INFO: task syz-executor6:9773 blocked for more than 140 seconds. Not tainted 4.18.0-rc5+ #156 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor6 D23352 9773 4524 0x00000004 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ed0 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_setxattr+0x96/0x100 fs/xattr.c:219 setxattr+0x2ea/0x450 fs/xattr.c:451 path_setxattr+0x1e3/0x230 fs/xattr.c:470 __do_sys_setxattr fs/xattr.c:485 [inline] __se_sys_setxattr fs/xattr.c:481 [inline] __x64_sys_setxattr+0xc4/0x150 fs/xattr.c:481 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455ab9 Code: e0 1f 48 89 04 24 e8 b6 6f fd ff e8 81 6a fd ff e8 5c 68 fd ff 48 8d 05 23 cd 48 00 48 89 04 24 48 c7 44 24 08 1d 00 00 00 e8 <13> 5e fd ff 0f 0b e8 8c 44 00 00 e9 07 f0 ff ff cc cc cc cc cc cc RSP: 002b:00007fbd4104dc68 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc RAX: ffffffffffffffda RBX: 00007fbd4104e6d4 RCX: 0000000000455ab9 RDX: 0000000020000340 RSI: 0000000020000380 RDI: 0000000020000140 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000ffdc R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004bbc29 R14: 00000000004d31b0 R15: 0000000000000000 INFO: task syz-executor6:9817 blocked for more than 140 seconds. Not tainted 4.18.0-rc5+ #156 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor6 D25032 9817 4524 0x00000004 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ed0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 request_wait_answer+0x4c8/0x920 fs/fuse/dev.c:463 __fuse_request_send+0x12a/0x1d0 fs/fuse/dev.c:483 fuse_request_send+0x62/0xa0 fs/fuse/dev.c:496 fuse_simple_request+0x33d/0x730 fs/fuse/dev.c:554 fuse_setxattr+0x3df/0x650 fs/fuse/xattr.c:37 fuse_xattr_set+0x3b/0x70 fs/fuse/xattr.c:192 __vfs_setxattr+0x124/0x190 fs/xattr.c:150 __vfs_setxattr_noperm+0x11d/0x410 fs/xattr.c:181 vfs_setxattr+0xd8/0x100 fs/xattr.c:224 setxattr+0x2ea/0x450 fs/xattr.c:451 path_setxattr+0x1e3/0x230 fs/xattr.c:470 __do_sys_setxattr fs/xattr.c:485 [inline] __se_sys_setxattr fs/xattr.c:481 [inline] __x64_sys_setxattr+0xc4/0x150 fs/xattr.c:481 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455ab9 Code: e0 1f 48 89 04 24 e8 b6 6f fd ff e8 81 6a fd ff e8 5c 68 fd ff 48 8d 05 23 cd 48 00 48 89 04 24 48 c7 44 24 08 1d 00 00 00 e8 <13> 5e fd ff 0f 0b e8 8c 44 00 00 e9 07 f0 ff ff cc cc cc cc cc cc RSP: 002b:00007fbd4102cc68 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc RAX: ffffffffffffffda RBX: 00007fbd4102d6d4 RCX: 0000000000455ab9 RDX: 0000000020000240 RSI: 0000000020000100 RDI: 0000000020000080 RBP: 000000000072bf48 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000002b R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004bbc29 R14: 00000000004d31b0 R15: 0000000000000001 INFO: task syz-executor6:9818 blocked for more than 140 seconds. Not tainted 4.18.0-rc5+ #156 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor6 D25408 9818 4524 0x00000004 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ed0 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_setxattr+0x96/0x100 fs/xattr.c:219 setxattr+0x2ea/0x450 fs/xattr.c:451 path_setxattr+0x1e3/0x230 fs/xattr.c:470 __do_sys_setxattr fs/xattr.c:485 [inline] __se_sys_setxattr fs/xattr.c:481 [inline] __x64_sys_setxattr+0xc4/0x150 fs/xattr.c:481 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455ab9 Code: e0 1f 48 89 04 24 e8 b6 6f fd ff e8 81 6a fd ff e8 5c 68 fd ff 48 8d 05 23 cd 48 00 48 89 04 24 48 c7 44 24 08 1d 00 00 00 e8 <13> 5e fd ff 0f 0b e8 8c 44 00 00 e9 07 f0 ff ff cc cc cc cc cc cc RSP: 002b:00007fbd4100bc68 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc RAX: ffffffffffffffda RBX: 00007fbd4100c6d4 RCX: 0000000000455ab9 RDX: 0000000020000240 RSI: 0000000020000100 RDI: 0000000020000080 RBP: 000000000072bff0 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000002b R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004bbc29 R14: 00000000004d31b0 R15: 0000000000000002 Showing all locks held in the system: 1 lock held by khungtaskd/901: #0: 000000004f58a692 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x428 kernel/locking/lockdep.c:4461 1 lock held by rsyslogd/4383: 2 locks held by getty/4474: #0: 00000000842f8965 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000ab6ea880 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4475: #0: 000000004b7bc428 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000752964ca (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4476: #0: 00000000df3fc4da (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 0000000008b1f162 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4477: #0: 00000000acfe6350 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000f83e2d84 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4478: #0: 00000000d15639e4 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 0000000090a13533 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4479: #0: 000000005184cdda (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000008fa1fedf (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4480: #0: 000000000453a86d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000005f759173 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by syz-executor6/9773: #0: 00000000b0f3a022 (sb_writers#13){.