[DTrace-devel] [PATCH v2] dtrace: BPF program load for '...' failed: No space left on device
Kris Van Hees
kris.van.hees at oracle.com
Wed Jan 13 12:21:29 PST 2021
Thank you for the changes. Nice job.
Is the bpflogsize option also supposed to work when set using a pragma?
If so, a test for that should exist as well because right now you are only
testing setting the option from the cmdline.
On Mon, Jan 11, 2021 at 04:59:48PM -0500, eugene.loh at oracle.com wrote:
> From: Eugene Loh <eugene.loh at oracle.com>
>
> A D script that produces BPF code with many code paths can result
> in 16 Mbytes of BPF log file, ending with the above error message.
> The log file really says nothing about why the BPF load failed.
> The actual problem is that we supplied a 16-Mbyte log buffer that
> is too small.
>
> If no log buffer is supplied, this problem is not encountered.
>
> Change DTrace's BPF program load to use no log buffer at first.
> If the load fails, then retry with a log buffer. The load should
> again fail, but if the failure is not ENOSPC, we can simply report
> the log and be done. If the failure becomes ENOSPC, inform the
> user of the problem and what action can be taken to increase the
> buffer size.
>
> Provide a new DTrace option to control the log buffer size.
>
> Add tests for this fix. Specifically, the aggregation function
> quantize() can be used, since it must quantize a value into one
> of 127 different bins. The algorithm used has many code paths
> and thereby exercises the BPF verifier well.
>
> https://github.com/oracle/dtrace-utils/issues/6
> Signed-off-by: Eugene Loh <eugene.loh at oracle.com>
> ---
> include/dtrace/options_defines.h | 3 +-
> libdtrace/dt_bpf.c | 42 +++++++----
> libdtrace/dt_options.c | 1 +
> test/unittest/misc/err.BPFlog.d | 114 ++++++++++++++++++++++++++++++
> test/unittest/misc/err.BPFlog.r | 5 ++
> test/unittest/misc/tst.BPFlog.d | 39 ++++++++++
> test/unittest/misc/tst.BPFlog.r | 7 ++
> test/unittest/misc/tst.BPFlog2.sh | 104 +++++++++++++++++++++++++++
> 8 files changed, 300 insertions(+), 15 deletions(-)
> create mode 100644 test/unittest/misc/err.BPFlog.d
> create mode 100644 test/unittest/misc/err.BPFlog.r
> create mode 100644 test/unittest/misc/tst.BPFlog.d
> create mode 100644 test/unittest/misc/tst.BPFlog.r
> create mode 100755 test/unittest/misc/tst.BPFlog2.sh
>
> diff --git a/include/dtrace/options_defines.h b/include/dtrace/options_defines.h
> index ed4a7c15..ed7ea451 100644
> --- a/include/dtrace/options_defines.h
> +++ b/include/dtrace/options_defines.h
> @@ -57,7 +57,8 @@
> #define DTRACEOPT_QUIETRESIZE 27 /* quieten buffer-resize messages */
> #define DTRACEOPT_NORESOLVE 28 /* prevent resolution of symbols */
> #define DTRACEOPT_PCAPSIZE 29 /* number of bytes to be captured */
> -#define DTRACEOPT_MAX 30 /* number of options */
> +#define DTRACEOPT_BPFLOGSIZE 30 /* BPF verifier log, max # bytes */
> +#define DTRACEOPT_MAX 31 /* number of options */
>
> #define DTRACEOPT_UNSET (dtrace_optval_t)-2 /* unset option */
>
> diff --git a/libdtrace/dt_bpf.c b/libdtrace/dt_bpf.c
> index c6102f15..158b441b 100644
> --- a/libdtrace/dt_bpf.c
> +++ b/libdtrace/dt_bpf.c
> @@ -323,9 +323,11 @@ dt_bpf_load_prog(dtrace_hdl_t *dtp, const dt_probe_t *prp,
> const dtrace_difo_t *dp)
> {
> struct bpf_load_program_attr attr;
> - int logsz = BPF_LOG_BUF_SIZE;
> + size_t logsz;
> char *log;
> int rc;
> + const dtrace_probedesc_t *pdp = prp->desc;
> + char *p, *q;
>
> /*
> * Check whether there are any probe-specific relocations to be
> @@ -340,27 +342,39 @@ dt_bpf_load_prog(dtrace_hdl_t *dtp, const dt_probe_t *prp,
