BUG: Bad page state in process syz.2.312 pfn:77ee2 page:ffffea0001dfb880 refcount:0 mapcount:0 mapping:0000000000000000 index:0x4 pfn:0x77ee2 flags: 0xfff1800000820c(referenced|uptodate|workingset|private|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff1800000820c ffffea0001ff7888 ffffc9000c447520 0000000000000000 raw: 0000000000000004 ffff88807f4c92e8 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 0x140c40(GFP_NOFS|__GFP_COMP|__GFP_HARDWALL), pid 8245, tgid 8244 (syz.2.312), ts 241445807998, free_ts 241438795550 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1cd/0x210 mm/page_alloc.c:1554 prep_new_page mm/page_alloc.c:1561 [inline] get_page_from_freelist+0x195c/0x19f0 mm/page_alloc.c:3191 __alloc_pages+0x1e3/0x460 mm/page_alloc.c:4457 folio_alloc+0x1e/0x30 mm/mempolicy.c:2291 filemap_alloc_folio+0xdf/0x470 mm/filemap.c:1004 do_read_cache_folio+0x36c/0x7e0 mm/filemap.c:3768 do_read_cache_page+0x32/0x250 mm/filemap.c:3870 read_mapping_page include/linux/pagemap.h:892 [inline] __get_metapage+0x31a/0xfa0 fs/jfs/jfs_metapage.c:620 dbAllocCtl+0xd4/0x9b0 fs/jfs/jfs_dmap.c:1813 dbAllocAG+0x1e7/0xfe0 fs/jfs/jfs_dmap.c:1353 dbDiscardAG+0x2ce/0x8f0 fs/jfs/jfs_dmap.c:1608 jfs_ioc_trim+0x42f/0x660 fs/jfs/jfs_discard.c:105 jfs_ioctl+0x2b9/0x3d0 fs/jfs/ioctl.c:131 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1154 [inline] free_unref_page_prepare+0x7ce/0x8e0 mm/page_alloc.c:2336 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2429 discard_slab mm/slub.c:2127 [inline] __unfreeze_partials+0x1cf/0x210 mm/slub.c:2667 put_cpu_partial+0x17c/0x250 mm/slub.c:2743 __slab_free+0x31d/0x410 mm/slub.c:3700 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x75/0xe0 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6e/0x4d0 mm/slab.h:767 slab_alloc_node mm/slub.c:3495 [inline] slab_alloc mm/slub.c:3503 [inline] __kmem_cache_alloc_lru mm/slub.c:3510 [inline] kmem_cache_alloc+0x11e/0x2e0 mm/slub.c:3519 vm_area_alloc+0x24/0x1d0 kernel/fork.c:486 __mmap_region mm/mmap.c:2770 [inline] mmap_region+0xc8a/0x2020 mm/mmap.c:2941 do_mmap+0x92f/0x10a0 mm/mmap.c:1385 vm_mmap_pgoff+0x1c0/0x400 mm/util.c:556 ksys_mmap_pgoff+0x520/0x700 mm/mmap.c:1431 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 Modules linked in: CPU: 1 PID: 8245 Comm: syz.2.312 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106 bad_page+0x14b/0x170 mm/page_alloc.c:512 free_page_is_bad mm/page_alloc.c:961 [inline] free_pages_prepare mm/page_alloc.c:1146 [inline] free_unref_page_prepare+0x887/0x8e0 mm/page_alloc.c:2336 free_unref_page_list+0xbe/0x860 mm/page_alloc.c:2475 release_pages+0x1fa0/0x2220 mm/swap.c:1022 __folio_batch_release+0x71/0xe0 mm/swap.c:1042 folio_batch_release include/linux/pagevec.h:83 [inline] truncate_inode_pages_range+0x358/0xf00 mm/truncate.c:396 dbUnmount+0x109/0x180 fs/jfs/jfs_dmap.c:264 jfs_umount+0x258/0x3c0 fs/jfs/jfs_umount.c:87 jfs_put_super+0x8c/0x190 fs/jfs/super.c:194 generic_shutdown_super+0x134/0x2b0 fs/super.c:693 kill_block_super+0x44/0x90 fs/super.c:1660 deactivate_locked_super+0x97/0x100 fs/super.c:481 cleanup_mnt+0x429/0x4c0 fs/namespace.c:1259 task_work_run+0x1ce/0x250 kernel/task_work.c:239 exit_task_work include/linux/task_work.h:43 [inline] do_exit+0x90b/0x23c0 kernel/exit.c:883 do_group_exit+0x21b/0x2d0 kernel/exit.c:1024 get_signal+0x12fc/0x1400 kernel/signal.c:2902 arch_do_signal_or_restart+0x9c/0x7b0 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174 exit_to_user_mode_prepare+0xf6/0x180 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fad2b98f749 Code: Unable to access opcode bytes at 0x7fad2b98f71f. RSP: 002b:00007fad2c8be0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007fad2bbe5fa8 RCX: 00007fad2b98f749 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fad2bbe5fa8 RBP: 00007fad2bbe5fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fad2bbe6038 R14: 00007ffdea01e2f0 R15: 00007ffdea01e3d8