linux

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objtool: Add more robust signal error handling, detect and warn about stack overflows When the kernel build fails due to an objtool segfault, the error message is a bit obtuse and confusing: make[5]: * [scripts/Makefile.build:503: drivers/scsi/qla2xxx/qla2xxx.o] Error 139 ^^^^^^^^^ make[5]: * Deleting file 'drivers/scsi/qla2xxx/qla2xxx.o' make[4]: * [scripts/Makefile.build:556: drivers/scsi/qla2xxx] Error 2 make[3]: * [scripts/Makefile.build:556: drivers/scsi] Error 2 make[2]: * [scripts/Makefile.build:556: drivers] Error 2 make[1]: * [/home/jpoimboe/git/linux/Makefile:2013: .] Error 2 make: *** [Makefile:248: __sub-make] Error 2 Add a signal handler to objtool which prints an error message like if the local stack has overflown (for which there's a chance as objtool makes heavy use of recursion): drivers/scsi/qla2xxx/qla2xxx.o: error: SIGSEGV: objtool stack overflow! or: drivers/scsi/qla2xxx/qla2xxx.o: error: SIGSEGV: objtool crash! Also, re-raise the signal so the core dump still gets triggered. [ mingo: Applied a build fix, added more comments and prettified the code. ] Suggested-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Alexandre Chartre <alexandre.chartre@oracle.com> Cc: David Laight <david.laight.linux@gmail.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Nathan Chancellor <nathan@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: https://patch.msgid.link/mi4tihk4dbncn7belrhp6ooudhpw4vdggerktu5333w3gqf3uf@vqlhc3y667mg 2025-12-02 15:01:17 -08:00

135 lines 2.8 KiB Raw Permalink Normal View History

135 lines

2.8 KiB

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