KASAN: use-after-free Write in hci_conn_drop

Status: upstream: reported syz repro on 2026/03/12 20:44
Reported-by: syzbot+39c01a9cfb028c5bf498@syzkaller.appspotmail.com
First crash: 151d, last: 26d
▶ ▼ Bug presence (1)
Date Name Commit Repro Result
2026/06/29 upstream (ToT) dc59e4fea9d8 syz Failed due to an error; will retry later
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: slab-use-after-free Write in hci_conn_drop (2) bluetooth 22 syz, C done 7 881d 1012d 0/29 auto-obsoleted due to no activity on 2024/06/21 00:39
upstream KASAN: slab-use-after-free Write in hci_conn_drop (3) bluetooth prio:high 22 syz, C error 1023 130d 250d 0/29 auto-obsoleted due to no activity on 2026/06/11 08:58
upstream KASAN: slab-use-after-free Write in hci_conn_drop bluetooth 22 1 1181d 1176d 0/29 auto-obsoleted due to no activity on 2023/08/25 20:26

Sample crash report:
==================================================================
BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:102 [inline]
BUG: KASAN: use-after-free in atomic_dec_and_test include/linux/atomic/atomic-instrumented.h:575 [inline]
BUG: KASAN: use-after-free in hci_conn_drop+0x34/0x2b4 include/net/bluetooth/hci_core.h:1422
Write of size 4 at addr ffff0000d821c010 by task syz.0.2976/13024

CPU: 1 PID: 13024 Comm: syz.0.2976 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/02/2026
Call trace:
 dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106
 print_address_description+0x88/0x218 mm/kasan/report.c:316
 print_report+0x50/0x68 mm/kasan/report.c:420
 kasan_report+0xa8/0xfc mm/kasan/report.c:524
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x258/0x290 mm/kasan/generic.c:189
 __kasan_check_write+0x2c/0x3c mm/kasan/shadow.c:37
 instrument_atomic_read_write include/linux/instrumented.h:102 [inline]
 atomic_dec_and_test include/linux/atomic/atomic-instrumented.h:575 [inline]
 hci_conn_drop+0x34/0x2b4 include/net/bluetooth/hci_core.h:1422
 sco_chan_del net/bluetooth/sco.c:184 [inline]
 __sco_sock_close+0x140/0x800 net/bluetooth/sco.c:492
 sco_sock_close net/bluetooth/sco.c:507 [inline]
 sco_sock_release+0xb0/0x2b8 net/bluetooth/sco.c:1303
 __sock_release net/socket.c:654 [inline]
 sock_close+0xac/0x1ec net/socket.c:1400
 __fput+0x1b4/0x7b0 fs/file_table.c:320
 ____fput+0x20/0x30 fs/file_table.c:348
 task_work_run+0x1f4/0x280 kernel/task_work.c:203
 get_signal+0x1140/0x133c kernel/signal.c:2649
 do_signal arch/arm64/kernel/signal.c:1095 [inline]
 do_notify_resume+0x364/0x2c84 arch/arm64/kernel/signal.c:1148
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
 el0_svc+0x98/0x128 arch/arm64/kernel/entry-common.c:638
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

Allocated by task 12972:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:53
 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:375 [inline]
 __kasan_kmalloc+0xa0/0xb8 mm/kasan/common.c:384
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 kmalloc_trace+0x7c/0x94 mm/slab_common.c:1031
 kmalloc include/linux/slab.h:563 [inline]
 kzalloc include/linux/slab.h:699 [inline]
 hci_conn_add+0xc4/0x10d8 net/bluetooth/hci_conn.c:990
 hci_connect_sco+0x94/0x36c net/bluetooth/hci_conn.c:1630
 sco_connect net/bluetooth/sco.c:280 [inline]
