==================================================================
BUG: KASAN: use-after-free in tcp_retransmit_timer+0x2ea2/0x3320 net/ipv4/tcp_timer.c:511
Read of size 8 at addr ffff888077aa9c90 by task syz-executor446/4074

CPU: 0 PID: 4074 Comm: syz-executor446 Not tainted 5.16.0-rc6-next-20211224-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description.constprop.0.cold+0xa5/0x3ed mm/kasan/report.c:255
 __kasan_report mm/kasan/report.c:442 [inline]
 kasan_report.cold+0x83/0xdf mm/kasan/report.c:459
 tcp_retransmit_timer+0x2ea2/0x3320 net/ipv4/tcp_timer.c:511
 tcp_write_timer_handler+0x5e6/0xbc0 net/ipv4/tcp_timer.c:622
 tcp_write_timer+0xa2/0x2b0 net/ipv4/tcp_timer.c:642
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
 expire_timers kernel/time/timer.c:1466 [inline]
 __run_timers.part.0+0x67c/0xa30 kernel/time/timer.c:1734
 __run_timers kernel/time/timer.c:1715 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:tomoyo_check_path_acl+0x10/0x210 security/tomoyo/file.c:258
Code: e8 15 4d 13 fe e9 c9 fe ff ff e8 eb 4c 13 fe e9 1f ff ff ff 66 0f 1f 44 00 00 41 57 41 56 41 55 41 54 49 89 f4 55 48 89 fd 53 <e8> cb 3e c8 fd 48 8d 7d 28 48 b8 00 00 00 00 00 fc ff df 48 89 fa
RSP: 0018:ffffc9000283fa38 EFLAGS: 00000293
RAX: ffffffff83afc5a0 RBX: ffff88806f00c180 RCX: 0000000000000000
RDX: ffff88801fa81d00 RSI: ffff88806f00c180 RDI: ffffc9000283fba0
RBP: ffffc9000283fba0 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff83af6ea1 R11: 0000000000000000 R12: ffff88806f00c180
R13: ffff88806fb71810 R14: 0000000000000000 R15: 0000000000000000
 tomoyo_check_acl+0x13c/0x450 security/tomoyo/domain.c:175
 tomoyo_path_permission security/tomoyo/file.c:586 [inline]
 tomoyo_path_permission+0x1ff/0x3a0 security/tomoyo/file.c:573
 tomoyo_path_perm+0x2f0/0x400 security/tomoyo/file.c:838
 tomoyo_path_unlink+0x8e/0xd0 security/tomoyo/tomoyo.c:149
 security_path_unlink+0xd7/0x150 security/security.c:1148
 do_unlinkat+0x360/0x650 fs/namei.c:4214
 __do_sys_unlink fs/namei.c:4266 [inline]
 __se_sys_unlink fs/namei.c:4264 [inline]
 __x64_sys_unlink+0xc6/0x110 fs/namei.c:4264
 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+0x44/0xae
RIP: 0033:0x7f8c9ee54117
Code: 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc77a8bba8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8c9ee54117
RDX: 00007ffc77a8bbd0 RSI: 00007ffc77a8bbd0 RDI: 00007ffc77a8bc60
RBP: 00007ffc77a8bc60 R08: 0000000000000001 R09: 00007ffc77a8ba40
R10: 0000555556245873 R11: 0000000000000206 R12: 00007ffc77a8ccd0
R13: 0000555556245810 R14: 00007ffc77a8bbd0 R15: 00000000000008d4
 </TASK>

Allocated by task 4076:
 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:436 [inline]
 __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:469
 kasan_slab_alloc include/linux/kasan.h:260 [inline]
 slab_post_alloc_hook mm/slab.h:741 [inline]
 slab_alloc_node mm/slub.c:3230 [inline]
 slab_alloc mm/slub.c:3238 [inline]
 kmem_cache_alloc+0x202/0x3a0 mm/slub.c:3243
 kmem_cache_zalloc include/linux/slab.h:705 [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:3113
 __do_sys_unshare kernel/fork.c:3184 [inline]
 __se_sys_unshare kernel/fork.c:3182 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3182
 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+0x44/0xae

