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Subject[lockup] 2.6.17-rc3: netfilter/sctp: lockup in sctp_new(), do_basic_checks()
running an "isic" stresstest on and against a testbox [which, amongst 
other things, generates random incoming and outgoing packets] on
2.6.17-rc3 (and 2.6.17-rc3-mm1) over gigabit results in a reproducible
lockup, after 5-10 minutes of runtime:

BUG: soft lockup detected on CPU#0!
[<c0104e7f>] show_trace+0xd/0xf
[<c0104e96>] dump_stack+0x15/0x17
[<c015ad02>] softlockup_tick+0xc5/0xd9
[<c0134c02>] run_local_timers+0x22/0x24
[<c0134fb7>] update_process_times+0x40/0x65
[<c011aa56>] smp_apic_timer_interrupt+0x58/0x60
[<c010492b>] apic_timer_interrupt+0x27/0x2c
[<c0f00df9>] sctp_new+0x8b/0x235
[<c0ef9666>] ip_conntrack_in+0x175/0x4ca
[<c0eb6dd7>] nf_iterate+0x31/0x94
[<c0eb6e83>] nf_hook_slow+0x49/0xda
[<c0ec2f55>] ip_rcv+0x24c/0x567
[<c0e7dec4>] netif_receive_skb+0x34b/0x397
[<c07870cb>] rtl8139_poll+0x3d8/0x5db
[<c0e7c7ad>] net_rx_action+0x9b/0x1ba
[<c0131955>] __do_softirq+0x6e/0xec
[<c0106187>] do_softirq+0x59/0xcd
[<c0131427>] local_bh_enable+0x111/0x15d
[<c0e7d8fb>] dev_queue_xmit+0x218/0x222
[<c0ec7e2a>] ip_output+0x20b/0x249
[<c0ec5711>] ip_push_pending_frames+0x331/0x3fe
[<c0ede6e3>] raw_sendmsg+0x5cf/0x678
[<c0ee62f8>] inet_sendmsg+0x39/0x46
[<c0e7406f>] sock_sendmsg+0xf2/0x10d
[<c0e741e5>] sys_sendmsg+0x15b/0x1c9
[<c0e748b5>] sys_socketcall+0x16f/0x18a
[<c1048c1b>] syscall_call+0x7/0xb

this is with FRAME_POINTERS enabled, so it's an exact stacktrace.

the lockup is at:

(gdb) list *0xc0f00df9
0xc0f00df9 is in sctp_new
440 sh = skb_header_pointer(skb, iph->ihl * 4, sizeof(_sctph), &_sctph);
441 if (sh == NULL)
442 return 0;
444 if (do_basic_checks(conntrack, skb, map) != 0)
445 return 0;
447 /* If an OOTB packet has any of these chunks discard (Sec 8.4) */
448 if ((test_bit (SCTP_CID_ABORT, (void *)map))

most likely somewhere within do_basic_checks(). [whose stack entry is
obscured by the irq entry, so it's not in the stackdump.] I have SCTP
turned on:

# SCTP Configuration (EXPERIMENTAL)

but otherwise it's a stock Fedora install.

the full log and configs can be found at:

this is a v2.6.17 showstopper i guess?

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