INFO: task syz-executor.1:12640 blocked for more than 143 seconds. Not tainted 5.3.0+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28768 12640 7903 0x00004004 Call Trace: context_switch kernel/sched/core.c:3384 [inline] __schedule+0x638/0x9c0 kernel/sched/core.c:4065 schedule+0x131/0x1e0 kernel/sched/core.c:4132 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4191 __mutex_lock_common+0x1411/0x2e20 kernel/locking/mutex.c:1033 __mutex_lock kernel/locking/mutex.c:1103 [inline] mutex_lock_nested+0x1b/0x30 kernel/locking/mutex.c:1118 genl_lock net/netlink/genetlink.c:33 [inline] genl_rcv_msg+0xcc/0x12b0 net/netlink/genetlink.c:652 netlink_rcv_skb+0x19e/0x3d0 net/netlink/af_netlink.c:2477 genl_rcv+0x28/0x40 net/netlink/genetlink.c:665 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] netlink_unicast+0x787/0x8f0 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_sendmsg+0x60d/0x910 net/socket.c:2311 __sys_sendmsg net/socket.c:2356 [inline] __do_sys_sendmsg net/socket.c:2365 [inline] __se_sys_sendmsg net/socket.c:2363 [inline] __x64_sys_sendmsg+0x17c/0x200 net/socket.c:2363 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x413831 Code: eb a5 0f 1f 80 00 00 00 00 bf 7d 30 44 00 b9 09 00 00 00 48 89 ee f3 a6 74 1f bf 86 30 44 00 b9 11 00 00 00 48 89 ee f3 a6 75 <28> 48 c7 03 10 39 41 00 e9 70 ff ff ff 66 90 48 c7 03 80 3c 41 00 RSP: 002b:00007fda4e3d69c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fda4e3d6a58 RCX: 0000000000413831 RDX: 0000000000000000 RSI: 00007fda4e3d6a00 RDI: 0000000000000005 RBP: 0000000000000005 R08: 000000000000000b R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007fda4e3d6a40 R13: 00000000004d0ae8 R14: 00000000004dfab0 R15: 00000000ffffffff INFO: task syz-executor.1:12649 blocked for more than 143 seconds. Not tainted 5.3.0+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28272 12649 7903 0x00004004 Call Trace: context_switch kernel/sched/core.c:3384 [inline] __schedule+0x638/0x9c0 kernel/sched/core.c:4065 schedule+0x131/0x1e0 kernel/sched/core.c:4132 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4191 __mutex_lock_common+0x1411/0x2e20 kernel/locking/mutex.c:1033 __mutex_lock kernel/locking/mutex.c:1103 [inline] mutex_lock_nested+0x1b/0x30 kernel/locking/mutex.c:1118 genl_lock net/netlink/genetlink.c:33 [inline] genl_rcv_msg+0xcc/0x12b0 net/netlink/genetlink.c:652 netlink_rcv_skb+0x19e/0x3d0 net/netlink/af_netlink.c:2477 genl_rcv+0x28/0x40 net/netlink/genetlink.c:665 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] netlink_unicast+0x787/0x8f0 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_sendmsg+0x60d/0x910 net/socket.c:2311 __sys_sendmsg net/socket.c:2356 [inline] __do_sys_sendmsg net/socket.c:2365 [inline] __se_sys_sendmsg net/socket.c:2363 [inline] __x64_sys_sendmsg+0x17c/0x200 net/socket.c:2363 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x413831 Code: 75 14 b8 2e 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 e4 19 00 00 c3 48 83 ec 08 e8 ea fa ff ff 48 89 04 24 b8 2e 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 33 fb ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007fda4e3b59c0 EFLAGS: 00000293 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fda4e3b5a58 RCX: 0000000000413831 RDX: 0000000000000000 RSI: 00007fda4e3b5a00 RDI: 0000000000000005 RBP: 0000000000000005 R08: 000000000000000b R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007fda4e3b5a40 R13: 00000000004d0ae8 R14: 00000000004dfab0 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/1064: #0: ffffffff888d3cc0 (rcu_read_lock){....}, at: rcu_lock_acquire+0x4/0x30 include/linux/rcupdate.h:207 1 lock held by rsyslogd/7775: #0: ffff888096c0c8e0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x243/0x2e0 fs/file.c:801 2 locks held by getty/7865: #0: ffff888096292090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: ffffc90005f292e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156 2 locks held by getty/7866: #0: ffff8880992409d0 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: ffffc90005f392e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156 2 locks held by getty/7867: #0: ffff88809628e1d0 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: ffffc90005f412e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156 2 locks held by getty/7868: #0: ffff888099240150 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: ffffc90005f3d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156 2 locks held by