[moderation] [bluetooth?] KASAN: slab-use-after-free Read in l2cap_register_user (2)
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syzbot
Sep 10, 2025, 11:26:30 PM (2 days ago) Sep 10
to syzkaller-upst...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: be5d4872e528 Add linux-next specific files for 20250905
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=14b45134580000
kernel config: https://syzkaller.appspot.com/x/.config?x=a726684450a7d788
dashboard link: https://syzkaller.appspot.com/bug?extid=8c83026c41ddde72cfb6
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
CC: [johan....@gmail.com linux-b...@vger.kernel.org linux-...@vger.kernel.org luiz....@gmail.com mar...@holtmann.org]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f67121360b62/disk-be5d4872.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/4f666ca2e57f/vmlinux-be5d4872.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e86b794b985e/bzImage-be5d4872.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8c8302...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-use-after-free in __mutex_waiter_is_first kernel/locking/mutex.c:183 [inline]
BUG: KASAN: slab-use-after-free in __mutex_lock_common kernel/locking/mutex.c:678 [inline]
BUG: KASAN: slab-use-after-free in __mutex_lock+0x801/0x1350 kernel/locking/mutex.c:760
Read of size 8 at addr ffff888029d700a0 by task syz.2.1302/15327
CPU: 0 UID: 0 PID: 15327 Comm: syz.2.1302 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
<TASK>
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xca/0x240 mm/kasan/report.c:482
kasan_report+0x118/0x150 mm/kasan/report.c:595
__mutex_waiter_is_first kernel/locking/mutex.c:183 [inline]
__mutex_lock_common kernel/locking/mutex.c:678 [inline]
__mutex_lock+0x801/0x1350 kernel/locking/mutex.c:760
l2cap_register_user+0x67/0x200 net/bluetooth/l2cap_core.c:1698
hidp_connection_add+0x1599/0x1a50 net/bluetooth/hidp/core.c:1378
do_hidp_sock_ioctl net/bluetooth/hidp/sock.c:81 [inline]
hidp_sock_ioctl+0x36c/0x560 net/bluetooth/hidp/sock.c:128
sock_do_ioctl+0xdc/0x300 net/socket.c:1238
sock_ioctl+0x576/0x790 net/socket.c:1359
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:598 [inline]
__se_sys_ioctl+0xf9/0x170 fs/ioctl.c:584
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5b23f8ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5b24d7c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f5b241c6090 RCX: 00007f5b23f8ebe9
RDX: 0000200000000340 RSI: 00000000400448c8 RDI: 0000000000000005
RBP: 00007f5b24011e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5b241c6128 R14: 00007f5b241c6090 R15: 00007ffdd36ecc38
</TASK>
Allocated by task 13937:
kasan_save_stack mm/kasan/common.c:56 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
poison_kmalloc_redzone mm/kasan/common.c:397 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:414
kasan_kmalloc include/linux/kasan.h:260 [inline]
__do_kmalloc_node mm/slub.c:5366 [inline]
__kmalloc_noprof+0x411/0x7f0 mm/slub.c:5378
kmalloc_noprof include/linux/slab.h:960 [inline]
kzalloc_noprof include/linux/slab.h:1090 [inline]
hci_alloc_dev_priv+0x28/0x2060 net/bluetooth/hci_core.c:2448
hci_alloc_dev include/net/bluetooth/hci_core.h:1729 [inline]
__vhci_create_device drivers/bluetooth/hci_vhci.c:421 [inline]
vhci_create_device+0x120/0x650 drivers/bluetooth/hci_vhci.c:479
vhci_get_user drivers/bluetooth/hci_vhci.c:536 [inline]
vhci_write+0x3ce/0x4a0 drivers/bluetooth/hci_vhci.c:616
new_sync_write fs/read_write.c:593 [inline]
vfs_write+0x5c9/0xb30 fs/read_write.c:686
ksys_write+0x145/0x250 fs/read_write.c:738
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 15304:
kasan_save_stack mm/kasan/common.c:56 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
__kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:587
kasan_save_free_info mm/kasan/kasan.h:406 [inline]
poison_slab_object mm/kasan/common.c:252 [inline]
__kasan_slab_free+0x5b/0x80 mm/kasan/common.c:284
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2484 [inline]
slab_free mm/slub.c:6121 [inline]
kfree+0x199/0x6d0 mm/slub.c:6329
bt_host_release+0x82/0x90 net/bluetooth/hci_sysfs.c:87
device_release+0x99/0x1c0 drivers/base/core.c:-1
kobject_cleanup lib/kobject.c:689 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x228/0x480 lib/kobject.c:737
vhci_release+0x15a/0x1a0 drivers/bluetooth/hci_vhci.c:691
__fput+0x449/0xa70 fs/file_table.c:468
task_work_run+0x1d1/0x260 kernel/task_work.c:227
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0x6b5/0x2300 kernel/exit.c:966
do_group_exit+0x21c/0x2d0 kernel/exit.c:1107
get_signal+0x1286/0x1340 kernel/signal.c:3034
arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop+0x75/0x130 kernel/entry/common.c:40
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:56
