==================================================================
BUG: KASAN: use-after-free in tcp_retransmit_timer+0x6ee/0x2890 net/ipv4/tcp_timer.c:515
Read of size 8 at addr ffff888058a8d118 by task syz-executor.1/6350

CPU: 1 PID: 6350 Comm: syz-executor.1 Not tainted 5.15.110-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
Call Trace:
 <IRQ>
 __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+0x6ee/0x2890 net/ipv4/tcp_timer.c:515
 tcp_write_timer_handler+0x1f7/0x9c0 net/ipv4/tcp_timer.c:626
 tcp_write_timer+0x12e/0x280 net/ipv4/tcp_timer.c:646
 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:636
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648
 sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:console_unlock+0xe53/0x12b0 kernel/printk/printk.c:2739
Code: 00 48 83 7c 24 18 00 75 19 e8 49 d7 19 00 eb 18 e8 42 d7 19 00 e8 4d 21 b4 08 48 83 7c 24 18 00 74 e7 e8 30 d7 19 00 fb 31 ff <44> 89 f6 e8 85 da 19 00 31 db 45 85 f6 0f 95 c0 89 c1 0a 4c 24 17
RSP: 0018:ffffc90002e2ea20 EFLAGS: 00000246
RAX: ffffffff81660750 RBX: 0000000000000000 RCX: ffff88801ed89d00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90002e2ecb0 R08: ffffffff8166071b R09: fffffbfff1f78c21
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffffffff1a49e3e
R13: ffffffff8d24f228 R14: 0000000000000000 R15: dffffc0000000000
 vprintk_emit+0xba/0x150 kernel/printk/printk.c:2268
 _printk+0xd1/0x111 kernel/printk/printk.c:2289
 mem_cgroup_print_oom_meminfo+0x1b0/0x2e0 mm/memcontrol.c:1590
 dump_header+0x10c/0x940 mm/oom_kill.c:465
 oom_kill_process+0xef/0x3d0 mm/oom_kill.c:1006
 out_of_memory+0xe97/0x1280 mm/oom_kill.c:1143
 mem_cgroup_out_of_memory+0x25f/0x3c0 mm/memcontrol.c:1643
 mem_cgroup_oom mm/memcontrol.c:1878 [inline]
 try_charge_memcg+0x101e/0x1530 mm/memcontrol.c:2699
 obj_cgroup_charge_pages+0xab/0x1d0 mm/memcontrol.c:3014
 obj_cgroup_charge+0x19e/0x390 mm/memcontrol.c:3295
 memcg_slab_pre_alloc_hook mm/slab.h:287 [inline]
 slab_pre_alloc_hook+0xa6/0xc0 mm/slab.h:497
 slab_alloc_node mm/slub.c:3134 [inline]
 slab_alloc mm/slub.c:3228 [inline]
 kmem_cache_alloc+0x3f/0x280 mm/slub.c:3233
 ext4_alloc_inode+0x1d/0x590 fs/ext4/super.c:1286
 alloc_inode fs/inode.c:236 [inline]
 iget_locked+0x194/0x7f0 fs/inode.c:1202
 __ext4_iget+0x25d/0x3e40 fs/ext4/inode.c:4625
 ext4_lookup+0x691/0xaa0 fs/ext4/namei.c:1835
 __lookup_slow+0x275/0x3d0 fs/namei.c:1659
 lookup_slow+0x53/0x70 fs/namei.c:1676
 walk_component+0x48c/0x610 fs/namei.c:1972
 lookup_last fs/namei.c:2427 [inline]
 path_lookupat+0x16f/0x450 fs/namei.c:2451
 filename_lookup+0x230/0x5c0 fs/namei.c:2480
 user_path_at_empty+0x40/0x180 fs/namei.c:2853
 user_path_at include/linux/namei.h:57 [inline]
 ksys_umount fs/namespace.c:1779 [inline]
 __do_sys_umount fs/namespace.c:1787 [inline]
 __se_sys_umount fs/namespace.c:1785 [inline]
 __x64_sys_umount+0xf0/0x170 fs/namespace.c:1785
 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
RIP: 0033:0x7f2b8ea8d5d7
Code: ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 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:00007ffdc32a4e38 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 000000000000000b RCX: 00007f2b8ea8d5d7
RDX: 00007ffdc32a4f0e RSI: 000000000000000a RDI: 00007ffdc32a4f00
RBP: 00007ffdc32a4f00 R08: 00000000ffffffff R09: 00007ffdc32a4cd0
R10: 0000555555b68853 R11: 0000000000000246 R12: 00007f2b8eae6cdc
R13: 00007ffdc32a5fc0 R14: 0000555555b68810 R15: 00007ffdc32a6000
 </TASK>

