------------[ cut here ]------------
WARNING: CPU: 1 PID: 8721 at mm/maccess.c:226 copy_from_user_nofault+0x160/0x1c0 mm/maccess.c:226
Modules linked in:
CPU: 1 PID: 8721 Comm: syz.2.1103 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:copy_from_user_nofault+0x160/0x1c0 mm/maccess.c:226
Code: 24 45 31 f6 31 ff 89 de e8 ed f6 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 70 f3 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:ffffc90000dd09c8 EFLAGS: 00010246
RAX: ffffffff819ed740 RBX: 0000000000000008 RCX: ffff888025163b80
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: dffffc0000000000 R09: fffffbfff1ff7619
R10: fffffbfff1ff7619 R11: 1ffffffff1ff7618 R12: ffff888025165308
R13: 1ffff920001ba148 R14: ffffc90000dd0a28 R15: 0000000000000000
FS: 00007fd55cba36c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001000 CR3: 000000007a6e1000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
bpf_probe_read_user_common kernel/trace/bpf_trace.c:157 [inline]
____bpf_probe_read_user kernel/trace/bpf_trace.c:166 [inline]
bpf_probe_read_user+0x26/0x70 kernel/trace/bpf_trace.c:163
bpf_prog_d20f016a5d369cb4+0x35/0x48c
bpf_dispatcher_nop_func include/linux/bpf.h:790 [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+0x17e/0x320 kernel/trace/bpf_trace.c:1916
__bpf_trace_kmem_cache_free+0x99/0xc0 include/trace/events/kmem.h:138
__traceiter_kmem_cache_free+0x30/0x50 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:3516
rcu_do_batch kernel/rcu/tree.c:2523 [inline]
rcu_core+0x962/0x15d0 kernel/rcu/tree.c:2763
handle_softirqs+0x328/0x820 kernel/softirq.c:576
__do_softirq kernel/softirq.c:610 [inline]
invoke_softirq kernel/softirq.c:450 [inline]
__irq_exit_rcu+0x12f/0x220 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:preempt_latency_start kernel/sched/core.c:5492 [inline]
RIP: 0010:preempt_count_add+0xa2/0x190 kernel/sched/core.c:5515
Code: ff ff ff 7f 39 f8 75 42 48 8b 5c 24 18 48 89 df e8 73 b5 0b 00 85 c0 74 09 31 db 31 ff e8 66 b5 0b 00 65 4c 8b 35 ee fe b0 7e <49> 81 c6 e8 14 00 00 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 74 08 4c
RSP: 0018:ffffc90002ccf608 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffffff8134790c RCX: ffffffff960c1f00
RDX: dffffc0000000000 RSI: ffffffff81bb846c RDI: ffffffff8134790c
RBP: ffffc90002ccf730 R08: ffffc90002ccf7b0 R09: 0000000000000001
R10: fffff52000599ee9 R11: 1ffff92000599ee7 R12: ffffffff81bb846c
R13: ffffc90002ccfa68 R14: ffff888025163b80 R15: dffffc0000000000
unwind_next_frame+0xac/0x1d90 arch/x86/kernel/unwind_orc.c:433
arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x98/0xe0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
__kasan_slab_alloc+0x9c/0xd0 mm/kasan/common.c:467
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:3220 [inline]
slab_alloc mm/slub.c:3228 [inline]
kmem_cache_alloc+0x100/0x290 mm/slub.c:3233
sched_create_group+0x19/0x80 kernel/sched/core.c:9859
cpu_cgroup_css_alloc+0xa/0x30 kernel/sched/core.c:10012
css_create kernel/cgroup/cgroup.c:5365 [inline]
cgroup_apply_control_enable+0x3cc/0xb00 kernel/cgroup/cgroup.c:3189
cgroup_mkdir+0xc67/0xe60 kernel/cgroup/cgroup.c:5585
kernfs_iop_mkdir+0x24c/0x3d0 fs/kernfs/dir.c:1175
vfs_mkdir+0x387/0x570 fs/namei.c:4065
do_mkdirat+0x1d7/0x5a0 fs/namei.c:4090
__do_sys_mkdir fs/namei.c:4110 [inline]
__se_sys_mkdir fs/namei.c:4108 [inline]
__x64_sys_mkdir+0x6a/0x80 fs/namei.c:4108
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: 0033:0x7fd55e93bbe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd55cba3038 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007fd55eb72fa0 RCX: 00007fd55e93bbe9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000000
RBP: 00007fd55e9bee19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd55eb73038 R14: 00007fd55eb72fa0 R15: 00007ffc622f5d28
----------------
Code disassembly (best guess), 3 bytes skipped:
0: 7f 39 jg 0x3b
2: f8 clc
3: 75 42 jne 0x47
5: 48 8b 5c 24 18 mov 0x18(%rsp),%rbx
a: 48 89 df mov %rbx,%rdi
d: e8 73 b5 0b 00 call 0xbb585
12: 85 c0 test %eax,%eax
14: 74 09 je 0x1f
16: 31 db xor %ebx,%ebx
18: 31 ff xor %edi,%edi
1a: e8 66 b5 0b 00 call 0xbb585
1f: 65 4c 8b 35 ee fe b0 mov %gs:0x7eb0feee(%rip),%r14 # 0x7eb0ff15
26: 7e
* 27: 49 81 c6 e8 14 00 00 add $0x14e8,%r14 <-- trapping instruction
2e: 4c 89 f0 mov %r14,%rax
31: 48 c1 e8 03 shr $0x3,%rax
35: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1)
3a: 74 08 je 0x44
3c: 4c rex.WR