syzbot

hid-generic 0000:0000:0000.0002: unknown main item tag 0x0
hid-generic 0000:0000:0000.0002: unknown main item tag 0x0
hid-generic 0000:0000:0000.0002: unknown main item tag 0x0
hid-generic 0000:0000:0000.0002: unknown main item tag 0x0
==================================================================
BUG: KMSAN: uninit-value in mpol_dup include/linux/mempolicy.h:90 [inline]
BUG: KMSAN: uninit-value in vma_dup_policy+0xef/0x190 mm/mempolicy.c:2116
CPU: 1 PID: 15166 Comm: syz-executor.0 Not tainted 5.0.0+ #11
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+0x173/0x1d0 lib/dump_stack.c:113
 kmsan_report+0x12e/0x2a0 mm/kmsan/kmsan.c:600
 __msan_warning+0x82/0xf0 mm/kmsan/kmsan_instr.c:313
 mpol_dup include/linux/mempolicy.h:90 [inline]
 vma_dup_policy+0xef/0x190 mm/mempolicy.c:2116
 __split_vma+0x35c/0xb40 mm/mmap.c:2669
 split_vma+0x10f/0x170 mm/mmap.c:2716
 mprotect_fixup+0xe99/0x13d0 mm/mprotect.c:418
 do_mprotect_pkey+0xea1/0x1230 mm/mprotect.c:556
 __do_sys_mprotect mm/mprotect.c:581 [inline]
 __se_sys_mprotect+0x9d/0xc0 mm/mprotect.c:578
 __x64_sys_mprotect+0x4a/0x70 mm/mprotect.c:578
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x458027
Code: 00 00 00 b8 0b 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 9d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 0a 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 7d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:0000000000a4fae8 EFLAGS: 00000246 ORIG_RAX: 000000000000000a
RAX: ffffffffffffffda RBX: 0000000000020000 RCX: 0000000000458027
RDX: 0000000000000000 RSI: 0000000000001000 RDI: 00007fb8e6437000
RBP: 0000000000a4fbd0 R08: 0000000000712800 R09: 0000000000712800
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000a4fcb0
R13: 00007fb8e6457700 R14: 00007fb8e64579c0 R15: 000000000073c04c

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:205 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:220 [inline]
 kmsan_internal_chain_origin+0x134/0x230 mm/kmsan/kmsan.c:426
 kmsan_memcpy_memmove_metadata+0xcf2/0xf10 mm/kmsan/kmsan.c:304
 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:324
 __msan_memcpy+0x58/0x70 mm/kmsan/kmsan_instr.c:139
 vm_area_dup+0xbb/0x1a0 kernel/fork.c:345
 __split_vma+0x1cf/0xb40 mm/mmap.c:2658
 split_vma+0x10f/0x170 mm/mmap.c:2716
 mprotect_fixup+0xe99/0x13d0 mm/mprotect.c:418
 do_mprotect_pkey+0xea1/0x1230 mm/mprotect.c:556
 __do_sys_mprotect mm/mprotect.c:581 [inline]
 __se_sys_mprotect+0x9d/0xc0 mm/mprotect.c:578
 __x64_sys_mprotect+0x4a/0x70 mm/mprotect.c:578
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:205 [inline]
 kmsan_internal_poison_shadow+0x92/0x150 mm/kmsan/kmsan.c:159
 kmsan_kmalloc+0xa6/0x130 mm/kmsan/kmsan_hooks.c:176
 kmem_cache_alloc+0x585/0xb60 mm/slub.c:2791
 vm_area_dup+0x65/0x1a0 kernel/fork.c:342
 __split_vma+0x1cf/0xb40 mm/mmap.c:2658
 split_vma+0x10f/0x170 mm/mmap.c:2716
 mprotect_fixup+0xe99/0x13d0 mm/mprotect.c:418
 do_mprotect_pkey+0xea1/0x1230 mm/mprotect.c:556
 __do_sys_mprotect mm/mprotect.c:581 [inline]
 __se_sys_mprotect+0x9d/0xc0 mm/mprotect.c:578
 __x64_sys_mprotect+0x4a/0x70 mm/mprotect.c:578
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
==================================================================