[v5.15] KASAN: use-after-free Read in l2cap_connect_cfm (2)
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syzbot
Sep 24, 2025, 10:26:30 AM (2 days ago) Sep 24
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 43bb85222e53 Linux 5.15.193
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=131a54e2580000
kernel config: https://syzkaller.appspot.com/x/.config?x=e1bb6d24ef2164eb
dashboard link: https://syzkaller.appspot.com/bug?extid=d68bdee064365af6ea43
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/aa8fda38f146/disk-43bb8522.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/5cfcd43783fc/vmlinux-43bb8522.xz
kernel image: https://storage.googleapis.com/syzbot-assets/582ede77e278/bzImage-43bb8522.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d68bde...@syzkaller.appspotmail.com
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
</TASK>
kobject_add_internal failed for hci0:201 with -EEXIST, don't try to register things with the same name in the same directory.
Bluetooth: hci0: failed to register connection device
==================================================================
BUG: KASAN: use-after-free in l2cap_conn_ready net/bluetooth/l2cap_core.c:1758 [inline]
BUG: KASAN: use-after-free in l2cap_connect_cfm+0x6ff/0x10d0 net/bluetooth/l2cap_core.c:8320
Read of size 8 at addr ffff88802372b488 by task kworker/u5:5/4195
CPU: 1 PID: 4195 Comm: kworker/u5:5 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Workqueue: hci0 hci_rx_work
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
l2cap_conn_ready net/bluetooth/l2cap_core.c:1758 [inline]
l2cap_connect_cfm+0x6ff/0x10d0 net/bluetooth/l2cap_core.c:8320
hci_connect_cfm include/net/bluetooth/hci_core.h:1505 [inline]
le_conn_complete_evt+0xdaf/0x1590 net/bluetooth/hci_event.c:5439
hci_le_conn_complete_evt net/bluetooth/hci_event.c:5464 [inline]
hci_le_meta_evt+0x289/0x3b80 net/bluetooth/hci_event.c:6186
hci_event_packet+0xe05/0x12f0 net/bluetooth/hci_event.c:6535
hci_rx_work+0x255/0xa10 net/bluetooth/hci_core.c:5160
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 4195:
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:604 [inline]
kzalloc include/linux/slab.h:735 [inline]
l2cap_chan_create+0x4c/0x730 net/bluetooth/l2cap_core.c:469
l2cap_sock_alloc+0x13a/0x200 net/bluetooth/l2cap_sock.c:1882
l2cap_sock_new_connection_cb+0xd1/0x1c0 net/bluetooth/l2cap_sock.c:1479
l2cap_connect_cfm+0x35d/0x10d0 net/bluetooth/l2cap_core.c:8303
hci_connect_cfm include/net/bluetooth/hci_core.h:1505 [inline]
le_conn_complete_evt+0xdaf/0x1590 net/bluetooth/hci_event.c:5439
hci_le_conn_complete_evt net/bluetooth/hci_event.c:5464 [inline]
hci_le_meta_evt+0x289/0x3b80 net/bluetooth/hci_event.c:6186
hci_event_packet+0xe05/0x12f0 net/bluetooth/hci_event.c:6535
hci_rx_work+0x255/0xa10 net/bluetooth/hci_core.c:5160
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
Freed by task 5740:
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
l2cap_sock_cleanup_listen+0xea/0x270 net/bluetooth/l2cap_sock.c:1462
l2cap_sock_release+0x66/0x1e0 net/bluetooth/l2cap_sock.c:1420
__sock_release net/socket.c:649 [inline]
sock_close+0xd5/0x240 net/socket.c:1336
__fput+0x234/0x930 fs/file_table.c:311
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
Last potentially related work creation:
kasan_save_stack+0x35/0x60 mm/kasan/common.c:38
kasan_record_aux_stack+0xb8/0x100 mm/kasan/generic.c:348
__call_rcu kernel/rcu/tree.c:3011 [inline]
call_rcu+0x182/0x930 kernel/rcu/tree.c:3091
netlink_release+0x134f/0x1790 net/netlink/af_netlink.c:799
__sock_release net/socket.c:649 [inline]
sock_close+0xd5/0x240 net/socket.c:1336
__fput+0x234/0x930 fs/file_table.c:311
task_work_run+0x125/0x1a0 kernel/task_work.c:188
exit_task_work include/linux/task_work.h:33 [inline]
do_exit+0x61e/0x20a0 kernel/exit.c:883
do_group_exit+0x12e/0x300 kernel/exit.c:997
