------------[ cut here ]------------
sk->sk_forward_alloc
WARNING: net/ipv4/af_inet.c:162 at inet_sock_destruct+0x62b/0x740 net/ipv4/af_inet.c:162, CPU#0: syz.0.2376/15159
Modules linked in:
CPU: 0 UID: 0 PID: 15159 Comm: syz.0.2376 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:inet_sock_destruct+0x62b/0x740 net/ipv4/af_inet.c:162
Code: 0f 0b 90 e9 58 fe ff ff e8 e2 8d 95 f7 90 0f 0b 90 e9 8b fe ff ff e8 d4 8d 95 f7 90 0f 0b 90 e9 b1 fe ff ff e8 c6 8d 95 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: 0000:ffffc90000007d28 EFLAGS: 00010246
RAX: ffffffff8a30e3ba RBX: dffffc0000000000 RCX: ffff888030843e00
RDX: 0000000000000100 RSI: 0000000000000f70 RDI: 0000000000000000
RBP: 0000000000000f70 R08: ffff88806b1d7127 R09: 1ffff1100d63ae24
R10: dffffc0000000000 R11: ffffed100d63ae25 R12: ffff88806b1d6e80
R13: dffffc0000000000 R14: ffff88806b1d710c R15: ffffffff8fecb840
FS: 000055556f177500(0000) GS:ffff888125226000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbbb03d0680 CR3: 000000007c398000 CR4: 00000000003526f0
Call Trace:
__sk_destruct+0x89/0x9d0 net/core/sock.c:2357
rcu_do_batch kernel/rcu/tree.c:2645 [inline]
rcu_core+0x78b/0x10a0 kernel/rcu/tree.c:2897
handle_softirqs+0x225/0x840 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:1062 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline]
RIP: 0010:rcu_is_watching+0x3a/0xb0 kernel/rcu/tree.c:752
Code: e8 fb 74 08 0a 89 c3 83 f8 08 73 65 49 bf 00 00 00 00 00 fc ff df 4c 8d 34 dd d0 27 2a 8e 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 <74> 08 4c 89 f7 e8 1c b6 88 00 48 c7 c3 d8 d8 40 93 49 03 1e 48 89
RSP: 0000:ffffc9001b7df118 EFLAGS: 00000246
RAX: 1ffffffff1c544fa RBX: 0000000000000000 RCX: 0000000080000001
RDX: 000000004b1c6911 RSI: ffffffff8c2a9f60 RDI: ffffffff8c2a9f20
RBP: 0000000000000000 R08: ffffffff81afdc0d R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8e959c20 R12: ffff888030843e00
R13: ffffffff81afdc0d R14: ffffffff8e2a27d0 R15: dffffc0000000000
trace_lock_release include/trace/events/lock.h:68 [inline]
lock_release+0x4b/0x3c0 kernel/locking/lockdep.c:5879
rcu_lock_release include/linux/rcupdate.h:310 [inline]
rcu_read_unlock include/linux/rcupdate.h:871 [inline]
class_rcu_destructor include/linux/rcupdate.h:1183 [inline]
is_module_text_address+0x18b/0x1e0 kernel/module/main.c:3923
kernel_text_address+0x94/0xe0 kernel/extable.c:119
__kernel_text_address+0xd/0x30 kernel/extable.c:79
unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:385
arch_stack_walk+0xfb/0x150 arch/x86/kernel/stacktrace.c:26
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
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2705 [inline]
slab_free mm/slub.c:6405 [inline]
kmem_cache_free+0x182/0x650 mm/slub.c:6532
netlink_broadcast_filtered+0xd9d/0xea0 net/netlink/af_netlink.c:1541
nlmsg_multicast_filtered include/net/netlink.h:1165 [inline]
nlmsg_multicast include/net/netlink.h:1184 [inline]
nlmsg_notify+0xe3/0x1a0 net/netlink/af_netlink.c:2599
unregister_netdevice_many_notify+0x1b38/0x2150 net/core/dev.c:12466
vlan_device_event+0x143d/0x1580 net/8021q/vlan.c:455
notifier_call_chain+0x1a5/0x3d0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2288 [inline]
call_netdevice_notifiers net/core/dev.c:2302 [inline]
unregister_netdevice_many_notify+0x17de/0x2150 net/core/dev.c:12440
unregister_netdevice_many net/core/dev.c:12501 [inline]
unregister_netdevice_queue+0x2f5/0x340 net/core/dev.c:12313
unregister_netdevice include/linux/netdevice.h:3472 [inline]
__tun_detach+0x1018/0x1880 drivers/net/tun.c:628
tun_detach drivers/net/tun.c:644 [inline]
tun_chr_close+0x10a/0x1c0 drivers/net/tun.c:3506
__fput+0x418/0xa50 fs/file_table.c:512
task_work_run+0x1d9/0x270 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:70 [inline]
exit_to_user_mode_loop+0x1fa/0x730 kernel/entry/common.c:101
__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:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
do_syscall_64+0x353/0x580 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1d0719de59
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:00007ffd6d59eab8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f1d07427da0 RCX: 00007f1d0719de59
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f1d07427da0 R08: 00007f1d07426038 R09: 0000000000000000
R10: 00000000003fcc90 R11: 0000000000000246 R12: 0000000000056ff7
R13: 00007f1d0742609c R14: 0000000000056d65 R15: 00007ffd6d59ebc0
----------------
Code disassembly (best guess):
0: e8 fb 74 08 0a call 0xa087500
5: 89 c3 mov %eax,%ebx
7: 83 f8 08 cmp $0x8,%eax
a: 73 65 jae 0x71
c: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15
13: fc ff df
16: 4c 8d 34 dd d0 27 2a lea -0x71d5d830(,%rbx,8),%r14
1d: 8e
1e: 4c 89 f0 mov %r14,%rax
21: 48 c1 e8 03 shr $0x3,%rax
25: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1)
* 2a: 74 08 je 0x34 <-- trapping instruction
2c: 4c 89 f7 mov %r14,%rdi
2f: e8 1c b6 88 00 call 0x88b650
34: 48 c7 c3 d8 d8 40 93 mov $0xffffffff9340d8d8,%rbx
3b: 49 03 1e add (%r14),%rbx
3e: 48 rex.W
3f: 89 .byte 0x89