Bug 99161
| Summary: | 2.6.32.66 PPC Oops in tcp_send_fin | ||
|---|---|---|---|
| Product: | Networking | Reporter: | varenet |
| Component: | IPV4 | Assignee: | Stephen Hemminger (stephen) |
| Status: | NEW --- | ||
| Severity: | normal | CC: | kdevel, szg00000 |
| Priority: | P1 | ||
| Hardware: | PPC-32 | ||
| OS: | Linux | ||
| Kernel Version: | 2.6.32.66 | Subsystem: | |
| Regression: | No | Bisected commit-id: | |
| Attachments: | fix | ||
Can confirm this bug here on IA-32. It seems that there is an issue with the backport commit f944afb246e7b8edd6196984e21764eeda5446d3 Author: Eric Dumazet <edumazet@google.com> Date: Thu Apr 23 10:42:39 2015 -0700 tcp: avoid looping in tcp_send_fin() [ Upstream commit 845704a535e9b3c76448f52af1b70e4422ea03fd ] skb is used uninitialized In line 2139: tcp_output.c: 2127 void tcp_send_fin(struct sock *sk) 2128 { 2129 struct sk_buff *skb, *tskb = tcp_write_queue_tail(sk); 2130 struct tcp_sock *tp = tcp_sk(sk); 2131 2132 /* Optimization, tack on the FIN if we have one skb in write queue an d 2133 * this skb was not yet sent, or we are under memory pressure. 2134 * Note: in the latter case, FIN packet will be sent after a timeout, 2135 * as TCP stack thinks it has already been transmitted. 2136 */ 2137 if (tskb && (tcp_send_head(sk) || tcp_memory_pressure)) { 2138 coalesce: 2139 TCP_SKB_CB(skb)->flags |= TCPCB_FLAG_FIN; 2140 TCP_SKB_CB(tskb)->end_seq++; Compare this to the backport to 3.2.68 where in line 2338 tskb is used instead of skb tcp_output.c: 2326 void tcp_send_fin(struct sock *sk) 2327 { 2328 struct sk_buff *skb, *tskb = tcp_write_queue_tail(sk); 2329 struct tcp_sock *tp = tcp_sk(sk); 2330 2331 /* Optimization, tack on the FIN if we have one skb in write queue an d 2332 * this skb was not yet sent, or we are under memory pressure. 2333 * Note: in the latter case, FIN packet will be sent after a timeout, 2334 * as TCP stack thinks it has already been transmitted. 2335 */ 2336 if (tskb && (tcp_send_head(sk) || tcp_memory_pressure)) { 2337 coalesce: 2338 TCP_SKB_CB(tskb)->tcp_flags |= TCPHDR_FIN; 2339 TCP_SKB_CB(tskb)->end_seq++; s/backport to 3.2.68/backport in 3.2.69/ Created attachment 178341 [details]
fix
|
I just updated my trusty old PPC box to longterm 2.6.32.66 (was running .65 before that with zero issue) and it started spewing oopses at me like hell broke loose. This machine is primarily used as a DNS and MX (albeit under low pressure). Unable to handle kernel paging request for data at address 0x0000003c Faulting instruction address: 0xc0344ffc Oops: Kernel access of bad area, sig: 11 [#1] PowerMac Modules linked in: sch_sfq cls_u32 sch_cbq xt_recent xt_length iptable_mangle