------------[ cut here ]------------
sk->sk_forward_alloc
WARNING: net/ipv4/af_inet.c:163 at inet_sock_destruct+0x62d/0x740 net/ipv4/af_inet.c:163, CPU#0: syz.2.9843/9696
Modules linked in:
CPU: 0 UID: 0 PID: 9696 Comm: syz.2.9843 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:inet_sock_destruct+0x62d/0x740 net/ipv4/af_inet.c:163
Code: 0f 0b 90 e9 58 fe ff ff e8 90 14 a0 f7 90 0f 0b 90 e9 8b fe ff ff e8 82 14 a0 f7 90 0f 0b 90 e9 b1 fe ff ff e8 74 14 a0 f7 90 <0f> 0b 90 e9 d7 fe ff ff 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 95 fc
RSP: 0018:ffffc90000007d48 EFLAGS: 00010246
RAX: ffffffff8a258c8c RBX: dffffc0000000000 RCX: ffff888052611e80
RDX: 0000000000000100 RSI: 0000000000000090 RDI: 0000000000000000
RBP: 0000000000000090 R08: ffff888057cd35a7 R09: 1ffff1100af9a6b4
R10: dffffc0000000000 R11: ffffed100af9a6b5 R12: ffff888057cd3300
R13: dffffc0000000000 R14: ffff888057cd358c R15: ffffffff8fcaaf40
FS:  0000000000000000(0000) GS:ffff88812545d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe9781456b8 CR3: 000000005d1e8000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 __sk_destruct+0x85/0x880 net/core/sock.c:2350
 rcu_do_batch kernel/rcu/tree.c:2617 [inline]
 rcu_core+0x7cd/0x1070 kernel/rcu/tree.c:2869
 handle_softirqs+0x22a/0x870 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:lock_acquire+0x20b/0x2e0 kernel/locking/lockdep.c:5872
Code: e9 30 ff ff ff e8 75 26 0d 0a f7 c3 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 f1 a3 7a 11 48 3b 44 24 30 75 33 fb 48 83 c4 38 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 56 0c 10 0a cc 48 8d 3d 2e 6c 73
RSP: 0018:ffffc9000c717598 EFLAGS: 00000282
RAX: 582f89dd1d052500 RBX: 0000000000000246 RCX: 0000000000000046
RDX: 000000000ebbe7c5 RSI: ffffffff8e168ad8 RDI: ffffffff8c27c200
RBP: 0000000000000000 R08: ffffffff82397e65 R09: ffffffff8e75e520
R10: dffffc0000000000 R11: fffffbfff2023497 R12: 0000000000000002
R13: ffffffff8e75e520 R14: 0000000000000000 R15: 0000000000000000
 rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
 rcu_read_lock include/linux/rcupdate.h:850 [inline]
 percpu_ref_tryget_many include/linux/percpu-refcount.h:241 [inline]
 percpu_ref_tryget+0x31/0x180 include/linux/percpu-refcount.h:266
 css_tryget include/linux/cgroup_refcnt.h:45 [inline]
 get_mem_cgroup_from_objcg include/linux/memcontrol.h:519 [inline]
 obj_cgroup_uncharge_pages mm/memcontrol.c:2831 [inline]
 refill_obj_stock+0x5fd/0xa80 mm/memcontrol.c:3119
 __memcg_slab_free_hook+0x14d/0x470 mm/memcontrol.c:3282
 memcg_slab_free_hook mm/slub.c:2484 [inline]
 slab_free mm/slub.c:6162 [inline]
 kfree+0x3ca/0x630 mm/slub.c:6483
 devinet_sysctl_unregister net/ipv4/devinet.c:2729 [inline]
 inetdev_destroy net/ipv4/devinet.c:334 [inline]
 inetdev_event+0x7cd/0x1610 net/ipv4/devinet.c:1655
 notifier_call_chain+0x1be/0x400 kernel/notifier.c:85
 call_netdevice_notifiers_extack net/core/dev.c:2287 [inline]
 call_netdevice_notifiers net/core/dev.c:2301 [inline]
 unregister_netdevice_many_notify+0x186a/0x2370 net/core/dev.c:12426
 unregister_netdevice_many net/core/dev.c:12489 [inline]
 unregister_netdevice_queue+0x31f/0x360 net/core/dev.c:12303
 unregister_netdevice include/linux/netdevice.h:3409 [inline]
 __tun_detach+0x6d9/0x15d0 drivers/net/tun.c:621
 tun_detach drivers/net/tun.c:637 [inline]
 tun_chr_close+0x10a/0x1c0 drivers/net/tun.c:3436
 __fput+0x44f/0xa70 fs/file_table.c:469
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x70f/0x23c0 kernel/exit.c:976
 do_group_exit+0x21b/0x2d0 kernel/exit.c:1118
 __do_sys_exit_group kernel/exit.c:1129 [inline]
 __se_sys_exit_group kernel/exit.c:1127 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1127
 x64_sys_call+0x221a/0x2240 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4d3d99c799
Code: Unable to access opcode bytes at 0x7f4d3d99c76f.
RSP: 002b:00007ffdffd0a7f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 000000000000000b RCX: 00007f4d3d99c799
RDX: 0000000000000001 RSI: 0000000000000000 RDI: 000000000000000b
RBP: 00000000000012da R08: 00007ffdffd0ac87 R09: 000000000000000b
R10: 00007f4d3dc15fa0 R11: 0000000000000246 R12: 0000000000000003
R13: 00007f4d3dc1627c R14: 00007f4d3dc16278 R15: 00007f4d3dc16270
 </TASK>
----------------
Code disassembly (best guess):
   0:	e9 30 ff ff ff       	jmp    0xffffff35
   5:	e8 75 26 0d 0a       	call   0xa0d267f
   a:	f7 c3 00 02 00 00    	test   $0x200,%ebx
  10:	0f 84 38 ff ff ff    	je     0xffffff4e
  16:	65 48 8b 05 f1 a3 7a 	mov    %gs:0x117aa3f1(%rip),%rax        # 0x117aa40f
  1d:	11
  1e:	48 3b 44 24 30       	cmp    0x30(%rsp),%rax
  23:	75 33                	jne    0x58
  25:	fb                   	sti
  26:	48 83 c4 38          	add    $0x38,%rsp
* 2a:	5b                   	pop    %rbx <-- trapping instruction
  2b:	41 5c                	pop    %r12
  2d:	41 5d                	pop    %r13
  2f:	41 5e                	pop    %r14
  31:	41 5f                	pop    %r15
  33:	5d                   	pop    %rbp
  34:	e9 56 0c 10 0a       	jmp    0xa100c8f
  39:	cc                   	int3
  3a:	48                   	rex.W
  3b:	8d                   	.byte 0x8d
  3c:	3d                   	.byte 0x3d
  3d:	2e 6c                	cs insb (%dx),%es:(%rdi)
  3f:	73                   	.byte 0x73