print_req_error: I/O error, dev loop0, sector 4 Buffer I/O error on dev loop0, logical block 2, async page read print_req_error: I/O error, dev loop0, sector 6 Buffer I/O error on dev loop0, logical block 3, async page read watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [syz-executor.5:9462] Modules linked in: irq event stamp: 4319429 hardirqs last enabled at (4319428): [] restore_regs_and_return_to_kernel+0x0/0x2a hardirqs last disabled at (4319429): [] apic_timer_interrupt+0x8e/0xa0 arch/x86/entry/entry_64.S:793 softirqs last enabled at (41158): [] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (43547): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (43547): [] irq_exit+0x193/0x240 kernel/softirq.c:409 CPU: 0 PID: 9462 Comm: syz-executor.5 Not tainted 4.14.272-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88809566a280 task.stack: ffff888055cf8000 RIP: 0010:skb_dst_drop include/net/dst.h:299 [inline] RIP: 0010:__dev_queue_xmit+0xc15/0x2480 net/core/dev.c:3480 RSP: 0018:ffff8880ba4077a0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 RAX: dffffc0000000000 RBX: ffff8880a3aa8e00 RCX: 1ffff11012acd56a RDX: 1ffff1101385664b RSI: ffff88809566aba8 RDI: 0000000000000286 RBP: ffff88809c2b3200 R08: 0000000000000286 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88809c2b3258 R13: 0000000000000020 R14: ffff88809c2b32d8 R15: ffff88809eb3f340 FS: 00007fede9b46700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2e428000 CR3: 00000000a94d9000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: neigh_output include/net/neighbour.h:500 [inline] ip6_finish_output2+0xf48/0x1f10 net/ipv6/ip6_output.c:120 ip6_finish_output+0x5c6/0xd50 net/ipv6/ip6_output.c:192 NF_HOOK_COND include/linux/netfilter.h:239 [inline] ip6_output+0x1c5/0x660 net/ipv6/ip6_output.c:209 dst_output include/net/dst.h:470 [inline] NF_HOOK include/linux/netfilter.h:250 [inline] ndisc_send_skb+0x82a/0x1390 net/ipv6/ndisc.c:483 ndisc_send_rs+0x125/0x630 net/ipv6/ndisc.c:677 addrconf_rs_timer+0x2bb/0x5a0 net/ipv6/addrconf.c:3769 call_timer_fn+0x14a/0x650 kernel/time/timer.c:1280 expire_timers+0x232/0x4d0 kernel/time/timer.c:1319 __run_timers kernel/time/timer.c:1637 [inline] run_timer_softirq+0x1d5/0x5a0 kernel/time/timer.c:1650 __do_softirq+0x24d/0x9ff kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x193/0x240 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:638 [inline] smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1106 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline] RIP: 0010:lock_release+0x41e/0x870 kernel/locking/lockdep.c:4020 RSP: 0018:ffff888055cff708 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff11e12f1 RBX: 1ffff1100ab9fee4 RCX: 1ffff11012acd566 RDX: dffffc0000000000 RSI: 0000000000000002 RDI: 0000000000000286 RBP: ffff88809566a280 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000000 R11: ffff88809566a280 R12: 902dbacb38b3c08e R13: 0000000000000003 R14: ffff88809566a280 R15: 0000000000000002 page_remove_rmap+0x96/0xe0 mm/rmap.c:1293 zap_pte_range mm/memory.c:1364 [inline] zap_pmd_range mm/memory.c:1466 [inline] zap_pud_range mm/memory.c:1495 [inline] zap_p4d_range mm/memory.c:1516 [inline] unmap_page_range+0xf3f/0x1ce0 mm/memory.c:1537 unmap_single_vma+0x147/0x2b0 mm/memory.c:1582 unmap_vmas+0x9d/0x160 mm/memory.c:1612 exit_mmap+0x270/0x4d0 mm/mmap.c:3058 __mmput kernel/fork.c:931 [inline] mmput kernel/fork.c:952 [inline] mmput+0xfa/0x420 kernel/fork.c:947 exit_mm kernel/exit.c:548 [inline] do_exit+0x984/0x2850 kernel/exit.c:855 do_group_exit+0x100/0x2e0 kernel/exit.c:965 get_signal+0x38d/0x1ca0 kernel/signal.c:2412 do_signal+0x7c/0x1550 arch/x86/kernel/signal.c:792 exit_to_usermode_loop+0x160/0x200 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7fedeb1d1049 RSP: 002b:00007fede9b46168 EFLAGS: 00000246 ORIG_RAX: 000000000000010e RAX: fffffffffffffdfe