[17294] 0 17294 17585 8216 26 4 0 1000 syz-executor3 [17295] 0 17295 17585 9095 25 5 0 1000 syz-executor2 Out of memory: Kill process 17260 (syz-executor1) score 1010 or sacrifice child Killed process 17260 (syz-executor1) total-vm:70604kB, anon-rss:18188kB, file-rss:52264kB, shmem-rss:0kB oom_reaper: reaped process 17260 (syz-executor1), now anon-rss:18196kB, file-rss:19488kB, shmem-rss:0kB INFO: task init:14541 blocked for more than 140 seconds. Not tainted 4.14.88+ #23 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. init D29352 14541 1 0x00000000 Call Trace: schedule+0x7f/0x1b0 kernel/sched/core.c:3490 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893 tty_open_by_driver drivers/tty/tty_io.c:1927 [inline] tty_open+0x3a8/0x980 drivers/tty/tty_io.c:2011 chrdev_open+0x20d/0x570 fs/char_dev.c:417 do_dentry_open+0x426/0xda0 fs/open.c:764 vfs_open+0x11c/0x210 fs/open.c:878 do_last fs/namei.c:3455 [inline] path_openat+0x5f9/0x2930 fs/namei.c:3597 do_filp_open+0x197/0x270 fs/namei.c:3631 do_sys_open+0x2ef/0x580 fs/open.c:1071 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x7f8bb343b120 RSP: 002b:00007ffef43f28c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000be6010 RCX: 00007f8bb343b120 RDX: 0000000000000010 RSI: 0000000000000902 RDI: 00000000004072c8 RBP: 0000000000000000 R08: 0000000000407370 R09: 0000000000000001 R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000902 R13: 0000000000000102 R14: 00007ffef43f2a40 R15: 0000000000be6018 INFO: task init:14542 blocked for more than 140 seconds. Not tainted 4.14.88+ #23 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. init D29352 14542 1 0x00000000 Call Trace: schedule+0x7f/0x1b0 kernel/sched/core.c:3490 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893 tty_open_by_driver drivers/tty/tty_io.c:1927 [inline] tty_open+0x3a8/0x980 drivers/tty/tty_io.c:2011 chrdev_open+0x20d/0x570 fs/char_dev.c:417 do_dentry_open+0x426/0xda0 fs/open.c:764 vfs_open+0x11c/0x210 fs/open.c:878 do_last fs/namei.c:3455 [inline] path_openat+0x5f9/0x2930 fs/namei.c:3597 do_filp_open+0x197/0x270 fs/namei.c:3631 do_sys_open+0x2ef/0x580 fs/open.c:1071 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x7f8bb343b120 RSP: 002b:00007ffef43f28c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000be60e0 RCX: 00007f8bb343b120 RDX: 0000000000000010 RSI: 0000000000000902 RDI: 00000000004072c8 RBP: 0000000000000000 R08: 0000000000407370 R09: 0000000000000001 R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000902 R13: 0000000000000102 R14: 00007ffef43f2a40 R15: 0000000000be60e8 INFO: task init:14543 blocked for more than 140 seconds. Not tainted 4.14.88+ #23 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. init D29352 14543 1 0x00000000 Call Trace: schedule+0x7f/0x1b0 kernel/sched/core.c:3490 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893 tty_open_by_driver drivers/tty/tty_io.c:1927 [inline] tty_open+0x3a8/0x980 drivers/tty/tty_io.c:2011 chrdev_open+0x20d/0x570 fs/char_dev.c:417 do_dentry_open+0x426/0xda0 fs/open.c:764 vfs_open+0x11c/0x210 fs/open.c:878 do_last fs/namei.c:3455 [inline] path_openat+0x5f9/0x2930 fs/namei.c:3597 do_filp_open+0x197/0x270 fs/namei.c:3631 do_sys_open+0x2ef/0x580 fs/open.c:1071 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x7f8bb343b120 RSP: 002b:00007ffef43f28c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000be61b0 RCX: 00007f8bb343b120 RDX: 0000000000000010 RSI: 0000000000000902 RDI: 00000000004072c8 RBP: 0000000000000000 R08: 0000000000407370 R09: 0000000000000001 R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000902 R13: 0000000000000102 R14: 00007ffef43f2a40 R15: 0000000000be61b8 INFO: task init:14545 blocked for more than 140 seconds. Not tainted 4.14.88+ #23 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. init D29352 14545 1 0x00000000 Call Trace: schedule+0x7f/0x1b0 kernel/sched/core.c:3490 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893 tty_open_by_driver drivers/tty/tty_io.c:1927 [inline] tty_open+0x3a8/0x980 drivers/tty/tty_io.c:2011 chrdev_open+0x20d/0x570 fs/char_dev.c:417 do_dentry_open+0x426/0xda0 fs/open.c:764 vfs_open+0x11c/0x210 fs/open.c:878 do_last fs/namei.c:3455 [inline] path_openat+0x5f9/0x2930 fs/namei.c:3597 do_filp_open+0x197/0x270 fs/namei.c:3631 do_sys_open+0x2ef/0x580 fs/open.c:1071 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x7f8bb343b120 RSP: 002b:00007ffef43f28c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000be6280 RCX: 00007f8bb343b120 RDX: 0000000000000010 RSI: 0000000000000902 RDI: 00000000004072c8 RBP: 0000000000000000 R08: 0000000000407370 R09: 0000000000000001 R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000902 R13: 0000000000000102 R14: 00007ffef43f2a40 R15: 0000000000be6288 INFO: task init:14546 blocked for more than 140 seconds. Not tainted 4.14.88+ #23 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. init D29352 14546 1 0x00000000 Call Trace: schedule+0x7f/0x1b0 kernel/sched/core.c:3490 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3548 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x521/0x1480 kernel/locking/mutex.c:893 tty_open_by_driver drivers/tty/tty_io.c:1927 [inline] tty_open+0x3a8/0x980 drivers/tty/tty_io.c:2011 chrdev_open+0x20d/0x570 fs/char_dev.c:417 do_dentry_open+0x426/0xda0 fs/open.c:764 vfs_open+0x11c/0x210 fs/open.c:878 do_last fs/namei.c:3455 [inline] path_openat+0x5f9/0x2930 fs/namei.c:3597 do_filp_open+0x197/0x270 fs/namei.c:3631 do_sys_open+0x2ef/0x580 fs/open.c:1071 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x7f8bb343b120 RSP: 002b:00007ffef43f28c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000be6350 RCX: 00007f8bb343b120 RDX: 0000000000000010 RSI: 0000000000000902 RDI: 00000000004072c8 RBP: 0000000000000000 R08: 0000000000407370 R09: 0000000000000001 R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000902 R13: 0000000000000102 R14: 00007ffef43f2a40 R15: 0000000000be6358 Showing all locks held in the system: 1 lock held by khungtaskd/23: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x74/0x20f kernel/locking/lockdep.c:4541 1 lock held by rsyslogd/1638: #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0xa2/0xc0 fs/file.c:768 2 locks held by getty/1766: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x20/0x80 drivers/tty/tty_ldisc.c:275 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1ff/0x1700 drivers/tty/n_tty.c:2156 1 lock held by sshd/1782: #0: (&ei->i_mmap_sem){++++}, at: [] ext4_filemap_fault+0x75/0xb0 fs/ext4/inode.c:6178 2 locks held by syz-fuzzer/1789: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x26d/0xb60 arch/x86/mm/fault.c:1354 #1: (&ei->i_mmap_sem){++++}, at: [] ext4_filemap_fault+0x75/0xb0 fs/ext4/inode.c:6178 2 locks held by syz-fuzzer/1790: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x26d/0xb60 arch/x86/mm/fault.c:1354 #1: (&ei->i_mmap_sem){++++}, at: [] ext4_filemap_fault+0x75/0xb0 fs/ext4/inode.c:6178 2 locks held by syz-executor3/4521: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x20/0x80 drivers/tty/tty_ldisc.c:275 #1: (&tty->atomic_write_lock){+.