Date:   Tue, 21 Nov 2017 07:27:58 -0800
From:   syzbot 
        <bot+fa48f938d494498bd7c8fb24bc99a3a30a1d0677@...kaller.appspotmail.com>
To:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        perex@...ex.cz, syzkaller-bugs@...glegroups.com, tiwai@...e.com
Subject: WARNING in snd_timer_user_info_compat

Hello,

syzkaller hit the following crash on  
c8a0739b185d11d6e2ca7ad9f5835841d1cfc765
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.
C reproducer is attached
syzkaller reproducer is attached. See https://goo.gl/kgGztJ
for information about syzkaller reproducers


Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 3039 Comm: syzkaller881964 Not tainted 4.14.0+ #98
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:177
  fixup_bug arch/x86/kernel/traps.c:246 [inline]
  do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:295
  do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314
  invalid_op+0x18/0x20 arch/x86/entry/entry_64.S:926
RIP: 0010:snd_timer_user_info_compat.isra.6+0x3be/0x490  
sound/core/timer_compat.c:69
RSP: 0018:ffff8801cd037a70 EFLAGS: 00010293
RAX: ffff8801cd96a280 RBX: 1ffff10039a06f51 RCX: ffffffff8402d83e
RDX: 0000000000000000 RSI: 0000000020a73000 RDI: ffff8801cd2b6eb0
RBP: ffff8801cd037bd0 R08: ffffffff8403ab4b R09: 0000000000000000
R10: ffff8801cd037bd0 R11: ffffffff8747dd60 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff8801cd037ba8 R15: ffff8801cd037d18
  __snd_timer_user_ioctl_compat sound/core/timer_compat.c:161 [inline]
  snd_timer_user_ioctl_compat+0x4a6/0x890 sound/core/timer_compat.c:179
  C_SYSC_ioctl fs/compat_ioctl.c:1473 [inline]
  compat_SyS_ioctl+0x151/0x2a30 fs/compat_ioctl.c:1419
  do_syscall_32_irqs_on arch/x86/entry/common.c:327 [inline]
  do_fast_syscall_32+0x3ee/0xf9d arch/x86/entry/common.c:389
  entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:125
RIP: 0023:0xf7f8dc79
RSP: 002b:00000000ffcd112c EFLAGS: 00000282 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000080e05411
RDX: 0000000020a73000 RSI: 00000000080ef00c RDI: 000000000000003f
RBP: 0000000000001000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Dumping ftrace buffer:
    (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
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View attachment "config.txt" of type "text/plain" (126116 bytes)

Download attachment "raw.log" of type "application/octet-stream" (4406 bytes)

View attachment "repro.txt" of type "text/plain" (427 bytes)

Download attachment "repro.c" of type "application/octet-stream" (1331 bytes)

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