==================================================================
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 ffff88810ffaca00 by task syz.9.977/3789
CPU: 1 PID: 3789 Comm: syz.9.977 Tainted: G W syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
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_call_function_single arch/x86/kernel/smp.c:262 [inline]
sysvec_call_function_single+0xa6/0xc0 arch/x86/kernel/smp.c:262
asm_sysvec_call_function_single+0x1b/0x20 arch/x86/include/asm/idtentry.h:699
RIP: 0010:finish_task_switch+0x173/0x7b0 kernel/sched/core.c:5302
Code: 80 3c 2b 00 74 08 4c 89 f7 e8 39 ab 69 00 4d 8b 2e 4d 85 ed 0f 85 cd 00 00 00 4c 89 e7 e8 c5 f3 b4 03 fb 49 8d 9f 48 0b 00 00 <48> 89 d8 48 c1 e8 03 49 bd 00 00 00 00 00 fc ff df 42 0f b6 04 28
RSP: 0000:ffffc90000c77d20 EFLAGS: 00000282
RAX: 0000000080000001 RBX: ffff88811ea3f088 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff85ca8f00 RDI: 00000000ffffffff
RBP: ffffc90000c77d70 R08: ffff888113b01447 R09: 1ffff11022760288
R10: dffffc0000000000 R11: ffffed1022760289 R12: ffff8881f6f37d80
R13: 0000000000000000 R14: ffff8881f6f388e0 R15: ffff88811ea3e540
context_switch kernel/sched/core.c:5428 [inline]
__schedule+0xbae/0x1500 kernel/sched/core.c:6755
schedule+0xbd/0x170 kernel/sched/core.c:6831
exit_to_user_mode_loop+0x51/0xb0 kernel/entry/common.c:165
exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210
irqentry_exit_to_user_mode+0x9/0x10 kernel/entry/common.c:316
irqentry_exit+0x12/0x40 kernel/entry/common.c:419
sysvec_reschedule_ipi+0x78/0x80 arch/x86/kernel/smp.c:244
asm_sysvec_reschedule_ipi+0x1b/0x20 arch/x86/include/asm/idtentry.h:696
RIP: 0033:0x7f5f09471490
Code: d5 00 49 39 54 24 28 0f 82 5e 03 00 00 40 0f b6 fe c6 44 24 0e 01 45 31 ed 45 31 f6 89 7c 24 08 85 c0 0f 84 10 01 00 00 66 90 <48> 8b 3c 24 49 8b 54 24 40 4c 89 f0 4a 03 14 ef 80 3d 01 69 3a 00
RSP: 002b:00007ffcf4c263e0 EFLAGS: 00000297
RAX: 0000000000000001 RBX: ffffffff819d933f RCX: ffffffff819d933f
RDX: 000000000000133f RSI: ffffffff819d933f RDI: 0000000000000008
RBP: 0000000000000000 R08: 00007f5f09800000 R09: 00007f5f09802000
R10: 00000000819d9343 R11: 0000000000000008 R12: 00007f5f09816038
R13: 000000000000c664 R14: ffffffff819d9a8e R15: 00007f5f0a345720
Allocated by task 3677:
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
kasan_save_alloc_info+0x25/0x30 mm/kasan/generic.c:505
____kasan_kmalloc mm/kasan/common.c:380 [inline]
__kasan_kmalloc+0x95/0xb0 mm/kasan/common.c:389
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+0x3c8/0xa20 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:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Freed by task 3677:
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
kasan_save_free_info+0x31/0x50 mm/kasan/generic.c:516
____kasan_slab_free+0x132/0x180 mm/kasan/common.c:242
__kasan_slab_free+0x11/0x20 mm/kasan/common.c:250
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:1191
sock_ioctl+0x4bd/0x710 net/socket.c:1310
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:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Last potentially related work creation:
kasan_save_stack+0x3a/0x60 mm/kasan/common.c:46
__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:1191
sock_ioctl+0x4bd/0x710 net/socket.c:1310
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:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Second to last potentially related work creation:
kasan_save_stack+0x3a/0x60 mm/kasan/common.c:46
__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 ffff88810ffac000
which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 2560 bytes inside of
8192-byte region [ffff88810ffac000, ffff88810ffae000)
The buggy address belongs to the physical page:
page:ffffea00043fea00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10ffa8
head:ffffea00043fea00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 ffffea000434ee00 dead000000000003 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 0x52a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 87, tgid 87 (acpid), ts 3457871378, free_ts 0
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2672
prep_new_page+0x1c/0x110 mm/page_alloc.c:2679
get_page_from_freelist+0x2d12/0x2d80 mm/page_alloc.c:4585
__alloc_pages+0x1fa/0x610 mm/page_alloc.c:5929
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
kmalloc_trace+0x29/0xb0 mm/slab_common.c:1028
kmalloc include/linux/slab.h:563 [inline]
audit_log_d_path+0xc6/0x240 kernel/audit.c:2151
dump_common_audit_data security/lsm_audit.c:236 [inline]
common_lsm_audit+0x330/0x1730 security/lsm_audit.c:457
slow_avc_audit+0x1c4/0x240 security/selinux/avc.c:804
avc_audit security/selinux/include/avc.h:136 [inline]
