==================================================================
BUG: KASAN: slab-use-after-free in __hlist_del include/linux/list.h:982 [inline]
BUG: KASAN: slab-use-after-free in hlist_del_rcu include/linux/rculist.h:560 [inline]
BUG: KASAN: slab-use-after-free in __xfrm_state_delete+0x9e5/0xa30 net/xfrm/xfrm_state.c:830
Write of size 8 at addr ffff88805a70c030 by task syz.2.1373/12267

CPU: 0 UID: 0 PID: 12267 Comm: syz.2.1373 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xcd/0x630 mm/kasan/report.c:482
 kasan_report+0xe0/0x110 mm/kasan/report.c:595
 __hlist_del include/linux/list.h:982 [inline]
 hlist_del_rcu include/linux/rculist.h:560 [inline]
 __xfrm_state_delete+0x9e5/0xa30 net/xfrm/xfrm_state.c:830
 xfrm_timer_handler+0x86c/0xf10 net/xfrm/xfrm_state.c:716
 __run_hrtimer kernel/time/hrtimer.c:1761 [inline]
 __hrtimer_run_queues+0x1ff/0xad0 kernel/time/hrtimer.c:1825
 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1842
 handle_softirqs+0x219/0x8e0 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:unwind_next_frame+0x666/0x20a0 arch/x86/kernel/unwind_orc.c:521
Code: 0f 9e c7 40 84 f6 40 0f 95 c6 40 84 f7 0f 85 a1 16 00 00 83 e0 07 38 c2 40 0f 9e c6 84 d2 0f 95 c0 40 84 c6 0f 85 8a 16 00 00 <4c> 0f bf 31 4d 01 fe 0f b6 41 05 83 e0 07 3c 03 0f 84 9c 05 00 00
RSP: 0018:ffffc90005386f98 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff91500f80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffc90005387050 R08: ffffffff91500f84 R09: 0000000000000000
R10: ffffc90005387008 R11: 0000000000012a8a R12: ffffc90005387058
R13: ffffc90005387008 R14: 0000000000000005 R15: ffffc90005387248
 arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
 save_stack+0x160/0x1f0 mm/page_owner.c:156
 __set_page_owner+0x91/0x550 mm/page_owner.c:329
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1851
 prep_new_page mm/page_alloc.c:1859 [inline]
 get_page_from_freelist+0x132b/0x38e0 mm/page_alloc.c:3858
 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:5148
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
 alloc_frozen_pages_noprof mm/mempolicy.c:2487 [inline]
 alloc_pages_noprof+0x131/0x390 mm/mempolicy.c:2507
 vm_area_alloc_pages mm/vmalloc.c:3642 [inline]
 __vmalloc_area_node mm/vmalloc.c:3720 [inline]
 __vmalloc_node_range_noprof+0x72f/0x14b0 mm/vmalloc.c:3893
 __vmalloc_node_noprof+0xad/0xf0 mm/vmalloc.c:3956
 __snd_dma_alloc_pages+0x50/0x90 sound/core/memalloc.c:45
 snd_dma_alloc_dir_pages+0x151/0x240 sound/core/memalloc.c:79
 do_alloc_pages+0x136/0x2d0 sound/core/pcm_memory.c:69
 snd_pcm_lib_malloc_pages+0x3df/0x980 sound/core/pcm_memory.c:455
 snd_pcm_hw_params+0x1656/0x1ba0 sound/core/pcm_native.c:791
 snd_pcm_kernel_ioctl+0x147/0x2e0 sound/core/pcm_native.c:3494
 snd_pcm_oss_change_params_locked+0x1432/0x3a30 sound/core/oss/pcm_oss.c:965
 snd_pcm_oss_make_ready_locked+0xb7/0x130 sound/core/oss/pcm_oss.c:1186
 snd_pcm_oss_sync+0x32e/0x840 sound/core/oss/pcm_oss.c:1667
 snd_pcm_oss_release+0x28b/0x310 sound/core/oss/pcm_oss.c:2574
 __fput+0x3ff/0xb70 fs/file_table.c:468
 task_work_run+0x14d/0x240 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xeb/0x110 kernel/entry/common.c:43
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x3f6/0x490 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd67278ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd673633038 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fd6729b5fa0 RCX: 00007fd67278ebe9
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000002
RBP: 00007fd672811e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd6729b6038 R14: 00007fd6729b5fa0 R15: 00007ffd38ccb7d8
 </TASK>

