INFO: task syz-executor6:12686 blocked for more than 140 seconds. Not tainted 4.18.0-rc8-next-20180806+ #32 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor6 D23648 12686 12364 0x00000004 Call Trace: context_switch kernel/sched/core.c:2823 [inline] __schedule+0x87c/0x1ec0 kernel/sched/core.c:3471 schedule+0xfb/0x450 kernel/sched/core.c:3515 __rwsem_down_write_failed_common+0x98b/0x1650 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:765 [inline] vfs_setxattr+0x96/0x100 fs/xattr.c:218 setxattr+0x2ea/0x450 fs/xattr.c:450 path_setxattr+0x1e3/0x230 fs/xattr.c:469 __do_sys_setxattr fs/xattr.c:484 [inline] __se_sys_setxattr fs/xattr.c:480 [inline] __x64_sys_setxattr+0xc4/0x150 fs/xattr.c:480 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x456cb9 Code: 18 85 c0 75 12 48 8b 44 24 20 48 89 08 48 8b 6c 24 28 48 83 c4 30 c3 48 8b 44 24 20 48 89 04 24 48 89 4c 24 08 e8 e7 ac fb ff e1 e8 f0 31 00 00 e9 7b ff ff ff cc cc cc cc cc cc cc cc cc cc RSP: 002b:00007f04b2ac3c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc RAX: ffffffffffffffda RBX: 00007f04b2ac46d4 RCX: 0000000000456cb9 RDX: 0000000020000400 RSI: 0000000020000380 RDI: 0000000020000140 RBP: 00000000009301e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d51f0 R14: 00000000004c2ff4 R15: 0000000000000002 INFO: lockdep is turned off. NMI backtrace for cpu 0 CPU: 0 PID: 775 Comm: khungtaskd Not tainted 4.18.0-rc8-next-20180806+ #32 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.3+0x48/0x88 lib/nmi_backtrace.c:101 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:144 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:204 [inline] watchdog+0xb39/0x10b0 kernel/hung_task.c:265 kthread+0x35a/0x420 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.18.0-rc8-next-20180806+ #32 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:trace_hardirqs_on_caller+0x0/0x5c0 kernel/locking/lockdep.c:2799 Code: ff ff 48 8b 7d c0 4c 89 45 c8 44 89 4d d0 e8 f7 ba 5c 00 4c 8b 45 c8 44 8b 4d d0 eb 91 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 <48> b8 00 00 00 00 00 fc ff df 55 48 89 e5 41 54 49 89 fc 48 c7 c7 RSP: 0018:ffff8801db107c80 EFLAGS: 00000082 RAX: 000000000002c080 RBX: ffff8801d9f18380 RCX: ffffffff816b80c4 RDX: 0000000000000000 RSI: 0000000080000001 RDI: ffffffff86e00275 RBP: ffff8801db107c88 R08: ffff8801d9f18380 R09: 0000000000000000 R10: fffffbfff11a3609 R11: 0000000000000000 R12: 1ffff1003b620fe0 R13: ffff8801db107fc0 R14: 0000000000000000 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000001c09c7000 CR4: 00000000001406e0 Call Trace: __do_softirq+0x275/0xb17 kernel/softirq.c:276 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x1d4/0x210 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:527 [inline] smp_apic_timer_interrupt+0x186/0x730 arch/x86/kernel/apic/apic.c:1055 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:867 RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54 Code: c7 48 89 45 d8 e8 0a c4 02 fb 48 8b 45 d8 e9 d2 fe ff ff 48 89 df e8 f9 c3 02 fb 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:ffff8801d9f27c38 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 1ffff1003b3e4f8a RCX: ffffffff81674282 RDX: 1ffffffff0fe3670 RSI: 0000000000000004 RDI: ffffffff87f1b380 RBP: ffff8801d9f27c38 R08: ffffed003b6246d7 R09: ffffed003b6246d6 R10: ffffed003b6246d6 R11: ffff8801db1236b3 R12: 0000000000000001 R13: ffff8801d9f27cf0 R14: ffffffff888aeda0 R15: 0000000000000000 arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline] default_idle+0xc7/0x450 arch/x86/kernel/process.c:498 arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:489 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 start_secondary+0x433/0x5d0 arch/x86/kernel/smpboot.c:270 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:242