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
