[moderation] [jfs?] KASAN: slab-use-after-free Read in txUnlock (2)
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syzbot
Feb 24, 2026, 9:48:40 PM (7 hours ago) Feb 24
to syzkaller-upst...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: a95f71ad3e2e Merge tag 'for-linus' of git://git.kernel.org..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1313fffa580000
kernel config: https://syzkaller.appspot.com/x/.config?x=65722f41f7edc17e
dashboard link: https://syzkaller.appspot.com/bug?extid=7545f40aef8c14109406
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
CC: [jfs-dis...@lists.sourceforge.net linux-...@vger.kernel.org sha...@kernel.org]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-a95f71ad.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/cef9447ff4b5/vmlinux-a95f71ad.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a1176fe9ea48/bzImage-a95f71ad.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7545f4...@syzkaller.appspotmail.com
loop0: detected capacity change from 0 to 32768
... Log Wrap ... Log Wrap ... Log Wrap ...
JFS: metapage_get_blocks failed
... Log Wrap ... Log Wrap ... Log Wrap ...
... Log Wrap ... Log Wrap ... Log Wrap ...
... Log Wrap ... Log Wrap ... Log Wrap ...
... Log Wrap ... Log Wrap ... Log Wrap ...
... Log Wrap ... Log Wrap ... Log Wrap ...
==================================================================
BUG: KASAN: slab-use-after-free in txUnlock+0x95d/0xdf0 fs/jfs/jfs_txnmgr.c:926
Read of size 2 at addr ffff88800020c3e0 by task syz.0.0/5316
CPU: 0 UID: 0 PID: 5316 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
<TASK>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xba/0x230 mm/kasan/report.c:482
kasan_report+0x117/0x150 mm/kasan/report.c:595
txUnlock+0x95d/0xdf0 fs/jfs/jfs_txnmgr.c:926
txCommit+0x4f20/0x5410 fs/jfs/jfs_txnmgr.c:1336
jfs_truncate_nolock+0x22f/0x340 fs/jfs/inode.c:407
jfs_truncate+0xce/0x140 fs/jfs/inode.c:420
jfs_direct_IO+0x1f4/0x220 fs/jfs/inode.c:350
generic_file_direct_write+0x1db/0x3e0 mm/filemap.c:4248
__generic_file_write_iter+0x11d/0x230 mm/filemap.c:4417
generic_file_write_iter+0x14a/0x680 mm/filemap.c:4457
do_iter_readv_writev+0x619/0x8c0 fs/read_write.c:-1
vfs_writev+0x33c/0x990 fs/read_write.c:1059
do_pwritev fs/read_write.c:1155 [inline]
__do_sys_pwritev2 fs/read_write.c:1213 [inline]
__se_sys_pwritev2+0x184/0x2a0 fs/read_write.c:1204
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa889f9c629
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa88ad74028 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffda RBX: 00007fa88a215fa0 RCX: 00007fa889f9c629
RDX: 0000000000000001 RSI: 0000200000000240 RDI: 0000000000000004
RBP: 00007fa88a032b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000007800 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa88a216038 R14: 00007fa88a215fa0 R15: 00007fffc0e085a8
</TASK>
Allocated by task 5316:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
unpoison_slab_object mm/kasan/common.c:340 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4501 [inline]
slab_alloc_node mm/slub.c:4830 [inline]
kmem_cache_alloc_noprof+0x2bc/0x650 mm/slub.c:4837
mempool_alloc_noprof+0x1ce/0x300 mm/mempool.c:567
alloc_metapage fs/jfs/jfs_metapage.c:264 [inline]
__get_metapage+0x50c/0xde0 fs/jfs/jfs_metapage.c:760
diWrite+0x401/0x1f40 fs/jfs/jfs_imap.c:639
txCommit+0x869/0x5410 fs/jfs/jfs_txnmgr.c:1256
jfs_truncate_nolock+0x22f/0x340 fs/jfs/inode.c:407
jfs_truncate+0xce/0x140 fs/jfs/inode.c:420
jfs_direct_IO+0x1f4/0x220 fs/jfs/inode.c:350
generic_file_direct_write+0x1db/0x3e0 mm/filemap.c:4248
__generic_file_write_iter+0x11d/0x230 mm/filemap.c:4417
generic_file_write_iter+0x14a/0x680 mm/filemap.c:4457
do_iter_readv_writev+0x619/0x8c0 fs/read_write.c:-1
vfs_writev+0x33c/0x990 fs/read_write.c:1059
do_pwritev fs/read_write.c:1155 [inline]
