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Date: Fri, 13 May 2011 15:30:08 -0400 From: TB <lkml@...hboom.com> To: Eric Dumazet <eric.dumazet@...il.com> CC: linux-kernel@...r.kernel.org, netdev <netdev@...r.kernel.org> Subject: Re: kernel BUG at net/ipv4/tcp_output.c:1006! On 11-05-13 01:27 PM, Eric Dumazet wrote: > Le vendredi 13 mai 2011 à 13:11 -0400, TB a écrit : >> This is the 2.6.38.5 kernel with the patch in >> [PATCH] tcp_cubic: limit delayed_ack ratio to prevent divide error >> > > Please send us full disassembly of tcp_fragment (from vmlinux file) GCC is debian 4.3.2-1.1 AS 2.18.0.20080103 CPU is Intel Xeon E5620 Kernel CPU is set to MCORE2 (Core 2/newer Xeon) ffffffff814e7eb0 <tcp_fragment>: ffffffff814e7eb0: 41 57 push %r15 ffffffff814e7eb2: 49 89 ff mov %rdi,%r15 ffffffff814e7eb5: 41 56 push %r14 ffffffff814e7eb7: 41 55 push %r13 ffffffff814e7eb9: 41 89 d5 mov %edx,%r13d ffffffff814e7ebc: 41 54 push %r12 ffffffff814e7ebe: 55 push %rbp ffffffff814e7ebf: 53 push %rbx ffffffff814e7ec0: 48 89 f3 mov %rsi,%rbx ffffffff814e7ec3: 48 83 ec 18 sub $0x18,%rsp ffffffff814e7ec7: 89 4c 24 0c mov %ecx,0xc(%rsp) ffffffff814e7ecb: 8b 6e 68 mov 0x68(%rsi),%ebp ffffffff814e7ece: 39 ea cmp %ebp,%edx ffffffff814e7ed0: 76 04 jbe ffffffff814e7ed6 <tcp_fragment+0x26> ffffffff814e7ed2: 0f 0b ud2a ffffffff814e7ed4: eb fe jmp ffffffff814e7ed4 <tcp_fragment+0x24> ffffffff814e7ed6: 44 8b 66 6c mov 0x6c(%rsi),%r12d ffffffff814e7eda: f6 46 7c 02 testb $0x2,0x7c(%rsi) ffffffff814e7ede: 74 33 je ffffffff814e7f13 <tcp_fragment+0x63> ffffffff814e7ee0: 8b 86 b4 00 00 00 mov 0xb4(%rsi),%eax ffffffff814e7ee6: 48 03 86 b8 00 00 00 add 0xb8(%rsi),%rax ffffffff814e7eed: 8b 40 28 mov 0x28(%rax),%eax ffffffff814e7ef0: 66 ff c8 dec %ax ffffffff814e7ef3: 74 1e je ffffffff814e7f13 <tcp_fragment+0x63> ffffffff814e7ef5: 45 85 e4 test %r12d,%r12d ffffffff814e7ef8: 74 19 je ffffffff814e7f13 <tcp_fragment+0x63> ffffffff814e7efa: 31 d2 xor %edx,%edx ffffffff814e7efc: 31 f6 xor %esi,%esi ffffffff814e7efe: b9 20 00 00 00 mov $0x20,%ecx ffffffff814e7f03: 48 89 df mov %rbx,%rdi ffffffff814e7f06: e8 68 fe fb ff callq ffffffff814a7d73 <pskb_expand_head> ffffffff814e7f0b: 85 c0 test %eax,%eax ffffffff814e7f0d: 0f 85 23 02 00 00 jne ffffffff814e8136 <tcp_fragment+0x286> ffffffff814e7f13: 44 29 e5 sub %r12d,%ebp ffffffff814e7f16: 45 31 f6 xor %r14d,%r14d ffffffff814e7f19: 89 e8 mov %ebp,%eax ffffffff814e7f1b: ba 20 00 00 00 mov $0x20,%edx ffffffff814e7f20: 44 29 e8 