loop2: p251 start 1854537728 is beyond EOD, truncated loop2: p252 start 1854537728 is beyond EOD, truncated loop2: p253 start 1854537728 is beyond EOD, truncated loop2: p254 start 1854537728 is beyond EOD, truncated loop2: p255 start 1854537728 is beyond EOD, truncated INFO: task init:19033 blocked for more than 140 seconds. Not tainted 4.9.202+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. init D28584 19033 1 0x00000000 0000000000000087 ffff8801a22caf80 0000000000000000 ffff8801db61ffc0 ffffffff83031180 ffff8801db61ffd8 ffff88019ff17758 ffffffff8280a1de ffff88010000000d 1ffff10033fe2ed4 00ffe8ffffc48520 ffff8801db6208b0 Call Trace: [<00000000c87ddd2e>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<0000000040624fe6>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579 [<000000003f285622>] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [<000000003f285622>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621 [<0000000095344fed>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] [<0000000095344fed>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 [<000000008d9838b1>] chrdev_open+0x230/0x630 fs/char_dev.c:398 [<00000000f4880f70>] do_dentry_open+0x422/0xd20 fs/open.c:791 [<00000000e09a44e7>] vfs_open+0x105/0x230 fs/open.c:904 [<0000000078a445f2>] do_last fs/namei.c:3457 [inline] [<0000000078a445f2>] path_openat+0xbf5/0x2f60 fs/namei.c:3581 [<000000009673568c>] do_filp_open+0x1a1/0x280 fs/namei.c:3615 [<00000000c89d7178>] do_sys_open+0x2f0/0x610 fs/open.c:1097 [<0000000083c21352>] SYSC_open fs/open.c:1115 [inline] [<0000000083c21352>] SyS_open+0x2d/0x40 fs/open.c:1110 [<00000000fac7499e>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<000000000f781aaf>] 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: [<0000000037b98098>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline] #0: (rcu_read_lock){......}, at: [<0000000037b98098>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263 #1: (tasklist_lock){.+.?..}, at: [<000000005860a016>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4339 1 lock held by rsyslogd/1899: #0: (&f->f_pos_lock){+.+.+.}, at: [<000000008b927a3d>] __fdget_pos+0xa8/0xd0 fs/file.c:782 2 locks held by getty/2026: #0: (&tty->ldisc_sem){++++++}, at: [<00000000291858a8>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376 #1: (&ldata->atomic_read_lock){+.+...}, at: [<00000000708fa3e3>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 1 lock held by init/19033: #0: (tty_mutex){+.+.+.}, at: [<0000000095344fed>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<0000000095344fed>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 1 lock held by init/19035: #0: (tty_mutex){+.+.+.}, at: [<0000000095344fed>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<0000000095344fed>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 1 lock held by init/19036: #0: (tty_mutex){+.+.+.}, at: [<0000000095344fed>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<0000000095344fed>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 1 lock held by init/19037: #0: (tty_mutex){+.+.+.}, at: [<0000000095344fed>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<0000000095344fed>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 1 lock held by init/19038: #0: (tty_mutex){+.+.+.}, at: [<0000000095344fed>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<0000000095344fed>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 1 lock held by syz-executor.1/31190: #0: (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<000000009f86c725>] lo_ioctl+0x8e/0x1b10 drivers/block/loop.c:1404 1 lock held by blkid/31240: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000f6ff8475>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 1 lock held by blkid/31253: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000f6ff8475>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 1 lock held by syz-executor.0/31258: #0: (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<000000009f86c725>] lo_ioctl+0x8e/0x1b10 drivers/block/loop.c:1404 1 lock held by blkid/31255: #0: (&bdev->bd_mutex){+.+.+.