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Message-ID: <CAO4mrfcetHg_K4hOTYiMmLrYsCDp4Lij6u3NhrriTee+JpL9Gw@mail.gmail.com>
Date: Mon, 31 Oct 2022 20:07:55 +0800
From: Wei Chen <harperchen1110@...il.com>
To: tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, x86@...nel.org,
hpa@...or.com
Cc: linux-kernel@...r.kernel.org
Subject: Re: WARNING in save_fpregs_to_fpstate
Dear Linux developers,
Here is the link to the reproducers.
C reproducer: https://drive.google.com/file/d/1yhjiEJE1XlXDcmjuoaw-koWvgFEDpPTP/view?usp=share_link
Syz reproducer:
https://drive.google.com/file/d/191weDFK0f3TSUjj9VkCe_Mc-FHYJDJYF/view?usp=share_link
The bug persists in the latest commit, v5.15.76 (4f5365f77018). Hope
it is helpful.
[ 45.409368][ T6874] WARNING: CPU: 0 PID: 6874 at
./arch/x86/include/asm/fpu/internal.h:304
save_fpregs_to_fpstate+0x94/0xb0
[ 45.412053][ T6874] Modules linked in:
[ 45.412973][ T6874] CPU: 0 PID: 6874 Comm: a.out Not tainted 5.15.76 #3
[ 45.414559][ T6874] Hardware name: QEMU Standard PC (i440FX + PIIX,
1996), BIOS rel-1.13.0-48-gd9c812dda519-prebuilt.qemu.org 04/01/2014
[ 45.417442][ T6874] RIP: 0010:save_fpregs_to_fpstate+0x94/0xb0
[ 45.418840][ T6874] Code: 04 48 89 43 08 5b 5d 41 5c 41 5d e9 c6 21
27 00 e8 c1 21 27 00 48 0f ae 43 40 5b 5d 41 5c 41 5d e9 b1 21 27 00
e8 ac 21 27 00 <0f> 0b eb b9 e8 a3 21 27 00 0f 0b eb 98 0f 1f 44 00 00
66 2e 0f 1f
[ 45.423504][ T6874] RSP: 0018:ffffc900025ebdc0 EFLAGS: 00010293
[ 45.424936][ T6874] RAX: 0000000000000000 RBX: ffff888010fd30c0
RCX: 0000000000000000
[ 45.426794][ T6874] RDX: ffff8881074c3780 RSI: ffffffff8110fed4
RDI: ffff888010fd3100
[ 45.428661][ T6874] RBP: 00000000fffffffe R08: 0000000000000000
R09: 0000000000000000
[ 45.430564][ T6874] R10: 0000000000000001 R11: 0000000000000002
R12: 0000000000000007
[ 45.432509][ T6874] R13: 0000000000000000 R14: 0000000000000000
R15: ffffc9000263c0c8
[ 45.435006][ T6874] FS: 00007f28babdc700(0000)
GS:ffff88807dc00000(0000) knlGS:0000000000000000
[ 45.437795][ T6874] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 45.439891][ T6874] CR2: 0000000000000000 CR3: 0000000012c4a000
CR4: 00000000000026e0
[ 45.442361][ T6874] Call Trace:
[ 45.443162][ T6874] <TASK>
[ 45.443873][ T6874] kvm_save_current_fpu+0x4a/0x60
[ 45.445048][ T6874] kvm_put_guest_fpu+0x34/0x1c0
[ 45.446183][ T6874] kvm_arch_vcpu_ioctl_run+0x245/0x8d0
[ 45.447468][ T6874] kvm_vcpu_ioctl+0x3f5/0x8c0
[ 45.448561][ T6874] ? __fget_files+0x141/0x260
[ 45.449650][ T6874] ? do_vfs_ioctl+0x150/0xaa0
[ 45.450783][ T6874] ? kvm_uevent_notify_change.part.66+0x250/0x250
[ 45.452279][ T6874] __x64_sys_ioctl+0xb6/0x100
[ 45.453368][ T6874] do_syscall_64+0x34/0xb0
[ 45.454413][ T6874] entry_SYSCALL_64_after_hwframe+0x61/0xcb
[ 45.455796][ T6874] RIP: 0033:0x7f28ba4eb469
[ 45.456824][ T6874] Code: 00 f3 c3 66 2e 0f 1f 84 00 00 00 00 00 0f
1f 40 00 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 8b 0d ff 49 2b 00 f7 d8
64 89 01 48
[ 45.462144][ T6874] RSP: 002b:00007f28babdbde8 EFLAGS: 00000217
ORIG_RAX: 0000000000000010
[ 45.464735][ T6874] RAX: ffffffffffffffda RBX: 0000000000000000
RCX: 00007f28ba4eb469
[ 45.467057][ T6874] RDX: 0000000000000000 RSI: 000000000000ae80
RDI: 0000000000000005
[ 45.468932][ T6874] RBP: 00007f28babdbe20 R08: 0000000100000001
R09: 0000000000000000
[ 45.470821][ T6874] R10: 0000000100000001 R11: 0000000000000217
R12: 00007ffd098d389e
[ 45.472679][ T6874] R13: 00007ffd098d389f R14: 00007f28babbc000
R15: 0000000000000003
[ 45.474535][ T6874] </TASK>
[ 45.475244][ T6874] Kernel panic - not syncing: panic_on_warn set ...
