INFO: task syz-executor057:8093 blocked for more than 140 seconds. Not tainted 4.19.172-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor057 D26880 8093 8092 0x00000004 Call Trace: context_switch syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:3517 schedule+0x8d/0x1b0 syzkaller/managers/linux-4-19/kernel/kernel/sched/core.c:3561 schedule_timeout+0x92d/0xfe0 syzkaller/managers/linux-4-19/kernel/kernel/time/timer.c:1794 do_wait_for_common syzkaller/managers/linux-4-19/kernel/kernel/sched/completion.c:83 [inline] __wait_for_common syzkaller/managers/linux-4-19/kernel/kernel/sched/completion.c:104 [inline] wait_for_common+0x29c/0x470 syzkaller/managers/linux-4-19/kernel/kernel/sched/completion.c:115 usb_start_wait_urb+0x14b/0x4c0 syzkaller/managers/linux-4-19/kernel/drivers/usb/core/message.c:62 usb_bulk_msg+0x226/0x550 syzkaller/managers/linux-4-19/kernel/drivers/usb/core/message.c:253 proc_bulk+0x3de/0x860 syzkaller/managers/linux-4-19/kernel/drivers/usb/core/devio.c:1206 usbdev_do_ioctl+0x696/0x3030 syzkaller/managers/linux-4-19/kernel/drivers/usb/core/devio.c:2430 usbdev_ioctl+0x21/0x30 syzkaller/managers/linux-4-19/kernel/drivers/usb/core/devio.c:2580 vfs_ioctl syzkaller/managers/linux-4-19/kernel/fs/ioctl.c:46 [inline] file_ioctl syzkaller/managers/linux-4-19/kernel/fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/0x12e0 syzkaller/managers/linux-4-19/kernel/fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 syzkaller/managers/linux-4-19/kernel/fs/ioctl.c:705 __do_sys_ioctl syzkaller/managers/linux-4-19/kernel/fs/ioctl.c:712 [inline] __se_sys_ioctl syzkaller/managers/linux-4-19/kernel/fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 syzkaller/managers/linux-4-19/kernel/fs/ioctl.c:710 do_syscall_64+0xf9/0x620 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x444209 Code: Bad RIP value. RSP: 002b:00007fff0bb91248 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004004a0 RCX: 0000000000444209 RDX: 00000000200002c0 RSI: 00000000c0185502 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007fff0bb913e8 R09: 00007fff0bb913e8 R10: 00007fff0bb90cc0 R11: 0000000000000246 R12: 0000000000403520 R13: 431bde82d7b634db R14: 00000000004b2018 R15: 00000000004004a0 Showing all locks held in the system: 1 lock held by khungtaskd/1566: #0: 00000000ddfb48e3 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 syzkaller/managers/linux-4-19/kernel/kernel/locking/lockdep.c:4440 1 lock held by in:imklog/7742: #0: 00000000c2f8398a (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 syzkaller/managers/linux-4-19/kernel/fs/file.c:767 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1566 Comm: khungtaskd Not tainted 4.19.172-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack syzkaller/managers/linux-4-19/kernel/lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef syzkaller/managers/linux-4-19/kernel/lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 syzkaller/managers/linux-4-19/kernel/lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 syzkaller/managers/linux-4-19/kernel/lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace syzkaller/managers/linux-4-19/kernel/./include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks syzkaller/managers/linux-4-19/kernel/kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 syzkaller/managers/linux-4-19/kernel/kernel/hung_task.c:287 kthread+0x33f/0x460 syzkaller/managers/linux-4-19/kernel/kernel/kthread.c:259 ret_from_fork+0x24/0x30 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/entry_64.S:415 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4691 Comm: systemd-journal Not tainted 4.19.172-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:get_current syzkaller/managers/linux-4-19/kernel/./arch/x86/include/asm/current.h:15 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x4/0x50 syzkaller/managers/linux-4-19/kernel/kernel/kcov.c:100 Code: e8 a1 b7 35 00 e9 ab fe ff ff 4c 89 ef e8 94 b7 35 00 e9 23 fe ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 8b 34 24 <65> 48 8b 04 25 80 df 01 00 65 8b 15 3c 85 9f 7e 81 e2 00 01 1f 00 RSP: 0018:ffff8880a0e1fb68 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 1ffff110141c3f98 RCX: ffffffff81a1b402 RDX: 0000000000000041 RSI: ffffffff81a6165a RDI: ffff8880a0e1fce0 RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880a0e14540 R13: ffff8880a0e1fce0 R14: 0000000000000001 R15: ffff8880a0e1fe90 FS: 00007f87ace008c0(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f87aa1d2000 CR3: 00000000a0c2b000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: path_openat+0x8a/0x2df0 syzkaller/managers/linux-4-19/kernel/fs/namei.c:3526 do_filp_open+0x18c/0x3f0 syzkaller/managers/linux-4-19/kernel/fs/namei.c:3567 do_sys_open+0x3b3/0x520 syzkaller/managers/linux-4-19/kernel/fs/open.c:1085 do_syscall_64+0xf9/0x620 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f87ac390840 Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 RSP: 002b:00007ffe20bf28b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007ffe20bf2bc0 RCX: 00007f87ac390840 RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 000055aeb81c0680 RBP: 000000000000000d R08: 000000000000ffc0 R09: 00000000ffffffff R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff R13: 000055aeb81b3040 R14: 00007ffe20bf2b80 R15: 000055aeb81b9b20