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| author | Elazar Leibovich <elazar.leibovich@oracle.com> | 2020-03-15 15:26:34 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-04-01 19:00:16 +0200 |
| commit | e7ebf057e6a1ca4f5599caea143daa2135175a87 (patch) | |
| tree | 126b762448a31eef0fe1c65dbb55ece19b42c031 /hw/scsi | |
| parent | 2833ad487cfff7dc33703e4731b75facde1c561e (diff) | |
hw/scsi/vmw_pvscsi: Remove assertion for kick after reset
When running Ubuntu 3.13.0-65-generic guest, QEMU sometimes crashes
during guest ACPI reset. It crashes on assert(s->rings_info_valid)
in pvscsi_process_io().
Analyzing the crash revealed that it happens when userspace issues
a sync during a reboot syscall.
Below are backtraces we gathered from the guests.
Guest backtrace when issuing PVSCSI_CMD_ADAPTER_RESET:
pci_device_shutdown
device_shutdown
init_pid_ns
init_pid_ns
kernel_power_off
SYSC_reboot
Guest backtrace when issuing PVSCSI_REG_OFFSET_KICK_RW_IO:
scsi_done
scsi_dispatch_cmd
blk_add_timer
scsi_request_fn
elv_rb_add
__blk_run_queue
queue_unplugged
blk_flush_plug_list
blk_finish_plug
ext4_writepages
set_next_entity
do_writepages
__filemap_fdatawrite_range
filemap_write_and_wait_range
ext4_sync_file
ext4_sync_file
do_fsync
sys_fsync
Since QEMU pvscsi should imitate VMware pvscsi device emulation,
we decided to imitate VMware's behavior in this case.
To check VMware behavior, we wrote a kernel module that issues
a reset to the pvscsi device and then issues a kick. We ran it on
VMware ESXi 6.5 and it seems that it simply ignores the kick.
Hence, we decided to ignore the kick as well.
Signed-off-by: Elazar Leibovich <elazar.leibovich@oracle.com>
Signed-off-by: Liran Alon <liran.alon@oracle.com>
Message-Id: <20200315132634.113632-1-liran.alon@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'hw/scsi')
| -rw-r--r-- | hw/scsi/vmw_pvscsi.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/hw/scsi/vmw_pvscsi.c b/hw/scsi/vmw_pvscsi.c index c91352cf46..ec5bf9ea34 100644 --- a/hw/scsi/vmw_pvscsi.c +++ b/hw/scsi/vmw_pvscsi.c @@ -719,7 +719,10 @@ pvscsi_process_io(PVSCSIState *s) PVSCSIRingReqDesc descr; hwaddr next_descr_pa; - assert(s->rings_info_valid); + if (!s->rings_info_valid) { + return; + } + while ((next_descr_pa = pvscsi_ring_pop_req_descr(&s->rings)) != 0) { /* Only read after production index verification */ |