usb usb4: usbfs: process 24365 (syz-executor.2) did not claim interface 0 before use usb usb4: usbfs: process 24365 (syz-executor.2) did not claim interface 0 before use usb usb4: usbfs: process 24362 (syz-executor.3) did not claim interface 0 before use INFO: task syz-executor.4:24337 blocked for more than 140 seconds. Not tainted 4.14.208-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28880 24337 7993 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_timeout+0x80a/0xe90 kernel/time/timer.c:1724 do_wait_for_common kernel/sched/completion.c:91 [inline] __wait_for_common kernel/sched/completion.c:112 [inline] wait_for_common+0x272/0x430 kernel/sched/completion.c:123 usb_start_wait_urb+0x125/0x440 drivers/usb/core/message.c:61 usb_bulk_msg+0x1f6/0x500 drivers/usb/core/message.c:252 proc_bulk+0x331/0x6d0 drivers/usb/core/devio.c:1223 usbdev_do_ioctl+0x5b0/0x2b70 drivers/usb/core/devio.c:2449 usbdev_ioctl+0x21/0x30 drivers/usb/core/devio.c:2599 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45deb9 RSP: 002b:00007f6078aacc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000001af00 RCX: 000000000045deb9 RDX: 0000000020000040 RSI: 00000000c0185502 RDI: 0000000000000003 RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007ffe97b51ccf R14: 00007f6078aad9c0 R15: 000000000118bf2c 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/7682: #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0x1fb/0x2b0 fs/file.c:769 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1532 Comm: khungtaskd Not tainted 4.14.208-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+0x1b2/0x283 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x17f 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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 7683 Comm: rs:main Q:Reg Not tainted 4.14.208-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880922a04c0 task.stack: ffff88808fac8000 RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline] RIP: 0010:task_rlimit include/linux/sched/signal.h:612 [inline] RIP: 0010:rlimit include/linux/sched/signal.h:623 [inline] RIP: 0010:generic_write_checks+0x6a/0x410 mm/filemap.c:2845 RSP: 0018:ffff88808facfbb8 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: ffff88808facfd68 RCX: a383cf8086c54f09 RDX: 1ffff1101652cd78 RSI: ffff88808facfdb8 RDI: ffff8880b2966bc0 RBP: ffff88808facfdb8 R08: 0000000000000001 R09: 0000000000048409 R10: ffff8880922a0d98 R11: ffff8880922a04c0 R12: ffff8880b2966880 R13: ffff8880902ca330 R14: ffff8880902ca410 R15: 0000000000000000 FS: 00007eff47b5a700(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f28aefd4000 CR3: 0000000093a5c000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ext4_write_checks+0x5f/0x2a0 fs/ext4/file.c:164 ext4_file_write_iter+0x21f/0xd20 fs/ext4/file.c:242 call_write_iter include/linux/fs.h:1778 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x44c/0x630 fs/read_write.c:482 vfs_write+0x17f/0x4d0 fs/read_write.c:544 SYSC_write fs/read_write.c:590 [inline] SyS_write+0xf2/0x210 fs/read_write.c:582 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7eff4a59e1cd RSP: 002b:00007eff47b59590 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007eff3c0095c0 RCX: 00007eff4a59e1cd RDX: 000000000000040d RSI: 00007eff3c0095c0 RDI: 0000000000000006 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007eff3c009340 R13: 00007eff47b595b0 R14: 00005570243ca360 R15: 000000000000040d Code: 0f 85 5d 03 00 00 4d 8b a4 24 00 07 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d bc 24 40 03 00 00 48 89 fa 48 c1 ea 03 80 3c 02 00 <0f> 85 28 03 00 00 48 8d 7d 10 4d 8b a4 24 40 03 00 00 48 b8 00