get_signal+0x6ca/0x12c0 kernel/signal.c:2900
arch_do_signal_or_restart+0xc1/0x1300 arch/x86/kernel/signal.c:867
handle_signal_work kernel/entry/common.c:154 [inline]
exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178
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 ffff88802372b000
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1160 bytes inside of
2048-byte region [ffff88802372b000, ffff88802372b800)
The buggy address belongs to the page:
page:ffffea00008dca00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x23728
head:ffffea00008dca00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 0000000100000001 ffff888016842000
raw: 0000000000000000 0000000080080008 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 0xd28c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4185, ts 57661443420, free_ts 57510910079
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_track_caller+0x1fc/0x3a0 mm/slub.c:4963
kmalloc_reserve net/core/skbuff.c:356 [inline]
pskb_expand_head+0x127/0x10f0 net/core/skbuff.c:1709
netlink_trim+0x180/0x220 net/netlink/af_netlink.c:1299
netlink_broadcast_filtered+0x7c/0x1170 net/netlink/af_netlink.c:1511
netlink_broadcast net/netlink/af_netlink.c:1556 [inline]
nlmsg_multicast include/net/netlink.h:1033 [inline]
nlmsg_notify+0xec/0x1a0 net/netlink/af_netlink.c:2550
rtnl_notify net/core/rtnetlink.c:759 [inline]
rtmsg_ifinfo_send net/core/rtnetlink.c:3908 [inline]
rtmsg_ifinfo_event net/core/rtnetlink.c:3923 [inline]
rtnetlink_event+0x13a/0x1a0 net/core/rtnetlink.c:5701
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_set_mac_address+0x2c4/0x3d0 net/core/dev.c:9114
dev_set_mac_address_user+0x2d/0x50 net/core/dev.c:9128
do_setlink+0x80d/0x3980 net/core/rtnetlink.c:2734
__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
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]
kmem_cache_alloc_node+0x12d/0x2d0 mm/slub.c:3261
__alloc_skb+0xf4/0x750 net/core/skbuff.c:415
alloc_skb include/linux/skbuff.h:1162 [inline]
alloc_skb_with_frags+0xa7/0x730 net/core/skbuff.c:6170
sock_alloc_send_pskb+0x853/0x980 net/core/sock.c:2531
unix_dgram_sendmsg+0x5ef/0x1890 net/unix/af_unix.c:1809
sock_sendmsg_nosec net/socket.c:704 [inline]
__sock_sendmsg net/socket.c:716 [inline]
__sys_sendto+0x423/0x580 net/socket.c:2063
__do_sys_sendto net/socket.c:2075 [inline]
__se_sys_sendto net/socket.c:2071 [inline]
__x64_sys_sendto+0xda/0xf0 net/socket.c:2071
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
Memory state around the buggy address:
ffff88802372b380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88802372b400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88802372b480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88802372b500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88802372b580: 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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If you want to undo deduplication, reply with:
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syzbot found the following issue on:
HEAD commit: 43bb85222e53 Linux 5.15.193
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=131a54e2580000
kernel config: https://syzkaller.appspot.com/x/.config?x=e1bb6d24ef2164eb
dashboard link: https://syzkaller.appspot.com/bug?extid=d68bdee064365af6ea43
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/aa8fda38f146/disk-43bb8522.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/5cfcd43783fc/vmlinux-43bb8522.xz
kernel image: https://storage.googleapis.com/syzbot-assets/582ede77e278/bzImage-43bb8522.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d68bde...@syzkaller.appspotmail.com
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
</TASK>
kobject_add_internal failed for hci0:201 with -EEXIST, don't try to register things with the same name in the same directory.
