=====================================================
BUG: KMSAN: uninit-value in __mpol_equal+0x640/0x6b0 mm/mempolicy.c:2335
 __mpol_equal+0x640/0x6b0 mm/mempolicy.c:2335
 mpol_equal include/linux/mempolicy.h:108 [inline]
 vma_merge+0x4a1/0x1e60 mm/mmap.c:1193
 mbind_range+0xdc5/0x2100 mm/mempolicy.c:830
 do_mbind+0xf4f/0x15a0 mm/mempolicy.c:1352
 kernel_mbind mm/mempolicy.c:1482 [inline]
 __do_sys_mbind mm/mempolicy.c:1489 [inline]
 __se_sys_mbind mm/mempolicy.c:1485 [inline]
 __x64_sys_mbind+0x473/0x4f0 mm/mempolicy.c:1485
 do_syscall_64+0x55/0xc0 arch/x86/entry/common.c:49
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/core.c:78 [inline]
 kmsan_internal_poison_memory+0x56/0xc0 mm/kmsan/core.c:63
 kmsan_slab_alloc+0xf5/0x160 mm/kmsan/hooks.c:73
 slab_alloc_node mm/slub.c:2929 [inline]
 slab_alloc mm/slub.c:2938 [inline]
 kmem_cache_alloc+0x70e/0x1050 mm/slub.c:2943
 mpol_new mm/mempolicy.c:302 [inline]
 do_mbind+0x8d5/0x15a0 mm/mempolicy.c:1308
 kernel_mbind mm/mempolicy.c:1482 [inline]
 __do_sys_mbind mm/mempolicy.c:1489 [inline]
 __se_sys_mbind mm/mempolicy.c:1485 [inline]
 __x64_sys_mbind+0x473/0x4f0 mm/mempolicy.c:1485
 do_syscall_64+0x55/0xc0 arch/x86/entry/common.c:49
 entry_SYSCALL_64_after_hwframe+0x44/0xae
=====================================================
Kernel panic - not syncing: panic_on_kmsan set ...
CPU: 0 PID: 15314 Comm: syz-executor.4 Tainted: G    B             5.13.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x25a/0x2f6 lib/dump_stack.c:120
 panic+0x4c7/0xe98 kernel/panic.c:231
 kmsan_report+0x2ee/0x300 mm/kmsan/report.c:179
 __msan_warning+0xd7/0x150 mm/kmsan/instrumentation.c:208
 __mpol_equal+0x640/0x6b0 mm/mempolicy.c:2335
 mpol_equal include/linux/mempolicy.h:108 [inline]
 vma_merge+0x4a1/0x1e60 mm/mmap.c:1193
 mbind_range+0xdc5/0x2100 mm/mempolicy.c:830
 do_mbind+0xf4f/0x15a0 mm/mempolicy.c:1352
 kernel_mbind mm/mempolicy.c:1482 [inline]
 __do_sys_mbind mm/mempolicy.c:1489 [inline]
 __se_sys_mbind mm/mempolicy.c:1485 [inline]
 __x64_sys_mbind+0x473/0x4f0 mm/mempolicy.c:1485
 do_syscall_64+0x55/0xc0 arch/x86/entry/common.c:49
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f069a1f7739
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f069776e188 EFLAGS: 00000246 ORIG_RAX: 00000000000000ed
RAX: ffffffffffffffda RBX: 00007f069a2fbf80 RCX: 00007f069a1f7739
RDX: 0000000000002001 RSI: 0000000000c00000 RDI: 0000000020012000
RBP: 00007f069a251cc4 R08: 0000000000000000 R09: 0000010000000002
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f069a2fbf80
R13: 00007f069a82fb1f R14: 00007f069776e300 R15: 0000000000022000
Kernel Offset: disabled
Rebooting in 86400 seconds..