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:25629 blocked for more than 140 seconds. Not tainted 4.9.190+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. init D29128 25629 1 0x00000000 0000000000000087 ffff8801cad2c740 ffff8801d6a38b00 ffff8801db621000 ffff8801c7bac740 ffff8801db621018 ffff88019cfcf758 ffffffff8281a10e ffff88019cfcf698 ffffffff81249481 00ff88019cfcf750 ffff8801db6218f0 Call Trace: [<000000003b4b08a7>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<00000000a747cbfc>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579 [<00000000ce6b32fe>] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [<00000000ce6b32fe>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621 [<0000000028adc28c>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] [<0000000028adc28c>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 [<00000000b055b394>] chrdev_open+0x230/0x630 fs/char_dev.c:398 [<0000000025b5e577>] do_dentry_open+0x422/0xd20 fs/open.c:791 [<000000003a08f7b0>] vfs_open+0x105/0x230 fs/open.c:904 [<000000000ba28e72>] do_last fs/namei.c:3541 [inline] [<000000000ba28e72>] path_openat+0xbf5/0x2f60 fs/namei.c:3665 [<00000000e8cae36c>] do_filp_open+0x1a1/0x280 fs/namei.c:3699 [<0000000075a093b9>] do_sys_open+0x2f0/0x610 fs/open.c:1097 [<000000002c2860cd>] SYSC_open fs/open.c:1115 [inline] [<000000002c2860cd>] SyS_open+0x2d/0x40 fs/open.c:1110 [<00000000968e1cc8>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<00000000466c1225>] 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: [<000000003d8289f0>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline] #0: (rcu_read_lock){......}, at: [<000000003d8289f0>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263 #1: (tasklist_lock){.+.+..}, at: [<0000000066bc30cc>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4336 1 lock held by rsyslogd/1897: #0: (&f->f_pos_lock){+.+.+.}, at: [<00000000d8b7989a>] __fdget_pos+0xa8/0xd0 fs/file.c:782 2 locks held by getty/2026: #0: (&tty->ldisc_sem){++++++}, at: [<000000000b0ed591>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376 #1: (&ldata->atomic_read_lock){+.+...}, at: [<00000000539abae5>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 1 lock held by init/25629: #0: (tty_mutex){+.+.+.}, at: [<0000000028adc28c>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<0000000028adc28c>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 1 lock held by init/25631: #0: (tty_mutex){+.+.+.}, at: [<0000000028adc28c>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<0000000028adc28c>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 1 lock held by init/25632: #0: (tty_mutex){+.+.+.}, at: [<0000000028adc28c>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<0000000028adc28c>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 1 lock held by init/25633: #0: (tty_mutex){+.+.+.}, at: [<0000000028adc28c>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<0000000028adc28c>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 1 lock held by init/25954: #0: (tty_mutex){+.+.+.}, at: [<0000000028adc28c>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<0000000028adc28c>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 1 lock held by syz-executor.2/28556: #0: (tty_mutex){+.+.+.}, at: [<0000000003422ef2>] ptmx_open drivers/tty/pty.c:753 [inline] #0: (tty_mutex){+.+.+.}, at: [<0000000003422ef2>] ptmx_open+0xe5/0x310 drivers/tty/pty.c:720 1 lock held by syz-executor.2/28644: #0: (tty_mutex){+.+.+.}, at: [<0000000003422ef2>] ptmx_open drivers/tty/pty.c:753 [inline] #0: (tty_mutex){+.+.+.