==================================================================
BUG: KASAN: use-after-free in tcp_retransmit_timer+0x2ef3/0x3360 net/ipv4/tcp_timer.c:511
Read of size 8 at addr ffff88804b0e5540 by task syz-executor.0/11398

CPU: 1 PID: 11398 Comm: syz-executor.0 Not tainted 5.18.0-rc3-syzkaller-01610-gac6a65868a5a #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+0xeb/0x495 mm/kasan/report.c:313
 print_report mm/kasan/report.c:429 [inline]
 kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491
 tcp_retransmit_timer+0x2ef3/0x3360 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+0x679/0xa80 kernel/time/timer.c:1737
 __run_timers kernel/time/timer.c:1715 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1750
 __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:645
RIP: 0010:mod_objcg_state+0x3db/0xa50 mm/memcontrol.c:3070
Code: c6 56 d9 cc 81 4c 89 e7 e8 92 be 90 ff 4d 85 ed 0f 85 c5 01 00 00 9c 58 f6 c4 02 0f 85 7f 03 00 00 4d 85 ed 74 01 fb 4d 85 ff <0f> 84 92 01 00 00 48 83 c4 28 4c 89 ff 5b 5d 41 5c 41 5d 41 5e 41
RSP: 0018:ffffc9000383f680 EFLAGS: 00000246
RAX: 0000000000000006 RBX: ffff8880b9d35f20 RCX: 1ffffffff200f4d6
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff8880b9d35f48 R08: 0000000000000001 R09: ffffffff900758cf
R10: 0000000000000001 R11: 0000000000000001 R12: ffff8880b9d35f20
R13: 0000000000000200 R14: ffff88813fffa000 R15: 0000000000000000
 memcg_slab_post_alloc_hook+0x1eb/0x480 mm/slab.h:540
 slab_post_alloc_hook mm/slab.h:756 [inline]
 slab_alloc_node mm/slub.c:3217 [inline]
 slab_alloc mm/slub.c:3225 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3232 [inline]
 kmem_cache_alloc_lru+0x272/0x720 mm/slub.c:3249
 alloc_inode_sb include/linux/fs.h:2966 [inline]
 sock_alloc_inode+0x23/0x1d0 net/socket.c:304
 alloc_inode+0x61/0x230 fs/inode.c:260
 new_inode_pseudo+0x14/0xe0 fs/inode.c:1018
 sock_alloc+0x3c/0x260 net/socket.c:627
 __sock_create+0xb9/0x790 net/socket.c:1432
 inet_ctl_sock_create+0x88/0x1d0 net/ipv4/af_inet.c:1647
 ndisc_net_init+0x7b/0x220 net/ipv6/ndisc.c:1946
 ops_init+0xaf/0x470 net/core/net_namespace.c:134
 setup_net+0x5d1/0xc50 net/core/net_namespace.c:325
 copy_net_ns+0x318/0x760 net/core/net_namespace.c:471
 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
 copy_namespaces+0x391/0x450 kernel/nsproxy.c:178
 copy_process+0x2f79/0x6fe0 kernel/fork.c:2237
 kernel_clone+0xe7/0xab0 kernel/fork.c:2639
 __do_sys_clone+0xc8/0x110 kernel/fork.c:2756
 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: 0033:0x7ff77e4890e9
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:00007ff77f65a118 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ff77e59bf60 RCX: 00007ff77e4890e9
RDX: 0000000020000380 RSI: 00000000200002c0 RDI: 00000000c0063400
RBP: 00007ff77e4e308d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007ffd7f64748f R14: 00007ff77f65a300 R15: 0000000000022000
 </TASK>

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:436 [inline]
 __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:469
 kasan_slab_alloc include/linux/kasan.h:224 [inline]
 slab_post_alloc_hook mm/slab.h:749 [inline]
 slab_alloc_node mm/slub.c:3217 [inline]
 slab_alloc mm/slub.c:3225 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3232 [inline]
 kmem_cache_alloc+0x204/0x3b0 mm/slub.c:3242
 kmem_cache_zalloc include/linux/slab.h:704 [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:3132
 __do_sys_unshare kernel/fork.c:3203 [inline]
 __se_sys_unshare kernel/fork.c:3201 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3201
 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