avc_has_perm+0x1fb/0x250 security/selinux/avc.c:1201
inode_has_perm security/selinux/hooks.c:1638 [inline]
file_has_perm+0x52d/0x700 security/selinux/hooks.c:1730
match_file+0xc8/0x130 security/selinux/hooks.c:2401
page_owner free stack trace missing
Memory state around the buggy address:
ffff88810ffac900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88810ffac980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88810ffaca00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88810ffaca80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88810ffacb00: 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: 1 PID: 3789 Comm: syz.9.977 Tainted: G B W syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:__queue_work+0x575/0xd30 kernel/workqueue.c:-1
Code: 39 2b 0f 84 b9 00 00 00 e8 f8 51 29 00 4c 89 ff e8 c0 3f ba 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 fc f6 6e 00 49 8b 7d 00 e8 53 3b
RSP: 0000:ffffc900001b0c70 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 000000007fffffff RCX: ffff88811ea3e540
RDX: 0000000000000100 RSI: 000000007fffffff RDI: 000000007fffffff
RBP: ffffc900001b0d08 R08: 0000000000000007 R09: fffffffffffffffb
R10: dffffc0000000000 R11: ffffed1021ff5939 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff88810ffac9c8 R15: 0000000000000008
FS: 000055555fe0c500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000006b000 CR3: 00000001300cd000 CR4: 00000000003506a0
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_call_function_single arch/x86/kernel/smp.c:262 [inline]
sysvec_call_function_single+0xa6/0xc0 arch/x86/kernel/smp.c:262
asm_sysvec_call_function_single+0x1b/0x20 arch/x86/include/asm/idtentry.h:699
RIP: 0010:finish_task_switch+0x173/0x7b0 kernel/sched/core.c:5302
Code: 80 3c 2b 00 74 08 4c 89 f7 e8 39 ab 69 00 4d 8b 2e 4d 85 ed 0f 85 cd 00 00 00 4c 89 e7 e8 c5 f3 b4 03 fb 49 8d 9f 48 0b 00 00 <48> 89 d8 48 c1 e8 03 49 bd 00 00 00 00 00 fc ff df 42 0f b6 04 28
RSP: 0000:ffffc90000c77d20 EFLAGS: 00000282
RAX: 0000000080000001 RBX: ffff88811ea3f088 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff85ca8f00 RDI: 00000000ffffffff
RBP: ffffc90000c77d70 R08: ffff888113b01447 R09: 1ffff11022760288
R10: dffffc0000000000 R11: ffffed1022760289 R12: ffff8881f6f37d80
R13: 0000000000000000 R14: ffff8881f6f388e0 R15: ffff88811ea3e540
context_switch kernel/sched/core.c:5428 [inline]
__schedule+0xbae/0x1500 kernel/sched/core.c:6755
schedule+0xbd/0x170 kernel/sched/core.c:6831
exit_to_user_mode_loop+0x51/0xb0 kernel/entry/common.c:165
exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210
irqentry_exit_to_user_mode+0x9/0x10 kernel/entry/common.c:316
irqentry_exit+0x12/0x40 kernel/entry/common.c:419
sysvec_reschedule_ipi+0x78/0x80 arch/x86/kernel/smp.c:244
asm_sysvec_reschedule_ipi+0x1b/0x20 arch/x86/include/asm/idtentry.h:696
RIP: 0033:0x7f5f09471490
Code: d5 00 49 39 54 24 28 0f 82 5e 03 00 00 40 0f b6 fe c6 44 24 0e 01 45 31 ed 45 31 f6 89 7c 24 08 85 c0 0f 84 10 01 00 00 66 90 <48> 8b 3c 24 49 8b 54 24 40 4c 89 f0 4a 03 14 ef 80 3d 01 69 3a 00
RSP: 002b:00007ffcf4c263e0 EFLAGS: 00000297
RAX: 0000000000000001 RBX: ffffffff819d933f RCX: ffffffff819d933f
RDX: 000000000000133f RSI: ffffffff819d933f RDI: 0000000000000008
RBP: 0000000000000000 R08: 00007f5f09800000 R09: 00007f5f09802000
R10: 00000000819d9343 R11: 0000000000000008 R12: 00007f5f09816038
R13: 000000000000c664 R14: ffffffff819d9a8e R15: 00007f5f0a345720
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 f8 51 29 00 4c 89 ff e8 c0 3f ba 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 fc f6 6e 00 49 8b 7d 00 e8 53 3b
RSP: 0000:ffffc900001b0c70 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 000000007fffffff RCX: ffff88811ea3e540
RDX: 0000000000000100 RSI: 000000007fffffff RDI: 000000007fffffff
RBP: ffffc900001b0d08 R08: 0000000000000007 R09: fffffffffffffffb
R10: dffffc0000000000 R11: ffffed1021ff5939 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff88810ffac9c8 R15: 0000000000000008
FS: 000055555fe0c500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000006b000 CR3: 00000001300cd000 CR4: 00000000003506a0
----------------
Code disassembly (best guess):
0: 80 3c 2b 00 cmpb $0x0,(%rbx,%rbp,1)
4: 74 08 je 0xe
6: 4c 89 f7 mov %r14,%rdi
9: e8 39 ab 69 00 call 0x69ab47
e: 4d 8b 2e mov (%r14),%r13
11: 4d 85 ed test %r13,%r13
14: 0f 85 cd 00 00 00 jne 0xe7
1a: 4c 89 e7 mov %r12,%rdi
1d: e8 c5 f3 b4 03 call 0x3b4f3e7
22: fb sti
23: 49 8d 9f 48 0b 00 00 lea 0xb48(%r15),%rbx
* 2a: 48 89 d8 mov %rbx,%rax <-- trapping instruction
2d: 48 c1 e8 03 shr $0x3,%rax
31: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13
38: fc ff df
3b: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax