loop1: p252 start 1854537728 is beyond EOD, truncated loop1: p253 start 1854537728 is beyond EOD, truncated loop1: p254 start 1854537728 is beyond EOD, truncated loop1: p255 start 1854537728 is beyond EOD, truncated INFO: task init:30274 blocked for more than 140 seconds. Not tainted 4.9.203-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. init D27368 30274 1 0x00000000 0000000000000087 ffff88019dfa8000 ffff8801a4569600 ffff8801db71ffc0 ffff8801a54faf80 ffff8801db71ffd8 ffff88019e77f758 ffffffff8280a79e ffff88010000000d 1ffff10033cefed4 00ffe8ffffd11248 ffff8801db7208b0 Call Trace: [<0000000055367e33>] schedule+0x92/0x1c0 kernel/sched/core.c:3546 [<00000000d2bd3cc4>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579 [<000000004139b3a9>] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [<000000004139b3a9>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621 [<0000000037427415>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] [<0000000037427415>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 [<00000000dc5ddc13>] chrdev_open+0x230/0x630 fs/char_dev.c:398 [<00000000bd6f7029>] do_dentry_open+0x422/0xd20 fs/open.c:791 [<00000000053da3f7>] vfs_open+0x105/0x230 fs/open.c:904 [<0000000099182a3e>] do_last fs/namei.c:3457 [inline] [<0000000099182a3e>] path_openat+0xbf5/0x2f60 fs/namei.c:3581 [<000000002c78d2c1>] do_filp_open+0x1a1/0x280 fs/namei.c:3615 [<000000008ca7e4a9>] do_sys_open+0x2f0/0x610 fs/open.c:1097 [<0000000096275fa3>] SYSC_open fs/open.c:1115 [inline] [<0000000096275fa3>] SyS_open+0x2d/0x40 fs/open.c:1110 [<000000007fb528c1>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<00000000407669a7>] 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: [<000000008dd1c2a2>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline] #0: (rcu_read_lock){......}, at: [<000000008dd1c2a2>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263 #1: (tasklist_lock){.+.+..}, at: [<00000000b40ff8db>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4339 1 lock held by rsyslogd/1910: #0: (&f->f_pos_lock){+.+.+.}, at: [<000000003a302415>] __fdget_pos+0xa8/0xd0 fs/file.c:782 2 locks held by getty/2038: #0: (&tty->ldisc_sem){++++++}, at: [<000000001cdb49bc>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:376 #1: (&ldata->atomic_read_lock){+.+...}, at: [<00000000f99ad340>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156 1 lock held by init/30274: #0: (tty_mutex){+.+.+.}, at: [<0000000037427415>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<0000000037427415>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 1 lock held by init/30275: #0: (tty_mutex){+.+.+.}, at: [<0000000037427415>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<0000000037427415>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 1 lock held by init/30276: #0: (tty_mutex){+.+.+.}, at: [<0000000037427415>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<0000000037427415>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 1 lock held by init/30278: #0: (tty_mutex){+.+.+.}, at: [<0000000037427415>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<0000000037427415>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 1 lock held by init/30279: #0: (tty_mutex){+.+.+.}, at: [<0000000037427415>] tty_open_by_driver drivers/tty/tty_io.c:2062 [inline] #0: (tty_mutex){+.+.+.}, at: [<0000000037427415>] tty_open+0x3f9/0xe10 drivers/tty/tty_io.c:2140 1 lock held by blkid/13959: #0: (&bdev->bd_mutex){+.+.+.}, at: [<000000004f4f5327>] __blkdev_get+0x10e/0xeb0 fs/block_dev.c:1273 1 lock held by blkid/13983: #0: (&bdev->bd_mutex){+.+.+.