BUG: Bad page state in process syz-executor  pfn:7c7ef
page:ffffea0001f1fbc0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x4 pfn:0x7c7ef
flags: 0xfff00000002006(referenced|uptodate|private|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000002006 ffffea0001549c08 ffffc90002ebfa00 0000000000000000
raw: 0000000000000004 ffff8880524a2ba0 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 5567, ts 188931738640, free_ts 188740196904
 prep_new_page mm/page_alloc.c:2426 [inline]
 get_page_from_freelist+0x1bbd/0x1ca0 mm/page_alloc.c:4192
 __alloc_pages+0x1ee/0x480 mm/page_alloc.c:5487
 __page_cache_alloc+0xce/0x440 mm/filemap.c:1022
 do_read_cache_page+0x1da/0x1030 mm/filemap.c:3457
 read_mapping_page include/linux/pagemap.h:515 [inline]
 __get_metapage+0x35d/0x1060 fs/jfs/jfs_metapage.c:621
 dbAllocCtl+0xd4/0x9b0 fs/jfs/jfs_dmap.c:1881
 dbAllocAG+0x1e7/0xfe0 fs/jfs/jfs_dmap.c:1421
 dbDiscardAG+0x2c5/0x8e0 fs/jfs/jfs_dmap.c:1676
 jfs_ioc_trim+0x41e/0x680 fs/jfs/jfs_discard.c:106
 jfs_ioctl+0x2b6/0x3c0 fs/jfs/ioctl.c:132
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
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+0x8f/0x2a0 mm/page_alloc.c:3396
 qlist_free_all+0x35/0x90 mm/kasan/quarantine.c:176
 kasan_quarantine_reduce+0x150/0x160 mm/kasan/quarantine.c:283
 __kasan_slab_alloc+0x2f/0xd0 mm/kasan/common.c:444
 kasan_slab_alloc include/linux/kasan.h:254 [inline]
 slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519
 slab_alloc_node mm/slub.c:3225 [inline]
 slab_alloc mm/slub.c:3233 [inline]
 kmem_cache_alloc+0x100/0x290 mm/slub.c:3238
 getname_flags+0xb5/0x500 fs/namei.c:138
 do_sys_openat2+0xdd/0x4b0 fs/open.c:1249
 do_sys_open fs/open.c:1271 [inline]
 __do_sys_openat fs/open.c:1287 [inline]
 __se_sys_openat fs/open.c:1282 [inline]
 __x64_sys_openat+0x135/0x160 fs/open.c:1282
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
Modules linked in:
CPU: 1 PID: 4192 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 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+0x119/0x820 mm/page_alloc.c:3433
 release_pages+0x186c/0x1be0 mm/swap.c:963
 __pagevec_release+0x6d/0xe0 mm/swap.c:983
 pagevec_release include/linux/pagevec.h:81 [inline]
 truncate_inode_pages_range+0x362/0xfe0 mm/truncate.c:329
 dbUnmount+0x105/0x170 fs/jfs/jfs_dmap.c:264
 jfs_umount+0x1fa/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:1427
 deactivate_locked_super+0x93/0xf0 fs/super.c:335
 cleanup_mnt+0x42d/0x4e0 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:181
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f7039d98117
Code: a2 c7 05 7c 94 24 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:00007ffe646e48d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f7039e0071f RCX: 00007f7039d98117
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffe646e4990
RBP: 00007ffe646e4990 R08: 00007ffe646e5990 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe646e5a20
R13: 00007f7039e0071f R14: 000000000002d1c8 R15: 00007ffe646e5a60
 </TASK>
BUG: Bad page state in process syz-executor  pfn:55270
page:ffffea0001549c00 refcount:0 mapcount:0 mapping:0000000000000000 index:0x3 pfn:0x55270
flags: 0xfff00000002006(referenced|uptodate|private|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000002006 ffffea00013add08 ffffc90002ebfa00 0000000000000000
raw: 0000000000000003 ffff8880524a2c98 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 5567, ts 188937705190, free_ts 187948812069
 prep_new_page mm/page_alloc.c:2426 [inline]
 get_page_from_freelist+0x1bbd/0x1ca0 mm/page_alloc.c:4192
 __alloc_pages+0x1ee/0x480 mm/page_alloc.c:5487
 __page_cache_alloc+0xce/0x440 mm/filemap.c:1022
 do_read_cache_page+0x1da/0x1030 mm/filemap.c:3457
 read_mapping_page include/linux/pagemap.h:515 [inline]
 __get_metapage+0x35d/0x1060 fs/jfs/jfs_metapage.c:621
 dbAdjCtl+0x144/0xa20 fs/jfs/jfs_dmap.c:2551
 dbAllocDmap fs/jfs/jfs_dmap.c:2112 [inline]
 dbAllocDmapLev+0x209/0x3c0 fs/jfs/jfs_dmap.c:2056
 dbAllocCtl+0x148/0x9b0 fs/jfs/jfs_dmap.c:1893
 dbAllocAG+0x1e7/0xfe0 fs/jfs/jfs_dmap.c:1421
 dbDiscardAG+0x2c5/0x8e0 fs/jfs/jfs_dmap.c:1676
 jfs_ioc_trim+0x41e/0x680 fs/jfs/jfs_discard.c:106
 jfs_ioctl+0x2b6/0x3c0 fs/jfs/ioctl.c:132
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
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+0x119/0x820 mm/page_alloc.c:3433
 release_pages+0x186c/0x1be0 mm/swap.c:963
 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:240 [inline]
 tlb_flush_mmu mm/mmu_gather.c:247 [inline]
 tlb_finish_mmu+0x176/0x300 mm/mmu_gather.c:338
 exit_mmap+0x3d0/0x640 mm/mmap.c:3218
 __mmput+0x115/0x3b0 kernel/fork.c:1127
 exit_mm+0x588/0x6e0 kernel/exit.c:550
 do_exit+0x5a9/0x20c0 kernel/exit.c:870
 do_group_exit+0x12e/0x300 kernel/exit.c:997
 __do_sys_exit_group kernel/exit.c:1008 [inline]
 __se_sys_exit_group kernel/exit.c:1006 [inline]
 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1006
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
Modules linked in:
CPU: 0 PID: 4192 Comm: syz-executor Tainted: G    B             syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 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+0x119/0x820 mm/page_alloc.c:3433
 release_pages+0x186c/0x1be0 mm/swap.c:963
 __pagevec_release+0x6d/0xe0 mm/swap.c:983
 pagevec_release include/linux/pagevec.h:81 [inline]
 truncate_inode_pages_range+0x362/0xfe0 mm/truncate.c:329
 dbUnmount+0x105/0x170 fs/jfs/jfs_dmap.c:264
 jfs_umount+0x1fa/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:1427
 deactivate_locked_super+0x93/0xf0 fs/super.c:335
 cleanup_mnt+0x42d/0x4e0 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:181
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f7039d98117
Code: a2 c7 05 7c 94 24 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:00007ffe646e48d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f7039e0071f RCX: 00007f7039d98117
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffe646e4990
RBP: 00007ffe646e4990 R08: 00007ffe646e5990 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe646e5a20
R13: 00007f7039e0071f R14: 000000000002d1c8 R15: 00007ffe646e5a60
 </TASK>