From: Easwar Hariharan <eahariha@xxxxxxxxxxxxxxxxxxx> Sent: Tuesday, January 7, 2025 9:29 AM > > If there's a persistent error in the hypervisor, the scsi warning for > failed IO can flood the kernel log and max out CPU utilization, > preventing troubleshooting from the VM side. Ratelimit the warning so > it doesn't DOS the VM. > > Closes: > https://github.com/microsoft/WSL/issues/9173 > Signed-off-by: Easwar Hariharan <eahariha@xxxxxxxxxxxxxxxxxxx> > --- > If there's a persistent error in the hypervisor, the scsi warning for > failed IO can overwhelm the kernel log and max out CPU utilization, > preventing troubleshooting. Ratelimit the warning so it doesn't DOS the > VM. > > This is not super critical and can be deferred to an 6.14 rc since it > mostly occurs when there's a problem with the host disk or filesystem. > --- > drivers/scsi/storvsc_drv.c | 8 +++++++- > 1 file changed, 7 insertions(+), 1 deletion(-) > > diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c > index > 45665d4aca925a10ce4293edf40cebdc4d4997f2..5a101ac06c478aad9b01072e7a6c > 5af48219f5c8 100644 > --- a/drivers/scsi/storvsc_drv.c > +++ b/drivers/scsi/storvsc_drv.c > @@ -171,6 +171,12 @@ do { > \ > dev_warn(&(dev)->device, fmt, ##__VA_ARGS__); \ > } while (0) > > +#define storvsc_log_ratelimited(dev, level, fmt, ...) \ > +do { \ > + if (do_logging(level)) \ > + dev_warn_ratelimited(&(dev)->device, fmt, ##__VA_ARGS__); \ > +} while (0) > + > struct vmscsi_request { > u16 length; > u8 srb_status; > @@ -1176,7 +1182,7 @@ static void storvsc_on_io_completion(struct storvsc_device *stor_device, > int loglevel = (stor_pkt->vm_srb.cdb[0] == TEST_UNIT_READY) ? > STORVSC_LOGGING_WARN : STORVSC_LOGGING_ERROR; > > - storvsc_log(device, loglevel, > + storvsc_log_ratelimited(device, loglevel, > "tag#%d cmd 0x%x status: scsi 0x%x srb 0x%x hv 0x%x\n", > scsi_cmd_to_rq(request->cmd)->tag, > stor_pkt->vm_srb.cdb[0], > > --- > base-commit: 4e16367cfe0ce395f29d0482b78970cce8e1db73 > change-id: 20241023-eahariha-ratelimit-storvsc-b3fe53f02a58 > > Best regards, > -- > Easwar Hariharan <eahariha@xxxxxxxxxxxxxxxxxxx> > Reviewed-by: Michael Kelley <mhklinux@xxxxxxxxxxx>
