8013 0x00000004 Call Trace: context_switch syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3384 schedule+0x8d/0x1b0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3486 __mutex_lock_common syzkaller/managers/linux-4-14/kernel/kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 syzkaller/managers/linux-4-14/kernel/kernel/locking/mutex.c:893 device_lock syzkaller/managers/linux-4-14/kernel/./include/linux/device.h:1081 [inline] usbdev_open+0x142/0x780 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/devio.c:1023 chrdev_open+0x23c/0x6d0 syzkaller/managers/linux-4-14/kernel/fs/char_dev.c:423 do_dentry_open+0x44b/0xec0 syzkaller/managers/linux-4-14/kernel/fs/open.c:777 vfs_open+0x105/0x220 syzkaller/managers/linux-4-14/kernel/fs/open.c:888 do_last syzkaller/managers/linux-4-14/kernel/fs/namei.c:3428 [inline] path_openat+0x628/0x2970 syzkaller/managers/linux-4-14/kernel/fs/namei.c:3569 do_filp_open+0x179/0x3c0 syzkaller/managers/linux-4-14/kernel/fs/namei.c:3603 do_sys_open+0x296/0x410 syzkaller/managers/linux-4-14/kernel/fs/open.c:1081 do_syscall_64+0x1d5/0x640 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x4190f4 RSP: 002b:00007fc1f724fcc0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 00000000004190f4 RDX: 0000000000000001 RSI: 00007fc1f724fd60 RDI: 00000000ffffff9c RBP: 00007fc1f724fd60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001 R13: 00007ffef575df9f R14: 00007fc1f7250300 R15: 0000000000022000 INFO: task syz-executor.4:6429 blocked for more than 140 seconds. Not tainted 4.14.218-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D29776 6429 8017 0x00000004 Call Trace: context_switch syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3384 schedule+0x8d/0x1b0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3486 __mutex_lock_common syzkaller/managers/linux-4-14/kernel/kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 syzkaller/managers/linux-4-14/kernel/kernel/locking/mutex.c:893 device_lock syzkaller/managers/linux-4-14/kernel/./include/linux/device.h:1081 [inline] usbdev_open+0x142/0x780 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/devio.c:1023 chrdev_open+0x23c/0x6d0 syzkaller/managers/linux-4-14/kernel/fs/char_dev.c:423 do_dentry_open+0x44b/0xec0 syzkaller/managers/linux-4-14/kernel/fs/open.c:777 vfs_open+0x105/0x220 syzkaller/managers/linux-4-14/kernel/fs/open.c:888 do_last syzkaller/managers/linux-4-14/kernel/fs/namei.c:3428 [inline] path_openat+0x628/0x2970 syzkaller/managers/linux-4-14/kernel/fs/namei.c:3569 do_filp_open+0x179/0x3c0 syzkaller/managers/linux-4-14/kernel/fs/namei.c:3603 do_sys_open+0x296/0x410 syzkaller/managers/linux-4-14/kernel/fs/open.c:1081 do_syscall_64+0x1d5/0x640 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x4190f4 RSP: 002b:00007fed0efd0cc0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 00000000004190f4 RDX: 0000000000000001 RSI: 00007fed0efd0d60 RDI: 00000000ffffff9c RBP: 00007fed0efd0d60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001 R13: 00007fff5c6aa15f R14: 00007fed0efd1300 R15: 0000000000022000 INFO: task syz-executor.0:6432 blocked for more than 140 seconds. Not tainted 4.14.218-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D29776 6432 8015 0x00000004 Call Trace: context_switch syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3384 schedule+0x8d/0x1b0 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3428 schedule_preempt_disabled+0xf/0x20 syzkaller/managers/linux-4-14/kernel/kernel/sched/core.c:3486 __mutex_lock_common syzkaller/managers/linux-4-14/kernel/kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 syzkaller/managers/linux-4-14/kernel/kernel/locking/mutex.c:893 device_lock