 sco_sock_connect+0x260/0x750 net/bluetooth/sco.c:645
 __sys_connect_file net/socket.c:2011 [inline]
 __sys_connect+0x28c/0x2b4 net/socket.c:2028
 __do_sys_connect net/socket.c:2038 [inline]
 __se_sys_connect net/socket.c:2035 [inline]
 __arm64_sys_connect+0x7c/0x94 net/socket.c:2035
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

Freed by task 12976:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:53
 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:516
 ____kasan_slab_free+0x148/0x1b0 mm/kasan/common.c:237
 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:245
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1729 [inline]
 slab_free_freelist_hook+0x16c/0x1e8 mm/slub.c:1755
 slab_free mm/slub.c:3687 [inline]
 __kmem_cache_free+0xbc/0x21c mm/slub.c:3700
 kfree+0xd0/0x1a8 mm/slab_common.c:988
 bt_link_release+0x20/0x30 net/bluetooth/hci_sysfs.c:14
 device_release+0x94/0x1b4 drivers/base/core.c:-1
 kobject_cleanup lib/kobject.c:681 [inline]
 kobject_release lib/kobject.c:712 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x2a8/0x41c lib/kobject.c:729
 put_device+0x28/0x40 drivers/base/core.c:3820
 hci_conn_del_sysfs+0x78/0x160 net/bluetooth/hci_sysfs.c:60
 hci_conn_cleanup+0x4e0/0x68c net/bluetooth/hci_conn.c:172
 hci_conn_del+0x340/0x598 net/bluetooth/hci_conn.c:1152
 hci_conn_del+0x2cc/0x598 net/bluetooth/hci_conn.c:1111
 hci_conn_failed+0x1dc/0x278 net/bluetooth/hci_conn.c:1249
 hci_abort_conn_sync+0x8f8/0xb5c net/bluetooth/hci_sync.c:5591
 hci_disconnect_all_sync net/bluetooth/hci_sync.c:5604 [inline]
 hci_suspend_sync+0x4bc/0xd88 net/bluetooth/hci_sync.c:6086
 hci_suspend_dev+0x150/0x2d4 net/bluetooth/hci_core.c:2857
 hci_suspend_notifier+0xe4/0x270 net/bluetooth/hci_core.c:2424
 notifier_call_chain kernel/notifier.c:87 [inline]
 notifier_call_chain_robust+0xe0/0x288 kernel/notifier.c:122
 blocking_notifier_call_chain_robust+0x74/0xa8 kernel/notifier.c:347
 pm_notifier_call_chain_robust+0x34/0x60 kernel/power/main.c:90
 snapshot_open+0x17c/0x268 kernel/power/user.c:77
 misc_open+0x310/0x388 drivers/char/misc.c:145
 chrdev_open+0x3d0/0x51c fs/char_dev.c:414
 do_dentry_open+0x738/0xf8c fs/open.c:882
 vfs_open+0x7c/0x90 fs/open.c:1015
 do_open fs/namei.c:3634 [inline]
 path_openat+0x1fc0/0x27a0 fs/namei.c:3791
 do_filp_open+0x198/0x38c fs/namei.c:3818
 do_sys_openat2+0x134/0x3fc fs/open.c:1320
 do_sys_open fs/open.c:1336 [inline]
 __do_sys_openat fs/open.c:1352 [inline]
 __se_sys_openat fs/open.c:1347 [inline]
 __arm64_sys_openat+0x11c/0x150 fs/open.c:1347
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

Last potentially related work creation:
 kasan_save_stack+0x40/0x70 mm/kasan/common.c:46
 __kasan_record_aux_stack+0xc0/0xdc mm/kasan/generic.c:486
 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496
 insert_work+0x64/0x37c kernel/workqueue.c:1361
 __queue_work+0xd00/0x1280 kernel/workqueue.c:1520
 __queue_delayed_work kernel/workqueue.c:1668 [inline]
 queue_delayed_work_on+0x208/0x30c kernel/workqueue.c:1704
 queue_delayed_work include/linux/workqueue.h:527 [inline]
 hci_conn_drop+0x194/0x2b4 include/net/bluetooth/hci_core.h:1448
 sco_chan_del net/bluetooth/sco.c:184 [inline]