Bluetooth: hci0: failed to register connection device
==================================================================
BUG: KASAN: use-after-free in l2cap_conn_ready net/bluetooth/l2cap_core.c:1758 [inline]
BUG: KASAN: use-after-free in l2cap_connect_cfm+0x6ff/0x10d0 net/bluetooth/l2cap_core.c:8320
Read of size 8 at addr ffff88802372b488 by task kworker/u5:5/4195
CPU: 1 PID: 4195 Comm: kworker/u5:5 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Workqueue: hci0 hci_rx_work
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
l2cap_conn_ready net/bluetooth/l2cap_core.c:1758 [inline]
l2cap_connect_cfm+0x6ff/0x10d0 net/bluetooth/l2cap_core.c:8320
hci_connect_cfm include/net/bluetooth/hci_core.h:1505 [inline]
le_conn_complete_evt+0xdaf/0x1590 net/bluetooth/hci_event.c:5439
hci_le_conn_complete_evt net/bluetooth/hci_event.c:5464 [inline]
hci_le_meta_evt+0x289/0x3b80 net/bluetooth/hci_event.c:6186
hci_event_packet+0xe05/0x12f0 net/bluetooth/hci_event.c:6535
hci_rx_work+0x255/0xa10 net/bluetooth/hci_core.c:5160
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 4195:
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:604 [inline]
kzalloc include/linux/slab.h:735 [inline]
l2cap_chan_create+0x4c/0x730 net/bluetooth/l2cap_core.c:469
l2cap_sock_alloc+0x13a/0x200 net/bluetooth/l2cap_sock.c:1882
l2cap_sock_new_connection_cb+0xd1/0x1c0 net/bluetooth/l2cap_sock.c:1479
l2cap_connect_cfm+0x35d/0x10d0 net/bluetooth/l2cap_core.c:8303
hci_connect_cfm include/net/bluetooth/hci_core.h:1505 [inline]
le_conn_complete_evt+0xdaf/0x1590 net/bluetooth/hci_event.c:5439
hci_le_conn_complete_evt net/bluetooth/hci_event.c:5464 [inline]
hci_le_meta_evt+0x289/0x3b80 net/bluetooth/hci_event.c:6186
hci_event_packet+0xe05/0x12f0 net/bluetooth/hci_event.c:6535
hci_rx_work+0x255/0xa10 net/bluetooth/hci_core.c:5160
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
Freed by task 5740:
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
l2cap_sock_cleanup_listen+0xea/0x270 net/bluetooth/l2cap_sock.c:1462
l2cap_sock_release+0x66/0x1e0 net/bluetooth/l2cap_sock.c:1420
__sock_release net/socket.c:649 [inline]
sock_close+0xd5/0x240 net/socket.c:1336
__fput+0x234/0x930 fs/file_table.c:311
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
Last potentially related work creation:
kasan_save_stack+0x35/0x60 mm/kasan/common.c:38
kasan_record_aux_stack+0xb8/0x100 mm/kasan/generic.c:348
__call_rcu kernel/rcu/tree.c:3011 [inline]
call_rcu+0x182/0x930 kernel/rcu/tree.c:3091
netlink_release+0x134f/0x1790 net/netlink/af_netlink.c:799
__sock_release net/socket.c:649 [inline]
sock_close+0xd5/0x240 net/socket.c:1336
__fput+0x234/0x930 fs/file_table.c:311
task_work_run+0x125/0x1a0 kernel/task_work.c:188
exit_task_work include/linux/task_work.h:33 [inline]
do_exit+0x61e/0x20a0 kernel/exit.c:883
do_group_exit+0x12e/0x300 kernel/exit.c:997
