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BUG: KMSAN: uninit-value in do_error_trap+0x39b/0x600 arch/x86/kernel/traps.c:297
CPU: 1 PID: 9459 Comm: syz-executor6 Not tainted 4.17.0-rc3+ #90
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:113
 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:683
 do_error_trap+0x39b/0x600 arch/x86/kernel/traps.c:297
 do_invalid_op+0x46/0x50 arch/x86/kernel/traps.c:316
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992
RIP: 0010:kmsan_copy_to_user+0x141/0x160 mm/kmsan/kmsan.c:1213
RSP: 0018:ffff8801bd8cfb88 EFLAGS: 00010202
RAX: ffff8801c7c60000 RBX: ffff8801b0775f20 RCX: 0000000000000004
RDX: 00007ffffffff000 RSI: ffff8801b0775f20 RDI: fffffffffffffffe
RBP: ffff8801bd8cfbd0 R08: 0000000001080020 R09: ffff8801687acf20
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004
R13: fffffffffffffffe R14: 0000000000000000 R15: 0000000000000000
 copy_to_user include/linux/uaccess.h:184 [inline]
 old_deviceless net/bridge/br_ioctl.c:328 [inline]
 br_ioctl_deviceless_stub+0xb8e/0xc20 net/bridge/br_ioctl.c:363
 sock_ioctl+0x8a2/0xca0 net/socket.c:1048
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0xaf0/0x2440 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+0x154/0x220 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x455a39
RSP: 002b:00007fb9b15c4c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fb9b15c56d4 RCX: 0000000000455a39
RDX: 0000000020000080 RSI: 0000000000008941 RDI: 0000000000000014
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000041a R14: 00000000006fa310 R15: 0000000000000000

Local variable description: ----flags.i.i.i.i.i.i@kmem_cache_alloc
Variable was created at:
 kmem_cache_alloc+0x7a/0xb90 mm/slub.c:2764
 kmem_cache_zalloc include/linux/slab.h:691 [inline]
 get_empty_filp+0x1f1/0x870 fs/file_table.c:122
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