}, at: [<0000000027f4a537>] blkdev_put+0x2b/0x560 fs/block_dev.c:1629 2 locks held by syz-executor.5/13986: #0: (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<00000000d63ef4d9>] lo_ioctl+0x8e/0x1b10 drivers/block/loop.c:1404 #1: (uevent_sock_mutex){+.+.+.}, at: [<00000000b046af3e>] kobject_uevent_env+0x451/0xba0 lib/kobject_uevent.c:280 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 24 Comm: khungtaskd Not tainted 4.9.203-syzkaller #0 ffff8801d98d7cc8 ffffffff81b55f6b 0000000000000000 0000000000000000 0000000000000000 ffffffff8109a001 dffffc0000000000 ffff8801d98d7d00 ffffffff81b6120c 0000000000000000 0000000000000000 0000000000000000 Call Trace: [<0000000007d904d6>] __dump_stack lib/dump_stack.c:15 [inline] [<0000000007d904d6>] dump_stack+0xcb/0x130 lib/dump_stack.c:56 [<0000000007c8376e>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99 [<00000000f8135501>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60 [<00000000fa2aaf55>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [<00000000b6b68b1f>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [<00000000b6b68b1f>] check_hung_task kernel/hung_task.c:126 [inline] [<00000000b6b68b1f>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline] [<00000000b6b68b1f>] watchdog+0x670/0xaf0 kernel/hung_task.c:263 [<00000000905139bb>] kthread+0x278/0x310 kernel/kthread.c:211 [<00000000d80bab2a>] 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: 13995 Comm: blkid Not tainted 4.9.203-syzkaller #0 task: 00000000f755d93d task.stack: 0000000007b218c1 RIP: 0010:[] c [<000000003c06d2b2>] lock_acquire+0x13/0x3d0 kernel/locking/lockdep.c:3748 RSP: 0018:ffff8801a1e87bb8 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8801d401ee80 RBP: ffff8801a1e87bc0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: ffff8801d401ee68 R13: 00007f3a51801000 R14: ffff8801a20e3960 R15: ffff8801d401ee68 FS: 0000000000000000(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f830cda0000 CR3: 00000001d7def000 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffff8801d401ee68c ffff8801a1e87be0c ffffffff8281a0d8c ffffffff814b4b3ec ffff8801a20e3980c ffff8801a1e87c50c ffffffff814b4b3ec 0000000000000000c ffff8801d401ee60c ffff8801d401ee00c ffff88010000000ac ffff8801a20e3960c Call Trace: [<00000000373ce035>] __raw_spin_lock include/linux/spinlock_api_smp.h:144 [inline] [<00000000373ce035>] _raw_spin_lock+0x38/0x50 kernel/locking/spinlock.c:151 [<00000000e9136fd9>] spin_lock include/linux/spinlock.h:302 [inline] [<00000000e9136fd9>] browse_rb mm/mmap.c:313 [inline] [<00000000e9136fd9>] validate_mm+0x2fe/0x5a0 mm/mmap.c:380 [<00000000737679d7>] remove_vma_list mm/mmap.c:2522 [inline] [<00000000737679d7>] do_munmap+0x702/0xd00 mm/mmap.c:2744 [<0000000015fa9204>] mmap_region+0x167/0xfa0 mm/mmap.c:1667 [<00000000e018474f>] do_mmap+0x539/0xbc0 mm/mmap.c:1505 [<000000003f17c96f>] do_mmap_pgoff include/linux/mm.h:2066 [inline] [<000000003f17c96f>] vm_mmap_pgoff+0x179/0x1c0 mm/util.c:329 [<00000000d788b537>] SYSC_mmap_pgoff mm/mmap.c:1555 [inline] [<00000000d788b537>] SyS_mmap_pgoff+0x14d/0x1b0 mm/mmap.c:1513 [<00000000708b51b6>] SYSC_mmap arch/x86/kernel/sys_x86_64.c:96 [inline] [<00000000708b51b6>] SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:87 [<000000007fb528c1>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<00000000407669a7>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Code: c2e c00 ce9 c59 cfe cff cff c48 cc7 cc7 c40 cff c24 c84 ce8 c45 cc5 c2e c00 ce9 c78 cf9 cff cff c48 cb8 c00 c00 c00 c00 c00 cfc cff cdf c55 c45 c89 cc2 c48 c89 ce5 c41 c57 c<41> c89 ccf c41 c56 c41 c89 cd6 c41 c55 c41 c89 cf5 c41 c54 c49 c89 cfc c53 c65 c48 c