NIP: c0344ffc LR: c0335b00 CTR: c03357b0 REGS: cb441dd0 TRAP: 0300 Not tainted (2.6.32.66) MSR: 00009032 <EE,ME,IR,DR> CR: 44244488 XER: 00000000 DAR: 0000003c, DSISR: 40000000 TASK = e39f0900[14281] 'smtpd' THREAD: cb440000 GPR00: dbc00000 cb441e80 e39f0900 e397cc60 00000004 e3948100 00000003 00000000 GPR08: 00000000 00000020 01afffff ffffffe4 24244482 207bb198 201322b4 2065d898 GPR16: 2065d878 2065d7e0 2065d858 2065d7e0 2065d7e0 206733b0 20673060 bfcc7f50 GPR24: bfcc7f40 20b7eeb0 bfcc7f40 00000000 00000000 e397ccc4 dbc00020 e397cc60 NIP [c0344ffc] tcp_send_fin+0x48/0x21c LR [c0335b00] tcp_close+0x350/0x3fc Call Trace: [cb441e80] [cb441e84] 0xcb441e84 (unreliable) [cb441ea0] [c0335b00] tcp_close+0x350/0x3fc [cb441ec0] [c035733c] inet_release+0x58/0x88 [cb441ed0] [c02e1fe8] sock_release+0x34/0xa8 [cb441ee0] [c02e2078] sock_close+0x1c/0x40 [cb441ef0] [c009cddc] __fput+0xf4/0x22c [cb441f10] [c0098ea4] filp_close+0x64/0xa0 [cb441f30] [c0098f7c] sys_close+0x9c/0xc0 [cb441f40] [c0012988] ret_from_syscall+0x0/0x38 --- Exception: c01 at 0x20368780 LR = 0x2064bc48 Instruction dump: 90010024 93c10018 83dd0004 7f9df000 419e0080 2f9e0000 419e007c 80030104 2f800000 419e0180 39200020 3bde0020 <8809001c> 60000001 9809001c 813e0014 ---[ end trace 13772745934a0d1f ]--- Unable to handle kernel paging request for data at address 0x0000003c Faulting instruction address: 0xc0344ffc Oops: Kernel access of bad area, sig: 11 [#2] PowerMac Modules linked in: sch_sfq cls_u32 sch_cbq xt_recent xt_length iptable_mangle NIP: c0344ffc LR: c0335b00 CTR: c03357b0 REGS: dbc09d60 TRAP: 0300 Tainted: G D (2.6.32.66) MSR: 00009032 <EE,ME,IR,DR> CR: 42004288 XER: 20000000 DAR: 0000003c, DSISR: 40000000 TASK = e394f180[14867] 'imapd' THREAD: dbc08000 GPR00: dbc00d80 dbc09e10 e394f180 e397c420 00000009 ef10eb80 00000003 00000000 GPR08: 00000000 00000020 00000000 e397c498 22004282 1002bad4 1023e7b0 10020000 GPR16: 10020000 10020000 10020000 10020000 10007678 1000766c 00000008 1023d168 GPR24: 10020000 10018c28 00000000 00000000 00000000 e397c484 ef327c20 e397c420 NIP [c0344ffc] tcp_send_fin+0x48/0x21c LR [c0335b00] tcp_close+0x350/0x3fc Call Trace: [dbc09e10] [1000766c] 0x1000766c (unreliable) [dbc09e30] [c0335b00] tcp_close+0x350/0x3fc [dbc09e50] [c035733c] inet_release+0x58/0x88 [dbc09e60] [c02e1fe8] sock_release+0x34/0xa8 [dbc09e70] [c02e2078] sock_close+0x1c/0x40 [dbc09e80] [c009cddc] __fput+0xf4/0x22c [dbc09ea0] [c0098ea4] filp_close+0x64/0xa0 [dbc09ec0] [c00318e0] put_files_struct+0x108/0x124 [dbc09ee0] [c0033824] do_exit+0x4fc/0x630 [dbc09f20] [c003399c] do_group_exit+0x44/0xa4 [dbc09f30] [c0033a10] sys_exit_group+0x14/0x28 [dbc09f40] [c0012988] ret_from_syscall+0x0/0x38 --- Exception: c01 at 0xfd96f38 LR = 0xfd96f04 Instruction dump: 90010024 93c10018 83dd0004 7f9df000 419e0080 2f9e0000 419e007c 80030104 2f800000 419e0180 39200020 3bde0020 <8809001c> 60000001 9809001c 813e0014 ---[ end trace 13772745934a0d20 ]--- Fixing recursive fault but reboot is needed! Unable to handle kernel paging request for data at address 0x0000003c Faulting instruction address: 0xc0344ffc Oops: Kernel access of bad area, sig: 11 [#3] PowerMac Modules linked in: sch_sfq cls_u32 sch_cbq xt_recent xt_length iptable_mangle NIP: c0344ffc LR: c0335b00 CTR: c03357b0 REGS: cb463dd0 TRAP: 0300 Tainted: G D (2.6.32.66) MSR: 00009032 <EE,ME,IR,DR> CR: 44244488 XER: 00000000 DAR: 0000003c, DSISR: 40000000 TASK = e39f1f80[15093] 'smtpd' THREAD: cb462000 GPR00: dbc00480 cb463e80 e39f1f80 e397d4a0 00000004 e3878f80 00000003 00000000 GPR08: 00000000 00000020 01afffff ffffffd6 24244482 206eb198 200622b4 2058d898 GPR16: 2058d878 2058d7e0 2058d858 2058d7e0 2058d7e0 205a33b0 205a3060 bf900600 GPR24: bf9005f0 20b22eb0 bf9005f0 00000000 00000000 e397d504 dbc004a0 e397d4a0 NIP [c0344ffc] tcp_send_fin+0x48/0x21c LR [c0335b00] tcp_close+0x350/0x3fc Call Trace: [cb463e80] [cb463e84] 0xcb463e84 (unreliable) [cb463ea0] [c0335b00] tcp_close+0x350/0x3fc [cb463ec0] [c035733c] inet_release+0x58/0x88 [cb463ed0] [c02e1fe8] sock_release+0x34/0xa8 [cb463ee0] [c02e2078] sock_close+0x1c/0x40 [cb463ef0] [c009cddc] __fput+0xf4/0x22c [cb463f10] [c0098ea4] filp_close+0x64/0xa0 [cb463f30] [c0098f7c] sys_close+0x9c/0xc0 [cb463f40] [c0012988] ret_from_syscall+0x0/0x38 --- Exception: c01 at 0x20298780 LR = 0x2057bc48 Instruction dump: 90010024 93c10018 83dd0004 7f9df000 419e0080 2f9e0000 419e007c 80030104 2f800000 419e0180 39200020 3bde0020 <8809001c> 60000001 9809001c 813e0014 ---[ end trace 13772745934a0d21 ]--- Unable to handle kernel paging request for data at address 0x0000003c Faulting instruction address: 0xc0344ffc Oops: Kernel access of bad area, sig: 11 [#4] PowerMac Modules linked in: sch_sfq cls_u32 sch_cbq xt_recent xt_length iptable_mangle NIP: c0344ffc LR: c0335b00 CTR: c03357b0 REGS: cc6a3dd0 TRAP: 0300 Tainted: G D (2.6.32.66) MSR: 00009032 <EE,ME,IR,DR> CR: 44244488 XER: 00000000 DAR: 0000003c, DSISR: 40000000 TASK = ef3c6400[16550] 'smtpd' THREAD: cc6a2000 GPR00: e38ce900 cc6a3e80 ef3c6400 ef33f180 00000004 e3881b00 00000003 00000000 GPR08: 00000000 00000020 002fffff ffffffcf 24244482 2036b198 1fce22b4 2020d898 GPR16: 2020d878 2020d7e0 2020d858 2020d7e0 2020d7e0 202233b0 20223060 bfde05a0 GPR24: bfde0590 20965eb0 bfde0590 00000000 00000000 ef33f1e4 e38ce920 ef33f180 NIP [c0344ffc] tcp_send_fin+0x48/0x21c LR [c0335b00] tcp_close+0x350/0x3fc