syzbot

==================================================================
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:1419
Write of size 4 at addr ffff0000d33da010 by task syz.5.540/8285

CPU: 1 PID: 8285 Comm: syz.5.540 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/26/2026
Call trace:
 dump_backtrace+0x1c0/0x1ec 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:1419
 sco_chan_del net/bluetooth/sco.c:184 [inline]
 __sco_sock_close+0x140/0x750 net/bluetooth/sco.c:475
 sco_sock_close net/bluetooth/sco.c:490 [inline]
 sco_sock_release+0xb4/0x2bc net/bluetooth/sco.c:1276
 __sock_release net/socket.c:654 [inline]
 sock_close+0xb4/0x1f8 net/socket.c:1399
 __fput+0x1bc/0x7b8 fs/file_table.c:320
 ____fput+0x20/0x30 fs/file_table.c:348
 task_work_run+0x1ec/0x278 kernel/task_work.c:203
 get_signal+0x111c/0x1304 kernel/signal.c:2648
 do_signal arch/arm64/kernel/signal.c:1095 [inline]
 do_notify_resume+0x33c/0x2aa4 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 8285:
 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+0xc4/0x106c net/bluetooth/hci_conn.c:990
 hci_connect_sco+0x94/0x368 net/bluetooth/hci_conn.c:1630
 sco_connect net/bluetooth/sco.c:280 [inline]
 sco_sock_connect+0x22c/0x7a4 net/bluetooth/sco.c:623
 __sys_connect_file net/socket.c:2010 [inline]
 __sys_connect+0x28c/0x2b4 net/socket.c:2027
 __do_sys_connect net/socket.c:2037 [inline]
 __se_sys_connect net/socket.c:2034 [inline]
 __arm64_sys_connect+0x7c/0x94 net/socket.c:2034
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x130 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 8271:
 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/0x218 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+0x8c/0x1ac 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+0x2a8/0x420 lib/kobject.c:729
 put_device+0x28/0x40 drivers/base/core.c:3805
 hci_conn_del_sysfs+0x78/0x14c net/bluetooth/hci_sysfs.c:60
 hci_conn_cleanup+0x4e0/0x68c net/bluetooth/hci_conn.c:172
 hci_conn_del+0x3cc/0x5a4 net/bluetooth/hci_conn.c:1152
 hci_conn_del+0x2cc/0x5a4 net/bluetooth/hci_conn.c:1111
 hci_conn_failed+0x1e0/0x280 net/bluetooth/hci_conn.c:1249
 hci_abort_conn_sync+0x8f8/0xb58 net/bluetooth/hci_sync.c:5577
 hci_disconnect_all_sync net/bluetooth/hci_sync.c:5590 [inline]
 hci_suspend_sync+0x4bc/0xd80 net/bluetooth/hci_sync.c:6072
 hci_suspend_dev+0x14c/0x2d0 net/bluetooth/hci_core.c:2831
 hci_suspend_notifier+0xe4/0x274 net/bluetooth/hci_core.c:2406
 notifier_call_chain kernel/notifier.c:87 [inline]
 notifier_call_chain_robust+0xdc/0x280 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+0x30c/0x384 drivers/char/misc.c:145
 chrdev_open+0x3d4/0x518 fs/char_dev.c:414
 do_dentry_open+0x72c/0xf98 fs/open.c:882
 vfs_open+0x7c/0x90 fs/open.c:1015
 do_open fs/namei.c:3634 [inline]
 path_openat+0x1f8c/0x26bc fs/namei.c:3791
 do_filp_open+0x194/0x384 fs/namei.c:3818
 do_sys_openat2+0x134/0x3f4 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+0x118/0x14c fs/open.c:1347
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x130 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

The buggy address belongs to the object at ffff0000d33da000
 which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 16 bytes inside of
