kworker/dying (28) used greatest stack depth: 15480 bytes left INFO: task khugepaged:1016 blocked for more than 140 seconds. Not tainted 4.13.0-rc1+ #1 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. khugepaged D23000 1016 2 0x00000000 Call Trace: context_switch kernel/sched/core.c:2771 [inline] __schedule+0x818/0x1fa0 kernel/sched/core.c:3332 schedule+0x109/0x440 kernel/sched/core.c:3391 rwsem_down_read_failed+0x3fe/0x650 kernel/locking/rwsem-xadd.c:261 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:65 [inline] down_read+0xa0/0x150 kernel/locking/rwsem.c:25 khugepaged_scan_mm_slot mm/khugepaged.c:1676 [inline] khugepaged_do_scan mm/khugepaged.c:1809 [inline] khugepaged+0x988/0x12f0 mm/khugepaged.c:1854 kthread+0x338/0x400 kernel/kthread.c:231 ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:425 Showing all locks held in the system: 2 locks held by khungtaskd/1009: #0: (rcu_read_lock){......}, at: [] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] #0: (rcu_read_lock){......}, at: [] watchdog+0x19d/0xba0 kernel/hung_task.c:249 #1: (tasklist_lock){.+.+..}, at: [] debug_show_all_locks+0xde/0x340 kernel/locking/lockdep.c:4417 1 lock held by khugepaged/1016: #0: (&mm->mmap_sem){++++++}, at: [] khugepaged_scan_mm_slot mm/khugepaged.c:1676 [inline] #0: (&mm->mmap_sem){++++++}, at: [] khugepaged_do_scan mm/khugepaged.c:1809 [inline] #0: (&mm->mmap_sem){++++++}, at: [] khugepaged+0x988/0x12f0 mm/khugepaged.c:1854 2 locks held by getty/6459: #0: (&tty->ldisc_sem){++++++}, at: [] ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+...}, at: [] n_tty_read+0x2e9/0x19d0 drivers/tty/n_tty.c:2133 2 locks held by getty/6460: #0: (&tty->ldisc_sem){++++++}, at: [] ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+...}, at: [] n_tty_read+0x2e9/0x19d0 drivers/tty/n_tty.c:2133 2 locks held by getty/6461: #0: (&tty->ldisc_sem){++++++}, at: [] ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+...}, at: [] n_tty_read+0x2e9/0x19d0 drivers/tty/n_tty.c:2133 2 locks held by getty/6462: #0: (&tty->ldisc_sem){++++++}, at: [] ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+...}, at: [] n_tty_read+0x2e9/0x19d0 drivers/tty/n_tty.c:2133 2 locks held by getty/6463: #0: (&tty->ldisc_sem){++++++}, at: [] ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+...}, at: [] n_tty_read+0x2e9/0x19d0 drivers/tty/n_tty.c:2133 2 locks held by getty/6464: #0: (&tty->ldisc_sem){++++++}, at: [] ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+...}, at: [] n_tty_read+0x2e9/0x19d0 drivers/tty/n_tty.c:2133 2 locks held by getty/6465: #0: (&tty->ldisc_sem){++++++}, at: [] ldsem_down_read+0x2d/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+...}, at: [] n_tty_read+0x2e9/0x19d0 drivers/tty/n_tty.c:2133 1 lock held by syz-executor.3/5978: #0: (&mm->mmap_sem){++++++}, at: [] exit_mm kernel/exit.c:510 [inline] #0: (&mm->mmap_sem){++++++}, at: [] do_exit+0x44a/0x17d0 kernel/exit.c:852 1 lock held by syz-executor.3/5981: #0: (&mm->mmap_sem){++++++}, at: [] exit_mm kernel/exit.c:510 [inline] #0: (&mm->mmap_sem){++++++}, at: [] do_exit+0x44a/0x17d0 kernel/exit.c:852 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1009 Comm: khungtaskd Not tainted 4.13.0-rc1+ #1 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x145/0x1e1 lib/dump_stack.c:52 nmi_cpu_backtrace.cold.5+0x13/0xb2 lib/nmi_backtrace.c:102 nmi_trigger_cpumask_backtrace+0xf4/0x118 lib/nmi_backtrace.c:61 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 trigger_all_cpu_backtrace include/linux/nmi.h:105 [inline] check_hung_task kernel/hung_task.c:132 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline] watchdog+0x74d/0xba0 kernel/hung_task.c:249 kthread+0x338/0x400 kernel/kthread.c:231 ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:425 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 5989 Comm: syz-executor.3 Not tainted 4.13.0-rc1+ #1 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88010defa2c0 task.stack: ffff880127190000 RIP: 0010:debug_lockdep_rcu_enabled+0x20/0x90 kernel/rcu/update.c:299 RSP: 0018:ffff880127197370 EFLAGS: 00000a07 RAX: dffffc0000000000 RBX: 1ffff10024e32e71 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 00000000000002eb RDI: ffffffff88bf7a74 RBP: ffff880127197370 R08: ffffffff817cdd5b R09: ffffffff89e98ec0 R10: ffff880127197860 R11: 0000000000000000 R12: ffffffff870ac9c0 R13: 0000000000000000 R14: ffffffff870ac9c0 R15: 00000000000002eb FS: 00007fe28fd0b700(0000) GS:ffff88012c000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff973c0f140 CR3: 0000000124726000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ___might_sleep+0x66/0x320 kernel/sched/core.c:5959 __might_sleep+0x93/0xb0 kernel/sched/core.c:5947 __mutex_lock_common kernel/locking/mutex.c:747 [inline] __mutex_lock+0x13d/0x18f0 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 perf_mmap+0x59b/0x1830 kernel/events/core.c:5307 call_mmap include/linux/fs.h:1747 [inline] mmap_region+0xa1e/0x16d0 mm/mmap.c:1689 do_mmap+0x534/0x1170 mm/mmap.c:1467 do_mmap_pgoff include/linux/mm.h:2107 [inline] vm_mmap_pgoff+0x1c3/0x2b0 mm/util.c:333 SYSC_mmap_pgoff mm/mmap.c:1517 [inline] SyS_mmap_pgoff+0x411/0x710 mm/mmap.c:1475 SYSC_mmap arch/x86/kernel/sys_x86_64.c:98 [inline] SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:89 entry_SYSCALL_64_fastpath+0x23/0xc2 RIP: 0033:0x458c29 RSP: 002b:00007fe28fd0ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000458c29 RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000020ffd000 RBP: 0000000000000082 R08: 0000000000000003 R09: 0000000000000000 R10: 0000000000001011 R11: 0000000000000246 R12: 00007fe28fd0b6d4 R13: 00000000004c4b5a R14: 00000000004d8780 R15: 00000000ffffffff Code: 00 66 2e 0f 1f 84 00 00 00 00 00 48 c7 c7 74 7a bf 88 55 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 89 e5 48 c1 ea 03 0f b6 14 02 <48> 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 4c 8b 15 7d 75