INFO: task kworker/0:1:21836 blocked for more than 143 seconds. Not tainted 5.3.0-rc7 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/0:1 D27704 21836 2 0x80004000 Workqueue: events linkwatch_event Call Trace: context_switch kernel/sched/core.c:3254 [inline] __schedule+0x877/0xc50 kernel/sched/core.c:3880 schedule+0x131/0x1e0 kernel/sched/core.c:3947 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4006 __mutex_lock_common+0x1401/0x2820 kernel/locking/mutex.c:1007 __mutex_lock kernel/locking/mutex.c:1077 [inline] mutex_lock_nested+0x1b/0x30 kernel/locking/mutex.c:1092 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72 linkwatch_event+0xe/0x60 net/core/link_watch.c:242 process_one_work+0x7ef/0x10e0 kernel/workqueue.c:2269 worker_thread+0xc01/0x1630 kernel/workqueue.c:2415 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 INFO: task kworker/0:0:13253 blocked for more than 143 seconds. Not tainted 5.3.0-rc7 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/0:0 D28072 13253 2 0x80004000 Workqueue: events switchdev_deferred_process_work Call Trace: context_switch kernel/sched/core.c:3254 [inline] __schedule+0x877/0xc50 kernel/sched/core.c:3880 schedule+0x131/0x1e0 kernel/sched/core.c:3947 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4006 __mutex_lock_common+0x1401/0x2820 kernel/locking/mutex.c:1007 __mutex_lock kernel/locking/mutex.c:1077 [inline] mutex_lock_nested+0x1b/0x30 kernel/locking/mutex.c:1092 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72 switchdev_deferred_process_work+0xe/0x20 net/switchdev/switchdev.c:74 process_one_work+0x7ef/0x10e0 kernel/workqueue.c:2269 worker_thread+0xc01/0x1630 kernel/workqueue.c:2415 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 INFO: task syz-executor.5:13899 blocked for more than 143 seconds. Not tainted 5.3.0-rc7 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28776 13899 1 0x00004004 Call Trace: context_switch kernel/sched/core.c:3254 [inline] __schedule+0x877/0xc50 kernel/sched/core.c:3880 schedule+0x131/0x1e0 kernel/sched/core.c:3947 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4006 __mutex_lock_common+0x1401/0x2820 kernel/locking/mutex.c:1007 __mutex_lock kernel/locking/mutex.c:1077 [inline] mutex_lock_nested+0x1b/0x30 kernel/locking/mutex.c:1092 rtnl_lock net/core/rtnetlink.c:72 [inline] rtnetlink_rcv_msg+0x83c/0xd40 net/core/rtnetlink.c:5220 netlink_rcv_skb+0x19e/0x3d0 net/netlink/af_netlink.c:2477 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5241 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] netlink_unicast+0x787/0x900 net/netlink/af_netlink.c:1328 netlink_sendmsg+0x993/0xc50 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg net/socket.c:657 [inline] __sys_sendto+0x442/0x5e0 net/socket.c:1952 __do_sys_sendto net/socket.c:1964 [inline] __se_sys_sendto net/socket.c:1960 [inline] __x64_sys_sendto+0xe5/0x100 net/socket.c:1960 do_syscall_64+0xfe/0x140 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4136c3 Code: e0 1f 41 00 ba 01 00 00 00 be 01 00 00 00 bf 3f 29 44 00 ff 15 c6 9f 24 00 e9 83 fc ff ff be 01 00 00 00 48 8d 7c 24 0c ff 54 <24> 18 85 c0 0f 85 6d fc ff ff 83 7c 24 0c 00 0f 84 e7 fc ff ff c7 RSP: 002b:00007fffd4214f68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004136c3 RDX: 0000000000000028 RSI: 0000000000a70070 RDI: 0000000000000003 RBP: 00007fffd4214fd0 R08: 00007fffd4214f70 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003 R13: 00007fffd42152d8 R14: 0000000000000000 R15: 0000000000000000 INFO: lockdep is turned off. NMI backtrace for cpu 1 CPU: 1 PID: 1058 Comm: khungtaskd Not tainted 5.3.0-rc7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d8/0x2f8 lib/dump_stack.c:113 nmi_cpu_backtrace+0xaf/0x1a0 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x174/0x290 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace+0x17/0x20 include/linux/nmi.h:146 check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0xbb9/0xbd0 kernel/hung_task.c:289 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 3908 Comm: udevd Not tainted 5.3.0-rc7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:do_syscall_64+0x18/0x140 arch/x86/entry/common.c:283 Code: ff ff e8 9b 14 73 00 0f 0b 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 57 41 56 41 55 41 54 53 49 89 f6 49 89 ff e8 78 14 73 00 73 95 78 00 48 c7 c0 90 87 8a 88 48 c1 e8 03 49 bc 00 00 00 00 RSP: 0018:ffff888096277f20 EFLAGS: 00000093 RAX: ffffffff81007868 RBX: 0000000000000000 RCX: ffff8880962685c0 RDX: 0000000000000000 RSI: ffff888096277f58 RDI: 00000000000000e8 RBP: ffff888096277f48 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffff888096277f58 R15: 00000000000000e8 FS: 00007fe4d71aa7a0(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000000961e4000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fe4d68be943 Code: 00 31 d2 48 29 c2 64 89 11 48 83 c8 ff eb ea 90 90 90 90 90 90 90 90 83 3d b5 dc 2a 00 00 75 13 49 89 ca b8 e8 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 34 c3 48 83 ec 08 e8 3b c4 00 00 48 89 04 24 RSP: 002b:00007fff89c71958 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8 RAX: ffffffffffffffda RBX: 0000000000000bb8 RCX: 00007fe4d68be943 RDX: 0000000000000008 RSI: 00007fff89c71a50 RDI: 000000000000000a RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000bb8 R11: 0000000000000246 R12: 0000000000000003 R13: 0000000000000000 R14: 0000000001174210 R15: 0000000001174250