hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 INFO: task kworker/u4:0:10344 blocked for more than 140 seconds. Not tainted 4.14.229-syzkaller #0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 kworker/u4:0 D hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 27040 10344 2 0x80000000 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 Workqueue: netns cleanup_net hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 Call Trace: hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 context_switch kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3384 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 schedule_timeout+0x80a/0xe90 kernel/time/timer.c:1724 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 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 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 flush_workqueue+0x3ce/0x1310 kernel/workqueue.c:2676 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 flush_scheduled_work include/linux/workqueue.h:578 [inline] tipc_exit_net+0x38/0x60 net/tipc/core.c:96 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 ops_exit_list+0xa5/0x150 net/core/net_namespace.c:142 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 cleanup_net+0x3b3/0x840 net/core/net_namespace.c:484 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 kthread+0x30d/0x420 kernel/kthread.c:232 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 Showing all locks held in the system: hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 1 lock held by khungtaskd/1533: hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 2 locks held by agetty/7693: hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&ldata->atomic_read_lock){+.+.} hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 , at: [] n_tty_read+0x1e3/0x1680 drivers/tty/n_tty.c:2156 3 locks held by kworker/0:0/12203: hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 #0: ("events"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2087 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 #1: ((&smc->tcp_listen_work)){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2091 #2: (&smc->clcsock_release_lock){+.+.}, at: [] smc_clcsock_accept net/smc/af_smc.c:600 [inline] #2: (&smc->clcsock_release_lock){+.+.}, at: [] smc_tcp_listen_work+0x6ac/0xb80 net/smc/af_smc.c:935 3 locks held by kworker/u4:0/10344: hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 #0: ("%s""netns"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2087 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 #1: (net_cleanup_work){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2091 #2: (net_mutex){+.+.}, at: [] cleanup_net+0x110/0x840 net/core/net_namespace.c:450 1 lock held by syz-executor.4/12774: hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:410 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 ============================================= NMI backtrace for cpu 1 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 CPU: 1 PID: 1533 Comm: khungtaskd Not tainted 4.14.229-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 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 hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 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: hid-generic 0000:0000:0000.015F: unknown main item tag 0x0 NMI backtrace for cpu 0 CPU: 0 PID: 10282 Comm: kworker/0:1 Not tainted 4.14.229-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events uhid_device_add_worker task: ffff8880a21ea480 task.stack: ffff8880375b0000 RIP: 0010:io_serial_out+0x68/0x80 drivers/tty/serial/8250/8250_port.c:457 RSP: 0018:ffff8880375b73f8 EFLAGS: 00000002 RAX: 000000000000005b RBX: 00000000000003f8 RCX: 0000000000000000 RDX: 00000000000003f8 RSI: 0000000000000000 RDI: ffffffff8c8c24f8 RBP: ffffffff8c8c24c0 R08: ffffffff8b9b0838 R09: 00000000000c0043 R10: ffff8880a21eadd0 R11: ffff8880a21ea480 R12: 000000000000005b R13: ffffffff8c8c24c0 R14: dffffc0000000000 R15: ffffffff8be7a8d6 FS: 0000000000000000(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f259b1e0000 CR3: 0000000050f99000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: uart_console_write+0x44/0xd0 drivers/tty/serial/serial_core.c:1903 serial8250_console_write+0x582/0x9d0 drivers/tty/serial/8250/8250_port.c:3271 call_console_drivers kernel/printk/printk.c:1725 [inline] console_unlock+0x99d/0xf20 kernel/printk/printk.c:2400 vprintk_emit+0x224/0x620 kernel/printk/printk.c:1923 dev_vprintk_emit+0x1da/0x440 drivers/base/core.c:3004 dev_printk_emit+0xa5/0xd0 drivers/base/core.c:3015 __dev_printk+0xfe/0x250 drivers/base/core.c:3027 dev_err+0xc5/0xf0 drivers/base/core.c:3070 hid_parser_main+0x585/0x9e0 drivers/hid/hid-core.c:609 hid_open_report+0x335/0x630 drivers/hid/hid-core.c:1093 hid_device_probe+0x215/0x2a0 drivers/hid/hid-core.c:2593 really_probe drivers/base/dd.c:409 [inline] driver_probe_device+0x753/0xc80 drivers/base/dd.c:552 __device_attach_driver+0x277/0x360 drivers/base/dd.c:648 bus_for_each_drv+0x13b/0x1a0 drivers/base/bus.c:466 __device_attach+0x259/0x390 drivers/base/dd.c:705 bus_probe_device+0x1db/0x290 drivers/base/bus.c:526 device_add+0xa4f/0x15c0 drivers/base/core.c:1932 hid_add_device+0x302/0x880 drivers/hid/hid-core.c:3066 uhid_device_add_worker+0x3a/0x140 drivers/hid/uhid.c:66 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Code: 8d d1 00 00 00 48 8d 7d 38 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 d3 e3 80 3c 02 00 75 15 03 5d 38 44 89 e0 89 da ee <5b> 5d 41 5c c3 e8 ae 37 24 fe eb c7 e8 77 39 24 fe eb e4 0f 1f