protocol 88fb is buggy, dev hsr_slave_1 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 INFO: task syz-executor.4:24010 blocked for more than 140 seconds. Not tainted 4.19.60 #33 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D27656 24010 7943 0x00000004 Call Trace: context_switch /kernel/sched/core.c:2826 [inline] __schedule+0x80d/0x1c70 /kernel/sched/core.c:3474 schedule+0x92/0x1c0 /kernel/sched/core.c:3518 schedule_timeout+0x8c8/0xfc0 /kernel/time/timer.c:1780 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+0x29c/0x440 /kernel/sched/completion.c:136 __flush_work+0x49f/0x880 /kernel/workqueue.c:2920 __cancel_work_timer+0x3bf/0x520 /kernel/workqueue.c:3007 cancel_work_sync+0x18/0x20 /kernel/workqueue.c:3043 p9_conn_destroy /net/9p/trans_fd.c:883 [inline] p9_fd_close+0x329/0x570 /net/9p/trans_fd.c:913 p9_client_create+0x98c/0x1400 /net/9p/client.c:1083 v9fs_session_init+0x1e7/0x18c0 /fs/9p/v9fs.c:421 v9fs_mount+0x7d/0x920 /fs/9p/vfs_super.c:135 mount_fs+0xa8/0x32b /fs/super.c:1261 vfs_kern_mount.part.0+0x6f/0x410 /fs/namespace.c:961 vfs_kern_mount /fs/namespace.c:951 [inline] do_new_mount /fs/namespace.c:2469 [inline] do_mount+0x53e/0x2bc0 /fs/namespace.c:2799 ksys_mount+0xdb/0x150 /fs/namespace.c:3015 __do_sys_mount /fs/namespace.c:3029 [inline] __se_sys_mount /fs/namespace.c:3026 [inline] __x64_sys_mount+0xbe/0x150 /fs/namespace.c:3026 do_syscall_64+0xfd/0x620 /arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459819 Code: 83 c7 01 48 39 d7 72 c2 c5 f8 77 49 c7 03 ff ff ff ff c3 c5 f8 77 eb 60 80 3d 9c a1 36 01 01 0f 85 7f fd ff ff 48 83 f8 0c 0f <83> 74 fe ff ff 48 8d 75 10 66 f7 c6 f0 0f 0f 84 66 fd ff ff f3 0f RSP: 002b:00007f8874f9ec78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000459819 RDX: 0000000020000100 RSI: 0000000020000040 RDI: 0000000000000000 RBP: 000000000075c268 R08: 0000000020000280 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8874f9f6d4 R13: 00000000004c5c6d R14: 00000000004da4c8 R15: 00000000ffffffff Showing all locks held in the system: 2 locks held by kworker/0:0/5: #0: 00000000f18228d9 ((wq_completion)"events"){+.+.}, at: __write_once_size /./include/linux/compiler.h:220 [inline] #0: 00000000f18228d9 ((wq_completion)"events"){+.+.}, at: arch_atomic64_set /./arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 00000000f18228d9 ((wq_completion)"events"){+.+.}, at: atomic64_set /./include/asm-generic/atomic-instrumented.h:40 [inline] #0: 00000000f18228d9 ((wq_completion)"events"){+.+.}, at: atomic_long_set /./include/asm-generic/atomic-long.h:59 [inline] #0: 00000000f18228d9 ((wq_completion)"events"){+.+.}, at: set_work_data /kernel/workqueue.c:617 [inline] #0: 00000000f18228d9 ((wq_completion)"events"){+.+.}, at: set_work_pool_and_clear_pending /kernel/workqueue.c:644 [inline] #0: 00000000f18228d9 ((wq_completion)"events"){+.+.}, at: process_one_work+0x87e/0x1750 /kernel/workqueue.c:2124 #1: 0000000018f0ed89 ((work_completion)(&m->wq)){+.+.}, at: process_one_work+0x8b4/0x1750 /kernel/workqueue.c:2128 1 lock held by khungtaskd/1034: #0: 0000000014262f5a (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e /kernel/locking/lockdep.c:4435 1 lock held by rsyslogd/7768: #0: 00000000d9dbe3c4 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 /fs/file.c:767 2 locks held by getty/7889: #0: 0000000010b17bfa (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:363 #1: 00000000dbb4b775 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 /drivers/tty/n_tty.c:2154 2 locks held by getty/7890: #0: 0000000006d37532 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:363 #1: 000000000ad6f304 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 /drivers/tty/n_tty.c:2154 2 locks held by getty/7891: #0: 000000001eee6ad7 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:363 #1: 00000000dcce932c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 /drivers/tty/n_tty.c:2154 2 locks held by getty/7892: #0: 00000000b32ddff0 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:363 #1: 00000000a7f3b13d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 /drivers/tty/n_tty.c:2154 2 locks held by getty/7893: #0: 0000000099136187 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:363 #1: 00000000b23f3451 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 /drivers/tty/n_tty.c:2154 2 locks held by getty/7894: #0: 0000000071f4c090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:363 #1: 000000007a0c8776 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 /drivers/tty/n_tty.c:2154 2 locks held by getty/7895: #0: 00000000a7db3e7f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 /drivers/tty/tty_ldsem.c:363 #1: 0000000093f85a37 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 /drivers/tty/n_tty.c:2154 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1034 Comm: khungtaskd Not tainted 4.19.60 #33 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+0x1b0/0x1f8 /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+0x9df/0xee0 /kernel/hung_task.c:287 kthread+0x354/0x420 /kernel/kthread.c:246 ret_from_fork+0x24/0x30 /arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0xe/0x10 /./arch/x86/include/asm/irqflags.h:60