New proposal: https://lists.gnu.org/archive/html/qemu- devel/2020-07/msg06974.html
(The root cause is that SRST is not handled correctly.) More analysis in the replies to Philippe's patch: https://lists.gnu.org/archive/html/qemu-devel/2020-07/msg05949.html ** Changed in: qemu Assignee: (unassigned) => John Snow (jnsnow) ** Changed in: qemu Status: Confirmed => In Progress -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1887309 Title: Floating-point exception in ide_set_sector Status in QEMU: In Progress Bug description: Hello, Here is a reproducer: cat << EOF | ./i386-softmmu/qemu-system-i386 -M pc,accel=qtest\ -qtest null -nographic -vga qxl -qtest stdio -nodefaults\ -drive if=none,id=drive0,file=null-co://,file.read-zeroes=on,format=raw\ -drive if=none,id=drive1,file=null-co://,file.read-zeroes=on,format=raw\ -device ide-cd,drive=drive0 -device ide-hd,drive=drive1 outw 0x176 0x3538 outl 0xcf8 0x80000903 outl 0xcfc 0x184275c outb 0x376 0x2f outb 0x376 0x0 outw 0x176 0xa1a4 outl 0xcf8 0x80000920 outb 0xcfc 0xff outb 0xf8 0x9 EOF The stack-trace: ==16513==ERROR: UndefinedBehaviorSanitizer: FPE on unknown address 0x556783603fdc (pc 0x556783603fdc bp 0x7fff82143b10 sp 0x7fff82143ab0 T16513) #0 0x556783603fdc in ide_set_sector /home/alxndr/Development/qemu/hw/ide/core.c:626:26 #1 0x556783603fdc in ide_dma_cb /home/alxndr/Development/qemu/hw/ide/core.c:883:9 #2 0x55678349d74d in dma_complete /home/alxndr/Development/qemu/dma-helpers.c:120:9 #3 0x55678349d74d in dma_blk_cb /home/alxndr/Development/qemu/dma-helpers.c:138:9 #4 0x556783962f25 in blk_aio_complete /home/alxndr/Development/qemu/block/block-backend.c:1402:9 #5 0x556783962f25 in blk_aio_complete_bh /home/alxndr/Development/qemu/block/block-backend.c:1412:5 #6 0x556783ac030f in aio_bh_call /home/alxndr/Development/qemu/util/async.c:136:5 #7 0x556783ac030f in aio_bh_poll /home/alxndr/Development/qemu/util/async.c:164:13 #8 0x556783a9a863 in aio_dispatch /home/alxndr/Development/qemu/util/aio-posix.c:380:5 #9 0x556783ac1b4c in aio_ctx_dispatch /home/alxndr/Development/qemu/util/async.c:306:5 #10 0x7f4f1c0fe9ed in g_main_context_dispatch (/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x4e9ed) #11 0x556783acdccb in glib_pollfds_poll /home/alxndr/Development/qemu/util/main-loop.c:219:9 #12 0x556783acdccb in os_host_main_loop_wait /home/alxndr/Development/qemu/util/main-loop.c:242:5 #13 0x556783acdccb in main_loop_wait /home/alxndr/Development/qemu/util/main-loop.c:518:11 #14 0x5567833613e5 in qemu_main_loop /home/alxndr/Development/qemu/softmmu/vl.c:1664:9 #15 0x556783a07a4d in main /home/alxndr/Development/qemu/softmmu/main.c:49:5 #16 0x7f4f1ac84e0a in __libc_start_main /build/glibc-GwnBeO/glibc-2.30/csu/../csu/libc-start.c:308:16 #17 0x5567830a9089 in _start (/home/alxndr/Development/qemu/build/i386-softmmu/qemu-system-i386+0x7d2089) With -trace ide* 12163@1594585516.671265:ide_reset IDEstate 0x56162a269058 [R +0.024963] outw 0x176 0x3538 12163@1594585516.673676:ide_ioport_write IDE PIO wr @ 0x176 (Device/Head); val 0x38; bus 0x56162a268c00 IDEState 0x56162a268c88 12163@1594585516.673683:ide_ioport_write IDE PIO wr @ 0x177 (Command); val 0x35; bus 0x56162a268c00 IDEState 0x56162a269058 12163@1594585516.673686:ide_exec_cmd IDE exec cmd: bus 0x56162a268c00; state 0x56162a269058; cmd 0x35 OK [S +0.025002] OK [R +0.025012] outl 0xcf8 0x80000903 OK [S +0.025018] OK [R +0.025026] outl 0xcfc 0x184275c OK [S +0.025210] OK [R +0.025219] outb 0x376 0x2f 12163@1594585516.673916:ide_cmd_write IDE PIO wr @ 0x376 (Device Control); val 0x2f; bus 0x56162a268c00 OK [S +0.025229] OK [R +0.025234] outb 0x376 0x0 12163@1594585516.673928:ide_cmd_write IDE PIO wr @ 0x376 (Device Control); val 0x00; bus 0x56162a268c00 OK [S +0.025240] OK [R +0.025246] outw 0x176 0xa1a4 12163@1594585516.673940:ide_ioport_write IDE PIO wr @ 0x176 (Device/Head); val 0xa4; bus 0x56162a268c00 IDEState 0x56162a269058 12163@1594585516.673943:ide_ioport_write IDE PIO wr @ 0x177 (Command); val 0xa1; bus 0x56162a268c00 IDEState 0x56162a268c88 12163@1594585516.673946:ide_exec_cmd IDE exec cmd: bus 0x56162a268c00; state 0x56162a268c88; cmd 0xa1 OK [S +0.025265] OK [R +0.025270] outl 0xcf8 0x80000920 OK [S +0.025274] OK [R +0.025279] outb 0xcfc 0xff OK [S +0.025443] OK [R +0.025451] outb 0xf8 0x9 12163@1594585516.674221:ide_dma_cb IDEState 0x56162a268c88; sector_num=0 n=1 cmd=DMA READ OK [S +0.025724] OK UndefinedBehaviorSanitizer:DEADLYSIGNAL ==12163==ERROR: UndefinedBehaviorSanitizer: FPE on unknown address 0x5616279cffdc (pc 0x5616279cffdc bp 0x7ffcdaabae90 sp 0x7ffcdaabae30 T12163) -Alex To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1887309/+subscriptions
