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Date:   Tue, 01 Sep 2020 03:08:16 -0700
Message-ID: <000000000000971bc005ae3db23d@google.com>
Subject: WARNING in snd_pcm_plugin_build_mulaw
From:   syzbot <syzbot+23b22dc2e0b81cbfcc95@syzkaller.appspotmail.com>
To:     alsa-devel@alsa-project.org, broonie@kernel.org,
        festevam@gmail.com, linux-kernel@vger.kernel.org, perex@perex.cz,
        robh@kernel.org, syzkaller-bugs@googlegroups.com, tiwai@suse.com
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Sender: linux-kernel-owner@vger.kernel.org
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Hello,

syzbot found the following issue on:

HEAD commit:    15bc20c6 Merge tag 'tty-5.9-rc3' of git://git.kernel.org/p..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1268efb1900000
kernel config:  https://syzkaller.appspot.com/x/.config?x=891ca5711a9f1650
dashboard link: https://syzkaller.appspot.com/bug?extid=23b22dc2e0b81cbfcc95
compiler:       clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11a95f41900000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11a452f2900000

The issue was bisected to:

commit f3ca3f5b0966cfc2737178cca8a7a65b09991898
Author: Fabio Estevam <festevam@gmail.com>
Date:   Fri Mar 27 15:57:21 2020 +0000

    dt-bindings: sound: cs42l51: Remove unneeded I2C unit name

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=15395f41900000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=17395f41900000
console output: https://syzkaller.appspot.com/x/log.txt?x=13395f41900000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+23b22dc2e0b81cbfcc95@syzkaller.appspotmail.com
Fixes: f3ca3f5b0966 ("dt-bindings: sound: cs42l51: Remove unneeded I2C unit name")

------------[ cut here ]------------
WARNING: CPU: 0 PID: 6835 at sound/core/oss/mulaw.c:332 snd_pcm_plugin_build_mulaw+0x4ef/0x6e0 sound/core/oss/mulaw.c:332
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 6835 Comm: syz-executor088 Not tainted 5.9.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1f0/0x31e lib/dump_stack.c:118
 panic+0x264/0x7a0 kernel/panic.c:231
 __warn+0x227/0x250 kernel/panic.c:600
 report_bug+0x1b1/0x2e0 lib/bug.c:198
 handle_bug+0x42/0x80 arch/x86/kernel/traps.c:234
 exc_invalid_op+0x16/0x40 arch/x86/kernel/traps.c:254
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536
RIP: 0010:snd_pcm_plugin_build_mulaw+0x4ef/0x6e0 sound/core/oss/mulaw.c:332
Code: 0f 0b bb fa ff ff ff eb cd e8 fd e3 2d fb 0f 0b bb fa ff ff ff eb bf e8 ef e3 2d fb 0f 0b bb fa ff ff ff eb b1 e8 e1 e3 2d fb <0f> 0b bb fa ff ff ff eb a3 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c 77
RSP: 0018:ffffc90001ed7950 EFLAGS: 00010293
RAX: ffffffff8647143f RBX: 0000000000000000 RCX: ffff88808dcbc540
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffffff86471e70 R08: ffffffff864710ee R09: fffff520003daf47
R10: fffff520003daf47 R11: 0000000000000000 R12: 1ffff920003daf45
R13: ffffc90001ed7a18 R14: ffffc90001ed7a28 R15: ffffc90001ed7a28
 snd_pcm_plug_format_plugins+0xbbd/0x1640 sound/core/oss/pcm_plugin.c:494
 snd_pcm_oss_change_params_locked+0x2c29/0x4410 sound/core/oss/pcm_oss.c:952
 snd_pcm_oss_change_params sound/core/oss/pcm_oss.c:1084 [inline]
 snd_pcm_oss_make_ready+0x115/0x2b0 sound/core/oss/pcm_oss.c:1143
 snd_pcm_oss_sync+0x265/0x900 sound/core/oss/pcm_oss.c:1642
 snd_pcm_oss_release+0x119/0x270 sound/core/oss/pcm_oss.c:2546
 __fput+0x34f/0x7b0 fs/file_table.c:281
 task_work_run+0x137/0x1c0 kernel/task_work.c:141
 exit_task_work include/linux/task_work.h:25 [inline]
 do_exit+0x5f3/0x1f20 kernel/exit.c:806
 do_group_exit+0x161/0x2d0 kernel/exit.c:903
 __do_sys_exit_group+0x13/0x20 kernel/exit.c:914
 __se_sys_exit_group+0x10/0x10 kernel/exit.c:912
 __x64_sys_exit_group+0x37/0x40 kernel/exit.c:912
 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440038
Code: Bad RIP value.
RSP: 002b:00007ffe721a2058 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440038
RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
RBP: 00000000004bf870 R08: 00000000000000e7 R09: ffffffffffffffd0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000006d1180 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
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For information about bisection process see: https://goo.gl/tpsmEJ#bisection
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https://goo.gl/tpsmEJ#testing-patches