[v5.15] KASAN: use-after-free Read in flush_space
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syzbot
Oct 21, 2025, 3:43:29 AM (3 days ago) Oct 21
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: ac56c046adf4 Linux 5.15.195
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=14978e7c580000
kernel config: https://syzkaller.appspot.com/x/.config?x=e1bb6d24ef2164eb
dashboard link: https://syzkaller.appspot.com/bug?extid=62ea0b38466b32838d94
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/c11ec9487150/disk-ac56c046.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f1130a72d3a0/vmlinux-ac56c046.xz
kernel image: https://storage.googleapis.com/syzbot-assets/7608cb6a3be5/bzImage-ac56c046.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+62ea0b...@syzkaller.appspotmail.com
BTRFS info (device loop5): chunk_block_rsv: size 0 reserved 0
BTRFS info (device loop5): delayed_block_rsv: size 0 reserved 0
BTRFS info (device loop5): delayed_refs_rsv: size 0 reserved 0
==================================================================
BUG: KASAN: use-after-free in flush_space+0x951/0xc50 fs/btrfs/space-info.c:701
Read of size 8 at addr ffff888078d198a0 by task kworker/u4:9/4589
CPU: 1 PID: 4589 Comm: kworker/u4:9 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Workqueue: events_unbound btrfs_async_reclaim_metadata_space
Call Trace:
<TASK>
dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
print_address_description+0x60/0x2d0 mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:434 [inline]
kasan_report+0xdf/0x130 mm/kasan/report.c:451
flush_space+0x951/0xc50 fs/btrfs/space-info.c:701
btrfs_async_reclaim_metadata_space+0x26f/0x330 fs/btrfs/space-info.c:953
process_one_work+0x863/0x1000 kernel/workqueue.c:2310
worker_thread+0xaa8/0x12a0 kernel/workqueue.c:2457
kthread+0x436/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
</TASK>
Allocated by task 4816:
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+0xb5/0xf0 mm/kasan/common.c:522
kmalloc include/linux/slab.h:607 [inline]
kzalloc include/linux/slab.h:738 [inline]
create_space_info+0x57/0x610 fs/btrfs/space-info.c:191
open_ctree+0x2183/0x3250 fs/btrfs/disk-io.c:3550
btrfs_fill_super+0x1c2/0x2e0 fs/btrfs/super.c:1387
btrfs_mount_root+0x857/0x8c0 fs/btrfs/super.c:1751
legacy_get_tree+0xe6/0x180 fs/fs_context.c:611
vfs_get_tree+0x88/0x270 fs/super.c:1530
fc_mount fs/namespace.c:1005 [inline]
vfs_kern_mount+0xba/0x150 fs/namespace.c:1035
btrfs_mount+0x2d7/0xa50 fs/btrfs/super.c:1811
legacy_get_tree+0xe6/0x180 fs/fs_context.c:611
vfs_get_tree+0x88/0x270 fs/super.c:1530
do_new_mount+0x24a/0xa40 fs/namespace.c:3034
do_mount fs/namespace.c:3377 [inline]
__do_sys_mount fs/namespace.c:3585 [inline]
__se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3562
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
Freed by task 4411:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:46
kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
____kasan_slab_free+0xd5/0x110 mm/kasan/common.c:366
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1710 [inline]
slab_free_freelist_hook+0xea/0x170 mm/slub.c:1736
slab_free mm/slub.c:3504 [inline]
kfree+0xef/0x2a0 mm/slub.c:4564
kobject_cleanup lib/kobject.c:713 [inline]
kobject_release lib/kobject.c:744 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x21d/0x460 lib/kobject.c:761
btrfs_free_block_groups+0xb98/0xcc0 fs/btrfs/block-group.c:4018
close_ctree+0x706/0x8c0 fs/btrfs/disk-io.c:4528
generic_shutdown_super+0x130/0x300 fs/super.c:475
kill_anon_super+0x36/0x70 fs/super.c:1089
btrfs_kill_super+0x3d/0x50 fs/btrfs/super.c:2390
deactivate_locked_super+0x93/0xf0 fs/super.c:335
