* [syzbot] [v9fs?] KASAN: slab-use-after-free Read in p9_fid_destroy
@ 2024-03-07 8:14 syzbot
2024-05-17 11:31 ` syzbot
0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2024-03-07 8:14 UTC (permalink / raw
To: asmadeus, ericvh, linux-fsdevel, linux-kernel, linux_oss, lucho,
syzkaller-bugs, v9fs
Hello,
syzbot found the following issue on:
HEAD commit: 04b8076df253 Merge tag 'firewire-fixes-6.8-rc7' of git://g..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=150add9a180000
kernel config: https://syzkaller.appspot.com/x/.config?x=be0288b26c967205
dashboard link: https://syzkaller.appspot.com/bug?extid=d7c7a495a5e466c031b6
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-04b8076d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/926d19cdf690/vmlinux-04b8076d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/c0754e78c2bc/bzImage-04b8076d.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d7c7a495a5e466c031b6@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-use-after-free in p9_fid_destroy+0xb5/0xd0 net/9p/client.c:884
Read of size 8 at addr ffff888064295880 by task kworker/u16:0/11
CPU: 0 PID: 11 Comm: kworker/u16:0 Not tainted 6.8.0-rc6-syzkaller-00250-g04b8076df253 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: events_unbound v9fs_upload_to_server_worker
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:377 [inline]
print_report+0xc4/0x620 mm/kasan/report.c:488
kasan_report+0xda/0x110 mm/kasan/report.c:601
p9_fid_destroy+0xb5/0xd0 net/9p/client.c:884
p9_client_clunk+0x12a/0x170 net/9p/client.c:1456
p9_fid_put include/net/9p/client.h:278 [inline]
v9fs_free_request+0xdc/0x110 fs/9p/vfs_addr.c:128
netfs_free_request+0x225/0x670 fs/netfs/objects.c:97
netfs_put_request+0x19b/0x1f0 fs/netfs/objects.c:130
netfs_free_subrequest fs/netfs/objects.c:178 [inline]
netfs_put_subrequest+0x3be/0x600 fs/netfs/objects.c:192
v9fs_upload_to_server fs/9p/vfs_addr.c:36 [inline]
v9fs_upload_to_server_worker+0x182/0x360 fs/9p/vfs_addr.c:44
process_one_work+0x889/0x15e0 kernel/workqueue.c:2633
process_scheduled_works kernel/workqueue.c:2706 [inline]
worker_thread+0x8b9/0x12a0 kernel/workqueue.c:2787
kthread+0x2c6/0x3b0 kernel/kthread.c:388
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
</TASK>
Allocated by task 14429:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387
kmalloc include/linux/slab.h:590 [inline]
kzalloc include/linux/slab.h:711 [inline]
p9_fid_create+0x45/0x470 net/9p/client.c:853
p9_client_walk+0xc7/0x550 net/9p/client.c:1154
clone_fid fs/9p/fid.h:23 [inline]
v9fs_fid_clone fs/9p/fid.h:33 [inline]
v9fs_file_open+0x623/0xc30 fs/9p/vfs_file.c:56
do_dentry_open+0x8da/0x18c0 fs/open.c:953
do_open fs/namei.c:3645 [inline]
path_openat+0x1e00/0x29a0 fs/namei.c:3802
do_filp_open+0x1de/0x440 fs/namei.c:3829
do_sys_openat2+0x17a/0x1e0 fs/open.c:1404
do_sys_open fs/open.c:1419 [inline]
__do_sys_openat fs/open.c:1435 [inline]
__se_sys_openat fs/open.c:1430 [inline]
__x64_sys_openat+0x175/0x210 fs/open.c:1430
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x6f/0x77
Freed by task 18115:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:589
poison_slab_object mm/kasan/common.c:240 [inline]
__kasan_slab_free+0x11d/0x1a0 mm/kasan/common.c:256
kasan_slab_free include/linux/kasan.h:184 [inline]
slab_free_hook mm/slub.c:2121 [inline]
slab_free mm/slub.c:4299 [inline]
kfree+0x124/0x370 mm/slub.c:4409
p9_client_destroy+0x14c/0x480 net/9p/client.c:1070
v9fs_session_close+0x49/0x2d0 fs/9p/v9fs.c:506
v9fs_kill_super+0x4d/0xa0 fs/9p/vfs_super.c:223
deactivate_locked_super+0xbe/0x1a0 fs/super.c:472
deactivate_super+0xde/0x100 fs/super.c:505
cleanup_mnt+0x222/0x450 fs/namespace.c:1267
task_work_run+0x14f/0x250 kernel/task_work.c:180
