linux-kernel - [syzbot] panic: runtime error: floating point error (2)

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Message-ID: <000000000000a33bfc06014b28c9@google.com>
Date:   Tue, 25 Jul 2023 01:02:56 -0700
From:   syzbot <syzbot+a76d93c00034a9fd23f5@...kaller.appspotmail.com>
To:     linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] panic: runtime error: floating point error (2)

Hello,

syzbot found the following issue on:

HEAD commit:    46670259519f Merge tag 'for-6.5-rc2-tag' of git://git.kern..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10b2e452a80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=a4507c291b5ab5d4
dashboard link: https://syzkaller.appspot.com/bug?extid=a76d93c00034a9fd23f5
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13213daea80000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f3b4b06a5f02/disk-46670259.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/4db334f36495/vmlinux-46670259.xz
kernel image: https://storage.googleapis.com/syzbot-assets/5977e704aeb2/bzImage-46670259.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a76d93c00034a9fd23f5@...kaller.appspotmail.com

2023/07/21 06:55:36 executed programs: 1794
2023/07/21 06:55:42 executed programs: 1851
2023/07/21 06:55:47 executed programs: 1914
2023/07/21 06:55:52 executed programs: 1976
2023/07/21 06:55:57 executed programs: 2046
panic: runtime error: floating point error
[signal SIGFPE: floating-point exception code=0x80 addr=0x0 pc=0x561291]

goroutine 22 [running]:
github.com/google/syzkaller/prog.ArgCommon.Type(...)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:61
github.com/google/syzkaller/prog.(*ConstArg).Size(0xc9f428?)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/prog.go:79 +0x91
github.com/google/syzkaller/prog.foreachArgImpl({0xc9f4a8?, 0xc000fdba80?}, 0xc000873e80, 0xc00107fbb8)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/analysis.go:152 +0x3ca
github.com/google/syzkaller/prog.foreachArgImpl({0xc9f4e8?, 0xc00008aae0?}, 0xc000873e80, 0xc00107fbb8)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/analysis.go:168 +0x2ce
github.com/google/syzkaller/prog.ForeachArg(0xc00028eb90, 0x46734e?)
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/analysis.go:127 +0xde
github.com/google/syzkaller/prog.(*Prog).FallbackSignal(0xc001018b00, {0xc00086d180, 0x8, 0x0?})
	/syzkaller/gopath/src/github.com/google/syzkaller/prog/analysis.go:249 +0x275
github.com/google/syzkaller/pkg/ipc.addFallbackSignal(0xc0005001c0?, 0xc000857bc0)
	/syzkaller/gopath/src/github.com/google/syzkaller/pkg/ipc/ipc.go:321 +0x146
github.com/google/syzkaller/pkg/ipc.(*Env).Exec(0xc00027c630, 0x0?, 0xc001018b00)
	/syzkaller/gopath/src/github.com/google/syzkaller/pkg/ipc/ipc.go:295 +0x359
main.(*Context).execute(0xc0005000e0, 0x0?, 0x0?, 0x0?)
	/syzkaller/gopath/src/github.com/google/syzkaller/tools/syz-execprog/execprog.go:171 +0x146
main.(*Context).run(0xc0005000e0, 0x0?)
	/syzkaller/gopath/src/github.com/google/syzkaller/tools/syz-execprog/execprog.go:156 +0xc5
main.main.func3()
	/syzkaller/gopath/src/github.com/google/syzkaller/tools/syz-execprog/execprog.go:119 +0x5c
created by main.main
	/syzkaller/gopath/src/github.com/google/syzkaller/tools/syz-execprog/execprog.go:117 +0x588


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the bug is already fixed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to change bug's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the bug is a duplicate of another bug, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup