[moderation] [fs?] KASAN: slab-use-after-free Read in d_alloc_parallel
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syzbot
Jun 14, 2026, 9:03:34 PM (2 days ago) Jun 14
to syzkaller-upst...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: c425609d6ac4 Add linux-next specific files for 20260612
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=165dc3b6580000
kernel config: https://syzkaller.appspot.com/x/.config?x=d7a56b1e89b63439
dashboard link: https://syzkaller.appspot.com/bug?extid=85ab38f552bf45fd9aa9
compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6
CC: [da...@kernel.org drive...@lists.linux.dev gre...@linuxfoundation.org linux-...@vger.kernel.org linux-...@vger.kernel.org raf...@kernel.org]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/7fab9a8df61a/disk-c425609d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c2577196651b/vmlinux-c425609d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/053557a7471e/bzImage-c425609d.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+85ab38...@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 ffff888029db0e90 by task kworker/u8:11/2403
CPU: 1 UID: 0 PID: 2403 Comm: kworker/u8:11 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/0xa20 kernel/locking/rtmutex.c:1430
spin_unlock include/linux/spinlock_rt.h:109 [inline]
d_alloc_parallel+0x10c0/0x16c0 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+0xd2a/0x1910 fs/namei.c:2656
path_openat+0x23c/0x3850 fs/namei.c:4855
do_file_open+0x23e/0x4a0 fs/namei.c:4888
do_open_execat+0x12b/0x590 fs/exec.c:785
alloc_bprm+0x24/0x640 fs/exec.c:1431
class_bprm_constructor fs/exec.c:1497 [inline]
kernel_execve+0x85/0x9c0 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 2409:
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:4610 [inline]
slab_alloc_node mm/slub.c:4943 [inline]
kmem_cache_alloc_lru_noprof+0x347/0x6a0 mm/slub.c:4976
__d_alloc+0x37/0x6f0 fs/dcache.c:1902
d_alloc_parallel+0xde/0x16c0 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+0xd2a/0x1910 fs/namei.c:2656
path_openat+0x23c/0x3850 fs/namei.c:4855
do_file_open+0x23e/0x4a0 fs/namei.c:4888
do_open_execat+0x12b/0x590 fs/exec.c:785
alloc_bprm+0x24/0x640 fs/exec.c:1431
class_bprm_constructor fs/exec.c:1497 [inline]
kernel_execve+0x85/0x9c0 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 21:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
kasan_save_free_info+0x40/0x50 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:2703 [inline]
slab_free mm/slub.c:6402 [inline]
kmem_cache_free+0x187/0x6c0 mm/slub.c:6529
rcu_do_batch kernel/rcu/tree.c:2645 [inline]
rcu_core kernel/rcu/tree.c:2897 [inline]
rcu_cpu_kthread+0x950/0x1480 kernel/rcu/tree.c:2985
smpboot_thread_fn+0x57c/0xa80 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/0x8b0 kernel/rcu/tree.c:3279
dentry_kill+0x4d3/0x880 fs/dcache.c:845
finish_dput+0x1a/0x260 fs/dcache.c:1001
handle_mounts fs/namei.c:1753 [inline]
step_into_slowpath+0x4cc/0x820 fs/namei.c:2104
step_into fs/namei.c:2152 [inline]
walk_component fs/namei.c:2288 [inline]
link_path_walk+0xd5e/0x1910 fs/namei.c:2656
path_openat+0x23c/0x3850 fs/namei.c:4855
do_file_open+0x23e/0x4a0 fs/namei.c:4888
do_open_execat+0x12b/0x590 fs/exec.c:785
alloc_bprm+0x24/0x640 fs/exec.c:1431
class_bprm_constructor fs/exec.c:1497 [inline]
kernel_execve+0x85/0x9c0 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 ffff888029db0dc0
which belongs to the cache dentry of size 376
The buggy address is located 208 bytes inside of
freed 376-byte region [ffff888029db0dc0, ffff888029db0f38)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x29db0
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x80000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000040 ffff888140413280 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800120012 00000000f5000000 0000000000000000