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop kernel/entry/common.c:108 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline]
syscall_exit_to_user_mode+0x278/0x2a0 kernel/entry/common.c:212
do_syscall_64+0xe5/0x270 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x6f/0x77
The buggy address belongs to the object at ffff888064295880
which belongs to the cache kmalloc-96 of size 96
The buggy address is located 0 bytes inside of
freed 96-byte region [ffff888064295880, ffff8880642958e0)
The buggy address belongs to the physical page:
page:ffffea000190a540 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x64295
ksm flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000800 ffff888014c42780 ffffea0000c8c240 dead000000000007
raw: 0000000000000000 0000000000200020 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 0x112c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 10902, tgid 10901 (syz-executor.3), ts 360371748345, free_ts 360348940469
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x2d4/0x350 mm/page_alloc.c:1533
prep_new_page mm/page_alloc.c:1540 [inline]
get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3311
__alloc_pages+0x22f/0x2440 mm/page_alloc.c:4567
__alloc_pages_node include/linux/gfp.h:238 [inline]
alloc_pages_node include/linux/gfp.h:261 [inline]
alloc_slab_page mm/slub.c:2190 [inline]
allocate_slab mm/slub.c:2354 [inline]
new_slab+0xcc/0x3a0 mm/slub.c:2407
___slab_alloc+0x4af/0x19a0 mm/slub.c:3540
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3625
__slab_alloc_node mm/slub.c:3678 [inline]
slab_alloc_node mm/slub.c:3850 [inline]
__do_kmalloc_node mm/slub.c:3980 [inline]
__kmalloc+0x3b8/0x440 mm/slub.c:3994
kmalloc_array include/linux/slab.h:627 [inline]
kcalloc include/linux/slab.h:658 [inline]
ext4_find_extent+0x95c/0xce0 fs/ext4/extents.c:914
ext4_ext_map_blocks+0x26b/0x5bb0 fs/ext4/extents.c:4143
ext4_map_blocks+0x61d/0x17d0 fs/ext4/inode.c:623
ext4_iomap_alloc fs/ext4/inode.c:3318 [inline]
ext4_iomap_begin+0x472/0x7d0 fs/ext4/inode.c:3368
iomap_iter+0x48b/0xff0 fs/iomap/iter.c:91
__iomap_dio_rw+0x6c4/0x1bd0 fs/iomap/direct-io.c:658
iomap_dio_rw+0x40/0xa0 fs/iomap/direct-io.c:748
ext4_dio_write_iter fs/ext4/file.c:577 [inline]
ext4_file_write_iter+0x12c6/0x1960 fs/ext4/file.c:696
call_write_iter include/linux/fs.h:2087 [inline]
iter_file_splice_write+0x908/0x10b0 fs/splice.c:743
page last free pid 5164 tgid 5164 stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1140 [inline]
free_unref_page_prepare+0x527/0xb10 mm/page_alloc.c:2346
free_unref_page+0x33/0x3c0 mm/page_alloc.c:2486
skb_free_frag include/linux/skbuff.h:3270 [inline]
skb_free_head+0xa6/0x1b0 net/core/skbuff.c:996
skb_release_data+0x5c0/0x880 net/core/skbuff.c:1028
skb_release_all net/core/skbuff.c:1094 [inline]
__kfree_skb+0x51/0x70 net/core/skbuff.c:1108
tcp_rcv_established+0xd72/0x20f0 net/ipv4/tcp_input.c:6080
tcp_v4_do_rcv+0x6ab/0xa50 net/ipv4/tcp_ipv4.c:1906
sk_backlog_rcv include/net/sock.h:1092 [inline]
__release_sock+0x31b/0x400 net/core/sock.c:2972
release_sock+0x5a/0x220 net/core/sock.c:3538
tcp_sendmsg+0x38/0x50 net/ipv4/tcp.c:1342
inet_sendmsg+0xb9/0x140 net/ipv4/af_inet.c:850
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
sock_write_iter+0x4b8/0x5c0 net/socket.c:1160
call_write_iter include/linux/fs.h:2087 [inline]
new_sync_write fs/read_write.c:497 [inline]
vfs_write+0x6de/0x1110 fs/read_write.c:590
ksys_write+0x1f8/0x260 fs/read_write.c:643
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x6f/0x77
Memory state around the buggy address:
ffff888064295780: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
ffff888064295800: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
>ffff888064295880: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
^
