blk_update_request: I/O error, dev loop5, sector 0 Buffer I/O error on dev loop5p1, logical block 0, async page read blk_update_request: I/O error, dev loop5, sector 0 Buffer I/O error on dev loop5p1, logical block 0, async page read Buffer I/O error on dev loop5p1, logical block 0, async page read INFO: task init:8723 blocked for more than 140 seconds. Not tainted 4.9.194+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. init D29304 8723 1 0x00000000 0000000000000087 ffff8801c6cc0000 ffff8801d5d5f380 ffff8801db721000 ffff8801a2de4740 ffff8801db721018 ffff8801d6b77758 ffffffff8281af8e ffff88010000000d 1ffff1003ad6eed4 00ffe8ffffd14bd0 ffff8801db7218f0 Call Trace: [<00000000cdc8a5bb>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<000000002a200c13>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579 [<00000000fe946afc>] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [<00000000fe946afc>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621 [<00000000e3fea8af>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] [<00000000e3fea8af>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 [<0000000099812416>] chrdev_open+0x230/0x630 fs/char_dev.c:398 [<00000000c9cf3163>] do_dentry_open+0x422/0xd20 fs/open.c:791 [<0000000064a073dd>] vfs_open+0x105/0x230 fs/open.c:904 [<00000000693142d5>] do_last fs/namei.c:3541 [inline] [<00000000693142d5>] path_openat+0xbf5/0x2f60 fs/namei.c:3665 [<0000000088dfd458>] do_filp_open+0x1a1/0x280 fs/namei.c:3699 [<000000005f138c00>] do_sys_open+0x2f0/0x610 fs/open.c:1097 [<00000000bd812a27>] SYSC_open fs/open.c:1115 [inline] [<00000000bd812a27>] SyS_open+0x2d/0x40 fs/open.c:1110 [<00000000dbed59e3>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<000000002119117b>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Showing all locks held in the system: 2 locks held by khungtaskd/24: #0: (rcu_read_lock){......}, at: [<00000000626651d3>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline] #0: (rcu_read_lock){......}, at: [<00000000626651d3>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263 #1: (tasklist_lock){.+.+..}, at: [<0000000078f16acc>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4336 1 lock held by rsyslogd/1899: #0: (&f->f_pos_lock){+.+.+.}, at: [<00000000f063bc45>] __fdget_pos+0xa8/0xd0 fs/file.c:782 2 locks held by getty/2026: #0: (&tty->ldisc_sem){++++++}, at: [<0000000016a6fc94>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376 #1: (&ldata->atomic_read_lock){+.+...}, at: [<00000000eb1b6e12>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 1 lock held by init/8723: #0: (tty_mutex){+.+.+.}, at: [<00000000e3fea8af>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<00000000e3fea8af>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 1 lock held by init/8724: #0: (tty_mutex){+.+.+.}, at: [<00000000e3fea8af>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<00000000e3fea8af>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 1 lock held by init/8725: #0: (tty_mutex){+.+.+.}, at: [<00000000e3fea8af>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<00000000e3fea8af>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 1 lock held by init/8726: #0: (tty_mutex){+.+.+.}, at: [<00000000e3fea8af>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<00000000e3fea8af>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 1 lock held by init/8727: #0: (tty_mutex){+.+.+.}, at: [<00000000e3fea8af>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<00000000e3fea8af>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 24 Comm: khungtaskd Not tainted 4.9.194+ #0 ffff8801d98d7cc8 ffffffff81b67001 0000000000000000 0000000000000000 0000000000000000 ffffffff81099d01 dffffc0000000000 ffff8801d98d7d00 ffffffff81b7229c 0000000000000000 0000000000000000 0000000000000000 Call Trace: [<000000004710eee3>] __dump_stack lib/dump_stack.c:15 [inline] [<000000004710eee3>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<00000000bba304af>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<000000007a5f1f35>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<00000000253ccee0>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<00000000c528965e>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<00000000c528965e>] check_hung_task kernel/hung_task.c:126 [inline] [<00000000c528965e>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline] [<00000000c528965e>] watchdog+0x670/0xaf0 kernel/hung_task.c:263 [<00000000061e91e5>] kthread+0x278/0x310 kernel/kthread.c:211 [<00000000a98b8733>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:375 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 470 Comm: udevd Not tainted 4.9.194+ #0 task: 00000000dc02e104 task.stack: 000000004e9b363c RIP: 0033:[<0000000000404fe3>] c [<00000000ed78da87>] 0x404fe3 RSP: 002b:00007ffc7d8d0910 EFLAGS: 00000202 RAX: 0000000000000001 RBX: 00000000018a6e10 RCX: 0000000000000007 RDX: 0000000000000000 RSI: 00000000018a3560 RDI: 000000000168d0f0 RBP: 0000000000f0d120 R08: 0000000000000024 R09: 0000000000000001 R10: 000000000000001c R11: 00000000018a3544 R12: 00000000000031ae R13: 000000000168d0d4 R14: 0000000000000000 R15: 0000000000000705 FS: 00007ffb68ad77a0(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000b9d1e0 CR3: 00000001d3ae7000 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400