getty/7869: #0: ffff888096292910 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: ffffc90005f212e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156 2 locks held by getty/7870: #0: ffff8880a0fcaad0 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: ffffc90005f2d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156 2 locks held by getty/7871: #0: ffff88809b2557d0 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: ffffc90005f112e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156 3 locks held by syz-executor.2/12627: 2 locks held by syz-executor.1/12640: #0: ffffffff88b147a0 (cb_lock){++++}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:664 #1: ffffffff88b146c8 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff88b146c8 (genl_mutex){+.+.}, at: genl_rcv_msg+0xcc/0x12b0 net/netlink/genetlink.c:652 2 locks held by syz-executor.1/12649: #0: ffffffff88b147a0 (cb_lock){++++}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:664 #1: ffffffff88b146c8 (genl_mutex){+.+.}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff88b146c8 (genl_mutex){+.+.}, at: genl_rcv_msg+0xcc/0x12b0 net/netlink/genetlink.c:652 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1064 Comm: khungtaskd Not tainted 5.3.0+ #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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 3892 Comm: udevd Not tainted 5.3.0+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:enqueue_entity+0xed/0x1030 kernel/sched/fair.c:3983 Code: d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 12 48 89 df e8 50 30 5a 00 48 b9 00 00 00 00 00 fc ff df 4c 8b 33 <49> 8d 5c 24 58 48 89 d8 48 c1 e8 03 80 3c 08 00 74 08 48 89 df e8 RSP: 0018:ffff8880aeb09958 EFLAGS: 00000046 RAX: 1ffff110121e6146 RBX: ffff888090f30a30 RCX: dffffc0000000000 RDX: 00000000ffffffff RSI: ffff8880aeb34518 RDI: 0000000000000086 RBP: ffff8880aeb099c8 R08: dffffc0000000000 R09: fffffbfff111a1cf R10: fffffbfff111a1cf R11: 0000000000000000 R12: ffff8880a4dc0200 R13: ffff888090f30a00 R14: 0000001c06d485af R15: 0000000000000008 FS: 00007fb3aec827a0(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9e50001000 CR3: 0000000096e44000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: enqueue_task_fair+0x29e/0x1050 kernel/sched/fair.c:5229 enqueue_task kernel/sched/core.c:1300 [inline] activate_task+0x318/0x3e0 kernel/sched/core.c:1322 attach_task kernel/sched/fair.c:7444 [inline] attach_tasks kernel/sched/fair.c:7479 [inline] load_balance+0x4248/0x5f00 kernel/sched/fair.c:8870 rebalance_domains+0x49b/0x790 kernel/sched/fair.c:9245 run_rebalance_domains+0x1a1/0x290 kernel/sched/fair.c:9893 __do_softirq+0x333/0x7c4 arch/x86/include/asm/paravirt.h:766 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x227/0x230 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x113/0x280 arch/x86/kernel/apic/apic.c:1137 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:756 [inline] RIP: 0010:seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] RIP: 0010:read_seqcount_begin+0x15c/0x1c0 include/linux/seqlock.h:164 Code: c1 e8 03 42 80 3c 38 00 74 0c 48 c7 c7 70 8f 8a 88 e8 48 69 48 00 48 83 3d 90 a6 26 07 00 74 64 e8 69 35 0f 00 4c 89 f7 57 9d <0f> 1f 44 00 00 8b 1d 89 97 29 07 89 de 83 e6 01 31 ff e8 ed 38 0f RSP: 0018:ffff888096f1fd00 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: ffffffff8163e8e7 RBX: ffffffff8163ef3e RCX: ffff888096f101c0 RDX: 0000000000000000 RSI: ffffffff8163ef3e RDI: 0000000000000286 RBP: ffff888096f1fd18 R08: ffff888096f10a18 R09: fffffbfff117c72d R10: fffffbfff117c72d R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: 0000000000000286 R15: dffffc0000000000 ktime_get_ts64+0x6e/0x2c0 kernel/time/timekeeping.c:890 ep_set_mstimeout fs/eventpoll.c:1804 [inline] ep_poll+0x139/0xe80 fs/eventpoll.c:1837 do_epoll_wait+0x1ee/0x260 fs/eventpoll.c:2294 __do_sys_epoll_wait fs/eventpoll.c:2304 [inline] __se_sys_epoll_wait fs/eventpoll.c:2301 [inline] __x64_sys_epoll_wait+0x9a/0xb0 fs/eventpoll.c:2301 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fb3ae396943 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:00007ffefebfa838 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8 RAX: ffffffffffffffda RBX: 0000000000000bb8 RCX: 00007fb3ae396943 RDX: 0000000000000008 RSI: 00007ffefebfa930 RDI: 000000000000000a RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000bb8 R11: 0000000000000246 R12: 0000000000000003 R13: 0000000000000000 R14: 0000000001869ec0 R15: 0000000001851250