 __sco_sock_close+0x140/0x800 net/bluetooth/sco.c:492
 sco_sock_close net/bluetooth/sco.c:507 [inline]
 sco_sock_release+0xb0/0x2b8 net/bluetooth/sco.c:1303
 __sock_release net/socket.c:654 [inline]
 sock_close+0xac/0x1ec net/socket.c:1400
 __fput+0x1b4/0x7b0 fs/file_table.c:320
 ____fput+0x20/0x30 fs/file_table.c:348
 task_work_run+0x1f4/0x280 kernel/task_work.c:203
 get_signal+0x1140/0x133c kernel/signal.c:2649
 do_signal arch/arm64/kernel/signal.c:1095 [inline]
 do_notify_resume+0x364/0x2c84 arch/arm64/kernel/signal.c:1148
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
 el0_svc+0x98/0x128 arch/arm64/kernel/entry-common.c:638
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

The buggy address belongs to the object at ffff0000d821c000
 which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 16 bytes inside of
 4096-byte region [ffff0000d821c000, ffff0000d821d000)

The buggy address belongs to the physical page:
page:00000000b88de1f4 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x118218
head:00000000b88de1f4 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000010200 fffffc00036eb000 dead000000000002 ffff0000c0002a80
raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000d821bf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000d821bf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff0000d821c000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                         ^
 ffff0000d821c080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000d821c100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
------------[ cut here ]------------
ODEBUG: assert_init not available (active state 0) object type: timer_list hint: hci_le_remove_cig net/bluetooth/hci_conn.c:-1 [inline]
ODEBUG: assert_init not available (active state 0) object type: timer_list hint: hci_conn_timeout+0x0/0x41c net/bluetooth/hci_conn.c:980
WARNING: CPU: 1 PID: 13024 at lib/debugobjects.c:518 debug_print_object+0x140/0x1c8 lib/debugobjects.c:515
Modules linked in:
CPU: 1 PID: 13024 Comm: syz.0.2976 Tainted: G    B              syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/02/2026
pstate: 624000c5 (nZCv daIF +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : debug_print_object+0x140/0x1c8 lib/debugobjects.c:515
lr : debug_print_object+0x140/0x1c8 lib/debugobjects.c:515
sp : ffff8000259d7660
x29: ffff8000259d7660 x28: 1fffe0001afebc54 x27: ffff0000f0b0e210
x26: 0000000000000004 x25: ffff8000259d76c8 x24: dfff800000000000
x23: 0000000000000000 x22: ffff800010d086a8 x21: ffff80001218b1e0
x20: ffff800011cbb280 x19: ffff80001218ad20 x18: 1fffe00033e8417e
x17: 203a657079742074 x16: ffff800011b3e320 x15: 2065746174732065
x14: 0000000000000001 x13: 1fffe00033e841a3 x12: 0000000000000000
x11: ff00800008195f70 x10: 0000000000000000 x9 : 0dd7a11acb818800
x8 : 0dd7a11acb818800 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff8000259d70f8 x4 : ffff800015414e60 x3 : ffff8000085404d8
x2 : 0000000000000001 x1 : 0000000100000000 x0 : 0000000000000000
Call trace:
 debug_print_object+0x140/0x1c8 lib/debugobjects.c:515
 debug_object_assert_init+0x250/0x2c8 lib/debugobjects.c:900
 debug_timer_assert_init kernel/time/timer.c:792 [inline]
 debug_assert_init kernel/time/timer.c:837 [inline]