syzkaller/managers/linux-4-14/kernel/./include/linux/device.h:1081 [inline] usbdev_open+0x142/0x780 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/devio.c:1023 chrdev_open+0x23c/0x6d0 syzkaller/managers/linux-4-14/kernel/fs/char_dev.c:423 do_dentry_open+0x44b/0xec0 syzkaller/managers/linux-4-14/kernel/fs/open.c:777 vfs_open+0x105/0x220 syzkaller/managers/linux-4-14/kernel/fs/open.c:888 do_last syzkaller/managers/linux-4-14/kernel/fs/namei.c:3428 [inline] path_openat+0x628/0x2970 syzkaller/managers/linux-4-14/kernel/fs/namei.c:3569 do_filp_open+0x179/0x3c0 syzkaller/managers/linux-4-14/kernel/fs/namei.c:3603 do_sys_open+0x296/0x410 syzkaller/managers/linux-4-14/kernel/fs/open.c:1081 do_syscall_64+0x1d5/0x640 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x4190f4 RSP: 002b:00007f910ddeccc0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 00000000004190f4 RDX: 0000000000000001 RSI: 00007f910ddecd60 RDI: 00000000ffffff9c RBP: 00007f910ddecd60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001 R13: 00007ffd7d24121f R14: 00007f910dded300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1520: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a syzkaller/managers/linux-4-14/kernel/kernel/locking/lockdep.c:4548 1 lock held by in:imklog/7706: #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 syzkaller/managers/linux-4-14/kernel/fs/file.c:769 5 locks held by kworker/0:5/20907: #0: ("usb_hub_wq"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2087 #1: ((&hub->events)){+.+.}, at: [] process_one_work+0x6e6/0x14a0 syzkaller/managers/linux-4-14/kernel/kernel/workqueue.c:2091 #2: (&dev->mutex){....}, at: [] device_lock syzkaller/managers/linux-4-14/kernel/./include/linux/device.h:1081 [inline] #2: (&dev->mutex){....}, at: [] hub_event+0x108/0x3d70 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5220 #3: (&port_dev->status_lock){+.+.}, at: [] usb_lock_port syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:2934 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] hub_port_connect syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:4904 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] hub_port_connect_change syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5088 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] port_event syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5194 [inline] #3: (&port_dev->status_lock){+.+.}, at: [] hub_event+0x18e8/0x3d70 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:5274 #4: (hcd->address0_mutex){+.+.}, at: [] hub_port_init+0x15b/0x2970 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/hub.c:4429 1 lock held by syz-executor.5/6428: #0: (&dev->mutex){....}, at: [] device_lock syzkaller/managers/linux-4-14/kernel/./include/linux/device.h:1081 [inline] #0: (&dev->mutex){....}, at: [] usbdev_open+0x142/0x780 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/devio.c:1023 1 lock held by syz-executor.4/6429: #0: (&dev->mutex){....}, at: [] device_lock syzkaller/managers/linux-4-14/kernel/./include/linux/device.h:1081 [inline] #0: (&dev->mutex){....}, at: [] usbdev_open+0x142/0x780 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/devio.c:1023 1 lock held by syz-executor.0/6432: #0: (&dev->mutex){....}, at: [] device_lock syzkaller/managers/linux-4-14/kernel/./include/linux/device.h:1081 [inline] #0: (&dev->mutex){....}, at: [] usbdev_open+0x142/0x780 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/devio.c:1023 1 lock held by syz-executor.2/6453: #0: (&dev->mutex){....}, at: [] device_lock syzkaller/managers/linux-4-14/kernel/./include/linux/device.h:1081 [inline] #0: (&dev->mutex){....