On Nov 18 2025, Menglong Dong wrote:

> Some places calculate the origin_call by checking if
> BPF_TRAMP_F_SKIP_FRAME is set. However, it should use
> BPF_TRAMP_F_ORIG_STACK for this propose. Just fix them.
>
> Signed-off-by: Menglong Dong <[email protected]>
> Acked-by: Alexei Starovoitov <[email protected]>

This breaks RISC-V:

[    8.584381][    T1] systemd[1]: bpf-restrict-fs: LSM BPF program attached
[    8.588359][    T1] Insufficient stack space to handle exception!
[    8.588823][    T1] Task stack:     [0xff20000000010000..0xff20000000014000]
[    8.589219][    T1] Overflow stack: [0xff600000ffdad070..0xff600000ffdae070]
[    8.590133][    T1] CPU: 1 UID: 0 PID: 1 Comm: systemd Not tainted 
6.18.0-rc5+ #15 PREEMPT(voluntary)  c900881ed1c1988ec5cf3e914d0edeb1b4d83ca3
[    8.590898][    T1] Hardware name: riscv-virtio qemu/qemu, BIOS 2025.10 
10/01/2025
[    8.591494][    T1] epc : copy_from_kernel_nofault+0xa/0x198
[    8.592292][    T1]  ra : bpf_probe_read_kernel+0x20/0x60
[    8.592658][    T1] epc : ffffffff802b732a ra : ffffffff801e6070 sp : 
ff2000000000ffe0
[    8.593121][    T1]  gp : ffffffff82262ed0 tp : 0000000000000000 t0 : 
ffffffff80022320
[    8.593566][    T1]  t1 : ffffffff801e6056 t2 : 0000000000000000 s0 : 
ff20000000010040
[    8.593997][    T1]  s1 : 0000000000000008 a0 : ff20000000010050 a1 : 
ff60000083b3d320
[    8.594446][    T1]  a2 : 0000000000000008 a3 : 0000000000000097 a4 : 
0000000000000000
[    8.594940][    T1]  a5 : 0000000000000000 a6 : 0000000000000021 a7 : 
0000000000000003
[    8.595396][    T1]  s2 : ff20000000010050 s3 : ff6000008459fc18 s4 : 
ff60000083b3d340
[    8.595831][    T1]  s5 : ff20000000010060 s6 : 0000000000000000 s7 : 
ff20000000013aa8
[    8.596215][    T1]  s8 : 0000000000000000 s9 : 0000000000008000 s10: 
000000000058dcb0
[    8.596641][    T1]  s11: 000000000058dca7 t3 : 000000006925116d t4 : 
ff6000008090f026
[    8.597065][    T1]  t5 : 00007fff9b0cbaa8 t6 : 0000000000000016
[    8.597363][    T1] status: 0000000200000120 badaddr: 0000000000000000 
cause: 8000000000000005
[    8.598033][    T1] Kernel panic - not syncing: Kernel stack overflow
[    8.598597][    T1] CPU: 1 UID: 0 PID: 1 Comm: systemd Not tainted 
6.18.0-rc5+ #15 PREEMPT(voluntary)  c900881ed1c1988ec5cf3e914d0edeb1b4d83ca3
[    8.599244][    T1] Hardware name: riscv-virtio qemu/qemu, BIOS 2025.10 
10/01/2025
[    8.599659][    T1] Call Trace:
[    8.600117][    T1] [<ffffffff8001a1f8>] dump_backtrace+0x28/0x38
[    8.600517][    T1] [<ffffffff80002502>] show_stack+0x3a/0x50
[    8.600844][    T1] [<ffffffff800122be>] dump_stack_lvl+0x56/0x80
[    8.601176][    T1] [<ffffffff80012300>] dump_stack+0x18/0x22
[    8.601518][    T1] [<ffffffff80002abe>] vpanic+0xf6/0x328
[    8.601819][    T1] [<ffffffff80002d2e>] panic+0x3e/0x40
[    8.602088][    T1] [<ffffffff80019ef0>] handle_bad_stack+0x98/0xa0
[    8.602395][    T1] [<ffffffff801e6070>] bpf_probe_read_kernel+0x20/0x60

-- 
Andreas Schwab, [email protected]
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."

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