[syzbot] [fs?] KASAN: slab-use-after-free Read in d_alloc_parallel
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syzbot
Jun 19, 2026, 7:56:22 PM (15 hours ago) Jun 19
to bra...@kernel.org, ja...@suse.cz, linux-...@vger.kernel.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com, vi...@zeniv.linux.org.uk
Hello,
syzbot found the following issue on:
HEAD commit: ec039126b7fa Add linux-next specific files for 20260611
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=11f307f2580000
kernel config: https://syzkaller.appspot.com/x/.config?x=d0d1fa2afcbce17c
dashboard link: https://syzkaller.appspot.com/bug?extid=bcc49cd0a89969bb101a
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/be809c32a471/disk-ec039126.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/13ea1053e3b5/vmlinux-ec039126.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1bcdab47ddc8/bzImage-ec039126.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+bcc49c...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-use-after-free in __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
BUG: KASAN: slab-use-after-free in _raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:166
Read of size 1 at addr ffff8880273bb728 by task kworker/u8:2/1377
CPU: 1 UID: 0 PID: 1377 Comm: kworker/u8:2 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
<TASK>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_address_description+0x55/0x1e0 mm/kasan/report.c:378
print_report+0x58/0x70 mm/kasan/report.c:482
kasan_report+0x117/0x150 mm/kasan/report.c:595
__kasan_check_byte+0x2a/0x40 mm/kasan/common.c:574
kasan_check_byte include/linux/kasan.h:402 [inline]
lock_acquire+0x84/0x350 kernel/locking/lockdep.c:5844
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:166
rt_mutex_slowunlock+0xbf/0x8b0 kernel/locking/rtmutex.c:1430
spin_unlock include/linux/spinlock_rt.h:109 [inline]
d_alloc_parallel+0x103d/0x1630 fs/dcache.c:2826
__lookup_slow+0x82/0x2f0 fs/namei.c:1904
lookup_slow+0x53/0x70 fs/namei.c:1936
walk_component fs/namei.c:2282 [inline]
link_path_walk+0xd1e/0x18d0 fs/namei.c:2656
path_openat+0x22c/0x37e0 fs/namei.c:4855
do_file_open+0x23e/0x4a0 fs/namei.c:4888
do_open_execat+0x12b/0x590 fs/exec.c:785
alloc_bprm+0x28/0x660 fs/exec.c:1431
class_bprm_constructor fs/exec.c:1496 [inline]
kernel_execve+0x87/0x930 fs/exec.c:1889
call_usermodehelper_exec_async+0x212/0x360 kernel/umh.c:109
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Allocated by task 1378:
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:4614 [inline]
slab_alloc_node mm/slub.c:4941 [inline]
kmem_cache_alloc_lru_noprof+0x354/0x6b0 mm/slub.c:4974
__d_alloc+0x37/0x6f0 fs/dcache.c:1902
d_alloc_parallel+0xe3/0x1630 fs/dcache.c:2761
__lookup_slow+0x82/0x2f0 fs/namei.c:1904
lookup_slow+0x53/0x70 fs/namei.c:1936
walk_component fs/namei.c:2282 [inline]
link_path_walk+0xd1e/0x18d0 fs/namei.c:2656
path_openat+0x22c/0x37e0 fs/namei.c:4855
do_file_open+0x23e/0x4a0 fs/namei.c:4888
do_open_execat+0x12b/0x590 fs/exec.c:785
alloc_bprm+0x28/0x660 fs/exec.c:1431
class_bprm_constructor fs/exec.c:1496 [inline]
kernel_execve+0x87/0x930 fs/exec.c:1889
call_usermodehelper_exec_async+0x212/0x360 kernel/umh.c:109
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Freed by task 29:
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:2699 [inline]
slab_free mm/slub.c:6400 [inline]
kmem_cache_free+0x187/0x6c0 mm/slub.c:6527
rcu_do_batch kernel/rcu/tree.c:2645 [inline]
rcu_core kernel/rcu/tree.c:2897 [inline]
rcu_cpu_kthread+0x99e/0x1470 kernel/rcu/tree.c:2985
smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
__call_rcu_common kernel/rcu/tree.c:3159 [inline]
call_rcu+0xee/0x890 kernel/rcu/tree.c:3279
dentry_kill+0x4ed/0x890 fs/dcache.c:845
finish_dput+0x1a/0x260 fs/dcache.c:1001
handle_mounts fs/namei.c:1753 [inline]
step_into_slowpath+0x487/0x7e0 fs/namei.c:2104
step_into fs/namei.c:2152 [inline]
walk_component fs/namei.c:2288 [inline]
link_path_walk+0xd50/0x18d0 fs/namei.c:2656
path_openat+0x22c/0x37e0 fs/namei.c:4855
do_file_open+0x23e/0x4a0 fs/namei.c:4888
do_open_execat+0x12b/0x590 fs/exec.c:785
alloc_bprm+0x28/0x660 fs/exec.c:1431
class_bprm_constructor fs/exec.c:1496 [inline]
kernel_execve+0x87/0x930 fs/exec.c:1889
call_usermodehelper_exec_async+0x212/0x360 kernel/umh.c:109
ret_from_fork+0x514/0xb70 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 ffff8880273bb658
which belongs to the cache dentry of size 376
The buggy address is located 208 bytes inside of