 __timer_delete+0x50/0x214 kernel/time/timer.c:1321
 timer_delete+0x24/0x34 kernel/time/timer.c:1361
 del_timer include/linux/timer.h:213 [inline]
 try_to_grab_pending+0xa4/0x658 kernel/workqueue.c:1278
 __cancel_work+0x44/0x224 kernel/workqueue.c:3251
 cancel_delayed_work+0x24/0x38 kernel/workqueue.c:3289
 hci_conn_drop+0x14c/0x2b4 include/net/bluetooth/hci_core.h:1447
 sco_chan_del net/bluetooth/sco.c:184 [inline]
 __sco_sock_close+0x140/0x800 net/bluetooth/sco.c:492
 sco_sock_close net/bluetooth/sco.c:507 [inline]
 sco_sock_release+0xb0/0x2b8 net/bluetooth/sco.c:1303
 __sock_release net/socket.c:654 [inline]
 sock_close+0xac/0x1ec net/socket.c:1400
 __fput+0x1b4/0x7b0 fs/file_table.c:320
 ____fput+0x20/0x30 fs/file_table.c:348
 task_work_run+0x1f4/0x280 kernel/task_work.c:203
 get_signal+0x1140/0x133c kernel/signal.c:2649
 do_signal arch/arm64/kernel/signal.c:1095 [inline]
 do_notify_resume+0x364/0x2c84 arch/arm64/kernel/signal.c:1148
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
 el0_svc+0x98/0x128 arch/arm64/kernel/entry-common.c:638
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
irq event stamp: 677
hardirqs last  enabled at (677): [<ffff80000825abd0>] raw_spin_rq_unlock_irq kernel/sched/sched.h:1374 [inline]
hardirqs last  enabled at (677): [<ffff80000825abd0>] finish_lock_switch+0xb0/0x1c8 kernel/sched/core.c:5004
hardirqs last disabled at (676): [<ffff800011c10ed8>] __schedule+0x294/0x1a6c kernel/sched/core.c:6460
softirqs last  enabled at (336): [<ffff80000fe38208>] spin_unlock_bh include/linux/spinlock.h:396 [inline]
softirqs last  enabled at (336): [<ffff80000fe38208>] lock_sock_nested+0xe0/0x130 net/core/sock.c:3512
softirqs last disabled at (334): [<ffff80000fe381b0>] spin_lock_bh include/linux/spinlock.h:356 [inline]
softirqs last disabled at (334): [<ffff80000fe381b0>] lock_sock_nested+0x88/0x130 net/core/sock.c:3508
---[ end trace 0000000000000000 ]---
------------[ cut here ]------------
WARNING: CPU: 1 PID: 13024 at kernel/workqueue.c:1657 __queue_delayed_work kernel/workqueue.c:1657 [inline]
WARNING: CPU: 1 PID: 13024 at kernel/workqueue.c:1657 queue_delayed_work_on+0x28c/0x30c kernel/workqueue.c:1704
Modules linked in:
CPU: 1 PID: 13024 Comm: syz.0.2976 Tainted: G    B   W          syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/02/2026
pstate: 824000c5 (Nzcv daIF +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : __queue_delayed_work kernel/workqueue.c:1657 [inline]
pc : queue_delayed_work_on+0x28c/0x30c kernel/workqueue.c:1704
lr : __queue_delayed_work kernel/workqueue.c:1657 [inline]
lr : queue_delayed_work_on+0x28c/0x30c kernel/workqueue.c:1704
sp : ffff8000259d7840
x29: ffff8000259d7840 x28: 1fffe0001afebc54 x27: 1fffe0001d5bd202
x26: ffff0000d821c390 x25: dfff800000000000 x24: 0000000000000000
x23: 0000000000000000 x22: ffff0000f0341800 x21: 0000000000000000
x20: 0000000000000008 x19: ffff0000d821c330 x18: 1fffe00033e8417e
x17: 203a657079742074 x16: ffff800008043b30 x15: 2065746174732065
x14: ffff60001b043866 x13: 1fffe0001b043866
 x12: 00000000000000fb

x11: ff008000081f9f14
 x10: 0000000000000000 x9 : ffff8000081f9f14
x8 : ffff0000eeed9c00 x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000008 x3 : ffff8000081f9d64
