==================================================================
BUG: KFENCE: use-after-free write in __hlist_del include/linux/list.h:982 [inline]
BUG: KFENCE: use-after-free write in hlist_del_rcu include/linux/rculist.h:560 [inline]
BUG: KFENCE: use-after-free write in __xfrm_state_delete+0x696/0xca0 net/xfrm/xfrm_state.c:830

Use-after-free write at 0xffff88823bf5ec70 (in kfence-#174):
 __hlist_del include/linux/list.h:982 [inline]
 hlist_del_rcu include/linux/rculist.h:560 [inline]
 __xfrm_state_delete+0x696/0xca0 net/xfrm/xfrm_state.c:830
 xfrm_timer_handler+0x18f/0xa00 net/xfrm/xfrm_state.c:716
 __run_hrtimer kernel/time/hrtimer.c:1761 [inline]
 __hrtimer_run_queues+0x52c/0xc60 kernel/time/hrtimer.c:1825
 hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1842
 handle_softirqs+0x283/0x870 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0xca/0x1f0 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+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
 console_trylock_spinning kernel/printk/printk.c:2061 [inline]
 vprintk_emit+0x58f/0x7a0 kernel/printk/printk.c:2449
 _printk+0xcf/0x120 kernel/printk/printk.c:2475
 __nla_validate_parse+0x2563/0x2d40 lib/nlattr.c:647
 __nla_parse+0x40/0x60 lib/nlattr.c:732
 __nlmsg_parse include/net/netlink.h:789 [inline]
 genl_family_rcv_msg_attrs_parse+0x1c9/0x2a0 net/netlink/genetlink.c:945
 genl_family_rcv_msg_doit+0xb8/0x300 net/netlink/genetlink.c:1093
 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
 genl_rcv_msg+0x60e/0x790 net/netlink/genetlink.c:1210
 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2552
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
 netlink_unicast+0x82c/0x9e0 net/netlink/af_netlink.c:1346
 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896
 sock_sendmsg_nosec net/socket.c:714 [inline]
 __sock_sendmsg+0x219/0x270 net/socket.c:729
 ____sys_sendmsg+0x505/0x830 net/socket.c:2614
 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668
 __sys_sendmsg net/socket.c:2700 [inline]
 __do_sys_sendmsg net/socket.c:2705 [inline]
 __se_sys_sendmsg net/socket.c:2703 [inline]
 __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2703
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

kfence-#174: 0xffff88823bf5ef00-0xffff88823bf5efef, size=240, cache=skbuff_head_cache

allocated by task 4514 on cpu 1 at 394.984186s (0.523552s ago):
 __alloc_skb+0x112/0x2d0 net/core/skbuff.c:659
 alloc_skb include/linux/skbuff.h:1377 [inline]
 nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:763 [inline]
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:820 [inline]
 nsim_dev_trap_report_work+0x29a/0xb80 drivers/net/netdevsim/dev.c:866
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x436/0x7d0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

freed by task 4514 on cpu 1 at 394.984242s (0.523672s ago):
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:836 [inline]
 nsim_dev_trap_report_work+0x7cf/0xb80 drivers/net/netdevsim/dev.c:866
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x436/0x7d0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