sub %r13d,%eax ffffffff814e7f23: 4c 89 ff mov %r15,%rdi ffffffff814e7f26: 44 0f 49 f0 cmovns %eax,%r14d ffffffff814e7f2a: 44 89 f6 mov %r14d,%esi ffffffff814e7f2d: e8 82 51 ff ff callq ffffffff814dd0b4 <sk_stream_alloc_skb> ffffffff814e7f32: 48 89 c5 mov %rax,%rbp ffffffff814e7f35: 48 85 c0 test %rax,%rax ffffffff814e7f38: 0f 84 f8 01 00 00 je ffffffff814e8136 <tcp_fragment+0x286> ffffffff814e7f3e: 8b 80 c8 00 00 00 mov 0xc8(%rax),%eax ffffffff814e7f44: 41 01 87 1c 01 00 00 add %eax,0x11c(%r15) ffffffff814e7f4b: 49 8b 47 28 mov 0x28(%r15),%rax ffffffff814e7f4f: 8b 95 c8 00 00 00 mov 0xc8(%rbp),%edx ffffffff814e7f55: 48 83 b8 c8 00 00 00 cmpq $0x0,0xc8(%rax) ffffffff814e7f5c: 00 ffffffff814e7f5d: 74 07 je ffffffff814e7f66 <tcp_fragment+0xb6> ffffffff814e7f5f: 41 29 97 98 00 00 00 sub %edx,0x98(%r15) ffffffff814e7f66: 8b 43 68 mov 0x68(%rbx),%eax ffffffff814e7f69: 4c 8d 63 28 lea 0x28(%rbx),%r12 ffffffff814e7f6d: 44 29 e8 sub %r13d,%eax ffffffff814e7f70: 44 89 ea mov %r13d,%edx ffffffff814e7f73: 44 29 f0 sub %r14d,%eax ffffffff814e7f76: 01 85 c8 00 00 00 add %eax,0xc8(%rbp) ffffffff814e7f7c: 29 83 c8 00 00 00 sub %eax,0xc8(%rbx) ffffffff814e7f82: 48 8d 45 28 lea 0x28(%rbp),%rax ffffffff814e7f86: 48 89 44 24 10 mov %rax,0x10(%rsp) ffffffff814e7f8b: 41 03 54 24 10 add 0x10(%r12),%edx ffffffff814e7f90: 89 50 10 mov %edx,0x10(%rax) ffffffff814e7f93: 41 8b 44 24 14 mov 0x14(%r12),%eax ffffffff814e7f98: 48 8b 4c 24 10 mov 0x10(%rsp),%rcx ffffffff814e7f9d: 89 41 14 mov %eax,0x14(%rcx) ffffffff814e7fa0: 41 89 54 24 14 mov %edx,0x14(%r12) ffffffff814e7fa5: 41 8a 54 24 1c mov 0x1c(%r12),%dl ffffffff814e7faa: 88 d0 mov %dl,%al ffffffff814e7fac: 83 e0 f6 and $0xfffffffffffffff6,%eax ffffffff814e7faf: 41 88 44 24 1c mov %al,0x1c(%r12) ffffffff814e7fb4: 88 51 1c mov %dl,0x1c(%rcx) ffffffff814e7fb7: 41 8a 44 24 1d mov 0x1d(%r12),%al ffffffff814e7fbc: 88 41 1d mov %al,0x1d(%rcx) ffffffff814e7fbf: 8b 93 b4 00 00 00 mov 0xb4(%rbx),%edx ffffffff814e7fc5: 48 8b 83 b8 00 00 00 mov 0xb8(%rbx),%rax ffffffff814e7fcc: 66 83 3c 10 00 cmpw $0x0,(%rax,%rdx,1) ffffffff814e7fd1: 75 6e jne ffffffff814e8041 <tcp_fragment+0x191> ffffffff814e7fd3: 8a 43 7c mov 0x7c(%rbx),%al ffffffff814e7fd6: 83 e0 0c and $0xc,%eax ffffffff814e7fd9: 3c 0c cmp $0xc,%al ffffffff814e7fdb: 74 64 je ffffffff814e8041 <tcp_fragment+0x191> ffffffff814e7fdd: 44 89 f6 mov %r14d,%esi ffffffff814e7fe0: 48 89 ef mov %rbp,%rdi ffffffff814e7fe3: e8 da f7 fb ff callq ffffffff814a77c2 <skb_put> ffffffff814e7fe8: 