x2 : 0000000000000000 x1 : 0000000000000008 x0 : 0000000000000000
Call trace:
 __queue_delayed_work kernel/workqueue.c:1657 [inline]
 queue_delayed_work_on+0x28c/0x30c kernel/workqueue.c:1704
 queue_delayed_work include/linux/workqueue.h:527 [inline]
 hci_conn_drop+0x194/0x2b4 include/net/bluetooth/hci_core.h:1448
 sco_chan_del net/bluetooth/sco.c:184 [inline]
 __sco_sock_close+0x140/0x800 net/bluetooth/sco.c:492
 sco_sock_close net/bluetooth/sco.c:507 [inline]
 sco_sock_release+0xb0/0x2b8 net/bluetooth/sco.c:1303
 __sock_release net/socket.c:654 [inline]
 sock_close+0xac/0x1ec net/socket.c:1400
 __fput+0x1b4/0x7b0 fs/file_table.c:320
 ____fput+0x20/0x30 fs/file_table.c:348
 task_work_run+0x1f4/0x280 kernel/task_work.c:203
 get_signal+0x1140/0x133c kernel/signal.c:2649
 do_signal arch/arm64/kernel/signal.c:1095 [inline]
 do_notify_resume+0x364/0x2c84 arch/arm64/kernel/signal.c:1148
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
 el0_svc+0x98/0x128 arch/arm64/kernel/entry-common.c:638
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
irq event stamp: 677
hardirqs last  enabled at (677): [<ffff80000825abd0>] raw_spin_rq_unlock_irq kernel/sched/sched.h:1374 [inline]
hardirqs last  enabled at (677): [<ffff80000825abd0>] finish_lock_switch+0xb0/0x1c8 kernel/sched/core.c:5004
hardirqs last disabled at (676): [<ffff800011c10ed8>] __schedule+0x294/0x1a6c kernel/sched/core.c:6460
softirqs last  enabled at (336): [<ffff80000fe38208>] spin_unlock_bh include/linux/spinlock.h:396 [inline]
softirqs last  enabled at (336): [<ffff80000fe38208>] lock_sock_nested+0xe0/0x130 net/core/sock.c:3512
softirqs last disabled at (334): [<ffff80000fe381b0>] spin_lock_bh include/linux/spinlock.h:356 [inline]
softirqs last disabled at (334): [<ffff80000fe381b0>] lock_sock_nested+0x88/0x130 net/core/sock.c:3508
---[ end trace 0000000000000000 ]---
------------[ cut here ]------------
ODEBUG: activate not available (active state 0) object type: work_struct hint: hci_le_remove_cig net/bluetooth/hci_conn.c:-1 [inline]
ODEBUG: activate not available (active state 0) object type: work_struct hint: hci_conn_timeout+0x0/0x41c net/bluetooth/hci_conn.c:980
WARNING: CPU: 1 PID: 13024 at lib/debugobjects.c:518 debug_print_object lib/debugobjects.c:515 [inline]
WARNING: CPU: 1 PID: 13024 at lib/debugobjects.c:518 debug_object_activate+0x36c/0x4c0 lib/debugobjects.c:722
Modules linked in:
CPU: 1 PID: 13024 Comm: syz.0.2976 Tainted: G    B   W          syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/02/2026
pstate: 624000c5 (nZCv daIF +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : debug_print_object lib/debugobjects.c:515 [inline]
pc : debug_object_activate+0x36c/0x4c0 lib/debugobjects.c:722
lr : debug_print_object lib/debugobjects.c:515 [inline]
lr : debug_object_activate+0x36c/0x4c0 lib/debugobjects.c:722
sp : ffff8000259d7730
x29: ffff8000259d7740 x28: dfff800000000000 x27: 0000000000000000
x26: ffff0000d821c330 x25: ffff800015330000 x24: ffff800011c91e40
x23: 0000000000000005 x22: ffff80001218b1e0 x21: ffff800010d086a8
x20: ffff800011c91e40 x19: ffff0000d821c330 x18: 1fffe00033e8417e
x17: 726f77203a657079 x16: ffff800011b3e320 x15: 2029302065746174
