Free swap  = 0kB
Total swap = 0kB
1965969 pages RAM
0 pages HighMem/MovableOnly
101371 pages reserved
BUG: unable to handle kernel paging request at ffffecd000003c08
PGD 0 P4D 0 
Oops: 0000 [#1] SMP PTI
CPU: 1 PID: 17627 Comm: syz-executor4 Not tainted 4.18.0-rc8+ #34
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__read_once_size include/linux/compiler.h:197 [inline]
RIP: 0010:compound_head include/linux/page-flags.h:142 [inline]
RIP: 0010:virt_to_head_page include/linux/mm.h:659 [inline]
RIP: 0010:kfree+0x368/0x29d0 mm/slub.c:3932
Code: c1 e0 05 48 b9 00 00 00 00 00 ea ff ff 48 8d 14 08 48 89 55 88 4c 8d 34 08 49 83 c6 08 4d 85 e4 45 0f 44 e8 0f 85 6c 01 00 00 <4d> 8b 3e 4c 89 f7 e8 bd 9d 02 00 48 8b 18 44 8b 0a 89 d9 83 e1 01 
RSP: 0018:ffff88003c23f358 EFLAGS: 00010246
RAX: 000002d000003c00 RBX: 0000000000000000 RCX: ffffea0000000000
RDX: ffffecd000003c00 RSI: 0000000000000000 RDI: 00000007800000a0
RBP: ffff88003c23f4b0 R08: 0000000000000000 R09: 000077ff80000000
R10: 0000000000000000 R11: ffffffff85031d70 R12: 0000000000000000
R13: 0000000000000000 R14: ffffecd000003c08 R15: 00000000000a0008
FS:  00007f656ed61700(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffecd000003c08 CR3: 000000003c268000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 kmsan_vmap+0x156/0x1e0 mm/kmsan/kmsan_hooks.c:200
 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+0x742/0x1730 kernel/relay.c:450
 relay_open+0x9ee/0x1260 kernel/relay.c:597
 do_blk_trace_setup+0x945/0x1360 kernel/trace/blktrace.c:544
 __blk_trace_setup+0x1c8/0x320 kernel/trace/blktrace.c:589
 blk_trace_ioctl+0x267/0x950 kernel/trace/blktrace.c:728
 blkdev_ioctl+0x1d40/0x55c0 block/ioctl.c:587
 block_ioctl+0x16f/0x1d0 fs/block_dev.c:1881
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0xc77/0x2670 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/0x220 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x457089
Code: Bad RIP value.
RSP: 002b:00007f656ed60c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f656ed616d4 RCX: 0000000000457089
RDX: 0000000020000580 RSI: 00000000c0481273 RDI: 0000000000000004
RBP: 0000000000930140 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004cd5c0 R14: 00000000004c3ff9 R15: 0000000000000001
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
CR2: ffffecd000003c08
---[ end trace 0f18e2781013117a ]---
RIP: 0010:__read_once_size include/linux/compiler.h:197 [inline]
RIP: 0010:compound_head include/linux/page-flags.h:142 [inline]
RIP: 0010:virt_to_head_page include/linux/mm.h:659 [inline]
RIP: 0010:kfree+0x368/0x29d0 mm/slub.c:3932
Code: c1 e0 05 48 b9 00 00 00 00 00 ea ff ff 48 8d 14 08 48 89 55 88 4c 8d 34 08 49 83 c6 08 4d 85 e4 45 0f 44 e8 0f 85 6c 01 00 00 <4d> 8b 3e 4c 89 f7 e8 bd 9d 02 00 48 8b 18 44 8b 0a 89 d9 83 e1 01 
RSP: 0018:ffff88003c23f358 EFLAGS: 00010246
RAX: 000002d000003c00 RBX: 0000000000000000 RCX: ffffea0000000000
RDX: ffffecd000003c00 RSI: 0000000000000000 RDI: 00000007800000a0
RBP: ffff88003c23f4b0 R08: 0000000000000000 R09: 000077ff80000000
R10: 0000000000000000 R11: ffffffff85031d70 R12: 0000000000000000
R13: 0000000000000000 R14: ffffecd000003c08 R15: 00000000000a0008
FS:  00007f656ed61700(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000045705f CR3: 000000003c268000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400