 4096-byte region [ffff0000d33da000, ffff0000d33db000)

The buggy address belongs to the physical page:
page:000000000e358fc1 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1133d8
head:000000000e358fc1 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000010200 fffffc000367d800 dead000000000002 ffff0000c0002a80
raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000d33d9f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000d33d9f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff0000d33da000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                         ^
 ffff0000d33da080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000d33da100: 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+0x0/0x418 net/bluetooth/hci_conn.c:980
WARNING: CPU: 1 PID: 8285 at lib/debugobjects.c:518 debug_print_object+0x148/0x1d4 lib/debugobjects.c:515
Modules linked in:
CPU: 1 PID: 8285 Comm: syz.5.540 Tainted: G    B              syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/26/2026
pstate: 624000c5 (nZCv daIF +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : debug_print_object+0x148/0x1d4 lib/debugobjects.c:515
lr : debug_print_object+0x148/0x1d4 lib/debugobjects.c:515
sp : ffff800020ea75f0
x29: ffff800020ea75f0 x28: ffff0001019c22f0 x27: 0000000000000003
x26: ffff800015210000 x25: ffff8000083b6464 x24: dfff800000000000
x23: 0000000000000000 x22: ffff800010c0ddcc x21: ffff80001207c360
x20: ffff800011bab020 x19: ffff80001207bea0 x18: ffff800011b8bf60
x17: 203a657079742074 x16: ffff8000082eee68 x15: 0000000000000002
x14: 0000000000000001 x13: 1ffff000041d4e0c x12: 0000000000080000
x11: 000000000003b8d0 x10: ffff8000337ee000 x9 : d9586ea5ff115d00
x8 : d9586ea5ff115d00 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff800020ea7078 x4 : ffff8000152f4cc0 x3 : ffff800008319560
x2 : 0000000000000001 x1 : 0000000100000000 x0 : 0000000000000000
Call trace:
 debug_print_object+0x148/0x1d4 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+0x4c/0x218 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+0xa4/0x654 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:1444
 sco_chan_del net/bluetooth/sco.c:184 [inline]
 __sco_sock_close+0x140/0x750 net/bluetooth/sco.c:475
 sco_sock_close net/bluetooth/sco.c:490 [inline]
 sco_sock_release+0xb4/0x2bc net/bluetooth/sco.c:1276
 __sock_release net/socket.c:654 [inline]
 sock_close+0xb4/0x1f8 net/socket.c:1399
 __fput+0x1bc/0x7b8 fs/file_table.c:320
 ____fput+0x20/0x30 fs/file_table.c:348
 task_work_run+0x1ec/0x278 kernel/task_work.c:203
 get_signal+0x111c/0x1304 kernel/signal.c:2648
 do_signal arch/arm64/kernel/signal.c:1095 [inline]
 do_notify_resume+0x33c/0x2aa4 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: 4029
hardirqs last  enabled at (4029): [<ffff800008257a00>] raw_spin_rq_unlock_irq kernel/sched/sched.h:1374 [inline]
hardirqs last  enabled at (4029): [<ffff800008257a00>] finish_lock_switch+0xb0/0x1c4 kernel/sched/core.c:5004
hardirqs last disabled at (4028): [<ffff800011aff0e4>] __schedule+0x298/0x1b0c kernel/sched/core.c:6460
softirqs last  enabled at (3848): [<ffff80000fd621c4>] spin_unlock_bh include/linux/spinlock.h:396 [inline]
softirqs last  enabled at (3848): [<ffff80000fd621c4>] lock_sock_nested+0xe0/0x130 net/core/sock.c:3503
