==================================================================
BUG: KASAN: use-after-free in tcp_retransmit_timer+0x6df/0x2810 net/ipv4/tcp_timer.c:531
Read of size 8 at addr ffff88808d628258 by task kworker/u5:0/146
CPU: 0 PID: 146 Comm: kworker/u5:0 Not tainted 5.15.152-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
Workqueue: hci15 hci_conn_timeout
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
print_address_description+0x63/0x3b0 mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:434 [inline]
kasan_report+0x16b/0x1c0 mm/kasan/report.c:451
tcp_retransmit_timer+0x6df/0x2810 net/ipv4/tcp_timer.c:531
tcp_write_timer_handler+0x1f7/0x9c0 net/ipv4/tcp_timer.c:644
tcp_write_timer+0x12e/0x280 net/ipv4/tcp_timer.c:664
call_timer_fn+0x16d/0x560 kernel/time/timer.c:1421
expire_timers kernel/time/timer.c:1466 [inline]
__run_timers+0x67c/0x890 kernel/time/timer.c:1737
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1750
__do_softirq+0x3b3/0x93a kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x155/0x240 kernel/softirq.c:637
irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1096
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:arch_test_and_set_bit arch/x86/include/asm/bitops.h:138 [inline]
RIP: 0010:test_and_set_bit include/asm-generic/bitops/instrumented-atomic.h:71 [inline]
RIP: 0010:queue_work_on+0x1f4/0x250 kernel/workqueue.c:1558
Code: 11 e8 70 ac 2d 00 4d 85 e4 75 16 e8 66 ac 2d 00 eb 15 e8 5f ac 2d 00 e8 8a 3b c9 08 4d 85 e4 74 ea e8 50 ac 2d 00 fb 45 84 ed <0f> 94 c0 48 c7 44 24 20 0e 36 e0 45 48 b9 00 00 00 00 00 fc ff df
RSP: 0000:ffffc9000129f9c0 EFLAGS: 00000246
RAX: ffffffff81528d80 RBX: 0000000000000000 RCX: ffff888012be8000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000129faa0 R08: ffffffff81528d56 R09: fffffbfff1f79e44
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000200
R13: 0000000000000000 R14: 0000000000000046 R15: 1ffff92000253f3c
queue_work include/linux/workqueue.h:512 [inline]
req_run+0x34f/0x480 net/bluetooth/hci_request.c:88
hci_req_run net/bluetooth/hci_request.c:95 [inline]
hci_abort_conn+0x1a7/0x2c0 net/bluetooth/hci_request.c:2925
process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310
worker_thread+0xaca/0x1280 kernel/workqueue.c:2457
kthread+0x3f6/0x4f0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
Allocated by task 12766:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
__kasan_slab_alloc+0x8e/0xc0 mm/kasan/common.c:467
kasan_slab_alloc include/linux/kasan.h:254 [inline]
slab_post_alloc_hook+0x53/0x380 mm/slab.h:519
slab_alloc_node mm/slub.c:3220 [inline]
slab_alloc mm/slub.c:3228 [inline]
kmem_cache_alloc+0xf3/0x280 mm/slub.c:3233
kmem_cache_zalloc include/linux/slab.h:711 [inline]
net_alloc net/core/net_namespace.c:405 [inline]
copy_net_ns+0x143/0x5d0 net/core/net_namespace.c:460
create_new_namespaces+0x425/0x7a0 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0x11e/0x170 kernel/nsproxy.c:226
ksys_unshare+0x580/0xb20 kernel/fork.c:3101
__do_sys_unshare kernel/fork.c:3175 [inline]
__se_sys_unshare kernel/fork.c:3173 [inline]
__x64_sys_unshare+0x34/0x40 kernel/fork.c:3173
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
The buggy address belongs to the object at ffff88808d628000
which belongs to the cache net_namespace of size 6464
The buggy address is located 600 bytes inside of
