INFO: task syz-executor.3:12985 blocked for more than 143 seconds. Not tainted 5.7.0-rc5-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D24272 12985 7370 0x00000004 Call Trace: context_switch kernel/sched/core.c:3367 [inline] __schedule+0x937/0x1ff0 kernel/sched/core.c:4083 __sched_text_start+0x8/0x8 atomic_try_cmpxchg include/asm-generic/atomic-instrumented.h:694 [inline] queued_spin_lock include/asm-generic/qspinlock.h:78 [inline] do_raw_spin_lock+0x129/0x2e0 kernel/locking/spinlock_debug.c:113 rwlock_bug.part.0+0x90/0x90 include/linux/sched.h:1329 schedule+0xd0/0x2a0 kernel/sched/core.c:4158 rwsem_down_write_slowpath+0x706/0xf90 kernel/locking/rwsem.c:1235 rwsem_mark_wake+0x8d0/0x8d0 include/linux/compiler.h:199 lock_acquire+0x1f2/0x8f0 kernel/locking/lockdep.c:4934 register_netdevice_notifier+0x1e/0x270 net/core/dev.c:1729 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline] _raw_spin_unlock_irqrestore+0x9b/0xe0 kernel/locking/spinlock.c:191 sock_update_netprioidx include/net/netprio_cgroup.h:36 [inline] sk_alloc+0x57d/0x1100 net/core/sock.c:1680 __down_write kernel/locking/rwsem.c:1389 [inline] down_write+0x137/0x150 kernel/locking/rwsem.c:1532 __down_write kernel/locking/rwsem.c:1389 [inline] down_write+0x137/0x150 kernel/locking/rwsem.c:1532 __down_timeout+0x2d0/0x2d0 lockdep_init_map_waits+0x26a/0x890 kernel/locking/lockdep.c:4138 register_netdevice_notifier+0x1e/0x270 net/core/dev.c:1729 bcm_init+0x1a3/0x210 net/can/bcm.c:1451 canbcm_pernet_init+0x90/0x90 net/can/bcm.c:1677 can_create+0x27c/0x500 net/can/af_can.c:168 __sock_create+0x3cb/0x730 net/socket.c:1433 sock_create net/socket.c:1484 [inline] __sys_socket+0xef/0x200 net/socket.c:1526 move_addr_to_kernel+0x70/0x70 net/socket.c:195 __do_sys_clock_gettime kernel/time/posix-timers.c:1094 [inline] __se_sys_clock_gettime kernel/time/posix-timers.c:1082 [inline] __x64_sys_clock_gettime+0x165/0x240 kernel/time/posix-timers.c:1082 __ia32_sys_clock_settime+0x260/0x260 kernel/time/posix-timers.c:1410 trace_hardirqs_off_caller+0x55/0x230 kernel/trace/trace_preemptirq.c:73 __do_sys_socket net/socket.c:1535 [inline] __se_sys_socket net/socket.c:1533 [inline] __x64_sys_socket+0x6f/0xb0 net/socket.c:1533 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 INFO: lockdep is turned off. NMI backtrace for cpu 1 CPU: 1 PID: 1133 Comm: khungtaskd Not tainted 5.7.0-rc5-syzkaller #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+0x188/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 lapic_can_unplug_cpu.cold+0x3b/0x3b nmi_trigger_cpumask_backtrace+0x231/0x27e lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0xa8c/0x1010 kernel/hung_task.c:289 reset_hung_task_detector+0x30/0x30 kernel/hung_task.c:243 kthread+0x388/0x470 kernel/kthread.c:268 kthread_mod_delayed_work+0x1a0/0x1a0 kernel/kthread.c:1090 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 6771 Comm: kworker/u4:6 Not tainted 5.7.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: krdsd rds_connect_worker RIP: 0010:check_kcov_mode kernel/kcov.c:153 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x10/0x50 kernel/kcov.c:187 Code: 1f 02 00 48 8b 80 f0 13 00 00 c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 65 48 8b 04 25 00 1f 02 00 65 8b 15 c8 e8 8e 7e <81> e2 00 01 1f 00 48 8b 34 24 75 2b 8b 90 d8 13 00 00 83 fa 02 75 RSP: 0018:ffffc900017c78e8 EFLAGS: 00000093 RAX: ffff888091066240 RBX: 0000000000000000 RCX: ffffffff8178b457 RDX: 0000000080000402 RSI: ffffffff8178b477 RDI: 0000000000000005 RBP: ffffffff86194e8e R08: ffff888091066240 R09: ffffed1011ee6937 R10: ffff88808f7349b3 R11: ffffed1011ee6936 R12: 0000000000000000 R13: ffffffff81460969 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c000009c80 CR3: 000000009f67d000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: arch_static_branch arch/x86/include/asm/jump_label.h:25 [inline] static_key_false include/linux/jump_label.h:200 [inline] trace_irq_disable_rcuidle include/trace/events/preemptirq.h:36 [inline] trace_hardirqs_off+0x76/0x220 kernel/trace/trace_preemptirq.c:42 sock_i_uid+0x8e/0xb0 net/core/sock.c:2092 __local_bh_enable_ip+0x119/0x270 kernel/softirq.c:171 sock_i_uid+0x8e/0xb0 net/core/sock.c:2092 inet_csk_bind_conflict+0x86/0x590 net/ipv4/inet_connection_sock.c:140 inet_csk_find_open_port net/ipv4/inet_connection_sock.c:233 [inline] inet_csk_get_port+0xd41/0x2520 net/ipv4/inet_connection_sock.c:317 inet_csk_listen_stop+0xb20/0xb20 net/ipv4/inet_connection_sock.c:1046 lock_downgrade+0x840/0x840 kernel/locking/lockdep.c:4579 __inet6_bind+0x5d5/0x19c0 net/ipv6/af_inet6.c:404 inet6_bind+0xf3/0x15c net/ipv6/af_inet6.c:454 rds_tcp_conn_path_connect+0x39a/0x880 net/rds/tcp_connect.c:144 rds_tcp_state_change+0x270/0x270 net/rds/tcp_connect.c:70 lock_release+0x800/0x800 kernel/locking/lockdep.c:4689 rds_connect_worker+0x1a5/0x2c0 net/rds/threads.c:176 process_one_work+0x965/0x16a0 kernel/workqueue.c:2268 lock_release+0x800/0x800 kernel/locking/lockdep.c:4689 pwq_dec_nr_in_flight+0x310/0x310 kernel/workqueue.c:1198 rwlock_bug.part.0+0x90/0x90 include/linux/sched.h:1329 worker_thread+0x96/0xe20 kernel/workqueue.c:2414 process_one_work+0x16a0/0x16a0 kernel/workqueue.c:2273 kthread+0x388/0x470 kernel/kthread.c:268 kthread_mod_delayed_work+0x1a0/0x1a0 kernel/kthread.c:1090 kthread_mod_delayed_work+0x1a0/0x1a0 kernel/kthread.c:1090 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351