====================================== | [ 8.382612] GACT probability NOT on | [ 8.432112] ------------[ cut here ]------------ | [ 8.432158] kernel BUG at net/core/skbuff.c:3505! | [ 8.432197] invalid opcode: 0000 [#1] PREEMPT SMP NOPTI [ 8.432272] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 8.432336] RIP: 0010:__skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) [ 8.432372] Code: 89 5c 24 04 44 89 d9 44 89 ff 44 89 ea ff d0 0f 1f 00 44 8b 5c 24 04 41 89 c7 eb b6 ff d0 0f 1f 00 41 89 c1 e9 71 fd ff ff 90 <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 All code ======== 0: 89 5c 24 04 mov %ebx,0x4(%rsp) 4: 44 89 d9 mov %r11d,%ecx 7: 44 89 ff mov %r15d,%edi a: 44 89 ea mov %r13d,%edx d: ff d0 call *%rax f: 0f 1f 00 nopl (%rax) 12: 44 8b 5c 24 04 mov 0x4(%rsp),%r11d 17: 41 89 c7 mov %eax,%r15d 1a: eb b6 jmp 0xffffffffffffffd2 1c: ff d0 call *%rax 1e: 0f 1f 00 nopl (%rax) 21: 41 89 c1 mov %eax,%r9d 24: e9 71 fd ff ff jmp 0xfffffffffffffd9a 29: 90 nop 2a:* 0f 0b ud2 <-- trapping instruction 2c: 66 66 2e 0f 1f 84 00 data16 cs nopw 0x0(%rax,%rax,1) 33: 00 00 00 00 37: 90 nop 38: 90 nop 39: 90 nop 3a: 90 nop 3b: 90 nop 3c: 90 nop 3d: 90 nop 3e: 90 nop 3f: 90 nop Code starting with the faulting instruction =========================================== 0: 0f 0b ud2 2: 66 66 2e 0f 1f 84 00 data16 cs nopw 0x0(%rax,%rax,1) 9: 00 00 00 00 d: 90 nop e: 90 nop f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop [ 8.432474] RSP: 0018:ffffb4bb80114db0 EFLAGS: 00010202 [ 8.432509] RAX: 0000000000000054 RBX: 0000000000000008 RCX: ffff98e501b73f00 [ 8.432553] RDX: ffff98e503a132c0 RSI: 00000000000002c0 RDI: ffff98e503a13000 [ 8.432606] RBP: ffffb4bb80114e08 R08: ffffb4bb80114e08 R09: 00000000b5b40203 [ 8.432653] R10: 0000000000000008 R11: 0000000000000001 R12: ffffffff912bba80 [ 8.432698] R13: 0000000000000008 R14: 0000000000000000 R15: 00000000b5b40203 [ 8.432744] FS: 00007fcf76497740(0000) GS:ffff98e53ed00000(0000) knlGS:0000000000000000 [ 8.432792] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 8.432828] CR2: 00007fcf768e7ff8 CR3: 0000000002468001 CR4: 0000000000770ef0 [ 8.432882] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 8.432925] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 8.432969] PKRU: 55555554 [ 8.432988] Call Trace: [ 8.433005] <IRQ> [ 8.433025] ? die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434 arch/x86/kernel/dumpstack.c:447) [ 8.433053] ? do_trap (arch/x86/kernel/traps.c:113 arch/x86/kernel/traps.c:154) [ 8.433081] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) [ 8.433107] ? do_error_trap (./arch/x86/include/asm/traps.h:58 arch/x86/kernel/traps.c:175) [ 8.433132] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) [ 8.433157] ? exc_invalid_op (arch/x86/kernel/traps.c:265) [ 8.433185] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) [ 8.433210] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) [ 8.433236] ? __skb_checksum (net/core/skbuff.c:3505 (discriminator 1)) [ 8.433261] __skb_checksum_complete (./arch/x86/include/asm/checksum_64.h:170 ./arch/x86/include/asm/checksum_64.h:180 net/core/skbuff.c:3643) [ 8.433292] ? __pfx_csum_partial_ext (./include/net/checksum.h:120) [ 