==================================================================
BUG: KASAN: use-after-free in hlist_move_list include/linux/list.h:1014 [inline]
BUG: KASAN: use-after-free in collect_expired_timers kernel/time/timer.c:1625 [inline]
BUG: KASAN: use-after-free in __run_timers+0x340/0x9f0 kernel/time/timer.c:1861
Write of size 8 at addr ffff888140328a00 by task kworker/0:5/694
CPU: 0 PID: 694 Comm: kworker/0:5 Tainted: G W syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: usb_hub_wq hub_event
Call Trace:
__dump_stack+0x21/0x24 lib/dump_stack.c:88
dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
print_address_description+0x71/0x200 mm/kasan/report.c:316
print_report+0x4a/0x60 mm/kasan/report.c:420
kasan_report+0x122/0x150 mm/kasan/report.c:524
__asan_report_store8_noabort+0x17/0x20 mm/kasan/report_generic.c:356
hlist_move_list include/linux/list.h:1014 [inline]
collect_expired_timers kernel/time/timer.c:1625 [inline]
__run_timers+0x340/0x9f0 kernel/time/timer.c:1861
run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1888
handle_softirqs+0x1d7/0x600 kernel/softirq.c:642
__do_softirq kernel/softirq.c:680 [inline]
invoke_softirq kernel/softirq.c:497 [inline]
__irq_exit_rcu+0x52/0xf0 kernel/softirq.c:729
irq_exit_rcu+0x9/0x10 kernel/softirq.c:741
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa9/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:console_emit_next_record+0x8a1/0xab0 kernel/printk/printk.c:2797
Code: de 48 81 e6 00 02 00 00 31 ff e8 7a 86 19 00 48 81 e3 00 02 00 00 75 07 e8 ac 81 19 00 eb 06 e8 a5 81 19 00 fb 0f b6 5c 24 17 <66> 43 c7 44 25 20 f8 f8 43 c6 44 25 22 f8 4f 89 74 25 10 66 43 c7
RSP: 0018:ffffc9000e696ee0 EFLAGS: 00000283
RAX: ffffffff8157c81b RBX: 0000000000000001 RCX: 0000000000100000
RDX: ffffc9000e721000 RSI: 000000000000cf8e RDI: 000000000000cf8f
RBP: ffffc9000e6970d0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52001cd2dcc R12: dffffc0000000000
R13: 1ffff92001cd2de8 R14: f8f8f8f8f8f8f8f8 R15: ffffc9000e69711f
console_flush_all kernel/printk/printk.c:-1 [inline]
console_unlock+0x246/0x560 kernel/printk/printk.c:2917
vprintk_emit+0x14d/0x420 kernel/printk/printk.c:2308
dev_vprintk_emit+0x351/0x404 drivers/base/core.c:4934
dev_printk_emit+0xeb/0x13c drivers/base/core.c:4945
__dev_printk+0x17f/0x1b0 drivers/base/core.c:4957
_dev_notice+0x11b/0x178 drivers/base/core.c:5002
usb_parse_endpoint drivers/usb/core/config.c:460 [inline]
usb_parse_interface drivers/usb/core/config.c:600 [inline]
usb_parse_configuration drivers/usb/core/config.c:813 [inline]
usb_get_configuration+0x2bb0/0x4ae0 drivers/usb/core/config.c:962
usb_enumerate_device drivers/usb/core/hub.c:2516 [inline]
usb_new_device+0x146/0x1550 drivers/usb/core/hub.c:2654
hub_port_connect drivers/usb/core/hub.c:5594 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5734 [inline]
port_event drivers/usb/core/hub.c:5898 [inline]
hub_event+0x2aca/0x46b0 drivers/usb/core/hub.c:5980
process_one_work+0x71f/0xc40 kernel/workqueue.c:2302
worker_thread+0xa29/0x11e0 kernel/workqueue.c:2449
kthread+0x281/0x320 kernel/kthread.c:386
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Allocated by task 2701:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
kasan_save_alloc_info+0x25/0x30 mm/kasan/generic.c:505
____kasan_kmalloc mm/kasan/common.c:379 [inline]
__kasan_kmalloc+0x95/0xb0 mm/kasan/common.c:388
kasan_kmalloc include/linux/kasan.h:212 [inline]
__do_kmalloc_node mm/slab_common.c:938 [inline]
__kmalloc+0xb1/0x1e0 mm/slab_common.c:951
kmalloc include/linux/slab.h:568 [inline]
