------------[ cut here ]------------
WARNING: CPU: 1 PID: 4941 at mm/maccess.c:226 copy_from_user_nofault+0x160/0x1c0 mm/maccess.c:226
Modules linked in:
CPU: 1 PID: 4941 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:copy_from_user_nofault+0x160/0x1c0 mm/maccess.c:226
Code: 24 45 31 f6 31 ff 89 de e8 fd 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 80 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:ffffc90000dd0af8 EFLAGS: 00010046
RAX: ffffffff81a08f90 RBX: 0000000000000008 RCX: ffff88807e8f0000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff88807e8f0007 R09: 1ffff1100fd1e000
R10: dffffc0000000000 R11: ffffed100fd1e001 R12: ffff88807e8f1788
R13: 00007ffffffff000 R14: ffffc90000dd0b68 R15: 0000000041c40000
FS: 0000555582df0500(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3015ffff CR3: 0000000023c73000 CR4: 00000000003506e0
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_compat kernel/trace/bpf_trace.c:281 [inline]
bpf_probe_read_compat+0xdd/0x170 kernel/trace/bpf_trace.c:277
bpf_prog_afd39f2fb06795e3+0x3b/0xd78
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_run2+0x163/0x2e0 kernel/trace/bpf_trace.c:1915
trace_hrtimer_start include/trace/events/timer.h:199 [inline]
debug_activate kernel/time/hrtimer.c:466 [inline]
enqueue_hrtimer+0x314/0x370 kernel/time/hrtimer.c:1069
__run_hrtimer kernel/time/hrtimer.c:1702 [inline]
__hrtimer_run_queues+0x5fa/0xb70 kernel/time/hrtimer.c:1749
hrtimer_run_softirq+0x176/0x240 kernel/time/hrtimer.c:1766
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:unwind_next_frame+0xbc/0x1d90 arch/x86/kernel/unwind_orc.c:436
Code: ac 24 80 00 00 00 4c 89 64 24 58 4c 89 7c 24 48 bf 01 00 00 00 e8 64 53 1d 00 4c 8d 7b 50 4c 89 f8 48 c1 e8 03 48 89 44 24 30 <42> 80 3c 30 00 74 08 4c 89 ff e8 25 1f 89 00 4c 89 7c 24 28 4d 8b
RSP: 0018:ffffc9000333ee08 EFLAGS: 00000a02
RAX: 1ffff92000667de3 RBX: ffffc9000333eec8 RCX: ffffffff962daf00
RDX: dffffc0000000000 RSI: ffffffff81cb6e94 RDI: ffffffff81350d2c
RBP: ffffc9000333ef10 R08: ffffc9000333ef90 R09: 0000000000000005
R10: dffffc0000000000 R11: fffff52000667de5 R12: ffffffff81cb6e94
R13: ffffc9000333f420 R14: dffffc0000000000 R15: ffffc9000333ef18
arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa6/0xf0 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:3225 [inline]
slab_alloc mm/slub.c:3233 [inline]
kmem_cache_alloc+0x100/0x290 mm/slub.c:3238
__d_alloc+0x2a/0x6f0 fs/dcache.c:1749
d_alloc fs/dcache.c:1828 [inline]
d_alloc_parallel+0x7b/0x1330 fs/dcache.c:2584
__lookup_slow+0x134/0x410 fs/namei.c:1656
lookup_one_len+0x19d/0x2d0 fs/namei.c:2726
start_creating+0x184/0x310 fs/debugfs/inode.c:354
__debugfs_create_file+0x6f/0x510 fs/debugfs/inode.c:399
nsim_bpf_dev_init+0x1b2/0x240 drivers/net/netdevsim/bpf.c:604
nsim_dev_probe+0x6fc/0x9c0 drivers/net/netdevsim/dev.c:1505
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x284/0xc80 drivers/base/dd.c:595
__driver_probe_device+0x18c/0x330 drivers/base/dd.c:755
driver_probe_device+0x4f/0x420 drivers/base/dd.c:785
__device_attach_driver+0x2b0/0x500 drivers/base/dd.c:907
bus_for_each_drv+0x184/0x210 drivers/base/bus.c:429
__device_attach+0x2a8/0x480 drivers/base/dd.c:979
bus_probe_device+0xbc/0x1e0 drivers/base/bus.c:489
device_add+0xa00/0xfb0 drivers/base/core.c:3412
nsim_bus_dev_new drivers/net/netdevsim/bus.c:435 [inline]
new_device_store+0x3e8/0x760 drivers/net/netdevsim/bus.c:302
kernfs_fop_write_iter+0x379/0x4c0 fs/kernfs/file.c:296
call_write_iter include/linux/fs.h:2173 [inline]
new_sync_write fs/read_write.c:507 [inline]
vfs_write+0x745/0xd60 fs/read_write.c:594
ksys_write+0x152/0x260 fs/read_write.c:647
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: 0033:0x7f2fd7e1f98e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007ffd25d220a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000555582df0500 RCX: 00007f2fd7e1f98e
RDX: 0000000000000003 RSI: 00007ffd25d22130 RDI: 0000000000000005
RBP: 00007f2fd7ef2231 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00007ffd25d22130 R14: 00007f2fd8bba620 R15: 0000000000000003
----------------
Code disassembly (best guess):
0: ac lods %ds:(%rsi),%al
1: 24 80 and $0x80,%al
3: 00 00 add %al,(%rax)
5: 00 4c 89 64 add %cl,0x64(%rcx,%rcx,4)
9: 24 58 and $0x58,%al
b: 4c 89 7c 24 48 mov %r15,0x48(%rsp)
10: bf 01 00 00 00 mov $0x1,%edi
15: e8 64 53 1d 00 call 0x1d537e
1a: 4c 8d 7b 50 lea 0x50(%rbx),%r15
1e: 4c 89 f8 mov %r15,%rax
21: 48 c1 e8 03 shr $0x3,%rax
25: 48 89 44 24 30 mov %rax,0x30(%rsp)
* 2a: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 4c 89 ff mov %r15,%rdi
34: e8 25 1f 89 00 call 0x891f5e
39: 4c 89 7c 24 28 mov %r15,0x28(%rsp)
3e: 4d rex.WRB
3f: 8b .byte 0x8b