syzbot

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WARNING: CPU: 0 PID: 4182 at net/ipv4/af_inet.c:157 inet_sock_destruct+0x63b/0x730 net/ipv4/af_inet.c:157
Modules linked in:
CPU: 0 PID: 4182 Comm: syz-execprog Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:inet_sock_destruct+0x63b/0x730 net/ipv4/af_inet.c:157
Code: 01 e8 49 b7 03 f9 0f 0b e9 64 fe ff ff e8 3d b7 03 f9 0f 0b e9 99 fe ff ff e8 31 b7 03 f9 0f 0b e9 c1 fe ff ff e8 25 b7 03 f9 <0f> 0b e9 e9 fe ff ff 44 89 f1 80 e1 07 fe c1 38 c1 0f 8c 5b fd ff
RSP: 0018:ffffc90000007b20 EFLAGS: 00010246
RAX: ffffffff887569eb RBX: dffffc0000000000 RCX: ffff888079441dc0
RDX: 0000000000000100 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000080000000 R08: ffff88807a08ca7f R09: 1ffff1100f41194f
R10: dffffc0000000000 R11: ffffed100f411950 R12: ffff88807a08c800
R13: ffff88807a08c800 R14: ffff88807a08ca20 R15: 1ffff1100f411902
FS:  0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000092976337e60 CR3: 0000000074846000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __sk_destruct+0x50/0x840 net/core/sock.c:1961
 sock_put include/net/sock.h:1989 [inline]
 sctp_endpoint_destroy_rcu+0x9d/0xe0 net/sctp/endpointola.c:193
 rcu_do_batch kernel/rcu/tree.c:2523 [inline]
 rcu_core+0x9d2/0x1670 kernel/rcu/tree.c:2763
 handle_softirqs+0x339/0x830 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:__preempt_count_add arch/x86/include/asm/preempt.h:80 [inline]
RIP: 0010:rcu_is_watching+0x5/0xa0 kernel/rcu/tree.c:1122
Code: 44 24 70 75 1b 48 8d 65 e8 5b 41 5e 41 5f 5d c3 e8 a0 99 57 08 41 f7 c7 00 02 00 00 75 bd eb bc e8 80 99 57 08 41 57 41 56 53 <65> ff 05 7c a0 9d 7e e8 7f a9 57 08 89 c3 83 f8 08 73 5c 49 bf 00
RSP: 0018:ffffc90002dbf8e0 EFLAGS: 00000257
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff815d0086
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8d89e368
RBP: ffffc90002dbfa18 R08: ffffffff8d89e36f R09: 1ffffffff1b13c6d
R10: dffffc0000000000 R11: fffffbfff1b13c6e R12: ffff8880794427a8
R13: 1ffff920005b7f2c R14: 0000000000000000 R15: dffffc0000000000
 trace_lock_acquire include/trace/events/lock.h:13 [inline]
 lock_acquire+0xc8/0x400 kernel/locking/lockdep.c:5594
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:364 [inline]
 task_lock include/linux/sched/task.h:199 [inline]
 switch_task_namespaces kernel/nsproxy.c:243 [inline]
 exit_task_namespaces+0x34/0xc0 kernel/nsproxy.c:254
 do_exit+0x621/0x20c0 kernel/exit.c:882
 do_group_exit+0x12e/0x300 kernel/exit.c:997
 get_signal+0x6ca/0x12c0 kernel/signal.c:2900
 arch_do_signal_or_restart+0xe7/0x12c0 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x493de3
Code: Unable to access opcode bytes at RIP 0x493db9.
RSP: 002b:00000929761ebcd8 EFLAGS: 00000286 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 0000000000000000 RCX: 0000000000493de3
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000929761d0960
RBP: 00000929761ebd20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000286 R12: 00000929761ebd30
R13: 0000092978efa160 R14: 0000092976160b40 R15: ffffffffffffffff
 </TASK>
----------------
Code disassembly (best guess):
   0:	44 24 70             	rex.R and $0x70,%al
   3:	75 1b                	jne    0x20
   5:	48 8d 65 e8          	lea    -0x18(%rbp),%rsp
   9:	5b                   	pop    %rbx
   a:	41 5e                	pop    %r14
   c:	41 5f                	pop    %r15
   e:	5d                   	pop    %rbp
   f:	c3                   	ret
  10:	e8 a0 99 57 08       	call   0x85799b5
  15:	41 f7 c7 00 02 00 00 	test   $0x200,%r15d
  1c:	75 bd                	jne    0xffffffdb
  1e:	eb bc                	jmp    0xffffffdc
  20:	e8 80 99 57 08       	call   0x85799a5
  25:	41 57                	push   %r15
  27:	41 56                	push   %r14
  29:	53                   	push   %rbx
* 2a:	65 ff 05 7c a0 9d 7e 	incl   %gs:0x7e9da07c(%rip)        # 0x7e9da0ad <-- trapping instruction
  31:	e8 7f a9 57 08       	call   0x857a9b5
  36:	89 c3                	mov    %eax,%ebx
  38:	83 f8 08             	cmp    $0x8,%eax
  3b:	73 5c                	jae    0x99
  3d:	49                   	rex.WB
  3e:	bf                   	.byte 0xbf