INFO: task kworker/0:3:8831 blocked for more than 143 seconds. Not tainted 5.2.0-rc1+ #6 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/0:3 D26528 8831 2 0x80004000 Workqueue: events linkwatch_event Call Trace: context_switch kernel/sched/core.c:2818 [inline] __schedule+0x7cb/0x1560 kernel/sched/core.c:3445 schedule+0xa8/0x260 kernel/sched/core.c:3509 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3568 __mutex_lock_common kernel/locking/mutex.c:1003 [inline] __mutex_lock+0x726/0x1310 kernel/locking/mutex.c:1073 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1088 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:76 linkwatch_event+0xf/0x70 net/core/link_watch.c:236 process_one_work+0x989/0x1790 kernel/workqueue.c:2269 worker_thread+0x98/0xe40 kernel/workqueue.c:2415 kthread+0x354/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 INFO: task kworker/0:6:14540 blocked for more than 143 seconds. Not tainted 5.2.0-rc1+ #6 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/0:6 D26296 14540 2 0x80004000 Workqueue: events switchdev_deferred_process_work Call Trace: context_switch kernel/sched/core.c:2818 [inline] __schedule+0x7cb/0x1560 kernel/sched/core.c:3445 schedule+0xa8/0x260 kernel/sched/core.c:3509 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3568 __mutex_lock_common kernel/locking/mutex.c:1003 [inline] __mutex_lock+0x726/0x1310 kernel/locking/mutex.c:1073 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1088 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:76 switchdev_deferred_process_work+0xe/0x20 net/switchdev/switchdev.c:78 process_one_work+0x989/0x1790 kernel/workqueue.c:2269 worker_thread+0x98/0xe40 kernel/workqueue.c:2415 kthread+0x354/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Showing all locks held in the system: 1 lock held by khungtaskd/1040: #0: 0000000030728d93 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5149 4 locks held by kworker/u4:3/2529: 1 lock held by rsyslogd/8668: #0: 00000000b1c97469 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 2 locks held by getty/8779: #0: 00000000c90984f8 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000007fa3c317 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8780: #0: 0000000015ff378e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000000e6b6d4 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8781: #0: 00000000dd2598f4 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000389dba14 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8782: #0: 00000000eda9b50f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000092c6df1b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8783: #0: 00000000a229e02b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000984b1817 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8784: #0: 000000005ecebe6b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000c2220f6d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8785: #0: 0000000057f6fa0b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000c3635ad6 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 3 locks held by kworker/0:3/8831: #0: 000000004fc32041 ((wq_completion)events){+.+.}, at: __write_once_size include/linux/compiler.h:221 [inline] #0: 000000004fc32041 ((wq_completion)events){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 000000004fc32041 ((wq_completion)events){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: 000000004fc32041 ((wq_completion)events){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: 000000004fc32041 ((wq_completion)events){+.+.}, at: set_work_data kernel/workqueue.c:620 [inline] #0: 000000004fc32041 ((wq_completion)events){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline] #0: 000000004fc32041 ((wq_completion)events){+.+.}, at: process_one_work+0x87e/0x1790 kernel/workqueue.c:2240 #1: 000000005c6b5cbd ((linkwatch_work).work){+.+.}, at: process_one_work+0x8b4/0x1790 kernel/workqueue.c:2244 #2: 00000000eafaa8c0 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:76 3 locks held by kworker/u4:6/8894: 2 locks held by kworker/1:6/14503: #0: 000000006ecedf27 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1168 [inline] #0: 000000006ecedf27 (&rq->lock){-.-.}, at: __schedule+0x1f5/0x1560 kernel/sched/core.c:3397 #1: 0000000030728d93 (rcu_read_lock){....}, at: trace_sched_stat_runtime include/trace/events/sched.h:435 [inline] #1: 0000000030728d93 (rcu_read_lock){....}, at: update_curr+0x2ce/0x8a0 kernel/sched/fair.c:842 3 locks held by kworker/0:5/14539: #0: 0000000078956349 ((wq_completion)ipv6_addrconf){+.+.}, at: __write_once_size include/linux/compiler.h:221 [inline] #0: 0000000078956349 ((wq_completion)ipv6_addrconf){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 0000000078956349 ((wq_completion)ipv6_addrconf){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: 0000000078956349 ((wq_completion)ipv6_addrconf){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: 0000000078956349 ((wq_completion)ipv6_addrconf){+.+.