[ 45.476760][ T6874] CPU: 0 PID: 6874 Comm: a.out Not tainted 5.15.76 #3
[ 45.478314][ T6874] Hardware name: QEMU Standard PC (i440FX + PIIX,
1996), BIOS rel-1.13.0-48-gd9c812dda519-prebuilt.qemu.org 04/01/2014
[ 45.481203][ T6874] Call Trace:
[ 45.481960][ T6874] <TASK>
[ 45.482639][ T6874] dump_stack_lvl+0x8d/0xcf
[ 45.483697][ T6874] panic+0x165/0x3ed
[ 45.484606][ T6874] ? __warn+0xe0/0x140
[ 45.485554][ T6874] ? save_fpregs_to_fpstate+0x94/0xb0
[ 45.486800][ T6874] __warn+0xf6/0x140
[ 45.487709][ T6874] ? save_fpregs_to_fpstate+0x94/0xb0
[ 45.488972][ T6874] report_bug+0x112/0x1b0
[ 45.489979][ T6874] handle_bug+0x3f/0x70
[ 45.490944][ T6874] exc_invalid_op+0x13/0x60
[ 45.492011][ T6874] asm_exc_invalid_op+0x16/0x20
[ 45.493164][ T6874] RIP: 0010:save_fpregs_to_fpstate+0x94/0xb0
[ 45.494545][ T6874] Code: 04 48 89 43 08 5b 5d 41 5c 41 5d e9 c6 21
27 00 e8 c1 21 27 00 48 0f ae 43 40 5b 5d 41 5c 41 5d e9 b1 21 27 00
e8 ac 21 27 00 <0f> 0b eb b9 e8 a3 21 27 00 0f 0b eb 98 0f 1f 44 00 00
66 2e 0f 1f
[ 45.499101][ T6874] RSP: 0018:ffffc900025ebdc0 EFLAGS: 00010293
[ 45.500514][ T6874] RAX: 0000000000000000 RBX: ffff888010fd30c0
RCX: 0000000000000000
[ 45.502351][ T6874] RDX: ffff8881074c3780 RSI: ffffffff8110fed4
RDI: ffff888010fd3100
[ 45.504207][ T6874] RBP: 00000000fffffffe R08: 0000000000000000
R09: 0000000000000000
[ 45.506058][ T6874] R10: 0000000000000001 R11: 0000000000000002
R12: 0000000000000007
[ 45.507916][ T6874] R13: 0000000000000000 R14: 0000000000000000
R15: ffffc9000263c0c8
[ 45.509767][ T6874] ? save_fpregs_to_fpstate+0x94/0xb0
[ 45.511022][ T6874] kvm_save_current_fpu+0x4a/0x60
[ 45.512209][ T6874] kvm_put_guest_fpu+0x34/0x1c0
[ 45.513339][ T6874] kvm_arch_vcpu_ioctl_run+0x245/0x8d0
[ 45.514616][ T6874] kvm_vcpu_ioctl+0x3f5/0x8c0
[ 45.515715][ T6874] ? __fget_files+0x141/0x260
[ 45.516815][ T6874] ? do_vfs_ioctl+0x150/0xaa0
[ 45.517919][ T6874] ? kvm_uevent_notify_change.part.66+0x250/0x250
[ 45.519421][ T6874] __x64_sys_ioctl+0xb6/0x100
[ 45.520513][ T6874] do_syscall_64+0x34/0xb0
[ 45.521540][ T6874] entry_SYSCALL_64_after_hwframe+0x61/0xcb
[ 45.522909][ T6874] RIP: 0033:0x7f28ba4eb469
[ 45.523954][ T6874] Code: 00 f3 c3 66 2e 0f 1f 84 00 00 00 00 00 0f
1f 40 00 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 8b 0d ff 49 2b 00 f7 d8
64 89 01 48
[ 45.528519][ T6874] RSP: 002b:00007f28babdbde8 EFLAGS: 00000217
ORIG_RAX: 0000000000000010
[ 45.530474][ T6874] RAX: ffffffffffffffda RBX: 0000000000000000
RCX: 00007f28ba4eb469
[ 45.532389][ T6874] RDX: 0000000000000000 RSI: 000000000000ae80
RDI: 0000000000000005
[ 45.534233][ T6874] RBP: 00007f28babdbe20 R08: 0000000100000001
R09: 0000000000000000
[ 45.536096][ T6874] R10: 0000000100000001 R11: 0000000000000217
R12: 00007ffd098d389e
[ 45.537931][ T6874] R13: 00007ffd098d389f R14: 00007f28babbc000
R15: 0000000000000003
[ 45.539778][ T6874] </TASK>
[ 45.541237][ T6874] Kernel Offset: disabled
[ 45.542327][ T6874] Rebooting in 86400 seconds..
