watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor.5:10039] Modules linked in: irq event stamp: 4286321 hardirqs last enabled at (4286320): [<ffffffff87400976>] restore_regs_and_return_to_kernel+0x0/0x2a hardirqs last disabled at (4286321): [<ffffffff874018ae>] apic_timer_interrupt+0x8e/0xa0 arch/x86/entry/entry_64.S:793 softirqs last enabled at (82078): [<ffffffff8760068b>] __do_softirq+0x68b/0x9ff kernel/softirq.c:314 softirqs last disabled at (91225): [<ffffffff81321d13>] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (91225): [<ffffffff81321d13>] irq_exit+0x193/0x240 kernel/softirq.c:409 CPU: 0 PID: 10039 Comm: syz-executor.5 Not tainted 4.14.268-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880925ae200 task.stack: ffff88809fa00000 RIP: 0010:nf_hook_slow+0x33/0x1a0 net/netfilter/core.c:466 RSP: 0018:ffff8880ba4079f8 EFLAGS: 00000a02 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000000 RBX: ffff888098bfecc0 RCX: 0000000000000000 RDX: 1ffff1101317fd98 RSI: ffff8880ba407a80 RDI: ffff8880a9dcb440 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000022012 R10: ffff8880925aeb28 R11: ffff8880925ae200 R12: ffff8880a9dcb440 R13: ffff8880ba407a80 R14: ffff888098bfecc0 R15: ffff888056064040 FS: 00007f43251f2700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4ad6b90ce0 CR3: 0000000096d8d000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> nf_hook include/linux/netfilter.h:205 [inline] NF_HOOK_COND include/linux/netfilter.h:238 [inline] ip6_output+0x392/0x660 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 </IRQ> RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline] RIP: 0010:lock_acquire+0x1ec/0x3f0 kernel/locking/lockdep.c:4001 RSP: 0018:ffff88809fa076c0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff11e1279 RBX: ffff8880925ae200 RCX: 3ce90d0ccd849272 RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000286 RBP: ffffffff88f77980 R08: 0000000000000000 R09: 0000000000020012 R10: ffff8880925aeab0 R11: ffff8880925ae200 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000002 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:242 [inline] rcu_read_lock include/linux/rcupdate.h:629 [inline] lock_page_memcg+0x36/0x200 mm/memcontrol.c:1640 page_remove_file_rmap+0x2d/0x690 mm/rmap.c:1208 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: 0033:0x7f432687d049 RSP: 002b:00007f43251f2218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f432698ff68 RCX: 00007f432687d049 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f432698ff68 RBP: 00007f432698ff60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f432698ff6c R13: 00007ffdd9f3955f R14: 00007f43251f2300 R15: 0000000000022000 Code: f5 41 54 49 89 fc 55 89 cd 53 48 89 d3 48 83 ec 10 e8 a2 59 71 fb 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 04 02 <84> c0 74 08 3c 01 0f 8e 15 01 00 00 0f b7 03 39 c5 0f 83 d5 00 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 8014 Comm: syz-executor.2 Not tainted 4.14.268-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88809dcc43c0 task.stack: ffff88809a4c0000 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:ffff88809a4c7a60 EFLAGS: 00000297 RAX: ffff88809dcc43c0 RBX: 1ffff11013498f50 RCX: 1ffff11013b98992 RDX: 0000000000000000 RSI: ffff88809dcc4c70 RDI: 0000000000000286 RBP: ffff88809a4c7b08 R08: ffff88809dcc43c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff88809a4c7bc0 R14: 0000000000000001 R15: 0000000000000001 FS: 00005555561ea400(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555567a1708 CR3: 0000000096d8d000 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 flush_tlb_others arch/x86/include/asm/paravirt.h:309 [inline] flush_tlb_mm_range+0x158/0x2f0 arch/x86/mm/tlb.c:709 dup_mmap kernel/fork.c:721 [inline] dup_mm kernel/fork.c:1200 [inline] copy_mm kernel/fork.c:1255 [inline] copy_process.part.0+0x5fd9/0x71c0 kernel/fork.c:1791 copy_process kernel/fork.c:1606 [inline] _do_fork+0x184/0xc80 kernel/fork.c:2092 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7fdb1ea4863b RSP: 002b:00007ffe3e63c8d0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fdb1ea4863b RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000000001 R08: 0000000000000000 R09: 00005555561ea400 R10: 00005555561ea6d0 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffe3e63c9b0 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 51 c9 08 00 f3 90 <8b> 44 24 58 a8 01 75 f1 e8 42 c9 08 00 e8 3d c9 08 00 bf 01 00 ---------------- Code disassembly (best guess): 0: f5 cmc 1: 41 54 push %r12 3: 49 89 fc mov %rdi,%r12 6: 55 push %rbp 7: 89 cd mov %ecx,%ebp 9: 53 push %rbx a: 48 89 d3 mov %rdx,%rbx d: 48 83 ec 10 sub $0x10,%rsp 11: e8 a2 59 71 fb callq 0xfb7159b8 16: 48 89 da mov %rbx,%rdx 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 23: 48 c1 ea 03 shr $0x3,%rdx 27: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax * 2b: 84 c0 test %al,%al <-- trapping instruction 2d: 74 08 je 0x37 2f: 3c 01 cmp $0x1,%al 31: 0f 8e 15 01 00 00 jle 0x14c 37: 0f b7 03 movzwl (%rbx),%eax 3a: 39 c5 cmp %eax,%ebp 3c: 0f .byte 0xf 3d: 83 d5 00 adc $0x0,%ebp