audit: type=1400 audit(1577330221.130:41): avc: denied { map } for pid=996 comm="sh" path="/bin/dash" dev="sda1" ino=1473 scontext=system_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 INFO: task kworker/u4:1:23 blocked for more than 140 seconds. Not tainted 4.19.91-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:1 D25256 23 2 0x80000000 Workqueue: netns cleanup_net Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x792/0x1c20 kernel/sched/core.c:3515 schedule+0x7f/0x1b0 kernel/sched/core.c:3559 _synchronize_rcu_expedited+0x5d3/0x8a0 kernel/rcu/tree_exp.h:686 synchronize_rcu_expedited+0x35/0xb0 kernel/rcu/tree_exp.h:795 synchronize_net+0x25/0x30 net/core/dev.c:9085 dev_deactivate_many+0x36c/0x910 net/sched/sch_generic.c:1202 __dev_close_many+0x11c/0x2c0 net/core/dev.c:1475 dev_close_many+0x1e7/0x640 net/core/dev.c:1513 rollback_registered_many+0x282/0xb70 net/core/dev.c:7997 unregister_netdevice_many+0x3e/0x1f0 net/core/dev.c:9130 ip6gre_exit_batch_net+0x3ad/0x5b0 net/ipv6/ip6_gre.c:1624 ops_exit_list.isra.5+0xd9/0x130 net/core/net_namespace.c:156 cleanup_net+0x368/0x850 net/core/net_namespace.c:553 process_one_work+0x835/0x1670 kernel/workqueue.c:2153 worker_thread+0x85/0xb60 kernel/workqueue.c:2296 kthread+0x327/0x3f0 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415 INFO: task kworker/u4:4:662 blocked for more than 140 seconds. Not tainted 4.19.91-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:4 D25080 662 2 0x80000000 Workqueue: events_unbound fsnotify_connector_destroy_workfn Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x792/0x1c20 kernel/sched/core.c:3515 schedule+0x7f/0x1b0 kernel/sched/core.c:3559 schedule_timeout+0x6d7/0xda0 kernel/time/timer.c:1782 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x282/0x460 kernel/sched/completion.c:136 __synchronize_srcu+0x121/0x200 kernel/rcu/srcutree.c:936 synchronize_srcu_expedited kernel/rcu/srcutree.c:961 [inline] synchronize_srcu+0x245/0x3d3 kernel/rcu/srcutree.c:1012 fsnotify_connector_destroy_workfn+0x45/0xa0 fs/notify/mark.c:174 process_one_work+0x835/0x1670 kernel/workqueue.c:2153 worker_thread+0x85/0xb60 kernel/workqueue.c:2296 kthread+0x327/0x3f0 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415 INFO: task kworker/u4:5:10165 blocked for more than 140 seconds. Not tainted 4.19.91-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:5 D25688 10165 2 0x80000000 Workqueue: events_unbound fsnotify_mark_destroy_workfn Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x792/0x1c20 kernel/sched/core.c:3515 schedule+0x7f/0x1b0 kernel/sched/core.c:3559 schedule_timeout+0x6d7/0xda0 kernel/time/timer.c:1782 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x282/0x460 kernel/sched/completion.c:136 __synchronize_srcu+0x121/0x200 kernel/rcu/srcutree.c:936 synchronize_srcu+0x2ee/0x3d3 kernel/rcu/srcutree.c:1014 fsnotify_mark_destroy_workfn+0xfc/0x390 fs/notify/mark.c:795 process_one_work+0x835/0x1670 kernel/workqueue.c:2153 worker_thread+0x85/0xb60 kernel/workqueue.c:2296 kthread+0x327/0x3f0 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415 INFO: task syz-executor.3:3724 blocked for more than 140 seconds. Not tainted 4.19.91-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D27592 3724 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x792/0x1c20 kernel/sched/core.c:3515 schedule+0x7f/0x1b0 kernel/sched/core.c:3559 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3617 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x806/0x1210 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 rtnl_lock net/core/rtnetlink.c:77 [inline] rtnetlink_rcv_msg+0x301/0x8f0 net/core/rtnetlink.c:4765 netlink_rcv_skb+0x145/0x390 net/netlink/af_netlink.c:2454 rtnetlink_rcv+0x10/0x20 net/core/rtnetlink.c:4786 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x44a/0x650 net/netlink/af_netlink.c:1343 netlink_sendmsg+0x765/0xc50 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xb7/0xf0 net/socket.c:632 __sys_sendto+0x1f2/0x2e0 net/socket.c:1787 __do_sys_sendto net/socket.c:1799 [inline] __se_sys_sendto net/socket.c:1795 [inline] __x64_sys_sendto+0xdc/0x1a0 net/socket.c:1795 