Thank you,
Wei
On Sun, 30 Oct 2022 at 18:37, Wei Chen <harperchen1110@...il.com> wrote:
>
> Dear Linux Developer,
>
> Recently when using our tool to fuzz kernel, the following crash was triggered:
>
> HEAD commit: 64570fbc14f8 Linux 5.15-rc5
> git tree: upstream
> compiler: gcc 8.0.1
> console output:
> https://drive.google.com/file/d/1DkbPrIA6cVbIgS86sfFCZARE1jKhbMTk/view?usp=share_link
> kernel config: https://drive.google.com/file/d/1uDOeEYgJDcLiSOrx9W8v2bqZ6uOA_55t/view?usp=share_link
>
> Unfortunately, I don't have any reproducer for this crash yet.
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: Wei Chen <harperchen1110@...il.com>
>
> set kvm_intel.dump_invalid_vmcs=1 to dump internal KVM state.
> ------------[ cut here ]------------
> WARNING: CPU: 1 PID: 11082 at arch/x86/include/asm/fpu/internal.h:304
> save_fpregs_to_fpstate+0xc2/0xe0
> Modules linked in:
> CPU: 1 PID: 11082 Comm: syz-executor.0 Not tainted 5.15.0-rc5 #1
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> rel-1.13.0-48-gd9c812dda519-prebuilt.qemu.org 04/01/2014
> RIP: 0010:save_fpregs_to_fpstate+0xc2/0xe0
> Code: 08 5b 5d 41 5c 41 5d 41 5e e9 da c3 29 00 e8 d5 c3 29 00 48 0f
> ae 45 40 5b 5d 41 5c 41 5d 41 5e e9 c3 c3 29 00 e8 be c3 29 00 <0f> 0b
> eb a2 e8 b5 c3 29 00 0f 0b e9 75 ff ff ff 0f 1f 40 00 66 2e
> RSP: 0018:ffffc900028ffda0 EFLAGS: 00010212
> RAX: 000000000000e11d RBX: 00000000fffffffe RCX: 0000000000040000
> RDX: ffffc90002a29000 RSI: ffff888135ae3700 RDI: 0000000000000002
> RBP: ffff888010bde180 R08: ffffffff8113afa2 R09: 0000000000000000
> R10: 0000000000000005 R11: 00000000fffffffe R12: 0000000000000007
> R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001
> FS: 00007ffa8d5d6700(0000) GS:ffff88813dc00000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000000000000 CR3: 000000003d98d000 CR4: 00000000000026e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000006e52
> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> Call Trace:
> kvm_save_current_fpu+0x61/0x70
> kvm_put_guest_fpu+0x34/0x230
> kvm_arch_vcpu_ioctl_run+0x541/0xb20
> kvm_vcpu_ioctl+0x3b8/0xa30
> __x64_sys_ioctl+0xe8/0x140
> do_syscall_64+0x34/0xb0
> entry_SYSCALL_64_after_hwframe+0x44/0xae
> RIP: 0033:0x4692c9
> Code: f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 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 bc ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007ffa8d5d5c38 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
> RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004692c9
> RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
> RBP: 000000000119bfb0 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bfac
> R13: 0000000000000000 R14: 000000000119bfa0 R15: 00007fff96fd8ad0
>
> Best,
> Wei
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