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SubjectIPF Montvale machine panic when running a network-relevent testing
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With kernel 2.6.26-rc5 and a git kernel just between rc4 and rc5, my
kernel panic on my Montvale machine when I did an initial specweb2005
testing between 2 machines.

Below is the log.

LOGIN: Unable to handle kernel NULL pointer dereference (address 0000000000000000)
Thread-7266[13494]: Oops 8804682956800 [1]
Modules linked in:
Pid: 13494, CPU 0, comm: Thread-7266
psr : 0000101008026018 ifs : 800000000000050e ip : [<a00000010087a4b0>] Not tainted (2.6.26-rc4git)
ip is at tcp_rcv_established+0x1450/0x16e0
unat: 0000000000000000 pfs : 000000000000050e rsc : 0000000000000003
rnat: 0000000000000000 bsps: 0000000000000000 pr : 000000000059656b
ldrs: 0000000000000000 ccv : 0000000000000000 fpsr: 0009804c8a70033f
csd : 0000000000000000 ssd : 0000000000000000
b0 : a00000010087a410 b6 : a0000001004c7ac0 b7 : a0000001004c64e0
f6 : 000000000000000000000 f7 : 1003e0000000000000b80
f8 : 10000821f080500000000 f9 : 1003efffffffffffffa58
f10 : 1003edbb7db5f6be58df8 f11 : 1003e0000000000000015
r1 : a0000001010cce90 r2 : e0000003d4530c40 r3 : 0000000000000105
r8 : e000000402533d68 r9 : e000000402533a80 r10 : e000000402533bfc
r11 : 0000000000000004 r12 : e0000003d4537df0 r13 : e0000003d4530000
r14 : 0000000000000000 r15 : e000000401fca180 r16 : e0000003d4530c68
r17 : e000000402572238 r18 : 00000000000000ff r19 : a0000001012c6630
r20 : e0000003d4530c68 r21 : e000000401fca480 r22 : e000000402572658
r23 : e000000402572240 r24 : a0000001012c4e04 r25 : 0000000000000003
r26 : e000000401fca4a8 r27 : e000000402572660 r28 : e00000040a2d2a00
r29 : e00000040a6f83a8 r30 : e00000040a6f8300 r31 : 000000000000000a
Call Trace:
[<a000000100014de0>] show_stack+0x40/0xa0
sp=e0000003d45379c0 bsp=e0000003d4531440
[<a0000001000156f0>] show_regs+0x850/0x8a0
sp=e0000003d4537b90 bsp=e0000003d45313e0
[<a000000100038d10>] die+0x230/0x360
sp=e0000003d4537b90 bsp=e0000003d4531398
[<a00000010005cec0>] ia64_do_page_fault+0x8e0/0xa40
sp=e0000003d4537b90 bsp=e0000003d4531348
[<a00000010000b120>] ia64_leave_kernel+0x0/0x280
sp=e0000003d4537c20 bsp=e0000003d4531348
[<a00000010087a4b0>] tcp_rcv_established+0x1450/0x16e0
sp=e0000003d4537df0 bsp=e0000003d45312d8
[<a000000100888370>] tcp_v4_do_rcv+0x70/0x500
sp=e0000003d4537df0 bsp=e0000003d4531298
[<a00000010088cd30>] tcp_v4_rcv+0xfb0/0x1060
sp=e0000003d4537e00 bsp=e0000003d4531248


As a matter of fact, kernel paniced at statement
"queue->rskq_accept_tail->dl_next = req" in function reqsk_queue_add, because
queue->rskq_accept_tail is NULL. The call chain is:
tcp_rcv_established => inet_csk_reqsk_queue_add => reqsk_queue_add.

As I was running an initial specweb2005(configured 3500 sessions) testing between
2 machines, there were lots of failure and many network connections were
reestablished during the testing.

In function tcp_v4_rcv, bh_lock_sock_nested(sk) (a kind of spinlock) is used to
avoid race. But inet_csk_accept uses lock_sock(sk) (a kind of sleeper). Although
lock_sock also accesses sk->sk_lock.slock, it looks like there is a race.

-yanmin


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