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f61b8fecec
[ Upstream commit 5f55f2168432298f5a55294831ab6a76a10cb3c3 ]
Currently a crash in a leaf prog (caused by a bug) produces the
following call trace:
[<000003ff600ebf00>] bpf_prog_6df0139e1fbf2789_fentry+0x20/0x78
[<0000000000000000>] 0x0
This is because leaf progs do not store backchain. Fix by making all
progs do it. This is what GCC and Clang-generated code does as well.
Now the call trace looks like this:
[<000003ff600eb0f2>] bpf_prog_6df0139e1fbf2789_fentry+0x2a/0x80
[<000003ff600ed096>] bpf_trampoline_201863462940+0x96/0xf4
[<000003ff600e3a40>] bpf_prog_05f379658fdd72f2_classifier_0+0x58/0xc0
[<000003ffe0aef070>] bpf_test_run+0x210/0x390
[<000003ffe0af0dc2>] bpf_prog_test_run_skb+0x25a/0x668
[<000003ffe038a90e>] __sys_bpf+0xa46/0xdb0
[<000003ffe038ad0c>] __s390x_sys_bpf+0x44/0x50
[<000003ffe0defea8>] __do_syscall+0x150/0x280
[<000003ffe0e01d5c>] system_call+0x74/0x98
Fixes: 0546231057 ("s390/bpf: Add s390x eBPF JIT compiler backend")
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Link: https://lore.kernel.org/r/20250512122717.54878-1-iii@linux.ibm.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.