Revision 3d2353de81061cab4b9d68b3e1dc69cbec1451ea authored by Steven Rostedt (VMware) on 13 May 2020, 19:18:01 UTC, committed by Steven Rostedt (VMware) on 14 May 2020, 12:50:51 UTC
If the function tracer is running and the trace file is read (which uses the ring buffer iterator), the iterator can get in sync with the writes, and caues it to fail to find a page with content it can read three times. This causes a warning and deactivation of the ring buffer code. Looking at the other cases of failure to get an event, it appears that there's a chance that the writer could cause them too. Since the iterator is a "best effort" to read the ring buffer if there's an active writer (the consumer reader is made for this case "see trace_pipe"), if it fails to get an event after three tries, simply give up and return NULL. Don't warn, nor disable the ring buffer on this failure. Link: https://lore.kernel.org/r/20200429090508.GG5770@shao2-debian Reported-by: kernel test robot <lkp@intel.com> Fixes: ff84c50cfb4b ("ring-buffer: Do not die if rb_iter_peek() fails more than thrice") Tested-by: Sven Schnelle <svens@linux.ibm.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
1 parent 59566b0
File | Mode | Size |
---|---|---|
atomic | ||
basic | ||
coccinelle | ||
dtc | ||
dummy-tools | ||
gcc-plugins | ||
gdb | ||
genksyms | ||
kconfig | ||
ksymoops | ||
mod | ||
package | ||
selinux | ||
tracing | ||
.gitignore | -rw-r--r-- | 139 bytes |
Kbuild.include | -rw-r--r-- | 12.2 KB |
Kconfig.include | -rw-r--r-- | 2.0 KB |
Lindent | -rwxr-xr-x | 502 bytes |
Makefile | -rw-r--r-- | 1.2 KB |
Makefile.asm-generic | -rw-r--r-- | 1.8 KB |
Makefile.build | -rw-r--r-- | 16.8 KB |
Makefile.clean | -rw-r--r-- | 2.2 KB |
Makefile.dtbinst | -rw-r--r-- | 933 bytes |
Makefile.extrawarn | -rw-r--r-- | 2.7 KB |
Makefile.gcc-plugins | -rw-r--r-- | 2.4 KB |
Makefile.headersinst | -rw-r--r-- | 2.9 KB |
Makefile.host | -rw-r--r-- | 5.9 KB |
Makefile.kasan | -rw-r--r-- | 1.4 KB |
Makefile.kcov | -rw-r--r-- | 359 bytes |
Makefile.lib | -rw-r--r-- | 15.0 KB |
Makefile.modfinal | -rw-r--r-- | 1.8 KB |
Makefile.modinst | -rw-r--r-- | 1.1 KB |
Makefile.modpost | -rw-r--r-- | 3.3 KB |
Makefile.modsign | -rw-r--r-- | 791 bytes |
Makefile.package | -rw-r--r-- | 6.6 KB |
Makefile.ubsan | -rw-r--r-- | 1.0 KB |
adjust_autoksyms.sh | -rwxr-xr-x | 2.2 KB |
asn1_compiler.c | -rw-r--r-- | 35.3 KB |
bin2c.c | -rw-r--r-- | 743 bytes |
bloat-o-meter | -rwxr-xr-x | 3.3 KB |
bootgraph.pl | -rwxr-xr-x | 5.6 KB |
bpf_helpers_doc.py | -rwxr-xr-x | 20.1 KB |
cc-can-link.sh | -rwxr-xr-x | 166 bytes |
check-sysctl-docs | -rwxr-xr-x | 4.4 KB |
check_extable.sh | -rwxr-xr-x | 4.9 KB |
checkincludes.pl | -rwxr-xr-x | 1.9 KB |
checkkconfigsymbols.py | -rwxr-xr-x | 15.5 KB |
checkpatch.pl | -rwxr-xr-x | 202.5 KB |
checkstack.pl | -rwxr-xr-x | 5.3 KB |
checksyscalls.sh | -rwxr-xr-x | 7.3 KB |
checkversion.pl | -rwxr-xr-x | 1.9 KB |
clang-version.sh | -rwxr-xr-x | 527 bytes |
cleanfile | -rwxr-xr-x | 3.5 KB |
cleanpatch | -rwxr-xr-x | 5.1 KB |
coccicheck | -rwxr-xr-x | 7.2 KB |
config | -rwxr-xr-x | 4.6 KB |
