=====================================================
BUG: KMSAN: uninit-value in mpol_rebind_policy mm/mempolicy.c:355 [inline]
BUG: KMSAN: uninit-value in mpol_rebind_mm+0x35b/0x460 mm/mempolicy.c:386
 mpol_rebind_policy mm/mempolicy.c:355 [inline]
 mpol_rebind_mm+0x35b/0x460 mm/mempolicy.c:386
 cpuset_attach+0xe28/0x15e0 kernel/cgroup/cpuset.c:2320
 cgroup_migrate_execute+0x1023/0x1d20 kernel/cgroup/cgroup.c:2516
 cgroup_migrate kernel/cgroup/cgroup.c:2772 [inline]
 cgroup_attach_task+0x540/0x8b0 kernel/cgroup/cgroup.c:2805
 __cgroup1_procs_write+0x5f2/0x7e0 kernel/cgroup/cgroup-v1.c:523
 cgroup1_procs_write+0x97/0xb0 kernel/cgroup/cgroup-v1.c:536
 cgroup_file_write+0x4d0/0x9f0 kernel/cgroup/cgroup.c:3882
 kernfs_fop_write_iter+0x66a/0x9f0 fs/kernfs/file.c:296
 call_write_iter include/linux/fs.h:2074 [inline]
 new_sync_write fs/read_write.c:503 [inline]
 vfs_write+0x1318/0x2030 fs/read_write.c:590
 ksys_write+0x28b/0x510 fs/read_write.c:643
 __do_sys_write fs/read_write.c:655 [inline]
 __se_sys_write fs/read_write.c:652 [inline]
 __x64_sys_write+0xdb/0x120 fs/read_write.c:652
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Uninit was stored to memory at:
 __mpol_dup+0x107/0x480 mm/mempolicy.c:2406
 mpol_dup include/linux/mempolicy.h:88 [inline]
 vma_replace_policy mm/mempolicy.c:765 [inline]
 mbind_range+0x1859/0x1fb0 mm/mempolicy.c:837
 do_mbind+0x1401/0x1b60 mm/mempolicy.c:1327
 kernel_mbind mm/mempolicy.c:1481 [inline]
 __do_sys_mbind mm/mempolicy.c:1559 [inline]
 __se_sys_mbind+0x51c/0xc80 mm/mempolicy.c:1555
 __x64_sys_mbind+0x19d/0x200 mm/mempolicy.c:1555
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Uninit was created at:
 slab_post_alloc_hook mm/slab.h:737 [inline]
 slab_alloc_node mm/slub.c:3247 [inline]
 slab_alloc mm/slub.c:3255 [inline]
 kmem_cache_alloc+0x902/0x11c0 mm/slub.c:3260
 mpol_new mm/mempolicy.c:295 [inline]
 do_mbind+0x8f5/0x1b60 mm/mempolicy.c:1283
 kernel_mbind mm/mempolicy.c:1481 [inline]
 __do_sys_mbind mm/mempolicy.c:1559 [inline]
 __se_sys_mbind+0x51c/0xc80 mm/mempolicy.c:1555
 __x64_sys_mbind+0x19d/0x200 mm/mempolicy.c:1555
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x44/0xae

CPU: 1 PID: 7706 Comm: syz-executor.2 Not tainted 5.17.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
=====================================================