The buggy address belongs to the object at ffff888077aa9a40
 which belongs to the cache net_namespace of size 6464
The buggy address is located 592 bytes inside of
 6464-byte region [ffff888077aa9a40, ffff888077aab380)
The buggy address belongs to the page:
page:ffffea0001deaa00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888077aa9a40 pfn:0x77aa8
head:ffffea0001deaa00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000122 ffff88814075e000
raw: ffff888077aa9a40 0000000080040003 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3607, ts 53305022650, free_ts 53303960926
 prep_new_page mm/page_alloc.c:2434 [inline]
 get_page_from_freelist+0xa72/0x2f40 mm/page_alloc.c:4165
 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5379
 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2271
 alloc_slab_page mm/slub.c:1799 [inline]
 allocate_slab mm/slub.c:1944 [inline]
 new_slab+0x28d/0x380 mm/slub.c:2004
 ___slab_alloc+0x6be/0xd60 mm/slub.c:3018
 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3105
 slab_alloc_node mm/slub.c:3196 [inline]
 slab_alloc mm/slub.c:3238 [inline]
 kmem_cache_alloc+0x35c/0x3a0 mm/slub.c:3243
 kmem_cache_zalloc include/linux/slab.h:705 [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:3113
 __do_sys_unshare kernel/fork.c:3184 [inline]
 __se_sys_unshare kernel/fork.c:3182 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3182
 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+0x44/0xae
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1352 [inline]
 free_pcp_prepare+0x414/0xb60 mm/page_alloc.c:1404
 free_unref_page_prepare mm/page_alloc.c:3325 [inline]
 free_unref_page+0x19/0x690 mm/page_alloc.c:3404
 skb_free_head net/core/skbuff.c:655 [inline]
 skb_release_data+0x716/0x860 net/core/skbuff.c:677
 skb_release_all net/core/skbuff.c:742 [inline]
 __kfree_skb net/core/skbuff.c:756 [inline]
 consume_skb net/core/skbuff.c:912 [inline]
 consume_skb+0xc2/0x160 net/core/skbuff.c:906
 skb_free_datagram+0x1b/0x1f0 net/core/datagram.c:325
 netlink_recvmsg+0x636/0xea0 net/netlink/af_netlink.c:1996
 sock_recvmsg_nosec net/socket.c:945 [inline]
 sock_recvmsg net/socket.c:963 [inline]
 sock_recvmsg net/socket.c:959 [inline]
 ____sys_recvmsg+0x2c4/0x600 net/socket.c:2629
 ___sys_recvmsg+0x127/0x200 net/socket.c:2671
 __sys_recvmsg+0xe2/0x1a0 net/socket.c:2701
 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+0x44/0xae

Memory state around the buggy address:
 ffff888077aa9b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888077aa9c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888077aa9c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                         ^
 ffff888077aa9d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888077aa9d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	e8 15 4d 13 fe       	callq  0xfe134d1a
   5:	e9 c9 fe ff ff       	jmpq   0xfffffed3
   a:	e8 eb 4c 13 fe       	callq  0xfe134cfa
   f:	e9 1f ff ff ff       	jmpq   0xffffff33
  14:	66 0f 1f 44 00 00    	nopw   0x0(%rax,%rax,1)
  1a:	41 57                	push   %r15
  1c:	41 56                	push   %r14
  1e:	41 55                	push   %r13
  20:	41 54                	push   %r12
  22:	49 89 f4             	mov    %rsi,%r12
  25:	55                   	push   %rbp
  26:	48 89 fd             	mov    %rdi,%rbp
  29:	53                   	push   %rbx
* 2a:	e8 cb 3e c8 fd       	callq  0xfdc83efa <-- trapping instruction
  2f:	48 8d 7d 28          	lea    0x28(%rbp),%rdi
  33:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  3a:	fc ff df
  3d:	48 89 fa             	mov    %rdi,%rdx