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: 1 PID: 15787 Comm: syz-executor0 Not tainted 4.20.0-rc4+ #350
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:relay_switch_subbuf+0x27e/0xa70 kernel/relay.c:753
Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 a4 07 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 73 58 49 8d 7e 50 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 8b 07 00 00 48 ba 00 00 00 00 00 fc ff df 4d 8b
RSP: 0018:ffff8881c1e37618 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffff88816dcf2040 RCX: ffffc900067eb000
RDX: 000000000000000a RSI: ffffffff81803c36 RDI: 0000000000000050
RBP: ffff8881c1e376d8 R08: ffff8881c9722340 R09: fffffbfff12b9d74
R10: ffff8881c1e376d8 R11: ffffffff895ceba7 R12: ffff8881d8136cc0
R13: ffff8881c48f3b40 R14: 0000000000000000 R15: 0000000000000000
FS:  00007fadebca7700(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kobject: 'loop2' (0000000014691c01): kobject_uevent_env
CR2: 00007ffd9e7d53d8 CR3: 0000000184761000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
kobject: 'loop2' (0000000014691c01): fill_kobj_path: path = '/devices/virtual/block/loop2'
 relay_flush+0x1c6/0x280 kernel/relay.c:881
 __blk_trace_startstop.isra.21+0x2ae/0x8c0 kernel/trace/blktrace.c:668
 blk_trace_ioctl+0x226/0x2f0 kernel/trace/blktrace.c:727
 blkdev_ioctl+0x9e9/0x21b0 block/ioctl.c:591
 block_ioctl+0xee/0x130 fs/block_dev.c:1883
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0x1de/0x1790 fs/ioctl.c:696
 ksys_ioctl+0xa9/0xd0 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+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457569
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:00007fadebca6c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569
RDX: 0000000000000000 RSI: 0000000000001275 RDI: 000000000000000d
RBP: 000000000072c220 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fadebca76d4
R13: 00000000004beab7 R14: 00000000004cf0f8 R15: 00000000ffffffff
Modules linked in:
---[ end trace f478b9d0456ec9fa ]---
RIP: 0010:relay_switch_subbuf+0x27e/0xa70 kernel/relay.c:753
Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 a4 07 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 73 58 49 8d 7e 50 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 8b 07 00 00 48 ba 00 00 00 00 00 fc ff df 4d 8b
kobject: 'loop5' (00000000d93e76ac): kobject_uevent_env
RSP: 0018:ffff8881c1e37618 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffff88816dcf2040 RCX: ffffc900067eb000
RDX: 000000000000000a RSI: ffffffff81803c36 RDI: 0000000000000050
RBP: ffff8881c1e376d8 R08: ffff8881c9722340 R09: fffffbfff12b9d74
kobject: 'loop5' (00000000d93e76ac): fill_kobj_path: path = '/devices/virtual/block/loop5'
R10: ffff8881c1e376d8 R11: ffffffff895ceba7 R12: ffff8881d8136cc0
kobject: 'loop4' (0000000091c102b1): kobject_uevent_env
R13: ffff8881c48f3b40 R14: 0000000000000000 R15: 0000000000000000
kobject: 'loop4' (0000000091c102b1): fill_kobj_path: path = '/devices/virtual/block/loop4'
FS:  00007fadebca7700(0000) GS:ffff8881dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kobject: 'loop1' (000000009f75c649): kobject_uevent_env
kobject: 'loop1' (000000009f75c649): fill_kobj_path: path = '/devices/virtual/block/loop1'
CR2: 00007fba25051000 CR3: 0000000184761000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400