------------[ 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.4.11998/20318
Modules linked in:
CPU: 1 UID: 0 PID: 20318 Comm: syz.4.11998 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 c0 f1 9d f7 90 0f 0b 90 e9 8b fe ff ff e8 b2 f1 9d f7 90 0f 0b 90 e9 b1 fe ff ff e8 a4 f1 9d 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: ffffffff8a27d2bc RBX: dffffc0000000000 RCX: ffff888031600000
RDX: 0000000000000100 RSI: 0000000000000090 RDI: 0000000000000000
RBP: 0000000000000090 R08: ffff88807f0cbe27 R09: 1ffff1100fe197c4
R10: dffffc0000000000 R11: ffffed100fe197c5 R12: ffff88807f0cbb80
R13: ffff88807f0cc088 R14: ffff88807f0cbe0c R15: ffffffff8feb2280
FS:  0000000000000000(0000) GS:ffff888125377000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa5b844f0d7 CR3: 00000000ac95a000 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:on_stack arch/x86/include/asm/stacktrace.h:55 [inline]
RIP: 0010:stack_access_ok arch/x86/kernel/unwind_orc.c:409 [inline]
RIP: 0010:deref_stack_reg+0x27/0x230 arch/x86/kernel/unwind_orc.c:419
Code: 90 90 90 55 41 57 41 56 41 55 41 54 53 48 83 ec 20 48 89 54 24 18 49 89 f0 49 89 ff 48 be 00 00 00 00 00 fc ff df 48 8d 5f 08 <49> 89 dc 49 c1 ec 03 41 80 3c 34 00 4c 89 04 24 74 16 48 89 df e8
RSP: 0018:ffffc90004397240 EFLAGS: 00000282
RAX: fffffffffffffff0 RBX: ffffc90004397370 RCX: 0000000000000000
RDX: ffffc900043973a8 RSI: dffffc0000000000 RDI: ffffc90004397368
RBP: dffffc0000000000 R08: ffffc90004397770 R09: 0000000000000000
R10: ffffc900043973b8 R11: fffff52000872e79 R12: ffffc90004397770
R13: 1ffff92000872e6f R14: ffffc90004397368 R15: ffffc90004397368
 unwind_next_frame+0x19d5/0x2550 arch/x86/kernel/unwind_orc.c:-1
 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
 __call_rcu_common kernel/rcu/tree.c:3131 [inline]
 call_rcu+0xee/0x890 kernel/rcu/tree.c:3251
 slab_free_hook mm/slub.c:2653 [inline]
 slab_free mm/slub.c:6250 [inline]
 kmem_cache_free+0x462/0x650 mm/slub.c:6377
 tear_down_vmas+0x312/0x520 mm/mmap.c:1262
 exit_mmap+0x4b6/0x9e0 mm/mmap.c:1320
 __mmput+0x118/0x430 kernel/fork.c:1178
 exit_mm+0x1f6/0x2d0 kernel/exit.c:582
 do_exit+0x6a2/0x22c0 kernel/exit.c:964
 do_group_exit+0x21b/0x2d0 kernel/exit.c:1119
 get_signal+0x1284/0x1330 kernel/signal.c:3037
 arch_do_signal_or_restart+0xbc/0x840 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop+0x8c/0x4d0 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f522659ce59
Code: Unable to access opcode bytes at 0x7f522659ce2f.
RSP: 002b:00007f52273fc0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f5226815fa8 RCX: 00007f522659ce59
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f5226815fa8
RBP: 00007f5226815fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5226816038 R14: 00007ffd18627670 R15: 00007ffd18627758
 </TASK>
----------------
Code disassembly (best guess):
   0:	90                   	nop
   1:	90                   	nop
   2:	90                   	nop
   3:	55                   	push   %rbp
   4:	41 57                	push   %r15
   6:	41 56                	push   %r14
   8:	41 55                	push   %r13
   a:	41 54                	push   %r12
   c:	53                   	push   %rbx
   d:	48 83 ec 20          	sub    $0x20,%rsp
  11:	48 89 54 24 18       	mov    %rdx,0x18(%rsp)
  16:	49 89 f0             	mov    %rsi,%r8
  19:	49 89 ff             	mov    %rdi,%r15
  1c:	48 be 00 00 00 00 00 	movabs $0xdffffc0000000000,%rsi
  23:	fc ff df
  26:	48 8d 5f 08          	lea    0x8(%rdi),%rbx
* 2a:	49 89 dc             	mov    %rbx,%r12 <-- trapping instruction
  2d:	49 c1 ec 03          	shr    $0x3,%r12
  31:	41 80 3c 34 00       	cmpb   $0x0,(%r12,%rsi,1)
  36:	4c 89 04 24          	mov    %r8,(%rsp)
  3a:	74 16                	je     0x52
  3c:	48 89 df             	mov    %rbx,%rdi
  3f:	e8                   	.byte 0xe8