__do_sys_pwritev2 fs/read_write.c:1213 [inline]
__se_sys_pwritev2+0x184/0x2a0 fs/read_write.c:1204
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 79:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2687 [inline]
slab_free mm/slub.c:6124 [inline]
kmem_cache_free+0x187/0x630 mm/slub.c:6254
mempool_free+0xec/0x130 mm/mempool.c:712
free_metapage fs/jfs/jfs_metapage.c:279 [inline]
metapage_release_folio+0x40e/0x540 fs/jfs/jfs_metapage.c:636
shrink_folio_list+0x2226/0x5290 mm/vmscan.c:1491
evict_folios+0x4795/0x5880 mm/vmscan.c:4717
try_to_shrink_lruvec+0xb62/0xfa0 mm/vmscan.c:4880
shrink_one+0x25c/0x710 mm/vmscan.c:4925
shrink_many mm/vmscan.c:4988 [inline]
lru_gen_shrink_node mm/vmscan.c:5066 [inline]
shrink_node+0x3197/0x3a90 mm/vmscan.c:6046
kswapd_shrink_node mm/vmscan.c:6893 [inline]
balance_pgdat mm/vmscan.c:7069 [inline]
kswapd+0x1742/0x2e10 mm/vmscan.c:7342
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
The buggy address belongs to the object at ffff88800020c3e0
which belongs to the cache jfs_mp of size 184
The buggy address is located 0 bytes inside of
freed 184-byte region [ffff88800020c3e0, ffff88800020c498)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x20c
flags: 0x7ff00000000000(node=0|zone=0|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 007ff00000000000 ffff8880304a2c80 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 8797240623, free_ts 0
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x231/0x280 mm/page_alloc.c:1889
prep_new_page mm/page_alloc.c:1897 [inline]
get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3962
__alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250
alloc_slab_page mm/slub.c:3255 [inline]
allocate_slab+0x77/0x660 mm/slub.c:3444
new_slab mm/slub.c:3502 [inline]
refill_objects+0x331/0x3c0 mm/slub.c:7134
refill_sheaf+0x29/0x50 mm/slub.c:2804
alloc_full_sheaf mm/slub.c:2825 [inline]
__pcs_replace_empty_main+0x3ef/0x620 mm/slub.c:4588
alloc_from_pcs mm/slub.c:4681 [inline]
slab_alloc_node mm/slub.c:4815 [inline]
kmem_cache_alloc_noprof+0x37d/0x650 mm/slub.c:4837
mempool_init_node+0x1ea/0x4d0 mm/mempool.c:259
mempool_create_node_noprof+0xb8/0x150 mm/mempool.c:323
metapage_init+0xed/0x150 fs/jfs/jfs_metapage.c:292
init_jfs_fs+0xfd/0x4e0 fs/jfs/super.c:968
do_one_initcall+0x250/0x8d0 init/main.c:1382
do_initcall_level+0x104/0x190 init/main.c:1444
do_initcalls+0x59/0xa0 init/main.c:1460
kernel_init_freeable+0x2a6/0x3e0 init/main.c:1692
page_owner free stack trace missing
Memory state around the buggy address:
ffff88800020c280: fc fc fc fc fc fc fc fc fc fc fc fc fc 00 00 00
ffff88800020c300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88800020c380: 00 00 00 00 fc fc fc fc fc fc fc fc fa fb fb fb
^
ffff88800020c400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88800020c480: fb fb fb fc fc fc fc fc fc fc fc 00 00 00 00 00
==================================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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syzbot found the following issue on:
HEAD commit: a95f71ad3e2e Merge tag 'for-linus' of git://git.kernel.org..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1313fffa580000
kernel config: https://syzkaller.appspot.com/x/.config?x=65722f41f7edc17e
dashboard link: https://syzkaller.appspot.com/bug?extid=7545f40aef8c14109406
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
CC: [jfs-dis...@lists.sourceforge.net linux-...@vger.kernel.org sha...@kernel.org]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-a95f71ad.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/cef9447ff4b5/vmlinux-a95f71ad.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a1176fe9ea48/bzImage-a95f71ad.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7545f4...@syzkaller.appspotmail.com
loop0: detected capacity change from 0 to 32768
... Log Wrap ... Log Wrap ... Log Wrap ...
