syzbot

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BUG: KASAN: slab-use-after-free in rxrpc_input_call_event+0x211f/0x2310 net/rxrpc/call_event.c:475
Read of size 8 at addr ffff88805a9e0f48 by task krxrpcio/0/7411

CPU: 0 UID: 0 PID: 7411 Comm: krxrpcio/0 Not tainted 6.15.0-syzkaller-10820-gcd2e103d57e5 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:408 [inline]
 print_report+0xcd/0x680 mm/kasan/report.c:521
 kasan_report+0xe0/0x110 mm/kasan/report.c:634
 rxrpc_input_call_event+0x211f/0x2310 net/rxrpc/call_event.c:475
 rxrpc_distribute_error net/rxrpc/peer_event.c:232 [inline]
 rxrpc_store_error net/rxrpc/peer_event.c:209 [inline]
 rxrpc_input_error+0x7d9/0xf20 net/rxrpc/peer_event.c:177
 rxrpc_io_thread+0x1412/0x4020 net/rxrpc/io_thread.c:488
 kthread+0x3c5/0x780 kernel/kthread.c:464
 ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Allocated by task 7409:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 unpoison_slab_object mm/kasan/common.c:319 [inline]
 __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:345
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4147 [inline]
 slab_alloc_node mm/slub.c:4196 [inline]
 kmem_cache_alloc_noprof+0x1cb/0x3b0 mm/slub.c:4203
 rxrpc_alloc_call+0x17b/0x1090 net/rxrpc/call_object.c:127
 rxrpc_alloc_client_call net/rxrpc/call_object.c:200 [inline]
 rxrpc_new_client_call+0x138/0x17c0 net/rxrpc/call_object.c:347
 rxrpc_new_client_call_for_sendmsg net/rxrpc/sendmsg.c:645 [inline]
 rxrpc_do_sendmsg+0xb16/0x15d0 net/rxrpc/sendmsg.c:695
 rxrpc_sendmsg+0x498/0x680 net/rxrpc/af_rxrpc.c:598
 sock_sendmsg_nosec net/socket.c:712 [inline]
 __sock_sendmsg net/socket.c:727 [inline]
 ____sys_sendmsg+0xa98/0xc70 net/socket.c:2566
 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2620
 __sys_sendmsg+0x16d/0x220 net/socket.c:2652
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 7409:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
 poison_slab_object mm/kasan/common.c:247 [inline]
 __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264
 kasan_slab_free include/linux/kasan.h:233 [inline]
 slab_free_hook mm/slub.c:2380 [inline]
 slab_free mm/slub.c:4642 [inline]
 kmem_cache_free+0x2d1/0x4d0 mm/slub.c:4744
 rxrpc_rcu_free_call+0x3e/0x90 net/rxrpc/call_object.c:679
 rcu_do_batch kernel/rcu/tree.c:2576 [inline]
 rcu_core+0x79c/0x14e0 kernel/rcu/tree.c:2832
 handle_softirqs+0x219/0x8e0 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1050
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702

Last potentially related work creation:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:548
 __call_rcu_common.constprop.0+0x9a/0x9f0 kernel/rcu/tree.c:3090
 rxrpc_cleanup_call+0x12f/0x1a0 net/rxrpc/call_object.c:722
 rxrpc_put_call+0x2a5/0x390 net/rxrpc/call_object.c:667
 rxrpc_input_call_event+0xfc8/0x2310 net/rxrpc/call_event.c:474
 rxrpc_distribute_error net/rxrpc/peer_event.c:232 [inline]
 rxrpc_store_error net/rxrpc/peer_event.c:209 [inline]
 rxrpc_input_error+0x7d9/0xf20 net/rxrpc/peer_event.c:177
 rxrpc_io_thread+0x1412/0x4020 net/rxrpc/io_thread.c:488
 kthread+0x3c5/0x780 kernel/kthread.c:464
 ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

The buggy address belongs to the object at ffff88805a9e0f00
 which belongs to the cache rxrpc_call_jar of size 1760
The buggy address is located 72 bytes inside of
 freed 1760-byte region [ffff88805a9e0f00, ffff88805a9e15e0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5a9e0
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88814b8fd000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080110011 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88814b8fd000 dead000000000122 0000000000000000
head: 0000000000000000 0000000080110011 00000000f5000000 0000000000000000
head: 00fff00000000003 ffffea00016a7801 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
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 6491, tgid 6490 (syz.3.126), ts 118297331787, free_ts 117839760044
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1704
 prep_new_page mm/page_alloc.c:1712 [inline]
 get_page_from_freelist+0x1321/0x3890 mm/page_alloc.c:3669
 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:4959
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2419
 alloc_slab_page mm/slub.c:2450 [inline]
 allocate_slab mm/slub.c:2618 [inline]
 new_slab+0x23b/0x330 mm/slub.c:2672
 ___slab_alloc+0xd9c/0x1940 mm/slub.c:3858
 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3948
 __slab_alloc_node mm/slub.c:4023 [inline]
 slab_alloc_node mm/slub.c:4184 [inline]
 kmem_cache_alloc_noprof+0xef/0x3b0 mm/slub.c:4203
 rxrpc_alloc_call+0x17b/0x1090 net/rxrpc/call_object.c:127
 rxrpc_service_prealloc_one+0x35d/0xfd0 net/rxrpc/call_accept.c:97
 rxrpc_kernel_charge_accept+0xcd/0x110 net/rxrpc/call_accept.c:474
 afs_charge_preallocation+0xc6/0x320 fs/afs/rxrpc.c:758
 afs_open_socket+0x323/0x400 fs/afs/rxrpc.c:112
 afs_net_init+0x825/0xb00 fs/afs/main.c:116
 ops_init+0x1df/0x5f0 net/core/net_namespace.c:138
 setup_net+0x1ff/0x510 net/core/net_namespace.c:442
page last free pid 2 tgid 2 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1248 [inline]
 __free_frozen_pages+0x7fe/0x1180 mm/page_alloc.c:2706
 discard_slab mm/slub.c:2716 [inline]
 __put_partials+0x16d/0x1c0 mm/slub.c:3185
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x4d/0x120 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4147 [inline]
 slab_alloc_node mm/slub.c:4196 [inline]
 kmem_cache_alloc_node_noprof+0x1d5/0x3b0 mm/slub.c:4248
 alloc_task_struct_node kernel/fork.c:183 [inline]
 dup_task_struct kernel/fork.c:869 [inline]
 copy_process+0x4b6/0x76a0 kernel/fork.c:1999
 kernel_clone+0xfc/0x960 kernel/fork.c:2599
 kernel_thread+0xd4/0x120 kernel/fork.c:2661
 create_kthread kernel/kthread.c:487 [inline]
 kthreadd+0x503/0x800 kernel/kthread.c:847
 ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Memory state around the buggy address:
 ffff88805a9e0e00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff88805a9e0e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88805a9e0f00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                              ^
 ffff88805a9e0f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88805a9e1000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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