linux-kernel - WARNING in snd_pcm_hw_param

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Date:   Mon, 01 Jan 2018 10:58:01 -0800
From:   syzbot <syzbot+a8d726b19492f85fdb50@...kaller.appspotmail.com>
To:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        mingo@...nel.org, o-takashi@...amocchi.jp, perex@...ex.cz,
        syzkaller-bugs@...glegroups.com, tiwai@...e.com
Subject: WARNING in snd_pcm_hw_param_last

Hello,

syzkaller hit the following crash on  
30a7acd573899fd8b8ac39236eff6468b195ac7d
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
compiler: gcc (GCC) 7.1.1 20170620
.config is attached
Raw console output is attached.
syzkaller reproducer is attached. See https://goo.gl/kgGztJ
for information about syzkaller reproducers

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+a8d726b19492f85fdb50@...kaller.appspotmail.com
It will help syzbot understand when the bug is fixed. See footer for  
details.
If you forward the report, please keep this part and the footer.

WARNING: CPU: 1 PID: 4856 at sound/core/pcm_lib.c:1681  
snd_pcm_hw_param_last+0x28b/0x670 sound/core/pcm_lib.c:1681
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 4856 Comm: syz-executor7 Not tainted 4.15.0-rc6+ #245
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
  __dump_stack lib/dump_stack.c:17 [inline]
  dump_stack+0x194/0x257 lib/dump_stack.c:53
  panic+0x1e4/0x41c kernel/panic.c:183
  __warn+0x1dc/0x200 kernel/panic.c:547
  report_bug+0x211/0x2d0 lib/bug.c:184
  fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178
  fixup_bug arch/x86/kernel/traps.c:247 [inline]
  do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296
  do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
  invalid_op+0x22/0x40 arch/x86/entry/entry_64.S:1079
RIP: 0010:snd_pcm_hw_param_last+0x28b/0x670 sound/core/pcm_lib.c:1681
RSP: 0018:ffff8801d5e07498 EFLAGS: 00010293
RAX: ffff8801d5fe2080 RBX: ffff8801d5587200 RCX: ffffffff841bb75b
RDX: 0000000000000000 RSI: 00000000ffffffea RDI: ffffed003abc0e88
RBP: ffff8801d5e074e0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 000000000000000a
R13: 00000000ffffffea R14: 0000000000000002 R15: 0000000000000400
  snd_pcm_hw_param_near.constprop.27+0x6f5/0x9a0 sound/core/oss/pcm_oss.c:455
  snd_pcm_oss_change_params+0xb3d/0x3720 sound/core/oss/pcm_oss.c:878
  snd_pcm_oss_get_active_substream+0x10c/0x150 sound/core/oss/pcm_oss.c:1088
  snd_pcm_oss_get_channels sound/core/oss/pcm_oss.c:1708 [inline]
  snd_pcm_oss_set_channels+0x23e/0x3a0 sound/core/oss/pcm_oss.c:1700
  snd_pcm_oss_ioctl+0x1dcc/0x39f0 sound/core/oss/pcm_oss.c:2514
  vfs_ioctl fs/ioctl.c:46 [inline]
  do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:686
  SYSC_ioctl fs/ioctl.c:701 [inline]
  SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
  entry_SYSCALL_64_fastpath+0x23/0x9a
RIP: 0033:0x452ac9
RSP: 002b:00007fa5a61bec58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000071bf58 RCX: 0000000000452ac9
RDX: 0000000020004ff8 RSI: 00800000c0045006 RDI: 0000000000000003
RBP: 00000000000000ef R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006ef708
R13: 00000000ffffffff R14: 00007fa5a61bf6d4 R15: 0000000000000002
Dumping ftrace buffer:
    (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..

---
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