KASAN: slab-use-after-free Read in hci_cmd_work
Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
==================================================================
BUG: KASAN: slab-use-after-free in hci_cmd_work+0x5d0/0x7b0 net/bluetooth/hci_core.c:4174
Read of size 2 at addr ffff8880288b9cb8 by task kworker/u9:0/52
CPU: 1 UID: 0 PID: 52 Comm: kworker/u9:0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: hci0 hci_cmd_work
Call Trace:
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
hci_cmd_work+0x5d0/0x7b0 net/bluetooth/hci_core.c:4174
process_one_work+0x93a/0x15e0 kernel/workqueue.c:3261
process_scheduled_works kernel/workqueue.c:3344 [inline]
worker_thread+0x9b0/0xee0 kernel/workqueue.c:3425
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
Allocated by task 5150:
kasan_save_stack mm/kasan/common.c:56 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
unpoison_slab_object mm/kasan/common.c:339 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:365
kasan_slab_alloc include/linux/kasan.h:252 [inline]
slab_post_alloc_hook mm/slub.c:4948 [inline]
slab_alloc_node mm/slub.c:5258 [inline]
kmem_cache_alloc_node_noprof+0x43c/0x710 mm/slub.c:5310
__alloc_skb+0x112/0x2d0 net/core/skbuff.c:664
alloc_skb include/linux/skbuff.h:1383 [inline]
bt_skb_alloc include/net/bluetooth/bluetooth.h:510 [inline]
hci_cmd_sync_alloc+0x3d/0x3b0 net/bluetooth/hci_sync.c:58
hci_cmd_sync_add net/bluetooth/hci_sync.c:99 [inline]
__hci_cmd_sync_sk+0x1a7/0xc70 net/bluetooth/hci_sync.c:168
__hci_cmd_sync_status_sk net/bluetooth/hci_sync.c:263 [inline]
__hci_cmd_sync_status net/bluetooth/hci_sync.c:287 [inline]
hci_read_bd_addr_sync net/bluetooth/hci_sync.c:3641 [inline]
hci_init_stage_sync net/bluetooth/hci_sync.c:3623 [inline]
hci_init1_sync net/bluetooth/hci_sync.c:3755 [inline]
hci_init_sync net/bluetooth/hci_sync.c:4874 [inline]
hci_dev_init_sync net/bluetooth/hci_sync.c:5066 [inline]
hci_dev_open_sync+0x1756/0x2dc0 net/bluetooth/hci_sync.c:5144
hci_dev_do_open net/bluetooth/hci_core.c:430 [inline]
hci_power_on+0x1b4/0x720 net/bluetooth/hci_core.c:959
process_one_work+0x93a/0x15e0 kernel/workqueue.c:3261
process_scheduled_works kernel/workqueue.c:3344 [inline]
worker_thread+0x9b0/0xee0 kernel/workqueue.c:3425
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
Freed by task 5904:
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:584
poison_slab_object mm/kasan/common.c:252 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284
kasan_slab_free include/linux/kasan.h:234 [inline]
slab_free_hook mm/slub.c:2540 [inline]
slab_free mm/slub.c:6663 [inline]
kmem_cache_free+0x197/0x640 mm/slub.c:6774
kfree_skb_reason include/linux/skbuff.h:1322 [inline]
kfree_skb include/linux/skbuff.h:1331 [inline]
vhci_read+0x49a/0x5b0 drivers/bluetooth/hci_vhci.c:593
vfs_read+0x200/0xa30 fs/read_write.c:570
ksys_read+0x145/0x250 fs/read_write.c:715
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
The buggy address belongs to the object at ffff8880288b9c80
which belongs to the cache skbuff_head_cache of size 240
The buggy address is located 56 bytes inside of
freed 240-byte region [ffff8880288b9c80, ffff8880288b9d70)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x288b9
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff888140aaf8c0 dead000000000122 0000000000000000
raw: 0000000000000000 00000000000c000c 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 52, tgid 52 (kworker/u9:0), ts 99724528794, free_ts 99690250046
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851
prep_new_page mm/page_alloc.c:1859 [inline]
get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3920
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5215
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2486