+.+}, at: sb_start_write include/linux/fs.h:1554 [inline] #0: 00000000b0f3a022 (sb_writers#13){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386 #1: 00000000d9bf8bd8 (&type->i_mutex_dir_key#5){+.+.}, at: inode_lock include/linux/fs.h:715 [inline] #1: 00000000d9bf8bd8 (&type->i_mutex_dir_key#5){+.+.}, at: vfs_setxattr+0x96/0x100 fs/xattr.c:219 2 locks held by syz-executor6/9817: #0: 00000000b0f3a022 (sb_writers#13){.+.+}, at: sb_start_write include/linux/fs.h:1554 [inline] #0: 00000000b0f3a022 (sb_writers#13){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386 #1: 00000000d9bf8bd8 (&type->i_mutex_dir_key#5){+.+.}, at: inode_lock include/linux/fs.h:715 [inline] #1: 00000000d9bf8bd8 (&type->i_mutex_dir_key#5){+.+.}, at: vfs_setxattr+0x96/0x100 fs/xattr.c:219 2 locks held by syz-executor6/9818: #0: 00000000b0f3a022 (sb_writers#13){.+.+}, at: sb_start_write include/linux/fs.h:1554 [inline] #0: 00000000b0f3a022 (sb_writers#13){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386 #1: 00000000d9bf8bd8 (&type->i_mutex_dir_key#5){+.+.}, at: inode_lock include/linux/fs.h:715 [inline] #1: 00000000d9bf8bd8 (&type->i_mutex_dir_key#5){+.+.}, at: vfs_setxattr+0x96/0x100 fs/xattr.c:219 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 901 Comm: khungtaskd Not tainted 4.18.0-rc5+ #156 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: 0 Comm: swapper/0 Not tainted 4.18.0-rc5+ #156 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:do_raw_spin_unlock+0x236/0x2f0 kernel/locking/spinlock_debug.c:136 Code: fc ff df 49 c7 44 05 00 00 00 00 00 48 8b 45 d0 65 48 33 04 25 28 00 00 00 0f 85 bb 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e <41> 5f 5d c3 e8 01 c2 fb 01 85 c0 0f 84 53 fe ff ff e9 23 0b 00 00 RSP: 0018:ffff8801dae078f8 EFLAGS: 00000086 RAX: 0000000000000000 RBX: 0000000000000086 RCX: ffffffff81601b87 RDX: 1ffffffff11e3631 RSI: 0000000000000004 RDI: ffffffff88fa12a0 RBP: ffff8801dae07900 R08: fffffbfff11f4255 R09: fffffbfff11f4254 R10: fffffbfff11f4254 R11: ffffffff88fa12a3 R12: ffffffff88fa12a0 R13: 001dcd6500000000 R14: 1ffff1003b5c0f41 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000195a000 CR3: 00000001b4c72000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:159 [inline] _raw_spin_unlock_irqrestore+0x27/0xc0 kernel/locking/spinlock.c:184 update_wall_time+0x88e/0xbd0 kernel/time/timekeeping.c:2102 tick_do_update_jiffies64.part.17+0x194/0x290 kernel/time/tick-sched.c:97 tick_do_update_jiffies64 kernel/time/tick-sched.c:66 [inline] tick_sched_do_timer+0x167/0x1a0 kernel/time/tick-sched.c:135 tick_sched_timer+0x2c/0x130 kernel/time/tick-sched.c:1267 __run_hrtimer kernel/time/hrtimer.c:1398 [inline] __hrtimer_run_queues+0x3eb/0x10c0 kernel/time/hrtimer.c:1460 hrtimer_interrupt+0x2f3/0x750 kernel/time/hrtimer.c:1518 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline] smp_apic_timer_interrupt+0x165/0x730 arch/x86/kernel/apic/apic.c:1050 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:863 RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54 Code: c7 48 89 45 d8 e8 aa 7a 27 fa 48 8b 45 d8 e9 d2 fe ff ff 48 89 df e8 99 7a 27 fa eb 8a 90 90 90 90 90 90 90 55 48 89 e5 fb f4 <5d> c3 0f 1f 84 00 00 00 00 00 55 48 89 e5 f4 5d c3 90 90 90 90 90 RSP: 0018:ffffffff88e07bc0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 1ffffffff11c0f7b RCX: 0000000000000000 RDX: 1ffffffff11e3618 RSI: 0000000000000001 RDI: ffffffff88f1b0c0 RBP: ffffffff88e07bc0 R08: ffffed003b5c46d7 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffffffff88e07c78 R14: ffffffff899ecb60 R15: 0000000000000000 arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline] default_idle+0xc7/0x450 arch/x86/kernel/process.c:500 arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:491 default_idle_call+0x6d/0x90 kernel/sched/idle.c:93 cpuidle_idle_call kernel/sched/idle.c:153 [inline] do_idle+0x3aa/0x570 kernel/sched/idle.c:262 cpu_startup_entry+0x10c/0x120 kernel/sched/idle.c:368 rest_init+0xe1/0xe4 init/main.c:442 start_kernel+0x90e/0x949 init/main.c:738 x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:452 x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:433 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:242