[v5.15] KASAN: invalid-free in dev_set_name
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syzbot
Aug 6, 2026, 6:30:31 PM (11 days ago) Aug 6
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 9c7634c60784 Linux 5.15.214
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=15283e49580000
kernel config: https://syzkaller.appspot.com/x/.config?x=f161cbc9aef65db0
dashboard link: https://syzkaller.appspot.com/bug?extid=6d70675ca53c6c740269
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/a77ef10eb83f/disk-9c7634c6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9e27d6d7ff73/vmlinux-9c7634c6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/2f95795bf4ae/bzImage-9c7634c6.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6d7067...@syzkaller.appspotmail.com
configfs-gadget gadget: uvc: uvc_function_bind()
==================================================================
BUG: KASAN: double-free or invalid-free in slab_free mm/slub.c:3504 [inline]
BUG: KASAN: double-free or invalid-free in kfree+0xef/0x2a0 mm/slub.c:4564
CPU: 1 PID: 10756 Comm: syz.6.1687 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
<TASK>
dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
print_address_description+0x60/0x2d0 mm/kasan/report.c:248
kasan_report_invalid_free+0x3a/0x70 mm/kasan/report.c:373
____kasan_slab_free+0xf3/0x110 mm/kasan/common.c:-1
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1710 [inline]
slab_free_freelist_hook+0xec/0x170 mm/slub.c:1736
slab_free mm/slub.c:3504 [inline]
kfree+0xef/0x2a0 mm/slub.c:4564
kobject_set_name_vargs+0xc6/0x110 lib/kobject.c:317
dev_set_name+0xdf/0x130 drivers/base/core.c:3200
__video_register_device+0x354e/0x4450 drivers/media/v4l2-core/v4l2-dev.c:1036
video_register_device include/media/v4l2-dev.h:384 [inline]
uvc_register_video+0x22f/0x2d0 drivers/usb/gadget/function/f_uvc.c:450
uvc_function_bind+0xcde/0x12d0 drivers/usb/gadget/function/f_uvc.c:773
usb_add_function+0x2d9/0x980 drivers/usb/gadget/composite.c:324
configfs_composite_bind+0xa02/0xf60 drivers/usb/gadget/configfs.c:1417
udc_bind_to_driver+0x203/0x5f0 drivers/usb/gadget/udc/core.c:1574
usb_gadget_probe_driver+0x1fb/0x380 drivers/usb/gadget/udc/core.c:1637
gadget_dev_desc_UDC_store+0x1ba/0x2e0 drivers/usb/gadget/configfs.c:289
flush_write_buffer fs/configfs/file.c:207 [inline]
configfs_write_iter+0x30b/0x400 fs/configfs/file.c:229
call_write_iter include/linux/fs.h:2173 [inline]
new_sync_write fs/read_write.c:507 [inline]
vfs_write+0x748/0xd70 fs/read_write.c:594
ksys_write+0x153/0x260 fs/read_write.c:647
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
RIP: 0033:0x7f82b46010d9
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:00007f82b2859028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f82b4888fa0 RCX: 00007f82b46010d9
RDX: 000000000000000c RSI: 0000200000002100 RDI: 0000000000000003
RBP: 00007f82b4698024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f82b4889038 R14: 00007f82b4888fa0 R15: 00007ffd72311488
</TASK>
Allocated by task 7694:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
____kasan_kmalloc mm/kasan/common.c:513 [inline]
__kasan_kmalloc+0xaf/0xe0 mm/kasan/common.c:522
kmalloc_node include/linux/slab.h:630 [inline]
kvmalloc_node+0x84/0x130 mm/util.c:619
xt_jumpstack_alloc net/netfilter/x_tables.c:1377 [inline]
xt_replace_table+0x160/0x750 net/netfilter/x_tables.c:1416
__do_replace+0x16f/0xa00 net/ipv6/netfilter/ip6_tables.c:1081
do_replace net/ipv6/netfilter/ip6_tables.c:1158 [inline]
do_ip6t_set_ctl+0xaa4/0xd90 net/ipv6/netfilter/ip6_tables.c:1643
nf_setsockopt+0x25f/0x280 net/netfilter/nf_sockopt.c:101
ipv6_setsockopt+0x20ba/0x3cc0 net/ipv6/ipv6_sockglue.c:1014
tcp_setsockopt+0x229/0x1e60 net/ipv4/tcp.c:3722