JFS: metapage_get_blocks failed
... Log Wrap ... Log Wrap ... Log Wrap ...
... Log Wrap ... Log Wrap ... Log Wrap ...
... Log Wrap ... Log Wrap ... Log Wrap ...
... Log Wrap ... Log Wrap ... Log Wrap ...
... Log Wrap ... Log Wrap ... Log Wrap ...
==================================================================
BUG: KASAN: slab-use-after-free in txUnlock+0x95d/0xdf0 fs/jfs/jfs_txnmgr.c:926
Read of size 2 at addr ffff88800020c3e0 by task syz.0.0/5316
CPU: 0 UID: 0 PID: 5316 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
<TASK>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xba/0x230 mm/kasan/report.c:482
kasan_report+0x117/0x150 mm/kasan/report.c:595
txUnlock+0x95d/0xdf0 fs/jfs/jfs_txnmgr.c:926
txCommit+0x4f20/0x5410 fs/jfs/jfs_txnmgr.c:1336
jfs_truncate_nolock+0x22f/0x340 fs/jfs/inode.c:407
jfs_truncate+0xce/0x140 fs/jfs/inode.c:420
jfs_direct_IO+0x1f4/0x220 fs/jfs/inode.c:350
generic_file_direct_write+0x1db/0x3e0 mm/filemap.c:4248
__generic_file_write_iter+0x11d/0x230 mm/filemap.c:4417
generic_file_write_iter+0x14a/0x680 mm/filemap.c:4457
do_iter_readv_writev+0x619/0x8c0 fs/read_write.c:-1
vfs_writev+0x33c/0x990 fs/read_write.c:1059
do_pwritev fs/read_write.c:1155 [inline]
__do_sys_pwritev2 fs/read_write.c:1213 [inline]
__se_sys_pwritev2+0x184/0x2a0 fs/read_write.c:1204
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa889f9c629
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa88ad74028 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffda RBX: 00007fa88a215fa0 RCX: 00007fa889f9c629
RDX: 0000000000000001 RSI: 0000200000000240 RDI: 0000000000000004
RBP: 00007fa88a032b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000007800 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa88a216038 R14: 00007fa88a215fa0 R15: 00007fffc0e085a8
</TASK>
Allocated by task 5316:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
unpoison_slab_object mm/kasan/common.c:340 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4501 [inline]
slab_alloc_node mm/slub.c:4830 [inline]
kmem_cache_alloc_noprof+0x2bc/0x650 mm/slub.c:4837
mempool_alloc_noprof+0x1ce/0x300 mm/mempool.c:567
alloc_metapage fs/jfs/jfs_metapage.c:264 [inline]
__get_metapage+0x50c/0xde0 fs/jfs/jfs_metapage.c:760
diWrite+0x401/0x1f40 fs/jfs/jfs_imap.c:639
txCommit+0x869/0x5410 fs/jfs/jfs_txnmgr.c:1256
jfs_truncate_nolock+0x22f/0x340 fs/jfs/inode.c:407
jfs_truncate+0xce/0x140 fs/jfs/inode.c:420
jfs_direct_IO+0x1f4/0x220 fs/jfs/inode.c:350
generic_file_direct_write+0x1db/0x3e0 mm/filemap.c:4248
__generic_file_write_iter+0x11d/0x230 mm/filemap.c:4417
generic_file_write_iter+0x14a/0x680 mm/filemap.c:4457
do_iter_readv_writev+0x619/0x8c0 fs/read_write.c:-1
vfs_writev+0x33c/0x990 fs/read_write.c:1059
do_pwritev fs/read_write.c:1155 [inline]
