==================================================================
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+0x341/0x9b0 kernel/time/timer.c:1861
Write of size 8 at addr ffff88811e0a0a00 by task syz.3.420/1349
CPU: 1 PID: 1349 Comm: syz.3.420 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
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+0x341/0x9b0 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:io_wq_create+0x4e4/0xb70 io_uring/io-wq.c:1198
Code: ff 49 8d 7c 24 68 48 89 f8 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 ff 04 00 00 48 81 c3 50 08 00 00 41 c7 44 24 68 00 00 00 00 <4d> 8d 74 24 0c 4c 89 f0 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 f0
RSP: 0018:ffffc9001209fa80 EFLAGS: 00000286
RAX: 0000000000000000 RBX: ffff888112919c90 RCX: 0000000000080000
RDX: ffffc9000265e000 RSI: 00000000000002ca RDI: ffff888112c0a868
RBP: ffffc9001209fb70 R08: 0000000000000dc0 R09: 0000000000000001
R10: ffff8881f5a00000 R11: 0000000055561a39 R12: ffff888112c0a800
R13: ffff88812003b500 R14: ffff88812003b560 R15: dffffc0000000000
io_init_wq_offload io_uring/tctx.c:44 [inline]
io_uring_alloc_task_context+0x296/0x540 io_uring/tctx.c:87
__io_uring_add_tctx_node+0x349/0x4f0 io_uring/tctx.c:112
io_uring_install_fd+0x35/0x80 io_uring/io_uring.c:3571
io_uring_create+0x935/0xde1 io_uring/io_uring.c:3751
io_uring_setup io_uring/io_uring.c:3791 [inline]
__do_sys_io_uring_setup io_uring/io_uring.c:3797 [inline]
__se_sys_io_uring_setup io_uring/io_uring.c:3794 [inline]
__x64_sys_io_uring_setup+0x21b/0x230 io_uring/io_uring.c:3794
x64_sys_call+0x4ab/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:426
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
RIP: 0033:0x7fd62099ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd621914fb8 EFLAGS: 00000206 ORIG_RAX: 00000000000001a9
RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007fd62099ce59
RDX: 0000200000000280 RSI: 0000200000000040 RDI: 000000000000001d
RBP: 00007fd620a32e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000140 R11: 0000000000000206 R12: 0000200000000280
R13: 0000200000000140 R14: 0000200000000100 R15: 00007fff883221e8
Allocated by task 1211:
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
kasan_save_alloc_info+0x1f/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+0xb4/0x1e0 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+0x3c4/0xa40 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 1211:
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
kasan_save_free_info+0x2b/0x40 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+0x475/0x700 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+0x9d0/0xd50 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+0xaa8/0xd80 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+0x642/0x740 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+0x475/0x700 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+0x9d0/0xd50 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+0x717/0xc30 kernel/workqueue.c:2302
worker_thread+0xa4d/0x11d0 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 ffff88811e0a0000
which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 2560 bytes inside of
8192-byte region [ffff88811e0a0000, ffff88811e0a2000)
The buggy address belongs to the physical page:
page:ffffea0004782800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11e0a0
head:ffffea0004782800 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 0000000000000000 dead000000000001 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 141, tgid 141 (dhcpcd), ts 6780648258, 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+0x2ca9/0x2d20 mm/page_alloc.c:4586
__alloc_pages+0x1fa/0x610 mm/page_alloc.c:5930
alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1
allocate_slab mm/slub.c:1967 [inline]
new_slab+0x98/0x3e0 mm/slub.c:2020
___slab_alloc+0x70f/0xb70 mm/slub.c:3177
__slab_alloc+0x5e/0xa0 mm/slub.c:3263
slab_alloc_node mm/slub.c:3348 [inline]
__kmem_cache_alloc_node+0x204/0x2d0 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:223 [inline]
common_lsm_audit+0x1de/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]
path_has_perm security/selinux/hooks.c:1671 [inline]
selinux_inode_getattr+0x2c3/0x3d0 security/selinux/hooks.c:3166
security_inode_getattr+0xe7/0x140 security/security.c:1362
page_owner free stack trace missing
Memory state around the buggy address:
