audit: type=1804 audit(1619145384.074:16): pid=9895 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.0" name="/root/syzkaller-testdir865070127/syzkaller.SBYk3C/5/bus" dev="sda1" ino=13925 res=1 watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [syz-executor.4:9870] Modules linked in: irq event stamp: 6788733 hardirqs last enabled at (6788732): [] slab_alloc_node mm/slab.c:3334 [inline] hardirqs last enabled at (6788732): [] kmem_cache_alloc_node_trace+0x2da/0x3b0 mm/slab.c:3666 hardirqs last disabled at (6788733): [] trace_hardirqs_off_thunk+0x1a/0x1c softirqs last enabled at (730): [] fib_table_delete+0x969/0x1030 net/ipv4/fib_trie.c:1610 softirqs last disabled at (745): [] invoke_softirq kernel/softirq.c:372 [inline] softirqs last disabled at (745): [] irq_exit+0x215/0x260 kernel/softirq.c:412 CPU: 0 PID: 9870 Comm: syz-executor.4 Not tainted 4.19.188-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x4/0x20 kernel/kcov.c:188 Code: 84 00 00 00 00 00 48 8b 0c 24 0f b7 d6 0f b7 f7 bf 03 00 00 00 e9 ec fe ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 90 48 8b 0c 24 <89> f2 89 fe bf 05 00 00 00 e9 ce fe ff ff 66 66 2e 0f 1f 84 00 00 RSP: 0018:ffff8880ba007000 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff86d34068 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffff8880a0e27d00 R08: 000000003c8acd68 R09: 0000000000000007 R10: ffff8880990b0a60 R11: 0000000000000000 R12: ffff88804941adc0 R13: ffff88809cfa4100 R14: 0000000000000010 R15: ffff888049b18140 FS: 00007f033fdad700(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe93b0aaa8 CR3: 00000000ae831000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_read_lock_bh include/linux/rcupdate.h:706 [inline] ip_finish_output2+0x2d8/0x15a0 net/ipv4/ip_output.c:221 ip_do_fragment+0xe73/0x22c0 net/ipv4/ip_output.c:815 ip_fragment.constprop.0+0x174/0x240 net/ipv4/ip_output.c:551 ip_finish_output+0x7a4/0xd20 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip_output+0x203/0x5f0 net/ipv4/ip_output.c:406 dst_output include/net/dst.h:455 [inline] ip_local_out+0xaf/0x170 net/ipv4/ip_output.c:125 iptunnel_xmit+0x63b/0x9d0 net/ipv4/ip_tunnel_core.c:91 geneve_xmit_skb drivers/net/geneve.c:864 [inline] geneve_xmit+0xe7a/0x2a80 drivers/net/geneve.c:937 __netdev_start_xmit include/linux/netdevice.h:4345 [inline] netdev_start_xmit include/linux/netdevice.h:4359 [inline] xmit_one net/core/dev.c:3256 [inline] dev_hard_start_xmit+0x1a8/0x920 net/core/dev.c:3272 __dev_queue_xmit+0x269d/0x2e00 net/core/dev.c:3838 neigh_resolve_output+0x55a/0x910 net/core/neighbour.c:1374 neigh_output include/net/neighbour.h:501 [inline] ip6_finish_output2+0x113d/0x2290 net/ipv6/ip6_output.c:120 ip6_finish_output+0x795/0xe50 net/ipv6/ip6_output.c:192 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip6_output+0x205/0x770 net/ipv6/ip6_output.c:209 dst_output include/net/dst.h:455 [inline] NF_HOOK include/linux/netfilter.h:289 [inline] ndisc_send_skb+0xa24/0x1720 net/ipv6/ndisc.c:491 ndisc_send_rs+0x131/0x690 net/ipv6/ndisc.c:685 addrconf_rs_timer+0x384/0x6a0 net/ipv6/addrconf.c:3835 call_timer_fn+0x177/0x700 kernel/time/timer.c:1338 expire_timers+0x243/0x4e0 kernel/time/timer.c:1375 __run_timers kernel/time/timer.c:1696 [inline] run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1709 __do_softirq+0x265/0x980 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x215/0x260 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:535 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1098 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:unwind_get_return_address arch/x86/kernel/unwind_orc.c:297 [inline] RIP: 0010:unwind_get_return_address+0x66/0x90 arch/x86/kernel/unwind_orc.c:292 Code: 89 ea 48 c1 ea 03 80 3c 02 00 75 32 48 8b 7b 48 e8 7f 9e 15 00 85 c0 74 d3 48 b8 00 00 00 00 00 fc ff df 48 89 ea 48 c1 ea 03 <80> 3c 02 00 75 18 48 8b 43 48 5b 5d c3 e8 68 a1 6e 00 eb a8 48 89 RSP: 0018:ffff88809e3ae388 EFLAGS: 00000a02 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: ffff88809e3ae3b0 RCX: 0000000000000000 RDX: 1ffff11013c75c7f RSI: ffff88809e3ae210 RDI: ffffffff86e3b114 RBP: ffff88809e3ae3f8 R08: 0000000000000001 R09: 0000000000000001 R10: ffff88809e3ae40f R11: 0000000000074071 R12: ffff88809e3ae448 R13: 0000000000000000 R14: ffff88823b2b7540 R15: 00000000000000e8 __save_stack_trace+0xaf/0x190 arch/x86/kernel/stacktrace.c:45 save_stack mm/kasan/kasan.c:448 [inline] set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:553 kmem_cache_alloc_node+0x146/0x3b0 mm/slab.c:3649 __alloc_skb+0x71/0x560 net/core/skbuff.c:193 alloc_skb include/linux/skbuff.h:995 [inline] nlmsg_new include/net/netlink.h:511 [inline] rtmsg_fib+0x1fb/0x4e0 net/ipv4/fib_semantics.c:415 fib_table_delete+0x7a8/0x1030 net/ipv4/fib_trie.c:1599 fib_magic+0x361/0x540 net/ipv4/fib_frontend.c:892 fib_del_ifaddr+0xd0e/0xfd0 net/ipv4/fib_frontend.c:1095 fib_inetaddr_event+0xb4/0x2a0 net/ipv4/fib_frontend.c:1232 notifier_call_chain+0xc0/0x230 kernel/notifier.c:93 __blocking_notifier_call_chain kernel/notifier.c:317 [inline] __blocking_notifier_call_chain kernel/notifier.c:304 [inline] blocking_notifier_call_chain kernel/notifier.c:328 [inline] blocking_notifier_call_chain+0x85/0xa0 kernel/notifier.c:325 __inet_del_ifa+0x534/0xba0 net/ipv4/devinet.c:416 inet_del_ifa net/ipv4/devinet.c:446 [inline] inetdev_destroy net/ipv4/devinet.c:311 [inline] inetdev_event+0x5cb/0x1270 net/ipv4/devinet.c:1545 notifier_call_chain+0xc0/0x230 kernel/notifier.c:93 call_netdevice_notifiers_mtu net/core/dev.c:1785 [inline] dev_set_mtu_ext+0x384/0x580 net/core/dev.c:7811 do_setlink+0x484/0x3540 net/core/rtnetlink.c:2412 rtnl_group_changelink net/core/rtnetlink.c:2925 [inline] rtnl_newlink+0xbc9/0x15c0 net/core/rtnetlink.c:3083 rtnetlink_rcv_msg+0x453/0xb80 net/core/rtnetlink.c:4778 netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2455 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x6bb/0xc40 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:632 ___sys_sendmsg+0x7bb/0x8e0 net/socket.c:2115 __sys_sendmsg net/socket.c:2153 [inline] __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x132/0x220 net/socket.c:2160 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4665f9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f033fdad188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 00000000004665f9 RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000007 RBP: 00000000004bfbb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c008 R13: 00007ffed561166f R14: 00007f033fdad300 R15: 0000000000022000 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60