kzalloc include/linux/slab.h:699 [inline]
hci_alloc_dev_priv+0x27/0x1bd0 net/bluetooth/hci_core.c:2433
hci_alloc_dev include/net/bluetooth/hci_core.h:1505 [inline]
hci_uart_register_dev drivers/bluetooth/hci_ldisc.c:641 [inline]
hci_uart_set_proto drivers/bluetooth/hci_ldisc.c:719 [inline]
hci_uart_tty_ioctl+0x3d6/0xa20 drivers/bluetooth/hci_ldisc.c:774
tty_ioctl+0x8ef/0xc60 drivers/tty/tty_io.c:2785
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl+0x12f/0x1b0 fs/ioctl.c:856
__x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:856
x64_sys_call+0x58b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:17
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Freed by task 2701:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
kasan_save_free_info+0x31/0x50 mm/kasan/generic.c:516
____kasan_slab_free+0x132/0x180 mm/kasan/common.c:241
__kasan_slab_free+0x11/0x20 mm/kasan/common.c:249
kasan_slab_free include/linux/kasan.h:178 [inline]
slab_free_hook mm/slub.c:1750 [inline]
slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1776
slab_free mm/slub.c:3712 [inline]
__kmem_cache_free+0xb7/0x1b0 mm/slub.c:3728
kfree+0x6f/0xf0 mm/slab_common.c:990
hci_release_dev+0x12a3/0x13b0 net/bluetooth/hci_core.c:2761
bt_host_release+0x82/0x90 net/bluetooth/hci_sysfs.c:85
device_release+0xa4/0x1d0 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+0x19d/0x280 lib/kobject.c:729
put_device+0x1f/0x30 drivers/base/core.c:3806
hci_dev_put include/net/bluetooth/hci_core.h:1465 [inline]
hci_dev_cmd+0x279/0x740 net/bluetooth/hci_core.c:795
hci_sock_ioctl+0x41e/0x7f0 net/bluetooth/hci_sock.c:1096
sock_do_ioctl+0x114/0x330 net/socket.c:1194
sock_ioctl+0x4ca/0x720 net/socket.c:1311
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl+0x12f/0x1b0 fs/ioctl.c:856
__x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:856
x64_sys_call+0x58b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:17
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Last potentially related work creation:
kasan_save_stack+0x3a/0x60 mm/kasan/common.c:45
__kasan_record_aux_stack+0xb6/0xc0 mm/kasan/generic.c:486
kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:496
insert_work+0x51/0x300 kernel/workqueue.c:1368
__queue_work+0x9b1/0xd30 kernel/workqueue.c:1527
queue_work_on+0xde/0x150 kernel/workqueue.c:1555
queue_work include/linux/workqueue.h:510 [inline]
hci_cmd_sync_run net/bluetooth/hci_sync.c:140 [inline]
__hci_cmd_sync_sk+0xa7f/0xd30 net/bluetooth/hci_sync.c:162
__hci_cmd_sync_status_sk net/bluetooth/hci_sync.c:253 [inline]
__hci_cmd_sync_status net/bluetooth/hci_sync.c:277 [inline]
hci_cmd_sync_status+0x53/0x120 net/bluetooth/hci_sync.c:288
hci_dev_cmd+0x648/0x740 net/bluetooth/hci_core.c:-1
hci_sock_ioctl+0x41e/0x7f0 net/bluetooth/hci_sock.c:1096
sock_do_ioctl+0x114/0x330 net/socket.c:1194
sock_ioctl+0x4ca/0x720 net/socket.c:1311
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl+0x12f/0x1b0 fs/ioctl.c:856
__x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:856
x64_sys_call+0x58b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:17
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Second to last potentially related work creation:
kasan_save_stack+0x3a/0x60 mm/kasan/common.c:45
__kasan_record_aux_stack+0xb6/0xc0 mm/kasan/generic.c:486
kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:496
insert_work+0x51/0x300 kernel/workqueue.c:1368
__queue_work+0x9b1/0xd30 kernel/workqueue.c:1527
queue_work_on+0xde/0x150 kernel/workqueue.c:1555
queue_work include/linux/workqueue.h:510 [inline]
