syzbot

==================================================================
BUG: KASAN: use-after-free in rht_key_hashfn include/linux/rhashtable.h:159 [inline]
BUG: KASAN: use-after-free in __rhashtable_lookup include/linux/rhashtable.h:604 [inline]
BUG: KASAN: use-after-free in rhashtable_lookup include/linux/rhashtable.h:646 [inline]
BUG: KASAN: use-after-free in rhashtable_lookup_fast+0x77a/0x9b0 include/linux/rhashtable.h:672
Read of size 4 at addr ffff888068fe8008 by task syz.4.2288/11617

CPU: 1 PID: 11617 Comm: syz.4.2288 Not tainted 6.10.0-syzkaller-04483-g0be9ae5486cd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 rht_key_hashfn include/linux/rhashtable.h:159 [inline]
 __rhashtable_lookup include/linux/rhashtable.h:604 [inline]
 rhashtable_lookup include/linux/rhashtable.h:646 [inline]
 rhashtable_lookup_fast+0x77a/0x9b0 include/linux/rhashtable.h:672
 ila_lookup_wildcards net/ipv6/ila/ila_xlat.c:132 [inline]
 ila_xlat_addr net/ipv6/ila/ila_xlat.c:652 [inline]
 ila_nf_input+0x1fe/0x3c0 net/ipv6/ila/ila_xlat.c:190
 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
 nf_hook_slow+0xc3/0x220 net/netfilter/core.c:626
 nf_hook include/linux/netfilter.h:269 [inline]
 NF_HOOK+0x29e/0x450 include/linux/netfilter.h:312
 __netif_receive_skb_one_core net/core/dev.c:5660 [inline]
 __netif_receive_skb+0x1ea/0x650 net/core/dev.c:5774
 process_backlog+0x662/0x15b0 net/core/dev.c:6107
 __napi_poll+0xcb/0x490 net/core/dev.c:6771
 napi_poll net/core/dev.c:6840 [inline]
 net_rx_action+0x89b/0x1240 net/core/dev.c:6962
 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554
 __do_softirq kernel/softirq.c:588 [inline]
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:preempt_schedule_irq+0xf6/0x1c0 kernel/sched/core.c:6851
Code: 89 f5 49 c1 ed 03 eb 0d 48 f7 03 08 00 00 00 0f 84 8b 00 00 00 bf 01 00 00 00 e8 25 59 d0 f5 e8 00 57 08 f6 fb bf 01 00 00 00 <e8> 55 ad ff ff 43 80 7c 3d 00 00 74 08 4c 89 f7 e8 25 29 67 f6 48
RSP: 0018:ffffc90002d4f280 EFLAGS: 00000282
RAX: cde7e63586631000 RBX: 1ffff920005a9e58 RCX: ffffffff8173011a
RDX: dffffc0000000000 RSI: ffffffff8bcac920 RDI: 0000000000000001
RBP: ffffc90002d4f340 R08: ffffffff92fcf65f R09: 1ffffffff25f9ecb
R10: dffffc0000000000 R11: fffffbfff25f9ecc R12: 1ffff920005a9e50
R13: 1ffff920005a9e54 R14: ffffc90002d4f2a0 R15: dffffc0000000000
 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:slab_obj_exts mm/slab.h:548 [inline]
RIP: 0010:__memcg_slab_post_alloc_hook+0x45c/0x7e0 mm/memcontrol.c:3780
Code: 83 f8 20 0f 83 c1 01 00 00 89 d1 41 d3 ed 45 89 ef be 01 00 00 00 48 8b 7c 24 10 e8 0e b2 00 00 48 b8 00 00 00 00 00 fc ff df <80> 3c 03 00 74 08 4c 89 e7 e8 46 f7 f7 ff 49 8b 04 24 48 85 c0 4c
RSP: 0018:ffffc90002d4f408 EFLAGS: 00000287
RAX: dffffc0000000000 RBX: 1ffffd4000329cc7 RCX: ffffc90002d4f303
RDX: 0000000000000001 RSI: ffffffff8bcadaa0 RDI: ffffffff8c2045a0
RBP: 0000000000000ac0 R08: ffffffff8fae37af R09: 1ffffffff1f5c6f5
R10: dffffc0000000000 R11: fffffbfff1f5c6f6 R12: ffffea000194e638
R13: 0000000000000004 R14: ffffea000194e600 R15: 0000000000000004
 memcg_slab_post_alloc_hook mm/slub.c:2104 [inline]
 slab_post_alloc_hook mm/slub.c:3963 [inline]
 slab_alloc_node mm/slub.c:4002 [inline]
 kmem_cache_alloc_lru_noprof+0x1e6/0x2b0 mm/slub.c:4021
 proc_alloc_inode+0x2a/0xc0 fs/proc/inode.c:57
 alloc_inode fs/inode.c:263 [inline]
 new_inode_pseudo fs/inode.c:1028 [inline]
 new_inode+0x6e/0x310 fs/inode.c:1047
 proc_get_inode+0x22/0x660 fs/proc/inode.c:646
 proc_lookup_de+0x24e/0x300 fs/proc/generic.c:253
 __lookup_slow+0x28c/0x3f0 fs/namei.c:1718
 lookup_slow+0x53/0x70 fs/namei.c:1735
 walk_component fs/namei.c:2039 [inline]
 link_path_walk+0x99b/0xea0 fs/namei.c:2404
 path_lookupat+0xa9/0x450 fs/namei.c:2565
 do_o_path+0x95/0x230 fs/namei.c:3857
 path_openat+0x2d90/0x3470 fs/namei.c:3879
 do_filp_open+0x235/0x490 fs/namei.c:3913
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1416
 do_sys_open fs/open.c:1431 [inline]
 __do_sys_openat fs/open.c:1447 [inline]
 __se_sys_openat fs/open.c:1442 [inline]
 __x64_sys_openat+0x247/0x2a0 fs/open.c:1442
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc56c775b59
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc56d545048 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fc56c905f60 RCX: 00007fc56c775b59
RDX: 0000000000200002 RSI: 0000000020000000 RDI: ffffffffffffff9c
RBP: 00007fc56c7e4e5d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fc56c905f60 R15: 00007ffd1a0c1a48
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x68fe8
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffff7f(buddy)
raw: 00fff00000000000 ffffea0001629408 ffffea0000ba1e08 0000000000000000
raw: 0000000000000000 0000000000000003 00000000ffffff7f 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x52dc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_ZERO), pid 5097, tgid 5097 (syz-executor), ts 72961949866, free_ts 296416587781
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1473
 prep_new_page mm/page_alloc.c:1481 [inline]
 get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3425
 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4683
 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
 alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
 __kmalloc_large_node+0x8b/0x1d0 mm/slub.c:4068
 __do_kmalloc_node mm/slub.c:4111 [inline]
 __kmalloc_node_noprof+0x2d2/0x440 mm/slub.c:4130
 kmalloc_node_noprof include/linux/slab.h:681 [inline]
 kvmalloc_node_noprof+0x72/0x190 mm/util.c:639
 bucket_table_alloc lib/rhashtable.c:186 [inline]
 rhashtable_init_noprof+0x534/0xa60 lib/rhashtable.c:1071
 ila_xlat_init_net+0xa0/0x110 net/ipv6/ila/ila_xlat.c:613
 ops_init+0x359/0x610 net/core/net_namespace.c:139
 setup_net+0x515/0xca0 net/core/net_namespace.c:343
 copy_net_ns+0x4e2/0x7b0 net/core/net_namespace.c:508
 create_new_namespaces+0x425/0x7b0 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x124/0x180 kernel/nsproxy.c:228
 ksys_unshare+0x619/0xc10 kernel/fork.c:3308
 __do_sys_unshare kernel/fork.c:3379 [inline]
 __se_sys_unshare kernel/fork.c:3377 [inline]
 __x64_sys_unshare+0x38/0x40 kernel/fork.c:3377
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
page last free pid 35 tgid 35 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1093 [inline]
 free_unref_page+0xd22/0xea0 mm/page_alloc.c:2588
 __folio_put+0x3b9/0x620 mm/swap.c:129
 folio_put include/linux/mm.h:1513 [inline]
 free_large_kmalloc+0x105/0x1c0 mm/slub.c:4530
 kfree+0x1c4/0x360 mm/slub.c:4553
 rhashtable_free_and_destroy+0x7c6/0x920 lib/rhashtable.c:1169
 ila_xlat_exit_net+0x55/0x110 net/ipv6/ila/ila_xlat.c:626
 ops_exit_list net/core/net_namespace.c:173 [inline]
 cleanup_net+0x802/0xcc0 net/core/net_namespace.c:640
 process_one_work kernel/workqueue.c:3231 [inline]
 process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
 worker_thread+0x86d/0xd40 kernel/workqueue.c:3390
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Memory state around the buggy address:
 ffff888068fe7f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888068fe7f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888068fe8000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                      ^
 ffff888068fe8080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888068fe8100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
----------------
Code disassembly (best guess):
   0:	89 f5                	mov    %esi,%ebp
   2:	49 c1 ed 03          	shr    $0x3,%r13
   6:	eb 0d                	jmp    0x15
   8:	48 f7 03 08 00 00 00 	testq  $0x8,(%rbx)
   f:	0f 84 8b 00 00 00    	je     0xa0
  15:	bf 01 00 00 00       	mov    $0x1,%edi
  1a:	e8 25 59 d0 f5       	call   0xf5d05944
  1f:	e8 00 57 08 f6       	call   0xf6085724
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
* 2a:	e8 55 ad ff ff       	call   0xffffad84 <-- trapping instruction
  2f:	43 80 7c 3d 00 00    	cmpb   $0x0,0x0(%r13,%r15,1)
  35:	74 08                	je     0x3f
  37:	4c 89 f7             	mov    %r14,%rdi
  3a:	e8 25 29 67 f6       	call   0xf6672964
  3f:	48                   	rex.W