Bluetooth: hci4 command 0x0419 tx timeout Bluetooth: hci4 command 0x0409 tx timeout Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci4 command 0x0419 tx timeout INFO: task kworker/u4:6:9378 blocked for more than 140 seconds. Not tainted 4.14.231-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:6 D28888 9378 2 0x80000000 Workqueue: netns cleanup_net 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 flush_workqueue+0x3ce/0x1310 kernel/workqueue.c:2676 flush_scheduled_work include/linux/workqueue.h:578 [inline] tipc_exit_net+0x38/0x60 net/tipc/core.c:96 ops_exit_list+0xa5/0x150 net/core/net_namespace.c:142 cleanup_net+0x3b3/0x840 net/core/net_namespace.c:484 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 Showing all locks held in the system: 3 locks held by kworker/1:0/18: #0: ("events"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2087 #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 1 lock held by khungtaskd/1533: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 3 locks held by kworker/0:4/9107: #0: ("events"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2087 #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/u4:6/9378: #0: ("%s""netns"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2087 #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.1/11720: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:410 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1533 Comm: khungtaskd Not tainted 4.14.231-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: 4617 Comm: systemd-journal Not tainted 4.14.231-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880a1a4c680 task.stack: ffff8880a1a50000 RIP: 0010:pvclock_clocksource_read+0x2b1/0x4f0 arch/x86/kernel/pvclock.c:122 RSP: 0018:ffff8880a1a57df8 EFLAGS: 00000292 RAX: 00000065a7a45772 RBX: ffffffff88f08c20 RCX: 0000000000000001 RDX: 0000000000000008 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 1ffffffff11e1258 R08: ffff88823fff7018 R09: ffff88823fff700f R10: ffff88823fff7017 R11: 00000065a7a45772 R12: dffffc0000000000 R13: 1ffffffff11e125a R14: ffffffff88f83f70 R15: ffff88823fff7010 FS: 00007f89b2b978c0(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f89affde000 CR3: 00000000a36c5000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kvm_clock_read+0x1f/0x30 arch/x86/kernel/kvmclock.c:88 tk_clock_read kernel/time/timekeeping.c:144 [inline] timekeeping_get_delta kernel/time/timekeeping.c:238 [inline] timekeeping_get_ns kernel/time/timekeeping.c:344 [inline] ktime_get_with_offset+0x1af/0x320 kernel/time/timekeeping.c:805 ktime_get_boottime include/linux/timekeeping.h:196 [inline] get_monotonic_boottime64 include/linux/timekeeping.h:254 [inline] posix_get_boottime+0x19/0x60 kernel/time/posix-timers.c:257 SYSC_clock_gettime kernel/time/posix-timers.c:1073 [inline] SyS_clock_gettime+0xe3/0x180 kernel/time/posix-timers.c:1063 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7ffd1014fb7e RSP: 002b:00007ffd1007b7d0 EFLAGS: 00000202 ORIG_RAX: 00000000000000e4 RAX: ffffffffffffffda RBX: 0000000000000007 RCX: 00007ffd1014fb7e RDX: ffffffffffffffff RSI: 00007ffd1007b820 RDI: 0000000000000007 RBP: 00007ffd1007b7f0 R08: 00007ffd1014d000 R09: 0000007427ec5fb7 R10: 000c1e54bb6373a5 R11: 0000000000000202 R12: 00007ffd1014c080 R13: 0000000000000001 R14: 0000000000000001 R15: 0005c021c8910572 Code: 75 1a 48 8b 05 41 cc 0a 0a 4c 39 d8 77 78 f0 4c 0f b1 1d 33 cc 0a 0a 4c 39 d8 75 ed 48 83 c4 58 4c 89 d8 5b 5d 41 5c 41 5d 41 5e <41> 5f c3 48 ba 00 00 00 00 00 fc ff df 4c 89 f6 48 c1 ee 03 0f