F2FS-fs (loop1): extra_attr or flexible_inline_xattr feature is off
WARNING: CPU: 1 PID: 22211 at sound/core/seq/seq_ports.c:276 port_delete+0x16e/0x1b0 sound/core/seq/seq_ports.c:276
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 22211 Comm: syz-executor3 Not tainted 4.18.0-rc8-next-20180810+ #36
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+0x1c9/0x2b4 lib/dump_stack.c:113
 panic+0x238/0x4e7 kernel/panic.c:184
 __warn.cold.8+0x163/0x1ba kernel/panic.c:536
 report_bug+0x252/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x1fc/0x4d0 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:996
RIP: 0010:port_delete+0x16e/0x1b0 sound/core/seq/seq_ports.c:276
Code: 00 00 31 ff 44 89 e6 e8 f0 ec 7e fc 45 85 e4 75 14 e8 d6 eb 7e fc 48 89 df e8 8e bd bd fc 31 c0 5b 41 5c 5d c3 e8 c2 eb 7e fc <0f> 0b eb e3 e8 b9 eb 7e fc 0f 0b eb 9b e8 10 e9 bd fc eb bd e8 09
RSP: 0018:ffff88019346f8d8 EFLAGS: 00010293
RAX: ffff8801d92e4480 RBX: ffff8801b3d1d240 RCX: ffffffff84fe4250
RDX: 0000000000000000 RSI: ffffffff84fe426e RDI: 0000000000000005
RBP: ffff88019346f8e8 R08: ffff8801d92e4480 R09: 0000000000000006
R10: ffff8801d92e4480 R11: 0000000000000000 R12: 0000000000000002
R13: ffff8801b3d1d290 R14: 1ffff1003268df29 R15: ffff8801d9364950
 snd_seq_delete_port+0x3cb/0x4a0 sound/core/seq/seq_ports.c:303
 snd_seq_ioctl_delete_port+0xba/0x190 sound/core/seq/seq_clientmgr.c:1324
 snd_seq_kernel_client_ctl+0x15a/0x190 sound/core/seq/seq_clientmgr.c:2353
 snd_seq_event_port_detach+0xfb/0x160 sound/core/seq/seq_ports.c:705
 delete_port+0x7d/0xc0 sound/core/seq/oss/seq_oss_init.c:354
 snd_seq_oss_release+0xf2/0x130 sound/core/seq/oss/seq_oss_init.c:433
 odev_release+0x52/0x70 sound/core/seq/oss/seq_oss.c:153
 __fput+0x376/0x8a0 fs/file_table.c:279
 ____fput+0x15/0x20 fs/file_table.c:312
 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:193 [inline]
 exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
 do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x410c41
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 34 19 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffc1e31acb0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000008 RCX: 0000000000410c41
RDX: 0000000000000000 RSI: 0000000000733b30 RDI: 0000000000000007
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffffffffffff
R10: 00000000009300a0 R11: 0000000000000293 R12: 0000000000000002
R13: 00000000000717f2 R14: 0000000000000194 R15: badc0ffeebadface
Dumping ftrace buffer:
---------------------------------
syz-exec-9966    1...2 219846721us : 0: }D
---------------------------------
Kernel Offset: disabled
Rebooting in 86400 seconds..