get_signal+0x6ca/0x12c0 kernel/signal.c:2900
arch_do_signal_or_restart+0xc1/0x1300 arch/x86/kernel/signal.c:867
handle_signal_work kernel/entry/common.c:154 [inline]
exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178
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 ffff88802372b000
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1160 bytes inside of
2048-byte region [ffff88802372b000, ffff88802372b800)
The buggy address belongs to the page:
page:ffffea00008dca00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x23728
head:ffffea00008dca00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 0000000100000001 ffff888016842000
raw: 0000000000000000 0000000080080008 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 0xd28c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4185, ts 57661443420, free_ts 57510910079
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_track_caller+0x1fc/0x3a0 mm/slub.c:4963
kmalloc_reserve net/core/skbuff.c:356 [inline]
pskb_expand_head+0x127/0x10f0 net/core/skbuff.c:1709
netlink_trim+0x180/0x220 net/netlink/af_netlink.c:1299
netlink_broadcast_filtered+0x7c/0x1170 net/netlink/af_netlink.c:1511
netlink_broadcast net/netlink/af_netlink.c:1556 [inline]
nlmsg_multicast include/net/netlink.h:1033 [inline]
nlmsg_notify+0xec/0x1a0 net/netlink/af_netlink.c:2550
rtnl_notify net/core/rtnetlink.c:759 [inline]
rtmsg_ifinfo_send net/core/rtnetlink.c:3908 [inline]
rtmsg_ifinfo_event net/core/rtnetlink.c:3923 [inline]
rtnetlink_event+0x13a/0x1a0 net/core/rtnetlink.c:5701
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_set_mac_address+0x2c4/0x3d0 net/core/dev.c:9114
dev_set_mac_address_user+0x2d/0x50 net/core/dev.c:9128
do_setlink+0x80d/0x3980 net/core/rtnetlink.c:2734
__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
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]
kmem_cache_alloc_node+0x12d/0x2d0 mm/slub.c:3261
__alloc_skb+0xf4/0x750 net/core/skbuff.c:415
alloc_skb include/linux/skbuff.h:1162 [inline]
alloc_skb_with_frags+0xa7/0x730 net/core/skbuff.c:6170
sock_alloc_send_pskb+0x853/0x980 net/core/sock.c:2531
unix_dgram_sendmsg+0x5ef/0x1890 net/unix/af_unix.c:1809
sock_sendmsg_nosec net/socket.c:704 [inline]
__sock_sendmsg net/socket.c:716 [inline]
__sys_sendto+0x423/0x580 net/socket.c:2063
__do_sys_sendto net/socket.c:2075 [inline]
__se_sys_sendto net/socket.c:2071 [inline]
__x64_sys_sendto+0xda/0xf0 net/socket.c:2071
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
Memory state around the buggy address:
ffff88802372b380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88802372b400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88802372b480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88802372b500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88802372b580: 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.