x14: 0000000000000001 x13: 1fffe00033e841a3 x12: 0000000000000000
x11: ff00800008195f70 x10: 0000000000000000 x9 : 0dd7a11acb818800
x8 : 0dd7a11acb818800 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff8000259d71b8 x4 : ffff800015414e60 x3 : ffff8000085404d8
x2 : 0000000000000001 x1 : 0000000100000001 x0 : 0000000000000000
Call trace:
 debug_print_object lib/debugobjects.c:515 [inline]
 debug_object_activate+0x36c/0x4c0 lib/debugobjects.c:722
 debug_work_activate kernel/workqueue.c:510 [inline]
 __queue_work+0xcec/0x1280 kernel/workqueue.c:1519
 __queue_delayed_work kernel/workqueue.c:1668 [inline]
 queue_delayed_work_on+0x208/0x30c kernel/workqueue.c:1704
 queue_delayed_work include/linux/workqueue.h:527 [inline]
 hci_conn_drop+0x194/0x2b4 include/net/bluetooth/hci_core.h:1448
 sco_chan_del net/bluetooth/sco.c:184 [inline]
 __sco_sock_close+0x140/0x800 net/bluetooth/sco.c:492
 sco_sock_close net/bluetooth/sco.c:507 [inline]
 sco_sock_release+0xb0/0x2b8 net/bluetooth/sco.c:1303
 __sock_release net/socket.c:654 [inline]
 sock_close+0xac/0x1ec net/socket.c:1400
 __fput+0x1b4/0x7b0 fs/file_table.c:320
 ____fput+0x20/0x30 fs/file_table.c:348
 task_work_run+0x1f4/0x280 kernel/task_work.c:203
 get_signal+0x1140/0x133c kernel/signal.c:2649
 do_signal arch/arm64/kernel/signal.c:1095 [inline]
 do_notify_resume+0x364/0x2c84 arch/arm64/kernel/signal.c:1148
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
 el0_svc+0x98/0x128 arch/arm64/kernel/entry-common.c:638
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
irq event stamp: 677
hardirqs last  enabled at (677): [<ffff80000825abd0>] raw_spin_rq_unlock_irq kernel/sched/sched.h:1374 [inline]
hardirqs last  enabled at (677): [<ffff80000825abd0>] finish_lock_switch+0xb0/0x1c8 kernel/sched/core.c:5004
hardirqs last disabled at (676): [<ffff800011c10ed8>] __schedule+0x294/0x1a6c kernel/sched/core.c:6460
softirqs last  enabled at (336): [<ffff80000fe38208>] spin_unlock_bh include/linux/spinlock.h:396 [inline]
softirqs last  enabled at (336): [<ffff80000fe38208>] lock_sock_nested+0xe0/0x130 net/core/sock.c:3512
softirqs last disabled at (334): [<ffff80000fe381b0>] spin_lock_bh include/linux/spinlock.h:356 [inline]
softirqs last disabled at (334): [<ffff80000fe381b0>] lock_sock_nested+0x88/0x130 net/core/sock.c:3508
---[ end trace 0000000000000000 ]---

Crashes (6):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/06/24 23:18 linux-6.1.y fdb6fcb41cc7 302586aa .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Write in hci_conn_drop
2026/03/29 06:59 linux-6.1.y 1989cd3d56e2 b5ceaad2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KASAN: use-after-free Write in hci_conn_drop
2026/07/15 05:21 linux-6.1.y 090666d3cc90 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Write in hci_conn_drop
2026/07/15 05:09 linux-6.1.y 090666d3cc90 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Write in hci_conn_drop
2026/06/24 19:19 linux-6.1.y fdb6fcb41cc7 302586aa .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Write in hci_conn_drop
2026/03/12 20:44 linux-6.1.y f2ddafa93a25 4efadf07 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 KASAN: use-after-free Write in hci_conn_drop
* Struck through repros no longer work on HEAD.