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+0x62e/0x1140 kernel/workqueue.c:1517
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
 expire_timers kernel/time/timer.c:1461 [inline]
 __run_timers.part.0+0x4a3/0xa80 kernel/time/timer.c:1737
 __run_timers kernel/time/timer.c:1715 [inline]
 run_timer_softirq+0x152/0x1d0 kernel/time/timer.c:1752
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558

The buggy address belongs to the object at ffff88804b0e5280
 which belongs to the cache net_namespace of size 6784
The buggy address is located 704 bytes inside of
 6784-byte region [ffff88804b0e5280, ffff88804b0e6d00)

The buggy address belongs to the physical page:
page:ffffea00012c3800 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88804b0e3700 pfn:0x4b0e0
head:ffffea00012c3800 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff88804b720941
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000001 ffff888010dcd3c0
raw: ffff88804b0e3700 0000000080040001 00000001ffffffff ffff88804b720941
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 3624, tgid 3624 (syz-executor.1), ts 100310801154, free_ts 11825920115
 prep_new_page mm/page_alloc.c:2441 [inline]
 get_page_from_freelist+0xba2/0x3e00 mm/page_alloc.c:4182
 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5408
 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2272
 alloc_slab_page mm/slub.c:1799 [inline]
 allocate_slab+0x26c/0x3c0 mm/slub.c:1944
 new_slab mm/slub.c:2004 [inline]
 ___slab_alloc+0x8df/0xf20 mm/slub.c:3005
 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3092
 slab_alloc_node mm/slub.c:3183 [inline]
 slab_alloc mm/slub.c:3225 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3232 [inline]
 kmem_cache_alloc+0x360/0x3b0 mm/slub.c:3242
 kmem_cache_zalloc include/linux/slab.h:704 [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:3132
 __do_sys_unshare kernel/fork.c:3203 [inline]
 __se_sys_unshare kernel/fork.c:3201 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3201
 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:1356 [inline]
 free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1406
 free_unref_page_prepare mm/page_alloc.c:3328 [inline]
 free_unref_page+0x19/0x6a0 mm/page_alloc.c:3423
 free_contig_range+0xb1/0x180 mm/page_alloc.c:9418
 destroy_args+0xa8/0x646 mm/debug_vm_pgtable.c:1018
 debug_vm_pgtable+0x2a51/0x2ae3 mm/debug_vm_pgtable.c:1332
 do_one_initcall+0x103/0x650 init/main.c:1298
 do_initcall_level init/main.c:1371 [inline]
 do_initcalls init/main.c:1387 [inline]
 do_basic_setup init/main.c:1406 [inline]
 kernel_init_freeable+0x6b1/0x73a init/main.c:1613
 kernel_init+0x1a/0x1d0 init/main.c:1502
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

Memory state around the buggy address:
 ffff88804b0e5400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88804b0e5480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88804b0e5500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff88804b0e5580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88804b0e5600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	56                   	push   %rsi
   1:	d9 cc                	fxch   %st(4)
   3:	81 4c 89 e7 e8 92 be 	orl    $0x90be92e8,-0x19(%rcx,%rcx,4)
   a:	90
   b:	ff 4d 85             	decl   -0x7b(%rbp)
   e:	ed                   	in     (%dx),%eax
   f:	0f 85 c5 01 00 00    	jne    0x1da
  15:	9c                   	pushfq
  16:	58                   	pop    %rax
  17:	f6 c4 02             	test   $0x2,%ah
  1a:	0f 85 7f 03 00 00    	jne    0x39f
  20:	4d 85 ed             	test   %r13,%r13
  23:	74 01                	je     0x26
  25:	fb                   	sti
  26:	4d 85 ff             	test   %r15,%r15
* 29:	0f 84 92 01 00 00    	je     0x1c1 <-- trapping instruction
  2f:	48 83 c4 28          	add    $0x28,%rsp
  33:	4c 89 ff             	mov    %r15,%rdi
  36:	5b                   	pop    %rbx
  37:	5d                   	pop    %rbp
  38:	41 5c                	pop    %r12
  3a:	41 5d                	pop    %r13
  3c:	41 5e                	pop    %r14
  3e:	41                   	rex.B