Allocated by task 4138:
 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:3094
 __do_sys_unshare kernel/fork.c:3168 [inline]
 __se_sys_unshare kernel/fork.c:3166 [inline]
 __x64_sys_unshare+0x34/0x40 kernel/fork.c:3166
 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 ffff888058a8cec0
 which belongs to the cache net_namespace of size 6464
The buggy address is located 600 bytes inside of
 6464-byte region [ffff888058a8cec0, ffff888058a8e800)
The buggy address belongs to the page:
page:ffffea000162a200 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888058a8cec0 pfn:0x58a88
head:ffffea000162a200 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff888016bcc041
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0001db0608 ffffea0001f08e08 ffff888011dc63c0
raw: ffff888058a8cec0 0000000000040000 00000001ffffffff ffff888016bcc041
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 3672, ts 80071624177, free_ts 15678032218
 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
 copy_namespaces+0x365/0x3b0 kernel/nsproxy.c:178
 copy_process+0x1841/0x3ef0 kernel/fork.c:2201
 kernel_clone+0x210/0x960 kernel/fork.c:2601
 __do_sys_clone kernel/fork.c:2718 [inline]
 __se_sys_clone kernel/fork.c:2702 [inline]
 __x64_sys_clone+0x23f/0x290 kernel/fork.c:2702
 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_contig_range+0x95/0xf0 mm/page_alloc.c:9340
 destroy_args+0xfe/0x97f mm/debug_vm_pgtable.c:1018
 debug_vm_pgtable+0x40d/0x462 mm/debug_vm_pgtable.c:1331
 do_one_initcall+0x22b/0x7a0 init/main.c:1306
 do_initcall_level+0x157/0x207 init/main.c:1379
 do_initcalls+0x49/0x86 init/main.c:1395
 kernel_init_freeable+0x43c/0x5c5 init/main.c:1619
 kernel_init+0x19/0x290 init/main.c:1510
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

Memory state around the buggy address:
 ffff888058a8d000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888058a8d080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888058a8d100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff888058a8d180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888058a8d200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	00 48 83             	add    %cl,-0x7d(%rax)
   3:	7c 24                	jl     0x29
   5:	18 00                	sbb    %al,(%rax)
   7:	75 19                	jne    0x22
   9:	e8 49 d7 19 00       	callq  0x19d757
   e:	eb 18                	jmp    0x28
  10:	e8 42 d7 19 00       	callq  0x19d757
  15:	e8 4d 21 b4 08       	callq  0x8b42167
  1a:	48 83 7c 24 18 00    	cmpq   $0x0,0x18(%rsp)
  20:	74 e7                	je     0x9
  22:	e8 30 d7 19 00       	callq  0x19d757
  27:	fb                   	sti
  28:	31 ff                	xor    %edi,%edi
* 2a:	44 89 f6             	mov    %r14d,%esi <-- trapping instruction
  2d:	e8 85 da 19 00       	callq  0x19dab7
  32:	31 db                	xor    %ebx,%ebx
  34:	45 85 f6             	test   %r14d,%r14d
  37:	0f 95 c0             	setne  %al
  3a:	89 c1                	mov    %eax,%ecx
  3c:	0a 4c 24 17          	or     0x17(%rsp),%cl