cleanup_mnt+0x418/0x4d0 fs/namespace.c:1148
task_work_run+0x125/0x1a0 kernel/task_work.c:188
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:181
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
__syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x66/0xd0
The buggy address belongs to the object at ffff888078d19800
which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 160 bytes inside of
1024-byte region [ffff888078d19800, ffff888078d19c00)
The buggy address belongs to the page:
page:ffffea0001e34600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x78d18
head:ffffea0001e34600 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0000697a00 0000000500000005 ffff888016841dc0
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4185, ts 71351480326, free_ts 70775664870
prep_new_page mm/page_alloc.c:2426 [inline]
get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192
__alloc_pages+0x1e1/0x470 mm/page_alloc.c:5487
alloc_slab_page mm/slub.c:1780 [inline]
allocate_slab mm/slub.c:1917 [inline]
new_slab+0xc0/0x4b0 mm/slub.c:1980
___slab_alloc+0x81e/0xdf0 mm/slub.c:3013
__slab_alloc mm/slub.c:3100 [inline]
slab_alloc_node mm/slub.c:3191 [inline]
__kmalloc_node+0x200/0x3b0 mm/slub.c:4456
kmalloc_node include/linux/slab.h:630 [inline]
kzalloc_node include/linux/slab.h:749 [inline]
qdisc_alloc+0x8d/0xb10 net/sched/sch_generic.c:888
qdisc_create_dflt+0x5f/0x430 net/sched/sch_generic.c:950
attach_one_default_qdisc net/sched/sch_generic.c:1113 [inline]
netdev_for_each_tx_queue include/linux/netdevice.h:2379 [inline]
attach_default_qdiscs net/sched/sch_generic.c:1131 [inline]
dev_activate+0x331/0x12b0 net/sched/sch_generic.c:1190
__dev_open+0x32c/0x420 net/core/dev.c:1546
__dev_change_flags+0x20a/0x6a0 net/core/dev.c:8853
dev_change_flags+0x82/0x1a0 net/core/dev.c:8924
do_setlink+0xc01/0x3980 net/core/rtnetlink.c:2779
__rtnl_newlink net/core/rtnetlink.c:3450 [inline]
rtnl_newlink+0x1419/0x17d0 net/core/rtnetlink.c:3572
rtnetlink_rcv_msg+0x9b9/0xe60 net/core/rtnetlink.c:5650
netlink_rcv_skb+0x1e0/0x430 net/netlink/af_netlink.c:2507
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x774/0x920 net/netlink/af_netlink.c:1344
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+0x94/0x280 mm/page_alloc.c:3396
free_slab mm/slub.c:2020 [inline]
discard_slab mm/slub.c:2026 [inline]
__unfreeze_partials+0x1a5/0x200 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/0xd0 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]
slab_alloc mm/slub.c:3233 [inline]
kmem_cache_alloc_trace+0x103/0x2a0 mm/slub.c:3250
kmalloc include/linux/slab.h:607 [inline]
kzalloc include/linux/slab.h:738 [inline]
____ip_mc_inc_group+0x2ad/0xac0 net/ipv4/igmp.c:1452
__ip_mc_inc_group net/ipv4/igmp.c:1487 [inline]
ip_mc_inc_group net/ipv4/igmp.c:1493 [inline]
ip_mc_up+0x121/0x2f0 net/ipv4/igmp.c:1792
inetdev_event+0xe02/0x1360 net/ipv4/devinet.c:1586
notifier_call_chain kernel/notifier.c:83 [inline]
raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:391
call_netdevice_notifiers_extack net/core/dev.c:2061 [inline]
call_netdevice_notifiers net/core/dev.c:2075 [inline]
__dev_notify_flags+0x178/0x2d0 net/core/dev.c:-1
dev_change_flags+0xe3/0x1a0 net/core/dev.c:8929
do_setlink+0xc01/0x3980 net/core/rtnetlink.c:2779
Memory state around the buggy address:
ffff888078d19780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888078d19800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888078d19880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888078d19900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888078d19980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
This report is generated by a bot. It may contain errors.