ffff888064295900: 00 00 00 00 00 00 00 00 03 fc fc fc fc fc fc fc
ffff888064295980: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
==================================================================
---
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [syzbot] [v9fs?] KASAN: slab-use-after-free Read in p9_fid_destroy
2024-03-07 8:14 [syzbot] [v9fs?] KASAN: slab-use-after-free Read in p9_fid_destroy syzbot
@ 2024-05-17 11:31 ` syzbot
0 siblings, 0 replies; 2+ messages in thread
From: syzbot @ 2024-05-17 11:31 UTC (permalink / raw
To: asmadeus, ericvh, linux-fsdevel, linux-kernel, linux_oss, lucho,
syzkaller-bugs, v9fs
syzbot has found a reproducer for the following issue on:
HEAD commit: ea5f6ad9ad96 Merge tag 'platform-drivers-x86-v6.10-1' of g..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17340168980000
kernel config: https://syzkaller.appspot.com/x/.config?x=f1cd4092753f97c5
dashboard link: https://syzkaller.appspot.com/bug?extid=d7c7a495a5e466c031b6
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1065b4f0980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11df3084980000
Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-ea5f6ad9.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a551265cc1bb/vmlinux-ea5f6ad9.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b814900d9571/bzImage-ea5f6ad9.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d7c7a495a5e466c031b6@syzkaller.appspotmail.com
9pnet: Found fid 3 not clunked
==================================================================
BUG: KASAN: slab-use-after-free in p9_fid_destroy+0xb5/0xd0 net/9p/client.c:885
Read of size 8 at addr ffff888023d14a00 by task syz-executor145/5220
CPU: 3 PID: 5220 Comm: syz-executor145 Not tainted 6.9.0-syzkaller-08284-gea5f6ad9ad96 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
print_address_description mm/kasan/report.c:377 [inline]
print_report+0xc3/0x620 mm/kasan/report.c:488
kasan_report+0xd9/0x110 mm/kasan/report.c:601
p9_fid_destroy+0xb5/0xd0 net/9p/client.c:885
p9_client_destroy+0x14c/0x480 net/9p/client.c:1071
v9fs_session_close+0x49/0x2d0 fs/9p/v9fs.c:506
v9fs_kill_super+0x4d/0xa0 fs/9p/vfs_super.c:196
deactivate_locked_super+0xbe/0x1a0 fs/super.c:472
deactivate_super+0xde/0x100 fs/super.c:505
cleanup_mnt+0x222/0x450 fs/namespace.c:1267
task_work_run+0x14e/0x250 kernel/task_work.c:180
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x278/0x2a0 kernel/entry/common.c:218
do_syscall_64+0xdc/0x260 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f373e54ddb7
Code: 07 00 48 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffe809881b8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f373e54ddb7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffe80988270
RBP: 00007ffe80988270 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000206 R12: 00007ffe809892e0
R13: 0000555582e557c0 R14: 431bde82d7b634db R15: 00007ffe80989300
</TASK>
Allocated by task 10647:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387
kmalloc include/linux/slab.h:628 [inline]
kzalloc include/linux/slab.h:749 [inline]
p9_fid_create+0x45/0x470 net/9p/client.c:854
p9_client_walk+0xc6/0x550 net/9p/client.c:1155
clone_fid fs/9p/fid.h:23 [inline]
v9fs_fid_clone fs/9p/fid.h:33 [inline]
v9fs_file_open+0x5b5/0xae0 fs/9p/vfs_file.c:56
do_dentry_open+0x8da/0x18c0 fs/open.c:955
do_open fs/namei.c:3650 [inline]
path_openat+0x1dfb/0x2990 fs/namei.c:3807
do_filp_open+0x1dc/0x430 fs/namei.c:3834
do_sys_openat2+0x17a/0x1e0 fs/open.c:1406
do_sys_open fs/open.c:1421 [inline]
__do_sys_creat fs/open.c:1497 [inline]
__se_sys_creat fs/open.c:1491 [inline]
__x64_sys_creat+0xcd/0x120 fs/open.c:1491
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 1091:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579