+.}, at: [] tty_write_lock+0x1b/0x60 drivers/tty/tty_io.c:883 2 locks held by syz-executor3/4536: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x20/0x80 drivers/tty/tty_ldisc.c:275 #1: (&tty->atomic_write_lock){+.+.}, at: [] tty_write_lock+0x1b/0x60 drivers/tty/tty_io.c:883 2 locks held by syz-executor3/4567: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x20/0x80 drivers/tty/tty_ldisc.c:275 #1: (&tty->atomic_write_lock){+.+.}, at: [] tty_write_lock+0x1b/0x60 drivers/tty/tty_io.c:883 1 lock held by init/14541: #0: (tty_mutex){+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:1927 [inline] #0: (tty_mutex){+.+.}, at: [] tty_open+0x3a8/0x980 drivers/tty/tty_io.c:2011 1 lock held by init/14542: #0: (tty_mutex){+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:1927 [inline] #0: (tty_mutex){+.+.}, at: [] tty_open+0x3a8/0x980 drivers/tty/tty_io.c:2011 1 lock held by init/14543: #0: (tty_mutex){+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:1927 [inline] #0: (tty_mutex){+.+.}, at: [] tty_open+0x3a8/0x980 drivers/tty/tty_io.c:2011 1 lock held by init/14545: #0: (tty_mutex){+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:1927 [inline] #0: (tty_mutex){+.+.}, at: [] tty_open+0x3a8/0x980 drivers/tty/tty_io.c:2011 1 lock held by init/14546: #0: (tty_mutex){+.+.}, at: [] tty_open_by_driver drivers/tty/tty_io.c:1927 [inline] #0: (tty_mutex){+.+.}, at: [] tty_open+0x3a8/0x980 drivers/tty/tty_io.c:2011 1 lock held by syz-executor5/17286: #0: (&mm->mmap_sem){++++}, at: [] vm_mmap_pgoff+0x14f/0x1d0 mm/util.c:331 1 lock held by syz-executor5/17287: #0: (&mm->mmap_sem){++++}, at: [] __mm_populate+0x206/0x300 mm/gup.c:1247 1 lock held by syz-executor3/17294: #0: (&mm->mmap_sem){++++}, at: [] vm_mmap_pgoff+0x14f/0x1d0 mm/util.c:331 2 locks held by syz-executor3/17297: #0: (&mm->mmap_sem){++++}, at: [] __mm_populate+0x206/0x300 mm/gup.c:1247 #1: (pcpu_drain_mutex){+.+.}, at: [] drain_all_pages+0x4a/0x550 mm/page_alloc.c:2505 1 lock held by syz-executor2/17295: #0: (&mm->mmap_sem){++++}, at: [] vm_mmap_pgoff+0x14f/0x1d0 mm/util.c:331 2 locks held by syz-executor2/17300: #0: (&dup_mmap_sem){.+.+}, at: [] dup_mmap kernel/fork.c:609 [inline] #0: (&dup_mmap_sem){.+.+}, at: [] dup_mm kernel/fork.c:1202 [inline] #0: (&dup_mmap_sem){.+.+}, at: [] copy_mm kernel/fork.c:1256 [inline] #0: (&dup_mmap_sem){.+.+}, at: [] copy_process.part.6+0x3989/0x6530 kernel/fork.c:1762 #1: (&mm->mmap_sem){++++}, at: [] dup_mmap kernel/fork.c:610 [inline] #1: (&mm->mmap_sem){++++}, at: [] dup_mm kernel/fork.c:1202 [inline] #1: (&mm->mmap_sem){++++}, at: [] copy_mm kernel/fork.c:1256 [inline] #1: (&mm->mmap_sem){++++}, at: [] copy_process.part.6+0x39a5/0x6530 kernel/fork.c:1762 2 locks held by udevd/17301: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x26d/0xb60 arch/x86/mm/fault.c:1354 #1: (&ei->i_mmap_sem){++++}, at: [] ext4_filemap_fault+0x75/0xb0 fs/ext4/inode.c:6178 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 23 Comm: khungtaskd Not tainted 4.14.88+ #23 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x11b lib/dump_stack.c:53 nmi_cpu_backtrace.cold.0+0x47/0x85 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x121/0x146 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:196 [inline] watchdog+0x574/0xa70 kernel/hung_task.c:252 kthread+0x348/0x420 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at pc 0xffffffffa2869702