==================================================================
BUG: KASAN: use-after-free in do_shrink_slab+0xb15/0xbd0 mm/vmscan.c:774
Read of size 8 at addr ffff88801de285b8 by task rm/19392

CPU: 3 PID: 19392 Comm: rm Not tainted 6.0.0-syzkaller-09413-g4899a36f91a9 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Call Trace:
 <TASK>
 __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
 do_shrink_slab+0xb15/0xbd0 mm/vmscan.c:774
 shrink_slab+0x17c/0x6f0 mm/vmscan.c:991
 shrink_node_memcgs mm/vmscan.c:3182 [inline]
 shrink_node+0x8c9/0x1e80 mm/vmscan.c:3304
 shrink_zones mm/vmscan.c:3542 [inline]
 do_try_to_free_pages+0x3b4/0x17a0 mm/vmscan.c:3601
 try_to_free_pages+0x2a7/0x840 mm/vmscan.c:3836
 __perform_reclaim mm/page_alloc.c:4750 [inline]
 __alloc_pages_direct_reclaim mm/page_alloc.c:4772 [inline]
 __alloc_pages_slowpath.constprop.0+0x88a/0x2300 mm/page_alloc.c:5177
 __alloc_pages+0x43d/0x510 mm/page_alloc.c:5562
 alloc_pages+0x1a6/0x270 mm/mempolicy.c:2270
 folio_alloc+0x1c/0x70 mm/mempolicy.c:2280
 filemap_alloc_folio+0x306/0x3a0 mm/filemap.c:970
 page_cache_ra_unbounded+0x1aa/0x5e0 mm/readahead.c:248
 do_page_cache_ra mm/readahead.c:300 [inline]
 page_cache_ra_order+0x6e8/0xa00 mm/readahead.c:560
 do_sync_mmap_readahead mm/filemap.c:3035 [inline]
 filemap_fault+0x1669/0x2640 mm/filemap.c:3127
 __do_fault+0x10d/0x610 mm/memory.c:4173
 do_read_fault mm/memory.c:4524 [inline]
 do_fault mm/memory.c:4653 [inline]
 handle_pte_fault mm/memory.c:4917 [inline]
 __handle_mm_fault+0x2130/0x39b0 mm/memory.c:5059
 handle_mm_fault+0x1c8/0x780 mm/memory.c:5157
 do_user_addr_fault+0x475/0x1210 arch/x86/mm/fault.c:1407
 handle_page_fault arch/x86/mm/fault.c:1498 [inline]
 exc_page_fault+0x94/0x170 arch/x86/mm/fault.c:1554
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0033:0x7feb87063000
Code: Unable to access opcode bytes at 0x7feb87062fd6.
RSP: 002b:00007ffca23060a8 EFLAGS: 00010206
RAX: 00007feb87063000 RBX: 00007feb8731ff00 RCX: 00007ffca2306148
RDX: 00007ffca2306148 RSI: 00007ffca2306128 RDI: 0000000000000003
RBP: 0000000000000003 R08: 0000000000000007 R09: 0000000000000000
R10: 00007ffca2305fd0 R11: 0000000000000246 R12: 00007ffca2306128
R13: 00007ffca2306148 R14: 00007feb873531e0 R15: 0000000000000000
 </TASK>

Allocated by task 19396:
 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_kmalloc mm/kasan/common.c:516 [inline]
 ____kasan_kmalloc mm/kasan/common.c:475 [inline]
 __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:525
 kmalloc include/linux/slab.h:605 [inline]
 kzalloc include/linux/slab.h:733 [inline]
 ops_init+0xfb/0x470 net/core/net_namespace.c:124
 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+0x304d/0x7090 kernel/fork.c:2257
 kernel_clone+0xe7/0xab0 kernel/fork.c:2671
 __do_compat_sys_ia32_clone+0x9e/0xd0 arch/x86/kernel/sys_ia32.c:254
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

Freed by task 19396:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 kasan_set_track+0x21/0x30 mm/kasan/common.c:45
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
 ____kasan_slab_free mm/kasan/common.c:367 [inline]
 ____kasan_slab_free+0x166/0x1c0 mm/kasan/common.c:329
 kasan_slab_free include/linux/kasan.h:200 [inline]
 slab_free_hook mm/slub.c:1759 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1785
 slab_free mm/slub.c:3539 [inline]
 kfree+0xe2/0x580 mm/slub.c:4567
 ops_init+0xcd/0x470 net/core/net_namespace.c:139
 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+0x304d/0x7090 kernel/fork.c:2257
 kernel_clone+0xe7/0xab0 kernel/fork.c:2671
 __do_compat_sys_ia32_clone+0x9e/0xd0 arch/x86/kernel/sys_ia32.c:254
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