8.433324] ? __pfx_csum_block_add_ext (./include/net/checksum.h:103) [ 8.433356] icmp_rcv (./include/linux/skbuff.h:4567 net/ipv4/icmp.c:1213) [ 8.433384] ip_protocol_deliver_rcu (net/ipv4/ip_input.c:205 (discriminator 5)) [ 8.433420] ip_local_deliver_finish (./include/linux/rcupdate.h:782 net/ipv4/ip_input.c:234) [ 8.433453] __netif_receive_skb_one_core (net/core/dev.c:5610 (discriminator 4)) [ 8.433490] process_backlog (./include/linux/rcupdate.h:782 net/core/dev.c:6053) [ 8.433517] __napi_poll (net/core/dev.c:6703) [ 8.433544] net_rx_action (net/core/dev.c:6774 net/core/dev.c:6886) [ 8.433571] __do_softirq (kernel/softirq.c:553) [ 8.433602] do_softirq (kernel/softirq.c:454 kernel/softirq.c:441) [ 8.433628] </IRQ> [ 8.433647] <TASK> [ 8.433666] __local_bh_enable_ip (kernel/softirq.c:381) [ 8.433691] __dev_queue_xmit (net/core/dev.c:4400) [ 8.433717] ? packet_parse_headers (./include/linux/skbuff.h:3007 net/packet/af_packet.c:1944) [ 8.433752] packet_sendmsg (net/packet/af_packet.c:3083 net/packet/af_packet.c:3115) [ 8.433780] ? netdev_name_node_lookup_rcu (net/core/dev.c:323) [ 8.433813] __sys_sendto (net/socket.c:730 net/socket.c:745 net/socket.c:2191) [ 8.433843] ? __rseq_handle_notify_resume (kernel/rseq.c:257 kernel/rseq.c:291 kernel/rseq.c:329) [ 8.433877] __x64_sys_sendto (net/socket.c:2203 net/socket.c:2199 net/socket.c:2199) [ 8.433902] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 8.433932] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) [ 8.433967] RIP: 0033:0x7fcf766f185a [ 8.433994] Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb b8 0f 1f 00 f3 0f 1e fa 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 15 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 7e c3 0f 1f 44 00 00 41 54 48 83 ec 30 44 89 All code ======== 0: d8 64 89 02 fsubs 0x2(%rcx,%rcx,4) 4: 48 c7 c0 ff ff ff ff mov $0xffffffffffffffff,%rax b: eb b8 jmp 0xffffffffffffffc5 d: 0f 1f 00 nopl (%rax) 10: f3 0f 1e fa endbr64 14: 41 89 ca mov %ecx,%r10d 17: 64 8b 04 25 18 00 00 mov %fs:0x18,%eax 1e: 00 1f: 85 c0 test %eax,%eax 21: 75 15 jne 0x38 23: b8 2c 00 00 00 mov $0x2c,%eax 28: 0f 05 syscall 2a:* 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax <-- trapping instruction 30: 77 7e ja 0xb0 32: c3 ret 33: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 38: 41 54 push %r12 3a: 48 83 ec 30 sub $0x30,%rsp 3e: 44 rex.R 3f: 89 .byte 0x89 Code starting with the faulting instruction =========================================== 0: 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax 6: 77 7e ja 0x86 8: c3 ret 9: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) e: 41 54 push %r12 10: 48 83 ec 30 sub $0x30,%rsp 14: 44 rex.R 15: 89 .byte 0x89 [ 8.434091] RSP: 002b:00007ffef90fb7c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c [ 8.434135] RAX: ffffffffffffffda RBX: 0000000000eef9d0 RCX: 00007fcf766f185a [ 8.434180] RDX: 0000000000000062 RSI: 0000000000eef5c2 RDI: 0000000000000005 [ 8.434225] RBP: 0000000000eef5c2 R08: 00007ffef90fb7d0 R09: 0000000000000014 [ 8.434269] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 Finger prints: __skb_checksum:__skb_checksum_complete:icmp_rcv:ip_protocol_deliver_rcu