__sys_setsockopt+0x2bf/0x3d0 net/socket.c:2213
__do_sys_setsockopt net/socket.c:2224 [inline]
__se_sys_setsockopt net/socket.c:2221 [inline]
__x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2221
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
The buggy address belongs to the object at ffff888022f6c8c0
which belongs to the cache kmalloc-16 of size 16
The buggy address is located 0 bytes inside of
16-byte region [ffff888022f6c8c0, ffff888022f6c8d0)
The buggy address belongs to the page:
page:ffffea00008bdb00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888022f6c120 pfn:0x22f6c
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffffea00007bc340 0000000400000004 ffff888016c413c0
raw: ffff888022f6c120 0000000080800017 00000001ffffffff 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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 4187, ts 60932342964, free_ts 60930973928
prep_new_page mm/page_alloc.c:2426 [inline]
get_page_from_freelist+0x24f6/0x2670 mm/page_alloc.c:4192
__alloc_pages+0x1ee/0x480 mm/page_alloc.c:5501
__alloc_pages_node include/linux/gfp.h:570 [inline]
alloc_slab_page mm/slub.c:1782 [inline]
allocate_slab mm/slub.c:1917 [inline]
new_slab+0xb6/0x4b0 mm/slub.c:1980
___slab_alloc+0x807/0xdd0 mm/slub.c:3013
__slab_alloc mm/slub.c:3100 [inline]
slab_alloc_node mm/slub.c:3191 [inline]
__kmalloc_node+0x142/0x3a0 mm/slub.c:4456
kmalloc_node include/linux/slab.h:630 [inline]
kvmalloc_node+0x84/0x130 mm/util.c:619
xt_jumpstack_alloc net/netfilter/x_tables.c:1377 [inline]
xt_replace_table+0x160/0x750 net/netfilter/x_tables.c:1416
xt_register_table+0x151/0x450 net/netfilter/x_tables.c:1502
ip6t_register_table+0x16a/0x7b0 net/ipv6/netfilter/ip6_tables.c:1756
ip6table_filter_table_init+0x71/0xb0 net/ipv6/netfilter/ip6table_filter.c:56
xt_find_table_lock+0x220/0x360 net/netfilter/x_tables.c:1282
xt_request_find_table_lock+0x22/0x100 net/netfilter/x_tables.c:1307
get_info net/ipv6/netfilter/ip6_tables.c:979 [inline]
do_ip6t_get_ctl+0x5e8/0x1130 net/ipv6/netfilter/ip6_tables.c:1667
nf_getsockopt+0x25e/0x280 net/netfilter/nf_sockopt.c:116
ipv6_getsockopt+0x43f/0x2390 net/ipv6/ipv6_sockglue.c:1492
tcp_getsockopt+0x209/0x2530 net/ipv4/tcp.c:4323
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
free_slab mm/slub.c:2020 [inline]
discard_slab mm/slub.c:2026 [inline]
__unfreeze_partials+0x188/0x1e0 mm/slub.c:2512
put_cpu_partial+0x12d/0x190 mm/slub.c:2592
qlist_free_all+0x35/0x90 mm/kasan/quarantine.c:176
kasan_quarantine_reduce+0x150/0x160 mm/kasan/quarantine.c:283
__kasan_slab_alloc+0x2f/0xc0 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]
kmem_cache_alloc_node_trace+0x194/0x2f0 mm/slub.c:3275
kmalloc_node include/linux/slab.h:625 [inline]
kzalloc_node include/linux/slab.h:749 [inline]
__get_vm_area_node+0x119/0x2d0 mm/vmalloc.c:2423
__vmalloc_node_range+0xef/0x8b0 mm/vmalloc.c:3027
__vmalloc_node mm/vmalloc.c:3087 [inline]
vzalloc+0x75/0x80 mm/vmalloc.c:3157
alloc_counters+0xcc/0x740 net/ipv4/netfilter/ip_tables.c:800
copy_entries_to_user net/ipv4/netfilter/ip_tables.c:822 [inline]
get_entries net/ipv4/netfilter/ip_tables.c:1021 [inline]
do_ipt_get_ctl+0xa37/0x1110 net/ipv4/netfilter/ip_tables.c:1666
nf_getsockopt+0x25e/0x280 net/netfilter/nf_sockopt.c:116
ip_getsockopt+0x1219/0x1660 net/ipv4/ip_sockglue.c:1797
Memory state around the buggy address:
ffff888022f6c780: fb fb fc fc fb fb fc fc fb fb fc fc 00 04 fc fc
ffff888022f6c800: fb fb fc fc fb fb fc fc fb fb fc fc 00 05 fc fc
>ffff888022f6c880: fb fb fc fc 00 00 fc fc fb fb fc fc fb fb fc fc
^
ffff888022f6c900: 00 01 fc fc fb fb fc fc fb fb fc fc fb fb fc fc
ffff888022f6c980: fb fb fc fc fb fb fc fc fb fb fc fc fb fb 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 overwrite report's subsystems, reply with:
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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: 9c7634c60784 Linux 5.15.214
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=15283e49580000
kernel config: https://syzkaller.appspot.com/x/.config?x=f161cbc9aef65db0
dashboard link: https://syzkaller.appspot.com/bug?extid=6d70675ca53c6c740269
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/a77ef10eb83f/disk-9c7634c6.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9e27d6d7ff73/vmlinux-9c7634c6.xz
kernel image: https://storage.googleapis.com/syzbot-assets/2f95795bf4ae/bzImage-9c7634c6.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6d7067...@syzkaller.appspotmail.com
configfs-gadget gadget: uvc: uvc_function_bind()
==================================================================
BUG: KASAN: double-free or invalid-free in slab_free mm/slub.c:3504 [inline]
BUG: KASAN: double-free or invalid-free in kfree+0xef/0x2a0 mm/slub.c:4564
CPU: 1 PID: 10756 Comm: syz.6.1687 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
<TASK>
dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
print_address_description+0x60/0x2d0 mm/kasan/report.c:248
kasan_report_invalid_free+0x3a/0x70 mm/kasan/report.c:373
____kasan_slab_free+0xf3/0x110 mm/kasan/common.c:-1
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1710 [inline]
slab_free_freelist_hook+0xec/0x170 mm/slub.c:1736
slab_free mm/slub.c:3504 [inline]
kfree+0xef/0x2a0 mm/slub.c:4564
kobject_set_name_vargs+0xc6/0x110 lib/kobject.c:317
dev_set_name+0xdf/0x130 drivers/base/core.c:3200
__video_register_device+0x354e/0x4450 drivers/media/v4l2-core/v4l2-dev.c:1036
video_register_device include/media/v4l2-dev.h:384 [inline]
uvc_register_video+0x22f/0x2d0 drivers/usb/gadget/function/f_uvc.c:450
uvc_function_bind+0xcde/0x12d0 drivers/usb/gadget/function/f_uvc.c:773
usb_add_function+0x2d9/0x980 drivers/usb/gadget/composite.c:324
configfs_composite_bind+0xa02/0xf60 drivers/usb/gadget/configfs.c:1417
udc_bind_to_driver+0x203/0x5f0 drivers/usb/gadget/udc/core.c:1574
usb_gadget_probe_driver+0x1fb/0x380 drivers/usb/gadget/udc/core.c:1637
gadget_dev_desc_UDC_store+0x1ba/0x2e0 drivers/usb/gadget/configfs.c:289
flush_write_buffer fs/configfs/file.c:207 [inline]
configfs_write_iter+0x30b/0x400 fs/configfs/file.c:229
call_write_iter include/linux/fs.h:2173 [inline]
new_sync_write fs/read_write.c:507 [inline]
vfs_write+0x748/0xd70 fs/read_write.c:594
ksys_write+0x153/0x260 fs/read_write.c:647
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
RIP: 0033:0x7f82b46010d9
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:00007f82b2859028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f82b4888fa0 RCX: 00007f82b46010d9
RDX: 000000000000000c RSI: 0000200000002100 RDI: 0000000000000003
RBP: 00007f82b4698024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f82b4889038 R14: 00007f82b4888fa0 R15: 00007ffd72311488
</TASK>
Allocated by task 7694:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
____kasan_kmalloc mm/kasan/common.c:513 [inline]
__kasan_kmalloc+0xaf/0xe0 mm/kasan/common.c:522
kmalloc_node include/linux/slab.h:630 [inline]
kvmalloc_node+0x84/0x130 mm/util.c:619
xt_jumpstack_alloc net/netfilter/x_tables.c:1377 [inline]
xt_replace_table+0x160/0x750 net/netfilter/x_tables.c:1416
__do_replace+0x16f/0xa00 net/ipv6/netfilter/ip6_tables.c:1081
do_replace net/ipv6/netfilter/ip6_tables.c:1158 [inline]
do_ip6t_set_ctl+0xaa4/0xd90 net/ipv6/netfilter/ip6_tables.c:1643
nf_setsockopt+0x25f/0x280 net/netfilter/nf_sockopt.c:101
ipv6_setsockopt+0x20ba/0x3cc0 net/ipv6/ipv6_sockglue.c:1014
tcp_setsockopt+0x229/0x1e60 net/ipv4/tcp.c:3722