hci_cmd_timeout+0x191/0x200 net/bluetooth/hci_core.c:1468
process_one_work+0x71f/0xc40 kernel/workqueue.c:2302
worker_thread+0xa29/0x11e0 kernel/workqueue.c:2449
kthread+0x281/0x320 kernel/kthread.c:386
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
The buggy address belongs to the object at ffff888140328000
which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 2560 bytes inside of
8192-byte region [ffff888140328000, ffff88814032a000)
The buggy address belongs to the physical page:
page:ffffea000500ca00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x140328
head:ffffea000500ca00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 ffffea00044d2600 dead000000000004 ffff888100043500
raw: 0000000000000000 0000000000020002 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 0x1d2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 1807, tgid 1804 (syz.5.385), ts 72204935665, free_ts 0
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2643
prep_new_page+0x1c/0x110 mm/page_alloc.c:2650
get_page_from_freelist+0x2d12/0x2d80 mm/page_alloc.c:4554
__alloc_pages+0x1d9/0x480 mm/page_alloc.c:5868
alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1
allocate_slab mm/slub.c:1967 [inline]
new_slab+0x98/0x3d0 mm/slub.c:2020
___slab_alloc+0x6bd/0xb20 mm/slub.c:3177
__slab_alloc+0x5e/0xa0 mm/slub.c:3263
slab_alloc_node mm/slub.c:3348 [inline]
__kmem_cache_alloc_node+0x203/0x2c0 mm/slub.c:3423
__do_kmalloc_node mm/slab_common.c:937 [inline]
__kmalloc_node_track_caller+0xa0/0x1e0 mm/slab_common.c:958
kmalloc_reserve net/core/skbuff.c:449 [inline]
pskb_expand_head+0x1b0/0x1210 net/core/skbuff.c:1851
__pskb_pull_tail+0xb1/0x1570 net/core/skbuff.c:2398
__skb_linearize include/linux/skbuff.h:3764 [inline]
skb_linearize include/linux/skbuff.h:3776 [inline]
tipc_msg_reverse+0x78/0x940 net/tipc/msg.c:631
tipc_sk_filter_rcv+0xc13/0x2cf0 net/tipc/socket.c:2376
tipc_sk_enqueue net/tipc/socket.c:2445 [inline]
tipc_sk_rcv+0x7ed/0x2c10 net/tipc/socket.c:2497
tipc_sk_mcast_rcv+0xe3b/0xf20 net/tipc/socket.c:1268
page_owner free stack trace missing
Memory state around the buggy address:
ffff888140328900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888140328980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888140328a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888140328a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888140328b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 694 Comm: kworker/0:5 Tainted: G B W syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: usb_hub_wq hub_event
RIP: 0010:__queue_work+0x575/0xd30 kernel/workqueue.c:-1
Code: 39 2b 0f 84 b9 00 00 00 e8 a8 44 29 00 4c 89 ff e8 a0 80 b7 03 49 bc 00 00 00 00 00 fc ff df 4c 8b 6d d0 4c 89 e8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ef e8 ec 70 6e 00 49 8b 7d 00 e8 33 7c
RSP: 0018:ffffc90000007c70 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 000000007fffffff RCX: ffff88811726a880
RDX: 0000000000000100 RSI: 000000007fffffff RDI: 000000007fffffff
RBP: ffffc90000007d08 R08: 0000000000000007 R09: fffffffffffffffb
R10: dffffc0000000000 R11: ffffed1028065139 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff8881403289c8 R15: 0000000000000008
FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7025dde1b8 CR3: 000000010f947000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
delayed_work_timer_fn+0x61/0x80 kernel/workqueue.c:1653
call_timer_fn+0x46/0x2a0 kernel/time/timer.c:1553
expire_timers kernel/time/timer.c:1599 [inline]
