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BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x471/0x4b0
Read of size 2 at addr ffff88810abc7c2a by task syz-executor/26378

CPU: 0 UID: 0 PID: 26378 Comm: syz-executor Not tainted 6.16.0-syzkaller-06588-g759dfc7d04ba-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:unwind_next_frame+0x1323/0x2390
Code: 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 75 27 49 63 07 4c 01 f8 49 8d 4f 04 4c 39 e0 48 0f 46 e9 <49> 8d 47 fc 48 0f 47 d8 4d 0f 46 ef 48 39 dd 76 a2 e9 7b ef ff ff
RSP: 0000:ffffc900066bf2f8 EFLAGS: 00000283
RAX: ffffffff81faeb78 RBX: ffffffff8fbb35ec RCX: ffffffff8fbb35f0
RDX: ffffffff8fbb35ec RSI: ffffffff903a0e00 RDI: ffffffff8be309a0
RBP: ffffffff8fbb35f0 R08: 0000000000000001 R09: ffffffff8172cd05
R10: ffffc900066bf418 R11: ffffffff81ac3450 R12: ffffffff81faf0c8
R13: ffffffff8fbb35ec R14: ffffc900066bf3c8 R15: ffffffff8fbb35ec
 arch_stack_walk+0x11c/0x150
 stack_trace_save+0x9c/0xe0
 save_stack+0xf5/0x1f0
 __reset_page_owner+0x71/0x1f0
 free_unref_folios+0xc66/0x14d0
 folios_put_refs+0x559/0x640
 folio_batch_move_lru+0x319/0x3a0
 __folio_batch_add_and_move+0x5ad/0xd20
 do_wp_page+0x1c09/0x5800
 __handle_mm_fault+0x1144/0x5620
 handle_mm_fault+0x40a/0x8e0
 do_user_addr_fault+0xa81/0x1390
 exc_page_fault+0x76/0xf0
 asm_exc_page_fault+0x26/0x30
RIP: 0033:0x7f640ad4d7c7
Code: 00 00 00 80 3d 71 f0 d9 00 00 0f 84 84 00 00 00 48 c7 c0 d8 ff ff ff c7 05 6a f0 d9 00 00 00 00 00 64 48 8b 08 48 85 c9 74 0b <48> c7 81 80 08 00 00 01 00 00 00 48 c7 05 43 f0 d9 00 00 00 00 00
RSP: 002b:00007ffd5677bd78 EFLAGS: 00010206
RAX: ffffffffffffffd8 RBX: 0000000000000000 RCX: 00007f640af87cc0
RDX: 0000000000000000 RSI: 0000000000000018 RDI: 000055557dba97e0
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 000055557dba97d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 000000000005b0e1 R15: 00007ffd5677bf10
 </TASK>

Allocated by task 25707:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_noprof+0x27a/0x4f0
 copy_splice_read+0x143/0x9b0
 splice_direct_to_actor+0x4d0/0xcc0
 do_splice_direct+0x181/0x270
 do_sendfile+0x4da/0x7e0
 __se_sys_sendfile64+0x13e/0x190
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 25707:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x62/0x70
 kfree+0x18e/0x440
 copy_splice_read+0x881/0x9b0
 splice_direct_to_actor+0x4d0/0xcc0
 do_splice_direct+0x181/0x270
 do_sendfile+0x4da/0x7e0
 __se_sys_sendfile64+0x13e/0x190
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88810abc7c00
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
 freed 512-byte region [ffff88810abc7c00, ffff88810abc7e00)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88810abc6c00 pfn:0x10abc4
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x57ff00000000240(workingset|head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000240 ffff88801a441c80 ffffea0004b81a10 ffffea00049d7d10
raw: ffff88810abc6c00 0000000000100004 00000000f5000000 0000000000000000
head: 057ff00000000240 ffff88801a441c80 ffffea0004b81a10 ffffea00049d7d10
head: ffff88810abc6c00 0000000000100004 00000000f5000000 0000000000000000
head: 057ff00000000002 ffffea00042af101 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 179, tgid 179 (kworker/u10:3), ts 57103842693, free_ts 57026208206
 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/0x3b0
 ___slab_alloc+0xbfc/0x1480
 __kmalloc_noprof+0x305/0x4f0
 fib6_info_alloc+0x30/0xf0
 ip6_route_info_create+0x142/0x860
 addrconf_f6i_alloc+0x1d2/0x450
 ipv6_add_addr+0x56e/0x1090
 addrconf_add_linklocal+0x28c/0x6c0
 addrconf_addr_gen+0x490/0x580
 addrconf_init_auto_addrs+0x62d/0xa30
 addrconf_notify+0xacc/0x1010
 notifier_call_chain+0x1b6/0x3e0
page last free pid 179 tgid 179 stack trace:
 __free_frozen_pages+0xc71/0xe70
 __slab_free+0x326/0x400
 qlist_free_all+0x97/0x140
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 __kmalloc_cache_noprof+0x1be/0x3d0
 ipv6_add_addr+0x530/0x1090
 addrconf_add_linklocal+0x28c/0x6c0
 addrconf_addr_gen+0x490/0x580
 addrconf_init_auto_addrs+0x62d/0xa30
 addrconf_notify+0xacc/0x1010
 notifier_call_chain+0x1b6/0x3e0
 netif_state_change+0x284/0x3a0
 linkwatch_do_dev+0x117/0x170
 __linkwatch_run_queue+0x56a/0x7e0
 linkwatch_event+0x4c/0x60

Memory state around the buggy address:
 ffff88810abc7b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88810abc7b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88810abc7c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff88810abc7c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88810abc7d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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