[v6.6] BUG: Bad page state in __get_metapage

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syzbot

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Jun 20, 2025, 4:02:35 PM6/20/25

to syzkaller...@googlegroups.com

Hello,

syzbot found the following issue on:

HEAD commit: 6282921b6825 Linux 6.6.94
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=168f5370580000
kernel config: https://syzkaller.appspot.com/x/.config?x=96da6b2210cda427
dashboard link: https://syzkaller.appspot.com/bug?extid=fc5f83474e77007a7759
compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/a3bf0d8e22b2/disk-6282921b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d1d442f782d0/vmlinux-6282921b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a8378f4b7e1b/bzImage-6282921b.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+fc5f83...@syzkaller.appspotmail.com

ERROR: (device loop9): duplicateIXtree:
ERROR: (device loop9): remounting filesystem as read-only
BUG: Bad page state in process syz.9.1006 pfn:1bbfe
page:ffffea00006eff80 refcount:0 mapcount:0 mapping:0000000000000000 index:0xd pfn:0x1bbfe
flags: 0xfff0800000820c(referenced|uptodate|workingset|private|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff0800000820c ffffea00014f0ac8 ffffea00007bc2c8 0000000000000000
raw: 000000000000000d ffff88805fb9ee88 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 12798, tgid 12797 (syz.9.1006), ts 478569053662, free_ts 478285508046
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:3753
do_read_cache_page+0x32/0x250 mm/filemap.c:3855
read_mapping_page include/linux/pagemap.h:892 [inline]
__get_metapage+0x31a/0xfa0 fs/jfs/jfs_metapage.c:620
diReadSpecial+0x25b/0x6f0 fs/jfs/jfs_imap.c:447
jfs_mount+0x3d1/0x860 fs/jfs/jfs_mount.c:166
jfs_fill_super+0x4e2/0xac0 fs/jfs/super.c:556
mount_bdev+0x22b/0x2d0 fs/super.c:1643
legacy_get_tree+0xea/0x180 fs/fs_context.c:662
vfs_get_tree+0x8c/0x280 fs/super.c:1764
do_new_mount+0x24b/0xa40 fs/namespace.c:3366
do_mount fs/namespace.c:3706 [inline]
__do_sys_mount fs/namespace.c:3915 [inline]
__se_sys_mount+0x2da/0x3c0 fs/namespace.c:3892
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_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]
mapping_try_invalidate+0x438/0x4f0 mm/truncate.c:535
generic_shutdown_super+0x134/0x2b0 fs/super.c:693
kill_block_super+0x44/0x90 fs/super.c:1660
xfs_kill_sb+0x15/0x50 fs/xfs/xfs_super.c:2032
deactivate_locked_super+0x97/0x100 fs/super.c:481
cleanup_mnt+0x429/0x4c0 fs/namespace.c:1250
task_work_run+0x1ce/0x250 kernel/task_work.c:239
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xb1/0x140 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
Modules linked in:

CPU: 1 PID: 12798 Comm: syz.9.1006 Tainted: G B 6.6.94-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
<TASK>
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:371
jfs_remount+0x33b/0x5b0 fs/jfs/super.c:451
reconfigure_super+0x21e/0x880 fs/super.c:1151
do_remount fs/namespace.c:2900 [inline]
path_mount+0xd19/0xfe0 fs/namespace.c:3685
do_mount fs/namespace.c:3706 [inline]
__do_sys_mount fs/namespace.c:3915 [inline]
__se_sys_mount+0x2da/0x3c0 fs/namespace.c:3892
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
RIP: 0033:0x7f38c89900ca
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f38c9891e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f38c9891ef0 RCX: 00007f38c89900ca
RDX: 0000200000000180 RSI: 00002000000006c0 RDI: 0000000000000000
RBP: 0000200000000180 R08: 00007f38c9891ef0 R09: 0000000001a4243c
R10: 0000000001a4243c R11: 0000000000000246 R12: 00002000000006c0
R13: 00007f38c9891eb0 R14: 0000000000000000 R15: 0000200000000580
</TASK>

