0 pages HighMem/MovableOnly
106559 pages reserved
BUG: unable to handle kernel NULL pointer dereference at 00000000000008d4
PGD 80000001bfaa2067 P4D 80000001bfaa2067 PUD 1924e7067 PMD 0 
Oops: 0002 [#1] SMP PTI
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 31592 Comm: syz-executor5 Not tainted 4.17.0+ #22
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:memset_erms+0x9/0x10 arch/x86/lib/memset_64.S:65
RSP: 0018:ffff880023fcf5e8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: fffffffffffffff4 RCX: 0000000000000fb0
RDX: 0000000000000fb0 RSI: 0000000000000000 RDI: 00000000000008d4
RBP: ffff880023fcf5f8 R08: 000000018040002f R09: 00000000000008d4
R10: 0000000000000000 R11: 000000018040002f R12: ffff88004cff4360
R13: 0000000000000000 R14: 0000000000000282 R15: fffffffffffffff4
FS:  00007fafc2990700(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000000008d4 CR3: 0000000022ea6000 CR4: 00000000001406f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 kmsan_thread_create+0x4b/0x90 mm/kmsan/kmsan_hooks.c:30
 __kthread_create_on_node+0x6ba/0x7b0 kernel/kthread.c:333
 kthread_create_on_node+0x243/0x270 kernel/kthread.c:369
 loop_prepare_queue drivers/block/loop.c:869 [inline]
 loop_set_fd drivers/block/loop.c:930 [inline]
 lo_ioctl+0x3163/0x4450 drivers/block/loop.c:1398
 __blkdev_driver_ioctl block/ioctl.c:303 [inline]
 blkdev_ioctl+0x2290/0x4f80 block/ioctl.c:601
 block_ioctl+0x16f/0x1d0 fs/block_dev.c:1877
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0xcbd/0x24b0 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:287
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x455ba9
RSP: 002b:00007fafc298fc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fafc29906d4 RCX: 0000000000455ba9
RDX: 0000000000000014 RSI: 0000000000004c00 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004be0a6 R14: 00000000004cc700 R15: 0000000000000000
Code: 48 c1 e9 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 f3 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 <f3> aa 4c 89 c8 c3 90 49 89 fa 40 0f b6 ce 48 b8 01 01 01 01 01 
RIP: memset_erms+0x9/0x10 arch/x86/lib/memset_64.S:65 RSP: ffff880023fcf5e8
CR2: 00000000000008d4
---[ end trace f73eafae1cd2586a ]---