NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 INFO: task syz-executor.2:21656 blocked for more than 140 seconds. Not tainted 4.14.177-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D27552 21656 6374 0x00000004 Call Trace: schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_timeout+0x946/0xe40 kernel/time/timer.c:1723 do_wait_for_common kernel/sched/completion.c:91 [inline] __wait_for_common kernel/sched/completion.c:112 [inline] wait_for_common kernel/sched/completion.c:123 [inline] wait_for_completion+0x241/0x390 kernel/sched/completion.c:144 flush_work+0x3f5/0x780 kernel/workqueue.c:2893 drain_all_pages+0x39a/0x570 mm/page_alloc.c:2536 __alloc_pages_direct_reclaim mm/page_alloc.c:3616 [inline] __alloc_pages_slowpath+0xa16/0x26c0 mm/page_alloc.c:3989 __alloc_pages_nodemask+0x5d3/0x700 mm/page_alloc.c:4198 alloc_pages_vma+0xc2/0x4a0 mm/mempolicy.c:2077 alloc_zeroed_user_highpage_movable include/linux/highmem.h:184 [inline] do_anonymous_page mm/memory.c:3133 [inline] handle_pte_fault mm/memory.c:3987 [inline] __handle_mm_fault+0x17b6/0x3280 mm/memory.c:4113 handle_mm_fault+0x288/0x7a0 mm/memory.c:4150 __do_page_fault+0x4bc/0xb40 arch/x86/mm/fault.c:1442 page_fault+0x45/0x50 arch/x86/entry/entry_64.S:1122 RIP: 165de2ff:0x7f14a72b79c0 RSP: a72b7700:00007fff165de470 EFLAGS: 00000000 Showing all locks held in the system: 1 lock held by khungtaskd/1058: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 1 lock held by in:imklog/6050: #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0xa6/0xc0 fs/file.c:769 2 locks held by syz-executor.2/21656: #0: (&mm->mmap_sem){++++}, at: [] __do_page_fault+0x2cd/0xb40 arch/x86/mm/fault.c:1371 #1: (pcpu_drain_mutex){+.+.}, at: [] drain_all_pages+0x4a/0x570 mm/page_alloc.c:2493 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1058 Comm: khungtaskd Not tainted 4.14.177-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x13e/0x194 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x139/0x17e lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x5e2/0xb80 kernel/hung_task.c:274 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 11906 Comm: syz-executor.3 Not tainted 4.14.177-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88809f04e440 task.stack: ffff88820b800000 RIP: 0010:unwind_next_frame+0xeb9/0x17a0 arch/x86/kernel/unwind_orc.c:474 RSP: 0000:ffff88820b807798 EFLAGS: 00000807 RAX: ffffffff88e8a1b5 RBX: ffff88820b8078e0 RCX: 0000000000000000 RDX: ffff88820b807920 RSI: 0000000000000000 RDI: ffffffff88e8a1b4 RBP: 1ffff11041700efa R08: 1ffffffff11d1436 R09: ffff88820b807958 R10: ffff88820b807915 R11: 0000000000058071 R12: ffffffff88e8a1b2 R13: ffff88820b807918 R14: ffff88820b807968 R15: 0000000000000001 FS: 00007f683f5d0700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000004e7682e8 CR3: 000000005aa04000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __unwind_start arch/x86/kernel/unwind_orc.c:578 [inline] __unwind_start+0x450/0x800 arch/x86/kernel/unwind_orc.c:508 unwind_start arch/x86/include/asm/unwind.h:60 [inline] __save_stack_trace+0x4a/0xd0 arch/x86/kernel/stacktrace.c:43 save_stack+0x32/0xa0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xbf/0xe0 mm/kasan/kasan.c:529 kmem_cache_alloc+0x127/0x770 mm/slab.c:3552 __sigqueue_alloc+0x1b8/0x3e0 kernel/signal.c:400 __send_signal+0x194/0x1280 kernel/signal.c:1097 specific_send_sig_info kernel/signal.c:1208 [inline] force_sig_info+0x240/0x340 kernel/signal.c:1260 force_sig_info_fault.constprop.0+0x185/0x260 arch/x86/mm/fault.c:225 __bad_area_nosemaphore+0x1d9/0x2a0 arch/x86/mm/fault.c:940 __do_page_fault+0x859/0xb40 arch/x86/mm/fault.c:1412 page_fault+0x45/0x50 arch/x86/entry/entry_64.S:1122 RIP: 0bed:0x4ce103 RSP: 508600:000000000078c0e0 EFLAGS: ffffffff Code: 02 48 b9 00 00 00 00 00 fc ff df 48 8d 53 40 48 89 f8 48 c1 e8 03 0f b6 34 08 49 8d 44 24 03 49 89 c0 49 c1 e8 03 41 0f b6 0c 08 <49> 89 f8 41 83 e0 07 44 38 c6 41 0f 9e c0 40 84 f6 40 0f 95 c6