INFO: task syz-executor.4:20254 can't die for more than 143 seconds. syz-executor.4 R running task 21088 20254 8635 0x00004006 Call Trace: fault_create_debugfs_attr+0x1e0/0x1e0 lib/fault-inject.c:244 Showing all locks held in the system: 1 lock held by khungtaskd/1044: #0: 0000000041714773 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5146 1 lock held by rsyslogd/8495: #0: 00000000cbe4c407 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801 2 locks held by getty/8585: #0: 000000004d635509 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000088f380b1 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8586: #0: 0000000014b6b860 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000006ca84706 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8587: #0: 00000000a193e208 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000000aa5c5b1 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8588: #0: 000000005192e585 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000529cfa00 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8589: #0: 0000000068d2b254 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000b3a6d717 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8590: #0: 000000005cd73bc2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000f3afb4c7 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 2 locks held by getty/8591: #0: 0000000061c559d5 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000a7f34b0e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.4/20254: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1044 Comm: khungtaskd Not tainted 5.2.0-rc3-next-20190605 #9 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1be/0x236 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:249 [inline] watchdog+0xb88/0x12b0 kernel/hung_task.c:333 kthread+0x354/0x420 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 8493 Comm: rs:main Q:Reg Not tainted 5.2.0-rc3-next-20190605 #9 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:mark_lock+0xbb/0x1370 kernel/locking/lockdep.c:3485 Code: 8a 48 8d 7b 50 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 92 0e 00 00 4c 85 6b 50 0f 84 c1 00 00 00 <41> bd 01 00 00 00 48 83 c4 20 44 89 e8 5b 41 5c 41 5d 41 5e 41 5f RSP: 0018:ffff888086547318 EFLAGS: 00000002 RAX: dffffc0000000000 RBX: ffffffff8a523530 RCX: 1ffff1101162a574 RDX: 1ffffffff14a46b0 RSI: ffff88808b152b80 RDI: ffffffff8a523580 RBP: ffff888086547360 R08: 00000000000003fa R09: ffff88808b152ba0 R10: ffff88808b152b80 R11: ffff88808b152280 R12: ffff88808b152b80 R13: 0000000000000008 R14: 0000000000000003 R15: ffff88808b152280 FS: 00007fd35bb59700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000422d10 CR3: 00000000a4809000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: mark_irqflags kernel/locking/lockdep.c:3394 [inline] __lock_acquire+0x4c7/0x5490 kernel/locking/lockdep.c:3742 lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:4300 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x32/0x50 kernel/locking/spinlock.c:223 ext4_es_lookup_extent+0x8a/0xb90 fs/ext4/extents_status.c:914 ext4_da_map_blocks fs/ext4/inode.c:1865 [inline] ext4_da_get_block_prep+0x26b/0x10c0 fs/ext4/inode.c:1986 ext4_block_write_begin+0x589/0x1280 fs/ext4/inode.c:1196 ext4_da_write_begin+0x511/0xec0 fs/ext4/inode.c:3116 generic_perform_write+0x22a/0x520 mm/filemap.c:3207 __generic_file_write_iter+0x25e/0x630 mm/filemap.c:3336 ext4_file_write_iter+0x332/0x1070 fs/ext4/file.c:266 call_write_iter include/linux/fs.h:1870 [inline] new_sync_write+0x4d3/0x770 fs/read_write.c:483 __vfs_write+0xe1/0x110 fs/read_write.c:496 vfs_write+0x268/0x5d0 fs/read_write.c:558 ksys_write+0x14f/0x290 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write fs/read_write.c:620 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:620 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fd35d5b719d Code: d1 20 00 00 75 10 b8 01 00 00 00 0f 05 48 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 be fa ff ff 48 89 04 24 b8 01 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 07 fb ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007fd35bb58000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000000018f RCX: 00007fd35d5b719d RDX: 000000000000018f RSI: 0000000000f91ce0 RDI: 0000000000000007 RBP: 0000000000f91ce0 R08: 0000000000f91e5f R09: 00007fd35cf34a87 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 00007fd35bb58480 R14: 000000000000000f R15: 0000000000f91ae0