kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 29590 Comm: syz-executor.5 Not tainted 5.1.0-rc6+ #85
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 a1 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 dc
RSP: 0018:ffff88805c7c79b8 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: dffffc0000000000 RCX: ffffc9001088c000
RDX: 0000000020000015 RSI: ffffffff81716f4f RDI: 00000001000000ab
RBP: ffff88805c7c79c8 R08: ffff888056c60640 R09: ffffed100b8f8f0e
R10: ffffed100b8f8f0d R11: 0000000000000003 R12: 00000000ffffffff
R13: ffff8880a85795c0 R14: 0000000000000007 R15: 00000000ffffffff
FS:  00007f868cbf2700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f868cbafdb8 CR3: 000000008d664000 CR4: 00000000001426e0
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+0x414/0xb90 kernel/trace/blktrace.c:532
 __blk_trace_setup+0xe3/0x190 kernel/trace/blktrace.c:577
 blk_trace_setup+0x4f/0x70 kernel/trace/blktrace.c:595
 sg_ioctl+0x6a2/0x2b20 drivers/scsi/sg.c:1117
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0xd6e/0x1390 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+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x458d99
Code: ad b8 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 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f868cbf1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458d99
RDX: 0000000020000080 RSI: 00000000c0481273 RDI: 0000000000000006
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f868cbf26d4
R13: 00000000004c0265 R14: 00000000004d2658 R15: 00000000ffffffff
Modules linked in:
---[ end trace 3bde2fbe8a3ef9bf ]---
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 a1 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 dc
RSP: 0018:ffff88805c7c79b8 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: dffffc0000000000 RCX: ffffc9001088c000
RDX: 0000000020000015 RSI: ffffffff81716f4f RDI: 00000001000000ab
RBP: ffff88805c7c79c8 R08: ffff888056c60640 R09: ffffed100b8f8f0e
R10: ffffed100b8f8f0d R11: 0000000000000003 R12: 00000000ffffffff
R13: ffff8880a85795c0 R14: 0000000000000007 R15: 00000000ffffffff
FS:  00007f868cbf2700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff0794afc8 CR3: 000000008d664000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400