RAX: ffffffffffffffda RBX: 00007fefc39606d4 RCX: 0000000000455ab9
RDX: 0000000020000180 RSI: 00000000c0481273 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000016
R13: 00000000004bc7c4 R14: 00000000004caea0 R15: 000000000000002e
BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
PGD 8000000100c0f067 P4D 8000000100c0f067 PUD 100c0c067 PMD 0 
Oops: 0000 [#1] SMP PTI
CPU: 1 PID: 20260 Comm: syz-executor7 Not tainted 4.18.0-rc5+ #29
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:map_vm_area+0x69/0x1f0 mm/vmalloc.c:1340
Code: 08 48 89 45 a0 41 8b 84 24 90 0c 00 00 89 45 cc 45 8b bc 24 88 0c 00 00 e8 c4 44 b3 ff 4d 8d 75 08 48 85 db 0f 85 5b 01 00 00 <49> 8b 45 08 48 89 45 a8 4c 89 f7 e8 47 ef 0e 00 4d 8d 75 18 48 8b 
RSP: 0018:ffff88010680f658 EFLAGS: 00010046
RAX: ffffffff81b4e03c RBX: 0000000000000000 RCX: 0000000000040000
RDX: ffffc900027a0000 RSI: 0000000000031864 RDI: 0000000000031865
RBP: ffff88010680f6d0 R08: 00000000004000c0 R09: ffff88021fd39090
R10: 0000000000000002 R11: 0000000000000000 R12: ffff88021fd39090
R13: 0000000000000000 R14: 0000000000000008 R15: 0000000000000000
FS:  00007fefc3960700(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000008 CR3: 0000000106a52000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 kmsan_vmap+0x134/0x200 mm/kmsan/kmsan_hooks.c:181
 vmap+0x3b2/0x540 mm/vmalloc.c:1648
 relay_alloc_buf kernel/relay.c:141 [inline]
 relay_create_buf kernel/relay.c:177 [inline]
 relay_open_buf+0x8ed/0x17f0 kernel/relay.c:450
 relay_open+0xa72/0x12d0 kernel/relay.c:597
 do_blk_trace_setup+0x950/0x1410 kernel/trace/blktrace.c:544
 __blk_trace_setup+0x20f/0x380 kernel/trace/blktrace.c:589
 blk_trace_setup+0xfb/0x140 kernel/trace/blktrace.c:607
 sg_ioctl+0xcef/0x4ea0 drivers/scsi/sg.c:1126
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0xdef/0x2740 fs/ioctl.c:686
 ksys_ioctl fs/ioctl.c:701 [inline]
 __do_sys_ioctl fs/ioctl.c:708 [inline]
 __se_sys_ioctl fs/ioctl.c:706 [inline]
 __x64_sys_ioctl+0x280/0x320 fs/ioctl.c:706
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x455ab9
Code: 1d ba 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 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 
RSP: 002b:00007fefc395fc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fefc39606d4 RCX: 0000000000455ab9
RDX: 0000000020000180 RSI: 00000000c0481273 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000016
R13: 00000000004bc7c4 R14: 00000000004caea0 R15: 000000000000002e
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
CR2: 0000000000000008
---[ end trace cd1419a6ed6a84c2 ]---
RIP: 0010:map_vm_area+0x69/0x1f0 mm/vmalloc.c:1340
Code: 08 48 89 45 a0 41 8b 84 24 90 0c 00 00 89 45 cc 45 8b bc 24 88 0c 00 00 e8 c4 44 b3 ff 4d 8d 75 08 48 85 db 0f 85 5b 01 00 00 <49> 8b 45 08 48 89 45 a8 4c 89 f7 e8 47 ef 0e 00 4d 8d 75 18 48 8b 
RSP: 0018:ffff88010680f658 EFLAGS: 00010046
RAX: ffffffff81b4e03c RBX: 0000000000000000 RCX: 0000000000040000
RDX: ffffc900027a0000 RSI: 0000000000031864 RDI: 0000000000031865
RBP: ffff88010680f6d0 R08: 00000000004000c0 R09: ffff88021fd39090
R10: 0000000000000002 R11: 0000000000000000 R12: ffff88021fd39090
R13: 0000000000000000 R14: 0000000000000008 R15: 0000000000000000
FS:  00007fefc3960700(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000008 CR3: 0000000106a52000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400