head: 0080000000000040 ffff888140413280 dead000000000100 dead000000000122
head: 0000000000000000 0000000800120012 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 1, tgid 1 (swapper/0), ts 15474384442, 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+0x2639/0x26b0 mm/page_alloc.c:3946
__alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5304
alloc_slab_page mm/slub.c:3292 [inline]
allocate_slab+0x79/0x5e0 mm/slub.c:3406
new_slab mm/slub.c:3452 [inline]
refill_objects+0x2d8/0x350 mm/slub.c:7335
refill_sheaf mm/slub.c:2830 [inline]
__pcs_replace_empty_main+0x330/0x690 mm/slub.c:4701
alloc_from_pcs mm/slub.c:4799 [inline]
slab_alloc_node mm/slub.c:4931 [inline]
kmem_cache_alloc_lru_noprof+0x45e/0x6a0 mm/slub.c:4976
__d_alloc+0x37/0x6f0 fs/dcache.c:1902
d_alloc+0x4b/0x190 fs/dcache.c:1981
lookup_one_qstr_excl+0xd8/0x360 fs/namei.c:1806
__start_dirop fs/namei.c:2920 [inline]
start_dirop+0x5c/0x90 fs/namei.c:2942
simple_start_creating+0xcc/0x110 fs/libfs.c:2305
debugfs_start_creating+0xdb/0x1a0 fs/debugfs/inode.c:394
debugfs_create_dir+0x24/0x350 fs/debugfs/inode.c:572
__media_device_register+0x301/0x3c0 drivers/media/mc/mc-device.c:774
vicodec_probe+0x39a/0x500 drivers/media/test-drivers/vicodec/vicodec-core.c:2170
page_owner free stack trace missing
Memory state around the buggy address:
ffff888029db0d80: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
ffff888029db0e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888029db0e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888029db0f00: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc 00
ffff888029db0f80: 00 00 00 00 00 00 00 00 00 00 00 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.
syzbot engineers can be reached at syzk...@googlegroups.com.
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If the report is a duplicate of another one, reply with:
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If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: c425609d6ac4 Add linux-next specific files for 20260612
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=165dc3b6580000
kernel config: https://syzkaller.appspot.com/x/.config?x=d7a56b1e89b63439
dashboard link: https://syzkaller.appspot.com/bug?extid=85ab38f552bf45fd9aa9
compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6
CC: [da...@kernel.org drive...@lists.linux.dev gre...@linuxfoundation.org linux-...@vger.kernel.org linux-...@vger.kernel.org raf...@kernel.org]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/7fab9a8df61a/disk-c425609d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c2577196651b/vmlinux-c425609d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/053557a7471e/bzImage-c425609d.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+85ab38...@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 ffff888029db0e90 by task kworker/u8:11/2403
CPU: 1 UID: 0 PID: 2403 Comm: kworker/u8:11 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/0xa20 kernel/locking/rtmutex.c:1430
spin_unlock include/linux/spinlock_rt.h:109 [inline]
d_alloc_parallel+0x10c0/0x16c0 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+0xd2a/0x1910 fs/namei.c:2656
path_openat+0x23c/0x3850 fs/namei.c:4855
do_file_open+0x23e/0x4a0 fs/namei.c:4888
do_open_execat+0x12b/0x590 fs/exec.c:785
alloc_bprm+0x24/0x640 fs/exec.c:1431
class_bprm_constructor fs/exec.c:1497 [inline]
kernel_execve+0x85/0x9c0 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 2409:
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:4610 [inline]
slab_alloc_node mm/slub.c:4943 [inline]
kmem_cache_alloc_lru_noprof+0x347/0x6a0 mm/slub.c:4976
__d_alloc+0x37/0x6f0 fs/dcache.c:1902
d_alloc_parallel+0xde/0x16c0 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+0xd2a/0x1910 fs/namei.c:2656