31 c9 xor %ecx,%ecx ffffffff814e7fea: 48 89 c6 mov %rax,%rsi ffffffff814e7fed: 44 89 ef mov %r13d,%edi ffffffff814e7ff0: 44 89 f2 mov %r14d,%edx ffffffff814e7ff3: 48 03 bb c0 00 00 00 add 0xc0(%rbx),%rdi ffffffff814e7ffa: e8 91 4f 05 00 callq ffffffff8153cf90 <csum_partial_copy_nocheck> ffffffff814e7fff: 44 89 ee mov %r13d,%esi ffffffff814e8002: 89 45 74 mov %eax,0x74(%rbp) ffffffff814e8005: 48 89 df mov %rbx,%rdi ffffffff814e8008: e8 09 de fb ff callq ffffffff814a5e16 <skb_trim> ffffffff814e800d: 8b 45 74 mov 0x74(%rbp),%eax ffffffff814e8010: 8b 4b 74 mov 0x74(%rbx),%ecx ffffffff814e8013: 41 80 e5 01 and $0x1,%r13b ffffffff814e8017: 74 15 je ffffffff814e802e <tcp_fragment+0x17e> ffffffff814e8019: 89 c2 mov %eax,%edx ffffffff814e801b: c1 e8 08 shr $0x8,%eax ffffffff814e801e: 81 e2 ff 00 ff 00 and $0xff00ff,%edx ffffffff814e8024: 25 ff 00 ff 00 and $0xff00ff,%eax ffffffff814e8029: c1 e2 08 shl $0x8,%edx ffffffff814e802c: 01 d0 add %edx,%eax ffffffff814e802e: f7 d0 not %eax ffffffff814e8030: 89 c2 mov %eax,%edx ffffffff814e8032: 01 ca add %ecx,%edx ffffffff814e8034: 0f 92 c0 setb %al ffffffff814e8037: 0f b6 c0 movzbl %al,%eax ffffffff814e803a: 01 d0 add %edx,%eax ffffffff814e803c: 89 43 74 mov %eax,0x74(%rbx) ffffffff814e803f: eb 12 jmp ffffffff814e8053 <tcp_fragment+0x1a3> ffffffff814e8041: 80 4b 7c 0c orb $0xc,0x7c(%rbx) ffffffff814e8045: 44 89 ea mov %r13d,%edx ffffffff814e8048: 48 89 ee mov %rbp,%rsi ffffffff814e804b: 48 89 df mov %rbx,%rdi ffffffff814e804e: e8 f8 f7 fb ff callq ffffffff814a784b <skb_split> ffffffff814e8053: 8a 53 7c mov 0x7c(%rbx),%dl ffffffff814e8056: 8a 45 7c mov 0x7c(%rbp),%al ffffffff814e8059: 83 e2 0c and $0xc,%edx ffffffff814e805c: 83 e0 f3 and $0xfffffffffffffff3,%eax ffffffff814e805f: 48 89 de mov %rbx,%rsi ffffffff814e8062: 09 d0 or %edx,%eax ffffffff814e8064: 4c 89 ff mov %r15,%rdi ffffffff814e8067: 88 45 7c mov %al,0x7c(%rbp) ffffffff814e806a: 41 8b 44 24 18 mov 0x18(%r12),%eax ffffffff814e806f: 48 8b 54 24 10 mov 0x10(%rsp),%rdx ffffffff814e8074: 89 42 18 mov %eax,0x18(%rdx) ffffffff814e8077: 48 8b 43 10 mov 0x10(%rbx),%rax ffffffff814e807b: 8b 93 b4 00 00 00 mov 0xb4(%rbx),%edx ffffffff814e8081: 48 89 45 10 mov %rax,0x10(%rbp) ffffffff814e8085: 48 8b 83 b8 00 00 00 mov 0xb8(%rbx),%rax ffffffff814e808c: 44 8b 64 10 04 mov 0x4(%rax,%rdx,1),%r12d ffffffff814e8091: 8b 54 24 0c mov 0xc(%rsp),%edx ffffffff814e8095: e8 3d dd ff ff callq ffffffff814e5dd7 <tcp_set_skb_tso_segs> ffffffff814e809a: 