}, at: [] usbdev_open+0x142/0x780 syzkaller/managers/linux-4-14/kernel/drivers/usb/core/devio.c:1023 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1520 Comm: khungtaskd Not tainted 4.14.218-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack syzkaller/managers/linux-4-14/kernel/lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 syzkaller/managers/linux-4-14/kernel/lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 syzkaller/managers/linux-4-14/kernel/lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x180 syzkaller/managers/linux-4-14/kernel/lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace syzkaller/managers/linux-4-14/kernel/./include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks syzkaller/managers/linux-4-14/kernel/kernel/hung_task.c:195 [inline] watchdog+0x5b9/0xb40 syzkaller/managers/linux-4-14/kernel/kernel/hung_task.c:274 kthread+0x30d/0x420 syzkaller/managers/linux-4-14/kernel/kernel/kthread.c:232 ret_from_fork+0x24/0x30 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/entry_64.S:404 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4621 Comm: systemd-journal Not tainted 4.14.218-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880a17c6080 task.stack: ffff8880a17c8000 RIP: 0010:__orc_find+0x3f/0xf0 syzkaller/managers/linux-4-14/kernel/arch/x86/kernel/unwind_orc.c:50 RSP: 0018:ffff8880a17cfa18 EFLAGS: 00000202 RAX: ffffffff81004c83 RBX: ffffffff8a113764 RCX: ffffffff81004e44 RDX: 0000000000000000 RSI: ffffffff8a6669de RDI: ffffffff8a113764 RBP: ffffffff8a113768 R08: ffffffff8a6669de R09: ffffffff8a6669e4 R10: 000000000000011d R11: 0000000000066071 R12: ffffffff8a113764 R13: ffffffff8a113764 R14: ffffffff8a113764 R15: dffffc0000000000 FS: 00007f011156d8c0(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f010ebaa000 CR3: 00000000a19c4000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: orc_find syzkaller/managers/linux-4-14/kernel/arch/x86/kernel/unwind_orc.c:118 [inline] unwind_next_frame+0x59a/0x17d0 syzkaller/managers/linux-4-14/kernel/arch/x86/kernel/unwind_orc.c:348 __save_stack_trace+0x90/0x160 syzkaller/managers/linux-4-14/kernel/arch/x86/kernel/stacktrace.c:44 save_stack syzkaller/managers/linux-4-14/kernel/mm/kasan/kasan.c:447 [inline] set_track syzkaller/managers/linux-4-14/kernel/mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 syzkaller/managers/linux-4-14/kernel/mm/kasan/kasan.c:551 slab_post_alloc_hook syzkaller/managers/linux-4-14/kernel/mm/slab.h:442 [inline] slab_alloc syzkaller/managers/linux-4-14/kernel/mm/slab.c:3390 [inline] kmem_cache_alloc+0x111/0x3c0 syzkaller/managers/linux-4-14/kernel/mm/slab.c:3550 getname_flags+0xc8/0x550 syzkaller/managers/linux-4-14/kernel/fs/namei.c:138 getname syzkaller/managers/linux-4-14/kernel/fs/namei.c:209 [inline] user_path_create syzkaller/managers/linux-4-14/kernel/fs/namei.c:3732 [inline] SYSC_mkdirat syzkaller/managers/linux-4-14/kernel/fs/namei.c:3864 [inline] SyS_mkdirat+0x83/0x270 syzkaller/managers/linux-4-14/kernel/fs/namei.c:3856 do_syscall_64+0x1d5/0x640 syzkaller/managers/linux-4-14/kernel/arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f0110829687 RSP: 002b:00007ffcaa294d48 EFLAGS: 00000293 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007ffcaa297db0 RCX: 00007f0110829687 RDX: 0000000000000000 RSI: 00000000000001ed RDI: 00005621ca1588a0 RBP: 00007ffcaa294d80 R08: 00005621c8cc93e5 R09: 0000000000000018 R10: 0000000000000069 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000001 R14: 00005621ca1588a0 R15: 00007ffcaa2953c0 Code: 10 85 d2 0f 84 95 00 00 00 4c 39 e7 49 89 fd 0f 87 9a 00 00 00 49 bf 00 00 00 00 00 fc ff df 49 89 fe 48 89 fd eb 0c 48 8d 6b 04 <49> 89 de 49 39 ec 72 4d 4c 89 e0 48 29 e8 48 89 c2 48 c1 e8 3f