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:559
insert_work+0x3d/0x330 kernel/workqueue.c:2186
__queue_work+0xbaf/0xfb0 kernel/workqueue.c:2345
queue_work_on+0x181/0x270 kernel/workqueue.c:2392
process_one_work kernel/workqueue.c:3263 [inline]
process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3346
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
kthread+0x70e/0x8a0 kernel/kthread.c:463
ret_from_fork+0x47c/0x820 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Second to last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:56
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:559
insert_work+0x3d/0x330 kernel/workqueue.c:2186
__queue_work+0xcd2/0xfb0 kernel/workqueue.c:2341
call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747
expire_timers kernel/time/timer.c:1793 [inline]
__run_timers kernel/time/timer.c:2372 [inline]
__run_timer_base+0x646/0x860 kernel/time/timer.c:2384
run_timer_base kernel/time/timer.c:2393 [inline]
run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403
handle_softirqs+0x283/0x870 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
The buggy address belongs to the object at ffff888029d70000
which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 160 bytes inside of
freed 8192-byte region [ffff888029d70000, ffff888029d72000)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x29d70
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801a842280 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801a842280 0000000000000000 dead000000000001
head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
head: 00fff00000000003 ffffea0000a75c01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x528c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NORETRY|__GFP_COMP), pid 7889, tgid 7889 (syz-executor), ts 232401019934, free_ts 232391931842
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1850
prep_new_page mm/page_alloc.c:1858 [inline]
get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3863
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5153
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
alloc_slab_page mm/slub.c:2996 [inline]
allocate_slab+0x8a/0x330 mm/slub.c:3164
new_slab mm/slub.c:3218 [inline]
___slab_alloc+0xbd1/0x13f0 mm/slub.c:4420
__slab_alloc+0x55/0xa0 mm/slub.c:4511
__slab_alloc_node mm/slub.c:4586 [inline]
slab_alloc_node mm/slub.c:4996 [inline]
__do_kmalloc_node mm/slub.c:5365 [inline]
__kvmalloc_node_noprof+0x6ba/0x910 mm/slub.c:6527
kvmalloc_array_node_noprof include/linux/slab.h:1118 [inline]
__ptr_ring_init_queue_alloc_noprof include/linux/ptr_ring.h:471 [inline]
ptr_ring_init_noprof include/linux/ptr_ring.h:489 [inline]
wg_packet_queue_init+0xbc/0x320 drivers/net/wireguard/queueing.c:32
wg_newlink+0x326/0x640 drivers/net/wireguard/device.c:355
rtnl_newlink_create+0x30d/0xb00 net/core/rtnetlink.c:3825
__rtnl_newlink net/core/rtnetlink.c:3942 [inline]
rtnl_newlink+0x16d6/0x1c70 net/core/rtnetlink.c:4057
rtnetlink_rcv_msg+0x7cc/0xb70 net/core/rtnetlink.c:6946
netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2552
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x82c/0x9e0 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896
page last free pid 7995 tgid 7994 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1394 [inline]
__free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2900
discard_slab mm/slub.c:3262 [inline]
__put_partials+0x146/0x170 mm/slub.c:3727
put_cpu_partial+0x17c/0x250 mm/slub.c:3802
__slab_free+0x2b9/0x390 mm/slub.c:5555
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:349
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4710 [inline]
slab_alloc_node mm/slub.c:5008 [inline]
__do_kmalloc_node mm/slub.c:5365 [inline]
__kmalloc_node_track_caller_noprof+0x519/0x800 mm/slub.c:5385
__do_krealloc mm/slub.c:6406 [inline]
krealloc_node_align_noprof+0x140/0x390 mm/slub.c:6465
bch2_sb_realloc+0x353/0x640 fs/bcachefs/super-io.c:222
read_one_super+0x3a3/0x850 fs/bcachefs/super-io.c:759
__bch2_read_super+0x6c6/0x1040 fs/bcachefs/super-io.c:851
bch2_fs_open+0x1fe/0x2600 fs/bcachefs/super.c:2401
bch2_fs_get_tree+0x44f/0x1520 fs/bcachefs/fs.c:2472
vfs_get_tree+0x8f/0x2b0 fs/super.c:1751
fc_mount fs/namespace.c:1274 [inline]
do_new_mount_fc fs/namespace.c:3726 [inline]
do_new_mount+0x302/0xa10 fs/namespace.c:3802
Memory state around the buggy address:
ffff888029d6ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888029d70000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888029d70080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888029d70100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888029d70180: 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:
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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:
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(See the list of subsystem names on the web dashboard)
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: be5d4872e528 Add linux-next specific files for 20250905
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=14b45134580000
kernel config: https://syzkaller.appspot.com/x/.config?x=a726684450a7d788
dashboard link: https://syzkaller.appspot.com/bug?extid=8c83026c41ddde72cfb6
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
CC: [johan....@gmail.com linux-b...@vger.kernel.org linux-...@vger.kernel.org luiz....@gmail.com mar...@holtmann.org]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f67121360b62/disk-be5d4872.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/4f666ca2e57f/vmlinux-be5d4872.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e86b794b985e/bzImage-be5d4872.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8c8302...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: slab-use-after-free in __mutex_waiter_is_first kernel/locking/mutex.c:183 [inline]
BUG: KASAN: slab-use-after-free in __mutex_lock_common kernel/locking/mutex.c:678 [inline]
BUG: KASAN: slab-use-after-free in __mutex_lock+0x801/0x1350 kernel/locking/mutex.c:760
Read of size 8 at addr ffff888029d700a0 by task syz.2.1302/15327
CPU: 0 UID: 0 PID: 15327 Comm: syz.2.1302 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
<TASK>
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xca/0x240 mm/kasan/report.c:482
kasan_report+0x118/0x150 mm/kasan/report.c:595
__mutex_waiter_is_first kernel/locking/mutex.c:183 [inline]
__mutex_lock_common kernel/locking/mutex.c:678 [inline]
__mutex_lock+0x801/0x1350 kernel/locking/mutex.c:760
l2cap_register_user+0x67/0x200 net/bluetooth/l2cap_core.c:1698
hidp_connection_add+0x1599/0x1a50 net/bluetooth/hidp/core.c:1378
do_hidp_sock_ioctl net/bluetooth/hidp/sock.c:81 [inline]
hidp_sock_ioctl+0x36c/0x560 net/bluetooth/hidp/sock.c:128
sock_do_ioctl+0xdc/0x300 net/socket.c:1238
sock_ioctl+0x576/0x790 net/socket.c:1359
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:598 [inline]
__se_sys_ioctl+0xf9/0x170 fs/ioctl.c:584
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5b23f8ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5b24d7c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f5b241c6090 RCX: 00007f5b23f8ebe9
RDX: 0000200000000340 RSI: 00000000400448c8 RDI: 0000000000000005
RBP: 00007f5b24011e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5b241c6128 R14: 00007f5b241c6090 R15: 00007ffdd36ecc38
</TASK>
Allocated by task 13937:
kasan_save_stack mm/kasan/common.c:56 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
poison_kmalloc_redzone mm/kasan/common.c:397 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:414
kasan_kmalloc include/linux/kasan.h:260 [inline]
__do_kmalloc_node mm/slub.c:5366 [inline]
__kmalloc_noprof+0x411/0x7f0 mm/slub.c:5378
kmalloc_noprof include/linux/slab.h:960 [inline]
kzalloc_noprof include/linux/slab.h:1090 [inline]
hci_alloc_dev_priv+0x28/0x2060 net/bluetooth/hci_core.c:2448
hci_alloc_dev include/net/bluetooth/hci_core.h:1729 [inline]
__vhci_create_device drivers/bluetooth/hci_vhci.c:421 [inline]
vhci_create_device+0x120/0x650 drivers/bluetooth/hci_vhci.c:479
vhci_get_user drivers/bluetooth/hci_vhci.c:536 [inline]
vhci_write+0x3ce/0x4a0 drivers/bluetooth/hci_vhci.c:616
new_sync_write fs/read_write.c:593 [inline]
vfs_write+0x5c9/0xb30 fs/read_write.c:686
ksys_write+0x145/0x250 fs/read_write.c:738
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 15304:
kasan_save_stack mm/kasan/common.c:56 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
__kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:587
kasan_save_free_info mm/kasan/kasan.h:406 [inline]
poison_slab_object mm/kasan/common.c:252 [inline]
__kasan_slab_free+0x5b/0x80 mm/kasan/common.c:284
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2484 [inline]
slab_free mm/slub.c:6121 [inline]
kfree+0x199/0x6d0 mm/slub.c:6329
bt_host_release+0x82/0x90 net/bluetooth/hci_sysfs.c:87
device_release+0x99/0x1c0 drivers/base/core.c:-1
kobject_cleanup lib/kobject.c:689 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x228/0x480 lib/kobject.c:737
vhci_release+0x15a/0x1a0 drivers/bluetooth/hci_vhci.c:691
__fput+0x449/0xa70 fs/file_table.c:468
task_work_run+0x1d1/0x260 kernel/task_work.c:227
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0x6b5/0x2300 kernel/exit.c:966
do_group_exit+0x21c/0x2d0 kernel/exit.c:1107
get_signal+0x1286/0x1340 kernel/signal.c:3034
arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop+0x75/0x130 kernel/entry/common.c:40
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:56
