IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready INFO: task syz-executor5:11667 blocked for more than 140 seconds. Not tainted 4.9.113-g9905591 #14 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor5 D28888 11667 10445 0x00000004 ffff8801d05d1800 0000000000000000 ffff8801c5aa0fc0 ffff8801d9a6b000 ffff8801db321c18 ffff8801d7fc7650 ffffffff839e929d ffff8801cbd89d60 ffffed00397b139c ffff8801d7fc7600 00ffffff839eb0c5 ffff8801db3224e8 Call Trace: [] schedule+0x7f/0x1b0 kernel/sched/core.c:3553 [] d_wait_lookup fs/dcache.c:2455 [inline] [] d_alloc_parallel+0xeb2/0x17c0 fs/dcache.c:2537 [] lookup_slow+0x19c/0x470 fs/namei.c:1650 [] walk_component+0x716/0x1bb0 fs/namei.c:1784 [] lookup_last fs/namei.c:2266 [inline] [] path_lookupat.isra.41+0x186/0x410 fs/namei.c:2283 [] filename_lookup.part.55+0x177/0x370 fs/namei.c:2317 [] filename_lookup fs/namei.c:2310 [inline] [] user_path_at_empty+0x53/0x70 fs/namei.c:2578 [] user_path_at include/linux/namei.h:55 [inline] [] vfs_fstatat+0xc6/0x170 fs/stat.c:106 [] vfs_stat fs/stat.c:123 [inline] [] SYSC_newstat+0x86/0xf0 fs/stat.c:270 [] SyS_newstat+0x1d/0x30 fs/stat.c:266 [] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Showing all locks held in the system: 2 locks held by khungtaskd/519: #0: (rcu_read_lock){......}, at: [] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline] #0: (rcu_read_lock){......}, at: [] watchdog+0x11c/0xa20 kernel/hung_task.c:239 #1: (tasklist_lock){.+.+..}, at: [] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336 1 lock held by rsyslogd/3542: #0: (&f->f_pos_lock){+.+.+.}, at: [] __fdget_pos+0xac/0xd0 fs/file.c:781 2 locks held by getty/3637: #0: (&tty->ldisc_sem){++++++}, at: [] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+...}, at: [] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142 1 lock held by syz-executor5/11581: #0: (&sb->s_type->i_mutex_key#23){++++.+}, at: [] inode_lock_shared include/linux/fs.h:776 [inline] #0: (&sb->s_type->i_mutex_key#23){++++.+}, at: [] lookup_slow+0x141/0x470 fs/namei.c:1645 1 lock held by syz-executor5/11667: #0: (&sb->s_type->i_mutex_key#23){++++.+}, at: [] inode_lock_shared include/linux/fs.h:776 [inline] #0: (&sb->s_type->i_mutex_key#23){++++.+}, at: [] lookup_slow+0x141/0x470 fs/namei.c:1645 1 lock held by syz-executor5/11668: #0: (&sb->s_type->i_mutex_key#23){++++.+}, at: [] inode_lock_shared include/linux/fs.h:776 [inline] #0: (&sb->s_type->i_mutex_key#23){++++.+}, at: [] lookup_slow+0x141/0x470 fs/namei.c:1645 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 519 Comm: khungtaskd Not tainted 4.9.113-g9905591 #14 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801d843fd08 ffffffff81eb32a9 0000000000000000 0000000000000000 0000000000000000 0000000000000001 ffffffff810b9bd0 ffff8801d843fd40 ffffffff81ebe5a7 0000000000000000 0000000000000000 0000000000000003 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99 [] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60 [] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [] check_hung_task kernel/hung_task.c:125 [inline] [] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline] [] watchdog+0x6b4/0xa20 kernel/hung_task.c:239 [] kthread+0x26d/0x300 kernel/kthread.c:211 [] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff839f8da6