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
 call_rcu+0x99/0x790 kernel/rcu/tree.c:2796
 netlink_release+0xeff/0x1db0 net/netlink/af_netlink.c:815
 __sock_release+0xcd/0x280 net/socket.c:650
 sock_close+0x18/0x20 net/socket.c:1365
 __fput+0x27c/0xa90 fs/file_table.c:320
 task_work_run+0xdd/0x1a0 kernel/task_work.c:177
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0xad5/0x29b0 kernel/exit.c:795
 do_group_exit+0xd2/0x2f0 kernel/exit.c:925
 __do_sys_exit_group kernel/exit.c:936 [inline]
 __se_sys_exit_group kernel/exit.c:934 [inline]
 __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:934
 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

Second to 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
 call_rcu+0x99/0x790 kernel/rcu/tree.c:2796
 netlink_release+0xeff/0x1db0 net/netlink/af_netlink.c:815
 __sock_release net/socket.c:650 [inline]
 sock_release+0x87/0x1b0 net/socket.c:678
 netlink_kernel_release+0x4b/0x60 net/netlink/af_netlink.c:2107
 rtnetlink_net_exit+0x34/0x70 net/core/rtnetlink.c:6176
 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:162
 setup_net+0x7fb/0xc50 net/core/net_namespace.c:348
 copy_net_ns+0x318/0x760 net/core/net_namespace.c:471
 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:3181
 __do_sys_unshare kernel/fork.c:3252 [inline]
 __se_sys_unshare kernel/fork.c:3250 [inline]
 __ia32_sys_unshare+0x2c/0x40 kernel/fork.c:3250
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

The buggy address belongs to the object at ffff88801de28000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1464 bytes inside of
 2048-byte region [ffff88801de28000, ffff88801de28800)

The buggy address belongs to the physical page:
page:ffffea0000778a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1de28
head:ffffea0000778a00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0000710400 dead000000000002 ffff888011842f00
raw: 0000000000000000 0000000000080008 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 3749, tgid 3749 (kworker/2:3), ts 182271609333, free_ts 62841087869
 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:5549
 alloc_pages+0x1a6/0x270 mm/mempolicy.c:2270
 alloc_slab_page mm/slub.c:1829 [inline]
 allocate_slab+0x27e/0x3d0 mm/slub.c:1974
 new_slab mm/slub.c:2034 [inline]
 ___slab_alloc+0x84f/0xe80 mm/slub.c:3036
 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3123
 slab_alloc_node mm/slub.c:3214 [inline]
 __kmalloc_node_track_caller+0x2f1/0x390 mm/slub.c:4964
 kmalloc_reserve net/core/skbuff.c:437 [inline]
 __alloc_skb+0xd9/0x2f0 net/core/skbuff.c:509
 alloc_skb include/linux/skbuff.h:1265 [inline]
 alloc_skb_with_frags+0x93/0x6c0 net/core/skbuff.c:6124
 sock_alloc_send_pskb+0x7a3/0x930 net/core/sock.c:2719
 sock_alloc_send_skb include/net/sock.h:1884 [inline]
 mld_newpack.isra.0+0x1b9/0x770 net/ipv6/mcast.c:1748
 add_grhead+0x295/0x340 net/ipv6/mcast.c:1851
 add_grec+0x1082/0x1560 net/ipv6/mcast.c:1989
 mld_send_cr net/ipv6/mcast.c:2115 [inline]
 mld_ifc_work+0x452/0xdc0 net/ipv6/mcast.c:2653
 process_one_work+0x991/0x1610 kernel/workqueue.c:2289
 worker_thread+0x665/0x1080 kernel/workqueue.c:2436
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
 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:3248 [inline]
 kmem_cache_alloc_node+0x2b1/0x3f0 mm/slub.c:3298
 __alloc_skb+0x210/0x2f0 net/core/skbuff.c:497
 alloc_skb_fclone include/linux/skbuff.h:1315 [inline]
 tcp_stream_alloc_skb+0x38/0x580 net/ipv4/tcp.c:861
 tcp_sendmsg_locked+0xc4b/0x2940 net/ipv4/tcp.c:1324
 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1482
 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:819
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:734
 sock_write_iter+0x291/0x3d0 net/socket.c:1108
 call_write_iter include/linux/fs.h:2190 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x9e9/0xdd0 fs/read_write.c:584
 ksys_write+0x1e8/0x250 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80

Memory state around the buggy address:
 ffff88801de28480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88801de28500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88801de28580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                        ^
 ffff88801de28600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88801de28680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================