==================================================================
BUG: KASAN: use-after-free in inet_twsk_kill+0x358/0x3c0 net/ipv4/inet_timewait_sock.c:46
Read of size 8 at addr ffff8880189a39c0 by task syz-executor.3/6213

CPU: 0 PID: 6213 Comm: syz-executor.3 Not tainted 5.17.0-rc1-next-20220127-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+0xa5/0x3e0 mm/kasan/report.c:255
 __kasan_report mm/kasan/report.c:442 [inline]
 kasan_report.cold+0x83/0xdf mm/kasan/report.c:459
 inet_twsk_kill+0x358/0x3c0 net/ipv4/inet_timewait_sock.c:46
 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:check_kcov_mode kernel/kcov.c:166 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x7/0x60 kernel/kcov.c:200
Code: 4a 00 5d be 03 00 00 00 e9 66 b4 72 02 66 0f 1f 44 00 00 48 8b be b0 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 65 8b 05 b9 fe 89 7e <89> c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b 14 25 00 70 02 00 a9
RSP: 0018:ffffc9000373f6f8 EFLAGS: 00000217
RAX: 0000000080000000 RBX: 00000000fffffffe RCX: 0000000000000004
RDX: 0000000000000000 RSI: ffff888035f10000 RDI: 0000000000000003
RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff84105ec6 R11: 0000000000000000 R12: ffffc9000373facb
R13: ffffc9000373f79c R14: ffffc9008373fac2 R15: ffffc9000373faca
 number+0x6cf/0xae0 lib/vsprintf.c:556
 vsnprintf+0xf07/0x14f0 lib/vsprintf.c:2868
 sprintf+0xc0/0x100 lib/vsprintf.c:3004
 print_time kernel/printk/printk.c:1264 [inline]
 info_print_prefix+0x248/0x340 kernel/printk/printk.c:1290
 get_record_print_text_size+0x8c/0x110 kernel/printk/printk.c:1427
 find_first_fitting_seq+0x174/0x210 kernel/printk/printk.c:1475
 syslog_print_all+0x152/0x3b0 kernel/printk/printk.c:1593
 do_syslog.part.0+0x31f/0x640 kernel/printk/printk.c:1672
 do_syslog kernel/printk/printk.c:1748 [inline]
 __do_sys_syslog kernel/printk/printk.c:1750 [inline]
 __se_sys_syslog kernel/printk/printk.c:1748 [inline]
 __x64_sys_syslog+0x97/0xc0 kernel/printk/printk.c:1748
 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: 0033:0x7f7556c19059
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe1c1288e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000067
RAX: ffffffffffffffda RBX: 00007ffe1c128f28 RCX: 00007f7556c19059
RDX: 000000000000003f RSI: 00007ffe1c1289c0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007ffe1c157080 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000fffffff1
R13: 00007ffe1c1289c0 R14: 0000000000000000 R15: 0000000000000000
 </TASK>

Allocated by task 3630:
 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:732 [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:407 [inline]
 copy_net_ns+0x125/0x760 net/core/net_namespace.c:462
 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:3048
 __do_sys_unshare kernel/fork.c:3119 [inline]
 __se_sys_unshare kernel/fork.c:3117 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3117
 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 ffff8880189a3500
 which belongs to the cache net_namespace of size 6528
The buggy address is located 1216 bytes inside of
 6528-byte region [ffff8880189a3500, ffff8880189a4e80)
The buggy address belongs to the page:
page:ffffea0000626800 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880189a0000 pfn:0x189a0
head:ffffea0000626800 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000001 ffff8880118d5a00
raw: ffff8880189a0000 0000000080040001 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 3631, ts 204512892048, free_ts 191628226498
 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:5381
 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:407 [inline]
 copy_net_ns+0x125/0x760 net/core/net_namespace.c:462
 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:3048
 __do_sys_unshare kernel/fork.c:3119 [inline]
 __se_sys_unshare kernel/fork.c:3117 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3117
 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
 __put_page+0x1c1/0x2b0 mm/swap.c:128
 folio_put include/linux/mm.h:1199 [inline]
 put_page include/linux/mm.h:1237 [inline]
 __skb_frag_unref include/linux/skbuff.h:3179 [inline]
 skb_release_data+0x4a7/0x870 net/core/skbuff.c:672
 skb_release_all net/core/skbuff.c:742 [inline]
 __kfree_skb+0x46/0x60 net/core/skbuff.c:756
 tcp_eat_recv_skb+0x1ed/0x280 net/ipv4/tcp.c:1610
 tcp_recvmsg_locked+0x105c/0x1fd0 net/ipv4/tcp.c:2517
 tcp_recvmsg+0x137/0x610 net/ipv4/tcp.c:2563
 inet_recvmsg+0x11b/0x5e0 net/ipv4/af_inet.c:850
 sock_recvmsg_nosec net/socket.c:948 [inline]
 sock_recvmsg net/socket.c:966 [inline]
 sock_recvmsg net/socket.c:962 [inline]
 sock_read_iter+0x33c/0x470 net/socket.c:1039
 call_read_iter include/linux/fs.h:2068 [inline]
 new_sync_read+0x5c2/0x6e0 fs/read_write.c:401
 vfs_read+0x35c/0x600 fs/read_write.c:482
 ksys_read+0x1ee/0x250 fs/read_write.c:620
 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:
 ffff8880189a3880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880189a3900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880189a3980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff8880189a3a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880189a3a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	4a 00 5d be          	rex.WX add %bl,-0x42(%rbp)
   4:	03 00                	add    (%rax),%eax
   6:	00 00                	add    %al,(%rax)
   8:	e9 66 b4 72 02       	jmpq   0x272b473
   d:	66 0f 1f 44 00 00    	nopw   0x0(%rax,%rax,1)
  13:	48 8b be b0 01 00 00 	mov    0x1b0(%rsi),%rdi
  1a:	e8 b4 ff ff ff       	callq  0xffffffd3
  1f:	31 c0                	xor    %eax,%eax
  21:	c3                   	retq
  22:	90                   	nop
  23:	65 8b 05 b9 fe 89 7e 	mov    %gs:0x7e89feb9(%rip),%eax        # 0x7e89fee3
* 2a:	89 c1                	mov    %eax,%ecx <-- trapping instruction
  2c:	48 8b 34 24          	mov    (%rsp),%rsi
  30:	81 e1 00 01 00 00    	and    $0x100,%ecx
  36:	65 48 8b 14 25 00 70 	mov    %gs:0x27000,%rdx
  3d:	02 00
  3f:	a9                   	.byte 0xa9