05de45383b
The macro that creates both the structure and the format displayed to user space for the stack trace event was changed a while ago to fix the parsing by user space tooling. But this change also modified the structure used to store the stack trace event. It changed the caller array field from [0] to [8]. Even though the size in the ring buffer is dynamic and can be something other than 8 (user space knows how to handle this), the 8 extra words was not accounted for when reserving the event on the ring buffer, and added 8 more entries, due to the calculation of "sizeof(*entry) + nr_entries * sizeof(long)", as the sizeof(*entry) now contains 8 entries. The size of the caller field needs to be subtracted from the size of the entry to create the correct allocation size. -----BEGIN PGP SIGNATURE----- iIoEABYIADIWIQRRSw7ePDh/lE+zeZMp5XQQmuv6qgUCYGccURQccm9zdGVkdEBn b29kbWlzLm9yZwAKCRAp5XQQmuv6qiboAPwNM1q8A7EFLDGfj+3tXksvp4H3hXd3 ErMd2OMlsNQtRAD9GGmYyt2OtFdxZWzKOSEC07vdxq2TYTz50mqJM81YbgE= =7hwx -----END PGP SIGNATURE----- Merge tag 'trace-v5.12-rc5-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace Pull tracing fix from Steven Rostedt: "Fix stack trace entry size to stop showing garbage The macro that creates both the structure and the format displayed to user space for the stack trace event was changed a while ago to fix the parsing by user space tooling. But this change also modified the structure used to store the stack trace event. It changed the caller array field from [0] to [8]. Even though the size in the ring buffer is dynamic and can be something other than 8 (user space knows how to handle this), the 8 extra words was not accounted for when reserving the event on the ring buffer, and added 8 more entries, due to the calculation of "sizeof(*entry) + nr_entries * sizeof(long)", as the sizeof(*entry) now contains 8 entries. The size of the caller field needs to be subtracted from the size of the entry to create the correct allocation size" * tag 'trace-v5.12-rc5-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: tracing: Fix stack trace event size |
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| bpf | ||
| cgroup | ||
| configs | ||
| debug | ||
| dma | ||
| entry | ||
| events | ||
| gcov | ||
| irq | ||
| kcsan | ||
| livepatch | ||
| locking | ||
| power | ||
| printk | ||
| rcu | ||
| sched | ||
| time | ||
| trace | ||
| .gitignore | ||
| Kconfig.freezer | ||
| Kconfig.hz | ||
| Kconfig.locks | ||
| Kconfig.preempt | ||
| Makefile | ||
| acct.c | ||
| async.c | ||
| audit.c | ||
| audit.h | ||
| audit_fsnotify.c | ||
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| auditsc.c | ||
| backtracetest.c | ||
| bounds.c | ||
| capability.c | ||
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| cpu.c | ||
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| crash_dump.c | ||
| cred.c | ||
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| gen_kheaders.sh | ||
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| irq_work.c | ||
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| profile.c | ||
| ptrace.c | ||
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| reboot.c | ||
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| signal.c | ||
| smp.c | ||
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| softirq.c | ||
| stackleak.c | ||
| stacktrace.c | ||
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| sys.c | ||
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| task_work.c | ||
| taskstats.c | ||
| test_kprobes.c | ||
| torture.c | ||
| tracepoint.c | ||
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| uid16.h | ||
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| user.c | ||
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