}, at: [<00000000f6ff8475>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 1 lock held by blkid/31257: #0: (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<000000009f86c725>] lo_ioctl+0x8e/0x1b10 drivers/block/loop.c:1404 1 lock held by blkid/31260: #0: (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<000000009f86c725>] lo_ioctl+0x8e/0x1b10 drivers/block/loop.c:1404 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.202+ #0 ffff8801d98d7cc8 ffffffff81b55d2b 0000000000000001 0000000000000000 0000000000000001 ffffffff8109a001 dffffc0000000000 ffff8801d98d7d00 ffffffff81b60fcc 0000000000000001 0000000000000000 0000000000000001 Call Trace: [<0000000027bc884a>] __dump_stack lib/dump_stack.c:15 [inline] [<0000000027bc884a>] dump_stack+0xcb/0x130 lib/dump_stack.c:56 [<000000005da3a224>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<00000000a30d36bf>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<000000006dd540e4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<000000004e112873>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<000000004e112873>] check_hung_task kernel/hung_task.c:126 [inline] [<000000004e112873>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline] [<000000004e112873>] watchdog+0x670/0xaf0 kernel/hung_task.c:263 [<00000000cb82d475>] kthread+0x278/0x310 kernel/kthread.c:211 [<0000000068480766>] 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: 19034 Comm: init Not tainted 4.9.202+ #0 task: 00000000b88c55a8 task.stack: 00000000a7499585 RIP: 0010:[] c [<00000000323f5520>] io_serial_in+0x6b/0x90 drivers/tty/serial/8250/8250_port.c:414 RSP: 0018:ffff8801acd97580 EFLAGS: 00000002 RAX: dffffc0000000000 RBX: 00000000000003fd RCX: 0000000000000000 RDX: 00000000000003fd RSI: ffffffff81d75981 RDI: ffffffff84b66d98 RBP: ffff8801acd97590 R08: 0000000000000001 R09: 000000000000541c R10: ffff8801a22ca0c0 R11: 0000000000000001 R12: ffffffff84b66d60 R13: 0000000000000020 R14: fffffbfff096cdf3 R15: fffffbfff096cdb5 FS: 00007f080454c7a0(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7761728169 CR3: 00000001c7872000 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Stack: ffffffff84b66d60c 000000000000270ac ffff8801acd975e0c ffffffff81d77c24c ffff8801acd97618c ffffffff84b66da8c ffffffff84b66f9ac ffffffff841d5633c ffffffff84b66d60c 000000000000006fc dffffc0000000000c 000000000000006fc Call Trace: [<000000002a0074fb>] serial_in drivers/tty/serial/8250/8250.h:111 [inline] [<000000002a0074fb>] wait_for_xmitr+0x94/0x1e0 drivers/tty/serial/8250/8250_port.c:1997 [<0000000024031c65>] serial8250_console_putchar+0x20/0x60 drivers/tty/serial/8250/8250_port.c:3103 [<000000005ff3d88b>] uart_console_write+0x56/0xe0 drivers/tty/serial/serial_core.c:1885 [<000000009d6f63f7>] serial8250_console_write+0x2fb/0x860 drivers/tty/serial/8250/8250_port.c:3169 [<0000000005e68ed6>] univ8250_console_write+0x5f/0x70 drivers/tty/serial/8250/8250_core.c:594 [<00000000b264a876>] call_console_drivers.isra.0.constprop.0+0x1ac/0x360 kernel/printk/printk.c:1546 [<00000000a068c0c9>] console_unlock+0x422/0xb40 kernel/printk/printk.c:2400 [<0000000022f537f1>] console_device+0x97/0xc0 kernel/printk/printk.c:2508 [<000000002f0312cf>] tty_lookup_driver drivers/tty/tty_io.c:2018 [inline] [<000000002f0312cf>] tty_open_by_driver drivers/tty/tty_io.c:2063 [inline] [<000000002f0312cf>] tty_open+0x796/0xe10 drivers/tty/tty_io.c:2140 [<000000008d9838b1>] chrdev_open+0x230/0x630 fs/char_dev.c:398 [<00000000f4880f70>] do_dentry_open+0x422/0xd20 fs/open.c:791 [<00000000e09a44e7>] vfs_open+0x105/0x230 fs/open.c:904 [<0000000078a445f2>] do_last fs/namei.c:3457 [inline] [<0000000078a445f2>] path_openat+0xbf5/0x2f60 fs/namei.c:3581 [<000000009673568c>] do_filp_open+0x1a1/0x280 fs/namei.c:3615 [<00000000c89d7178>] do_sys_open+0x2f0/0x610 fs/open.c:1097 [<0000000083c21352>] SYSC_open fs/open.c:1115 [inline] [<0000000083c21352>] SyS_open+0x2d/0x40 fs/open.c:1110 [<00000000fac7499e>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<000000000f781aaf>] 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 c78 c8c c78 cff ceb cc2 ce8 cd1 c8c c78 cff ceb c