}, at: set_work_data kernel/workqueue.c:620 [inline] #0: 0000000078956349 ((wq_completion)ipv6_addrconf){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline] #0: 0000000078956349 ((wq_completion)ipv6_addrconf){+.+.}, at: process_one_work+0x87e/0x1790 kernel/workqueue.c:2240 #1: 000000009db1a1f9 ((addr_chk_work).work){+.+.}, at: process_one_work+0x8b4/0x1790 kernel/workqueue.c:2244 #2: 00000000eafaa8c0 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:76 3 locks held by kworker/0:6/14540: #0: 000000004fc32041 ((wq_completion)events){+.+.}, at: __write_once_size include/linux/compiler.h:221 [inline] #0: 000000004fc32041 ((wq_completion)events){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 000000004fc32041 ((wq_completion)events){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: 000000004fc32041 ((wq_completion)events){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: 000000004fc32041 ((wq_completion)events){+.+.}, at: set_work_data kernel/workqueue.c:620 [inline] #0: 000000004fc32041 ((wq_completion)events){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline] #0: 000000004fc32041 ((wq_completion)events){+.+.}, at: process_one_work+0x87e/0x1790 kernel/workqueue.c:2240 #1: 00000000cc3a1930 (deferred_process_work){+.+.}, at: process_one_work+0x8b4/0x1790 kernel/workqueue.c:2244 #2: 00000000eafaa8c0 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:76 2 locks held by syz-executor.4/19435: 2 locks held by syz-executor.1/19443: 1 lock held by syz-executor.0/19444: #0: 00000000eafaa8c0 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:76 3 locks held by syz-executor.3/19445: 2 locks held by syz-executor.5/19611: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1040 Comm: khungtaskd Not tainted 5.2.0-rc1+ #6 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+0x172/0x1f0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1be/0x236 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:205 [inline] watchdog+0x9b7/0xec0 kernel/hung_task.c:289 kthread+0x354/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.233 msecs NMI backtrace for cpu 1 CPU: 1 PID: 19443 Comm: syz-executor.1 Not tainted 5.2.0-rc1+ #6 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_acquire+0xb1c/0x5490 kernel/locking/lockdep.c:3653 Code: ff 0f 84 f9 d2 00 00 45 31 ff 48 b8 00 00 00 00 00 fc ff df 48 03 84 24 90 00 00 00 48 c7 00 00 00 00 00 c7 40 08 00 00 00 00 <48> c7 40 10 00 00 00 00 44 89 f8 48 8b 9c 24 78 01 00 00 65 48 33 RSP: 0018:ffff888062ffec10 EFLAGS: 00000086 RAX: ffffed100c5ffd96 RBX: ffffffff8a2ee6b0 RCX: ffff888071f66a40 RDX: 1ffff1100e3ecd47 RSI: 0000000000000001 RDI: ffffffff8a2ee6f0 RBP: ffff888062ffedb8 R08: 000000006aa232c8 R09: ffff888071f66a88 R10: ffff888071f66a68 R11: ffff888071f661c0 R12: ffff888071f66a60 R13: 00000000afbbc295 R14: ffffffff8980bbf0 R15: 0000000000000001 FS: 0000555555c64940(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000000611d9000 CR4: 00000000001406e0 Call Trace: lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:4303 rcu_lock_acquire include/linux/rcupdate.h:210 [inline] rcu_read_lock+0x29/0x70 include/linux/rcupdate.h:595 mem_cgroup_iter+0x19a/0xb00 mm/memcontrol.c:1022 shrink_node+0x3fa/0x1570 mm/vmscan.c:2689 shrink_zones mm/vmscan.c:2895 [inline] do_try_to_free_pages+0x3cb/0x11e0 mm/vmscan.c:2953 try_to_free_mem_cgroup_pages+0x2dd/0x9f0 mm/vmscan.c:3249 try_charge+0x564/0x15c0 mm/memcontrol.c:2341 __memcg_kmem_charge_memcg+0x7c/0x130 mm/memcontrol.c:2698 memcg_kmem_charge_memcg include/linux/memcontrol.h:1307 [inline] memcg_charge_slab mm/slab.h:282 [inline] kmem_getpages mm/slab.c:1379 [inline] cache_grow_begin+0x402/0x650 mm/slab.c:2606 fallback_alloc+0x1fd/0x2d0 mm/slab.c:3153 ____cache_alloc_node+0x1be/0x1e0 mm/slab.c:3221 __do_cache_alloc mm/slab.c:3290 [inline] slab_alloc mm/slab.c:3318 [inline] kmem_cache_alloc+0x1e8/0x6f0 mm/slab.c:3488 ext4_alloc_inode+0x1f/0x640 fs/ext4/super.c:1073 alloc_inode+0x68/0x1e0 fs/inode.c:227 iget_locked+0x196/0x4a0 fs/inode.c:1181 __ext4_iget+0x273/0x3f10 fs/ext4/inode.c:4847 ext4_lookup fs/ext4/namei.c:1649 [inline] ext4_lookup+0x39e/0x760 fs/ext4/namei.c:1624 __lookup_slow+0x279/0x500 fs/namei.c:1669 lookup_slow+0x58/0x80 fs/namei.c:1686 mountpoint_last fs/namei.c:2663 [inline] path_mountpoint+0x5d2/0x1e60 fs/namei.c:2693 filename_mountpoint+0x190/0x3c0 fs/namei.c:2715 user_path_mountpoint_at+0x3a/0x50 fs/namei.c:2745 ksys_umount+0x167/0xf00 fs/namespace.c:1688 __do_sys_umount fs/namespace.c:1714 [inline] __se_sys_umount fs/namespace.c:1712 [inline] __x64_sys_umount+0x54/0x80 fs/namespace.c:1712 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45bca7 Code: 64 89 04 25 d0 02 00 00 58 5f ff d0 48 89 c7 e8 2f be ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 9d 8d fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fff6ee63d88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6 RAX: ffffffffffffffda RBX: 000000000006ce10 RCX: 000000000045bca7 RDX: 00000000004036a0 RSI: 0000000000000002 RDI: 00007fff6ee63e30 RBP: 0000000000000021 R08: 0000000000000000 R09: 000000000000000f R10: 000000000000000a R11: 0000000000000206 R12: 00007fff6ee64ec0 R13: 0000555555c65940 R14: 0000000000000000 R15: 00007fff6ee64ec0