alloc_slab_page mm/slub.c:3075 [inline]
allocate_slab+0x86/0x3b0 mm/slub.c:3248
new_slab mm/slub.c:3302 [inline]
___slab_alloc+0xf56/0x1990 mm/slub.c:4651
__slab_alloc+0x65/0x100 mm/slub.c:4774
__slab_alloc_node mm/slub.c:4850 [inline]
slab_alloc_node mm/slub.c:5246 [inline]
kmem_cache_alloc_noprof+0x40f/0x700 mm/slub.c:5265
skb_clone+0x212/0x3a0 net/core/skbuff.c:2069
hci_event_packet+0x1a6/0x1260 net/bluetooth/hci_event.c:7667
hci_rx_work+0x45d/0xfc0 net/bluetooth/hci_core.c:4099
process_one_work+0x93a/0x15e0 kernel/workqueue.c:3261
process_scheduled_works kernel/workqueue.c:3344 [inline]
worker_thread+0x9b0/0xee0 kernel/workqueue.c:3425
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
page last free pid 23 tgid 23 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1395 [inline]
__free_frozen_pages+0xbc8/0xd30 mm/page_alloc.c:2948
__tlb_remove_table_free mm/mmu_gather.c:227 [inline]
tlb_remove_table_rcu+0x85/0x100 mm/mmu_gather.c:290
rcu_do_batch kernel/rcu/tree.c:2605 [inline]
rcu_core+0xcab/0x1770 kernel/rcu/tree.c:2861
handle_softirqs+0x27d/0x880 kernel/softirq.c:626
run_ksoftirqd+0x9b/0x100 kernel/softirq.c:1067
smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
Memory state around the buggy address:
ffff8880288b9b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff8880288b9c00: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
>ffff8880288b9c80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880288b9d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
ffff8880288b9d80: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
==================================================================
Warning: Permanently added '10.128.1.123' (ED25519) to the list of known hosts.
2025/11/18 08:35:15 parsed 1 programs
[ 91.145581][ T5833] cgroup: Unknown subsys name 'net'
[ 91.283151][ T5833] cgroup: Unknown subsys name 'cpuset'
[ 91.292018][ T5833] cgroup: Unknown subsys name 'rlimit'
[ 92.201794][ T892] cfg80211: failed to load regulatory.db
[ 93.100927][ T5833] Adding 124996k swap on ./swap-file. Priority:0 extents:1 across:124996k
[ 96.441514][ T5849] soft_limit_in_bytes is deprecated and will be removed. Please report your usecase to linux-mm@kvack.org if you depend on this functionality.
[ 97.585449][ T5866] chnl_net:caif_netlink_parms(): no params data found
[ 97.666928][ T5866] bridge0: port 1(bridge_slave_0) entered blocking state
[ 97.675027][ T5866] bridge0: port 1(bridge_slave_0) entered disabled state
[ 97.682372][ T5866] bridge_slave_0: entered allmulticast mode
[ 97.689862][ T5866] bridge_slave_0: entered promiscuous mode
[ 97.698836][ T5866] bridge0: port 2(bridge_slave_1) entered blocking state
[ 97.706275][ T5866] bridge0: port 2(bridge_slave_1) entered disabled state
[ 97.713778][ T5866] bridge_slave_1: entered allmulticast mode
[ 97.721629][ T5866] bridge_slave_1: entered promiscuous mode
[ 97.755428][ T5866] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link
[ 97.767334][ T5866] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link
[ 97.800801][ T5866] team0: Port device team_slave_0 added
[ 97.808881][ T5866] team0: Port device team_slave_1 added
[ 97.839760][ T5866] batman_adv: batadv0: Adding interface: batadv_slave_0
[ 97.846947][ T5866] batman_adv: batadv0: The MTU of interface batadv_slave_0 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1532 would solve the problem.
[ 97.874813][ T5866] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active
[ 97.887794][ T5866] batman_adv: batadv0: Adding interface: batadv_slave_1
[ 97.895439][ T5866] batman_adv: batadv0: The MTU of interface batadv_slave_1 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1532 would solve the problem.
