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BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x471/0x4b0
Read of size 2 at addr ffff88811f54182a by task modprobe/2275

CPU: 1 UID: 0 PID: 2275 Comm: modprobe Not tainted 6.16.0-syzkaller-06574-gd9104cec3e8f-dirty #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:do_syscall_64+0xc3/0x3b0
Code: 00 48 8b 7d 08 48 89 7b 18 e8 49 5a 00 00 0f 1f 44 00 00 0f 1f 44 00 00 90 e8 19 bd 57 f6 90 90 e8 c2 bc 57 f6 fb 49 8b 57 08 <f6> c2 3f 74 0e 4c 89 f7 4c 89 ee e8 bd c4 3a f6 49 89 c4 90 90 41
RSP: 0018:ffffc9002a44fef0 EFLAGS: 00000286
RAX: f7c6a13f2d985000 RBX: ffffc9002a44fef0 RCX: f7c6a13f2d985000
RDX: 0000000000000000 RSI: ffffffff8d97923a RDI: ffffffff8be30a00
RBP: ffffc9002a44ff48 R08: ffffffff8fa07af7 R09: 1ffffffff1f40f5e
R10: dffffc0000000000 R11: fffffbfff1f40f5f R12: 0000000000000011
R13: 0000000000000011 R14: ffffc9002a44ff58 R15: ffff888107ce8000
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f47177eda7e
Code: 01 00 48 83 c8 ff c3 31 c0 0f 05 48 3d 00 f0 ff ff 76 0c f7 d8 89 05 f1 47 01 00 48 83 c8 ff c3 49 89 ca b8 11 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 0c f7 d8 89 05 d2 47 01 00 48 83 c8 ff c3 b8
RSP: 002b:00007ffe82412058 EFLAGS: 00000206 ORIG_RAX: 0000000000000011
RAX: ffffffffffffffda RBX: 00007ffe82412648 RCX: 00007f47177eda7e
RDX: 0000000000000020 RSI: 00007ffe82412060 RDI: 0000000000000000
RBP: 00007ffe82412460 R08: 0000000000000020 R09: 00007ffe824122a0
R10: 0000000000000390 R11: 0000000000000206 R12: 00007ffe82412470
R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffe82412060
 </TASK>

Allocated by task 2041:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_noprof+0x27a/0x4f0
 ops_init+0x7b/0x5c0
 setup_net+0x10c/0x320
 copy_net_ns+0x31b/0x4d0
 create_new_namespaces+0x3f3/0x720
 unshare_nsproxy_namespaces+0x11c/0x170
 ksys_unshare+0x4c8/0x8c0
 __x64_sys_unshare+0x38/0x50
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 21749:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x62/0x70
 kfree+0x18e/0x440
 ops_undo_list+0x856/0x990
 cleanup_net+0x4c5/0x800
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30

The buggy address belongs to the object at ffff88811f541800
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
 freed 512-byte region [ffff88811f541800, ffff88811f541a00)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11f540
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0x57ff00000000040(head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000040 ffff88801a441c80 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 057ff00000000040 ffff88801a441c80 0000000000000000 dead000000000001
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 057ff00000000002 ffffea00047d5001 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 0x252800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_THISNODE), pid 5816, tgid 5816 (syz-executor), ts 58518630075, free_ts 58503987541
 post_alloc_hook+0x240/0x2a0
 get_page_from_freelist+0x21e4/0x22c0
 __alloc_frozen_pages_noprof+0x181/0x370
 allocate_slab+0x65/0x3b0
 ___slab_alloc+0xbfc/0x1480
 __kmalloc_node_noprof+0x2fd/0x4e0
 alloc_slab_obj_exts+0x39/0xa0
 __memcg_slab_post_alloc_hook+0x31e/0x7f0
 kmem_cache_alloc_noprof+0x2bf/0x3c0
 anon_vma_clone+0xb8/0x4f0
 anon_vma_fork+0x79/0x500
 dup_mmap+0x9eb/0x1ac0
 copy_mm+0x13c/0x4b0
 copy_process+0x1706/0x3c00
 kernel_clone+0x21e/0x840
 __x64_sys_clone+0x18b/0x1e0
page last free pid 5270 tgid 5270 stack trace:
 __free_frozen_pages+0xc71/0xe70
 __put_partials+0x161/0x1c0
 put_cpu_partial+0x17c/0x250
 __slab_free+0x2f7/0x400
 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

Memory state around the buggy address:
 ffff88811f541700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88811f541780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88811f541800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff88811f541880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88811f541900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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