From cbfdd7dd99ff6511f086f057cec6dbd7e0051634 Mon Sep 17 00:00:00 2001 From: avg Date: Wed, 21 Feb 2018 14:31:48 +0000 Subject: [PATCH] MFV r329713: 8731 ASSERT3U(nui64s, <=, UINT16_MAX) fails for large blocks illumos/illumos-gate@a6c1eb3c08094a6db69aa1dc6315bc814e82e79c https://github.com/illumos/illumos-gate/commit/a6c1eb3c08094a6db69aa1dc6315bc814e82e79c https://www.illumos.org/issues/8731 annotate_ecksum() asserts that nui64s, calculated as nui64s = size / sizeof (uint64_t), is not greater than UINT16_MAX. This restriction is needed because histograms of incorrectly set and cleared bits have 16 bit counters and if the buffer consists of too many 64-bit words, then a counter can potentially overflow producing an incorrect result. When the largest buffer size was 128KB the greatest value of nui64s was 16K, well within the limit. But now we have support for large buffers and for buffer sizes of 512KB and above the restriction is violated. Reviewed by: Matthew Ahrens Approved by: Dan McDonald Author: Andriy Gapon MFC after: 2 weeks --- .../contrib/opensolaris/uts/common/fs/zfs/zfs_fm.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_fm.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_fm.c index fa5903a432dd..398a3d04aa6e 100644 --- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_fm.c +++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_fm.c @@ -360,8 +360,8 @@ zfs_ereport_start(nvlist_t **ereport_out, nvlist_t **detector_out, typedef struct zfs_ecksum_info { /* histograms of set and cleared bits by bit number in a 64-bit word */ - uint16_t zei_histogram_set[sizeof (uint64_t) * NBBY]; - uint16_t zei_histogram_cleared[sizeof (uint64_t) * NBBY]; + uint32_t zei_histogram_set[sizeof (uint64_t) * NBBY]; + uint32_t zei_histogram_cleared[sizeof (uint64_t) * NBBY]; /* inline arrays of bits set and cleared. */ uint64_t zei_bits_set[ZFM_MAX_INLINE]; @@ -386,7 +386,7 @@ typedef struct zfs_ecksum_info { } zfs_ecksum_info_t; static void -update_histogram(uint64_t value_arg, uint16_t *hist, uint32_t *count) +update_histogram(uint64_t value_arg, uint32_t *hist, uint32_t *count) { size_t i; size_t bits = 0; @@ -552,7 +552,7 @@ annotate_ecksum(nvlist_t *ereport, zio_bad_cksum_t *info, if (badbuf == NULL || goodbuf == NULL) return (eip); - ASSERT3U(nui64s, <=, UINT16_MAX); + ASSERT3U(nui64s, <=, UINT32_MAX); ASSERT3U(size, ==, nui64s * sizeof (uint64_t)); ASSERT3U(size, <=, SPA_MAXBLOCKSIZE); ASSERT3U(size, <=, UINT32_MAX); @@ -654,10 +654,10 @@ annotate_ecksum(nvlist_t *ereport, zio_bad_cksum_t *info, } else { fm_payload_set(ereport, FM_EREPORT_PAYLOAD_ZFS_BAD_SET_HISTOGRAM, - DATA_TYPE_UINT16_ARRAY, + DATA_TYPE_UINT32_ARRAY, NBBY * sizeof (uint64_t), eip->zei_histogram_set, FM_EREPORT_PAYLOAD_ZFS_BAD_CLEARED_HISTOGRAM, - DATA_TYPE_UINT16_ARRAY, + DATA_TYPE_UINT32_ARRAY, NBBY * sizeof (uint64_t), eip->zei_histogram_cleared, NULL); }