====================================== | [ 32.503815] #PF: supervisor read access in kernel mode | [ 32.503845] #PF: error_code(0x0000) - not-present page | [ 32.503876] PGD 404d067 P4D 404d067 PUD 1249067 PMD 0 | [ 32.503910] Oops: 0000 [#1] PREEMPT SMP NOPTI [ 32.503987] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 32.504050] RIP: 0010:nh_valid_get_del_req (./include/net/netlink.h:1680 net/ipv4/nexthop.c:3235) [ 32.504085] Code: 11 00 75 47 8b 47 14 85 c0 75 40 48 8b 46 08 48 85 c0 0f 84 81 00 00 00 8b 40 04 89 02 85 c0 74 51 48 8b 46 70 48 85 c0 74 10 <8b> 40 04 89 01 31 c0 48 83 c4 08 c3 cc cc cc cc c7 01 00 00 00 00 All code ======== 0: 11 00 adc %eax,(%rax) 2: 75 47 jne 0x4b 4: 8b 47 14 mov 0x14(%rdi),%eax 7: 85 c0 test %eax,%eax 9: 75 40 jne 0x4b b: 48 8b 46 08 mov 0x8(%rsi),%rax f: 48 85 c0 test %rax,%rax 12: 0f 84 81 00 00 00 je 0x99 18: 8b 40 04 mov 0x4(%rax),%eax 1b: 89 02 mov %eax,(%rdx) 1d: 85 c0 test %eax,%eax 1f: 74 51 je 0x72 21: 48 8b 46 70 mov 0x70(%rsi),%rax 25: 48 85 c0 test %rax,%rax 28: 74 10 je 0x3a 2a:* 8b 40 04 mov 0x4(%rax),%eax <-- trapping instruction 2d: 89 01 mov %eax,(%rcx) 2f: 31 c0 xor %eax,%eax 31: 48 83 c4 08 add $0x8,%rsp 35: c3 ret 36: cc int3 37: cc int3 38: cc int3 39: cc int3 3a: c7 01 00 00 00 00 movl $0x0,(%rcx) Code starting with the faulting instruction =========================================== 0: 8b 40 04 mov 0x4(%rax),%eax 3: 89 01 mov %eax,(%rcx) 5: 31 c0 xor %eax,%eax 7: 48 83 c4 08 add $0x8,%rsp b: c3 ret c: cc int3 d: cc int3 e: cc int3 f: cc int3 10: c7 01 00 00 00 00 movl $0x0,(%rcx) [ 32.504178] RSP: 0018:ffffa4c1011c39d8 EFLAGS: 00010202 [ 32.504209] RAX: 0000000000000246 RBX: ffffa4c1011c3b58 RCX: ffffa4c1011c39e8 [ 32.504252] RDX: ffffa4c1011c39ec RSI: ffffa4c1011c3a08 RDI: ffff8b02427de880 [ 32.504296] RBP: ffff8b0242369f00 R08: ffffa4c1011c3b58 R09: ffffa4c1011c3b58 [ 32.504334] R10: ffffa4c1011c3a08 R11: 0000000000000002 R12: 0000000000000000 [ 32.504377] R13: ffff8b02427de880 R14: 0000000000000000 R15: 0000000000000000 [ 32.504416] FS: 00007fc9728d8c40(0000) GS:ffff8b027ed00000(0000) knlGS:0000000000000000 [ 32.504459] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.504495] CR2: 000000000000024a CR3: 00000000040c4003 CR4: 0000000000770ef0 [ 32.504534] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.504576] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.504614] PKRU: 55555554 [ 32.504626] Call Trace: [ 32.504642] <TASK> [ 32.504658] ? __die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434) [ 32.504687] ? page_fault_oops (arch/x86/mm/fault.c:707) [ 32.504712] ? exc_page_fault (./arch/x86/include/asm/irqflags.h:37 ./arch/x86/include/asm/irqflags.h:72 arch/x86/mm/fault.c:1506 arch/x86/mm/fault.c:1554) [ 32.504739] ? asm_exc_page_fault (./arch/x86/include/asm/idtentry.h:570) [ 