WARNING: CPU: 0 PID: 8091 at sound/core/seq/seq_ports.c:276 port_delete+0x16e/0x1b0 sound/core/seq/seq_ports.c:276
kobject: 'loop3' (000000000be29f03): kobject_uevent_env
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 8091 Comm: syz-executor0 Not tainted 4.20.0 #165
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+0x1d3/0x2c6 lib/dump_stack.c:113
kobject: 'loop3' (000000000be29f03): fill_kobj_path: path = '/devices/virtual/block/loop3'
 panic+0x2ad/0x55c kernel/panic.c:188
 __warn.cold.8+0x20/0x45 kernel/panic.c:540
 report_bug+0x254/0x2d0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973
kobject: 'loop2' (0000000006163229): kobject_uevent_env
RIP: 0010:port_delete+0x16e/0x1b0 sound/core/seq/seq_ports.c:276
Code: 00 00 31 ff 44 89 e6 e8 20 37 79 fb 45 85 e4 75 14 e8 06 36 79 fb 48 89 df e8 ae 13 bc fb 31 c0 5b 41 5c 5d c3 e8 f2 35 79 fb <0f> 0b eb e3 e8 e9 35 79 fb 0f 0b eb 9b e8 70 3f bc fb eb bd e8 69
RSP: 0018:ffff8881b99af890 EFLAGS: 00010212
RAX: 0000000000040000 RBX: ffff8881bc588dc0 RCX: ffffc90005dd6000
RDX: 00000000000088d6 RSI: ffffffff860581ee RDI: 0000000000000005
kobject: 'loop2' (0000000006163229): fill_kobj_path: path = '/devices/virtual/block/loop2'
RBP: ffff8881b99af8a0 R08: ffff8881c30d64c0 R09: 0000000000000006
R10: 0000000000000000 R11: ffff8881c30d64c0 R12: 0000000000000001
R13: ffff8881bc588e10 R14: 1ffff11037335f20 R15: ffff8881c6339600
 snd_seq_delete_port+0x3cb/0x4a0 sound/core/seq/seq_ports.c:303
kobject: 'loop4' (0000000011de367f): kobject_uevent_env
kobject: 'loop4' (0000000011de367f): fill_kobj_path: path = '/devices/virtual/block/loop4'
 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+0xfc/0x170 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+0x385/0xa30 fs/file_table.c:278
 ____fput+0x15/0x20 fs/file_table.c:309
 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [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: 0033:0x457669
Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fe95ab54c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffea RBX: 0000000000000004 RCX: 0000000000457669
RDX: 0000000000004100 RSI: 0000000020000040 RDI: ffffffffffffff9c
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe95ab556d4
R13: 00000000004c33c2 R14: 00000000004d5b98 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..