IPVS: ip_vs_svc_hash(): request for already hashed, called from do_ip_vs_set_ctl+0xa72/0xb40 net/netfilter/ipvs/ip_vs_ctl.c:2421 IPVS: ip_vs_svc_hash(): request for already hashed, called from do_ip_vs_set_ctl+0xa72/0xb40 net/netfilter/ipvs/ip_vs_ctl.c:2421 INFO: task syz-executor7:22468 blocked for more than 120 seconds. Not tainted 4.4.135-ge75204c #55 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor7 D ffff8801b8fdf4e0 26488 22468 3904 0x00000004 ffff8801b8fdf4e0 0000000000000041 000000000072bec8 10e4ccdcfe430f0b ffff8801b8fdf600 ffff8801db31fdb8 ffff8801db31fde0 ffff8801db31f4d8 ffff8801db31f4c0 ffff8801d373c800 ffff8800956a6000 0000000000000000 Call Trace: [] schedule+0x7a/0x1b0 kernel/sched/core.c:3359 [] schedule_timeout+0x481/0x8b0 kernel/time/timer.c:1515 [] io_schedule_timeout+0x1ba/0x390 kernel/sched/core.c:4941 [] io_schedule include/linux/sched.h:447 [inline] [] bit_wait_io+0x1b/0xd0 kernel/sched/wait.c:595 [] __wait_on_bit_lock.part.4+0x92/0x140 kernel/sched/wait.c:434 [] __wait_on_bit_lock+0x9/0x10 kernel/sched/wait.c:427 [] __lock_page+0x17d/0x1f0 mm/filemap.c:888 [] lock_page include/linux/pagemap.h:458 [inline] [] __generic_file_splice_read+0x7eb/0xbb0 fs/splice.c:412 [] generic_file_splice_read+0xe2/0x1c0 fs/splice.c:542 [] do_splice_to+0xf7/0x140 fs/splice.c:1154 [] splice_direct_to_actor+0x242/0x830 fs/splice.c:1226 [] do_splice_direct+0x1a3/0x270 fs/splice.c:1337 [] do_sendfile+0x4e4/0xb80 fs/read_write.c:1227 [] SYSC_sendfile64 fs/read_write.c:1282 [inline] [] SyS_sendfile64+0xc3/0x150 fs/read_write.c:1274 [] entry_SYSCALL_64_fastpath+0x22/0x9e no locks held by syz-executor7/22468. Sending NMI to all CPUs: NMI backtrace for cpu 0 CPU: 0 PID: 492 Comm: khungtaskd Not tainted 4.4.135-ge75204c #55 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8800bac9b000 task.stack: ffff8801d9200000 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+0xf6/0x1a0 arch/x86/kernel/apic/apic_flat_64.c:69 RSP: 0018:ffff8801d9207cc8 EFLAGS: 00000046 RAX: 0000000003000000 RBX: 0000000000000c00 RCX: 0000000000000000 RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fb300 RBP: ffff8801d9207cf0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000246 R13: 0000000000000003 R14: 0000000000000002 R15: ffffffff8446f7a0 FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001d5a000 CR3: 00000000aef5a000 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffffffff8446f7a0 ffffffff84a18e60 0000000000000007 fffffbfff0942c7c 0000000000000040 ffff8801d9207d10 ffffffff810b5e71 ffffffff83c0b560 0000000000000003 ffff8801d9207d68 ffffffff81e19d83 ffff8800956a6000 Call Trace: [] nmi_raise_cpu_backtrace+0x61/0x80 arch/x86/kernel/apic/hw_nmi.c:33 [] nmi_trigger_all_cpu_backtrace.cold.4+0x70/0xad 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.1+0xd3/0xee kernel/hung_task.c:238 [] kthread+0x268/0x300 kernel/kthread.c:211 [] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:510 Code: b3 5f ff f6 c4 10 75 e2 44 89 e8 c1 e0 18 89 04 25 10 b3 5f ff 44 89 f2 09 da 80 cf 04 41 83 fe 02 0f 44 d3 89 14 25 00 b3 5f ff <41> f7 c4 00 02 00 00 75 1a 4c 89 e7 57 9d 0f 1f 44 00 00 e8 72 NMI backtrace for cpu 1 CPU: 1 PID: 7 Comm: rcu_preempt Not tainted 4.4.135-ge75204c #55 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801d9a09800 task.stack: ffff8801d9a20000 RIP: 0010:[] [] debug_lockdep_rcu_enabled.part.3+0x2a/0x60 kernel/rcu/update.c:243 RSP: 0018:ffff8801d9a27908 EFLAGS: 00000807 RAX: dffffc0000000000 RBX: ffff8801d9a09800 RCX: 1ffff1003b341316 RDX: 0000000000000000 RSI: ffffffff84a152b8 RDI: ffff8801d9a0a0dc RBP: ffff8801d9a27910 R08: ffff88021fffd058 R09: ffffffff83a44860 R10: ffffed0043fffa09 R11: 0000000000000001 R12: ffff8801d9a09800 R13: 0000000000005132 R14: ffff8801d9a098b0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f903727f000 CR3: 00000000aef5a000 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffff8801d9a09860 ffff8801d9a27920 ffffffff81277487 ffff8801d9a27968 ffffffff811d9334 ffffffff810cbeb3 ffff8801d9a27948 0000000000000001 ffff8801db31f568 0000000000000001 dffffc0000000000 ffff8801d9a09860 Call Trace: [] debug_lockdep_rcu_enabled+0x77/0x90 kernel/rcu/update.c:242 [] trace_sched_stat_runtime include/trace/events/sched.h:455 [inline] [] update_curr+0x3c4/0x6d0 kernel/sched/fair.c:881 [] dequeue_entity kernel/sched/fair.c:3588 [inline] [] dequeue_task_fair+0x1aa/0xa90 kernel/sched/fair.c:4775 [] dequeue_task kernel/sched/core.c:866 [inline] [] deactivate_task+0xf5/0x2e0 kernel/sched/core.c:882 [] __schedule+0xb4e/0x1d70 kernel/sched/core.c:3290 [] schedule+0x7a/0x1b0 kernel/sched/core.c:3359 [] schedule_timeout+0x32d/0x8b0 kernel/time/timer.c:1538 [] rcu_gp_kthread+0xb6d/0x2220 kernel/rcu/tree.c:2121 [] kthread+0x268/0x300 kernel/kthread.c:211 [] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:510 Code: ff 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 53 65 48 8b 1c 25 00 67 01 00 48 8d bb dc 08 00 00 48 89 fa 48 c1 ea 03 0f b6 14 02 <48> 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 10 8b 93 dc 08