path_openat+0x23c/0x3850 fs/namei.c:4855
do_file_open+0x23e/0x4a0 fs/namei.c:4888
do_open_execat+0x12b/0x590 fs/exec.c:785
alloc_bprm+0x24/0x640 fs/exec.c:1431
class_bprm_constructor fs/exec.c:1497 [inline]
kernel_execve+0x85/0x9c0 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 21:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
kasan_save_free_info+0x40/0x50 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:2703 [inline]
slab_free mm/slub.c:6402 [inline]
kmem_cache_free+0x187/0x6c0 mm/slub.c:6529
rcu_do_batch kernel/rcu/tree.c:2645 [inline]
rcu_core kernel/rcu/tree.c:2897 [inline]
rcu_cpu_kthread+0x950/0x1480 kernel/rcu/tree.c:2985
smpboot_thread_fn+0x57c/0xa80 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/0x8b0 kernel/rcu/tree.c:3279
dentry_kill+0x4d3/0x880 fs/dcache.c:845
finish_dput+0x1a/0x260 fs/dcache.c:1001
handle_mounts fs/namei.c:1753 [inline]
step_into_slowpath+0x4cc/0x820 fs/namei.c:2104
step_into fs/namei.c:2152 [inline]
walk_component fs/namei.c:2288 [inline]
link_path_walk+0xd5e/0x1910 fs/namei.c:2656
path_openat+0x23c/0x3850 fs/namei.c:4855
do_file_open+0x23e/0x4a0 fs/namei.c:4888
do_open_execat+0x12b/0x590 fs/exec.c:785
alloc_bprm+0x24/0x640 fs/exec.c:1431
class_bprm_constructor fs/exec.c:1497 [inline]
kernel_execve+0x85/0x9c0 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 ffff888029db0dc0
which belongs to the cache dentry of size 376
The buggy address is located 208 bytes inside of
freed 376-byte region [ffff888029db0dc0, ffff888029db0f38)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x29db0
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x80000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000040 ffff888140413280 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800120012 00000000f5000000 0000000000000000
head: 0080000000000040 ffff888140413280 dead000000000100 dead000000000122
head: 0000000000000000 0000000800120012 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 1, tgid 1 (swapper/0), ts 15474384442, 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+0x2639/0x26b0 mm/page_alloc.c:3946
__alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5304
alloc_slab_page mm/slub.c:3292 [inline]
allocate_slab+0x79/0x5e0 mm/slub.c:3406
new_slab mm/slub.c:3452 [inline]
refill_objects+0x2d8/0x350 mm/slub.c:7335
refill_sheaf mm/slub.c:2830 [inline]
__pcs_replace_empty_main+0x330/0x690 mm/slub.c:4701
alloc_from_pcs mm/slub.c:4799 [inline]
slab_alloc_node mm/slub.c:4931 [inline]
kmem_cache_alloc_lru_noprof+0x45e/0x6a0 mm/slub.c:4976
__d_alloc+0x37/0x6f0 fs/dcache.c:1902
d_alloc+0x4b/0x190 fs/dcache.c:1981
lookup_one_qstr_excl+0xd8/0x360 fs/namei.c:1806
__start_dirop fs/namei.c:2920 [inline]
start_dirop+0x5c/0x90 fs/namei.c:2942
simple_start_creating+0xcc/0x110 fs/libfs.c:2305
debugfs_start_creating+0xdb/0x1a0 fs/debugfs/inode.c:394
debugfs_create_dir+0x24/0x350 fs/debugfs/inode.c:572
__media_device_register+0x301/0x3c0 drivers/media/mc/mc-device.c:774
vicodec_probe+0x39a/0x500 drivers/media/test-drivers/vicodec/vicodec-core.c:2170
page_owner free stack trace missing
Memory state around the buggy address:
ffff888029db0d80: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
ffff888029db0e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888029db0e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888029db0f00: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc 00
ffff888029db0f80: 00 00 00 00 00 00 00 00 00 00 00 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.
syzbot engineers can be reached at syzk...@googlegroups.com.
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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
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
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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