__do_sys_pwritev2 fs/read_write.c:1213 [inline]
__se_sys_pwritev2+0x184/0x2a0 fs/read_write.c:1204
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 79:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2687 [inline]
slab_free mm/slub.c:6124 [inline]
kmem_cache_free+0x187/0x630 mm/slub.c:6254
mempool_free+0xec/0x130 mm/mempool.c:712
free_metapage fs/jfs/jfs_metapage.c:279 [inline]
metapage_release_folio+0x40e/0x540 fs/jfs/jfs_metapage.c:636
shrink_folio_list+0x2226/0x5290 mm/vmscan.c:1491
evict_folios+0x4795/0x5880 mm/vmscan.c:4717
try_to_shrink_lruvec+0xb62/0xfa0 mm/vmscan.c:4880
shrink_one+0x25c/0x710 mm/vmscan.c:4925
shrink_many mm/vmscan.c:4988 [inline]
lru_gen_shrink_node mm/vmscan.c:5066 [inline]
shrink_node+0x3197/0x3a90 mm/vmscan.c:6046
kswapd_shrink_node mm/vmscan.c:6893 [inline]
balance_pgdat mm/vmscan.c:7069 [inline]
kswapd+0x1742/0x2e10 mm/vmscan.c:7342
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
The buggy address belongs to the object at ffff88800020c3e0
which belongs to the cache jfs_mp of size 184
The buggy address is located 0 bytes inside of
freed 184-byte region [ffff88800020c3e0, ffff88800020c498)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x20c
flags: 0x7ff00000000000(node=0|zone=0|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 007ff00000000000 ffff8880304a2c80 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 8797240623, free_ts 0
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x231/0x280 mm/page_alloc.c:1889
prep_new_page mm/page_alloc.c:1897 [inline]
get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3962
__alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5250
alloc_slab_page mm/slub.c:3255 [inline]
allocate_slab+0x77/0x660 mm/slub.c:3444
new_slab mm/slub.c:3502 [inline]
refill_objects+0x331/0x3c0 mm/slub.c:7134
refill_sheaf+0x29/0x50 mm/slub.c:2804
alloc_full_sheaf mm/slub.c:2825 [inline]
__pcs_replace_empty_main+0x3ef/0x620 mm/slub.c:4588
alloc_from_pcs mm/slub.c:4681 [inline]
slab_alloc_node mm/slub.c:4815 [inline]
kmem_cache_alloc_noprof+0x37d/0x650 mm/slub.c:4837
mempool_init_node+0x1ea/0x4d0 mm/mempool.c:259
mempool_create_node_noprof+0xb8/0x150 mm/mempool.c:323
metapage_init+0xed/0x150 fs/jfs/jfs_metapage.c:292
init_jfs_fs+0xfd/0x4e0 fs/jfs/super.c:968
do_one_initcall+0x250/0x8d0 init/main.c:1382
do_initcall_level+0x104/0x190 init/main.c:1444
do_initcalls+0x59/0xa0 init/main.c:1460
kernel_init_freeable+0x2a6/0x3e0 init/main.c:1692
page_owner free stack trace missing
Memory state around the buggy address:
ffff88800020c280: fc fc fc fc fc fc fc fc fc fc fc fc fc 00 00 00
ffff88800020c300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88800020c380: 00 00 00 00 fc fc fc fc fc fc fc fc fa fb fb fb
^
ffff88800020c400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88800020c480: fb fb fb fc fc fc fc fc fc fc fc 00 00 00 00 00
==================================================================
---
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