softirqs last disabled at (3846): [<ffff80000fd6216c>] spin_lock_bh include/linux/spinlock.h:356 [inline]
softirqs last disabled at (3846): [<ffff80000fd6216c>] lock_sock_nested+0x88/0x130 net/core/sock.c:3499
---[ end trace 0000000000000000 ]---
------------[ cut here ]------------
WARNING: CPU: 1 PID: 8285 at kernel/workqueue.c:1657 __queue_delayed_work kernel/workqueue.c:1657 [inline]
WARNING: CPU: 1 PID: 8285 at kernel/workqueue.c:1657 queue_delayed_work_on+0x288/0x30c kernel/workqueue.c:1704
Modules linked in:
CPU: 1 PID: 8285 Comm: syz.5.540 Tainted: G    B   W          syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/26/2026
pstate: 824000c5 (Nzcv daIF +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : __queue_delayed_work kernel/workqueue.c:1657 [inline]
pc : queue_delayed_work_on+0x288/0x30c kernel/workqueue.c:1704
lr : __queue_delayed_work kernel/workqueue.c:1657 [inline]
lr : queue_delayed_work_on+0x288/0x30c kernel/workqueue.c:1704
sp : ffff800020ea77d0
x29: ffff800020ea77d0 x28: ffff0001019c22f0 x27: 1fffe0001dd62635
x26: dfff800000000000 x25: 0000000000000000 x24: ffff0000d33da390
x23: ffff0000d2b92800 x22: 0000000000000000 x21: 0000000000000000
x20: 0000000000000008 x19: ffff0000d33da330 x18: ffff800011b8bf60
x17: 203a657079742074 x16: ffff80000804309c x15: 0000000000000002
x14: ffff60001a67b466 x13: 1fffe0001a67b466 x12: 0000000000080000
x11: 0000000000059b1c x10: ffff8000337ee000 x9 : ffff8000081f7a30
x8 : 0000000000059b1d x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000008 x3 : ffff8000081f7884
x2 : 0000000000000000 x1 : 0000000000000008 x0 : 0000000000000000
Call trace:
 __queue_delayed_work kernel/workqueue.c:1657 [inline]
 queue_delayed_work_on+0x288/0x30c kernel/workqueue.c:1704
 queue_delayed_work include/linux/workqueue.h:527 [inline]
 hci_conn_drop+0x194/0x2b4 include/net/bluetooth/hci_core.h:1445
 sco_chan_del net/bluetooth/sco.c:184 [inline]
 __sco_sock_close+0x140/0x750 net/bluetooth/sco.c:475
 sco_sock_close net/bluetooth/sco.c:490 [inline]
 sco_sock_release+0xb4/0x2bc net/bluetooth/sco.c:1276
 __sock_release net/socket.c:654 [inline]
 sock_close+0xb4/0x1f8 net/socket.c:1399
 __fput+0x1bc/0x7b8 fs/file_table.c:320
 ____fput+0x20/0x30 fs/file_table.c:348
 task_work_run+0x1ec/0x278 kernel/task_work.c:203
 get_signal+0x111c/0x1304 kernel/signal.c:2648
 do_signal arch/arm64/kernel/signal.c:1095 [inline]
 do_notify_resume+0x33c/0x2aa4 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: 4029
hardirqs last  enabled at (4029): [<ffff800008257a00>] raw_spin_rq_unlock_irq kernel/sched/sched.h:1374 [inline]
hardirqs last  enabled at (4029): [<ffff800008257a00>] finish_lock_switch+0xb0/0x1c4 kernel/sched/core.c:5004
hardirqs last disabled at (4028): [<ffff800011aff0e4>] __schedule+0x298/0x1b0c kernel/sched/core.c:6460
softirqs last  enabled at (3848): [<ffff80000fd621c4>] spin_unlock_bh include/linux/spinlock.h:396 [inline]
softirqs last  enabled at (3848): [<ffff80000fd621c4>] lock_sock_nested+0xe0/0x130 net/core/sock.c:3503
softirqs last disabled at (3846): [<ffff80000fd6216c>] spin_lock_bh include/linux/spinlock.h:356 [inline]
softirqs last disabled at (3846): [<ffff80000fd6216c>] lock_sock_nested+0x88/0x130 net/core/sock.c:3499
