------------[ 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: kworker/u8:1/12439
Modules linked in:
CPU: 0 UID: 0 PID: 12439 Comm: kworker/u8:1 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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 b0 d9 9f f7 90 0f 0b 90 e9 8b fe ff ff e8 a2 d9 9f f7 90 0f 0b 90 e9 b1 fe ff ff e8 94 d9 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: ffffffff8a25d42c RBX: dffffc0000000000 RCX: ffff888031599e80
RDX: 0000000000000100 RSI: 0000000000000090 RDI: 0000000000000000
RBP: 0000000000000090 R08: ffff88801b7924a7 R09: 1ffff110036f2494
R10: dffffc0000000000 R11: ffffed10036f2495 R12: ffff88801b792200
R13: dffffc0000000000 R14: ffff88801b79248c R15: ffffffff8fcac100
FS:  0000000000000000(0000) GS:ffff88812545a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055558e377a28 CR3: 0000000075a96000 CR4: 0000000000350ef0
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
 common_interrupt+0xbb/0xe0 arch/x86/kernel/irq.c:326
 </IRQ>
 <TASK>
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688
RIP: 0010:__unwind_start+0xf7/0x760 arch/x86/kernel/unwind_orc.c:727
Code: c4 28 5b 41 5c 41 5d 41 5e 41 5f 5d e9 9d 99 99 ff cc 4d 85 e4 0f 85 a8 00 00 00 48 8d 6b 48 4c 8d 63 38 48 8d 35 00 00 00 00 <48> 89 e1 48 89 e8 48 89 4c 24 08 48 89 04 24 48 89 e8 48 c1 e8 03
RSP: 0018:ffffc90003e87328 EFLAGS: 00000246

RAX: ffff888031599e80 RBX: ffffc90003e87388 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: ffffffff8176a787 RDI: ffffc90003e873e8
RBP: ffffc90003e873d0 R08: ffffc90003e873e7 R09: ffffc90003e87388
R10: dffffc0000000000 R11: fffff520007d0e7d R12: ffffc90003e873c0
R13: ffff888031599e80 R14: ffffc90003e873b0 R15: 1ffff920007d0e76
 unwind_start arch/x86/include/asm/unwind.h:64 [inline]
 arch_stack_walk+0xe3/0x150 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 unpoison_slab_object mm/kasan/common.c:340 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4538 [inline]
 slab_alloc_node mm/slub.c:4866 [inline]
 kmem_cache_alloc_noprof+0x2bc/0x650 mm/slub.c:4873
 ptlock_alloc mm/memory.c:7457 [inline]
 ptlock_init include/linux/mm.h:3494 [inline]
 pmd_ptlock_init include/linux/mm.h:3606 [inline]
 pagetable_pmd_ctor include/linux/mm.h:3634 [inline]
 pmd_alloc_one_noprof include/asm-generic/pgalloc.h:146 [inline]
 __pmd_alloc+0xc1/0x5c0 mm/memory.c:6710
 pmd_alloc include/linux/mm.h:3320 [inline]
 __handle_mm_fault mm/memory.c:6407 [inline]
 handle_mm_fault+0xe96/0x3310 mm/memory.c:6624
 faultin_page mm/gup.c:1126 [inline]
 __get_user_pages+0x165b/0x29d0 mm/gup.c:1428
 __get_user_pages_locked mm/gup.c:1692 [inline]
 get_user_pages_remote+0x2f6/0xab0 mm/gup.c:2614
 get_arg_page fs/exec.c:163 [inline]
 copy_string_kernel+0x2f9/0x5f0 fs/exec.c:566
 kernel_execve+0x52a/0x930 fs/exec.c:1879
 call_usermodehelper_exec_async+0x20f/0x360 kernel/umh.c:109
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	28 5b 41             	sub    %bl,0x41(%rbx)
   3:	5c                   	pop    %rsp
   4:	41 5d                	pop    %r13
   6:	41 5e                	pop    %r14
   8:	41 5f                	pop    %r15
   a:	5d                   	pop    %rbp
   b:	e9 9d 99 99 ff       	jmp    0xff9999ad
  10:	cc                   	int3
  11:	4d 85 e4             	test   %r12,%r12
  14:	0f 85 a8 00 00 00    	jne    0xc2
  1a:	48 8d 6b 48          	lea    0x48(%rbx),%rbp
  1e:	4c 8d 63 38          	lea    0x38(%rbx),%r12
  22:	48 8d 35 00 00 00 00 	lea    0x0(%rip),%rsi        # 0x29
* 29:	48 89 e1             	mov    %rsp,%rcx <-- trapping instruction
  2c:	48 89 e8             	mov    %rbp,%rax
  2f:	48 89 4c 24 08       	mov    %rcx,0x8(%rsp)
  34:	48 89 04 24          	mov    %rax,(%rsp)
  38:	48 89 e8             	mov    %rbp,%rax
  3b:	48 c1 e8 03          	shr    $0x3,%rax