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Hi! I observed this for 3.0.101-97 kernel (SLES11 SP4, x86_64): When a mmap()ed file has a write error (e.g. bad sector), the program is terminated with SIGBUS. Trying to handle the situation, I noticed that the error code in siginfo is 2 (BUS_ADRERR, nonexistent physical address). My expectation was that the error would be 3 (BUS_OBJERR, object-specific hardware error). For debugging I created this dummy device with a bad block: DEV=bad_disk dmsetup create "$DEV" <<EOF 0 8 zero 8 1 error 9 255 zero EOF The kernel error logged is " kernel: [2932614.419355] Buffer I/O error on device dm-8, logical block 1" Is my expectation on the si_code wrong, or is the implementation wrong? At a quick glance at do_sigbus() of /usr/src/linux/arch/x86/mm/fault.c I see that only codes BUS_ADRERR (default) and BUS_MCEERR_AR are used. However I don't know whether I looked at the correct source. (The code in 4.4.62 still looks similar) Regards, Ulrich Windl P.S: Keep me on CC: in your replies, please! |