---
This report is generated by a bot. It may contain errors.
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If the report is already addressed, let syzbot know by replying with:
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#syz undup

syzbot

unread,

Jun 23, 2025, 11:15:30 AM6/23/25

to syzkaller...@googlegroups.com

syzbot has found a reproducer for the following issue on:

HEAD commit: 6282921b6825 Linux 6.6.94
git tree: linux-6.6.y

console output: https://syzkaller.appspot.com/x/log.txt?x=15efadd4580000

kernel config: https://syzkaller.appspot.com/x/.config?x=96da6b2210cda427
dashboard link: https://syzkaller.appspot.com/bug?extid=fc5f83474e77007a7759
compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13efadd4580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=155b6b0c580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/a3bf0d8e22b2/disk-6282921b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d1d442f782d0/vmlinux-6282921b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a8378f4b7e1b/bzImage-6282921b.xz

mounted in repro: https://storage.googleapis.com/syzbot-assets/39d4282de744/mount_0.gz
fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=12756182580000)

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+fc5f83...@syzkaller.appspotmail.com

syz-executor117[5761]: memfd_create() called without MFD_EXEC or MFD_NOEXEC_SEAL set
loop0: detected capacity change from 0 to 32768
ERROR: (device loop0): duplicateIXtree:
ERROR: (device loop0): remounting filesystem as read-only
BUG: Bad page state in process syz-executor117 pfn:75699
page:ffffea0001d5a640 refcount:0 mapcount:0 mapping:0000000000000000 index:0x33 pfn:0x75699
flags: 0xfff0000000800c(referenced|uptodate|private|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff0000000800c ffffea0001d5a608 ffffc90003e97940 0000000000000000
raw: 0000000000000033 ffff88807567d4d8 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 0x40c40(GFP_NOFS|__GFP_COMP), pid 5761, tgid 5761 (syz-executor117), ts 62062629741, free_ts 50705502652

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

__filemap_get_folio+0x3ee/0xbc0 mm/filemap.c:1962
pagecache_get_page+0x2a/0x250 mm/folio-compat.c:99
find_or_create_page include/linux/pagemap.h:755 [inline]
grab_cache_page include/linux/pagemap.h:877 [inline]
__get_metapage+0x2a8/0xfa0 fs/jfs/jfs_metapage.c:613
diNewExt+0xa81/0x3120 fs/jfs/jfs_imap.c:2275
diAllocExt fs/jfs/jfs_imap.c:1952 [inline]
diAllocAG+0xe7a/0x1de0 fs/jfs/jfs_imap.c:1669
diAlloc+0x1d5/0x1660 fs/jfs/jfs_imap.c:1590
ialloc+0x8c/0x950 fs/jfs/jfs_inode.c:56
jfs_mkdir+0x191/0xa30 fs/jfs/namei.c:225
vfs_mkdir+0x296/0x440 fs/namei.c:4113
do_mkdirat+0x1d4/0x440 fs/namei.c:4136
__do_sys_mkdir fs/namei.c:4156 [inline]
__se_sys_mkdir fs/namei.c:4154 [inline]
__x64_sys_mkdir+0x6e/0x80 fs/namei.c:4154

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
pipe_buf_release include/linux/pipe_fs_i.h:219 [inline]
pipe_read+0x678/0x12a0 fs/pipe.c:324
call_read_iter include/linux/fs.h:2012 [inline]
new_sync_read fs/read_write.c:389 [inline]
vfs_read+0x431/0x920 fs/read_write.c:470
ksys_read+0x147/0x250 fs/read_write.c:613

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

Modules linked in:
CPU: 1 PID: 5761 Comm: syz-executor117 Not tainted 6.6.94-syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
<TASK>
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:371
jfs_remount+0x33b/0x5b0 fs/jfs/super.c:451
reconfigure_super+0x21e/0x880 fs/super.c:1151
do_remount fs/namespace.c:2900 [inline]
path_mount+0xd19/0xfe0 fs/namespace.c:3685
do_mount fs/namespace.c:3706 [inline]
__do_sys_mount fs/namespace.c:3915 [inline]
__se_sys_mount+0x2da/0x3c0 fs/namespace.c:3892
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

