syzbot

ERROR: (device loop0): dbUpdatePMap: blocks are outside the map
ERROR: (device loop0): dbAllocNext: Corrupt dmap page
ialloc: diAlloc returned -5!
BUG: Bad page state in process syz-executor419  pfn:109a0f
page:0000000021a870bc refcount:0 mapcount:0 mapping:0000000000000000 index:0xd pfn:0x109a0f
flags: 0x5ffc00000002046(referenced|uptodate|workingset|private|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000002046 fffffc0003750948 fffffc000368d188 0000000000000000
raw: 000000000000000d ffff0000ce1fee88 00000000ffffffff 0000000000000000
page dumped because: PAGE_FLAGS_CHECK_AT_FREE flag(s) set
Modules linked in:
CPU: 1 PID: 4296 Comm: syz-executor419 Not tainted 6.1.141-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
 dump_stack+0x1c/0x5c lib/dump_stack.c:113
 bad_page+0x188/0x1a8 mm/page_alloc.c:699
 free_page_is_bad_report+0xf8/0x170 mm/page_alloc.c:1281
 free_page_is_bad mm/page_alloc.c:1291 [inline]
 free_pages_prepare mm/page_alloc.c:1452 [inline]
 free_pcp_prepare mm/page_alloc.c:1509 [inline]
 free_unref_page_prepare+0x62c/0xb18 mm/page_alloc.c:3384
 free_unref_page_list+0xd8/0x8ec mm/page_alloc.c:3525
 release_pages+0xd84/0xfac mm/swap.c:1035
 __pagevec_release+0x84/0xf8 mm/swap.c:1055
 pagevec_release include/linux/pagevec.h:71 [inline]
 folio_batch_release include/linux/pagevec.h:135 [inline]
 truncate_inode_pages_range+0x2a8/0xd20 mm/truncate.c:372
 truncate_inode_pages+0x2c/0x3c mm/truncate.c:451
 jfs_remount+0x280/0x484 fs/jfs/super.c:451
 legacy_reconfigure+0xf8/0x110 fs/fs_context.c:655
 reconfigure_super+0x1d4/0x79c fs/super.c:977
 do_remount fs/namespace.c:2710 [inline]
 path_mount+0xbd4/0xe78 fs/namespace.c:3376
 do_mount fs/namespace.c:3397 [inline]
 __do_sys_mount fs/namespace.c:3605 [inline]
 __se_sys_mount fs/namespace.c:3582 [inline]
 __arm64_sys_mount+0x49c/0x584 fs/namespace.c:3582
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585