freed 376-byte region [ffff8880273bb658, ffff8880273bb7d0)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880273bb810 pfn:0x273ba
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x80000000000240(workingset|head|node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000240 ffff88801c68c500 ffff88801c68bb88 ffff88801c68bb88
raw: ffff8880273bb810 000000080012000e 00000000f5000000 0000000000000000
head: 0080000000000240 ffff88801c68c500 ffff88801c68bb88 ffff88801c68bb88
head: ffff8880273bb810 000000080012000e 00000000f5000000 0000000000000000
head: 0080000000000001 ffffffffffffff81 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000002
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Reclaimable, gfp_mask 0xd20d0(__GFP_RECLAIMABLE|__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1378, tgid 1378 (kworker/u8:6), ts 9289059430, free_ts 0
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1859
prep_new_page mm/page_alloc.c:1867 [inline]
get_page_from_freelist+0x265c/0x26e0 mm/page_alloc.c:3946
__alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5304
alloc_slab_page mm/slub.c:3288 [inline]
allocate_slab+0x76/0x5d0 mm/slub.c:3406
new_slab mm/slub.c:3452 [inline]
refill_objects+0x2d9/0x350 mm/slub.c:7333
refill_sheaf mm/slub.c:2826 [inline]
__pcs_replace_empty_main+0x331/0x690 mm/slub.c:4698
alloc_from_pcs mm/slub.c:4796 [inline]
slab_alloc_node mm/slub.c:4929 [inline]
kmem_cache_alloc_lru_noprof+0x46b/0x6b0 mm/slub.c:4974
__d_alloc+0x37/0x6f0 fs/dcache.c:1902
d_alloc_parallel+0xe3/0x1630 fs/dcache.c:2761
__lookup_slow+0x82/0x2f0 fs/namei.c:1904
lookup_slow+0x53/0x70 fs/namei.c:1936
walk_component fs/namei.c:2282 [inline]
link_path_walk+0xd1e/0x18d0 fs/namei.c:2656
path_openat+0x22c/0x37e0 fs/namei.c:4855
do_file_open+0x23e/0x4a0 fs/namei.c:4888
do_open_execat+0x12b/0x590 fs/exec.c:785
alloc_bprm+0x28/0x660 fs/exec.c:1431
page_owner free stack trace missing
Memory state around the buggy address:
ffff8880273bb600: fb fb fb fc fc fc fc fc fc fc fc fa fb fb fb fb
ffff8880273bb680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880273bb700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880273bb780: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc
ffff8880273bb800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
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If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: ec039126b7fa Add linux-next specific files for 20260611
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=11f307f2580000
kernel config: https://syzkaller.appspot.com/x/.config?x=d0d1fa2afcbce17c
dashboard link: https://syzkaller.appspot.com/bug?extid=bcc49cd0a89969bb101a
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/be809c32a471/disk-ec039126.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/13ea1053e3b5/vmlinux-ec039126.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1bcdab47ddc8/bzImage-ec039126.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+bcc49c...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-use-after-free in __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
BUG: KASAN: slab-use-after-free in _raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:166
Read of size 1 at addr ffff8880273bb728 by task kworker/u8:2/1377
CPU: 1 UID: 0 PID: 1377 Comm: kworker/u8:2 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
<TASK>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_address_description+0x55/0x1e0 mm/kasan/report.c:378
print_report+0x58/0x70 mm/kasan/report.c:482
kasan_report+0x117/0x150 mm/kasan/report.c:595
__kasan_check_byte+0x2a/0x40 mm/kasan/common.c:574
kasan_check_byte include/linux/kasan.h:402 [inline]
lock_acquire+0x84/0x350 kernel/locking/lockdep.c:5844
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:166
rt_mutex_slowunlock+0xbf/0x8b0 kernel/locking/rtmutex.c:1430
spin_unlock include/linux/spinlock_rt.h:109 [inline]
d_alloc_parallel+0x103d/0x1630 fs/dcache.c:2826
__lookup_slow+0x82/0x2f0 fs/namei.c:1904
lookup_slow+0x53/0x70 fs/namei.c:1936
walk_component fs/namei.c:2282 [inline]
link_path_walk+0xd1e/0x18d0 fs/namei.c:2656
path_openat+0x22c/0x37e0 fs/namei.c:4855
do_file_open+0x23e/0x4a0 fs/namei.c:4888
do_open_execat+0x12b/0x590 fs/exec.c:785
alloc_bprm+0x28/0x660 fs/exec.c:1431
class_bprm_constructor fs/exec.c:1496 [inline]
kernel_execve+0x87/0x930 fs/exec.c:1889
call_usermodehelper_exec_async+0x212/0x360 kernel/umh.c:109
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Allocated by task 1378:
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:4614 [inline]
slab_alloc_node mm/slub.c:4941 [inline]
kmem_cache_alloc_lru_noprof+0x354/0x6b0 mm/slub.c:4974
__d_alloc+0x37/0x6f0 fs/dcache.c:1902
d_alloc_parallel+0xe3/0x1630 fs/dcache.c:2761
__lookup_slow+0x82/0x2f0 fs/namei.c:1904
lookup_slow+0x53/0x70 fs/namei.c:1936
walk_component fs/namei.c:2282 [inline]
link_path_walk+0xd1e/0x18d0 fs/namei.c:2656
path_openat+0x22c/0x37e0 fs/namei.c:4855
do_file_open+0x23e/0x4a0 fs/namei.c:4888
do_open_execat+0x12b/0x590 fs/exec.c:785
alloc_bprm+0x28/0x660 fs/exec.c:1431
class_bprm_constructor fs/exec.c:1496 [inline]
kernel_execve+0x87/0x930 fs/exec.c:1889
call_usermodehelper_exec_async+0x212/0x360 kernel/umh.c:109
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Freed by task 29:
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:2699 [inline]
slab_free mm/slub.c:6400 [inline]
kmem_cache_free+0x187/0x6c0 mm/slub.c:6527
rcu_do_batch kernel/rcu/tree.c:2645 [inline]
rcu_core kernel/rcu/tree.c:2897 [inline]
rcu_cpu_kthread+0x99e/0x1470 kernel/rcu/tree.c:2985
smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
__call_rcu_common kernel/rcu/tree.c:3159 [inline]
call_rcu+0xee/0x890 kernel/rcu/tree.c:3279
dentry_kill+0x4ed/0x890 fs/dcache.c:845
finish_dput+0x1a/0x260 fs/dcache.c:1001
handle_mounts fs/namei.c:1753 [inline]
step_into_slowpath+0x487/0x7e0 fs/namei.c:2104
step_into fs/namei.c:2152 [inline]
walk_component fs/namei.c:2288 [inline]
link_path_walk+0xd50/0x18d0 fs/namei.c:2656
path_openat+0x22c/0x37e0 fs/namei.c:4855
do_file_open+0x23e/0x4a0 fs/namei.c:4888
do_open_execat+0x12b/0x590 fs/exec.c:785
alloc_bprm+0x28/0x660 fs/exec.c:1431
class_bprm_constructor fs/exec.c:1496 [inline]
kernel_execve+0x87/0x930 fs/exec.c:1889
call_usermodehelper_exec_async+0x212/0x360 kernel/umh.c:109
ret_from_fork+0x514/0xb70 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 ffff8880273bb658
which belongs to the cache dentry of size 376
The buggy address is located 208 bytes inside of
freed 376-byte region [ffff8880273bb658, ffff8880273bb7d0)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880273bb810 pfn:0x273ba
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x80000000000240(workingset|head|node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000240 ffff88801c68c500 ffff88801c68bb88 ffff88801c68bb88
raw: ffff8880273bb810 000000080012000e 00000000f5000000 0000000000000000
head: 0080000000000240 ffff88801c68c500 ffff88801c68bb88 ffff88801c68bb88
head: ffff8880273bb810 000000080012000e 00000000f5000000 0000000000000000
head: 0080000000000001 ffffffffffffff81 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000002
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Reclaimable, gfp_mask 0xd20d0(__GFP_RECLAIMABLE|__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1378, tgid 1378 (kworker/u8:6), ts 9289059430, free_ts 0
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1859
prep_new_page mm/page_alloc.c:1867 [inline]
get_page_from_freelist+0x265c/0x26e0 mm/page_alloc.c:3946
__alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5304
alloc_slab_page mm/slub.c:3288 [inline]
allocate_slab+0x76/0x5d0 mm/slub.c:3406
new_slab mm/slub.c:3452 [inline]
refill_objects+0x2d9/0x350 mm/slub.c:7333
refill_sheaf mm/slub.c:2826 [inline]
__pcs_replace_empty_main+0x331/0x690 mm/slub.c:4698
alloc_from_pcs mm/slub.c:4796 [inline]
slab_alloc_node mm/slub.c:4929 [inline]
kmem_cache_alloc_lru_noprof+0x46b/0x6b0 mm/slub.c:4974
__d_alloc+0x37/0x6f0 fs/dcache.c:1902
d_alloc_parallel+0xe3/0x1630 fs/dcache.c:2761
__lookup_slow+0x82/0x2f0 fs/namei.c:1904
lookup_slow+0x53/0x70 fs/namei.c:1936
walk_component fs/namei.c:2282 [inline]
link_path_walk+0xd1e/0x18d0 fs/namei.c:2656
path_openat+0x22c/0x37e0 fs/namei.c:4855
do_file_open+0x23e/0x4a0 fs/namei.c:4888
do_open_execat+0x12b/0x590 fs/exec.c:785
alloc_bprm+0x28/0x660 fs/exec.c:1431
page_owner free stack trace missing
Memory state around the buggy address:
ffff8880273bb600: fb fb fb fc fc fc fc fc fc fc fc fa fb fb fb fb
ffff8880273bb680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880273bb700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880273bb780: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc
ffff8880273bb800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
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If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
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