=====================================================
BUG: KMSAN: uninit-value in is_folio_zero_filled mm/page_io.c:189 [inline]
BUG: KMSAN: uninit-value in swap_writepage+0x546/0x17f0 mm/page_io.c:267
 is_folio_zero_filled mm/page_io.c:189 [inline]
 swap_writepage+0x546/0x17f0 mm/page_io.c:267
 shmem_writepage+0x2117/0x2450 mm/shmem.c:1572
 pageout mm/vmscan.c:689 [inline]
 shrink_folio_list+0x5e7f/0x7dd0 mm/vmscan.c:1367
 evict_folios+0x9813/0xbaf0 mm/vmscan.c:4589
 try_to_shrink_lruvec+0x13a3/0x1750 mm/vmscan.c:4784
 shrink_one+0x646/0xd20 mm/vmscan.c:4822
 shrink_many mm/vmscan.c:4885 [inline]
 lru_gen_shrink_node mm/vmscan.c:4963 [inline]
 shrink_node+0x451b/0x5170 mm/vmscan.c:5943
 kswapd_shrink_node mm/vmscan.c:6771 [inline]
 balance_pgdat mm/vmscan.c:6963 [inline]
 kswapd+0x25e8/0x42f0 mm/vmscan.c:7232
 kthread+0x3e2/0x540 kernel/kthread.c:389
 ret_from_fork+0x6d/0x90 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Uninit was created at:
 __alloc_pages_noprof+0x9a7/0xe00 mm/page_alloc.c:4774
 alloc_pages_mpol_noprof+0x299/0x990 mm/mempolicy.c:2265
 folio_alloc_mpol_noprof+0x55/0x180 mm/mempolicy.c:2283
 shmem_alloc_folio mm/shmem.c:1774 [inline]
 shmem_alloc_and_add_folio+0xc33/0x1c30 mm/shmem.c:1813
 shmem_get_folio_gfp+0xacd/0x1f30 mm/shmem.c:2335
 shmem_get_folio mm/shmem.c:2441 [inline]
 shmem_symlink+0x521/0xaa0 mm/shmem.c:3901
 vfs_symlink+0x1ed/0x460 fs/namei.c:4669
 do_symlinkat+0x253/0x8b0 fs/namei.c:4695
 __do_sys_symlink fs/namei.c:4716 [inline]
 __se_sys_symlink fs/namei.c:4714 [inline]
 __ia32_sys_symlink+0xd0/0x130 fs/namei.c:4714
 ia32_sys_call+0x2178/0x4180 arch/x86/include/generated/asm/syscalls_32.h:84
 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
 __do_fast_syscall_32+0xb0/0x110 arch/x86/entry/common.c:386
 do_fast_syscall_32+0x38/0x80 arch/x86/entry/common.c:411
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:449
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

CPU: 0 UID: 0 PID: 81 Comm: kswapd0 Not tainted 6.12.0-syzkaller-00239-gc6d64479d609 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
=====================================================