------------[ cut here ]------------
WARNING: CPU: 1 PID: 11448 at mm/maccess.c:226 copy_from_user_nofault+0x160/0x1c0 mm/maccess.c:226
Modules linked in:
CPU: 1 PID: 11448 Comm: syz.9.2822 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:copy_from_user_nofault+0x160/0x1c0 mm/maccess.c:226
Code: 24 45 31 f6 31 ff 89 de e8 7d 94 d8 ff 85 db 48 c7 c0 f2 ff ff ff 49 0f 44 c6 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 00 91 d8 ff <0f> 0b e9 1c ff ff ff 44 89 e1 80 e1 07 80 c1 03 38 c1 0f 8c ea fe
RSP: 0018:ffffc90000dd09d8 EFLAGS: 00010246
RAX: ffffffff81a07ea0 RBX: 0000000000000008 RCX: ffff88802a82bb80
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff88802a82bb87 R09: 1ffff11005505770
R10: dffffc0000000000 R11: ffffed1005505771 R12: ffff88802a82d308
R13: 00007ffffffff000 R14: ffffc90000dd0a48 R15: 0000000000000000
FS: 00007ffa41fe96c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000007b82a000 CR4: 00000000003506e0
DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff3 DR7: 0000000000000600
Call Trace:
bpf_probe_read_user_common kernel/trace/bpf_trace.c:157 [inline]
____bpf_probe_read_compat kernel/trace/bpf_trace.c:281 [inline]
bpf_probe_read_compat+0xdd/0x170 kernel/trace/bpf_trace.c:277
bpf_prog_ea44d77e194c9431+0x35/0x8c8
bpf_dispatcher_nop_func include/linux/bpf.h:888 [inline]
__bpf_prog_run include/linux/filter.h:628 [inline]
bpf_prog_run include/linux/filter.h:635 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:1878 [inline]
bpf_trace_run3+0x19e/0x350 kernel/trace/bpf_trace.c:1916
__bpf_trace_kmem_cache_free+0x99/0xc0 include/trace/events/kmem.h:138
trace_kmem_cache_free include/trace/events/kmem.h:138 [inline]
kmem_cache_free+0x1e7/0x210 mm/slub.c:3521
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
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:on_stack arch/x86/include/asm/stacktrace.h:58 [inline]
RIP: 0010:stack_access_ok arch/x86/kernel/unwind_orc.c:347 [inline]
RIP: 0010:deref_stack_reg arch/x86/kernel/unwind_orc.c:357 [inline]
RIP: 0010:unwind_next_frame+0x94b/0x1d90 arch/x86/kernel/unwind_orc.c:539
Code: 3c 28 00 74 05 e8 15 0e 89 00 48 8b 44 24 08 4c 8d 78 f8 4c 8b 6b 10 48 b8 00 00 00 00 00 fc ff df 48 8b 4c 24 48 0f b6 04 01 <84> c0 0f 85 b7 0f 00 00 83 3b 00 0f 95 c0 4d 39 fe 0f 96 c1 20 c1
RSP: 0018:ffffc90002edf128 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc90002edf1e8 RCX: 1ffff920005dbe3d
RDX: 1ffffffff1c65667 RSI: ffffffff8e32b336 RDI: ffffc90002edf1f8
RBP: ffffc90002edf230 R08: 0000000000000001 R09: 000000000000000b
R10: dffffc0000000000 R11: fffff520005dbe49 R12: 1ffffffff1c65667
R13: ffffc90002ee0000 R14: ffffc90002ed8000 R15: ffffc90002edfaa8
arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa6/0xf0 kernel/stacktrace.c:122
save_stack+0x121/0x230 mm/page_owner.c:119
__reset_page_owner+0x51/0x180 mm/page_owner.c:140
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1340 [inline]
free_pcp_prepare mm/page_alloc.c:1391 [inline]
free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317
free_unref_page+0x8f/0x2a0 mm/page_alloc.c:3396
free_slab mm/slub.c:2020 [inline]
discard_slab mm/slub.c:2026 [inline]
__unfreeze_partials+0x1a5/0x200 mm/slub.c:2512
put_cpu_partial+0x12d/0x190 mm/slub.c:2592
qlist_free_all+0x35/0x90 mm/kasan/quarantine.c:176
kasan_quarantine_reduce+0x150/0x160 mm/kasan/quarantine.c:283
__kasan_slab_alloc+0x2f/0xd0 mm/kasan/common.c:444
kasan_slab_alloc include/linux/kasan.h:254 [inline]
slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519
slab_alloc_node mm/slub.c:3225 [inline]
kmem_cache_alloc_node+0x12d/0x2d0 mm/slub.c:3261
__alloc_skb+0xf4/0x750 net/core/skbuff.c:415
alloc_skb include/linux/skbuff.h:1162 [inline]
alloc_uevent_skb+0x7d/0x230 lib/kobject_uevent.c:290
uevent_net_broadcast_tagged lib/kobject_uevent.c:351 [inline]
kobject_uevent_net_broadcast+0x17e/0x530 lib/kobject_uevent.c:412
kobject_uevent_env+0x556/0x890 lib/kobject_uevent.c:608
__kobject_del+0xd2/0x2f0 lib/kobject.c:625
kobject_cleanup lib/kobject.c:704 [inline]
kobject_release lib/kobject.c:744 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x235/0x460 lib/kobject.c:761
netdev_queue_update_kobjects+0x382/0x3e0 net/core/net-sysfs.c:1726
netif_set_real_num_tx_queues+0x15c/0x840 net/core/dev.c:2971
tun_set_real_num_queues drivers/net/tun.c:590 [inline]
__tun_detach+0xbd2/0x1500 drivers/net/tun.c:674
tun_set_queue drivers/net/tun.c:2941 [inline]
__tun_chr_ioctl+0xaf6/0x1ec0 drivers/net/tun.c:3045
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7ffa43d8dcb9
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:00007ffa41fe9028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffa44008fa0 RCX: 00007ffa43d8dcb9
RDX: 00002000000001c0 RSI: 00000000400454d9 RDI: 0000000000000005
RBP: 00007ffa43dfbbf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffa44009038 R14: 00007ffa44008fa0 R15: 00007fff330881e8
----------------
Code disassembly (best guess):
0: 3c 28 cmp $0x28,%al
2: 00 74 05 e8 add %dh,-0x18(%rbp,%rax,1)
6: 15 0e 89 00 48 adc $0x4800890e,%eax
b: 8b 44 24 08 mov 0x8(%rsp),%eax
f: 4c 8d 78 f8 lea -0x8(%rax),%r15
13: 4c 8b 6b 10 mov 0x10(%rbx),%r13
17: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
1e: fc ff df
21: 48 8b 4c 24 48 mov 0x48(%rsp),%rcx
26: 0f b6 04 01 movzbl (%rcx,%rax,1),%eax
* 2a: 84 c0 test %al,%al <-- trapping instruction
2c: 0f 85 b7 0f 00 00 jne 0xfe9
32: 83 3b 00 cmpl $0x0,(%rbx)
35: 0f 95 c0 setne %al
38: 4d 39 fe cmp %r15,%r14
3b: 0f 96 c1 setbe %cl
3e: 20 c1 and %al,%cl