8b 54 24 0c mov 0xc(%rsp),%edx ffffffff814e809e: 48 89 ee mov %rbp,%rsi ffffffff814e80a1: 4c 89 ff mov %r15,%rdi ffffffff814e80a4: e8 2e dd ff ff callq ffffffff814e5dd7 <tcp_set_skb_tso_segs> ffffffff814e80a9: 48 8b 4c 24 10 mov 0x10(%rsp),%rcx ffffffff814e80ae: 8b 49 14 mov 0x14(%rcx),%ecx ffffffff814e80b1: 41 39 8f 1c 04 00 00 cmp %ecx,0x41c(%r15) ffffffff814e80b8: 78 39 js ffffffff814e80f3 <tcp_fragment+0x243> ffffffff814e80ba: 8b 8b b4 00 00 00 mov 0xb4(%rbx),%ecx ffffffff814e80c0: 41 0f b7 d4 movzwl %r12w,%edx ffffffff814e80c4: 48 8b 83 b8 00 00 00 mov 0xb8(%rbx),%rax ffffffff814e80cb: 0f b7 44 08 04 movzwl 0x4(%rax,%rcx,1),%eax ffffffff814e80d0: 8b 8d b4 00 00 00 mov 0xb4(%rbp),%ecx ffffffff814e80d6: 29 c2 sub %eax,%edx ffffffff814e80d8: 48 8b 85 b8 00 00 00 mov 0xb8(%rbp),%rax ffffffff814e80df: 0f b7 44 08 04 movzwl 0x4(%rax,%rcx,1),%eax ffffffff814e80e4: 29 c2 sub %eax,%edx ffffffff814e80e6: 74 0b je ffffffff814e80f3 <tcp_fragment+0x243> ffffffff814e80e8: 48 89 de mov %rbx,%rsi ffffffff814e80eb: 4c 89 ff mov %r15,%rdi ffffffff814e80ee: e8 1a f4 ff ff callq ffffffff814e750d <tcp_adjust_pcount> ffffffff814e80f3: 8a 45 7c mov 0x7c(%rbp),%al ffffffff814e80f6: a8 10 test $0x10,%al ffffffff814e80f8: 74 04 je ffffffff814e80fe <tcp_fragment+0x24e> ffffffff814e80fa: 0f 0b ud2a ffffffff814e80fc: eb fe jmp ffffffff814e80fc <tcp_fragment+0x24c> ffffffff814e80fe: 83 c8 10 or $0x10,%eax ffffffff814e8101: 88 45 7c mov %al,0x7c(%rbp) ffffffff814e8104: 8b 85 b4 00 00 00 mov 0xb4(%rbp),%eax ffffffff814e810a: 48 03 85 b8 00 00 00 add 0xb8(%rbp),%rax ffffffff814e8111: f0 81 40 28 00 00 01 lock addl $0x10000,0x28(%rax) ffffffff814e8118: 00 ffffffff814e8119: 48 8b 03 mov (%rbx),%rax ffffffff814e811c: 48 89 5d 08 mov %rbx,0x8(%rbp) ffffffff814e8120: 48 89 45 00 mov %rax,0x0(%rbp) ffffffff814e8124: 48 89 68 08 mov %rbp,0x8(%rax) ffffffff814e8128: 48 89 2b mov %rbp,(%rbx) ffffffff814e812b: 31 c0 xor %eax,%eax ffffffff814e812d: 41 ff 87 10 01 00 00 incl 0x110(%r15) ffffffff814e8134: eb 05 jmp ffffffff814e813b <tcp_fragment+0x28b> ffffffff814e8136: b8 f4 ff ff ff mov $0xfffffff4,%eax ffffffff814e813b: 48 83 c4 18 add $0x18,%rsp ffffffff814e813f: 5b pop %rbx ffffffff814e8140: 5d pop %rbp ffffffff814e8141: 41 5c pop %r12 ffffffff814e8143: 41 5d pop %r13 ffffffff814e8145: 41 5e pop %r14 ffffffff814e8147: 41 5f pop %r15 ffffffff814e8149: c3 retq -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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