Call Trace: [cc6a3e80] [cc6a3e84] 0xcc6a3e84 (unreliable) [cc6a3ea0] [c0335b00] tcp_close+0x350/0x3fc [cc6a3ec0] [c035733c] inet_release+0x58/0x88 [cc6a3ed0] [c02e1fe8] sock_release+0x34/0xa8 [cc6a3ee0] [c02e2078] sock_close+0x1c/0x40 [cc6a3ef0] [c009cddc] __fput+0xf4/0x22c [cc6a3f10] [c0098ea4] filp_close+0x64/0xa0 [cc6a3f30] [c0098f7c] sys_close+0x9c/0xc0 [cc6a3f40] [c0012988] ret_from_syscall+0x0/0x38 --- Exception: c01 at 0x1ff18780 LR = 0x201fbc48 Instruction dump: 90010024 93c10018 83dd0004 7f9df000 419e0080 2f9e0000 419e007c 80030104 2f800000 419e0180 39200020 3bde0020 <8809001c> 60000001 9809001c 813e0014 ---[ end trace 13772745934a0d22 ]--- Unable to handle kernel paging request for data at address 0x0000003c Faulting instruction address: 0xc0344ffc Oops: Kernel access of bad area, sig: 11 [#5] PowerMac Modules linked in: sch_sfq cls_u32 sch_cbq xt_recent xt_length iptable_mangle NIP: c0344ffc LR: c0335b00 CTR: c03357b0 REGS: cb453dd0 TRAP: 0300 Tainted: G D (2.6.32.66) MSR: 00009032 <EE,ME,IR,DR> CR: 44244488 XER: 20000000 DAR: 0000003c, DSISR: 40000000 TASK = ef3c6400[21740] 'smtpd' THREAD: cb452000 GPR00: cb614600 cb453e80 ef3c6400 e397e100 00000009 e3a24d00 00000003 00000000 GPR08: 00000000 00000020 01afffff e397e178 24244482 2066c198 1ffe32b4 2050e898 GPR16: 2050e878 2050e7e0 2050e858 2050e7e0 2050e7e0 205243b0 20524060 bfa601a0 GPR24: bfa60190 2089feb0 bfa60190 00000000 00000000 e397e164 cb614620 e397e100 NIP [c0344ffc] tcp_send_fin+0x48/0x21c LR [c0335b00] tcp_close+0x350/0x3fc Call Trace: [cb453e80] [00000004] 0x4 (unreliable) [cb453ea0] [c0335b00] tcp_close+0x350/0x3fc [cb453ec0] [c035733c] inet_release+0x58/0x88 [cb453ed0] [c02e1fe8] sock_release+0x34/0xa8 [cb453ee0] [c02e2078] sock_close+0x1c/0x40 [cb453ef0] [c009cddc] __fput+0xf4/0x22c [cb453f10] [c0098ea4] filp_close+0x64/0xa0 [cb453f30] [c0098f7c] sys_close+0x9c/0xc0 [cb453f40] [c0012988] ret_from_syscall+0x0/0x38 --- Exception: c01 at 0x20219780 LR = 0x204fcc48 Instruction dump: 90010024 93c10018 83dd0004 7f9df000 419e0080 2f9e0000 419e007c 80030104 2f800000 419e0180 39200020 3bde0020 <8809001c> 60000001 9809001c 813e0014 ---[ end trace 13772745934a0d23 ]--- Unable to handle kernel paging request for data at address 0x0000003c Faulting instruction address: 0xc0344ffc Oops: Kernel access of bad area, sig: 11 [#6] PowerMac Modules linked in: sch_sfq cls_u32 sch_cbq xt_recent xt_length iptable_mangle NIP: c0344ffc LR: c0335b00 CTR: c02e2bfc REGS: cb6b3dd0 TRAP: 0300 Tainted: G D (2.6.32.66) MSR: 00009032 <EE,ME,IR,DR> CR: 44244488 XER: 20000000 DAR: 0000003c, DSISR: 40000000 TASK = ef3c6d00[23828] 'smtpd' THREAD: cb6b2000 GPR00: cb661300 cb6b3e80 