INFO: task syz-executor0:8627 blocked for more than 120 seconds. Not tainted 4.4.107-g610c835 #12 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D ffff8800b7ecf538 26872 8627 3520 0x00000004 ffff8800b7ecf538 ffffffff81ca514b 1ffff10016fd9ea2 0000000000000000 ffff8801d7f87038 ffff8800b9a00000 ffff8801db31f878 ffff8801db31f8a0 ffff8801db31ef98 ffff8801d32ddf00 ffff8800b7a94740 ffff8800b7ec8000 Call Trace: [] schedule+0x9a/0x1c0 kernel/sched/core.c:3351 [] schedule_timeout+0x3a1/0x970 kernel/time/timer.c:1508 [] io_schedule_timeout+0x1be/0x390 kernel/sched/core.c:4932 [] io_schedule include/linux/sched.h:447 [inline] [] bit_wait_io+0x1b/0xc0 kernel/sched/wait.c:595 [] __wait_on_bit+0x8c/0x140 kernel/sched/wait.c:395 [] wait_on_page_bit+0x1e5/0x210 mm/filemap.c:758 [] wait_on_page_locked include/linux/pagemap.h:521 [inline] [] __lock_page_or_retry+0x115/0x130 mm/filemap.c:928 [] lock_page_or_retry include/linux/pagemap.h:485 [inline] [] filemap_fault+0x35a/0xc00 mm/filemap.c:1984 [] __do_fault+0x11e/0x270 mm/memory.c:2775 [] do_read_fault mm/memory.c:2964 [inline] [] do_fault mm/memory.c:3129 [inline] [] handle_pte_fault mm/memory.c:3298 [inline] [] __handle_mm_fault mm/memory.c:3426 [inline] [] handle_mm_fault+0x17f9/0x3190 mm/memory.c:3455 [] faultin_page mm/gup.c:326 [inline] [] __get_user_pages+0x3c2/0xf70 mm/gup.c:519 [] populate_vma_page_range+0x198/0x230 mm/gup.c:924 [] __mm_populate+0x20c/0x360 mm/gup.c:974 [] mm_populate include/linux/mm.h:1924 [inline] [] vm_mmap_pgoff+0x1a2/0x1c0 mm/util.c:276 [] SYSC_mmap_pgoff mm/mmap.c:1491 [inline] [] SyS_mmap_pgoff+0x33f/0x560 mm/mmap.c:1449 [] SYSC_mmap arch/x86/kernel/sys_x86_64.c:95 [inline] [] SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:86 [] entry_SYSCALL_64_fastpath+0x16/0x76 no locks held by syz-executor0/8627. Sending NMI to all CPUs: NMI backtrace for cpu 0 CPU: 0 PID: 485 Comm: khungtaskd Not tainted 4.4.107-g610c835 #12 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8800bac017c0 task.stack: ffff8800bac10000 RIP: 0010:[] [] native_apic_mem_write arch/x86/include/asm/apic.h:94 [inline] RIP: 0010:[] [] __default_send_IPI_dest_field arch/x86/include/asm/ipi.h:119 [inline] RIP: 0010:[] [] _flat_send_IPI_mask arch/x86/kernel/apic/apic_flat_64.c:61 [inline] RIP: 0010:[] [] flat_send_IPI_mask+0xf7/0x1a0 arch/x86/kernel/apic/apic_flat_64.c:69 RSP: 0018:ffff8800bac17cb8 EFLAGS: 00000046 RAX: 0000000003000000 RBX: 0000000000000c00 RCX: 0000000000000000 RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fb300 RBP: ffff8800bac17ce0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000246 R13: 0000000000000003 R14: ffffffff8426abe0 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe0e29a5000 CR3: 00000001d34f5000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffffffff8426abe0 ffffffff847e8600 00000000000194a0 0000000000000040 dffffc0000000000 ffff8800bac17d00 ffffffff810b8e1b ffffffff839f53e0 0000000000000003 ffff8800bac17d60 ffffffff81d0f4d7 0000000000000000 Call Trace: [] nmi_raise_cpu_backtrace+0x5b/0x70 arch/x86/kernel/apic/hw_nmi.c:33 [] nmi_trigger_all_cpu_backtrace+0x4a7/0x550 lib/nmi_backtrace.c:85 [] arch_trigger_all_cpu_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 [] trigger_all_cpu_backtrace include/linux/nmi.h:44 [inline] [] check_hung_task kernel/hung_task.c:125 [inline] [] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline] [] watchdog+0x6fa/0xae0 kernel/hung_task.c:238 [] kthread+0x268/0x300 kernel/kthread.c:211 [] ret_from_fork+0x3f/0x70 arch/x86/entry/entry_64.S:468 Code: b3 5f ff f6 c4 10 75 e1 44 89 e8 c1 e0 18 89 04 25 10 b3 5f ff 44 89 fa 09 da 80 cf 04 41 83 ff 02 0f 44 d3 89 14 25 00 b3 5f ff <41> f7 c4 00 02 00 00 74 1a e8 3b 09 17 00 4c 89 e7 57 9d 0f 1f NMI backtrace for cpu 1 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.4.107-g610c835 #12 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801da2997c0 task.stack: ffff8801da2a8000 RIP: 0010:[] [] native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:49 RSP: 0018:ffff8801da2afd78 EFLAGS: 00000246 RAX: 0000000000000007 RBX: ffffffff847d6708 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8801da29a02c RBP: ffff8801da2afd78 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f01449c59b8 CR3: 00000001d34f5000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffff8801da2afdb0 ffffffff81027d75 ffff8801da2b0000 ffffffff847d6708 0000000000000000 0000000000000000 dffffc0000000000 ffff8801da2afdc0 ffffffff810292ea ffff8801da2afdd8 ffffffff8121e338 ffff8801da2b0000 Call Trace: [] arch_safe_halt arch/x86/include/asm/paravirt.h:117 [inline] [] default_idle+0x55/0x3c0 arch/x86/kernel/process.c:291 [] arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:282 [] default_idle_call+0x48/0x70 kernel/sched/idle.c:93 [] cpuidle_idle_call kernel/sched/idle.c:157 [inline] [] cpu_idle_loop kernel/sched/idle.c:253 [inline] [] cpu_startup_entry+0x605/0x820 kernel/sched/idle.c:301 [] start_secondary+0x304/0x3e0 arch/x86/kernel/smpboot.c:251 Code: 00 00 00 00 00 55 48 89 e5 fa 5d c3 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 fb 5d c3 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 fb f4 <5d> c3 0f 1f 84 00 00 00 00 00 55 48 89 e5 f4 5d c3 66 0f 1f 84