REISERFS warning (device loop1): super-6513 reiserfs_parse_options: quotafile must be on filesystem root. INFO: task syz-executor6:12941 blocked for more than 140 seconds. Not tainted 4.18.0-rc8+ #183 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor6 D25688 12941 4394 0x00000004 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ec0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 __rwsem_down_write_failed_common+0x95d/0x1630 kernel/locking/rwsem-xadd.c:566 rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:595 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0xaa/0x130 kernel/locking/rwsem.c:72 inode_lock include/linux/fs.h:715 [inline] vfs_removexattr+0x82/0x1c0 fs/xattr.c:391 removexattr+0xd3/0x130 fs/xattr.c:691 path_removexattr+0x1b9/0x210 fs/xattr.c:705 __do_sys_lremovexattr fs/xattr.c:725 [inline] __se_sys_lremovexattr fs/xattr.c:722 [inline] __x64_sys_lremovexattr+0x56/0x80 fs/xattr.c:722 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457089 Code: 08 e8 3b a9 fb ff 48 8b 44 24 20 48 8b 4c 24 18 48 8b 54 24 38 48 8b 7c 24 48 eb 8d 48 8b 6c 24 50 48 83 c4 58 c3 48 89 04 24 <48> 89 5c 24 08 e8 0d a9 fb ff 48 8b 44 24 40 48 8b 4c 24 48 48 8b RSP: 002b:00007f054f72ac78 EFLAGS: 00000246 ORIG_RAX: 00000000000000c6 RAX: ffffffffffffffda RBX: 00007f054f72b6d4 RCX: 0000000000457089 RDX: 0000000000000000 RSI: 0000000020000400 RDI: 00000000200002c0 RBP: 0000000000930320 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d2070 R14: 00000000004c7912 R15: 0000000000000004 Showing all locks held in the system: 1 lock held by khungtaskd/774: #0: 00000000b0fa1f18 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x428 kernel/locking/lockdep.c:4461 1 lock held by rsyslogd/4255: 2 locks held by getty/4345: #0: 0000000069b88740 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000e875caa1 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4346: #0: 0000000075583a1e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000e4e54890 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4347: #0: 0000000072155d1c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000000f596107 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4348: #0: 000000009fd564ba (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 0000000078f39d9b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4349: #0: 000000009c24af83 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000ddba9b12 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4350: #0: 00000000a1615a97 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000895c4d7d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4351: #0: 00000000983b127a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000f6851326 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by syz-executor6/12871: #0: 0000000069759e66 (sb_writers#13){.+.+}, at: sb_start_write include/linux/fs.h:1554 [inline] #0: 0000000069759e66 (sb_writers#13){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386 #1: 000000006ec45d4c (&sb->s_type->i_mutex_key#24){+.+.}, at: inode_lock include/linux/fs.h:715 [inline] #1: 000000006ec45d4c (&sb->s_type->i_mutex_key#24){+.+.}, at: vfs_removexattr+0x82/0x1c0 fs/xattr.c:391 2 locks held by syz-executor6/12941: #0: 0000000069759e66 (sb_writers#13){.+.+}, at: sb_start_write include/linux/fs.h:1554 [inline] #0: 0000000069759e66 (sb_writers#13){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386 #1: 000000006ec45d4c (&sb->s_type->i_mutex_key#24){+.+.}, at: inode_lock include/linux/fs.h:715 [inline] #1: 000000006ec45d4c (&sb->s_type->i_mutex_key#24){+.+.}, at: vfs_removexattr+0x82/0x1c0 fs/xattr.c:391 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 774 Comm: khungtaskd Not tainted 4.18.0-rc8+ #183 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+0x1c9/0x2b4 lib/dump_stack.c:113 nmi_cpu_backtrace.cold.4+0x19/0xce lib/nmi_backtrace.c:103 nmi_trigger_cpumask_backtrace+0x151/0x192 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:138 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:196 [inline] watchdog+0x9c4/0xf80 kernel/hung_task.c:252 kthread+0x345/0x410 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 2286 Comm: udevd Not tainted 4.18.0-rc8+ #183 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__fcheck_files include/linux/fdtable.h:88 [inline] RIP: 0010:__fget_light+0x23c/0x440 fs/file.c:736 Code: 8b 95 f0 fe ff ff 48 b8 00 00 00 00 00 fc ff df 4c 89 f9 48 c1 e9 03 48 8d 7a 08 c6 04 01 00 48 89 f9 48 c1 e9 03 80 3c 01 00 <0f> 85 ea 01 00 00 48 8b 42 08 4e 8d 2c e8 48 b8 00 00 00 00 00 fc RSP: 0018:ffff8801ca46fc78 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: 1ffff1003948df92 RCX: 1ffff100397caa8c RDX: ffff8801cbe55458 RSI: ffffffff81cc9940 RDI: ffff8801cbe55460 RBP: ffff8801ca46fd98 R08: ffff8801ca464600 R09: ffffed00397caa80 R10: ffffed00397caa80 R11: ffff8801cbe55403 R12: ffff8801ca46fd70 R13: 000000000000000a R14: dffffc0000000000 R15: ffff8801ca46fd30 FS: 00007fe1c5fba7a0(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000008a0000 CR3: 00000001caa41000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __fdget+0x18/0x20 fs/file.c:749 fdget include/linux/file.h:57 [inline] do_epoll_wait+0xe7/0x200 fs/eventpoll.c:2171 __do_sys_epoll_wait fs/eventpoll.c:2200 [inline] __se_sys_epoll_wait fs/eventpoll.c:2197 [inline] __x64_sys_epoll_wait+0x97/0xf0 fs/eventpoll.c:2197 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fe1c56ce943 Code: 00 31 d2 48 29 c2 64 89 11 48 83 c8 ff eb ea 90 90 90 90 90 90 90 90 83 3d b5 dc 2a 00 00 75 13 49 89 ca b8 e8 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 34 c3 48 83 ec 08 e8 3b c4 00 00 48 89 04 24 RSP: 002b:00007ffd940bc548 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8 RAX: ffffffffffffffda RBX: 0000000000000bb8 RCX: 00007fe1c56ce943 RDX: 0000000000000008 RSI: 00007ffd940bc640 RDI: 000000000000000a RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000bb8 R11: 0000000000000246 R12: 0000000000000003 R13: 0000000000000000 R14: 0000000002119d30 R15: 0000000002108250