>
> memset(&attr, 0, sizeof(struct bpf_load_program_attr));
>
> - log = dt_zalloc(dtp, logsz);
> - assert(log != NULL);
> -
> attr.prog_type = prp->prov->impl->prog_type;
> attr.name = NULL;
> attr.insns = dp->dtdo_buf;
> attr.insns_cnt = dp->dtdo_len;
> attr.license = BPF_CG_LICENSE;
> - attr.log_level = 4 | 2 | 1;
>
> + rc = bpf_load_program_xattr(&attr, NULL, 0);
> + if (rc >= 0)
> + return rc;
> +
> + /* if failure, note error and rerun with logging */
> + dt_bpf_error(dtp, "BPF program load for '%s:%s:%s:%s' failed: %s\n",
> + pdp->prv, pdp->mod, pdp->fun, pdp->prb,
> + strerror(errno));
> + if (dtp->dt_options[DTRACEOPT_BPFLOGSIZE] != DTRACEOPT_UNSET)
> + logsz = dtp->dt_options[DTRACEOPT_BPFLOGSIZE];
> + else
> + logsz = BPF_LOG_BUF_SIZE;
> + attr.log_level = 4 | 2 | 1;
> + log = dt_zalloc(dtp, logsz);
> + assert(log != NULL);
> rc = bpf_load_program_xattr(&attr, log, logsz);
> - if (rc < 0) {
> - const dtrace_probedesc_t *pdp = prp->desc;
> - char *p, *q;
>
> - rc = dt_bpf_error(dtp,
> - "BPF program load for '%s:%s:%s:%s' failed: "
> - "%s\n",
> - pdp->prv, pdp->mod, pdp->fun, pdp->prb,
> - strerror(errno));
> + /* since it failed once, it should fail again */
> + assert(rc < 0);
>
> + /* check whether we have an incomplete BPF log */
> + if (errno == ENOSPC) {
> + fprintf(stderr,
> + "BPF verifier log is incomplete and is not reported.\n"
> + "Set DTrace option 'bpflogsize' to some greater size for more output.\n"
> + "(Current size is %ld.)\n", logsz);
> + } else {
> /*
> * If there is BPF verifier output, print it with a "BPF: "
> * prefix so it is easier to distinguish.
> @@ -377,7 +391,7 @@ dt_bpf_load_prog(dtrace_hdl_t *dtp, const dt_probe_t *prp,
>
> dt_free(dtp, log);
>
> - return rc;
> + return -1;
> }
>
> int
> diff --git a/libdtrace/dt_options.c b/libdtrace/dt_options.c
> index 53c9507a..18e4e157 100644
> --- a/libdtrace/dt_options.c
> +++ b/libdtrace/dt_options.c
> @@ -1093,6 +1093,7 @@ static const dt_option_t _dtrace_ctoptions[] = {
> */
> static const dt_option_t _dtrace_rtoptions[] = {
> { "aggsize", dt_opt_size, DTRACEOPT_AGGSIZE },
> + { "bpflogsize", dt_opt_size, DTRACEOPT_BPFLOGSIZE },
> { "bufsize", dt_opt_size, DTRACEOPT_BUFSIZE },
> { "bufpolicy", dt_opt_bufpolicy, DTRACEOPT_BUFPOLICY },
> { "bufresize", dt_opt_bufresize, DTRACEOPT_BUFRESIZE },
> diff --git a/test/unittest/misc/err.BPFlog.d b/test/unittest/misc/err.BPFlog.d
> new file mode 100644
> index 00000000..e63ec3c3
> --- /dev/null
> +++ b/test/unittest/misc/err.BPFlog.d
> @@ -0,0 +1,114 @@
> +/*
> + * Oracle Linux DTrace.
> + * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
> + * Licensed under the Universal Permissive License v 1.0 as shown at
> + * http://oss.oracle.com/licenses/upl.
> + */
> +
> +#pragma D option quiet
> +
> +BEGIN
> +{
> + x = 1;
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + exit(0);
> +}
> diff --git a/test/unittest/misc/err.BPFlog.r b/test/unittest/misc/err.BPFlog.r
> new file mode 100644
> index 00000000..03b8df45
> --- /dev/null
> +++ b/test/unittest/misc/err.BPFlog.r
> @@ -0,0 +1,5 @@
> +-- @@stderr --
> +BPF verifier log is incomplete and is not reported.
> +Set DTrace option 'bpflogsize' to some greater size for more output.
> +(Current size is 16777215.)
> +dtrace: could not enable tracing: BPF program load for 'dtrace:::BEGIN' failed: Argument list too long
> diff --git a/test/unittest/misc/tst.BPFlog.d b/test/unittest/misc/tst.BPFlog.d
> new file mode 100644
> index 00000000..09b42d65
> --- /dev/null
> +++ b/test/unittest/misc/tst.BPFlog.d
> @@ -0,0 +1,39 @@
> +/*
> + * Oracle Linux DTrace.
> + * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
> + * Licensed under the Universal Permissive License v 1.0 as shown at
> + * http://oss.oracle.com/licenses/upl.
> + */
> +
> +#pragma D option quiet
> +
> +BEGIN
> +{
> + x = 1;
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);
> + exit(0);
> +}
> diff --git a/test/unittest/misc/tst.BPFlog.r b/test/unittest/misc/tst.BPFlog.r
> new file mode 100644
> index 00000000..3b880015
> --- /dev/null
> +++ b/test/unittest/misc/tst.BPFlog.r
> @@ -0,0 +1,7 @@
> +
> +
> + value ------------- Distribution ------------- count
> + 0 | 0
> + 1 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 100
> + 2 | 0
> +
> diff --git a/test/unittest/misc/tst.BPFlog2.sh b/test/unittest/misc/tst.BPFlog2.sh
> new file mode 100755
> index 00000000..86c2e606
> --- /dev/null
> +++ b/test/unittest/misc/tst.BPFlog2.sh
> @@ -0,0 +1,104 @@
> +#!/bin/bash
> +#
> +# Oracle Linux DTrace.
> +# Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved.
> +# Licensed under the Universal Permissive License v 1.0 as shown at
> +# http://oss.oracle.com/licenses/upl.
> +#
> +# @@timeout: 120
> +
> +dtrace=$1
> +
> +DIRNAME="$tmpdir/misc-BPFlog2.$$.$RANDOM"
> +mkdir -p $DIRNAME
> +cd $DIRNAME
> +
> +# form a D script that will not run and will require a large BPF log file
> +
> +cat > D.d << EOF
> +#pragma D option quiet
> +BEGIN
> +{
> + x = 1;
> +EOF
> +
> +for x in `seq 100`; do
> + echo " @ = quantize(x); @ = quantize(x); @ = quantize(x); @ = quantize(x);" >> D.d
> +done
> +
> +cat >> D.d << EOF
> + exit(0);
> +}
> +EOF
> +
> +# form the expected output when the BPF log size is too small
> +# ("nn" represents the size that appears in the actual output)
> +
> +cat > D.out << EOF
> +BPF verifier log is incomplete and is not reported.
> +Set DTrace option 'bpflogsize' to some greater size for more output.
> +(Current size is nn.)
> +dtrace: could not enable tracing: BPF program load for 'dtrace:::BEGIN' failed: Argument list too long
> +EOF
> +
> +# try the script with increasing BPF log size (starting with default)
> +
> +cursiz=$((16 * 1024 * 1024 - 1))
> +option=""
> +while [ $cursiz -lt $((2 * 1024 * 1024 * 1024)) ]; do
> +
> + # dtrace should not pass
> + $dtrace $option -s D.d >& tmp.out
> + if [ $? -eq 0 ]; then
> + echo unexpected pass
> + cat D.d
> + cat tmp.out
> + exit 1
> + fi
> +
> + # usually, it will fail because the BPF log size is too small
> + if [ `sed s/$cursiz/nn/ tmp.out | diff - D.out | wc -l` -eq 0 ]; then
> + echo okay: $cursiz is too small
> +
> + # so bump the size up and try again
> + cursiz=$((2 * $cursiz + 1))
> + option="-xbpflogsize=$cursiz"
> + continue
> + fi
> +
> + # otherwise, it should fail with a huge dump
> + actsiz=`cat tmp.out | wc -c`
> + status=0
> + if [ $actsiz -lt $(($cursiz / 2)) ]; then
> + echo ERROR: BPF output should have fit in smaller buffer
> + status=1
> + fi
> + if [ $actsiz -gt $cursiz ]; then
> + echo ERROR: BPF output is larger than user-specified limit
> + status=1
> + fi
> + if [ `grep -cv '^BPF: ' tmp.out` -ne 1 ]; then
> + echo ERROR: expected only one non-\"BPF:\" output line
> + status=1
> + fi
> + if ! grep -q '^BPF: BPF program is too large. Processed .* insn' tmp.out; then
> + echo ERROR: BPF error message is missing
> + status=1
> + fi
> + if ! grep -q '^dtrace: could not enable tracing: BPF program load for .* failed: Argument list too long' tmp.out; then
> + echo ERROR: dtrace error message is missing
> + status=1
> + fi
> + if [ $status -ne 0 ]; then
> + head -10 tmp.out
> + echo "..."
> + tail -10 tmp.out
> + else
> + echo SUCCESS: test failed with expected error
> + fi
> + exit $status
> +done
> +
> +echo "ERROR: BPF log size, currently $cursiz, has gotten unexpectedly large"
> +exit 1
> +
> --
> 2.18.4
>
>
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