==================================================================
BUG: KASAN: use-after-free in tcp_probe_timer net/ipv4/tcp_timer.c:378 [inline]
BUG: KASAN: use-after-free in tcp_write_timer_handler net/ipv4/tcp_timer.c:624 [inline]
BUG: KASAN: use-after-free in tcp_write_timer_handler+0x998/0x9f0 net/ipv4/tcp_timer.c:594
Read of size 1 at addr ffff88807a9186a5 by task syz-executor.0/3629

CPU: 0 PID: 3629 Comm: syz-executor.0 Not tainted 6.0.0-rc3-syzkaller-00154-g42b998d4aa59 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
Call Trace:
 <IRQ>
 __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_probe_timer net/ipv4/tcp_timer.c:378 [inline]
 tcp_write_timer_handler net/ipv4/tcp_timer.c:624 [inline]
 tcp_write_timer_handler+0x998/0x9f0 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+0x1d3/0x9c6 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:1106
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:core_kernel_text+0xa/0x90 kernel/extable.c:67
Code: a2 d0 02 48 85 c0 74 02 5d c3 48 89 ef e8 7e 3b 1a 00 48 85 c0 75 f1 48 89 ef 5d e9 a0 86 39 00 48 81 ff 00 00 00 81 41 54 53 <48> 89 fb 72 09 48 81 ff 80 7a c0 89 72 5b 48 89 df e8 60 a5 b0 ff
RSP: 0018:ffffc900044cf5c8 EFLAGS: 00000202
RAX: dffffc0000000000 RBX: ffffffff81d0b849 RCX: 0000000000000000
RDX: 1ffff92000899ecd RSI: ffffc900044cf830 RDI: ffffffff81d0b849
RBP: ffffffff81d0b849 R08: ffffffff8e69d226 R09: ffffc900044cf654
R10: fffff52000899ecf R11: ffffc900044cf848 R12: ffffc900044cf6d8
R13: 0000000000000000 R14: ffff88807a60d880 R15: 0000005ba829d27c
 kernel_text_address+0xd/0x80 kernel/extable.c:99
 __kernel_text_address+0x9/0x30 kernel/extable.c:79
 unwind_get_return_address arch/x86/kernel/unwind_orc.c:323 [inline]
 unwind_get_return_address+0x51/0x90 arch/x86/kernel/unwind_orc.c:318
 arch_stack_walk+0x93/0xe0 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:122
 save_stack+0x151/0x1e0 mm/page_owner.c:127
 __reset_page_owner+0x59/0x170 mm/page_owner.c:148
 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_list+0x16f/0xb90 mm/page_alloc.c:3522
 release_pages+0xbd3/0x1400 mm/swap.c:1012
 __pagevec_release+0x77/0x100 mm/swap.c:1032
 pagevec_release include/linux/pagevec.h:71 [inline]
 folio_batch_release include/linux/pagevec.h:135 [inline]
 truncate_inode_pages_range+0x318/0x1510 mm/truncate.c:373
 ext4_evict_inode+0x561/0x1d40 fs/ext4/inode.c:221
 evict+0x2ed/0x6b0 fs/inode.c:665
 iput_final fs/inode.c:1748 [inline]
 iput.part.0+0x55d/0x810 fs/inode.c:1774
 iput+0x58/0x70 fs/inode.c:1764
 do_unlinkat+0x41b/0x650 fs/namei.c:4304
 __do_sys_unlink fs/namei.c:4345 [inline]
 __se_sys_unlink fs/namei.c:4343 [inline]
 __x64_sys_unlink+0xc6/0x110 fs/namei.c:4343
 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
RIP: 0033:0x7ffa9a888bb7
Code: 73 01 c3 48 c7 c1 b8 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffea498cdd8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ffa9a888bb7
RDX: 00007ffea498ce10 RSI: 00007ffea498ce10 RDI: 00007ffea498cea0
RBP: 00007ffea498cea0 R08: 0000000000000001 R09: 00007ffea498cc70
R10: 00005555562e28b3 R11: 0000000000000206 R12: 00007ffa9a8e242e
R13: 00007ffea498df60 R14: 00005555562e2810 R15: 00007ffea498dfa0
 </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: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:3243 [inline]
 slab_alloc mm/slub.c:3251 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3258 [inline]
 kmem_cache_alloc+0x267/0x3b0 mm/slub.c:3268
 kmem_cache_zalloc include/linux/slab.h:723 [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:227
 ksys_unshare+0x445/0x920 kernel/fork.c:3183
 __do_sys_unshare kernel/fork.c:3254 [inline]
 __se_sys_unshare kernel/fork.c:3252 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3252
 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+0x625/0x1210 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+0x1d3/0x9c6 kernel/softirq.c:571

