==================================================================
BUG: KASAN: use-after-free in tcp_retransmit_timer+0x2f87/0x3400 net/ipv4/tcp_timer.c:509
Read of size 8 at addr ffff888075e782c0 by task kworker/0:6/3678
CPU: 0 PID: 3678 Comm: kworker/0:6 Not tainted 6.0.0-syzkaller-02765-g62c69e89e81b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Workqueue: events nsim_dev_trap_report_work
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_retransmit_timer+0x2f87/0x3400 net/ipv4/tcp_timer.c:509
tcp_write_timer_handler net/ipv4/tcp_timer.c:620 [inline]
tcp_write_timer_handler+0x4de/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+0x1d0/0x9c8 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:1107
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: 0f 1f 44 00 00 55 48 8b 74 24 08 48 89 fd 48 83 c7 18 e8 3e 22 d8 f7 48 89 ef e8 c6 a3 d8 f7 e8 e1 35 fb f7 fb bf 01 00 00 00 a6 61 cb f7 65 8b 05 5f 18 7c 76 85 c0 74 02 5d c3 e8 de 1d 7a
RSP: 0018:ffffc90004d67d08 EFLAGS: 00000206
RAX: 00000000000607f9 RBX: 0000000000000000 RCX: 1ffffffff1bbfd69
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffff8880b9a39800 R08: 0000000000000001 R09: 0000000000000001
R10: ffffed1017347300 R11: 0000000000000000 R12: 0000000000000001
R13: ffff8880554c5810 R14: ffff88807b15d000 R15: ffff8880b9a39800
process_one_work+0x88c/0x1610 kernel/workqueue.c:2262
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 3623:
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:3248 [inline]
slab_alloc mm/slub.c:3256 [inline]
__kmem_cache_alloc_lru mm/slub.c:3263 [inline]
kmem_cache_alloc+0x267/0x3b0 mm/slub.c:3273
kmem_cache_zalloc include/linux/slab.h:723 [inline]
net_alloc net/core/net_namespace.c:403 [inline]
copy_net_ns+0x125/0x760 net/core/net_namespace.c:458
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
Last potentially related work creation:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
__kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348
insert_work+0x48/0x350 kernel/workqueue.c:1358
__queue_work+0x625/0x1200 kernel/workqueue.c:1517
call_timer_fn+0x1a0/0x6b0 kernel/time/timer.c:1474
expire_timers kernel/time/timer.c:1514 [inline]
__run_timers.part.0+0x4a3/0xa80 kernel/time/timer.c:1790
__run_timers kernel/time/timer.c:1768 [inline]
run_timer_softirq+0x152/0x1d0 kernel/time/timer.c:1805
__do_softirq+0x1d0/0x9c8 kernel/softirq.c:571
The buggy address belongs to the object at ffff888075e78000
which belongs to the cache net_namespace of size 6976
The buggy address is located 704 bytes inside of
6976-byte region [ffff888075e78000, ffff888075e79b40)
The buggy address belongs to the physical page:
page:ffffea0001d79e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888075e78000 pfn:0x75e78
head:ffffea0001d79e00 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff8880756472c1
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffff8880119d5288 ffffea0001603e08 ffff8880119d43c0
raw: ffff888075e78000 0000000000040001 00000001ffffffff ffff8880756472c1
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 3623, tgid 3623 (syz-executor.3), ts 54763304275, free_ts 54760892472
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:5549
alloc_pages+0x1a6/0x270 mm/mempolicy.c:2270
alloc_slab_page mm/slub.c:1829 [inline]
allocate_slab+0x27e/0x3d0 mm/slub.c:1974
new_slab mm/slub.c:2034 [inline]
___slab_alloc+0x84f/0xe80 mm/slub.c:3036
__slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3123
slab_alloc_node mm/slub.c:3214 [inline]
slab_alloc mm/slub.c:3256 [inline]
__kmem_cache_alloc_lru mm/slub.c:3263 [inline]
kmem_cache_alloc+0x38c/0x3b0 mm/slub.c:3273
kmem_cache_zalloc include/linux/slab.h:723 [inline]
net_alloc net/core/net_namespace.c:403 [inline]
copy_net_ns+0x125/0x760 net/core/net_namespace.c:458
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 last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1449 [inline]
free_pcp_prepare+0x5e4/0xd20 mm/page_alloc.c:1499
free_unref_page_prepare mm/page_alloc.c:3380 [inline]
free_unref_page+0x19/0x4d0 mm/page_alloc.c:3476
__unfreeze_partials+0x17c/0x1a0 mm/slub.c:2553
qlink_free mm/kasan/quarantine.c:168 [inline]
qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:447
kasan_slab_alloc include/linux/kasan.h:224 [inline]
slab_post_alloc_hook mm/slab.h:727 [inline]
slab_alloc_node mm/slub.c:3248 [inline]
kmem_cache_alloc_node+0x2b1/0x3f0 mm/slub.c:3298
__alloc_skb+0x210/0x2f0 net/core/skbuff.c:497
alloc_skb include/linux/skbuff.h:1265 [inline]
alloc_skb_with_frags+0x93/0x6c0 net/core/skbuff.c:6124
sock_alloc_send_pskb+0x7a3/0x930 net/core/sock.c:2719
unix_dgram_sendmsg+0x415/0x1b50 net/unix/af_unix.c:1943
sock_sendmsg_nosec net/socket.c:714 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:734
sock_write_iter+0x291/0x3d0 net/socket.c:1108
call_write_iter include/linux/fs.h:2187 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x9e9/0xdd0 fs/read_write.c:584
ksys_write+0x1e8/0x250 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
Memory state around the buggy address:
ffff888075e78180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888075e78200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888075e78280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888075e78300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888075e78380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
5: 55 push %rbp
6: 48 8b 74 24 08 mov 0x8(%rsp),%rsi
b: 48 89 fd mov %rdi,%rbp
e: 48 83 c7 18 add $0x18,%rdi
12: e8 3e 22 d8 f7 callq 0xf7d82255
17: 48 89 ef mov %rbp,%rdi
1a: e8 c6 a3 d8 f7 callq 0xf7d8a3e5
1f: e8 e1 35 fb f7 callq 0xf7fb3605
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 a6 61 cb f7 callq 0xf7cb61d5 <-- trapping instruction
2f: 65 8b 05 5f 18 7c 76 mov %gs:0x767c185f(%rip),%eax # 0x767c1895
36: 85 c0 test %eax,%eax
38: 74 02 je 0x3c
3a: 5d pop %rbp
3b: c3 retq
3c: e8 .byte 0xe8
3d: de .byte 0xde
3e: 1d .byte 0x1d
3f: 7a .byte 0x7a