ef3c6d00 cb698c60 00000009 e380b180 c02e9058 00000000 GPR08: cb698cb8 00000020 00000000 cb698cd8 24244482 2026d198 1fbe42b4 2010f898 GPR16: 2010f878 2010f7e0 2010f858 2010f7e0 2010f7e0 201253b0 20125060 bf879000 GPR24: bf878ff0 20625eb0 bf878ff0 00000000 00000000 cb698cc4 cb661320 cb698c60 NIP [c0344ffc] tcp_send_fin+0x48/0x21c LR [c0335b00] tcp_close+0x350/0x3fc Call Trace: [cb6b3e80] [c0097398] kmem_cache_free+0x90/0x9c (unreliable) [cb6b3ea0] [c0335b00] tcp_close+0x350/0x3fc [cb6b3ec0] [c035733c] inet_release+0x58/0x88 [cb6b3ed0] [c02e1fe8] sock_release+0x34/0xa8 [cb6b3ee0] [c02e2078] sock_close+0x1c/0x40 [cb6b3ef0] [c009cddc] __fput+0xf4/0x22c [cb6b3f10] [c0098ea4] filp_close+0x64/0xa0 [cb6b3f30] [c0098f7c] sys_close+0x9c/0xc0 [cb6b3f40] [c0012988] ret_from_syscall+0x0/0x38 --- Exception: c01 at 0x1fe1a780 LR = 0x200fdc48 Instruction dump: 90010024 93c10018 83dd0004 7f9df000 419e0080 2f9e0000 419e007c 80030104 2f800000 419e0180 39200020 3bde0020 <8809001c> 60000001 9809001c 813e0014 ---[ end trace 13772745934a0d24 ]--- Unable to handle kernel paging request for data at address 0x0000003c Faulting instruction address: 0xc0344ffc Oops: Kernel access of bad area, sig: 11 [#7] PowerMac Modules linked in: sch_sfq cls_u32 sch_cbq xt_recent xt_length iptable_mangle NIP: c0344ffc LR: c0335b00 CTR: c03357b0 REGS: cb617d60 TRAP: 0300 Tainted: G D (2.6.32.66) MSR: 00009032 <EE,ME,IR,DR> CR: 42004288 XER: 20000000 DAR: 0000003c, DSISR: 40000000 TASK = ef3c4000[1947] 'ipop3d' THREAD: cb616000 GPR00: cb696600 cb617e10 ef3c4000 cb698000 00000009 ef29f800 00000003 00000000 GPR08: 00000000 00000020 00000000 cb698078 22004282 1001de08 10015e48 10015e54 GPR16: 10015e48 55665804 100054bc 10015e1c 10015e0c 10005330 10015e10 00000003 GPR24: 10015e18 10005310 00000000 00000000 00000000 cb698064 cb696620 cb698000 NIP [c0344ffc] tcp_send_fin+0x48/0x21c LR [c0335b00] tcp_close+0x350/0x3fc Call Trace: [cb617e10] [10005330] 0x10005330 (unreliable) [cb617e30] [c0335b00] tcp_close+0x350/0x3fc [cb617e50] [c035733c] inet_release+0x58/0x88 [cb617e60] [c02e1fe8] sock_release+0x34/0xa8 [cb617e70] [c02e2078] sock_close+0x1c/0x40 [cb617e80] [c009cddc] __fput+0xf4/0x22c [cb617ea0] [c0098ea4] filp_close+0x64/0xa0 [cb617ec0] [c00318e0] put_files_struct+0x108/0x124 [cb617ee0] [c0033824] do_exit+0x4fc/0x630 [cb617f20] [c003399c] do_group_exit+0x44/0xa4 [cb617f30] [c0033a10] sys_exit_group+0x14/0x28 [cb617f40] [c0012988] ret_from_syscall+0x0/0x38 --- Exception: c01 at 0xfd96f38 LR = 0xfd96f04 Instruction dump: 90010024 93c10018 83dd0004 7f9df000 419e0080 2f9e0000 419e007c 80030104 2f800000 419e0180 39200020 3bde0020 <8809001c> 60000001 9809001c 813e0014 ---[ end trace 13772745934a0d25 ]--- Fixing recursive fault but reboot is needed! Unable to handle kernel paging request for data at address 0x0000003c Faulting instruction address: 0xc0344ffc Oops: Kernel access of bad area, sig: 11 [#8] PowerMac Modules linked in: sch_sfq cls_u32 sch_cbq xt_recent xt_length iptable_mangle NIP: c0344ffc LR: c0335b00 CTR: c03357b0 REGS: cb471d60 TRAP: 0300 Tainted: G D (2.6.32.66) MSR: 00009032 <EE,ME,IR,DR> CR: 42004288 XER: 20000000 DAR: 0000003c, DSISR: 40000000 TASK = ef3c7a80[1949] 'ipop3d' THREAD: cb470000 GPR00: cb696900 cb471e10 ef3c7a80 cb69a100 00000009 e391c080 00000003 00000000 GPR08: 00000000 00000020 00000000 cb69a178 22004282 1001de08 10015e48 10015e54 GPR16: 10015e48 55665805 100054bc 10015e1c 10015e0c 10005330 10015e10 00000003 GPR24: 10015e18 10005310 00000000 00000000 00000000 cb69a164 cb696920 cb69a100 NIP [c0344ffc] tcp_send_fin+0x48/0x21c LR [c0335b00] tcp_close+0x350/0x3fc Call Trace: [cb471e10] [10005330] 0x10005330 (unreliable) [cb471e30] [c0335b00] tcp_close+0x350/0x3fc [cb471e50] [c035733c] inet_release+0x58/0x88 [cb471e60] [c02e1fe8] sock_release+0x34/0xa8 [cb471e70] [c02e2078] sock_close+0x1c/0x40 [cb471e80] [c009cddc] __fput+0xf4/0x22c [cb471ea0] [c0098ea4] filp_close+0x64/0xa0 [cb471ec0] [c00318e0] put_files_struct+0x108/0x124 [cb471ee0] [c0033824] do_exit+0x4fc/0x630 [cb471f20] [c003399c] do_group_exit+0x44/0xa4 [cb471f30] [c0033a10] sys_exit_group+0x14/0x28 [cb471f40] [c0012988] ret_from_syscall+0x0/0x38 --- Exception: c01 at 0xfd96f38 LR = 0xfd96f04 Instruction dump: 90010024 93c10018 83dd0004 7f9df000 419e0080 2f9e0000 419e007c 80030104 2f800000 419e0180 39200020 3bde0020 <8809001c> 60000001 9809001c 813e0014 ---[ end trace 13772745934a0d26 ]--- Fixing recursive fault but reboot is needed! Unable to handle kernel paging request for data at address 0x0000003c Faulting instruction address: 0xc0344ffc Oops: Kernel access of bad area, sig: 11 [#9] PowerMac Modules linked in: sch_sfq cls_u32 sch_cbq xt_recent xt_length iptable_mangle NIP: c0344ffc LR: c0335b00 CTR: c03357b0 REGS: cb497d60 TRAP: 0300 Tainted: G D (2.6.32.66) MSR: 00009032 <EE,ME,IR,DR> CR: 42004288 XER: 20000000 DAR: 0000003c, DSISR: 40000000 TASK = ef3c4d80[1951] 'ipop3d' THREAD: cb496000 GPR00: cb661c00 cb497e10 ef3c4d80 cb69a940 00000009 e3904880 00000003 00000000 GPR08: 00000000 00000020 00000000 cb69a9b8 22004282 1001de08 10015e48 10015e54 GPR16: 10015e48 55665807 100054bc 10015e1c 10015e0c 10005330 10015e10 00000003 GPR24: 10015e18 10005310 00000000 00000000 00000000 cb69a9a4 cb661c20 cb69a940 NIP [c0344ffc] tcp_send_fin+0x48/0x21c LR [c0335b00] tcp_close+0x350/0x3fc Call Trace: [cb497e10] [10005330] 0x10005330 (unreliable) [cb497e30] [c0335b00] tcp_close+0x350/0x3fc [cb497e50] [c035733c] inet_release+0x58/0x88 [cb497e60] [c02e1fe8] sock_release+0x34/0xa8 [cb497e70] [c02e2078] sock_close+0x1c/0x40 [cb497e80] [c009cddc] __fput+0xf4/0x22c [cb497ea0] [c0098ea4] filp_close+0x64/0xa0 [cb497ec0] [c00318e0] put_files_struct+0x108/0x124 [cb497ee0] [c0033824] do_exit+0x4fc/0x630 [cb497f20] [c003399c] do_group_exit+0x44/0xa4 [cb497f30] [c0033a10] sys_exit_group+0x14/0x28 [cb497f40] [c0012988] ret_from_syscall+0x0/0x38 --- Exception: c01 at 0xfd96f38 LR = 0xfd96f04 Instruction dump: 90010024 93c10018 83dd0004 7f9df000 419e0080 2f9e0000 419e007c 80030104 2f800000 419e0180 39200020 3bde0020 <8809001c> 60000001 9809001c 813e0014 ---[ end trace 13772745934a0d27 ]--- Fixing recursive fault but reboot is needed! Unable to handle kernel paging request for data at address 0x0000003c Faulting instruction address: 0xc0344ffc Oops: Kernel access of bad area, sig: 11 [#10] PowerMac Modules linked in: sch_sfq cls_u32 sch_cbq xt_recent xt_length iptable_mangle NIP: c0344ffc LR: c0335b00 CTR: c03357b0 REGS: e3b1fd60 TRAP: 0300 Tainted: G D (2.6.32.66) MSR: 00009032 <EE,ME,IR,DR> CR: 42004288 XER: 20000000 DAR: 0000003c, DSISR: 40000000 TASK = ef3c4900[1952] 'ipop3d' THREAD: e3b1e000 GPR00: cb661900 e3b1fe10 ef3c4900 cb69b5a0 00000009 e38f6280 00000003 00000000 GPR08: 00000000 00000020 00000000 cb69b618 22004282 1001de08 10015e48 10015e54 GPR16: 10015e48 55665808 100054bc 10015e1c 10015e0c 10005330 10015e10 00000003 GPR24: 10015e18 10005310 00000000 00000000 00000000 cb69b604 cb661920 cb69b5a0 NIP [c0344ffc] tcp_send_fin+0x48/0x21c LR [c0335b00] tcp_close+0x350/0x3fc Call Trace: [e3b1fe10] [10005330] 0x10005330 (unreliable) [e3b1fe30] [c0335b00] tcp_close+0x350/0x3fc [e3b1fe50] [c035733c] inet_release+0x58/0x88 [e3b1fe60] [c02e1fe8] sock_release+0x34/0xa8 [e3b1fe70] [c02e2078] sock_close+0x1c/0x40 [e3b1fe80] [c009cddc] __fput+0xf4/0x22c [e3b1fea0] [c0098ea4] filp_close+0x64/0xa0 [e3b1fec0] [c00318e0] put_files_struct+0x108/0x124 [e3b1fee0] [c0033824] do_exit+0x4fc/0x630 [e3b1ff20] [c003399c] do_group_exit+0x44/0xa4 [e3b1ff30] [c0033a10] sys_exit_group+0x14/0x28 [e3b1ff40] [c0012988] ret_from_syscall+0x0/0x38 --- Exception: c01 at 0xfd96f38 LR = 0xfd96f04 Instruction dump: 90010024 93c10018 83dd0004 7f9df000 419e0080 2f9e0000 419e007c 80030104 2f800000 419e0180 39200020 3bde0020 <8809001c> 60000001 9809001c 813e0014 ---[ end trace 13772745934a0d28 ]--- Fixing recursive fault but reboot is needed! Unable to handle kernel paging request for data at address 0x0000003c Faulting instruction address: 0xc0344ffc Oops: Kernel access of bad area, sig: 11 [#11] PowerMac Modules linked in: sch_sfq cls_u32 sch_cbq xt_recent xt_length iptable_mangle NIP: c0344ffc LR: c0335b00 CTR: c02e2bfc REGS: e3a47dd0 TRAP: 0300 Tainted: G D (2.6.32.66) MSR: 00009032 <EE,ME,IR,DR> CR: 44244488 XER: 20000000 DAR: 0000003c, DSISR: 40000000 TASK = e39f3a80[2290] 'smtpd' THREAD: e3a46000 GPR00: cb482600 e3a47e80 e39f3a80 cb69a520 00000009 ef242f00 c02e9058 00000000 GPR08: cb69a578 00000020 0000001b cb69a598 24244482 201cd198 1fb442b4 2006f898 GPR16: 2006f878 2006f7e0 2006f858 2006f7e0 2006f7e0 200853b0 20085060 bff82240 GPR24: bff82230 205bceb0 bff82230 00000000 00000000 cb69a584 cb482620 cb69a520 NIP [c0344ffc] tcp_send_fin+0x48/0x21c LR [c0335b00] tcp_close+0x350/0x3fc Call Trace: [e3a47e80] [c0097398] kmem_cache_free+0x90/0x9c (unreliable) [e3a47ea0] [c0335b00] tcp_close+0x350/0x3fc [e3a47ec0] [c035733c] inet_release+0x58/0x88 [e3a47ed0] [c02e1fe8] sock_release+0x34/0xa8 [e3a47ee0] [c02e2078] sock_close+0x1c/0x40 [e3a47ef0] [c009cddc] __fput+0xf4/0x22c [e3a47f10] [c0098ea4] filp_close+0x64/0xa0 [e3a47f30] [c0098f7c] sys_close+0x9c/0xc0 [e3a47f40] [c0012988] ret_from_syscall+0x0/0x38 --- Exception: c01 at 0x1fd7a780 LR = 0x2005dc48 Instruction dump: 90010024 93c10018 83dd0004 7f9df000 419e0080 2f9e0000 419e007c 80030104 2f800000 419e0180 39200020 3bde0020 <8809001c> 60000001 9809001c 813e0014 ---[ end trace 13772745934a0d29 ]--- Here's the disassembly of the beginning of tcp_send_fin, with the offending instruction: (gdb) disassemble tcp_send_fin Dump of assembler code for function tcp_send_fin: 0xc0344fb4 <tcp_send_fin+0>: stwu r1,-32(r1) 0xc0344fb8 <tcp_send_fin+4>: mflr r0 0xc0344fbc <tcp_send_fin+8>: stw r29,20(r1) 0xc0344fc0 <tcp_send_fin+12>: addi r29,r3,100 0xc0344fc4 <tcp_send_fin+16>: stw r31,28(r1) 0xc0344fc8 <tcp_send_fin+20>: mr r31,r3 0xc0344fcc <tcp_send_fin+24>: stw r0,36(r1) 0xc0344fd0 <tcp_send_fin+28>: stw r30,24(r1) 0xc0344fd4 <tcp_send_fin+32>: lwz r30,4(r29) 0xc0344fd8 <tcp_send_fin+36>: cmpw cr7,r29,r30 0xc0344fdc <tcp_send_fin+40>: beq cr7,0xc034505c <tcp_send_fin+168> 0xc0344fe0 <tcp_send_fin+44>: cmpwi cr7,r30,0 0xc0344fe4 <tcp_send_fin+48>: beq cr7,0xc0345060 <tcp_send_fin+172> 0xc0344fe8 <tcp_send_fin+52>: lwz r0,260(r3) 0xc0344fec <tcp_send_fin+56>: cmpwi cr7,r0,0 0xc0344ff0 <tcp_send_fin+60>: beq cr7,0xc0345170 <tcp_send_fin+444> 0xc0344ff4 <tcp_send_fin+64>: li r9,32 0xc0344ff8 <tcp_send_fin+68>: addi r30,r30,32 0xc0344ffc <tcp_send_fin+72>: lbz r0,28(r9) 0xc0345000 <tcp_send_fin+76>: ori r0,r0,1 0xc0345004 <tcp_send_fin+80>: stb r0,28(r9) 0xc0345008 <tcp_send_fin+84>: lwz r9,20(r30) 0xc034500c <tcp_send_fin+88>: addi r0,r9,1 0xc0345010 <tcp_send_fin+92>: stw r0,20(r30) HTH