The buggy address belongs to the object at ffff88807a918000
 which belongs to the cache net_namespace of size 6784
The buggy address is located 1701 bytes inside of
 6784-byte region [ffff88807a918000, ffff88807a919a80)

The buggy address belongs to the physical page:
page:ffffea0001ea4600 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88807a918000 pfn:0x7a918
head:ffffea0001ea4600 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff88805381b041
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffff8880119db288 ffffea0001e6b008 ffff8881400073c0
raw: ffff88807a918000 0000000000040002 00000001ffffffff ffff88805381b041
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 3630, tgid 3630 (syz-executor.1), ts 93321384410, free_ts 93275306234
 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:5515
 alloc_pages+0x1a6/0x270 mm/mempolicy.c:2270
 alloc_slab_page mm/slub.c:1824 [inline]
 allocate_slab+0x27e/0x3d0 mm/slub.c:1969
 new_slab mm/slub.c:2029 [inline]
 ___slab_alloc+0x7f1/0xe10 mm/slub.c:3031
 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3118
 slab_alloc_node mm/slub.c:3209 [inline]
 slab_alloc mm/slub.c:3251 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3258 [inline]
 kmem_cache_alloc+0x38c/0x3b0 mm/slub.c:3268
 kmem_cache_zalloc include/linux/slab.h:723 [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:227
 ksys_unshare+0x445/0x920 kernel/fork.c:3183
 __do_sys_unshare kernel/fork.c:3254 [inline]
 __se_sys_unshare kernel/fork.c:3252 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3252
 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:2548
 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:3243 [inline]
 kmem_cache_alloc_node+0x2b1/0x3f0 mm/slub.c:3293
 __alloc_skb+0x210/0x2f0 net/core/skbuff.c:418
 alloc_skb include/linux/skbuff.h:1257 [inline]
 netlink_alloc_large_skb net/netlink/af_netlink.c:1191 [inline]
 netlink_sendmsg+0x9a2/0xe10 net/netlink/af_netlink.c:1896
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:734
 ____sys_sendmsg+0x6eb/0x810 net/socket.c:2482
 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2536
 __sys_sendmsg+0xf3/0x1c0 net/socket.c:2565
 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

Memory state around the buggy address:
 ffff88807a918580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88807a918600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807a918680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                               ^
 ffff88807a918700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88807a918780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	a2 d0 02 48 85 c0 74 	movabs %al,0x5d0274c0854802d0
   7:	02 5d
   9:	c3                   	retq
   a:	48 89 ef             	mov    %rbp,%rdi
   d:	e8 7e 3b 1a 00       	callq  0x1a3b90
  12:	48 85 c0             	test   %rax,%rax
  15:	75 f1                	jne    0x8
  17:	48 89 ef             	mov    %rbp,%rdi
  1a:	5d                   	pop    %rbp
  1b:	e9 a0 86 39 00       	jmpq   0x3986c0
  20:	48 81 ff 00 00 00 81 	cmp    $0xffffffff81000000,%rdi
  27:	41 54                	push   %r12
  29:	53                   	push   %rbx
* 2a:	48 89 fb             	mov    %rdi,%rbx <-- trapping instruction
  2d:	72 09                	jb     0x38
  2f:	48 81 ff 80 7a c0 89 	cmp    $0xffffffff89c07a80,%rdi
  36:	72 5b                	jb     0x93
  38:	48 89 df             	mov    %rbx,%rdi
  3b:	e8 60 a5 b0 ff       	callq  0xffb0a5a0