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BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x471/0x4b0
Read of size 2 at addr ffff88811bf1d82a by task syz.0.3511/19422

CPU: 1 UID: 0 PID: 19422 Comm: syz.0.3511 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:lock_release+0x44/0x3e0
Code: 8b 05 70 f4 02 11 48 89 44 24 28 0f 1f 44 00 00 65 8b 05 73 f4 02 11 83 f8 08 0f 83 9a 02 00 00 89 c0 48 0f a3 05 5c 17 06 0e <73> 16 e8 45 f1 08 00 84 c0 75 0d f6 05 bf fc ef 0d 01 0f 84 ad 02
RSP: 0018:ffffc90004e9f2e8 EFLAGS: 00000297
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffff88811f011cc0
RDX: 0000000000000000 RSI: ffffffff822e41f7 RDI: ffffffff8e139ee0
RBP: ffff88801c1958c0 R08: ffff88801c1958bf R09: 1ffff11003832b17
R10: dffffc0000000000 R11: ffffed1003832b18 R12: 0000000000000000
R13: ffffffff822e41f7 R14: ffffffff8e139ee0 R15: ffff88801c1958b8
 page_table_check_clear+0x4f3/0x700
 unmap_page_range+0x3445/0x4370
 unmap_vmas+0x399/0x580
 exit_mmap+0x248/0xb50
 __mmput+0x118/0x420
 exit_mm+0x1da/0x2c0
 do_exit+0x648/0x2300
 do_group_exit+0x21c/0x2d0
 get_signal+0x1286/0x1340
 arch_do_signal_or_restart+0x9a/0x750
 exit_to_user_mode_loop+0x75/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcb44f8ebe9
Code: Unable to access opcode bytes at 0x7fcb44f8ebbf.
RSP: 002b:00007fcb45d970e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fcb451b6098 RCX: 00007fcb44f8ebe9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fcb451b6098
RBP: 00007fcb451b6090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcb451b6128 R14: 00007fff81f917e0 R15: 00007fff81f918c8
 </TASK>

Allocated by task 19207:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_cache_noprof+0x230/0x3d0
 tomoyo_find_next_domain+0xdc/0x1aa0
 tomoyo_bprm_check_security+0x11c/0x180
 security_bprm_check+0x89/0x270
 bprm_execve+0x8ee/0x1450
 kernel_execve+0x8f0/0x9f0
 call_usermodehelper_exec_async+0x210/0x360
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30

Freed by task 19207:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5b/0x80
 kfree+0x18e/0x440
 tomoyo_find_next_domain+0x173e/0x1aa0
 tomoyo_bprm_check_security+0x11c/0x180
 security_bprm_check+0x89/0x270
 bprm_execve+0x8ee/0x1450
 kernel_execve+0x8f0/0x9f0
 call_usermodehelper_exec_async+0x210/0x360
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30

The buggy address belongs to the object at ffff88811bf1d800
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
 freed 512-byte region [ffff88811bf1d800, ffff88811bf1da00)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11bf1c
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x57ff00000000040(head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000040 ffff88801a441c80 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 057ff00000000040 ffff88801a441c80 dead000000000100 dead000000000122
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 057ff00000000002 ffffea00046fc701 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 5845, tgid 5845 (syz-executor), ts 44817527537, free_ts 0
 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_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_owner free stack trace missing

Memory state around the buggy address:
 ffff88811bf1d700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88811bf1d780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88811bf1d800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff88811bf1d880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88811bf1d900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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