Allocated by task 11478:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 unpoison_slab_object mm/kasan/common.c:330 [inline]
 __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:356
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4180 [inline]
 slab_alloc_node mm/slub.c:4229 [inline]
 kmem_cache_alloc_noprof+0x1cb/0x3b0 mm/slub.c:4236
 xfrm_state_alloc+0x23/0x5c0 net/xfrm/xfrm_state.c:733
 __find_acq_core+0xb59/0x2900 net/xfrm/xfrm_state.c:1833
 xfrm_find_acq+0x7b/0xa0 net/xfrm/xfrm_state.c:2353
 xfrm_alloc_userspi+0x58e/0xbb0 net/xfrm/xfrm_user.c:1863
 xfrm_user_rcv_msg+0x4fb/0xb60 net/xfrm/xfrm_user.c:3501
 netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2552
 xfrm_netlink_rcv+0x71/0x90 net/xfrm/xfrm_user.c:3523
 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
 netlink_unicast+0x5a7/0x870 net/netlink/af_netlink.c:1346
 netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1896
 sock_sendmsg_nosec net/socket.c:714 [inline]
 __sock_sendmsg net/socket.c:729 [inline]
 ____sys_sendmsg+0xa98/0xc70 net/socket.c:2614
 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2668
 __sys_sendmsg+0x16d/0x220 net/socket.c:2700
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 10:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
 poison_slab_object mm/kasan/common.c:243 [inline]
 __kasan_slab_free+0x60/0x70 mm/kasan/common.c:275
 kasan_slab_free include/linux/kasan.h:233 [inline]
 slab_free_hook mm/slub.c:2417 [inline]
 slab_free mm/slub.c:4680 [inline]
 kmem_cache_free+0x2d1/0x4d0 mm/slub.c:4782
 xfrm_state_free net/xfrm/xfrm_state.c:591 [inline]
 xfrm_state_gc_destroy net/xfrm/xfrm_state.c:618 [inline]
 xfrm_state_gc_task+0x50a/0x770 net/xfrm/xfrm_state.c:634
 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

The buggy address belongs to the object at ffff88805a70c000
 which belongs to the cache xfrm_state of size 928
The buggy address is located 48 bytes inside of
 freed 928-byte region [ffff88805a70c000, ffff88805a70c3a0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5a70c
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff8881422e8c80 0000000000000000 0000000000000001
raw: 0000000000000000 00000000000f000f 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff8881422e8c80 0000000000000000 0000000000000001
head: 0000000000000000 00000000000f000f 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea000169c301 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 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5953, tgid 5951 (syz.2.3), ts 72555193988, free_ts 24189874052
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1851
 prep_new_page mm/page_alloc.c:1859 [inline]
 get_page_from_freelist+0x132b/0x38e0 mm/page_alloc.c:3858
 __alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:5148
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
 alloc_slab_page mm/slub.c:2487 [inline]
 allocate_slab mm/slub.c:2655 [inline]
 new_slab+0x247/0x330 mm/slub.c:2709
 ___slab_alloc+0xcf2/0x1740 mm/slub.c:3891
 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3981
 __slab_alloc_node mm/slub.c:4056 [inline]
 slab_alloc_node mm/slub.c:4217 [inline]
 kmem_cache_alloc_noprof+0xef/0x3b0 mm/slub.c:4236
 xfrm_state_alloc+0x23/0x5c0 net/xfrm/xfrm_state.c:733
 __find_acq_core+0xb59/0x2900 net/xfrm/xfrm_state.c:1833
 xfrm_find_acq+0x7b/0xa0 net/xfrm/xfrm_state.c:2353
 xfrm_alloc_userspi+0x58e/0xbb0 net/xfrm/xfrm_user.c:1863
 xfrm_user_rcv_msg+0x4fb/0xb60 net/xfrm/xfrm_user.c:3501
 netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2552
 xfrm_netlink_rcv+0x71/0x90 net/xfrm/xfrm_user.c:3523
 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
 netlink_unicast+0x5a7/0x870 net/netlink/af_netlink.c:1346
page last free pid 1 tgid 1 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 __free_frozen_pages+0x7d5/0x10f0 mm/page_alloc.c:2895
 __free_pages mm/page_alloc.c:5260 [inline]
 free_contig_range+0x183/0x4b0 mm/page_alloc.c:7091
 destroy_args+0x7f6/0xa60 mm/debug_vm_pgtable.c:958
 debug_vm_pgtable+0x1a32/0x3640 mm/debug_vm_pgtable.c:1340
 do_one_initcall+0x120/0x6e0 init/main.c:1269
 do_initcall_level init/main.c:1331 [inline]
 do_initcalls init/main.c:1347 [inline]
 do_basic_setup init/main.c:1366 [inline]
 kernel_init_freeable+0x5c2/0x910 init/main.c:1579
 kernel_init+0x1c/0x2b0 init/main.c:1469
 ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Memory state around the buggy address:
 ffff88805a70bf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88805a70bf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88805a70c000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff88805a70c080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88805a70c100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	0f 9e c7             	setle  %bh
   3:	40 84 f6             	test   %sil,%sil
   6:	40 0f 95 c6          	setne  %sil
   a:	40 84 f7             	test   %sil,%dil
   d:	0f 85 a1 16 00 00    	jne    0x16b4
  13:	83 e0 07             	and    $0x7,%eax
  16:	38 c2                	cmp    %al,%dl
  18:	40 0f 9e c6          	setle  %sil
  1c:	84 d2                	test   %dl,%dl
  1e:	0f 95 c0             	setne  %al
  21:	40 84 c6             	test   %al,%sil
  24:	0f 85 8a 16 00 00    	jne    0x16b4
* 2a:	4c 0f bf 31          	movswq (%rcx),%r14 <-- trapping instruction
  2e:	4d 01 fe             	add    %r15,%r14
  31:	0f b6 41 05          	movzbl 0x5(%rcx),%eax
  35:	83 e0 07             	and    $0x7,%eax
  38:	3c 03                	cmp    $0x3,%al
  3a:	0f 84 9c 05 00 00    	je     0x5dc