const_structs.checkpatch | -rw-r--r-- | 964 bytes |
decode_stacktrace.sh | -rwxr-xr-x | 3.9 KB |
decodecode | -rwxr-xr-x | 2.6 KB |
depmod.sh | -rwxr-xr-x | 1.3 KB |
diffconfig | -rwxr-xr-x | 3.7 KB |
documentation-file-ref-check | -rwxr-xr-x | 5.6 KB |
export_report.pl | -rwxr-xr-x | 4.5 KB |
extract-cert.c | -rw-r--r-- | 3.5 KB |
extract-ikconfig | -rwxr-xr-x | 1.7 KB |
extract-module-sig.pl | -rwxr-xr-x | 3.7 KB |
extract-sys-certs.pl | -rwxr-xr-x | 3.7 KB |
extract-vmlinux | -rwxr-xr-x | 1.7 KB |
extract_xc3028.pl | -rwxr-xr-x | 44.6 KB |
faddr2line | -rwxr-xr-x | 6.2 KB |
file-size.sh | -rwxr-xr-x | 86 bytes |
find-unused-docs.sh | -rwxr-xr-x | 1.3 KB |
gcc-goto.sh | -rwxr-xr-x | 511 bytes |
gcc-ld | -rwxr-xr-x | 711 bytes |
gcc-plugin.sh | -rwxr-xr-x | 406 bytes |
gcc-version.sh | -rwxr-xr-x | 588 bytes |
gcc-x86_32-has-stack-protector.sh | -rwxr-xr-x | 173 bytes |
gcc-x86_64-has-stack-protector.sh | -rwxr-xr-x | 198 bytes |
gen_autoksyms.sh | -rwxr-xr-x | 1.3 KB |
gen_compile_commands.py | -rwxr-xr-x | 5.6 KB |
gen_ksymdeps.sh | -rwxr-xr-x | 399 bytes |
get_abi.pl | -rwxr-xr-x | 10.1 KB |
get_dvb_firmware | -rwxr-xr-x | 24.5 KB |
get_maintainer.pl | -rwxr-xr-x | 66.6 KB |
gfp-translate | -rwxr-xr-x | 1.7 KB |
headerdep.pl | -rwxr-xr-x | 3.5 KB |
headers_check.pl | -rwxr-xr-x | 3.7 KB |
headers_install.sh | -rwxr-xr-x | 3.6 KB |
insert-sys-cert.c | -rw-r--r-- | 8.9 KB |
jobserver-exec | -rwxr-xr-x | 2.2 KB |
kallsyms.c | -rw-r--r-- | 17.4 KB |
kernel-doc | -rwxr-xr-x | 61.4 KB |
ld-version.sh | -rwxr-xr-x | 269 bytes |
leaking_addresses.pl | -rwxr-xr-x | 12.8 KB |
link-vmlinux.sh | -rwxr-xr-x | 8.4 KB |
makelst | -rwxr-xr-x | 808 bytes |
markup_oops.pl | -rwxr-xr-x | 7.9 KB |
mkcompile_h | -rwxr-xr-x | 2.3 KB |
mkmakefile | -rwxr-xr-x | 426 bytes |
mksysmap | -rwxr-xr-x | 1.3 KB |
mkuboot.sh | -rwxr-xr-x | 414 bytes |
module-common.lds | -rw-r--r-- | 901 bytes |
modules-check.sh | -rwxr-xr-x | 303 bytes |
namespace.pl | -rwxr-xr-x | 13.2 KB |
nsdeps | -rw-r--r-- | 1.9 KB |
objdiff | -rwxr-xr-x | 2.8 KB |
parse-maintainers.pl | -rwxr-xr-x | 4.5 KB |
patch-kernel | -rwxr-xr-x | 9.9 KB |
profile2linkerlist.pl | -rwxr-xr-x | 414 bytes |
prune-kernel | -rwxr-xr-x | 708 bytes |
recordmcount.c | -rw-r--r-- | 16.5 KB |
recordmcount.h | -rw-r--r-- | 17.1 KB |
recordmcount.pl | -rwxr-xr-x | 18.8 KB |
setlocalversion | -rwxr-xr-x | 4.3 KB |
show_delta | -rwxr-xr-x | 3.0 KB |
sign-file.c | -rw-r--r-- | 9.8 KB |
sorttable.c | -rw-r--r-- | 7.5 KB |
sorttable.h | -rw-r--r-- | 9.7 KB |
spdxcheck-test.sh | -rw-r--r-- | 323 bytes |
spdxcheck.py | -rwxr-xr-x | 9.9 KB |
spelling.txt | -rw-r--r-- | 29.9 KB |
sphinx-pre-install | -rwxr-xr-x | 18.3 KB |
split-man.pl | -rwxr-xr-x | 600 bytes |
stackdelta | -rwxr-xr-x | 1.8 KB |
stackusage | -rwxr-xr-x | 794 bytes |
subarch.include | -rw-r--r-- | 641 bytes |
tags.sh | -rwxr-xr-x | 9.3 KB |
tools-support-relr.sh | -rwxr-xr-x | 518 bytes |
unifdef.c | -rw-r--r-- | 34.8 KB |
ver_linux | -rwxr-xr-x | 2.7 KB |
xen-hypercalls.sh | -rw-r--r-- | 386 bytes |
xz_wrap.sh | -rwxr-xr-x | 562 bytes |
![swh spinner](/static/img/swh-spinner.gif)
Computing file changes ...