[ 97.921401][ T5866] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active
[ 97.968129][ T5866] hsr_slave_0: entered promiscuous mode
[ 97.975349][ T5866] hsr_slave_1: entered promiscuous mode
[ 98.127212][ T5866] netdevsim netdevsim0 netdevsim0: renamed from eth0
[ 98.139709][ T5866] netdevsim netdevsim0 netdevsim1: renamed from eth1
[ 98.150835][ T5866] netdevsim netdevsim0 netdevsim2: renamed from eth2
[ 98.162795][ T5866] netdevsim netdevsim0 netdevsim3: renamed from eth3
[ 98.198683][ T5866] bridge0: port 2(bridge_slave_1) entered blocking state
[ 98.205926][ T5866] bridge0: port 2(bridge_slave_1) entered forwarding state
[ 98.213911][ T5866] bridge0: port 1(bridge_slave_0) entered blocking state
[ 98.221060][ T5866] bridge0: port 1(bridge_slave_0) entered forwarding state
[ 98.284624][ T5866] 8021q: adding VLAN 0 to HW filter on device bond0
[ 98.303301][ T65] bridge0: port 1(bridge_slave_0) entered disabled state
[ 98.311959][ T65] bridge0: port 2(bridge_slave_1) entered disabled state
[ 98.329235][ T5866] 8021q: adding VLAN 0 to HW filter on device team0
[ 98.344323][ T74] bridge0: port 1(bridge_slave_0) entered blocking state
[ 98.351585][ T74] bridge0: port 1(bridge_slave_0) entered forwarding state
[ 98.367037][ T65] bridge0: port 2(bridge_slave_1) entered blocking state
[ 98.374297][ T65] bridge0: port 2(bridge_slave_1) entered forwarding state
[ 98.570780][ T5866] 8021q: adding VLAN 0 to HW filter on device batadv0
[ 98.625460][ T5866] veth0_vlan: entered promiscuous mode
[ 98.638116][ T5866] veth1_vlan: entered promiscuous mode
[ 98.671117][ T5866] veth0_macvtap: entered promiscuous mode
[ 98.685411][ T5866] veth1_macvtap: entered promiscuous mode
[ 98.704489][ T5866] batman_adv: batadv0: Interface activated: batadv_slave_0
[ 98.722164][ T5866] batman_adv: batadv0: Interface activated: batadv_slave_1
[ 98.738606][ T74] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
[ 98.750526][ T74] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
[ 98.762571][ T74] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
[ 98.771946][ T74] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0
[ 98.916240][ T74] netdevsim netdevsim0 netdevsim3 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[ 98.994336][ T74] netdevsim netdevsim0 netdevsim2 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[ 99.055847][ T74] netdevsim netdevsim0 netdevsim1 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[ 99.164735][ T74] netdevsim netdevsim0 netdevsim0 (unregistering): unset [1, 0] type 2 family 0 port 6081 - 0
[ 99.266709][ T12] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[ 99.280505][ T12] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50
[ 99.310033][ T4471] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
[ 99.318432][ T4471] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
[ 99.711457][ T52] Bluetooth: hci0: unexpected cc 0x0c03 length: 249 > 1
[ 99.724619][ T52] Bluetooth: hci0: unexpected cc 0x1003 length: 249 > 9
[ 99.733210][ T52] Bluetooth: hci0: unexpected cc 0x1001 length: 249 > 9
[ 99.742505][ T52] ==================================================================
[ 99.750696][ T52] BUG: KASAN: slab-use-after-free in hci_cmd_work+0x5d0/0x7b0
[ 99.758297][ T52] Read of size 2 at addr ffff8880288b9cb8 by task kworker/u9:0/52
[ 99.766129][ T52]
[ 99.768568][ T52] CPU: 1 UID: 0 PID: 52 Comm: kworker/u9:0 Not tainted syzkaller #0 PREEMPT(full)
[ 99.768593][ T52] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
[ 99.768607][ T52] Workqueue: hci0 hci_cmd_work
[ 99.768632][ T52] Call Trace:
[ 99.768641][ T52]
[ 99.768649][ T52] dump_stack_lvl+0x189/0x250
[ 99.768675][ T52] ? __virt_addr_valid+0x1c8/0x5c0
[ 99.768701][ T52] ? rcu_is_watching+0x15/0xb0
[ 99.768726][ T52] ? __pfx_dump_stack_lvl+0x10/0x10
[ 99.768749][ T52] ? rcu_is_watching+0x15/0xb0
[ 99.768773][ T52] ? lock_release+0x4b/0x3d0
[ 99.768793][ T52] ? _raw_spin_lock_irqsave+0xb3/0xf0
[ 99.768820][ T52] ? __virt_addr_valid+0x1c8/0x5c0
[ 99.768846][ T52] ? __virt_addr_valid+0x4a5/0x5c0
[ 99.768874][ T52] print_report+0xca/0x240
[ 99.768899][ T52] ? hci_cmd_work+0x5d0/0x7b0
[ 99.768916][ T52] kasan_report+0x118/0x150
[ 99.768939][ T52] ? hci_cmd_work+0x5d0/0x7b0
[ 99.768960][ T52] hci_cmd_work+0x5d0/0x7b0
[ 99.768979][ T52] ? process_one_work+0x868/0x15e0
[ 99.768999][ T52] process_one_work+0x93a/0x15e0
[ 99.769019][ T52] ? __lock_acquire+0xab9/0xd20
[ 99.769048][ T52] ? __pfx_process_one_work+0x10/0x10
[ 99.769072][ T52] ? assign_work+0x3a1/0x410
[ 99.769094][ T52] worker_thread+0x9b0/0xee0
[ 99.769134][ T52] kthread+0x711/0x8a0
[ 99.769160][ T52] ? __pfx_worker_thread+0x10/0x10
[ 99.769179][ T52] ? __pfx_kthread+0x10/0x10
[ 99.769202][ T52] ? _raw_spin_unlock_irq+0x23/0x50
[ 99.769226][ T52] ? lockdep_hardirqs_on+0x9c/0x150
[ 99.769252][ T52] ? __pfx_kthread+0x10/0x10
[ 99.769277][ T52] ret_from_fork+0x599/0xb30
[ 99.769298][ T52] ? __pfx_ret_from_fork+0x10/0x10
[ 99.769323][ T52] ? __switch_to_asm+0x39/0x70
[ 99.769349][ T52] ? __switch_to_asm+0x33/0x70
[ 99.769373][ T52] ? __pfx_kthread+0x10/0x10
[ 99.769398][ T52] ret_from_fork_asm+0x1a/0x30
[ 99.769432][ T52]
[ 99.769439][ T52]
[ 99.961246][ T52] Allocated by task 5150:
[ 99.965576][ T52] kasan_save_track+0x3e/0x80
[ 99.970716][ T52] __kasan_slab_alloc+0x6c/0x80
[ 99.975586][ T52] kmem_cache_alloc_node_noprof+0x43c/0x710
[ 99.981513][ T52] __alloc_skb+0x112/0x2d0
[ 99.985955][ T52] hci_cmd_sync_alloc+0x3d/0x3b0
[ 99.990915][ T52] __hci_cmd_sync_sk+0x1a7/0xc70
[ 99.995872][ T52] hci_dev_open_sync+0x1756/0x2dc0
[ 100.000997][ T52] hci_power_on+0x1b4/0x720
[ 100.005508][ T52] process_one_work+0x93a/0x15e0
[ 100.010549][ T52] worker_thread+0x9b0/0xee0
[ 100.015180][ T52] kthread+0x711/0x8a0
[ 100.019267][ T52] ret_from_fork+0x599/0xb30
[ 100.023863][ T52] ret_from_fork_asm+0x1a/0x30
[ 100.028823][ T52]
[ 100.031149][ T52] Freed by task 5904:
[ 100.035251][ T52] kasan_save_track+0x3e/0x80
[ 100.039928][ T52] kasan_save_free_info+0x46/0x50
[ 100.044987][ T52] __kasan_slab_free+0x5c/0x80
[ 100.050018][ T52] kmem_cache_free+0x197/0x640
[ 100.054796][ T52] vhci_read+0x49a/0x5b0
[ 100.059198][ T52] vfs_read+0x200/0xa30
[ 100.063358][ T52] ksys_read+0x145/0x250
[ 100.067603][ T52] do_syscall_64+0xfa/0xfa0
[ 100.072134][ T52] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 100.078129][ T52]
[ 100.080591][ T52] The buggy address belongs to the object at ffff8880288b9c80
[ 100.080591][ T52] which belongs to the cache skbuff_head_cache of size 240
[ 100.095365][ T52] The buggy address is located 56 bytes inside of
[ 100.095365][ T52] freed 240-byte region [ffff8880288b9c80, ffff8880288b9d70)
[ 100.109360][ T52]
[ 100.111709][ T52] The buggy address belongs to the physical page:
[ 100.118228][ T52] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x288b9
[ 100.127091][ T52] flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
[ 100.134204][ T52] page_type: f5(slab)
[ 100.138275][ T52] raw: 00fff00000000000 ffff888140aaf8c0 dead000000000122 0000000000000000
[ 100.147133][ T52] raw: 0000000000000000 00000000000c000c 00000000f5000000 0000000000000000
[ 100.155905][ T52] page dumped because: kasan: bad access detected
[ 100.162333][ T52] page_owner tracks the page as allocated
[ 100.168062][ T52] page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 52, tgid 52 (kworker/u9:0), ts 99724528794, free_ts 99690250046
[ 100.187007][ T52] post_alloc_hook+0x240/0x2a0
[ 100.191884][ T52] get_page_from_freelist+0x2365/0x2440
[ 100.197520][ T52] __alloc_frozen_pages_noprof+0x181/0x370
[ 100.203329][ T52] alloc_pages_mpol+0x232/0x4a0
[ 100.208182][ T52] allocate_slab+0x86/0x3b0
[ 100.212867][ T52] ___slab_alloc+0xf56/0x1990
[ 100.217554][ T52] __slab_alloc+0x65/0x100
[ 100.221974][ T52] kmem_cache_alloc_noprof+0x40f/0x700
[ 100.227438][ T52] skb_clone+0x212/0x3a0
[ 100.231696][ T52] hci_event_packet+0x1a6/0x1260
[ 100.236632][ T52] hci_rx_work+0x45d/0xfc0
[ 100.241138][ T52] process_one_work+0x93a/0x15e0
[ 100.246078][ T52] worker_thread+0x9b0/0xee0
[ 100.250671][ T52] kthread+0x711/0x8a0
[ 100.254748][ T52] ret_from_fork+0x599/0xb30
[ 100.259342][ T52] ret_from_fork_asm+0x1a/0x30
[ 100.264229][ T52] page last free pid 23 tgid 23 stack trace:
[ 100.270201][ T52] __free_frozen_pages+0xbc8/0xd30
[ 100.275397][ T52] tlb_remove_table_rcu+0x85/0x100
[ 100.280508][ T52] rcu_core+0xcab/0x1770
[ 100.284749][ T52] handle_softirqs+0x27d/0x880
[ 100.289512][ T52] run_ksoftirqd+0x9b/0x100
[ 100.294101][ T52] smpboot_thread_fn+0x542/0xa60
[ 100.299067][ T52] kthread+0x711/0x8a0
[ 100.303142][ T52] ret_from_fork+0x599/0xb30
[ 100.307755][ T52] ret_from_fork_asm+0x1a/0x30
[ 100.312694][ T52]
[ 100.315013][ T52] Memory state around the buggy address:
[ 100.320732][ T52] ffff8880288b9b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 100.329052][ T52] ffff8880288b9c00: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
[ 100.337110][ T52] >ffff8880288b9c80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 100.345251][ T52] ^
[ 100.351142][ T52] ffff8880288b9d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
[ 100.359307][ T52] ffff8880288b9d80: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
[ 100.367368][ T52] ==================================================================
[ 100.382446][ T52] Kernel panic - not syncing: KASAN: panic_on_warn set ...
[ 100.389788][ T52] CPU: 1 UID: 0 PID: 52 Comm: kworker/u9:0 Not tainted syzkaller #0 PREEMPT(full)
[ 100.399190][ T52] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
[ 100.409369][ T52] Workqueue: hci0 hci_cmd_work
[ 100.414169][ T52] Call Trace:
[ 100.417469][ T52]
[ 100.420419][ T52] dump_stack_lvl+0x99/0x250
[ 100.425102][ T52] ? __asan_memcpy+0x40/0x70
[ 100.429715][ T52] ? __pfx_dump_stack_lvl+0x10/0x10
[ 100.434929][ T52] ? __pfx__printk+0x10/0x10
[ 100.439541][ T52] vpanic+0x237/0x6d0
[ 100.443540][ T52] ? __pfx_vpanic+0x10/0x10
[ 100.448139][ T52] ? preempt_schedule+0xae/0xc0
[ 100.453117][ T52] ? __pfx_preempt_schedule+0x10/0x10
[ 100.458610][ T52] panic+0xb9/0xc0
[ 100.462433][ T52] ? __pfx_panic+0x10/0x10
[ 100.466862][ T52] ? _raw_spin_unlock_irqrestore+0xfd/0x110
[ 100.472785][ T52] ? is_module_address+0x17/0xf0
[ 100.477825][ T52] ? hci_cmd_work+0x5d0/0x7b0
[ 100.482603][ T52] check_panic_on_warn+0x89/0xb0
[ 100.487552][ T52] ? hci_cmd_work+0x5d0/0x7b0
