Free memory is -1156kB above reserved lowmemorykiller: Killing 'syz-executor1' (30780) (tgid 30773), adj 1000, to free 51384kB on behalf of 'kworker/u4:1' (28564) because cache 384kB is below limit 6144kB for oom_score_adj 0 Free memory is -1156kB above reserved INFO: task syz-executor1:30780 blocked for more than 140 seconds. Not tainted 4.4.171+ #11 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor1 D lowmemorykiller: Killing 'syz-executor1' (30780) (tgid 30773), adj 1000, to free 51384kB on behalf of 'init' (30854) because cache 384kB is below limit 6144kB for oom_score_adj 0 Free memory is -1156kB above reserved lowmemorykiller: Killing 'syz-executor1' (30780) (tgid 30773), adj 1000, to free 51384kB on behalf of 'rs:main Q:Reg' (1911) because cache 384kB is below limit 6144kB for oom_score_adj 0 Free memory is -1156kB above reserved ffff8801d8c6f968 29360 30780 2110 0x20120004 ffff8801d8c6f968 ffff8801d2928000 64c19f6b0978f3bf ffff8801d2928000 0000000000000000 ffff8801d2928800 ffff8801db71f180 ffff8801db71f1a8 ffff8801db71e898 ffff8801d3d75f00 ffff8801d2928000 ffffed003b18d001 Call Trace: [] schedule+0x99/0x1d0 kernel/sched/core.c:3355 [] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3388 [] __mutex_lock_common kernel/locking/mutex.c:582 [inline] [] mutex_lock_nested+0x3c2/0xb80 kernel/locking/mutex.c:621 [] copy_net_ns+0xca/0x250 net/core/net_namespace.c:387 [] create_new_namespaces+0x2f0/0x670 kernel/nsproxy.c:95 [] copy_namespaces+0x28a/0x320 kernel/nsproxy.c:150 [] copy_process+0x2472/0x68a0 kernel/fork.c:1522 [] _do_fork+0x14e/0xdc0 kernel/fork.c:1806 [] SYSC_clone kernel/fork.c:1917 [inline] [] SyS_clone+0x37/0x50 kernel/fork.c:1911 [] do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline] [] do_fast_syscall_32+0x32d/0xa90 arch/x86/entry/common.c:397 [] sysenter_flags_fixed+0xd/0x1a lowmemorykiller: Killing 'syz-executor1' (30780) (tgid 30773), adj 1000, to free 51384kB on behalf of 'syz-fuzzer' (2059) because cache 384kB is below limit 6144kB for oom_score_adj 0 Free memory is -1156kB above reserved lowmemorykiller: Killing 'syz-executor1' (30780) (tgid 30773), adj 1000, to free 51384kB on behalf of 'kswapd0' (28) because cache 384kB is below limit 6144kB for oom_score_adj 0 Free memory is -1156kB above reserved 1 lock held by syz-executor1/30780: #0: (net_mutex){+.+.+.}, at: [] copy_net_ns+0xca/0x250 net/core/net_namespace.c:387 Sending NMI to all CPUs: NMI backtrace for cpu 0 CPU: 0 PID: 1911 Comm: rs:main Q:Reg Not tainted 4.4.171+ #11 task: ffff8801d6d6af80 task.stack: ffff8801d6e88000 RIP: 0010:[] [] mark_lock+0xab/0x1440 kernel/locking/lockdep.c:2907 RSP: 0000:ffff8801d6e8f0c8 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: ffffffff83a87e80 RCX: 1ffff1003adad726 RDX: 1ffffffff0750fd6 RSI: ffff8801d6d6b910 RDI: ffffffff83a87eb0 RBP: ffff8801d6e8f110 R08: 0000000000000005 R09: ffff8801d6d6b930 R10: ffffffff82836880 R11: 0000000000000000 R12: ffff8801d6d6b910 R13: ffff8801d6d6af80 R14: 0000000000000100 R15: 0000000000000008 FS: 00007f8f58d44700(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000445828 CR3: 00000000b8c46000 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: 000000000000006c ffff8801d6d6af80 ffff8801d6d6b8e8 0000000000000000 000000000000006c ffff8801d6d6af80 ffff8801d6d6b910 0000000000000000 0000000000000000 ffff8801d6e8f2a0 ffffffff811ffdc7 0000000000000000 Call Trace: [] mark_irqflags kernel/locking/lockdep.c:2834 [inline] [] __lock_acquire+0xa27/0x4f50 kernel/locking/lockdep.c:3169 [] lock_acquire+0x15e/0x450 kernel/locking/lockdep.c:3592 [] __raw_spin_lock include/linux/spinlock_api_smp.h:144 [inline] [] _raw_spin_lock+0x38/0x50 kernel/locking/spinlock.c:151 [] spin_lock include/linux/spinlock.h:302 [inline] [] task_lock include/linux/sched.h:2969 [inline] [] find_lock_task_mm+0xf2/0x280 mm/oom_kill.c:109 [] lowmem_scan+0x45b/0xbf0 drivers/staging/android/lowmemorykiller.c:132 [] do_shrink_slab mm/vmscan.c:357 [inline] [] shrink_slab.part.0+0x402/0xb30 mm/vmscan.c:455 [] shrink_slab mm/vmscan.c:425 [inline] [] shrink_zone+0x4bc/0x610 mm/vmscan.c:2448 [] shrink_zones mm/vmscan.c:2603 [inline] [] do_try_to_free_pages mm/vmscan.c:2653 [inline] [] try_to_free_pages+0x66f/0x1260 mm/vmscan.c:2861 [] __perform_reclaim mm/page_alloc.c:2915 [inline] [] __alloc_pages_direct_reclaim mm/page_alloc.c:2936 [inline] [] __alloc_pages_slowpath mm/page_alloc.c:3201 [inline] [] __alloc_pages_nodemask+0x8af/0x14b0 