ffff88811e0a0900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88811e0a0980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88811e0a0a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88811e0a0a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88811e0a0b00: 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: 1349 Comm: syz.3.420 Tainted: G B syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:__queue_work+0x582/0xd50 kernel/workqueue.c:-1
Code: b4 00 00 00 e8 7f 4d 29 00 48 bb 00 00 00 00 00 fc ff df 4c 89 ef e8 ed e7 b8 03 4c 8b 65 d0 4c 8b 6d c0 4c 89 f0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 f7 e8 30 d8 6e 00 49 8b 3e e8 88 e3 b8 03
RSP: 0018:ffffc900001b0c78 EFLAGS: 00010046
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff888112919440
RDX: 0000000000000100 RSI: 000000007fffffff RDI: 000000007fffffff
RBP: ffffc900001b0d08 R08: 0000000000000007 R09: 00000000fffffffb
R10: dffffc0000000000 R11: ffffed1023c14139 R12: ffff88811e0a09c8
R13: ffff88811e2bd400 R14: 0000000000000000 R15: 000000007fffffff
FS: 00007fd6219156c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd620a4f270 CR3: 000000012112b000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000001800
DR3: 0000000000000000 DR6: 00000000ffff0ff0 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+0x672/0x9b0 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:io_wq_create+0x4e4/0xb70 io_uring/io-wq.c:1198
Code: ff 49 8d 7c 24 68 48 89 f8 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 ff 04 00 00 48 81 c3 50 08 00 00 41 c7 44 24 68 00 00 00 00 <4d> 8d 74 24 0c 4c 89 f0 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 f0
RSP: 0018:ffffc9001209fa80 EFLAGS: 00000286
RAX: 0000000000000000 RBX: ffff888112919c90 RCX: 0000000000080000
RDX: ffffc9000265e000 RSI: 00000000000002ca RDI: ffff888112c0a868
RBP: ffffc9001209fb70 R08: 0000000000000dc0 R09: 0000000000000001
R10: ffff8881f5a00000 R11: 0000000055561a39 R12: ffff888112c0a800
R13: ffff88812003b500 R14: ffff88812003b560 R15: dffffc0000000000
io_init_wq_offload io_uring/tctx.c:44 [inline]
io_uring_alloc_task_context+0x296/0x540 io_uring/tctx.c:87
__io_uring_add_tctx_node+0x349/0x4f0 io_uring/tctx.c:112
io_uring_install_fd+0x35/0x80 io_uring/io_uring.c:3571
io_uring_create+0x935/0xde1 io_uring/io_uring.c:3751
io_uring_setup io_uring/io_uring.c:3791 [inline]
__do_sys_io_uring_setup io_uring/io_uring.c:3797 [inline]
__se_sys_io_uring_setup io_uring/io_uring.c:3794 [inline]
__x64_sys_io_uring_setup+0x21b/0x230 io_uring/io_uring.c:3794
x64_sys_call+0x4ab/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:426
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
RIP: 0033:0x7fd62099ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd621914fb8 EFLAGS: 00000206 ORIG_RAX: 00000000000001a9
RAX: ffffffffffffffda RBX: 0000200000000040 RCX: 00007fd62099ce59
RDX: 0000200000000280 RSI: 0000200000000040 RDI: 000000000000001d
RBP: 00007fd620a32e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000140 R11: 0000000000000206 R12: 0000200000000280
R13: 0000200000000140 R14: 0000200000000100 R15: 00007fff883221e8
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__queue_work+0x582/0xd50 kernel/workqueue.c:-1
Code: b4 00 00 00 e8 7f 4d 29 00 48 bb 00 00 00 00 00 fc ff df 4c 89 ef e8 ed e7 b8 03 4c 8b 65 d0 4c 8b 6d c0 4c 89 f0 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 f7 e8 30 d8 6e 00 49 8b 3e e8 88 e3 b8 03
RSP: 0018:ffffc900001b0c78 EFLAGS: 00010046
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff888112919440
RDX: 0000000000000100 RSI: 000000007fffffff RDI: 000000007fffffff
RBP: ffffc900001b0d08 R08: 0000000000000007 R09: 00000000fffffffb
R10: dffffc0000000000 R11: ffffed1023c14139 R12: ffff88811e0a09c8
R13: ffff88811e2bd400 R14: 0000000000000000 R15: 000000007fffffff
FS: 00007fd6219156c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd620a4f270 CR3: 000000012112b000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000001800
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: ff 49 8d decl -0x73(%rcx)
3: 7c 24 jl 0x29
5: 68 48 89 f8 48 push $0x48f88948
a: c1 e8 03 shr $0x3,%eax
d: 42 0f b6 04 38 movzbl (%rax,%r15,1),%eax
12: 84 c0 test %al,%al
14: 0f 85 ff 04 00 00 jne 0x519
1a: 48 81 c3 50 08 00 00 add $0x850,%rbx
21: 41 c7 44 24 68 00 00 movl $0x0,0x68(%r12)
28: 00 00
* 2a: 4d 8d 74 24 0c lea 0xc(%r12),%r14 <-- trapping instruction
2f: 4c 89 f0 mov %r14,%rax
32: 48 c1 e8 03 shr $0x3,%rax
36: 42 0f b6 04 38 movzbl (%rax,%r15,1),%eax
3b: 84 c0 test %al,%al
3d: 0f .byte 0xf
3e: 85 f0 test %esi,%eax