[ 100.492239][ T52] end_report+0x6f/0x160
[ 100.496575][ T52] kasan_report+0x129/0x150
[ 100.501081][ T52] ? hci_cmd_work+0x5d0/0x7b0
[ 100.505766][ T52] hci_cmd_work+0x5d0/0x7b0
[ 100.510354][ T52] ? process_one_work+0x868/0x15e0
[ 100.515463][ T52] process_one_work+0x93a/0x15e0
[ 100.520401][ T52] ? __lock_acquire+0xab9/0xd20
[ 100.525282][ T52] ? __pfx_process_one_work+0x10/0x10
[ 100.530659][ T52] ? assign_work+0x3a1/0x410
[ 100.535250][ T52] worker_thread+0x9b0/0xee0
[ 100.539861][ T52] kthread+0x711/0x8a0
[ 100.544070][ T52] ? __pfx_worker_thread+0x10/0x10
[ 100.549270][ T52] ? __pfx_kthread+0x10/0x10
[ 100.553877][ T52] ? _raw_spin_unlock_irq+0x23/0x50
[ 100.559078][ T52] ? lockdep_hardirqs_on+0x9c/0x150
[ 100.564286][ T52] ? __pfx_kthread+0x10/0x10
[ 100.568972][ T52] ret_from_fork+0x599/0xb30
[ 100.573747][ T52] ? __pfx_ret_from_fork+0x10/0x10
[ 100.578880][ T52] ? __switch_to_asm+0x39/0x70
[ 100.583664][ T52] ? __switch_to_asm+0x33/0x70
[ 100.588469][ T52] ? __pfx_kthread+0x10/0x10
[ 100.593088][ T52] ret_from_fork_asm+0x1a/0x30
[ 100.597881][ T52]
[ 100.601240][ T52] Kernel Offset: disabled
[ 100.605556][ T52] Rebooting in 86400 seconds..
syzkaller build log:
go env (err=)
AR='ar'
CC='gcc'
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_ENABLED='1'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
CXX='g++'
GCCGO='gccgo'
GO111MODULE='auto'
GOAMD64='v1'
GOARCH='amd64'
GOAUTH='netrc'
GOBIN=''
GOCACHE='/syzkaller/.cache/go-build'
GOCACHEPROG=''
GODEBUG=''
GOENV='/syzkaller/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFIPS140='off'
GOFLAGS=''
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build451289127=/tmp/go-build -gno-record-gcc-switches'
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMOD='/syzkaller/jobs-2/linux/gopath/src/github.com/google/syzkaller/go.mod'
GOMODCACHE='/syzkaller/jobs-2/linux/gopath/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/syzkaller/jobs-2/linux/gopath'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTELEMETRY='local'
GOTELEMETRYDIR='/syzkaller/.config/go/telemetry'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.24.4'
GOWORK=''
PKG_CONFIG='pkg-config'
git status (err=)
HEAD detached at d6cdfb8a7
nothing to commit, working tree clean
tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
go list -f '{{.Stale}}' ./sys/syz-sysgen | grep -q false || go install ./sys/syz-sysgen
make .descriptions
tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
bin/syz-sysgen
touch .descriptions
GOOS=linux GOARCH=amd64 go build -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=d6cdfb8a765c64793bc63cf630e68fbdd0ee0974 -X github.com/google/syzkaller/prog.gitRevisionDate=20250620-130954" -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
mkdir -p ./bin/linux_amd64
g++ -o ./bin/linux_amd64/syz-executor executor/executor.cc \
-m64 -O2 -pthread -Wall -Werror -Wparentheses -Wunused-const-variable -Wframe-larger-than=16384 -Wno-stringop-overflow -Wno-array-bounds -Wno-format-overflow -Wno-unused-but-set-variable -Wno-unused-command-line-argument -static-pie -std=c++17 -I. -Iexecutor/_include -DGOOS_linux=1 -DGOARCH_amd64=1 \
-DHOSTGOOS_linux=1 -DGIT_REVISION=\"d6cdfb8a765c64793bc63cf630e68fbdd0ee0974\"
/usr/bin/ld: /tmp/cchpUD7c.o: in function `Connection::Connect(char const*, char const*)':
executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEPKcS1_]+0x104): warning: Using 'gethostbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking