[Xen-devel] panic in e100_exec_cb()

["Charles Coffing" <ccoffing@xxxxxxxxxx>]

With today's build, my domain 0 crashes during boot when it tries to
bring eth0 up (it's an E100).

cb->prev (eax) is NULL in e100_exec_cb() (e100.c:827).  Just from code
inspection, I don't see how this can be.  e100_alloc_cbs() was just
called, which looks like it should have correctly linked up all the
cb->prev/cb->next pointers.

It happens regardless of CONFIG_XEN_WRITABLE_PAGETABLES.

Has anyone else seen this?


e100: eth0: e100_watchdog: link up, 100Mbps, full-duplex
Unable to handle kernel NULL pointer dereference at virtual address
00000002
 printing eip:
c022d6d2
*pde = ma 00000000 pa 55555000
 [<c022ea3a>] e100_alloc_cbs+0x74/0x140
 [<c022f5bb>] e100_up+0x39/0x1d6
 [<c0127f8b>] queue_delayed_work+0x50/0x6d
 [<c02307b3>] e100_open+0x23/0x69
 [<c031198b>] dev_open+0x8a/0xe6
 [<c0312e6e>] dev_change_flags+0x51/0x11f
 [<c03479d6>] devinet_ioctl+0x4f1/0x5b2
 [<c03496b9>] inet_ioctl+0x7e/0xa8
 [<c030a026>] sock_ioctl+0x184/0x25d
 [<c015c4e6>] sys_ioctl+0x16f/0x211
 [<c010d1b7>] syscall_call+0x7/0xb
Oops: 0002 [#1]
Modules linked in:
CPU:    0
EIP:    0061:[<c022d6d2>]    Not tainted
EFLAGS: 00013202   (2.6.8.1-xen0)
EIP is at e100_hw_init+0x19c/0x6e3
eax: 00000000   ebx: c66c8000   ecx: 00000005   edx: c7c19220
esi: c7c19220   edi: 0000003f   ebp: 00000000   esp: c73cfe40
ds: 0069   es: 0069   ss: 0069
Process ip (pid: 1708, threadinfo=c73ce000 task=c745a680)
Stack: c7c19220 c66c8000 00000000 00000040 c7c19220 00000000 c022ea3a
c1199844
       00006700 c7c19484 00000000 00000000 00000000 c7c19220 c7c19220
00000000
       c022f5bb c7c19220 c7fee260 0000004f c0127f8b c03f6698 c7c19000
00000000
Call Trace:
 [<c022ea3a>] e100_alloc_cbs+0x74/0x140
 [<c022f5bb>] e100_up+0x39/0x1d6
 [<c0127f8b>] queue_delayed_work+0x50/0x6d
 [<c02307b3>] e100_open+0x23/0x69
 [<c031198b>] dev_open+0x8a/0xe6
 [<c0312e6e>] dev_change_flags+0x51/0x11f
 [<c03479d6>] devinet_ioctl+0x4f1/0x5b2
 [<c03496b9>] inet_ioctl+0x7e/0xa8
 [<c030a026>] sock_ioctl+0x184/0x25d
 [<c015c4e6>] sys_ioctl+0x16f/0x211
 [<c010d1b7>] syscall_call+0x7/0xb
Code: 66 81 60 02 ff bf 8b 86 14 01 00 00 3b 86 10 01 00 00 3e 75



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