---[ 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+0x0/0x418 net/bluetooth/hci_conn.c:980
WARNING: CPU: 1 PID: 8285 at lib/debugobjects.c:518 debug_print_object lib/debugobjects.c:515 [inline]
WARNING: CPU: 1 PID: 8285 at lib/debugobjects.c:518 debug_object_activate+0x368/0x4b8 lib/debugobjects.c:722
Modules linked in:
CPU: 1 PID: 8285 Comm: syz.5.540 Tainted: G    B   W          syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/26/2026
pstate: 624000c5 (nZCv daIF +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : debug_print_object lib/debugobjects.c:515 [inline]
pc : debug_object_activate+0x368/0x4b8 lib/debugobjects.c:722
lr : debug_print_object lib/debugobjects.c:515 [inline]
lr : debug_object_activate+0x368/0x4b8 lib/debugobjects.c:722
sp : ffff800020ea76c0
x29: ffff800020ea76d0 x28: dfff800000000000 x27: 0000000000000000
x26: ffff0000d33da330 x25: ffff800015210000 x24: ffff800011b81c40
x23: 0000000000000005 x22: ffff80001207c360 x21: ffff800010c0ddcc
x20: ffff800011b81c40 x19: ffff0000d33da330 x18: ffff800011b8bf60
x17: 726f77203a657079 x16: ffff8000082eee68 x15: 0000000000000002
x14: 0000000000000001 x13: 1fffe00033eac9a3 x12: 0000000000080000
x11: 000000000006f4fc x10: ffff8000337ee000 x9 : d9586ea5ff115d00
x8 : d9586ea5ff115d00 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff800020ea7158 x4 : ffff8000152f4cc0 x3 : ffff80000853854c
x2 : 0000000000000001 x1 : 0000000100000001 x0 : 0000000000000000
Call trace:
 debug_print_object lib/debugobjects.c:515 [inline]
 debug_object_activate+0x368/0x4b8 lib/debugobjects.c:722
 debug_work_activate kernel/workqueue.c:510 [inline]
 __queue_work+0xca8/0x1234 kernel/workqueue.c:1519
 __queue_delayed_work kernel/workqueue.c:1668 [inline]
 queue_delayed_work_on+0x204/0x30c kernel/workqueue.c:1704
 queue_delayed_work include/linux/workqueue.h:527 [inline]
 hci_conn_drop+0x194/0x2b4 include/net/bluetooth/hci_core.h:1445
 sco_chan_del net/bluetooth/sco.c:184 [inline]
 __sco_sock_close+0x140/0x750 net/bluetooth/sco.c:475
 sco_sock_close net/bluetooth/sco.c:490 [inline]
 sco_sock_release+0xb4/0x2bc net/bluetooth/sco.c:1276
 __sock_release net/socket.c:654 [inline]
 sock_close+0xb4/0x1f8 net/socket.c:1399
 __fput+0x1bc/0x7b8 fs/file_table.c:320
 ____fput+0x20/0x30 fs/file_table.c:348
 task_work_run+0x1ec/0x278 kernel/task_work.c:203
 get_signal+0x111c/0x1304 kernel/signal.c:2648
 do_signal arch/arm64/kernel/signal.c:1095 [inline]
 do_notify_resume+0x33c/0x2aa4 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: 4029
hardirqs last  enabled at (4029): [<ffff800008257a00>] raw_spin_rq_unlock_irq kernel/sched/sched.h:1374 [inline]
hardirqs last  enabled at (4029): [<ffff800008257a00>] finish_lock_switch+0xb0/0x1c4 kernel/sched/core.c:5004
hardirqs last disabled at (4028): [<ffff800011aff0e4>] __schedule+0x298/0x1b0c kernel/sched/core.c:6460
softirqs last  enabled at (3848): [<ffff80000fd621c4>] spin_unlock_bh include/linux/spinlock.h:396 [inline]
softirqs last  enabled at (3848): [<ffff80000fd621c4>] lock_sock_nested+0xe0/0x130 net/core/sock.c:3503
softirqs last disabled at (3846): [<ffff80000fd6216c>] spin_lock_bh include/linux/spinlock.h:356 [inline]
softirqs last disabled at (3846): [<ffff80000fd6216c>] lock_sock_nested+0x88/0x130 net/core/sock.c:3499
---[ end trace 0000000000000000 ]---