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:559
insert_work+0x3d/0x330 kernel/workqueue.c:2186
__queue_work+0xbaf/0xfb0 kernel/workqueue.c:2345
queue_work_on+0x181/0x270 kernel/workqueue.c:2392
process_one_work kernel/workqueue.c:3263 [inline]
process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3346
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
kthread+0x70e/0x8a0 kernel/kthread.c:463
ret_from_fork+0x47c/0x820 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Second to last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:56
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:559
insert_work+0x3d/0x330 kernel/workqueue.c:2186
__queue_work+0xcd2/0xfb0 kernel/workqueue.c:2341
call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747
expire_timers kernel/time/timer.c:1793 [inline]
__run_timers kernel/time/timer.c:2372 [inline]
__run_timer_base+0x646/0x860 kernel/time/timer.c:2384
run_timer_base kernel/time/timer.c:2393 [inline]
run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403
handle_softirqs+0x283/0x870 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
The buggy address belongs to the object at ffff888029d70000
which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 160 bytes inside of
freed 8192-byte region [ffff888029d70000, ffff888029d72000)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x29d70
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801a842280 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801a842280 0000000000000000 dead000000000001
head: 0000000000000000 0000000000020002 00000000f5000000 0000000000000000
head: 00fff00000000003 ffffea0000a75c01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x528c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NORETRY|__GFP_COMP), pid 7889, tgid 7889 (syz-executor), ts 232401019934, free_ts 232391931842
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1850
prep_new_page mm/page_alloc.c:1858 [inline]
get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3863
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5153
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
alloc_slab_page mm/slub.c:2996 [inline]
allocate_slab+0x8a/0x330 mm/slub.c:3164
new_slab mm/slub.c:3218 [inline]
___slab_alloc+0xbd1/0x13f0 mm/slub.c:4420
__slab_alloc+0x55/0xa0 mm/slub.c:4511
__slab_alloc_node mm/slub.c:4586 [inline]
slab_alloc_node mm/slub.c:4996 [inline]
__do_kmalloc_node mm/slub.c:5365 [inline]
__kvmalloc_node_noprof+0x6ba/0x910 mm/slub.c:6527
kvmalloc_array_node_noprof include/linux/slab.h:1118 [inline]
__ptr_ring_init_queue_alloc_noprof include/linux/ptr_ring.h:471 [inline]
ptr_ring_init_noprof include/linux/ptr_ring.h:489 [inline]
wg_packet_queue_init+0xbc/0x320 drivers/net/wireguard/queueing.c:32
wg_newlink+0x326/0x640 drivers/net/wireguard/device.c:355
rtnl_newlink_create+0x30d/0xb00 net/core/rtnetlink.c:3825
__rtnl_newlink net/core/rtnetlink.c:3942 [inline]
rtnl_newlink+0x16d6/0x1c70 net/core/rtnetlink.c:4057
rtnetlink_rcv_msg+0x7cc/0xb70 net/core/rtnetlink.c:6946
netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2552
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x82c/0x9e0 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896
page last free pid 7995 tgid 7994 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1394 [inline]
__free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2900
discard_slab mm/slub.c:3262 [inline]
__put_partials+0x146/0x170 mm/slub.c:3727
put_cpu_partial+0x17c/0x250 mm/slub.c:3802
__slab_free+0x2b9/0x390 mm/slub.c:5555
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:349
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4710 [inline]
slab_alloc_node mm/slub.c:5008 [inline]
__do_kmalloc_node mm/slub.c:5365 [inline]
__kmalloc_node_track_caller_noprof+0x519/0x800 mm/slub.c:5385
__do_krealloc mm/slub.c:6406 [inline]
krealloc_node_align_noprof+0x140/0x390 mm/slub.c:6465
bch2_sb_realloc+0x353/0x640 fs/bcachefs/super-io.c:222
read_one_super+0x3a3/0x850 fs/bcachefs/super-io.c:759
__bch2_read_super+0x6c6/0x1040 fs/bcachefs/super-io.c:851
bch2_fs_open+0x1fe/0x2600 fs/bcachefs/super.c:2401
bch2_fs_get_tree+0x44f/0x1520 fs/bcachefs/fs.c:2472
vfs_get_tree+0x8f/0x2b0 fs/super.c:1751
fc_mount fs/namespace.c:1274 [inline]
do_new_mount_fc fs/namespace.c:3726 [inline]
do_new_mount+0x302/0xa10 fs/namespace.c:3802
Memory state around the buggy address:
ffff888029d6ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888029d70000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888029d70080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888029d70100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888029d70180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
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