do_syscall_64+0xd6/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x412b43 Code: c0 0f 84 68 01 00 00 c7 83 00 01 00 00 ff ff ff ff 41 bc 01 00 00 00 f0 4c 0f c1 25 6f ab 24 00 8b 93 04 01 00 00 85 d2 89 54 <24> 0c 0f 8e 2f 02 00 00 4c 8b 7c 24 28 c7 44 24 20 00 00 00 00 41 RSP: 002b:00007ffd2ac4e048 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000412b43 RDX: 0000000000000028 RSI: 0000000000a50070 RDI: 0000000000000003 RBP: 00007ffd2ac4e0b0 R08: 00007ffd2ac4e050 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003 R13: 00000000004149c0 R14: 0000000000000000 R15: 0000000000000000 Showing all locks held in the system: 5 locks held by kworker/u4:1/23: #0: 0000000032e357f4 ((wq_completion)"%s""netns"){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 0000000032e357f4 ((wq_completion)"%s""netns"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 0000000032e357f4 ((wq_completion)"%s""netns"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 0000000032e357f4 ((wq_completion)"%s""netns"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 0000000032e357f4 ((wq_completion)"%s""netns"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 0000000032e357f4 ((wq_completion)"%s""netns"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 0000000032e357f4 ((wq_completion)"%s""netns"){+.+.}, at: process_one_work+0x762/0x1670 kernel/workqueue.c:2124 #1: 000000002618891e (net_cleanup_work){+.+.}, at: process_one_work+0x792/0x1670 kernel/workqueue.c:2128 #2: 000000006a1b4212 (pernet_ops_rwsem){++++}, at: cleanup_net+0xb4/0x850 net/core/net_namespace.c:520 #3: 00000000d05c149c (rtnl_mutex){+.+.}, at: rtnl_lock+0x12/0x20 net/core/rtnetlink.c:77 #4: 0000000035425498 (rcu_preempt_state.exp_mutex){+.+.}, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline] #4: 0000000035425498 (rcu_preempt_state.exp_mutex){+.+.}, at: _synchronize_rcu_expedited+0x3a0/0x8a0 kernel/rcu/tree_exp.h:667 2 locks held by kworker/u4:4/662: #0: 0000000085608e67 ((wq_completion)"events_unbound"){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 0000000085608e67 ((wq_completion)"events_unbound"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 0000000085608e67 ((wq_completion)"events_unbound"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 0000000085608e67 ((wq_completion)"events_unbound"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 0000000085608e67 ((wq_completion)"events_unbound"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 0000000085608e67 ((wq_completion)"events_unbound"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 0000000085608e67 ((wq_completion)"events_unbound"){+.+.}, at: process_one_work+0x762/0x1670 kernel/workqueue.c:2124 #1: 0000000086b33346 (connector_reaper_work){+.+.}, at: process_one_work+0x792/0x1670 kernel/workqueue.c:2128 1 lock held by khungtaskd/1037: #0: 000000004654bfea (rcu_read_lock){....}, at: debug_show_all_locks+0x5b/0x27a kernel/locking/lockdep.c:4438 3 locks held by kworker/0:2/3223: #0: 00000000a6d89745 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 00000000a6d89745 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 00000000a6d89745 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 00000000a6d89745 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 00000000a6d89745 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 00000000a6d89745 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 00000000a6d89745 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: process_one_work+0x762/0x1670 kernel/workqueue.c:2124 #1: 00000000c63314bd ((addr_chk_work).work){+.+.}, at: process_one_work+0x792/0x1670 kernel/workqueue.c:2128 #2: 00000000d05c149c (rtnl_mutex){+.+.