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| author | Christian Krinitsin <mail@krinitsin.com> | 2025-05-30 16:52:07 +0200 |
|---|---|---|
| committer | Christian Krinitsin <mail@krinitsin.com> | 2025-05-30 16:52:17 +0200 |
| commit | 9260319e7411ff8281700a532caa436f40120ec4 (patch) | |
| tree | 2f6bfe5f3458dd49d328d3a9eb508595450adec0 /gitlab/issues/target_sparc/host_missing/accel_missing/2143.toml | |
| parent | 225caa38269323af1bfc2daadff5ec8bd930747f (diff) | |
| download | emulator-bug-study-9260319e7411ff8281700a532caa436f40120ec4.tar.gz emulator-bug-study-9260319e7411ff8281700a532caa436f40120ec4.zip | |
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Diffstat (limited to 'gitlab/issues/target_sparc/host_missing/accel_missing/2143.toml')
| -rw-r--r-- | gitlab/issues/target_sparc/host_missing/accel_missing/2143.toml | 46 |
1 files changed, 0 insertions, 46 deletions
diff --git a/gitlab/issues/target_sparc/host_missing/accel_missing/2143.toml b/gitlab/issues/target_sparc/host_missing/accel_missing/2143.toml deleted file mode 100644 index 9338ee70..00000000 --- a/gitlab/issues/target_sparc/host_missing/accel_missing/2143.toml +++ /dev/null @@ -1,46 +0,0 @@ -id = 2143 -title = "ladr_match can cause bus error due to unaligned fetch" -state = "closed" -created_at = "2024-02-01T03:51:06.350Z" -closed_at = "2024-03-12T16:28:31.326Z" -labels = ["kind::Bug", "target: sparc", "workflow::Patch available"] -url = "https://gitlab.com/qemu-project/qemu/-/issues/2143" -host-os = "Solaris 11" -host-arch = "SPARC" -qemu-version = "8.2.50 (v8.2.0-887-g11be70677c-dirty)" -guest-os = "SunOS" -guest-arch = "SPARC" -description = """On a SPARC host system, which does not support unaligned fetches, QEMU sometimes takes a bus error in ladr_match.""" -reproduce = """1. (see QEMU command line above) -2. let the system boot -3.""" -additional = """Problem is a hack in ladr_match - hw/net/pcnet.c:635 (present since 2006!): - -``` -Core was generated by `./qemu-system-sparc -rtc base=utc,clock=host -vga cg3 -g 1024x768x8 -machine SS'. -Program terminated with signal SIGKILL, Killed. -#0 0xffffffff7ec3b178 in ladr_match (size=110, buf=0xffffffff7ffee972 "33", s=0x808f2a20) at ../hw/net/pcnet.c:634 -634 if ((*(hdr->ether_dhost)&0x01) && -[Current thread is 632 (LWP 1 )] -(gdb) list -629 } -630 -631 static inline int ladr_match(PCNetState *s, const uint8_t *buf, int size) -632 { -633 struct qemu_ether_header *hdr = (void *)buf; -634 if ((*(hdr->ether_dhost)&0x01) && -635 ((uint64_t *)&s->csr[8])[0] != 0LL) { -636 uint8_t ladr[8] = { -637 s->csr[8] & 0xff, s->csr[8] >> 8, -638 s->csr[9] & 0xff, s->csr[9] >> 8, -(gdb) print &s->csr[8] -$1 = (uint16_t *) 0x808f4a7c -``` -The address of s->csr[8], in this case, is on a 4-byte boundary not an 8-byte boundary, so the hack to test for 8 bytes (4 x 16-bit words) being 0 by casting the address up to a pointer to uint64_t and dereferencing it fails. - -The data does not seem to be allocated with a deterministic alignment, this failure does not always occur. - -A solution to avoid alignment errors could be to test -``` - (s->csr[8] | s->csr[9] | s->csr[10] | s->csr[11]) != 0 -```""" |