mm/page_alloc.c:3313 [] __alloc_pages include/linux/gfp.h:415 [inline] [] __alloc_pages_node include/linux/gfp.h:428 [inline] [] alloc_pages_node include/linux/gfp.h:442 [inline] [] __page_cache_alloc include/linux/pagemap.h:226 [inline] [] page_cache_alloc_readahead include/linux/pagemap.h:242 [inline] [] __do_page_cache_readahead+0x222/0x840 mm/readahead.c:184 [] ra_submit mm/internal.h:55 [inline] [] do_sync_mmap_readahead mm/filemap.c:1917 [inline] [] filemap_fault+0x74e/0xc10 mm/filemap.c:1994 [] ext4_filemap_fault+0x72/0xa0 fs/ext4/inode.c:5558 [] __do_fault+0x1ca/0x350 mm/memory.c:2822 [] do_read_fault mm/memory.c:3012 [inline] [] do_fault mm/memory.c:3177 [inline] [] handle_pte_fault mm/memory.c:3346 [inline] [] __handle_mm_fault mm/memory.c:3474 [inline] [] handle_mm_fault+0x1cfc/0x3140 mm/memory.c:3503 [] __do_page_fault+0x28e/0x7f0 arch/x86/mm/fault.c:1243 [] do_page_fault+0x28/0x30 arch/x86/mm/fault.c:1306 [] page_fault+0x25/0x30 arch/x86/entry/entry_64.S:1064 Code: b0 01 00 00 48 81 eb b0 01 00 00 48 81 c3 40 c8 a7 83 48 8d 7b 30 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 <0f> 85 a5 0e 00 00 4c 85 73 30 0f 84 cb 00 00 00 41 be 01 00 00 NMI backtrace for cpu 1 CPU: 1 PID: 20 Comm: khungtaskd Not tainted 4.4.171+ #11 task: ffff8801da6c2f80 task.stack: ffff8800001c0000 RIP: 0010:[] [] _flat_send_IPI_mask arch/x86/kernel/apic/apic_flat_64.c:62 [inline] RIP: 0010:[] [] flat_send_IPI_mask+0xf7/0x1b0 arch/x86/kernel/apic/apic_flat_64.c:69 RSP: 0018:ffff8800001c7c88 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 0000000000000c00 RCX: 0000000000000000 RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fc300 RBP: ffff8800001c7cb8 R08: 0000000000000018 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000246 R13: 0000000003000000 R14: ffffffff82e5f2e0 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000004236d0 CR3: 00000000b2aa6000 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: 0000000000000001 ffffffff82e5f2e0 ffffffff831a6840 fffffbfff0634be4 000000000001b6c0 0000000000000008 ffff8800001c7cd8 ffffffff81092bee 0000000000000008 ffffffff82924260 ffff8800001c7d30 ffffffff81ab7ad2 Call Trace: [] nmi_raise_cpu_backtrace+0x5e/0x80 arch/x86/kernel/apic/hw_nmi.c:33 [] nmi_trigger_all_cpu_backtrace.cold+0xa1/0xae 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.cold+0xd3/0xee kernel/hung_task.c:238 [] kthread+0x273/0x310 kernel/kthread.c:211 [] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:537 Code: 00 c3 5f ff 80 e6 10 75 e1 41 c1 e5 18 44 89 2c 25 10 c3 5f ff 44 89 fa 09 da 80 cf 04 41 83 ff 02 0f 44 d3 89 14 25 00 c3 5f ff <41> f7 c4 00 02 00 00 75 1e 4c 89 e7 57 9d 0f 1f 44 00 00 e8 e1 lowmemorykiller: Killing 'syz-executor1' (30780) (tgid 30773), adj 1000, to free 51384kB on behalf of 'cron' (1965) because cache 384kB is below limit 6144kB for oom_score_adj 0 Free memory is -1156kB above reserved lowmemorykiller: Killing 'syz-executor1' (30780) (tgid 30773), adj 1000, to free 51384kB on behalf of 'syz-fuzzer' (2060) because cache 384kB is below limit 6144kB for oom_score_adj 0 Free memory is -1156kB above reserved lowmemorykiller: Killing 'syz-executor1' (30780) (tgid 30773), adj 1000, to free 51384kB on behalf of 'getty' (30848) because cache 384kB is below limit 6144kB for oom_score_adj 0 Free memory is -1156kB above reserved lowmemorykiller: Killing 'syz-executor1' (30780) (tgid 30773), adj 1000, to free 51384kB on behalf of 'init' (30854) because cache 384kB is below limit 6144kB for oom_score_adj 0 Free memory is -1156kB above reserved lowmemorykiller: Killing 'syz-executor1' (30780) (tgid 30773), adj 1000, to free 51384kB on behalf of 'kswapd0' (28) because cache 316kB is below limit 6144kB for oom_score_adj 0 Free memory is -1156kB above reserved lowmemorykiller: Killing 'syz-executor1' (30780) (tgid 30773), adj 1000, to free 51384kB on behalf of 'syz-executor2' (30836) because cache 316kB is below limit 6144kB for oom_score_adj 0 Free memory is -1156kB above reserved lowmemorykiller: Killing 'syz-executor1' (30780) (tgid 30773), adj 1000, to free 51384kB on behalf of 'rs:main Q:Reg' (1911) because cache 316kB is below limit 6144kB for oom_score_adj 0 Free memory is -1156kB above reserved lowmemorykiller: Killing 'syz-executor1' (30780) (tgid 30773), adj 1000, to free 51384kB on behalf of 'syz-fuzzer' (2060) because cache 316kB is below limit 6144kB for oom_score_adj 0 Free memory is -1156kB above reserved