[syzbot] BUG: unable to handle kernel paging request in kvm_arch_hardware_enable

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 7ebfc85e2cd7 Merge tag 'net-6.0-rc1' of git://git.kernel.o..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=13d10985080000
kernel config: https://syzkaller.appspot.com/x/.config?x=20bc0b329895d963
dashboard link: https://syzkaller.appspot.com/bug?extid=4f6eb69074ff62a1a33b
compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1538e0b5080000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=112756f3080000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+4f6eb6...@syzkaller.appspotmail.com

BUG: unable to handle page fault for address: ffffc900039aa330
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 12000067
P4D 12000067
PUD 121c9067
PMD 1d46a067
PTE 0

Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 3620 Comm: syz-executor254 Not tainted 5.19.0-syzkaller-13930-g7ebfc85e2cd7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:29 [inline]
RIP: 0010:atomic_read include/linux/atomic/atomic-instrumented.h:28 [inline]
RIP: 0010:kvm_arch_hardware_enable+0x1d1/0x6d0 arch/x86/kvm/x86.c:11847
Code: 89 5c 24 38 4c 8d 73 f0 4c 89 f7 be 04 00 00 00 e8 a4 44 cc 00 4d 89 f5 49 c1 ed 03 43 0f b6 44 3d 00 84 c0 0f 85 08 02 00 00 <41> 8b 06 ff c8 48 63 d0 4c 89 64 24 10 4c 89 e7 48 8d 74 24 60 b9
RSP: 0018:ffffc900038dfaa0 EFLAGS: 00010082

RAX: 0000000000000000 RBX: ffffc900039aa340 RCX: ffffffff8110f0c2
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffc900039aa330
RBP: ffffc900038dfb80 R08: dffffc0000000000 R09: fffff52000735466
R10: fffff52000735467 R11: 1ffff92000735466 R12: ffffc900039aa240
R13: 1ffff92000735466 R14: ffffc900039aa330 R15: dffffc0000000000
FS: 0000555555610300(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc900039aa330 CR3: 0000000076051000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
hardware_enable_nolock+0xa1/0x140 arch/x86/kvm/../../../virt/kvm/kvm_main.c:5007
smp_call_function_many_cond+0xebc/0x16f0 kernel/smp.c:979
on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1154
on_each_cpu include/linux/smp.h:71 [inline]
hardware_enable_all+0x77/0x120 arch/x86/kvm/../../../virt/kvm/kvm_main.c:5069
kvm_create_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:1202 [inline]
kvm_dev_ioctl_create_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:4910 [inline]
kvm_dev_ioctl+0x1076/0x17e0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4957
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fd926d9c049
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffce6c2e948 EFLAGS: 00000246
ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fd926d9c049
RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000003
RBP: 00007ffce6c2e960 R08: 0000000000000002 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000
</TASK>
Modules linked in:
CR2: ffffc900039aa330
---[ end trace 0000000000000000 ]---
RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:29 [inline]
RIP: 0010:atomic_read include/linux/atomic/atomic-instrumented.h:28 [inline]
RIP: 0010:kvm_arch_hardware_enable+0x1d1/0x6d0 arch/x86/kvm/x86.c:11847
Code: 89 5c 24 38 4c 8d 73 f0 4c 89 f7 be 04 00 00 00 e8 a4 44 cc 00 4d 89 f5 49 c1 ed 03 43 0f b6 44 3d 00 84 c0 0f 85 08 02 00 00 <41> 8b 06 ff c8 48 63 d0 4c 89 64 24 10 4c 89 e7 48 8d 74 24 60 b9
RSP: 0018:ffffc900038dfaa0 EFLAGS: 00010082

RAX: 0000000000000000 RBX: ffffc900039aa340 RCX: ffffffff8110f0c2
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffc900039aa330
RBP: ffffc900038dfb80 R08: dffffc0000000000 R09: fffff52000735466
R10: fffff52000735467 R11: 1ffff92000735466 R12: ffffc900039aa240
R13: 1ffff92000735466 R14: ffffc900039aa330 R15: dffffc0000000000
FS: 0000555555610300(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc900039aa330 CR3: 0000000076051000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 89 5c 24 38 mov %ebx,0x38(%rsp)
4: 4c 8d 73 f0 lea -0x10(%rbx),%r14
8: 4c 89 f7 mov %r14,%rdi
b: be 04 00 00 00 mov $0x4,%esi
10: e8 a4 44 cc 00 callq 0xcc44b9
15: 4d 89 f5 mov %r14,%r13
18: 49 c1 ed 03 shr $0x3,%r13
1c: 43 0f b6 44 3d 00 movzbl 0x0(%r13,%r15,1),%eax
22: 84 c0 test %al,%al
24: 0f 85 08 02 00 00 jne 0x232
* 2a: 41 8b 06 mov (%r14),%eax <-- trapping instruction
2d: ff c8 dec %eax
2f: 48 63 d0 movslq %eax,%rdx
32: 4c 89 64 24 10 mov %r12,0x10(%rsp)
37: 4c 89 e7 mov %r12,%rdi
3a: 48 8d 74 24 60 lea 0x60(%rsp),%rsi
3f: b9 .byte 0xb9


---
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[Sean Christopherson]

On Tue, Aug 16, 2022, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 7ebfc85e2cd7 Merge tag 'net-6.0-rc1' of git://git.kernel.o..
> git tree: upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=13d10985080000
> kernel config: https://syzkaller.appspot.com/x/.config?x=20bc0b329895d963
> dashboard link: https://syzkaller.appspot.com/bug?extid=4f6eb69074ff62a1a33b
> compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1538e0b5080000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=112756f3080000
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+4f6eb6...@syzkaller.appspotmail.com

Fix posted[*], apparently the sybot id changes when bugs get forwarded upstream.

[*] https://lore.kernel.org/all/20220816053937....@google.com