32.504766] ? nh_valid_get_del_req (./include/net/netlink.h:1680 net/ipv4/nexthop.c:3235) [ 32.504796] ? rtm_del_nexthop (./include/net/netlink.h:756 ./include/net/netlink.h:777 net/ipv4/nexthop.c:3258) [ 32.504820] rtm_del_nexthop (net/ipv4/nexthop.c:3264) [ 32.504847] ? skb_queue_tail (./include/linux/spinlock.h:406 net/core/skbuff.c:3975) [ 32.504872] rtnetlink_rcv_msg (net/core/rtnetlink.c:6595) [ 32.504898] ? netlink_dump (net/netlink/af_netlink.c:2324 (discriminator 2)) [ 32.504923] ? __pfx_rtnetlink_rcv_msg (net/core/rtnetlink.c:6489) [ 32.504954] netlink_rcv_skb (net/netlink/af_netlink.c:2559) [ 32.504980] netlink_unicast (net/netlink/af_netlink.c:1335 net/netlink/af_netlink.c:1361) [ 32.505004] netlink_sendmsg (net/netlink/af_netlink.c:1905) [ 32.505027] ____sys_sendmsg (net/socket.c:730 net/socket.c:745 net/socket.c:2584) [ 32.505053] ? copy_msghdr_from_user (net/socket.c:2524) [ 32.505086] ___sys_sendmsg (net/socket.c:2640) [ 32.505110] ? ___sys_recvmsg (net/socket.c:2848) [ 32.505134] ? __sys_sendto (net/socket.c:730 net/socket.c:745 net/socket.c:2191) [ 32.505159] __sys_sendmsg (./include/linux/file.h:32 net/socket.c:2669) [ 32.505183] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 32.505208] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) [ 32.505241] RIP: 0033:0x7fc972ae17b7 [ 32.505263] Code: 0a 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b9 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 89 54 24 1c 48 89 74 24 10 All code ======== 0: 0a 00 or (%rax),%al 2: f7 d8 neg %eax 4: 64 89 02 mov %eax,%fs:(%rdx) 7: 48 c7 c0 ff ff ff ff mov $0xffffffffffffffff,%rax e: eb b9 jmp 0xffffffffffffffc9 10: 0f 1f 00 nopl (%rax) 13: f3 0f 1e fa endbr64 17: 64 8b 04 25 18 00 00 mov %fs:0x18,%eax 1e: 00 1f: 85 c0 test %eax,%eax 21: 75 10 jne 0x33 23: b8 2e 00 00 00 mov $0x2e,%eax 28: 0f 05 syscall 2a:* 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax <-- trapping instruction 30: 77 51 ja 0x83 32: c3 ret 33: 48 83 ec 28 sub $0x28,%rsp 37: 89 54 24 1c mov %edx,0x1c(%rsp) 3b: 48 89 74 24 10 mov %rsi,0x10(%rsp) Code starting with the faulting instruction =========================================== 0: 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax 6: 77 51 ja 0x59 8: c3 ret 9: 48 83 ec 28 sub $0x28,%rsp d: 89 54 24 1c mov %edx,0x1c(%rsp) 11: 48 89 74 24 10 mov %rsi,0x10(%rsp) [ 32.505362] RSP: 002b:00007ffdf7f59218 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 32.505405] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fc972ae17b7 [ 32.505442] RDX: 0000000000000000 RSI: 00007ffdf7f59280 RDI: 0000000000000006 [ 32.505486] RBP: 00007ffdf7f59518 R08: 0000000000000004 R09: 0000000000000078 [ 32.505529] R10: 00007fc97299a708 R11: 0000000000000246 R12: 0000000000495540 Finger prints: nh_valid_get_del_req:rtm_del_nexthop:rtnetlink_rcv_msg:netlink_rcv_skb