RIP: 0033:0x7f782eb7977a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff59b9fde8 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f782eb7977a

RDX: 0000200000000180 RSI: 00002000000006c0 RDI: 0000000000000000

RBP: 00002000000006c0 R08: 00007fff59b9fe80 R09: 0000000000000000
R10: 0000000001a4243c R11: 0000000000000286 R12: 0000200000000180
R13: 00007fff59b9fe80 R14: 0000000000000000 R15: 0000200000000580
</TASK>
BUG: Bad page state in process syz-executor117 pfn:75698
page:ffffea0001d5a600 refcount:0 mapcount:0 mapping:0000000000000000 index:0x32 pfn:0x75698
flags: 0xfff0000000800c(referenced|uptodate|private|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff0000000800c ffffea0001d59fc8 ffffc90003e97940 0000000000000000
raw: 0000000000000032 ffff88807567d3e0 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 0x40c40(GFP_NOFS|__GFP_COMP), pid 5761, tgid 5761 (syz-executor117), ts 62062581689, free_ts 50705489003

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

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

Modules linked in:
CPU: 0 PID: 5761 Comm: syz-executor117 Tainted: G B 6.6.94-syzkaller #0

RDX: 0000200000000180 RSI: 00002000000006c0 RDI: 0000000000000000

RBP: 00002000000006c0 R08: 00007fff59b9fe80 R09: 0000000000000000
R10: 0000000001a4243c R11: 0000000000000286 R12: 0000200000000180
R13: 00007fff59b9fe80 R14: 0000000000000000 R15: 0000200000000580
</TASK>
BUG: Bad page state in process syz-executor117 pfn:7567f
page:ffffea0001d59fc0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x31 pfn:0x7567f
flags: 0xfff0000000800c(referenced|uptodate|private|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff0000000800c ffffea0001d59f08 ffffc90003e97940 0000000000000000
raw: 0000000000000031 ffff88807567d2e8 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 0x40c40(GFP_NOFS|__GFP_COMP), pid 5761, tgid 5761 (syz-executor117), ts 62062532845, free_ts 50700877167

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

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

Modules linked in:
CPU: 0 PID: 5761 Comm: syz-executor117 Tainted: G B 6.6.94-syzkaller #0

RDX: 0000200000000180 RSI: 00002000000006c0 RDI: 0000000000000000

raw: 00fff0800000820c ffffea0000bb6c88 ffffea0000bb6d88 0000000000000000
raw: 000000000000000d ffff88802edb3e88 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 0x40c40(GFP_NOFS|__GFP_COMP), pid 5761, tgid 5761 (syz-executor117), ts 62033333637, free_ts 36192306278

free_unref_page+0x32/0x2e0 mm/page_alloc.c:2429
discard_slab mm/slub.c:2122 [inline]
__unfreeze_partials+0x1cf/0x210 mm/slub.c:2662
put_cpu_partial+0x17c/0x250 mm/slub.c:2738
__slab_free+0x31d/0x410 mm/slub.c:3686
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:3485 [inline]
slab_alloc mm/slub.c:3493 [inline]
__kmem_cache_alloc_lru mm/slub.c:3500 [inline]
kmem_cache_alloc_lru+0x115/0x2e0 mm/slub.c:3516
__d_alloc+0x31/0x730 fs/dcache.c:1773
d_alloc+0x4b/0x1b0 fs/dcache.c:1853
lookup_one_qstr_excl+0xca/0x250 fs/namei.c:1605
do_unlinkat+0x18c/0x570 fs/namei.c:4377
__do_sys_unlink fs/namei.c:4439 [inline]
__se_sys_unlink fs/namei.c:4437 [inline]
__x64_sys_unlink+0x49/0x50 fs/namei.c:4437

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: 5761 Comm: syz-executor117 Tainted: G B 6.6.94-syzkaller #0

RDX: 0000200000000180 RSI: 00002000000006c0 RDI: 0000000000000000

RBP: 00002000000006c0 R08: 00007fff59b9fe80 R09: 0000000000000000
R10: 0000000001a4243c R11: 0000000000000286 R12: 0000200000000180
R13: 00007fff59b9fe80

---
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