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BUG: KASAN: use-after-free in rose_timer_expiry+0x471/0x4b0
Read of size 2 at addr ffff88811208e82a by task syz-executor/13108

CPU: 1 UID: 0 PID: 13108 Comm: syz-executor Not tainted 6.16.0-syzkaller-12063-g37816488247d #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:_raw_write_unlock_irq+0x29/0x50
Code: 90 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 3a 11 22 f6 48 89 df e8 72 b1 22 f6 e8 7d fa 4b f6 fb bf 01 00 00 00 <e8> e2 a1 14 f6 65 8b 05 5b 95 24 07 85 c0 74 07 5b e9 01 41 00 00
RSP: 0018:ffffc900048af810 EFLAGS: 00000282
RAX: 69f43c8ec07b1900 RBX: ffffffff8de0c040 RCX: 69f43c8ec07b1900
RDX: 0000000000000000 RSI: ffffffff8d9b4943 RDI: 0000000000000001
RBP: ffffc900048af9d0 R08: ffffffff8fa34737 R09: 1ffffffff1f468e6
R10: dffffc0000000000 R11: fffffbfff1f468e7 R12: 0000000000000000
R13: ffffc900048af940 R14: ffff888020826910 R15: ffff88803b1a0000
 release_task+0x12f9/0x17f0
 wait_consider_task+0x1944/0x2e10
 __do_wait+0x153/0x740
 do_wait+0x1f8/0x520
 kernel_wait4+0x1af/0x280
 __x64_sys_wait4+0x133/0x1e0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3368f84e57
Code: 89 7c 24 10 48 89 4c 24 18 e8 45 1b 03 00 4c 8b 54 24 18 8b 54 24 14 41 89 c0 48 8b 74 24 08 8b 7c 24 10 b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 89 44 24 10 e8 95 1b 03 00 8b 44
RSP: 002b:00007ffcd35fe700 EFLAGS: 00000293 ORIG_RAX: 000000000000003d
RAX: ffffffffffffffda RBX: 00000000000009ad RCX: 00007f3368f84e57
RDX: 0000000040000001 RSI: 00007ffcd35fe76c RDI: 00000000ffffffff
RBP: 00007ffcd35fe76c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000001388
R13: 00000000000927c0 R14: 0000000000045cf5 R15: 00007ffcd35fe7c0
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88811208fe00 pfn:0x11208e
flags: 0x57ff00000000000(node=1|zone=2|lastcpupid=0x7ff)
raw: 057ff00000000000 dead000000000100 dead000000000122 0000000000000000
raw: ffff88811208fe00 0000000000150000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 1, migratetype Unmovable, gfp_mask 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 18636, tgid 18627 (syz.3.5572), ts 246395403814, free_ts 250162818305
 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
 kmem_cache_alloc_bulk_noprof+0x20e/0x790
 bpf_test_run_xdp_live+0x15f1/0x1b10
 bpf_prog_test_run_xdp+0x713/0x1000
 bpf_prog_test_run+0x2c7/0x340
 __sys_bpf+0x581/0x870
 __x64_sys_bpf+0x7c/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 5847 tgid 5847 stack trace:
 __free_frozen_pages+0xbc4/0xd30
 __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
 vm_area_dup+0x2b/0x680
 dup_mmap+0x90c/0x1ac0
 copy_mm+0x13c/0x4b0
 copy_process+0x1706/0x3c00
 kernel_clone+0x21e/0x840
 __x64_sys_clone+0x18b/0x1e0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88811208e700: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88811208e780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88811208e800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                  ^
 ffff88811208e880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88811208e900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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