}, at: rtnl_lock+0x12/0x20 net/core/rtnetlink.c:77 1 lock held by rsyslogd/6683: #0: 000000005b3b07af (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xa7/0xd0 fs/file.c:767 2 locks held by getty/6806: #0: 000000003e8e1a71 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000e4620798 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x1ee/0x1910 drivers/tty/n_tty.c:2154 2 locks held by getty/6807: #0: 0000000052dad7e0 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000d8efd442 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x1ee/0x1910 drivers/tty/n_tty.c:2154 2 locks held by getty/6808: #0: 0000000061c62ef6 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000cef8bc16 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x1ee/0x1910 drivers/tty/n_tty.c:2154 2 locks held by getty/6809: #0: 000000007c328429 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000e2d25f67 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x1ee/0x1910 drivers/tty/n_tty.c:2154 2 locks held by getty/6810: #0: 0000000062027fb1 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 000000009bfbc790 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x1ee/0x1910 drivers/tty/n_tty.c:2154 2 locks held by getty/6811: #0: 0000000079853dd9 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 000000000ff9c6d4 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x1ee/0x1910 drivers/tty/n_tty.c:2154 2 locks held by getty/6812: #0: 00000000c15d793a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000f2b3c52e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x1ee/0x1910 drivers/tty/n_tty.c:2154 3 locks held by kworker/1:4/6941: 2 locks held by kworker/u4:5/10165: #0: 0000000085608e67 ((wq_completion)"events_unbound"){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 0000000085608e67 ((wq_completion)"events_unbound"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 0000000085608e67 ((wq_completion)"events_unbound"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 0000000085608e67 ((wq_completion)"events_unbound"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 0000000085608e67 ((wq_completion)"events_unbound"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 0000000085608e67 ((wq_completion)"events_unbound"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 0000000085608e67 ((wq_completion)"events_unbound"){+.+.}, at: process_one_work+0x762/0x1670 kernel/workqueue.c:2124 #1: 00000000eb34ad0c ((reaper_work).work){+.+.}, at: process_one_work+0x792/0x1670 kernel/workqueue.c:2128 1 lock held by syz-executor.3/3660: #0: 00000000a8689860 (&rtc->ops_lock){+.+.}, at: rtc_dev_ioctl+0xe0/0x6e0 drivers/rtc/rtc-dev.c:219 1 lock held by syz-executor.3/3724: #0: 00000000d05c149c (rtnl_mutex){+.+.}, at: rtnl_lock net/core/rtnetlink.c:77 [inline] #0: 00000000d05c149c (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x301/0x8f0 net/core/rtnetlink.c:4765 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1037 Comm: khungtaskd Not tainted 4.19.91-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+0x123/0x177 lib/dump_stack.c:118 nmi_cpu_backtrace.cold.4+0x3e/0x76 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0xe6/0x11a lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x5c3/0xb40 kernel/hung_task.c:287 kthread+0x327/0x3f0 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 6941 Comm: kworker/1:4 Not tainted 4.19.91-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events rtc_timer_do_work RIP: 0010:rtc_handle_legacy_irq+0x43/0xc0 drivers/rtc/interface.c:624 Code: f7 53 89 f3 48 83 ec 08 e8 1a 99 34 02 49 8d bc 24 50 05 00 00 48 ba 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 80 3c 11 00 <75> 68 c1 e3 08 41 80 cd 80 48 89 c6 48 63 db 49 03 9c 24 50 05 00 RSP: 0018:ffff88809a357b78 EFLAGS: 00000046 RAX: 0000000000000282 RBX: 0000000000000001 RCX: 1ffff1104309355a RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffff88821849aad0 RBP: ffff88809a357ba0 R08: ffffed104309355c R09: ffffed104309355b R10: ffffed104309355b R11: ffff88821849aadb R12: ffff88821849a580 R13: 0000000000000010 R14: ffff88821849aad8 R15: ffffffff88b2b220 FS: 0000000000000000(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9db8d0b000 CR3: 0000000007e6d000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rtc_uie_update_irq+0x13/0x20 drivers/rtc/interface.c:654 rtc_timer_do_work+0x1bb/0xb00 drivers/rtc/interface.c:935 process_one_work+0x835/0x1670 kernel/workqueue.c:2153 worker_thread+0x85/0xb60 kernel/workqueue.c:2296 kthread+0x327/0x3f0 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415