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| -rw-r--r-- | tools/guest-diag/nmi_catch.sh | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/tools/guest-diag/nmi_catch.sh b/tools/guest-diag/nmi_catch.sh new file mode 100644 index 0000000..3afa895 --- /dev/null +++ b/tools/guest-diag/nmi_catch.sh @@ -0,0 +1,26 @@ +#!/bin/sh +# nmi_catch.sh [rounds] [sleep] - trigger sysrq-l NMI backtraces and append a +# compact summary of the nvidia frames seen in each round (guest side, root). +# +# The guest RM's expiring waits are kernel busy-polls (their internals are +# `notrace`, so ftrace/kprobes cannot see them). sysrq-l prints each CPU's +# current kernel stack, and this script keeps only the lines that carry an +# `[nvidia]` frame plus the owning `Comm:` line, so the wait/teardown stack +# survives even when the dmesg ring wraps. +# +# Run: sudo sh nmi_catch.sh 42 6 & (42 rounds every 6 s) +# Read: /tmp/nmi2.log (sorted unique Comm/nvidia-frame lines) +rm -f /tmp/nmi2.raw +i=0 +R=${1:-40} +S=${2:-6} +echo 1 > /proc/sys/kernel/sysrq +while [ $i -lt "$R" ]; do + echo l > /proc/sysrq-trigger + sleep "$S" + dmesg | grep -aB20 '\[nvidia\]' | grep -aE 'Comm: |\[nvidia\]' >> /tmp/nmi2.raw 2>/dev/null + i=$((i+1)) +done +sort -u /tmp/nmi2.raw > /tmp/nmi2.log 2>/dev/null +echo DONE >> /tmp/nmi2.log +wc -l /tmp/nmi2.log
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