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BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x471/0x4b0
Read of size 2 at addr ffff888023dac42a by task syz.0.4410/21642

CPU: 1 UID: 0 PID: 21642 Comm: syz.0.4410 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <IRQ>
 dump_stack_lvl+0x189/0x250
 print_report+0xca/0x240
 kasan_report+0x118/0x150
 rose_timer_expiry+0x471/0x4b0
 call_timer_fn+0x17e/0x5f0
 __run_timer_base+0x61a/0x860
 run_timer_softirq+0xb7/0x180
 handle_softirqs+0x286/0x870
 __irq_exit_rcu+0xca/0x1f0
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:finish_task_switch+0x26b/0x950
Code: 0f 84 3c 01 00 00 48 85 db 0f 85 63 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 7f 56 eb 09 e8 2a 3e 36 00 fb 4c 8b 65 c0 <49> 8d bc 24 18 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0
RSP: 0018:ffffc90002e0f938 EFLAGS: 00000282
RAX: 77631910b325cb00 RBX: 0000000000000000 RCX: 77631910b325cb00
RDX: 0000000000000000 RSI: ffffffff8be33660 RDI: ffffffff81911696
RBP: ffffc90002e0f990 R08: ffffffff8fa38637 R09: 1ffffffff1f470c6
R10: dffffc0000000000 R11: fffffbfff1f470c7 R12: ffff8880285d5640
R13: dffffc0000000000 R14: ffff8881000f8000 R15: ffff88813663ab58
 __schedule+0x17a0/0x4cc0
 schedule+0x165/0x360
 do_nanosleep+0x1c7/0x600
 hrtimer_nanosleep+0x169/0x360
 __se_sys_clock_nanosleep+0x2f1/0x380
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f51f7fc14a5
Code: 24 0c 89 3c 24 48 89 4c 24 18 e8 f6 54 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 04 24 e8 4f 55 ff ff 48 8b 04 24 48 83 c4 28 f7 d8
RSP: 002b:00007ffe7e9ed010 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 00007f51f81b5fa0 RCX: 00007f51f7fc14a5
RDX: 00007ffe7e9ed050 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f51f81b7da0 R08: 0000000000000000 R09: 7fffffffffffffff
R10: 0000000000000000 R11: 0000000000000293 R12: 000000000003bdef
R13: 00007f51f81b6180 R14: ffffffffffffffff R15: 00007ffe7e9ed190
 </TASK>

Allocated by task 5843:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_node_noprof+0x276/0x4e0
 allocate_slab+0x16a/0x370
 ___slab_alloc+0xbeb/0x1410
 kmem_cache_alloc_noprof+0x283/0x3c0
 __send_signal_locked+0x22a/0xeb0
 group_send_sig_info+0x1fd/0x260
 do_bpf_send_signal+0xa9/0x1c0
 irq_work_single+0xe1/0x240
 irq_work_run+0x155/0x2f0
 __sysvec_irq_work+0xa8/0x3d0
 sysvec_irq_work+0x9e/0xc0
 asm_sysvec_irq_work+0x1a/0x20

Freed by task 5292:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5b/0x80
 kfree+0x18e/0x440
 __free_slab+0xb0/0x1a0
 __put_partials+0x156/0x1a0
 put_cpu_partial+0x17c/0x250
 __slab_free+0x2d5/0x3c0
 qlist_free_all+0x97/0x140
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 kmem_cache_alloc_noprof+0x1c1/0x3c0
 getname_flags+0xb8/0x540
 do_sys_openat2+0xbc/0x1c0
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888023dac400
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
 freed 512-byte region [ffff888023dac400, ffff888023dac600)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888023dac000 pfn:0x23dac
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000240 ffff88801a441c80 ffffea0000a60510 ffffea0000bf9510
raw: ffff888023dac000 0000000000100006 00000000f5000000 0000000000000000
head: 00fff00000000240 ffff88801a441c80 ffffea0000a60510 ffffea0000bf9510
head: ffff888023dac000 0000000000100006 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea00008f6b01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6672, tgid 6671 (syz.2.192), ts 57675795340, free_ts 55015796265
 post_alloc_hook+0x240/0x2a0
 get_page_from_freelist+0x21e4/0x22c0
 __alloc_frozen_pages_noprof+0x181/0x370
 alloc_pages_mpol+0x232/0x4a0
 allocate_slab+0x8a/0x370
 ___slab_alloc+0xbeb/0x1410
 __kmalloc_cache_noprof+0x296/0x3d0
 rxrpc_alloc_peer+0x7d/0x330
 rxrpc_service_prealloc_one+0x1f4/0xe20
 afs_charge_preallocation+0x394/0x4e0
 afs_open_socket+0x302/0x3a0
 afs_net_init+0x67d/0x880
 ops_init+0x35c/0x5c0
 setup_net+0x10c/0x320
 copy_net_ns+0x31b/0x4d0
 create_new_namespaces+0x3f3/0x720
page last free pid 6469 tgid 6468 stack trace:
 __free_frozen_pages+0xbc4/0xd30
 stack_depot_save_flags+0x436/0x860
 kasan_save_track+0x4f/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_node_noprof+0x276/0x4e0
 crypto_create_tfm_node+0x83/0x3f0
 crypto_alloc_tfm_node+0x172/0x3f0
 tls_set_sw_offload+0xa37/0x17d0
 tls_setsockopt+0xc8b/0x1340
 do_sock_setsockopt+0x17c/0x1b0
 __x64_sys_setsockopt+0x13f/0x1b0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888023dac300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888023dac380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888023dac400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff888023dac480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888023dac500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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