------------[ cut here ]------------
WARNING: CPU: 0 PID: 4297 at mm/maccess.c:226 copy_from_user_nofault+0x160/0x1c0 mm/maccess.c:226
Modules linked in:
CPU: 0 PID: 4297 Comm: syz.2.3 Not tainted 5.15.189-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 f7 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 f4 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:ffffc90000007980 EFLAGS: 00010046
RAX: ffffffff819ecfb0 RBX: 0000000000000008 RCX: ffff88802b463b80
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: dffffc0000000000 R09: fffffbfff1ff6e19
R10: fffffbfff1ff6e19 R11: 1ffffffff1ff6e18 R12: ffff88802b465308
R13: dffffc0000000000 R14: ffffc900000079e8 R15: 0000000000000000
FS: 00007f6030e346c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f603304fdf1 CR3: 000000007d929000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
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_02073d59a3c0f06f+0x3d/0xa64
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_run1+0x153/0x2d0 kernel/trace/bpf_trace.c:1914
__traceiter_workqueue_activate_work+0x64/0xb0 include/trace/events/workqueue.h:59
trace_workqueue_activate_work+0x13e/0x1a0 include/trace/events/workqueue.h:59
__queue_work+0x8ec/0xd50 kernel/workqueue.c:1521
call_timer_fn+0x16c/0x530 kernel/time/timer.c:1451
expire_timers kernel/time/timer.c:1491 [inline]
__run_timers+0x550/0x7c0 kernel/time/timer.c:1767
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780
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:__should_failslab+0x0/0xe0 mm/failslab.c:18
Code: 62 03 00 00 00 00 00 49 c7 86 00 62 03 00 00 00 00 00 49 c7 86 10 62 03 00 00 00 00 00 31 c0 5b 41 5c 41 5e 41 5f c3 00 00 cc <55> 41 57 41 56 53 89 f5 48 89 fb 49 bf 00 00 00 00 00 fc ff df 48
RSP: 0018:ffffc900033cf5b0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc900033cf5f0 RCX: 277ef315ac66c500
RDX: ffff88802b463b80 RSI: 0000000000000dc0 RDI: ffff8881406f5640
RBP: 0000000000000dc0 R08: dffffc0000000000 R09: fffffbfff1ad2dd6
R10: fffffbfff1ad2dd6 R11: 1ffffffff1ad2dd5 R12: ffff8880219adce0
R13: ffffc900033cf718 R14: ffff8881406f5640 R15: 0000000000000001
should_failslab+0x5/0x20 mm/slab_common.c:1350
slab_pre_alloc_hook+0x51/0xc0 mm/slab.h:494
slab_alloc_node mm/slub.c:3134 [inline]
slab_alloc mm/slub.c:3228 [inline]
kmem_cache_alloc+0x3d/0x290 mm/slub.c:3233
kmem_cache_zalloc include/linux/slab.h:725 [inline]
__proc_create+0x36c/0x8c0 fs/proc/generic.c:426
proc_create_reg fs/proc/generic.c:553 [inline]
proc_create_data+0xa0/0x2d0 fs/proc/generic.c:579
create_cache_proc_entries net/sunrpc/cache.c:1676 [inline]
cache_register_net+0x27a/0x480 net/sunrpc/cache.c:1709
nfsd_export_init+0x157/0x1e0 fs/nfsd/export.c:1367
nfsd_init_net+0x2b/0x1c0 fs/nfsd/nfsctl.c:1455
ops_init+0x357/0x600 net/core/net_namespace.c:138
setup_net+0x38d/0x9f0 net/core/net_namespace.c:333
copy_net_ns+0x348/0x5b0 net/core/net_namespace.c:503
create_new_namespaces+0x3d3/0x6f0 kernel/nsproxy.c:110
copy_namespaces+0x37d/0x3e0 kernel/nsproxy.c:178
copy_process+0x180f/0x3e00 kernel/fork.c:2293
kernel_clone+0x219/0x930 kernel/fork.c:2679
__do_sys_clone kernel/fork.c:2796 [inline]
__se_sys_clone kernel/fork.c:2780 [inline]
__x64_sys_clone+0x170/0x1c0 kernel/fork.c:2780
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: 0033:0x7f6032fccb69
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:00007f6030e33fe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f60331f3fa0 RCX: 00007f6032fccb69
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000640c7000
RBP: 00007f603304fdf1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f60331f3fa0 R15: 00007ffdd6e31a48
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 03 00 add (%rax),%eax
2: 00 00 add %al,(%rax)
4: 00 00 add %al,(%rax)
6: 49 c7 86 00 62 03 00 movq $0x0,0x36200(%r14)
d: 00 00 00 00
11: 49 c7 86 10 62 03 00 movq $0x0,0x36210(%r14)
18: 00 00 00 00
1c: 31 c0 xor %eax,%eax
1e: 5b pop %rbx
1f: 41 5c pop %r12
21: 41 5e pop %r14
23: 41 5f pop %r15
25: c3 ret
26: 00 00 add %al,(%rax)
28: cc int3
* 29: 55 push %rbp <-- trapping instruction
2a: 41 57 push %r15
2c: 41 56 push %r14
2e: 53 push %rbx
2f: 89 f5 mov %esi,%ebp
31: 48 89 fb mov %rdi,%rbx
34: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15
3b: fc ff df
3e: 48 rex.W