------------[ 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-executor/30912
Modules linked in:
CPU: 0 UID: 0 PID: 30912 Comm: syz-executor 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 70 c3 9f f7 90 0f 0b 90 e9 8b fe ff ff e8 62 c3 9f f7 90 0f 0b 90 e9 b1 fe ff ff e8 54 c3 9f 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: ffffffff8a25eb1c RBX: dffffc0000000000 RCX: ffff888024e8db80
RDX: 0000000000000100 RSI: 0000000000000f70 RDI: 0000000000000000
RBP: 0000000000000f70 R08: ffff88801df27127 R09: 1ffff11003be4e24
R10: dffffc0000000000 R11: ffffed1003be4e25 R12: ffff88801df26e80
R13: dffffc0000000000 R14: ffff88801df2710c R15: ffffffff8fcac5c0
FS:  000055555c87c500(0000) GS:ffff88812545a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8a7dd456b8 CR3: 0000000050122000 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_is_held_type+0x106/0x150 kernel/locking/lockdep.c:5945
Code: 18 00 00 b8 ff ff ff ff 65 0f c1 05 04 90 6d 07 83 f8 01 75 25 9c 58 a9 00 02 00 00 75 39 41 f7 c4 00 02 00 00 74 01 fb 89 d8 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 cb e2 02 00 cc 90 0f 0b 90 48 c7
RSP: 0018:ffffc90005b97700 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000000000046
RDX: ffff888024e8db80 RSI: ffffffff8e16a5c2 RDI: ffffffff8c27cb00
RBP: 0000000000000000 R08: ffff888024e8db80 R09: 0000000000000004
R10: 0000000000000003 R11: 0000000000000000 R12: 0000000000000246
R13: ffff888024e8db80 R14: ffff88806bf6ccc0 R15: 0000000000000001
 rwsem_assert_held_write include/linux/rwsem.h:221 [inline]
 mmap_assert_write_locked include/linux/mmap_lock.h:76 [inline]
 __vma_raw_mm_seqnum include/linux/mmap_lock.h:272 [inline]
 __vma_start_write+0x87/0x290 mm/mmap_lock.c:141
 vma_start_write_killable include/linux/mmap_lock.h:325 [inline]
 dup_mmap+0x66b/0x1d90 mm/mmap.c:1766
 dup_mm kernel/fork.c:1531 [inline]
 copy_mm+0x13b/0x4a0 kernel/fork.c:1583
 copy_process+0x18b6/0x3cd0 kernel/fork.c:2223
 kernel_clone+0x248/0x8e0 kernel/fork.c:2653
 __do_sys_clone kernel/fork.c:2794 [inline]
 __se_sys_clone kernel/fork.c:2778 [inline]
 __x64_sys_clone+0x1b6/0x230 kernel/fork.c:2778
 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: 0033:0x7f8a7cfc5212
Code: 89 e7 e8 71 8b f7 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 66 89 c5 85 c0 75 3b 64 48 8b 04 25 10 00 00
RSP: 002b:00007ffe66c6d370 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffe66c6d370 RCX: 00007f8a7cfc5212
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffe66c6d4fc R08: 0000000000000000 R09: 0000000000000001
R10: 000055555c87c7d0 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000000927c0 R14: 00000000000c6327 R15: 00007ffe66c6d550
 </TASK>
----------------
Code disassembly (best guess):
   0:	18 00                	sbb    %al,(%rax)
   2:	00 b8 ff ff ff ff    	add    %bh,-0x1(%rax)
   8:	65 0f c1 05 04 90 6d 	xadd   %eax,%gs:0x76d9004(%rip)        # 0x76d9014
   f:	07
  10:	83 f8 01             	cmp    $0x1,%eax
  13:	75 25                	jne    0x3a
  15:	9c                   	pushf
  16:	58                   	pop    %rax
  17:	a9 00 02 00 00       	test   $0x200,%eax
  1c:	75 39                	jne    0x57
  1e:	41 f7 c4 00 02 00 00 	test   $0x200,%r12d
  25:	74 01                	je     0x28
  27:	fb                   	sti
  28:	89 d8                	mov    %ebx,%eax
* 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 cb e2 02 00       	jmp    0x2e304
  39:	cc                   	int3
  3a:	90                   	nop
  3b:	0f 0b                	ud2
  3d:	90                   	nop
  3e:	48                   	rex.W
  3f:	c7                   	.byte 0xc7