}, at: [<0000000003422ef2>] ptmx_open+0xe5/0x310 drivers/tty/pty.c:720 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.190+ #0 ffff8801d98d7cc8 ffffffff81b66c51 0000000000000001 0000000000000000 0000000000000001 ffffffff81099a01 dffffc0000000000 ffff8801d98d7d00 ffffffff81b71eec 0000000000000001 0000000000000000 0000000000000001 Call Trace: [<000000007a1a0148>] __dump_stack lib/dump_stack.c:15 [inline] [<000000007a1a0148>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<00000000825071fa>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<00000000f1f718c9>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<00000000dc9d5d31>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<0000000000a149ab>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<0000000000a149ab>] check_hung_task kernel/hung_task.c:126 [inline] [<0000000000a149ab>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline] [<0000000000a149ab>] watchdog+0x670/0xaf0 kernel/hung_task.c:263 [<00000000cf464e78>] kthread+0x278/0x310 kernel/kthread.c:211 [<0000000080c3733b>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:375 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 25628 Comm: init Not tainted 4.9.190+ #0 task: 00000000459b850d task.stack: 00000000fc0ba0f9 RIP: 0010:[] c [<00000000af509c0f>] io_serial_in+0x6b/0x90 drivers/tty/serial/8250/8250_port.c:414 RSP: 0018:ffff88019c9af570 EFLAGS: 00000002 RAX: dffffc0000000000 RBX: 00000000000003fd RCX: 0000000000000000 RDX: 00000000000003fd RSI: ffffffff81d868d1 RDI: ffffffff84b67e18 RBP: ffff88019c9af580 R08: 0000000000000001 R09: 000000000000541c R10: ffff8801cc42a0c0 R11: 0000000000000001 R12: ffffffff84b67de0 R13: 0000000000000020 R14: fffffbfff096d003 R15: fffffbfff096cfc5 FS: 00007f8c14fa27a0(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000253ef50 CR3: 00000001ca9e3000 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Stack: ffffffff84b67de0c 0000000000002707c ffff88019c9af5d0c ffffffff81d88b74c ffff88019c9af608c ffffffff84b67e28c ffffffff84b6801ac ffffffff841d658ac ffffffff84b67de0c 0000000000000035c dffffc0000000000c 0000000000000035c Call Trace: [<00000000f4c4bd88>] serial_in drivers/tty/serial/8250/8250.h:111 [inline] [<00000000f4c4bd88>] wait_for_xmitr+0x94/0x1e0 drivers/tty/serial/8250/8250_port.c:1997 [<00000000f354b0ce>] serial8250_console_putchar+0x20/0x60 drivers/tty/serial/8250/8250_port.c:3103 [<00000000e206b52c>] uart_console_write+0x56/0xe0 drivers/tty/serial/serial_core.c:1885 [<00000000e1b885a2>] serial8250_console_write+0x2fb/0x860 drivers/tty/serial/8250/8250_port.c:3169 [<00000000e7e00897>] univ8250_console_write+0x5f/0x70 drivers/tty/serial/8250/8250_core.c:594 [<00000000d96df990>] call_console_drivers.isra.0.constprop.0+0x1ac/0x360 kernel/printk/printk.c:1594 [<000000004f1a23b5>] console_unlock+0x47c/0xb20 kernel/printk/printk.c:2454 [<0000000075a5b415>] console_device+0x97/0xc0 kernel/printk/printk.c:2562 [<00000000353088a6>] tty_lookup_driver drivers/tty/tty_io.c:2018 [inline] [<00000000353088a6>] tty_open_by_driver drivers/tty/tty_io.c:2063 [inline] [<00000000353088a6>] tty_open+0x796/0xe10 drivers/tty/tty_io.c:2140 [<00000000b055b394>] chrdev_open+0x230/0x630 fs/char_dev.c:398 [<0000000025b5e577>] do_dentry_open+0x422/0xd20 fs/open.c:791 [<000000003a08f7b0>] vfs_open+0x105/0x230 fs/open.c:904 [<000000000ba28e72>] do_last fs/namei.c:3541 [inline] [<000000000ba28e72>] path_openat+0xbf5/0x2f60 fs/namei.c:3665 [<00000000e8cae36c>] do_filp_open+0x1a1/0x280 fs/namei.c:3699 [<0000000075a093b9>] do_sys_open+0x2f0/0x610 fs/open.c:1097 [<000000002c2860cd>] SYSC_open fs/open.c:1115 [inline] [<000000002c2860cd>] SyS_open+0x2d/0x40 fs/open.c:1110 [<00000000968e1cc8>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<00000000466c1225>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Code: c24 cc9 c00 c00 c00 c49 c8d c7c c24 c38 c48 cb8 c00 c00 c00 c00 c00 cfc cff cdf c48 c89 cfa c48 cc1 cea c03 cd3 ce3 c80 c3c c02 c00 c75 c17 c41 c03 c5c c24 c38 c89 cda cec c<5b> c0f cb6 cc0 c41 c5c c5d cc3 ce8 c68 c7b c77 cff ceb cc2 ce8 cc1 c7b c77 cff ceb c