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
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
syzbot
Sep 24, 2025, 8:05:30 PM (2 days ago) Sep 24
to syzkaller...@googlegroups.com
syzbot has found a reproducer for the following issue on:
HEAD commit: 43bb85222e53 Linux 5.15.193
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=14262ce2580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16546142580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/aa8fda38f146/disk-43bb8522.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/5cfcd43783fc/vmlinux-43bb8522.xz
kernel image: https://storage.googleapis.com/syzbot-assets/582ede77e278/bzImage-43bb8522.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d68bde...@syzkaller.appspotmail.com
CPU: 0 PID: 4264 Comm: kworker/u5:1 Not tainted syzkaller #0
kasan_save_stack mm/kasan/common.c:38 [inline]
head:ffffea0001eff600 order:3 compound_mapcount:0 compound_pincount:0
kmem_cache_alloc_trace+0x1a5/0x2a0 mm/slub.c:3250
kmem_cache_alloc+0x100/0x290 mm/slub.c:3238
ptlock_alloc+0x1c/0x60 mm/memory.c:5556
ptlock_init include/linux/mm.h:2241 [inline]
pgtable_pte_page_ctor include/linux/mm.h:2268 [inline]
__pte_alloc_one include/asm-generic/pgalloc.h:66 [inline]
pte_alloc_one+0xc5/0x2f0 arch/x86/mm/pgtable.c:33
do_fault_around mm/memory.c:4237 [inline]
do_read_fault mm/memory.c:4258 [inline]
do_fault mm/memory.c:4392 [inline]
handle_pte_fault mm/memory.c:4650 [inline]
__handle_mm_fault mm/memory.c:4785 [inline]
handle_mm_fault+0x2518/0x43c0 mm/memory.c:4883
do_user_addr_fault+0x489/0xc80 arch/x86/mm/fault.c:1357
handle_page_fault arch/x86/mm/fault.c:1445 [inline]
exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1501
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
Memory state around the buggy address:
ffff88807bfde380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807bfde400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807bfde480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88807bfde500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807bfde580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
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.
HEAD commit: 43bb85222e53 Linux 5.15.193
git tree: linux-5.15.y
kernel config: https://syzkaller.appspot.com/x/.config?x=e1bb6d24ef2164eb
dashboard link: https://syzkaller.appspot.com/bug?extid=d68bdee064365af6ea43
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1716cf12580000
dashboard link: https://syzkaller.appspot.com/bug?extid=d68bdee064365af6ea43
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16546142580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/aa8fda38f146/disk-43bb8522.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/5cfcd43783fc/vmlinux-43bb8522.xz
kernel image: https://storage.googleapis.com/syzbot-assets/582ede77e278/bzImage-43bb8522.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d68bde...@syzkaller.appspotmail.com
</TASK>
kobject_add_internal failed for hci0:201 with -EEXIST, don't try to register things with the same name in the same directory.
Bluetooth: hci0: failed to register connection device
==================================================================
BUG: KASAN: use-after-free in l2cap_conn_ready net/bluetooth/l2cap_core.c:1758 [inline]
BUG: KASAN: use-after-free in l2cap_connect_cfm+0x6ff/0x10d0 net/bluetooth/l2cap_core.c:8320
Read of size 8 at addr ffff88807bfde488 by task kworker/u5:1/4264
kobject_add_internal failed for hci0:201 with -EEXIST, don't try to register things with the same name in the same directory.
Bluetooth: hci0: failed to register connection device
==================================================================
BUG: KASAN: use-after-free in l2cap_conn_ready net/bluetooth/l2cap_core.c:1758 [inline]
