BUG: Bad page state in process syz-executor pfn:5da84 page:ffffea000176a100 refcount:0 mapcount:0 mapping:0000000000000000 index:0x4 pfn:0x5da84 flags: 0xfff00000002006(referenced|uptodate|private|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000002006 ffffea0001e02148 ffffc90002e1fa20 0000000000000000 raw: 0000000000000004 ffff88801cce79b0 00000000ffffffff 0000000000000000 page dumped because: PAGE_FLAGS_CHECK_AT_FREE flag(s) set page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x100c40(GFP_NOFS|__GFP_HARDWALL), pid 4850, ts 93459439172, free_ts 93396692949 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x24f6/0x2670 mm/page_alloc.c:4192 __alloc_pages+0x1ee/0x480 mm/page_alloc.c:5501 __page_cache_alloc+0xce/0x440 mm/filemap.c:1022 do_read_cache_page+0x1d4/0x1010 mm/filemap.c:3457 read_mapping_page include/linux/pagemap.h:515 [inline] __get_metapage+0x35d/0x1060 fs/jfs/jfs_metapage.c:621 dbFree+0x2a6/0x640 fs/jfs/jfs_dmap.c:385 txFreeMap+0x9e2/0xde0 fs/jfs/jfs_txnmgr.c:2550 xtTruncate+0xccf/0x2d10 fs/jfs/jfs_xtree.c:3428 jfs_truncate_nolock+0x2a8/0x340 fs/jfs/inode.c:390 jfs_truncate+0xca/0x140 fs/jfs/inode.c:429 jfs_setattr+0x3c6/0x5e0 fs/jfs/file.c:122 notify_change+0xbc6/0xee0 fs/attr.c:505 do_truncate+0x1ac/0x240 fs/open.c:65 handle_truncate fs/namei.c:3316 [inline] do_open fs/namei.c:3663 [inline] path_openat+0x293b/0x2fb0 fs/namei.c:3793 do_filp_open+0x1df/0x400 fs/namei.c:3820 do_sys_openat2+0x14b/0x500 fs/open.c:1255 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317 free_unref_page_list+0x119/0x830 mm/page_alloc.c:3433 release_pages+0x185f/0x1bd0 mm/swap.c:963 tlb_batch_pages_flush mm/mmu_gather.c:50 [inline] tlb_flush_mmu_free mm/mmu_gather.c:241 [inline] tlb_flush_mmu mm/mmu_gather.c:248 [inline] tlb_finish_mmu+0x1b4/0x370 mm/mmu_gather.c:371 exit_mmap+0x3d0/0x640 mm/mmap.c:3218 __mmput+0x115/0x390 kernel/fork.c:1133 exit_mm+0x632/0x7b0 kernel/exit.c:557 do_exit+0x5b8/0x2110 kernel/exit.c:877 do_group_exit+0x12c/0x2f0 kernel/exit.c:1004 get_signal+0x7eb/0x12e0 kernel/signal.c:2913 arch_do_signal_or_restart+0xe6/0x12a0 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:157 [inline] exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:181 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:217 __syscall_exit_to_user_mode_work kernel/entry/common.c:299 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:310 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Modules linked in: CPU: 0 PID: 4185 Comm: syz-executor Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 bad_page+0x14b/0x170 mm/page_alloc.c:652 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+0x383/0x6c0 mm/page_alloc.c:3317 free_unref_page_list+0x119/0x830 mm/page_alloc.c:3433 release_pages+0x185f/0x1bd0 mm/swap.c:963 __pagevec_release+0x6d/0xe0 mm/swap.c:983 pagevec_release include/linux/pagevec.h:81 [inline] truncate_inode_pages_range+0x335/0xf90 mm/truncate.c:329 dbUnmount+0x105/0x170 fs/jfs/jfs_dmap.c:264 jfs_umount+0x1f3/0x360 fs/jfs/jfs_umount.c:89 jfs_put_super+0x88/0x190 fs/jfs/super.c:194 generic_shutdown_super+0x130/0x300 fs/super.c:475 kill_block_super+0x7c/0xe0 fs/super.c:1438 deactivate_locked_super+0x93/0xf0 fs/super.c:335 cleanup_mnt+0x426/0x4d0 fs/namespace.c:1148 task_work_run+0x125/0x1a0 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:184 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:217 __syscall_exit_to_user_mode_work kernel/entry/common.c:299 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:310 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f4542be6397 Code: a2 c7 05 5c 43 25 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffc93adc398 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007f4542c7b48b RCX: 00007f4542be6397 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc93adc450 RBP: 00007ffc93adc450 R08: 00007ffc93add450 R09: 00000000ffffffff R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc93add4e0 R13: 00007f4542c7b48b R14: 0000000000016d98 R15: 00007ffc93add520