[syzbot] [kvm?] general protection fault in is_page_fault_stale

From: syzbot
Date: Mon Jul 22 2024 - 10:53:38 EST

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Hello,

syzbot found the following issue on:

HEAD commit: 2c9b3512402e Merge tag 'for-linus' of git://git.kernel.org..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17abcfe9980000
kernel config: https://syzkaller.appspot.com/x/.config?x=e322acd9c27a6b84
dashboard link: https://syzkaller.appspot.com/bug?extid=23786faffb695f17edaa
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: i386

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/c112a5c3b199/disk-2c9b3512.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d0dae74e61d2/vmlinux-2c9b3512.xz
kernel image: https://storage.googleapis.com/syzbot-assets/54648874d89c/bzImage-2c9b3512.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+23786faffb695f17edaa@xxxxxxxxxxxxxxxxxxxxxxxxx

RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
Oops: general protection fault, probably for non-canonical address 0xe000013ffffffffd: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: maybe wild-memory-access in range [0x000029ffffffffe8-0x000029ffffffffef]
CPU: 0 PID: 11829 Comm: syz.1.1799 Not tainted 6.10.0-syzkaller-11185-g2c9b3512402e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
RIP: 0010:to_shadow_page arch/x86/kvm/mmu/spte.h:245 [inline]
RIP: 0010:spte_to_child_sp arch/x86/kvm/mmu/spte.h:250 [inline]
RIP: 0010:root_to_sp arch/x86/kvm/mmu/spte.h:267 [inline]
RIP: 0010:is_page_fault_stale+0xc4/0x530 arch/x86/kvm/mmu/mmu.c:4517
Code: e9 00 01 00 00 48 b8 ff ff ff ff ff 00 00 00 48 21 c3 48 c1 e3 06 49 bc 28 00 00 00 00 ea ff ff 49 01 dc 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 6d b7 d8 00 4d 8b 2c 24 31 ff 4c
RSP: 0018:ffffc9000fc6f6f0 EFLAGS: 00010202
RAX: 0000053ffffffffd RBX: 00003fffffffffc0 RCX: ffff88806a8bda00
RDX: 0000000000000000 RSI: 000fffffffffffff RDI: 00000000000129d3
RBP: 00000000000129d3 R08: ffffffff8120c8e0 R09: 1ffff920005e6c00
R10: dffffc0000000000 R11: fffff520005e6c01 R12: 000029ffffffffe8
R13: dffffc0000000000 R14: ffffc9000fc6f800 R15: ffff88807cbed000
FS: 0000000000000000(0000) GS:ffff8880b9400000(0063) knlGS:00000000f5d46b40
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000576d24c0 CR3: 000000007d930000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
kvm_tdp_mmu_page_fault arch/x86/kvm/mmu/mmu.c:4662 [inline]
kvm_tdp_page_fault+0x25c/0x320 arch/x86/kvm/mmu/mmu.c:4693
kvm_mmu_do_page_fault+0x589/0xca0 arch/x86/kvm/mmu/mmu_internal.h:323
kvm_tdp_map_page arch/x86/kvm/mmu/mmu.c:4715 [inline]
kvm_arch_vcpu_pre_fault_memory+0x2db/0x5a0 arch/x86/kvm/mmu/mmu.c:4760
kvm_vcpu_pre_fault_memory+0x24c/0x4b0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4418
kvm_vcpu_ioctl+0xa47/0xea0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4648
kvm_vcpu_compat_ioctl+0x242/0x450 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4700
__do_compat_sys_ioctl fs/ioctl.c:1007 [inline]
__se_compat_sys_ioctl+0x51c/0xca0 fs/ioctl.c:950
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0xb4/0x110 arch/x86/entry/common.c:386
do_fast_syscall_32+0x34/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7f92579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f5d4656c EFLAGS: 00000206 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00000000c040aed5
RDX: 0000000020000040 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:to_shadow_page arch/x86/kvm/mmu/spte.h:245 [inline]
RIP: 0010:spte_to_child_sp arch/x86/kvm/mmu/spte.h:250 [inline]
RIP: 0010:root_to_sp arch/x86/kvm/mmu/spte.h:267 [inline]
RIP: 0010:is_page_fault_stale+0xc4/0x530 arch/x86/kvm/mmu/mmu.c:4517
Code: e9 00 01 00 00 48 b8 ff ff ff ff ff 00 00 00 48 21 c3 48 c1 e3 06 49 bc 28 00 00 00 00 ea ff ff 49 01 dc 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 6d b7 d8 00 4d 8b 2c 24 31 ff 4c
RSP: 0018:ffffc9000fc6f6f0 EFLAGS: 00010202
RAX: 0000053ffffffffd RBX: 00003fffffffffc0 RCX: ffff88806a8bda00
RDX: 0000000000000000 RSI: 000fffffffffffff RDI: 00000000000129d3
RBP: 00000000000129d3 R08: ffffffff8120c8e0 R09: 1ffff920005e6c00
R10: dffffc0000000000 R11: fffff520005e6c01 R12: 000029ffffffffe8
R13: dffffc0000000000 R14: ffffc9000fc6f800 R15: ffff88807cbed000
FS: 0000000000000000(0000) GS:ffff8880b9400000(0063) knlGS:00000000f5d46b40
CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000576d24c0 CR3: 000000007d930000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: e9 00 01 00 00 jmp 0x105
5: 48 b8 ff ff ff ff ff movabs $0xffffffffff,%rax
c: 00 00 00
f: 48 21 c3 and %rax,%rbx
12: 48 c1 e3 06 shl $0x6,%rbx
16: 49 bc 28 00 00 00 00 movabs $0xffffea0000000028,%r12
1d: ea ff ff
20: 49 01 dc add %rbx,%r12
23: 4c 89 e0 mov %r12,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 4c 89 e7 mov %r12,%rdi
34: e8 6d b7 d8 00 call 0xd8b7a6
39: 4d 8b 2c 24 mov (%r12),%r13
3d: 31 ff xor %edi,%edi
3f: 4c rex.WR

---
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Next message: Nícolas F. R. A. Prado: "Re: Probe failure of usb controller @11290000 on MT8195 after next-20231221"
Previous message: Laurent Pinchart: "Re: [PATCH v5 04/14] staging: media: starfive: Add a params sink pad and a scd source pad for ISP"
Next in thread: Sean Christopherson: "Re: [syzbot] [kvm?] general protection fault in is_page_fault_stale"
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