CPU: 1 UID: 0 PID: 17101 Comm: syz.7.2916 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:__hlist_del include/linux/list.h:982 [inline]
RIP: 0010:hlist_del_rcu include/linux/rculist.h:560 [inline]
RIP: 0010:__xfrm_state_delete+0x696/0xca0 net/xfrm/xfrm_state.c:830
Code: 74 34 e8 fd 6a 9e f7 48 83 c3 08 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 ea e0 01 f8 <4c> 89 3b eb 0c e8 d0 6a 9e f7 eb 34 e8 c9 6a 9e f7 48 b8 00 00 00
RSP: 0018:ffffc90000a08ab0 EFLAGS: 00010246
RAX: 1ffff110477ebd8e RBX: ffff88823bf5ec70 RCX: dffffc0000000000
RDX: 0000000000000100 RSI: 00000000c4b52c06 RDI: ffff8880568bcce8
RBP: 1ffff1100ad1799e R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000141144 R12: ffff8880568bccf0
R13: ffff888032c14880 R14: ffff8880568bccc0 R15: ffff88802dbd3620
FS:  00007f959fdc26c0(0000) GS:ffff888125d13000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff88823bf5ec70 CR3: 0000000055aea000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 xfrm_timer_handler+0x18f/0xa00 net/xfrm/xfrm_state.c:716
 __run_hrtimer kernel/time/hrtimer.c:1761 [inline]
 __hrtimer_run_queues+0x52c/0xc60 kernel/time/hrtimer.c:1825
 hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1842
 handle_softirqs+0x283/0x870 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0xca/0x1f0 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+0xa6/0xc0 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:console_trylock_spinning kernel/printk/printk.c:2061 [inline]
RIP: 0010:vprintk_emit+0x58f/0x7a0 kernel/printk/printk.c:2449
Code: 85 32 01 00 00 e8 c1 87 1f 00 41 89 df 4d 85 f6 48 8b 1c 24 75 07 e8 b0 87 1f 00 eb 06 e8 a9 87 1f 00 fb 48 c7 c7 80 e3 12 8e <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 b9 35
RSP: 0018:ffffc9000516eee0 EFLAGS: 00000246
RAX: ffffffff81a03757 RBX: ffffffff81a03614 RCX: 0000000000080000
RDX: ffffc90011679000 RSI: 000000000007ffff RDI: ffffffff8e12e380
RBP: ffffc9000516eff0 R08: ffffffff8fa38c37 R09: 1ffffffff1f47186
R10: dffffc0000000000 R11: fffffbfff1f47187 R12: dffffc0000000000
R13: 1ffff92000a2dde0 R14: 0000000000000200 R15: 000000000000004e
 _printk+0xcf/0x120 kernel/printk/printk.c:2475
 __nla_validate_parse+0x2563/0x2d40 lib/nlattr.c:647
 __nla_parse+0x40/0x60 lib/nlattr.c:732
 __nlmsg_parse include/net/netlink.h:789 [inline]
 genl_family_rcv_msg_attrs_parse+0x1c9/0x2a0 net/netlink/genetlink.c:945
 genl_family_rcv_msg_doit+0xb8/0x300 net/netlink/genetlink.c:1093
 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
 genl_rcv_msg+0x60e/0x790 net/netlink/genetlink.c:1210
 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2552
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
 netlink_unicast+0x82c/0x9e0 net/netlink/af_netlink.c:1346
 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896
 sock_sendmsg_nosec net/socket.c:714 [inline]
 __sock_sendmsg+0x219/0x270 net/socket.c:729
 ____sys_sendmsg+0x505/0x830 net/socket.c:2614
 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668
 __sys_sendmsg net/socket.c:2700 [inline]
 __do_sys_sendmsg net/socket.c:2705 [inline]
 __se_sys_sendmsg net/socket.c:2703 [inline]
 __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2703
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f959ef8eba9
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:00007f959fdc2038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f959f1d5fa0 RCX: 00007f959ef8eba9
RDX: 000000000000c000 RSI: 0000200000000000 RDI: 0000000000000003
RBP: 00007f959f011e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f959f1d6038 R14: 00007f959f1d5fa0 R15: 00007ffe75de4e38
 </TASK>
==================================================================
----------------
Code disassembly (best guess):
   0:	74 34                	je     0x36
   2:	e8 fd 6a 9e f7       	call   0xf79e6b04
   7:	48 83 c3 08          	add    $0x8,%rbx
   b:	48 89 d8             	mov    %rbx,%rax
   e:	48 c1 e8 03          	shr    $0x3,%rax
  12:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  19:	fc ff df
  1c:	80 3c 08 00          	cmpb   $0x0,(%rax,%rcx,1)
  20:	74 08                	je     0x2a
  22:	48 89 df             	mov    %rbx,%rdi
  25:	e8 ea e0 01 f8       	call   0xf801e114
* 2a:	4c 89 3b             	mov    %r15,(%rbx) <-- trapping instruction
  2d:	eb 0c                	jmp    0x3b
  2f:	e8 d0 6a 9e f7       	call   0xf79e6b04
  34:	eb 34                	jmp    0x6a
  36:	e8 c9 6a 9e f7       	call   0xf79e6b04
  3b:	48                   	rex.W
  3c:	b8                   	.byte 0xb8
  3d:	00 00                	add    %al,(%rax)