poison_slab_object mm/kasan/common.c:240 [inline]
__kasan_slab_free+0x11d/0x1a0 mm/kasan/common.c:256
kasan_slab_free include/linux/kasan.h:184 [inline]
slab_free_hook mm/slub.c:2121 [inline]
slab_free mm/slub.c:4353 [inline]
kfree+0x129/0x3a0 mm/slub.c:4463
p9_client_clunk+0x12a/0x170 net/9p/client.c:1457
p9_fid_put include/net/9p/client.h:280 [inline]
v9fs_free_request+0xdc/0x110 fs/9p/vfs_addr.c:138
netfs_free_request+0x22c/0x690 fs/netfs/objects.c:133
netfs_put_request+0x19b/0x1f0 fs/netfs/objects.c:165
netfs_write_collection_worker+0x19d0/0x59e0 fs/netfs/write_collect.c:701
process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231
process_scheduled_works kernel/workqueue.c:3312 [inline]
worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
The buggy address belongs to the object at ffff888023d14a00
which belongs to the cache kmalloc-96 of size 96
The buggy address is located 0 bytes inside of
freed 96-byte region [ffff888023d14a00, ffff888023d14a60)
The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x23d14
anon flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000800 ffff888015442280 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000200020 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 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1, tgid 1 (swapper/0), ts 12927324375, free_ts 10880195922
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x2d4/0x350 mm/page_alloc.c:1534
prep_new_page mm/page_alloc.c:1541 [inline]
get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3317
__alloc_pages+0x22b/0x2460 mm/page_alloc.c:4575
__alloc_pages_node include/linux/gfp.h:238 [inline]
alloc_pages_node include/linux/gfp.h:261 [inline]
alloc_slab_page mm/slub.c:2190 [inline]
allocate_slab mm/slub.c:2353 [inline]
new_slab+0xcc/0x3a0 mm/slub.c:2406
___slab_alloc+0xd28/0x1810 mm/slub.c:3592
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3682
__slab_alloc_node mm/slub.c:3735 [inline]
slab_alloc_node mm/slub.c:3908 [inline]
kmalloc_trace+0x306/0x340 mm/slub.c:4065
kmalloc include/linux/slab.h:628 [inline]
kzalloc include/linux/slab.h:749 [inline]
dev_pm_qos_expose_flags+0x96/0x310 drivers/base/power/qos.c:782
usb_hub_create_port_device+0x8fd/0xde0 drivers/usb/core/port.c:812
hub_configure drivers/usb/core/hub.c:1710 [inline]
hub_probe+0x1e31/0x3210 drivers/usb/core/hub.c:1965
usb_probe_interface+0x309/0x9d0 drivers/usb/core/driver.c:399
call_driver_probe drivers/base/dd.c:578 [inline]
really_probe+0x23e/0xa90 drivers/base/dd.c:656
__driver_probe_device+0x1de/0x440 drivers/base/dd.c:798
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:828
__device_attach_driver+0x1df/0x310 drivers/base/dd.c:956
bus_for_each_drv+0x157/0x1e0 drivers/base/bus.c:457
page last free pid 62 tgid 62 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1141 [inline]
free_unref_page_prepare+0x527/0xb10 mm/page_alloc.c:2347
free_unref_page+0x33/0x3c0 mm/page_alloc.c:2487
vfree+0x181/0x7a0 mm/vmalloc.c:3340
delayed_vfree_work+0x56/0x70 mm/vmalloc.c:3261
process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231
process_scheduled_works kernel/workqueue.c:3312 [inline]
worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Memory state around the buggy address:
ffff888023d14900: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
ffff888023d14980: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
>ffff888023d14a00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
^
ffff888023d14a80: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
ffff888023d14b00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
==================================================================
---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
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