__run_timers+0x689/0x9f0 kernel/time/timer.c:1875
run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1888
handle_softirqs+0x1d7/0x600 kernel/softirq.c:642
__do_softirq kernel/softirq.c:680 [inline]
invoke_softirq kernel/softirq.c:497 [inline]
__irq_exit_rcu+0x52/0xf0 kernel/softirq.c:729
irq_exit_rcu+0x9/0x10 kernel/softirq.c:741
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa9/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:console_emit_next_record+0x8a1/0xab0 kernel/printk/printk.c:2797
Code: de 48 81 e6 00 02 00 00 31 ff e8 7a 86 19 00 48 81 e3 00 02 00 00 75 07 e8 ac 81 19 00 eb 06 e8 a5 81 19 00 fb 0f b6 5c 24 17 <66> 43 c7 44 25 20 f8 f8 43 c6 44 25 22 f8 4f 89 74 25 10 66 43 c7
RSP: 0018:ffffc9000e696ee0 EFLAGS: 00000283
RAX: ffffffff8157c81b RBX: 0000000000000001 RCX: 0000000000100000
RDX: ffffc9000e721000 RSI: 000000000000cf8e RDI: 000000000000cf8f
RBP: ffffc9000e6970d0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52001cd2dcc R12: dffffc0000000000
R13: 1ffff92001cd2de8 R14: f8f8f8f8f8f8f8f8 R15: ffffc9000e69711f
console_flush_all kernel/printk/printk.c:-1 [inline]
console_unlock+0x246/0x560 kernel/printk/printk.c:2917
vprintk_emit+0x14d/0x420 kernel/printk/printk.c:2308
dev_vprintk_emit+0x351/0x404 drivers/base/core.c:4934
dev_printk_emit+0xeb/0x13c drivers/base/core.c:4945
__dev_printk+0x17f/0x1b0 drivers/base/core.c:4957
_dev_notice+0x11b/0x178 drivers/base/core.c:5002
usb_parse_endpoint drivers/usb/core/config.c:460 [inline]
usb_parse_interface drivers/usb/core/config.c:600 [inline]
usb_parse_configuration drivers/usb/core/config.c:813 [inline]
usb_get_configuration+0x2bb0/0x4ae0 drivers/usb/core/config.c:962
usb_enumerate_device drivers/usb/core/hub.c:2516 [inline]
usb_new_device+0x146/0x1550 drivers/usb/core/hub.c:2654
hub_port_connect drivers/usb/core/hub.c:5594 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5734 [inline]
port_event drivers/usb/core/hub.c:5898 [inline]
hub_event+0x2aca/0x46b0 drivers/usb/core/hub.c:5980
process_one_work+0x71f/0xc40 kernel/workqueue.c:2302
worker_thread+0xa29/0x11e0 kernel/workqueue.c:2449
kthread+0x281/0x320 kernel/kthread.c:386
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__queue_work+0x575/0xd30 kernel/workqueue.c:-1
Code: 39 2b 0f 84 b9 00 00 00 e8 a8 44 29 00 4c 89 ff e8 a0 80 b7 03 49 bc 00 00 00 00 00 fc ff df 4c 8b 6d d0 4c 89 e8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ef e8 ec 70 6e 00 49 8b 7d 00 e8 33 7c
RSP: 0018:ffffc90000007c70 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 000000007fffffff RCX: ffff88811726a880
RDX: 0000000000000100 RSI: 000000007fffffff RDI: 000000007fffffff
RBP: ffffc90000007d08 R08: 0000000000000007 R09: fffffffffffffffb
R10: dffffc0000000000 R11: ffffed1028065139 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff8881403289c8 R15: 0000000000000008
FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7025dde1b8 CR3: 000000010f947000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: de 48 81 fimuls -0x7f(%rax)
3: e6 00 out %al,$0x0
5: 02 00 add (%rax),%al
7: 00 31 add %dh,(%rcx)
9: ff ljmp (bad)
a: e8 7a 86 19 00 call 0x198689
f: 48 81 e3 00 02 00 00 and $0x200,%rbx
16: 75 07 jne 0x1f
18: e8 ac 81 19 00 call 0x1981c9
1d: eb 06 jmp 0x25
1f: e8 a5 81 19 00 call 0x1981c9
24: fb sti
25: 0f b6 5c 24 17 movzbl 0x17(%rsp),%ebx
* 2a: 66 43 c7 44 25 20 f8 movw $0xf8f8,0x20(%r13,%r12,1) <-- trapping instruction
31: f8
32: 43 c6 44 25 22 f8 movb $0xf8,0x22(%r13,%r12,1)
38: 4f 89 74 25 10 mov %r14,0x10(%r13,%r12,1)
3d: 66 data16
3e: 43 rex.XB
3f: c7 .byte 0xc7