debugfs: File 'dropped' in directory 'loop0' already present!
debugfs: File 'msg' in directory 'loop0' already present!
debugfs: File 'trace0' in directory 'loop0' already present!
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 13426 Comm: syz-executor.5 Not tainted 5.3.0-rc2+ #113
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:relay_close_buf+0x28/0x150 kernel/relay.c:495
Code: 00 00 55 48 89 e5 41 54 49 89 fc 53 e8 71 1d ff ff 49 8d bc 24 ac 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 d9
RSP: 0018:ffff888031d97920 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: dffffc0000000000 RCX: ffffc90010bdf000
RDX: 0000000020000015 RSI: ffffffff817381ef RDI: 00000001000000ab
RBP: ffff888031d97930 R08: ffff8880985c8480 R09: ffffed10063b2efb
R10: ffffed10063b2efa R11: 0000000000000003 R12: 00000000ffffffff
R13: ffff88808ee82340 R14: 0000000000000007 R15: 00000000ffffffff
FS:  00007fe81c4bd700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000402e9d CR3: 0000000091999000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 relay_open kernel/relay.c:612 [inline]
 relay_open+0x619/0x980 kernel/relay.c:563
 do_blk_trace_setup+0x3f0/0xb50 kernel/trace/blktrace.c:526
 __blk_trace_setup+0xe3/0x190 kernel/trace/blktrace.c:571
 blk_trace_ioctl+0x170/0x300 kernel/trace/blktrace.c:710
 blkdev_ioctl+0x126/0x1c1a block/ioctl.c:592
 block_ioctl+0xee/0x130 fs/block_dev.c:1960
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:696
 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459829
Code: fd b7 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 b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fe81c4bcc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459829
RDX: 0000000020000080 RSI: 00000000c0481273 RDI: 0000000000000004
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe81c4bd6d4
R13: 00000000004c0ed9 R14: 00000000004d3ff0 R15: 00000000ffffffff
Modules linked in:
---[ end trace 3d71c02e07728bef ]---
RIP: 0010:relay_close_buf+0x28/0x150 kernel/relay.c:495
Code: 00 00 55 48 89 e5 41 54 49 89 fc 53 e8 71 1d ff ff 49 8d bc 24 ac 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 d9
RSP: 0018:ffff888031d97920 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: dffffc0000000000 RCX: ffffc90010bdf000
RDX: 0000000020000015 RSI: ffffffff817381ef RDI: 00000001000000ab
RBP: ffff888031d97930 R08: ffff8880985c8480 R09: ffffed10063b2efb
R10: ffffed10063b2efa R11: 0000000000000003 R12: 00000000ffffffff
R13: ffff88808ee82340 R14: 0000000000000007 R15: 00000000ffffffff
FS:  00007fe81c4bd700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f423000 CR3: 0000000091999000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400