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syzbot found the following issue on:
HEAD commit: ac56c046adf4 Linux 5.15.195
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=14978e7c580000
kernel config: https://syzkaller.appspot.com/x/.config?x=e1bb6d24ef2164eb
dashboard link: https://syzkaller.appspot.com/bug?extid=62ea0b38466b32838d94
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/c11ec9487150/disk-ac56c046.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f1130a72d3a0/vmlinux-ac56c046.xz
kernel image: https://storage.googleapis.com/syzbot-assets/7608cb6a3be5/bzImage-ac56c046.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+62ea0b...@syzkaller.appspotmail.com
BTRFS info (device loop5): chunk_block_rsv: size 0 reserved 0
BTRFS info (device loop5): delayed_block_rsv: size 0 reserved 0
BTRFS info (device loop5): delayed_refs_rsv: size 0 reserved 0
==================================================================
BUG: KASAN: use-after-free in flush_space+0x951/0xc50 fs/btrfs/space-info.c:701
Read of size 8 at addr ffff888078d198a0 by task kworker/u4:9/4589
CPU: 1 PID: 4589 Comm: kworker/u4:9 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Workqueue: events_unbound btrfs_async_reclaim_metadata_space
Call Trace:
<TASK>
dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
print_address_description+0x60/0x2d0 mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:434 [inline]
kasan_report+0xdf/0x130 mm/kasan/report.c:451
flush_space+0x951/0xc50 fs/btrfs/space-info.c:701
btrfs_async_reclaim_metadata_space+0x26f/0x330 fs/btrfs/space-info.c:953
process_one_work+0x863/0x1000 kernel/workqueue.c:2310
worker_thread+0xaa8/0x12a0 kernel/workqueue.c:2457
kthread+0x436/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
</TASK>
Allocated by task 4816:
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+0xb5/0xf0 mm/kasan/common.c:522
kmalloc include/linux/slab.h:607 [inline]
kzalloc include/linux/slab.h:738 [inline]
create_space_info+0x57/0x610 fs/btrfs/space-info.c:191
open_ctree+0x2183/0x3250 fs/btrfs/disk-io.c:3550
btrfs_fill_super+0x1c2/0x2e0 fs/btrfs/super.c:1387
btrfs_mount_root+0x857/0x8c0 fs/btrfs/super.c:1751
legacy_get_tree+0xe6/0x180 fs/fs_context.c:611
vfs_get_tree+0x88/0x270 fs/super.c:1530
fc_mount fs/namespace.c:1005 [inline]
vfs_kern_mount+0xba/0x150 fs/namespace.c:1035
btrfs_mount+0x2d7/0xa50 fs/btrfs/super.c:1811
legacy_get_tree+0xe6/0x180 fs/fs_context.c:611
vfs_get_tree+0x88/0x270 fs/super.c:1530
do_new_mount+0x24a/0xa40 fs/namespace.c:3034
do_mount fs/namespace.c:3377 [inline]
__do_sys_mount fs/namespace.c:3585 [inline]
__se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3562
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
Freed by task 4411:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:46
kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
____kasan_slab_free+0xd5/0x110 mm/kasan/common.c:366
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1710 [inline]
slab_free_freelist_hook+0xea/0x170 mm/slub.c:1736
slab_free mm/slub.c:3504 [inline]
kfree+0xef/0x2a0 mm/slub.c:4564
kobject_cleanup lib/kobject.c:713 [inline]
kobject_release lib/kobject.c:744 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x21d/0x460 lib/kobject.c:761
btrfs_free_block_groups+0xb98/0xcc0 fs/btrfs/block-group.c:4018
close_ctree+0x706/0x8c0 fs/btrfs/disk-io.c:4528
generic_shutdown_super+0x130/0x300 fs/super.c:475
kill_anon_super+0x36/0x70 fs/super.c:1089
btrfs_kill_super+0x3d/0x50 fs/btrfs/super.c:2390
deactivate_locked_super+0x93/0xf0 fs/super.c:335
cleanup_mnt+0x418/0x4d0 fs/namespace.c:1148
