linux-kernel - [syzbot] WARNING in fpregs_assert_state

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Date:   Tue, 08 Feb 2022 00:31:21 -0800
From:   syzbot <syzbot+3c0a98026cec79f550a2@...kaller.appspotmail.com>
To:     bp@...en8.de, dave.hansen@...ux.intel.com, hpa@...or.com,
        linux-kernel@...r.kernel.org, mingo@...hat.com,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de, x86@...nel.org
Subject: [syzbot] WARNING in fpregs_assert_state_consistent

Hello,

syzbot found the following issue on:

HEAD commit:    ef6b35306dd8 Add linux-next specific files for 20220204
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=14d34d0c700000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e0431e0b00810b4f
dashboard link: https://syzkaller.appspot.com/bug?extid=3c0a98026cec79f550a2
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

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

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3c0a98026cec79f550a2@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 3586 at arch/x86/kernel/fpu/core.c:768 fpregs_assert_state_consistent arch/x86/kernel/fpu/core.c:768 [inline]
WARNING: CPU: 0 PID: 3586 at arch/x86/kernel/fpu/core.c:768 fpregs_assert_state_consistent+0x80/0xe0 arch/x86/kernel/fpu/core.c:761
Modules linked in:
CPU: 0 PID: 3586 Comm: syz-fuzzer Not tainted 5.17.0-rc2-next-20220204-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:fpregs_assert_state_consistent arch/x86/kernel/fpu/core.c:768 [inline]
RIP: 0010:fpregs_assert_state_consistent+0x80/0xe0 arch/x86/kernel/fpu/core.c:761
Code: e9 55 ca 4c 00 e8 50 ca 4c 00 e8 db 97 2b 08 89 c3 65 48 8b 05 e9 90 d6 7e 4c 8d a5 80 18 00 00 49 39 c4 74 10 e8 30 ca 4c 00 <0f> 0b 5b 5d 41 5c e9 25 ca 4c 00 e8 20 ca 4c 00 4c 89 e2 48 b8 00
RSP: 0018:ffffc90001acfef0 EFLAGS: 00010093
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88807f2e9d40 RSI: ffffffff812bdec0 RDI: 0000000000000000
RBP: ffff88807f2e9d40 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff812bde8e R11: 0000000000000000 R12: ffff88807f2eb5c0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  000000c000030490(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6371976520 CR3: 000000007f14b000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 arch_exit_to_user_mode_prepare arch/x86/include/asm/entry-common.h:56 [inline]
 exit_to_user_mode_prepare+0x57/0x290 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x5edb02
Code: cc cc cc cc cc cc cc cc 49 3b 66 10 0f 86 fd 01 00 00 48 83 ec 48 48 89 6c 24 40 48 8d 6c 24 40 48 89 44 24 50 48 89 5c 24 58 <48> 8b 13 48 8b 70 20 8b 78 18 eb 06 48 89 fa 44 89 c7 48 89 54 24
RSP: 002b:000000c000241b28 EFLAGS: 00000216
RAX: 000000c0006c4000 RBX: 000000c0006c4028 RCX: 00000000000032c6
RDX: 0000000000008000 RSI: 000000c0006c4000 RDI: 0000000000000009
RBP: 000000c000241b68 R08: 00000000000032c5 R09: 000000c0006ca000
R10: 0000000000004d3b R11: 0000000000003250 R12: 0000000000002000
R13: 0000000000002dab R14: 000000c00029aea0 R15: 0000000000000002
 </TASK>


---
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