------------[ cut here ]------------
sk->sk_forward_alloc
WARNING: net/ipv4/af_inet.c:162 at inet_sock_destruct+0x62d/0x740 net/ipv4/af_inet.c:162, CPU#1: syz.3.3172/18451
Modules linked in:
CPU: 1 UID: 0 PID: 18451 Comm: syz.3.3172 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:inet_sock_destruct+0x62d/0x740 net/ipv4/af_inet.c:162
Code: 0f 0b 90 e9 58 fe ff ff e8 20 a2 9f f7 90 0f 0b 90 e9 8b fe ff ff e8 12 a2 9f f7 90 0f 0b 90 e9 b1 fe ff ff e8 04 a2 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:ffffc90000a08d20 EFLAGS: 00010246
RAX: ffffffff8a2615cc RBX: dffffc0000000000 RCX: ffff8880834bbe00
RDX: 0000000000000100 RSI: 0000000000000090 RDI: 0000000000000000
RBP: 0000000000000090 R08: ffff8880981013a7 R09: 1ffff11013020274
R10: dffffc0000000000 R11: ffffed1013020275 R12: ffff888098101100
R13: ffff888098101608 R14: ffff88809810138c R15: ffffffff8fea98c0
FS:  00007fd5fb7d66c0(0000) GS:ffff88812538b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2c34ec CR3: 0000000020700000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 __sk_destruct+0x8d/0x9d0 net/core/sock.c:2352
 rcu_do_batch kernel/rcu/tree.c:2617 [inline]
 rcu_core+0x7cd/0x1070 kernel/rcu/tree.c:2869
 handle_softirqs+0x22a/0x840 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:752
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1061
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:188 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:206
Code: 90 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 ba 13 f6 f5 48 89 df e8 c2 88 f6 f5 e8 2d 23 22 f6 fb bf 01 00 00 00 <e8> f2 07 e8 f5 65 8b 05 bb 8d 8d 07 85 c0 74 07 5b c3 cc cc cc cc
RSP: 0018:ffffc90004d77340 EFLAGS: 00000206
RAX: 00000000000164b7 RBX: ffff88807a654560 RCX: 0000000080000002
RDX: 0000000000000006 RSI: ffffffff8dfad876 RDI: 0000000000000001
RBP: 1ffff1100f4ca8ab R08: ffffffff903084f7 R09: 1ffffffff206109e
R10: dffffc0000000000 R11: fffffbfff206109f R12: ffff88807a654560
R13: dffffc0000000000 R14: 00fff20000020021 R15: ffff88807a654558
 spin_unlock_irq include/linux/spinlock.h:402 [inline]
 filemap_remove_folio+0x102/0x3a0 mm/filemap.c:259
 truncate_inode_folio+0x5d/0x70 mm/truncate.c:176
 shmem_undo_range+0x42f/0x1660 mm/shmem.c:1145
 shmem_fallocate+0xdb8/0xec0 mm/shmem.c:3772
 vfs_fallocate+0x669/0x7e0 fs/open.c:338
 ioctl_preallocate fs/ioctl.c:289 [inline]
 file_ioctl+0x5bf/0x860 fs/ioctl.c:329
 do_vfs_ioctl+0xc26/0x1530 fs/ioctl.c:576
 __do_sys_ioctl fs/ioctl.c:595 [inline]
 __se_sys_ioctl+0x82/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd5fa99ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd5fb7d6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd5fac15fa0 RCX: 00007fd5fa99ce59
RDX: 0000200000000180 RSI: 0000000040305828 RDI: 0000000000000004
RBP: 00007fd5faa32d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd5fac16038 R14: 00007fd5fac15fa0 R15: 00007ffe8a40f7d8
 </TASK>
----------------
Code disassembly (best guess):
   0:	90                   	nop
   1:	f3 0f 1e fa          	endbr64
   5:	53                   	push   %rbx
   6:	48 89 fb             	mov    %rdi,%rbx
   9:	48 83 c7 18          	add    $0x18,%rdi
   d:	48 8b 74 24 08       	mov    0x8(%rsp),%rsi
  12:	e8 ba 13 f6 f5       	call   0xf5f613d1
  17:	48 89 df             	mov    %rbx,%rdi
  1a:	e8 c2 88 f6 f5       	call   0xf5f688e1
  1f:	e8 2d 23 22 f6       	call   0xf6222351
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
* 2a:	e8 f2 07 e8 f5       	call   0xf5e80821 <-- trapping instruction
  2f:	65 8b 05 bb 8d 8d 07 	mov    %gs:0x78d8dbb(%rip),%eax        # 0x78d8df1
  36:	85 c0                	test   %eax,%eax
  38:	74 07                	je     0x41
  3a:	5b                   	pop    %rbx
  3b:	c3                   	ret
  3c:	cc                   	int3
  3d:	cc                   	int3
  3e:	cc                   	int3
  3f:	cc                   	int3