__sys_setsockopt+0x2bf/0x3d0 net/socket.c:2213
__do_sys_setsockopt net/socket.c:2224 [inline]
__se_sys_setsockopt net/socket.c:2221 [inline]
__x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2221
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
The buggy address belongs to the object at ffff888022f6c8c0
which belongs to the cache kmalloc-16 of size 16
The buggy address is located 0 bytes inside of
16-byte region [ffff888022f6c8c0, ffff888022f6c8d0)
The buggy address belongs to the page:
page:ffffea00008bdb00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888022f6c120 pfn:0x22f6c
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffffea00007bc340 0000000400000004 ffff888016c413c0
raw: ffff888022f6c120 0000000080800017 00000001ffffffff 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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 4187, ts 60932342964, free_ts 60930973928
prep_new_page mm/page_alloc.c:2426 [inline]
get_page_from_freelist+0x24f6/0x2670 mm/page_alloc.c:4192
__alloc_pages+0x1ee/0x480 mm/page_alloc.c:5501
__alloc_pages_node include/linux/gfp.h:570 [inline]
alloc_slab_page mm/slub.c:1782 [inline]
allocate_slab mm/slub.c:1917 [inline]
new_slab+0xb6/0x4b0 mm/slub.c:1980
___slab_alloc+0x807/0xdd0 mm/slub.c:3013
__slab_alloc mm/slub.c:3100 [inline]
slab_alloc_node mm/slub.c:3191 [inline]
__kmalloc_node+0x142/0x3a0 mm/slub.c:4456
kmalloc_node include/linux/slab.h:630 [inline]
kvmalloc_node+0x84/0x130 mm/util.c:619
xt_jumpstack_alloc net/netfilter/x_tables.c:1377 [inline]
xt_replace_table+0x160/0x750 net/netfilter/x_tables.c:1416
xt_register_table+0x151/0x450 net/netfilter/x_tables.c:1502
ip6t_register_table+0x16a/0x7b0 net/ipv6/netfilter/ip6_tables.c:1756
ip6table_filter_table_init+0x71/0xb0 net/ipv6/netfilter/ip6table_filter.c:56
xt_find_table_lock+0x220/0x360 net/netfilter/x_tables.c:1282
xt_request_find_table_lock+0x22/0x100 net/netfilter/x_tables.c:1307
get_info net/ipv6/netfilter/ip6_tables.c:979 [inline]
do_ip6t_get_ctl+0x5e8/0x1130 net/ipv6/netfilter/ip6_tables.c:1667
nf_getsockopt+0x25e/0x280 net/netfilter/nf_sockopt.c:116
ipv6_getsockopt+0x43f/0x2390 net/ipv6/ipv6_sockglue.c:1492
tcp_getsockopt+0x209/0x2530 net/ipv4/tcp.c:4323
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
free_slab mm/slub.c:2020 [inline]
discard_slab mm/slub.c:2026 [inline]
__unfreeze_partials+0x188/0x1e0 mm/slub.c:2512
put_cpu_partial+0x12d/0x190 mm/slub.c:2592
qlist_free_all+0x35/0x90 mm/kasan/quarantine.c:176
kasan_quarantine_reduce+0x150/0x160 mm/kasan/quarantine.c:283
__kasan_slab_alloc+0x2f/0xc0 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]
kmem_cache_alloc_node_trace+0x194/0x2f0 mm/slub.c:3275
kmalloc_node include/linux/slab.h:625 [inline]
kzalloc_node include/linux/slab.h:749 [inline]
__get_vm_area_node+0x119/0x2d0 mm/vmalloc.c:2423
__vmalloc_node_range+0xef/0x8b0 mm/vmalloc.c:3027
__vmalloc_node mm/vmalloc.c:3087 [inline]
vzalloc+0x75/0x80 mm/vmalloc.c:3157
alloc_counters+0xcc/0x740 net/ipv4/netfilter/ip_tables.c:800
copy_entries_to_user net/ipv4/netfilter/ip_tables.c:822 [inline]
get_entries net/ipv4/netfilter/ip_tables.c:1021 [inline]
do_ipt_get_ctl+0xa37/0x1110 net/ipv4/netfilter/ip_tables.c:1666
nf_getsockopt+0x25e/0x280 net/netfilter/nf_sockopt.c:116
ip_getsockopt+0x1219/0x1660 net/ipv4/ip_sockglue.c:1797
Memory state around the buggy address:
ffff888022f6c780: fb fb fc fc fb fb fc fc fb fb fc fc 00 04 fc fc
ffff888022f6c800: fb fb fc fc fb fb fc fc fb fb fc fc 00 05 fc fc
>ffff888022f6c880: fb fb fc fc 00 00 fc fc fb fb fc fc fb fb fc fc
^
ffff888022f6c900: 00 01 fc fc fb fb fc fc fb fb fc fc fb fb fc fc
ffff888022f6c980: fb fb fc fc fb fb fc fc fb fb fc fc fb fb fc fc
==================================================================
---
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