==================================================================
BUG: KASAN: use-after-free in tcp_probe_timer net/ipv4/tcp_timer.c:378 [inline]
BUG: KASAN: use-after-free in tcp_write_timer_handler net/ipv4/tcp_timer.c:624 [inline]
BUG: KASAN: use-after-free in tcp_write_timer_handler+0x998/0x9f0 net/ipv4/tcp_timer.c:594
Read of size 1 at addr ffff8880318886a5 by task kworker/u4:1/11
CPU: 0 PID: 11 Comm: kworker/u4:1 Not tainted 6.0.0-rc6-syzkaller-00009-g60891ec99e14 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
Workqueue: bat_events batadv_nc_worker
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:317 [inline]
print_report.cold+0x2ba/0x719 mm/kasan/report.c:433
kasan_report+0xb1/0x1e0 mm/kasan/report.c:495
tcp_probe_timer net/ipv4/tcp_timer.c:378 [inline]
tcp_write_timer_handler net/ipv4/tcp_timer.c:624 [inline]
tcp_write_timer_handler+0x998/0x9f0 net/ipv4/tcp_timer.c:594
tcp_write_timer+0xa2/0x2b0 net/ipv4/tcp_timer.c:637
call_timer_fn+0x1a0/0x6b0 kernel/time/timer.c:1474
expire_timers kernel/time/timer.c:1519 [inline]
__run_timers.part.0+0x674/0xa80 kernel/time/timer.c:1790
__run_timers kernel/time/timer.c:1768 [inline]
run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1803
__do_softirq+0x1d3/0x9c6 kernel/softirq.c:571
invoke_softirq kernel/softirq.c:445 [inline]
__irq_exit_rcu+0x123/0x180 kernel/softirq.c:650
irq_exit_rcu+0x5/0x20 kernel/softirq.c:662
sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1106
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:lock_acquire+0x1ef/0x570 kernel/locking/lockdep.c:5634
Code: f9 a2 7e 83 f8 01 0f 85 e8 02 00 00 9c 58 f6 c4 02 0f 85 fb 02 00 00 48 83 7c 24 08 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24
RSP: 0018:ffffc90000107b98 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff92000020f75 RCX: 2aeac47682616b47
RDX: 1ffff1100234e8ae RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff908e5947
R10: fffffbfff211cb28 R11: 0000000000000000 R12: 0000000000000002
R13: 0000000000000000 R14: ffffffff8bf89400 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:280 [inline]
rcu_read_lock include/linux/rcupdate.h:706 [inline]
batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline]
batadv_nc_worker+0x12d/0xfa0 net/batman-adv/network-coding.c:719
process_one_work+0x991/0x1610 kernel/workqueue.c:2289
worker_thread+0x665/0x1080 kernel/workqueue.c:2436
kthread+0x2e4/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
Allocated by task 3640:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:45 [inline]
set_alloc_info mm/kasan/common.c:437 [inline]
__kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:470
kasan_slab_alloc include/linux/kasan.h:224 [inline]
slab_post_alloc_hook mm/slab.h:727 [inline]
slab_alloc_node mm/slub.c:3243 [inline]
slab_alloc mm/slub.c:3251 [inline]
__kmem_cache_alloc_lru mm/slub.c:3258 [inline]
kmem_cache_alloc+0x267/0x3b0 mm/slub.c:3268
kmem_cache_zalloc include/linux/slab.h:723 [inline]
net_alloc net/core/net_namespace.c:404 [inline]
copy_net_ns+0x125/0x760 net/core/net_namespace.c:459
create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226
ksys_unshare+0x445/0x920 kernel/fork.c:3181
__do_sys_unshare kernel/fork.c:3252 [inline]
__se_sys_unshare kernel/fork.c:3250 [inline]
__x64_sys_unshare+0x2d/0x40 kernel/fork.c:3250
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
The buggy address belongs to the object at ffff888031888000
which belongs to the cache net_namespace of size 6784
The buggy address is located 1701 bytes inside of
6784-byte region [ffff888031888000, ffff888031889a80)
The buggy address belongs to the physical page:
page:ffffea0000c62200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x31888
head:ffffea0000c62200 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff88807433cf41
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000001 ffff8881400073c0
raw: 0000000000000000 0000000080040004 00000001ffffffff ffff88807433cf41
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3640, tgid 3640 (syz-executor.0), ts 316152773650, free_ts 0
prep_new_page mm/page_alloc.c:2532 [inline]
get_page_from_freelist+0x109b/0x2ce0 mm/page_alloc.c:4283
__alloc_pages+0x1c7/0x510 mm/page_alloc.c:5515
alloc_pages+0x1a6/0x270 mm/mempolicy.c:2270
alloc_slab_page mm/slub.c:1824 [inline]
allocate_slab+0x27e/0x3d0 mm/slub.c:1969
new_slab mm/slub.c:2029 [inline]
___slab_alloc+0x7f1/0xe10 mm/slub.c:3031
__slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3118
slab_alloc_node mm/slub.c:3209 [inline]
slab_alloc mm/slub.c:3251 [inline]
__kmem_cache_alloc_lru mm/slub.c:3258 [inline]
kmem_cache_alloc+0x38c/0x3b0 mm/slub.c:3268
kmem_cache_zalloc include/linux/slab.h:723 [inline]
net_alloc net/core/net_namespace.c:404 [inline]
copy_net_ns+0x125/0x760 net/core/net_namespace.c:459
create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226
ksys_unshare+0x445/0x920 kernel/fork.c:3181
__do_sys_unshare kernel/fork.c:3252 [inline]
__se_sys_unshare kernel/fork.c:3250 [inline]
__x64_sys_unshare+0x2d/0x40 kernel/fork.c:3250
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
page_owner free stack trace missing
Memory state around the buggy address:
ffff888031888580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888031888600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888031888680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888031888700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888031888780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: f9 stc
1: a2 7e 83 f8 01 0f 85 movabs %al,0x2e8850f01f8837e
8: e8 02
a: 00 00 add %al,(%rax)
c: 9c pushfq
d: 58 pop %rax
e: f6 c4 02 test $0x2,%ah
11: 0f 85 fb 02 00 00 jne 0x312
17: 48 83 7c 24 08 00 cmpq $0x0,0x8(%rsp)
1d: 74 01 je 0x20
1f: fb sti
20: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
27: fc ff df
* 2a: 48 01 c3 add %rax,%rbx <-- trapping instruction
2d: 48 c7 03 00 00 00 00 movq $0x0,(%rbx)
34: 48 c7 43 08 00 00 00 movq $0x0,0x8(%rbx)
3b: 00
3c: 48 rex.W
3d: 8b .byte 0x8b
3e: 84 .byte 0x84
3f: 24 .byte 0x24