task_work_run+0x125/0x1a0 kernel/task_work.c:188
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:181
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
__syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x66/0xd0
The buggy address belongs to the object at ffff888078d19800
which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 160 bytes inside of
1024-byte region [ffff888078d19800, ffff888078d19c00)
The buggy address belongs to the page:
page:ffffea0001e34600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x78d18
head:ffffea0001e34600 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0000697a00 0000000500000005 ffff888016841dc0
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4185, ts 71351480326, free_ts 70775664870
prep_new_page mm/page_alloc.c:2426 [inline]
get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192
__alloc_pages+0x1e1/0x470 mm/page_alloc.c:5487
alloc_slab_page mm/slub.c:1780 [inline]
allocate_slab mm/slub.c:1917 [inline]
new_slab+0xc0/0x4b0 mm/slub.c:1980
___slab_alloc+0x81e/0xdf0 mm/slub.c:3013
__slab_alloc mm/slub.c:3100 [inline]
slab_alloc_node mm/slub.c:3191 [inline]
__kmalloc_node+0x200/0x3b0 mm/slub.c:4456
kmalloc_node include/linux/slab.h:630 [inline]
kzalloc_node include/linux/slab.h:749 [inline]
qdisc_alloc+0x8d/0xb10 net/sched/sch_generic.c:888
qdisc_create_dflt+0x5f/0x430 net/sched/sch_generic.c:950
attach_one_default_qdisc net/sched/sch_generic.c:1113 [inline]
netdev_for_each_tx_queue include/linux/netdevice.h:2379 [inline]
attach_default_qdiscs net/sched/sch_generic.c:1131 [inline]
dev_activate+0x331/0x12b0 net/sched/sch_generic.c:1190
__dev_open+0x32c/0x420 net/core/dev.c:1546
__dev_change_flags+0x20a/0x6a0 net/core/dev.c:8853
dev_change_flags+0x82/0x1a0 net/core/dev.c:8924
do_setlink+0xc01/0x3980 net/core/rtnetlink.c:2779
__rtnl_newlink net/core/rtnetlink.c:3450 [inline]
rtnl_newlink+0x1419/0x17d0 net/core/rtnetlink.c:3572
rtnetlink_rcv_msg+0x9b9/0xe60 net/core/rtnetlink.c:5650
netlink_rcv_skb+0x1e0/0x430 net/netlink/af_netlink.c:2507
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x774/0x920 net/netlink/af_netlink.c:1344
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+0x94/0x280 mm/page_alloc.c:3396
free_slab mm/slub.c:2020 [inline]
discard_slab mm/slub.c:2026 [inline]
__unfreeze_partials+0x1a5/0x200 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/0xd0 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]
slab_alloc mm/slub.c:3233 [inline]
kmem_cache_alloc_trace+0x103/0x2a0 mm/slub.c:3250
kmalloc include/linux/slab.h:607 [inline]
kzalloc include/linux/slab.h:738 [inline]
____ip_mc_inc_group+0x2ad/0xac0 net/ipv4/igmp.c:1452
__ip_mc_inc_group net/ipv4/igmp.c:1487 [inline]
ip_mc_inc_group net/ipv4/igmp.c:1493 [inline]
ip_mc_up+0x121/0x2f0 net/ipv4/igmp.c:1792
inetdev_event+0xe02/0x1360 net/ipv4/devinet.c:1586
notifier_call_chain kernel/notifier.c:83 [inline]
raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:391
call_netdevice_notifiers_extack net/core/dev.c:2061 [inline]
call_netdevice_notifiers net/core/dev.c:2075 [inline]
__dev_notify_flags+0x178/0x2d0 net/core/dev.c:-1
dev_change_flags+0xe3/0x1a0 net/core/dev.c:8929
do_setlink+0xc01/0x3980 net/core/rtnetlink.c:2779
Memory state around the buggy address:
ffff888078d19780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888078d19800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888078d19880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888078d19900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888078d19980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
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