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BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x471/0x4b0
Read of size 2 at addr ffff88802e8d4c2a by task udevd/5297

CPU: 0 UID: 0 PID: 5297 Comm: udevd Not tainted 6.16.0-syzkaller-12063-g37816488247d-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:console_flush_all+0x7f7/0xc40
Code: 48 21 c3 0f 85 e9 01 00 00 e8 35 49 1f 00 48 8b 5c 24 20 4d 85 f6 75 07 e8 26 49 1f 00 eb 06 e8 1f 49 1f 00 fb 48 8b 44 24 28 <42> 80 3c 20 00 74 08 48 89 df e8 aa b3 82 00 48 8b 1b 48 8b 44 24
RSP: 0018:ffffc900024df620 EFLAGS: 00000293
RAX: 1ffffffff1d3610b RBX: ffffffff8e9b0858 RCX: ffff888023abd640
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900024df770 R08: ffffffff8fa34637 R09: 1ffffffff1f468c6
R10: dffffc0000000000 R11: fffffbfff1f468c7 R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000200 R15: ffffffff8e9b0800
 console_unlock+0xc4/0x270
 vprintk_emit+0x5b7/0x7a0
 devkmsg_emit+0xd6/0x120
 devkmsg_write+0x279/0x3f0
 do_iter_readv_writev+0x56e/0x7f0
 vfs_writev+0x31a/0x960
 do_writev+0x14d/0x2d0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f55b5d1ae03
Code: 89 c7 48 89 44 24 08 e8 6a f2 f9 ff 48 8b 44 24 08 48 83 c4 28 c3 c3 64 8b 04 25 18 00 00 00 85 c0 75 20 b8 14 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 6d 48 8b 15 f6 5f 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007fffbb759a18 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f55b5d1ae03
RDX: 0000000000000005 RSI: 00007fffbb759a80 RDI: 0000000000000005
RBP: 00007fffbb759a80 R08: 000000000000ff00 R09: 00007fffbb759398
R10: 0000000000000001 R11: 0000000000000246 R12: 000000000000001c
R13: 00007fffbb759ba8 R14: 0000000000000000 R15: 00007fffbb759b08
 </TASK>

Allocated by task 22354:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_cache_noprof+0x230/0x3d0
 resv_map_alloc+0x51/0x2c0
 hugetlbfs_get_inode+0x68/0x660
 hugetlb_file_setup+0x21d/0x630
 ksys_mmap_pgoff+0x22f/0x760
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 22353:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5b/0x80
 kfree+0x18e/0x440
 hugetlbfs_evict_inode+0xf1/0x230
 evict+0x504/0x9c0
 __dentry_kill+0x209/0x660
 dput+0x19f/0x2b0
 __fput+0x68e/0xa70
 task_work_run+0x1d4/0x260
 get_signal+0x11ed/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

The buggy address belongs to the object at ffff88802e8d4c00
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
 freed 512-byte region [ffff88802e8d4c00, ffff88802e8d4e00)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88802e8d4c00 pfn:0x2e8d4
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 ffffea0000b9b710 ffffea0000be4c10
raw: ffff88802e8d4c00 000000000010000f 00000000f5000000 0000000000000000
head: 00fff00000000240 ffff88801a441c80 ffffea0000b9b710 ffffea0000be4c10
head: ffff88802e8d4c00 000000000010000f 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea0000ba3501 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 56400302583, 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_cache_noprof+0x296/0x3d0
 inetdev_init+0x7d/0x500
 inetdev_event+0x301/0x15b0
 notifier_call_chain+0x1b6/0x3e0
 register_netdevice+0x1608/0x1ae0
 wg_newlink+0x391/0x640
 rtnl_newlink_create+0x310/0xb00
 rtnl_newlink+0x16d6/0x1c70
 rtnetlink_rcv_msg+0x7cf/0xb70
 netlink_rcv_skb+0x208/0x470
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88802e8d4b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88802e8d4b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88802e8d4c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff88802e8d4c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88802e8d4d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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