I get the following crash when I try to start up a guest on a low memory
machine
BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [<c0632641>] balloon_process+0x3e5/0x596
*pdpt = 0000000000aac001 *pde = 0000000000000000
Oops: 0000 [#1] SMP
last sysfs file: /sys/devices/system/xen_memory/xen_memory0/info/current_kb
Modules linked in: nfs lockd fscache nfs_acl nf_conntrack_ftp bridge stp llc
autofs4 rpcsec_gss_krb5 auth_rpcgss des_generic sunrpc ip6table_filter
ip6_tables ipv6 xen_evtchn xenfs snd_intel8x0 snd_ac97_codec ac97_bus snd_seq
snd_seq_device ppdev snd_pcm parport_pc parport snd_timer e100 snd soundcore
mii iTCO_wdt snd_page_alloc i2c_i801 iTCO_vendor_support i915 drm_kms_helper
drm i2c_algo_bit i2c_core video output [last unloaded: scsi_wait_scan]
Pid: 6, comm: events/0 Not tainted (2.6.32.14-1.2.105.xendom0.fc12.i686.PAE #1)
EIP: 0061:[<c0632641>] EFLAGS: 00010046 CPU: 0
EIP is at balloon_process+0x3e5/0x596
EAX: c25f6000 EBX: 00000f02 ECX: c269e038 EDX: 00000000
ESI: 00000000 EDI: 00018f02 EBP: dc09df6c ESP: dc09df08
DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0069
Process events/0 (pid: 6, ti=dc09c000 task=dc083fc0 task.ti=dc09c000)
Stack:
dc09df38 dc09df4c c0ab0288 00000000 00000001 ffffb4d7 00000000 00018f02
00000f02 00000000 000003a9 00000000 c0407250 c2a10004 c2a19b04 c2a10004
c0407247 00000000 00000000 00000000 00000000 00007ff0 c2a1d460 c09db2dc
Call Trace:
[<c0407250>] ? check_events+0x8/0xc
[<c0407247>] ? xen_restore_fl_direct_end+0x0/0x1
[<c0458d11>] ? worker_thread+0x140/0x1b9
[<c063225c>] ? balloon_process+0x0/0x596
[<c045c79d>] ? autoremove_wake_function+0x0/0x34
[<c0458bd1>] ? worker_thread+0x0/0x1b9
[<c045c565>] ? kthread+0x64/0x69
[<c045c501>] ? kthread+0x0/0x69
[<c040ac07>] ? kernel_thread_helper+0x7/0x10
Code: ff 25 ff ff ff 7f 8b 55 c8 39 f8 89 04 95 e0 7e b6 c0 b8 01 00 00 00 0f 44 45 a8 83 ca ff 89 45 a8 89 d8 e8 ed 3f dd ff 8b 55 b4 <8b> 02 c1 e8 1e 69 c0 00 0b 00 00 05 80 13 9f c0 2b 80 ec 0a 00
EIP: [<c0632641>] balloon_process+0x3e5/0x596 SS:ESP 0069:dc09df08
CR2: 0000000000000000
The relevant address is
0xc0632641 <balloon_process+997>: mov (%edx),%eax
and the context is
0xc06325e1 <balloon_process+901>: mov (%eax),%edx
0xc06325e3 <balloon_process+903>: mov %edx,-0x44(%ebp)
0xc06325e6 <balloon_process+906>: mov -0x44(%ebp),%eax
0xc06325e9 <balloon_process+909>: shl $0x5,%eax
0xc06325ec <balloon_process+912>: add 0xc0b5c740,%eax
0xc06325f2 <balloon_process+918>: call 0xc06321e2 <balloon_append>
0xc06325f7 <balloon_process+923>: movl $0x0,-0x58(%ebp)
0xc06325fe <balloon_process+930>: movl $0x0,-0x38(%ebp)
0xc0632605 <balloon_process+937>:
jmp 0xc063267f <balloon_process+1059>
0xc0632607 <balloon_process+939>: cmpb $0x0,0xc0a105ae
0xc063260e <balloon_process+946>: mov %ebx,%eax
0xc0632610 <balloon_process+948>: jne 0xc063261c
<balloon_process+960>
0xc0632612 <balloon_process+950>: call 0xc0404eff
<get_phys_to_machine>
0xc0632617 <balloon_process+955>: and $0x7fffffff,%eax
0xc063261c <balloon_process+960>: mov -0x38(%ebp),%edx
0xc063261f <balloon_process+963>: cmp %edi,%eax
0xc0632621 <balloon_process+965>: mov %eax,-0x3f498120(,%edx,4)
0xc0632628 <balloon_process+972>: mov $0x1,%eax
0xc063262d <balloon_process+977>: cmove -0x58(%ebp),%eax
0xc0632631 <balloon_process+981>: or $0xffffffff,%edx
0xc0632634 <balloon_process+984>: mov %eax,-0x58(%ebp)
0xc0632637 <balloon_process+987>: mov %ebx,%eax
0xc0632639 <balloon_process+989>: call 0xc040662b
<set_phys_to_machine>
0xc063263e <balloon_process+994>: mov -0x4c(%ebp),%edx
0xc0632641 <balloon_process+997>: mov (%edx),%eax
0xc0632643 <balloon_process+999>: shr $0x1e,%eax
0xc0632646 <balloon_process+1002>: imul $0xb00,%eax,%eax
0xc063264c <balloon_process+1008>: add $0xc09f1380,%eax
0xc0632651 <balloon_process+1013>: sub 0xaec(%eax),%eax
0xc0632657 <balloon_process+1019>: cmp $0x1600,%eax
0xc063265c <balloon_process+1024>:
je 0xc063267c <balloon_process+1056>
0xc063265e <balloon_process+1026>: cmp $0x2100,%eax
0xc0632663 <balloon_process+1031>:
jne 0xc06327d1 <balloon_process+1397>
0xc0632669 <balloon_process+1037>: cmpl $0x2,0xc0b58d3c
0xc0632670 <balloon_process+1044>:
jne 0xc06327d1 <balloon_process+1397>
0xc0632676 <balloon_process+1050>:
jmp 0xc063267c <balloon_process+1056>
0xc0632678 <balloon_process+1052>: ud2a
0xc063267a <balloon_process+1054>:
jmp 0xc063267a <balloon_process+1054>
0xc063267c <balloon_process+1056>: incl -0x38(%ebp)
0xc063267f <balloon_process+1059>: mov -0x38(%ebp),%edi
0xc0632682 <balloon_process+1062>: mov -0x38(%ebp),%ebx
0xc0632685 <balloon_process+1065>: mov 0xc0b67edc,%edx
0xc063268b <balloon_process+1071>: add -0x48(%ebp),%edi
0xc063268e <balloon_process+1074>: add -0x44(%ebp),%ebx
0xc0632691 <balloon_process+1077>: cmp %edx,-0x38(%ebp)
0xc0632694 <balloon_process+1080>: jb 0xc0632607
<balloon_process+939>
0xc063269a <balloon_process+1086>: cmpl $0x0,-0x58(%ebp)
0xc063269e <balloon_process+1090>:
je 0xc06326e3 <balloon_process+1159>
0xc06326a0 <balloon_process+1092>: mov -0x64(%ebp),%edi
0xc06326a3 <balloon_process+1095>: xor %eax,%eax
so the crash occurs just after a call to set_phys_to_machine
Michael Young
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