RBX: 00007fedeb2e3f60 RCX: 00007fedeb1d1049 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000040 RBP: 00007fedeb22b08d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000140 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff0c6ee77f R14: 00007fede9b46300 R15: 0000000000022000 Code: fa ff ff e8 ee c9 90 fb f6 c3 01 0f 84 37 09 00 00 e8 e0 c9 90 fb 4c 89 e2 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 <0f> 85 d6 15 00 00 48 c7 45 58 00 00 00 00 e9 7b fa ff ff e8 b3 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 9532 Comm: syz-executor.3 Not tainted 4.14.272-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88805421e600 task.stack: ffff888054220000 RIP: 0010:__read_once_size include/linux/compiler.h:185 [inline] RIP: 0010:csd_lock_wait kernel/smp.c:108 [inline] RIP: 0010:smp_call_function_single+0x181/0x370 kernel/smp.c:302 RSP: 0018:ffff888054227820 EFLAGS: 00000246 RAX: 0000000000040000 RBX: 1ffff1100a844f08 RCX: ffffc900069e5000 RDX: 0000000000040000 RSI: ffffffff814c78df RDI: 0000000000000286 RBP: ffff8880542278c8 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000001 FS: 00007fe5bb41f700(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000200004c0 CR3: 00000000b3000000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: smp_call_function_many+0x60f/0x7a0 kernel/smp.c:434 smp_call_function kernel/smp.c:492 [inline] on_each_cpu+0x40/0x210 kernel/smp.c:602 text_poke_bp+0x90/0x110 arch/x86/kernel/alternative.c:796 __jump_label_transform+0x269/0x300 arch/x86/kernel/jump_label.c:102 arch_jump_label_transform+0x26/0x40 arch/x86/kernel/jump_label.c:110 __jump_label_update+0x113/0x170 kernel/jump_label.c:374 jump_label_update kernel/jump_label.c:741 [inline] jump_label_update+0x140/0x2d0 kernel/jump_label.c:720 static_key_slow_inc_cpuslocked+0x10e/0x170 kernel/jump_label.c:109 static_key_slow_inc+0x16/0x20 kernel/jump_label.c:124 tracepoint_add_func+0x747/0xa40 kernel/tracepoint.c:269 tracepoint_probe_register_prio kernel/tracepoint.c:331 [inline] tracepoint_probe_register+0x8c/0xc0 kernel/tracepoint.c:352 trace_event_reg+0x272/0x330 kernel/trace/trace_events.c:305 perf_trace_event_reg kernel/trace/trace_event_perf.c:122 [inline] perf_trace_event_init kernel/trace/trace_event_perf.c:197 [inline] perf_trace_init+0x424/0xa30 kernel/trace/trace_event_perf.c:221 perf_tp_event_init+0x79/0xf0 kernel/events/core.c:8140 perf_try_init_event+0x15b/0x1f0 kernel/events/core.c:9371 perf_init_event kernel/events/core.c:9409 [inline] perf_event_alloc.part.0+0xe2d/0x2640 kernel/events/core.c:9669 perf_event_alloc kernel/events/core.c:10022 [inline] SYSC_perf_event_open kernel/events/core.c:10126 [inline] SyS_perf_event_open+0x67f/0x24b0 kernel/events/core.c:10012 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7fe5bcaaa049 RSP: 002b:00007fe5bb41f168 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007fe5bcbbcf60 RCX: 00007fe5bcaaa049 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200004c0 RBP: 00007fe5bcb0408d R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd2585e68f R14: 00007fe5bb41f300 R15: 0000000000022000 Code: c9 08 00 48 8b 54 24 10 4c 89 e9 8b 7c 24 1c 48 8d 74 24 40 e8 71 fa ff ff 41 89 c4 8b 44 24 58 a8 01 74 0f e8 61 c9 08 00 f3 90 <8b> 44 24 58 a8 01 75 f1 e8 52 c9 08 00 e8 4d c9 08 00 bf 01 00 ---------------- Code disassembly (best guess), 3 bytes skipped: 0: e8 ee c9 90 fb callq 0xfb90c9f3 5: f6 c3 01 test $0x1,%bl 8: 0f 84 37 09 00 00 je 0x945 e: e8 e0 c9 90 fb callq 0xfb90c9f3 13: 4c 89 e2 mov %r12,%rdx 16: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1d: fc ff df 20: 48 c1 ea 03 shr $0x3,%rdx 24: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) * 28: 0f 85 d6 15 00 00 jne 0x1604 <-- trapping instruction 2e: 48 c7 45 58 00 00 00 movq $0x0,0x58(%rbp) 35: 00 36: e9 7b fa ff ff jmpq 0xfffffab6 3b: e8 .byte 0xe8 3c: b3 .byte 0xb3