BUG: KASAN: use-after-free in l2cap_connect_cfm+0x6ff/0x10d0 net/bluetooth/l2cap_core.c:8320
CPU: 0 PID: 4264 Comm: kworker/u5:1 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Workqueue: hci0 hci_rx_work
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
l2cap_conn_ready net/bluetooth/l2cap_core.c:1758 [inline]
l2cap_connect_cfm+0x6ff/0x10d0 net/bluetooth/l2cap_core.c:8320
hci_connect_cfm include/net/bluetooth/hci_core.h:1505 [inline]
le_conn_complete_evt+0xdaf/0x1590 net/bluetooth/hci_event.c:5439
hci_le_conn_complete_evt net/bluetooth/hci_event.c:5464 [inline]
hci_le_meta_evt+0x289/0x3b80 net/bluetooth/hci_event.c:6186
hci_event_packet+0xe05/0x12f0 net/bluetooth/hci_event.c:6535
hci_rx_work+0x255/0xa10 net/bluetooth/hci_core.c:5160
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 4264:
Workqueue: hci0 hci_rx_work
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
l2cap_conn_ready net/bluetooth/l2cap_core.c:1758 [inline]
l2cap_connect_cfm+0x6ff/0x10d0 net/bluetooth/l2cap_core.c:8320
hci_connect_cfm include/net/bluetooth/hci_core.h:1505 [inline]
le_conn_complete_evt+0xdaf/0x1590 net/bluetooth/hci_event.c:5439
hci_le_conn_complete_evt net/bluetooth/hci_event.c:5464 [inline]
hci_le_meta_evt+0x289/0x3b80 net/bluetooth/hci_event.c:6186
hci_event_packet+0xe05/0x12f0 net/bluetooth/hci_event.c:6535
hci_rx_work+0x255/0xa10 net/bluetooth/hci_core.c:5160
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>
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:604 [inline]
kzalloc include/linux/slab.h:735 [inline]
l2cap_chan_create+0x4c/0x730 net/bluetooth/l2cap_core.c:469
l2cap_sock_alloc+0x13a/0x200 net/bluetooth/l2cap_sock.c:1882
l2cap_sock_new_connection_cb+0xd1/0x1c0 net/bluetooth/l2cap_sock.c:1479
l2cap_connect_cfm+0x35d/0x10d0 net/bluetooth/l2cap_core.c:8303
hci_connect_cfm include/net/bluetooth/hci_core.h:1505 [inline]
le_conn_complete_evt+0xdaf/0x1590 net/bluetooth/hci_event.c:5439
hci_le_conn_complete_evt net/bluetooth/hci_event.c:5464 [inline]
hci_le_meta_evt+0x289/0x3b80 net/bluetooth/hci_event.c:6186
hci_event_packet+0xe05/0x12f0 net/bluetooth/hci_event.c:6535
hci_rx_work+0x255/0xa10 net/bluetooth/hci_core.c:5160
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
Freed by task 4357:
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:604 [inline]
kzalloc include/linux/slab.h:735 [inline]
l2cap_chan_create+0x4c/0x730 net/bluetooth/l2cap_core.c:469
l2cap_sock_alloc+0x13a/0x200 net/bluetooth/l2cap_sock.c:1882
l2cap_sock_new_connection_cb+0xd1/0x1c0 net/bluetooth/l2cap_sock.c:1479
l2cap_connect_cfm+0x35d/0x10d0 net/bluetooth/l2cap_core.c:8303
hci_connect_cfm include/net/bluetooth/hci_core.h:1505 [inline]
le_conn_complete_evt+0xdaf/0x1590 net/bluetooth/hci_event.c:5439
hci_le_conn_complete_evt net/bluetooth/hci_event.c:5464 [inline]
hci_le_meta_evt+0x289/0x3b80 net/bluetooth/hci_event.c:6186
hci_event_packet+0xe05/0x12f0 net/bluetooth/hci_event.c:6535
hci_rx_work+0x255/0xa10 net/bluetooth/hci_core.c:5160
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
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
l2cap_sock_cleanup_listen+0xea/0x270 net/bluetooth/l2cap_sock.c:1462
l2cap_sock_release+0x66/0x1e0 net/bluetooth/l2cap_sock.c:1420
__sock_release net/socket.c:649 [inline]
sock_close+0xd5/0x240 net/socket.c:1336
__fput+0x234/0x930 fs/file_table.c:311
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 ffff88807bfde000
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
l2cap_sock_cleanup_listen+0xea/0x270 net/bluetooth/l2cap_sock.c:1462
l2cap_sock_release+0x66/0x1e0 net/bluetooth/l2cap_sock.c:1420
__sock_release net/socket.c:649 [inline]
sock_close+0xd5/0x240 net/socket.c:1336
__fput+0x234/0x930 fs/file_table.c:311
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
