BUG: Bad page state in process udevd pfn:12b937 page:000000005ab178f4 refcount:0 mapcount:0 mapping:0000000000000000 index:0x4 pfn:0x12b937 flags: 0x5ffc00000002006(referenced|uptodate|private|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000002006 fffffc0003ae49c8 ffff80001f7a6ee0 0000000000000000 raw: 0000000000000004 ffff0000ed72f9b0 00000000ffffffff 0000000000000000 page dumped because: PAGE_FLAGS_CHECK_AT_FREE flag(s) set Modules linked in: CPU: 1 PID: 4746 Comm: udevd Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/02/2026 Call trace: dump_backtrace+0x0/0x458 arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 bad_page+0x188/0x1a8 mm/page_alloc.c:652 check_free_page_bad+0xf4/0x16c mm/page_alloc.c:1199 check_free_page mm/page_alloc.c:1209 [inline] free_pages_prepare mm/page_alloc.c:1334 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0x748/0xa94 mm/page_alloc.c:3317 free_unref_page_list+0xdc/0x740 mm/page_alloc.c:3433 release_pages+0x13a0/0x16c0 mm/swap.c:963 __pagevec_lru_add+0x1290/0x1598 mm/swap.c:1056 lru_cache_add+0x470/0x6dc mm/swap.c:453 lru_cache_add_inactive_or_unevictable+0x130/0x2f0 mm/swap.c:484 do_anonymous_page mm/memory.c:3878 [inline] handle_pte_fault mm/memory.c:4648 [inline] __handle_mm_fault mm/memory.c:4785 [inline] handle_mm_fault+0x23a8/0x2aac mm/memory.c:4883 __do_page_fault arch/arm64/mm/fault.c:505 [inline] do_page_fault+0x690/0xad0 arch/arm64/mm/fault.c:605 do_translation_fault+0xe0/0x130 arch/arm64/mm/fault.c:686 do_mem_abort+0x6c/0x1b0 arch/arm64/mm/fault.c:820 el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:358 el1h_64_sync_handler+0x50/0xac arch/arm64/kernel/entry-common.c:418 el1h_64_sync+0x78/0x7c arch/arm64/kernel/entry.S:522 __arch_copy_to_user+0x190/0x218 arch/arm64/lib/copy_template.S:158 filemap_read+0x13d4/0x1884 mm/filemap.c:2698 generic_file_read_iter+0xf4/0x53c mm/filemap.c:2794 blkdev_read_iter+0x134/0x174 block/fops.c:563 call_read_iter include/linux/fs.h:2167 [inline] new_sync_read fs/read_write.c:404 [inline] vfs_read+0x58c/0xa4c fs/read_write.c:485 ksys_read+0x12c/0x228 fs/read_write.c:623 __do_sys_read fs/read_write.c:633 [inline] __se_sys_read fs/read_write.c:631 [inline] __arm64_sys_read+0x7c/0x90 fs/read_write.c:631 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x28c arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x5c/0x140 arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1d0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 BUG: Bad page state in process udevd pfn:119cf5 page:000000004a22cc90 refcount:0 mapcount:0 mapping:0000000000000000 index:0x4 pfn:0x119cf5 flags: 0x5ffc00000002006(referenced|uptodate|private|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000002006 fffffc000339a888 ffff80001f7a7220 0000000000000000 raw: 0000000000000004 ffff0000d24279b0 00000000ffffffff 0000000000000000 page dumped because: PAGE_FLAGS_CHECK_AT_FREE flag(s) set Modules linked in: CPU: 0 PID: 4746 Comm: udevd Tainted: G B syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/02/2026 Call trace: dump_backtrace+0x0/0x458 arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 bad_page+0x188/0x1a8 mm/page_alloc.c:652 check_free_page_bad+0xf4/0x16c mm/page_alloc.c:1199 check_free_page mm/page_alloc.c:1209 [inline] free_pages_prepare mm/page_alloc.c:1334 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0x748/0xa94 mm/page_alloc.c:3317 free_unref_page_list+0xdc/0x740 mm/page_alloc.c:3433 release_pages+0x13a0/0x16c0 mm/swap.c:963 __pagevec_lru_add+0x1290/0x1598 mm/swap.c:1056 lru_add_drain_cpu+0xbc/0x5a8 mm/swap.c:597 lru_add_drain+0x8c/0x164 mm/swap.c:701 __pagevec_release+0x5c/0xf8 mm/swap.c:980 pagevec_release include/linux/pagevec.h:81 [inline] shmem_undo_range+0x4b4/0x1234 mm/shmem.c:964 shmem_truncate_range mm/shmem.c:1063 [inline] shmem_evict_inode+0x1cc/0x860 mm/shmem.c:1145 evict+0x3d8/0x824 fs/inode.c:647 iput_final fs/inode.c:1769 [inline] iput+0x6b4/0x770 fs/inode.c:1795 dentry_unlink_inode+0x360/0x438 fs/dcache.c:380 __dentry_kill+0x318/0x590 fs/dcache.c:586 dentry_kill+0xcc/0x24c fs/dcache.c:-1 dput+0x22c/0x448 fs/dcache.c:893 do_renameat2+0x74c/0xc90 fs/namei.c:4995 __do_sys_renameat fs/namei.c:5033 [inline] __se_sys_renameat fs/namei.c:5030 [inline] __arm64_sys_renameat+0xcc/0xe8 fs/namei.c:5030 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x28c arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x5c/0x140 arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1d0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584