Re: [moderation/CI] Re: bpf: Introduce static-defined tracing probe for BPF

#syz upstream

On Sat, Jun 27, 2026 at 9:07 PM syzbot ci
<[email protected]> wrote:
>
> syzbot ci has tested the following series
>
> [v1] bpf: Introduce static-defined tracing probe for BPF
> https://lore.kernel.org/all/[email protected]
> * [RFC PATCH bpf-next 01/12] libbpf: Prepare bpf SDT probe section for the linker
> * [RFC PATCH bpf-next 02/12] libbpf: Introduce bpf SDT probe macros
> * [RFC PATCH bpf-next 03/12] libbpf: Add bpf_sdt_notes section parser
> * [RFC PATCH bpf-next 04/12] bpf: Create insn_array map for bpf SDT probe
> * [RFC PATCH bpf-next 05/12] bpf: Collect SDT probe BTF IDs from BTF decl tags
> * [RFC PATCH bpf-next 06/12] bpf: Add type check for SDT probe site
> * [RFC PATCH bpf-next 07/12] bpf: Record probe name in SDT map
> * [RFC PATCH bpf-next 08/12] libbpf: Add libbpf support to load SDT observer program
> * [RFC PATCH bpf-next 09/12] bpf: Add kernel support to load SDT observer program
> * [RFC PATCH bpf-next 10/12] bpf: Support attach and detach for SDT observer program
> * [RFC PATCH bpf-next 11/12] bpf, x86: Add JIT support SDT for probe
> * [RFC PATCH bpf-next 12/12] selftests/bpf: Add tests for bpf SDT probe
>
> and found the following issue:
> general protection fault in do_jit
>
> Full report is available here:
> https://ci.syzbot.org/series/86d21ab6-d0e1-4dd3-b7e1-af4571d27460
>
> ***
>
> general protection fault in do_jit
>
> tree:      bpf-next
> URL:       https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next.git
> base:      53435562a725962e4de0c29653223129ba11643a
> arch:      amd64
> compiler:  Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6
> config:    https://ci.syzbot.org/builds/549153a4-d4b8-46a4-8266-df26ad835e2f/config
> syz repro: https://ci.syzbot.org/findings/2efaa7e4-eae0-45d0-b336-f0e311f8356e/syz_repro
>
> Oops: general protection fault, probably for non-canonical address 0xdffffc000000010e: 0000 [#1] SMP KASAN PTI
> KASAN: null-ptr-deref in range [0x0000000000000870-0x0000000000000877]
> CPU: 1 UID: 0 PID: 5818 Comm: syz.2.19 Not tainted syzkaller #0 PREEMPT(full)
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
> RIP: 0010:do_jit+0x7c8c/0x12a90 arch/x86/net/bpf_jit_comp.c:2806
> Code: 49 83 c4 44 4c 89 e0 48 c1 e8 03 0f b6 04 10 84 c0 0f 85 0a 84 00 00 45 03 34 24 48 8b bc 24 a0 01 00 00 48 89 f8 48 c1 e8 03 <80> 3c 10 00 74 17 e8 49 30 b0 00 48 8b bc 24 a0 01 00 00 48 ba 00
> RSP: 0018:ffffc900038cf640 EFLAGS: 00010202
> RAX: 000000000000010e RBX: 000000000000001c RCX: 0000000000000000
> RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000870
> RBP: ffffc900038cfa00 R08: ffff88816bb0d940 R09: 0000000000000096
> R10: 00000000000000fb R11: 0000000000000000 R12: ffff8881749b8044
> R13: ffff88816c445450 R14: 0000000000000003 R15: 0000000000000000
> FS:  00007f06814986c0(0000) GS:ffff8882a9224000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f0680472780 CR3: 000000001cfc8000 CR4: 00000000000006f0
> Call Trace:
>  <TASK>
>  bpf_int_jit_compile+0x8af/0x1620 arch/x86/net/bpf_jit_comp.c:3946
>  bpf_prog_jit_compile kernel/bpf/core.c:2571 [inline]
>  __bpf_prog_select_runtime+0x4e2/0xb20 kernel/bpf/core.c:2640
>  bpf_migrate_filter net/core/filter.c:1318 [inline]
>  bpf_prepare_filter+0x10ef/0x1280 net/core/filter.c:1366
>  sk_attach_filter+0x24/0x140 net/core/filter.c:1550
>  tun_attach_filter+0x176/0x280 drivers/net/tun.c:2992
>  __tun_chr_ioctl+0x15f1/0x1e10 drivers/net/tun.c:3344
>  vfs_ioctl fs/ioctl.c:51 [inline]
>  __do_sys_ioctl fs/ioctl.c:597 [inline]
>  __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
>  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
>  do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7f068059ce59
> 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:00007f0681498028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
> RAX: ffffffffffffffda RBX: 00007f0680815fa0 RCX: 00007f068059ce59
> RDX: 0000200000000300 RSI: 00000000401054d5 RDI: 0000000000000003
> RBP: 00007f0680632e6f R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
> R13: 00007f0680816038 R14: 00007f0680815fa0 R15: 00007fff056e7c98
>  </TASK>
> Modules linked in:
> ---[ end trace 0000000000000000 ]---
> RIP: 0010:do_jit+0x7c8c/0x12a90 arch/x86/net/bpf_jit_comp.c:2806
> Code: 49 83 c4 44 4c 89 e0 48 c1 e8 03 0f b6 04 10 84 c0 0f 85 0a 84 00 00 45 03 34 24 48 8b bc 24 a0 01 00 00 48 89 f8 48 c1 e8 03 <80> 3c 10 00 74 17 e8 49 30 b0 00 48 8b bc 24 a0 01 00 00 48 ba 00
> RSP: 0018:ffffc900038cf640 EFLAGS: 00010202
> RAX: 000000000000010e RBX: 000000000000001c RCX: 0000000000000000
> RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000870
> RBP: ffffc900038cfa00 R08: ffff88816bb0d940 R09: 0000000000000096
> R10: 00000000000000fb R11: 0000000000000000 R12: ffff8881749b8044
> R13: ffff88816c445450 R14: 0000000000000003 R15: 0000000000000000
> FS:  00007f06814986c0(0000) GS:ffff8882a9224000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f06805ea540 CR3: 000000001cfc8000 CR4: 00000000000006f0
> ----------------
> Code disassembly (best guess):
>    0:   49 83 c4 44             add    $0x44,%r12
>    4:   4c 89 e0                mov    %r12,%rax
>    7:   48 c1 e8 03             shr    $0x3,%rax
>    b:   0f b6 04 10             movzbl (%rax,%rdx,1),%eax
>    f:   84 c0                   test   %al,%al
>   11:   0f 85 0a 84 00 00       jne    0x8421
>   17:   45 03 34 24             add    (%r12),%r14d
>   1b:   48 8b bc 24 a0 01 00    mov    0x1a0(%rsp),%rdi
>   22:   00
>   23:   48 89 f8                mov    %rdi,%rax
>   26:   48 c1 e8 03             shr    $0x3,%rax
> * 2a:   80 3c 10 00             cmpb   $0x0,(%rax,%rdx,1) <-- trapping instruction
>   2e:   74 17                   je     0x47
>   30:   e8 49 30 b0 00          call   0xb0307e
>   35:   48 8b bc 24 a0 01 00    mov    0x1a0(%rsp),%rdi
>   3c:   00
>   3d:   48                      rex.W
>   3e:   ba                      .byte 0xba
>
>
> ***
>
> If these findings have caused you to resend the series or submit a
> separate fix, please add the following tag to your commit message:
>   Tested-by: [email protected]
>
> ---
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