[Xen-devel] vmalloc_sync_all crash still happening on some machines

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

See the crash below, which happened on one of my test machines which
still aren't in the test pool due to these kind of failures.

The bug happened immediately after localhost migration of a pv guest.

The kernel was 2.6.32.46 (as built in flight 10515).

Ian.

Dec 16 19:02:13.085286 [  391.370426] ------------[ cut here ]------------^M
Dec 16 19:02:13.097267 [  391.370440] kernel BUG at arch/x86/mm/fault.c:210!^M
Dec 16 19:02:13.097303 [  391.370460] invalid opcode: 0000 [#1] SMP ^M
Dec 16 19:02:13.109253 [  391.370491] last sysfs file: 
/sys/devices/vif-9-0/uevent^M
Dec 16 19:02:13.109291 [  391.370503] Modules linked in: e1000e [last unloaded: 
scsi_wait_scan]^M
Dec 16 19:02:13.117292 [  391.370575] ^M
Dec 16 19:02:13.117330 [  391.370597] Pid: 40, comm: xenwatch Not tainted 
(2.6.32.46 #1) X9SCL/X9SCM^M
Dec 16 19:02:13.129252 [  391.370613] EIP: 0061:[<c104a052>] EFLAGS: 00010082 
CPU: 5^M
Dec 16 19:02:13.129289 [  391.370633] EIP is at vmalloc_sync_one+0x112/0x121^M
Dec 16 19:02:13.137260 [  391.370646] EAX: 000050a0 EBX: c1810fd0 ECX: fffff2e3 
EDX: 00000000^M
Dec 16 19:02:13.149240 [  391.370661] ESI: ffffffe0 EDI: d9248fff EBP: dfda7ea8 
ESP: dfda7e94^M
Dec 16 19:02:13.149279 [  391.370677]  DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 
0069^M
Dec 16 19:02:13.157316 [  391.370690] Process xenwatch (pid: 40, ti=dfda6000 
task=dfce3cc0 task.ti=dfda6000)^M
Dec 16 19:02:13.169240 [  391.370705] Stack:^M
Dec 16 19:02:13.169267 [  391.370716]  00285067 00000000 c5c68640 ff400000 
c1810fc8 dfda7ec4 c104aa52 c1760204^M
Dec 16 19:02:13.177285 [  391.370783] <0> c4be6f84 d7411320 df68bb40 dbc2b600 
dfda7ed0 c10da2f9 fffffff4 dfda7f28^M
Dec 16 19:02:13.177352 [  391.370858] <0> c122c1f3 0000032a 00000300 df68bb40 
0200006b dce9d3a8 400002c0 c102c23b^M
Dec 16 19:02:13.189265 [  391.370940] Call Trace:^M
Dec 16 19:02:13.189298 [  391.370960]  [<c104aa52>] ? 
vmalloc_sync_all+0x5f/0xc1^M
Dec 16 19:02:13.197260 [  391.370982]  [<c10da2f9>] ? alloc_vm_area+0x44/0x4b^M
Dec 16 19:02:13.197296 [  391.371004]  [<c122c1f3>] ? netif_map+0x45/0x24d^M
Dec 16 19:02:13.209317 [  391.371033]  [<c102c23b>] ? 
xen_restore_fl_direct_end+0x0/0x1^M
Dec 16 19:02:13.209352 [  391.371065]  [<c10e40b8>] ? kfree+0xff/0x107^M
Dec 16 19:02:13.217261 [  391.371097]  [<c121e974>] ? xenbus_scanf+0x35/0x48^M
Dec 16 19:02:13.217297 [  391.371118]  [<c122b8b8>] ? 
frontend_changed+0x2a2/0x4f0^M
Dec 16 19:02:13.229254 [  391.371137]  [<c121f331>] ? 
xenbus_otherend_changed+0x5c/0x61^M
Dec 16 19:02:13.237246 [  391.371158]  [<c121f6ff>] ? frontend_changed+0xa/0xd^M
Dec 16 19:02:13.237283 [  391.371178]  [<c121e00c>] ? 
xenwatch_thread+0xfe/0x126^M
Dec 16 19:02:13.245274 [  391.371199]  [<c1076589>] ? 
autoremove_wake_function+0x0/0x2f^M
Dec 16 19:02:13.245317 [  391.371223]  [<c121df0e>] ? 
xenwatch_thread+0x0/0x126^M
Dec 16 19:02:13.257249 [  391.371244]  [<c107626f>] ? kthread+0x5f/0x64^M
Dec 16 19:02:13.257283 [  391.371261]  [<c1076210>] ? kthread+0x0/0x64^M
Dec 16 19:02:13.265277 [  391.371283]  [<c102f497>] ? 
kernel_thread_helper+0x7/0x10^M
Dec 16 19:02:13.265318 [  391.371297] Code: eb fe ff 15 08 dd 66 c1 8b 7d ec 89 
ce 89 45 ec 8b 45 ec 89 55 f0 8b 55 f0 0f ac fe 0c c1 e6 05 0f ac d0 0c c1 e0 
05 39 c6 74 06 <0f> 0b eb fe 31 db 5a 89 d8 59 5b 5e 5f 5d c3 55 89 e5 53 89 c3 
^M
Dec 16 19:02:13.285270 [  391.371792] EIP: [<c104a052>] 
vmalloc_sync_one+0x112/0x121 SS:ESP 0069:dfda7e94^M
Dec 16 19:02:13.293255 [  391.371833] ---[ end trace 27f82c4d856810c0 ]---^M

10520/test-amd64-i386-xl

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