Re: linux-next20240827 onwards: KVM guest crash BUG: Bad page state in process ksmd

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 29.08.24 13:28, Aithal, Srikanth wrote:
Hello,

Starting linux-next20240827 build, running QEMU KVM instance with option to freeze the CPU at the very beginning and then continue results in below guest crash. Disabling CONFIG_KSM will make this issue go away. Same issue exists with todays linux-next as well.

/SecCoreStartupWithStack(0xFFFCC000, 0x820000)
error: kvm run failed Bad address
RAX=0000000000232000 RBX=00000000fffdb101 RCX=000000000081fab0 RDX=00000000fffd7b03 RSI=0000000000807000 RDI=00000000fffd262b RBP=000000000081fc00 RSP=000000000081faa0 R8 =00000000fffd7af7 R9 =0000000000000071 R10=0000000000400000 R11=0000000000000000 R12=00000000fffcc094 R13=00000000fffcc000 R14=00000000ffdce000 R15=0000000000000600
RIP=00000000fffd1cb5 RFL=00000087 [--S--PC] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0018 0000000000000000 ffffffff 00c09300 DPL=0 DS   [-WA]
CS =0038 0000000000000000 ffffffff 00a09b00 DPL=0 CS64 [-RA]
SS =0018 0000000000000000 ffffffff 00c09300 DPL=0 DS   [-WA]
DS =0018 0000000000000000 ffffffff 00c09300 DPL=0 DS   [-WA]
FS =0018 0000000000000000 ffffffff 00c09300 DPL=0 DS   [-WA]
GS =0018 0000000000000000 ffffffff 00c09300 DPL=0 DS   [-WA]
LDT=0000 0000000000000000 0000ffff 00008200 DPL=0 LDT
TR =0000 0000000000000000 0000ffff 00008b00 DPL=0 TSS64-busy
GDT=     00000000fffffed0 0000003f
IDT=     000000000081fd70 0000021f
CR0=80000033 CR2=0000000000000000 CR3=0000000000800000 CR4=00000660
DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000
DR6=00000000ffff0ff0 DR7=0000000000000400
EFER=0000000000000500
Code=05 00 10 00 00 49 81 ee 00 10 00 00 48 3d 00 00 00 02 77 12 <41> 81 7e 28 5f 46 56 48 75 e1 49 3b 46 20 73 05 eb d9 4d 89 ee 48 8d 8d 10 ff ff ff ba 02
/

_Host dmesg throws:_

/[  232.158038] BUG: Bad page state in process ksmd pfn:404740a
[  232.164393] page: refcount:0 mapcount:1 mapping:0000000000000000 index:0x7f8687c0a pfn:0x404740a [  232.164401] flags: 0x17ffffc0020819(locked|uptodate|dirty|owner_2|swapbacked|node=0|zone=2|lastcpupid=0x1fffff) [  232.164412] raw: 0017ffffc0020819 dead000000000100 dead000000000122 0000000000000000 [  232.164417] raw: 00000007f8687c0a 0000000000000000 0000000000000000 0000000000000000
[  232.164420] page dumped because: PAGE_FLAGS_CHECK_AT_FREE flag(s) set

Might be related to Willy's page flag rework. Not 100% sure, though, what's happening here.

Is there a way to revert the recent changes from Willy to include/linux/page-flags.h and see if the problem goes away?

--
Cheers,

David / dhildenb





[Index of Archives]     [Linux Kernel]     [Linux USB Development]     [Yosemite News]     [Linux SCSI]

  Powered by Linux