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1160 bytes inside of
2048-byte region [ffff88807bfde000, ffff88807bfde800)
The buggy address is located 1160 bytes inside of
The buggy address belongs to the page:
page:ffffea0001eff600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7bfd8
head:ffffea0001eff600 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000122 ffff888016842000
raw: 0000000000000000 0000000080080008 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 0x152a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 4264, ts 80764463869, free_ts 80463257214
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
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]
slab_alloc mm/slub.c:3233 [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]
kmem_cache_alloc_trace+0x1a5/0x2a0 mm/slub.c:3250
kmalloc include/linux/slab.h:604 [inline]
kzalloc include/linux/slab.h:735 [inline]
l2cap_chan_create+0x4c/0x730 net/bluetooth/l2cap_core.c:469
l2cap_sock_alloc+0x13a/0x200 net/bluetooth/l2cap_sock.c:1882
l2cap_sock_new_connection_cb+0xd1/0x1c0 net/bluetooth/l2cap_sock.c:1479
l2cap_connect_cfm+0x35d/0x10d0 net/bluetooth/l2cap_core.c:8303
hci_connect_cfm include/net/bluetooth/hci_core.h:1505 [inline]
le_conn_complete_evt+0xdaf/0x1590 net/bluetooth/hci_event.c:5439
hci_le_conn_complete_evt net/bluetooth/hci_event.c:5464 [inline]
hci_le_meta_evt+0x289/0x3b80 net/bluetooth/hci_event.c:6186
hci_event_packet+0xe05/0x12f0 net/bluetooth/hci_event.c:6535
hci_rx_work+0x255/0xa10 net/bluetooth/hci_core.c:5160
process_one_work+0x863/0x1000 kernel/workqueue.c:2310
worker_thread+0xaa8/0x12a0 kernel/workqueue.c:2457
kthread+0x436/0x520 kernel/kthread.c:334
kzalloc include/linux/slab.h:735 [inline]
l2cap_chan_create+0x4c/0x730 net/bluetooth/l2cap_core.c:469
l2cap_sock_alloc+0x13a/0x200 net/bluetooth/l2cap_sock.c:1882
l2cap_sock_new_connection_cb+0xd1/0x1c0 net/bluetooth/l2cap_sock.c:1479
l2cap_connect_cfm+0x35d/0x10d0 net/bluetooth/l2cap_core.c:8303
hci_connect_cfm include/net/bluetooth/hci_core.h:1505 [inline]
le_conn_complete_evt+0xdaf/0x1590 net/bluetooth/hci_event.c:5439
hci_le_conn_complete_evt net/bluetooth/hci_event.c:5464 [inline]
hci_le_meta_evt+0x289/0x3b80 net/bluetooth/hci_event.c:6186
hci_event_packet+0xe05/0x12f0 net/bluetooth/hci_event.c:6535
hci_rx_work+0x255/0xa10 net/bluetooth/hci_core.c:5160
process_one_work+0x863/0x1000 kernel/workqueue.c:2310
worker_thread+0xaa8/0x12a0 kernel/workqueue.c:2457
kthread+0x436/0x520 kernel/kthread.c:334
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]
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]
kmem_cache_alloc+0x100/0x290 mm/slub.c:3238
ptlock_alloc+0x1c/0x60 mm/memory.c:5556
ptlock_init include/linux/mm.h:2241 [inline]
pgtable_pte_page_ctor include/linux/mm.h:2268 [inline]
__pte_alloc_one include/asm-generic/pgalloc.h:66 [inline]
pte_alloc_one+0xc5/0x2f0 arch/x86/mm/pgtable.c:33
do_fault_around mm/memory.c:4237 [inline]
do_read_fault mm/memory.c:4258 [inline]
do_fault mm/memory.c:4392 [inline]
handle_pte_fault mm/memory.c:4650 [inline]
__handle_mm_fault mm/memory.c:4785 [inline]
handle_mm_fault+0x2518/0x43c0 mm/memory.c:4883
do_user_addr_fault+0x489/0xc80 arch/x86/mm/fault.c:1357
handle_page_fault arch/x86/mm/fault.c:1445 [inline]
exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1501
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
Memory state around the buggy address:
ffff88807bfde400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807bfde480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88807bfde500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807bfde580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
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