------------[ cut here ]------------
kmsan_get_shadow_address_inline(fffffe0000016f08, 8, 1)
WARNING: CPU: 0 PID: 6955 at mm/kmsan/kmsan_instr.c:153 kmsan_get_shadow_address_inline+0x192/0x2e0 mm/kmsan/kmsan_instr.c:153
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 6955 Comm: syz-executor5 Not tainted 4.17.0+ #16
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <#DB>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:113
 panic+0x3d0/0x990 kernel/panic.c:184
 __warn+0x40f/0x580 kernel/panic.c:536
 report_bug+0x72a/0x880 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:179 [inline]
 do_error_trap+0x1c1/0x620 arch/x86/kernel/traps.c:298
 do_invalid_op+0x46/0x50 arch/x86/kernel/traps.c:317
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:997
RIP: 0010:kmsan_get_shadow_address_inline+0x192/0x2e0 mm/kmsan/kmsan_instr.c:153
RSP: 0018:fffffe0000016da8 EFLAGS: 00010082
RAX: 0000000000000037 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffffc900045af000 RSI: 000000000000104f RDI: 0000000000001050
RBP: fffffe0000016df0 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: ffffffff86576dc0 R12: 0000000000000000
R13: 0000000000000001 R14: 0000000000000008 R15: ffff88012bf0ba80
 __msan_poison_alloca+0xa7/0x1d0 mm/kmsan/kmsan_instr.c:582
 do_debug+0x5b/0x800 arch/x86/kernel/traps.c:723
 debug+0x28/0x50 arch/x86/entry/entry_64.S:1156
RIP: 0010:copy_user_generic_unrolled+0x8c/0xc0 arch/x86/lib/copy_user_64.S:67
RSP: 0018:ffff88012785fa28 EFLAGS: 00000206
RAX: ffffffff83fc918f RBX: ffff88000b51f000 RCX: 0000000000000006
RDX: 0000000000000000 RSI: ffff88000b51f000 RDI: 0000000020000000
RBP: ffff88012785fb40 R08: 0000000000000000 R09: 0000000000000002
R10: ffffea000043eba0 R11: ffffffff81a00b00 R12: 0000000000000000
R13: 0000000000000030 R14: 0000000020000000 R15: 0000000000000000
 </#DB>
 shmem_file_read_iter+0x99f/0x1180 mm/shmem.c:2521
 call_read_iter include/linux/fs.h:1778 [inline]
 new_sync_read fs/read_write.c:406 [inline]
 __vfs_read+0x775/0x9d0 fs/read_write.c:418
 vfs_read+0x36c/0x6b0 fs/read_write.c:452
 ksys_read fs/read_write.c:578 [inline]
 __do_sys_read fs/read_write.c:588 [inline]
 __se_sys_read fs/read_write.c:586 [inline]
 __x64_sys_read+0x1bf/0x3e0 fs/read_write.c:586
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x455ab9
RSP: 002b:00007f0d6f5bfc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f0d6f5c06d4 RCX: 0000000000455ab9
RDX: 0000000000000030 RSI: 0000000020000000 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004bfe4c R14: 00000000004d0378 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..