WARNING in hci_uart_set_baudrate (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 17529385 Linux 4.14.213
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=116bf6a3500000
kernel config: https://syzkaller.appspot.com/x/.config?x=f94010bb59bd4675
dashboard link: https://syzkaller.appspot.com/bug?extid=751a940eb1c7ee4b5ddc
compiler: gcc (GCC) 10.1.0-syz 20200507

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+751a94...@syzkaller.appspotmail.com

snd_pcm_kernel_ioctl+0x19d/0x330 sound/core/pcm_native.c:3028
snd_pcm_oss_change_params_locked+0x169c/0x3530 sound/core/oss/pcm_oss.c:965
------------[ cut here ]------------
snd_pcm_oss_change_params sound/core/oss/pcm_oss.c:1108 [inline]
snd_pcm_oss_get_active_substream+0x128/0x190 sound/core/oss/pcm_oss.c:1125
WARNING: CPU: 1 PID: 8044 at drivers/tty/tty_ioctl.c:318 tty_set_termios+0x708/0x810 drivers/tty/tty_ioctl.c:318
snd_pcm_oss_get_formats+0x66/0x280 sound/core/oss/pcm_oss.c:1837
Kernel panic - not syncing: panic_on_warn set ...

snd_pcm_oss_set_format sound/core/oss/pcm_oss.c:1878 [inline]
snd_pcm_oss_ioctl+0xbb1/0x2d20 sound/core/oss/pcm_oss.c:2642
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45e299
RSP: 002b:00007f3cf3ebbc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045e299
RDX: 0000000020000040 RSI: 00000000c0045005 RDI: 0000000000000003
RBP: 00007f3cf3ebbca0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000007
R13: 00007fffa3810def R14: 00007f3cf3ebc9c0 R15: 000000000119bf8c
CPU: 1 PID: 8044 Comm: kworker/u5:1 Not tainted 4.14.213-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: hci6 hci_power_on
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x1b2/0x283 lib/dump_stack.c:58
panic+0x1f9/0x42d kernel/panic.c:183
__warn.cold+0x20/0x4b kernel/panic.c:547
report_bug+0x208/0x249 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:177 [inline]
fixup_bug arch/x86/kernel/traps.c:172 [inline]
do_error_trap+0x195/0x2d0 arch/x86/kernel/traps.c:295
invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:964
RIP: 0010:tty_set_termios+0x708/0x810 drivers/tty/tty_ioctl.c:318
RSP: 0018:ffff888063b37b20 EFLAGS: 00010297
RAX: ffff888063b2e1c0 RBX: ffff888063b37c28 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffff888063b37c28 RDI: ffff888238f53a38
RBP: ffff888238f53a00 R08: 0000000000000000 R09: 00000000000405b1
R10: ffff888063b2ea98 R11: ffff888063b2e1c0 R12: ffff8880a9608040
R13: ffff8880a9d98d00 R14: 000000000001c200 R15: ffff88805a024798
hci_uart_set_baudrate+0x13d/0x270 drivers/bluetooth/hci_ldisc.c:389
hci_uart_setup+0x8c/0x410 drivers/bluetooth/hci_ldisc.c:412
hci_dev_do_open+0x34c/0xe30 net/bluetooth/hci_core.c:1384
hci_power_on+0x97/0x3b0 net/bluetooth/hci_core.c:2080
process_one_work+0x793/0x14a0 kernel/workqueue.c:2116
worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Kernel Offset: disabled
Rebooting in 86400 seconds..


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.