6464-byte region [ffff88808d628000, ffff88808d629940)
The buggy address belongs to the page:
page:ffffea0002358a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8d628
head:ffffea0002358a00 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff88801b558581
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 0000000100000001 ffff888011dea3c0
raw: 0000000000000000 0000000080040004 00000001ffffffff ffff88801b558581
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 13919, ts 505051657470, free_ts 505050338952
prep_new_page mm/page_alloc.c:2426 [inline]
get_page_from_freelist+0x322a/0x33c0 mm/page_alloc.c:4159
__alloc_pages+0x272/0x700 mm/page_alloc.c:5421
alloc_slab_page mm/slub.c:1775 [inline]
allocate_slab mm/slub.c:1912 [inline]
new_slab+0xbb/0x4b0 mm/slub.c:1975
___slab_alloc+0x6f6/0xe10 mm/slub.c:3008
__slab_alloc mm/slub.c:3095 [inline]
slab_alloc_node mm/slub.c:3186 [inline]
slab_alloc mm/slub.c:3228 [inline]
kmem_cache_alloc+0x18e/0x280 mm/slub.c:3233
kmem_cache_zalloc include/linux/slab.h:711 [inline]
net_alloc net/core/net_namespace.c:405 [inline]
copy_net_ns+0x143/0x5d0 net/core/net_namespace.c:460
create_new_namespaces+0x425/0x7a0 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0x11e/0x170 kernel/nsproxy.c:226
ksys_unshare+0x580/0xb20 kernel/fork.c:3101
__do_sys_unshare kernel/fork.c:3175 [inline]
__se_sys_unshare kernel/fork.c:3173 [inline]
__x64_sys_unshare+0x34/0x40 kernel/fork.c:3173
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1340 [inline]
free_pcp_prepare mm/page_alloc.c:1391 [inline]
free_unref_page_prepare+0xc34/0xcf0 mm/page_alloc.c:3317
free_unref_page+0x95/0x2d0 mm/page_alloc.c:3396
free_nonslab_page+0xe4/0x150 mm/slub.c:3535
kfree+0x1cf/0x270 mm/slub.c:4556
skb_free_head net/core/skbuff.c:655 [inline]
skb_release_data+0x73a/0x8a0 net/core/skbuff.c:677
skb_release_all net/core/skbuff.c:742 [inline]
__kfree_skb net/core/skbuff.c:756 [inline]
consume_skb+0xa3/0x140 net/core/skbuff.c:914
skb_free_datagram+0x24/0xe0 net/core/datagram.c:325
netlink_recvmsg+0x5ef/0x1190 net/netlink/af_netlink.c:2002
____sys_recvmsg+0x286/0x530
___sys_recvmsg+0x1ec/0x690 net/socket.c:2692
__sys_recvmsg net/socket.c:2722 [inline]
__do_sys_recvmsg net/socket.c:2732 [inline]
__se_sys_recvmsg net/socket.c:2729 [inline]
__x64_sys_recvmsg+0x1dc/0x2b0 net/socket.c:2729
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
Memory state around the buggy address:
ffff88808d628100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88808d628180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88808d628200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88808d628280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88808d628300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
vkms_vblank_simulate: vblank timer overrun
----------------
Code disassembly (best guess):
0: 11 e8 adc %ebp,%eax
2: 70 ac jo 0xffffffb0
4: 2d 00 4d 85 e4 sub $0xe4854d00,%eax
9: 75 16 jne 0x21
b: e8 66 ac 2d 00 call 0x2dac76
10: eb 15 jmp 0x27
12: e8 5f ac 2d 00 call 0x2dac76
17: e8 8a 3b c9 08 call 0x8c93ba6
1c: 4d 85 e4 test %r12,%r12
1f: 74 ea je 0xb
21: e8 50 ac 2d 00 call 0x2dac76
26: fb sti
27: 45 84 ed test %r13b,%r13b
* 2a: 0f 94 c0 sete %al <-- trapping instruction
2d: 48 c7 44 24 20 0e 36 movq $0x45e0360e,0x20(%rsp)
34: e0 45
36: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx
3d: fc ff df