https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195349
--- Comment #9 from pascal.guitier...@gmail.com ---
Dec 1 17:44:06 nas01 kernel: ahcich3: Timeout on slot 6 port 0
Dec 1 17:44:06 nas01 kernel: ahcich3: is 00000008 cs 00000000 ss 00000000 rs
00000040 tfd 50 serr 00000000 cmd 00006617
Dec 1 17:44:06 nas01 kernel: (ada3:ahcich3:0:0:0): WRITE_FPDMA_QUEUED. ACB: 61
00 80 9e 2f 40 3e 00 00 01 00 00
Dec 1 17:44:06 nas01 kernel: (ada3:ahcich3:0:0:0): CAM status: Command timeout
Dec 1 17:44:06 nas01 kernel: ahcich2: (ada3:Timeout on slot 15 port 0
Dec 1 17:44:06 nas01 kernel: ahcich3:0:ahcich2: 0:is 00000008 cs 00000000 ss
00000000 rs 00008000 tfd 40 serr 00000000 cmd 00006f17
Dec 1 17:44:06 nas01 kernel: 0): Retrying command
Dec 1 17:44:06 nas01 kernel: (ada2:ahcich2:0:0:0): READ_FPDMA_QUEUED. ACB: 60
80 e8 a9 2f 40 3e 00 00 00 00 00
Dec 1 17:44:06 nas01 kernel: ahcich1: (ada2:ahcich2:0:0:0): CAM status:
Command timeout
pciconf -vl
ahci0@pci0:0:17:0: class=0x010601 card=0x1609103c chip=0x43911002 rev=0x40
hdr=0x00
vendor = 'Advanced Micro Devices [AMD] nee ATI'
device = 'SB7x0/SB8x0/SB9x0 SATA Controller [AHCI mode]'
class = mass storage
subclass = SATA
dmesg:
ahci0: <AMD SB7x0/SB8x0/SB9x0 AHCI SATA controller> port
0xd000-0xd007,0xc000-0xc003,0xb000-0xb007,0xa000-0xa003,0x9000-0x900f mem
0xfe6ffc00-0xfe6fffff irq 19 at device 17.0 on pci0
ahci0: AHCI v1.20 with 4 3Gbps ports, Port Multiplier supported
This issue is reproduceable by causing load (such as zpool scrub). Seems to hit
the issue much more frequently with > 2 disks in the pool - we see it on our HP
microservers with 4 and 5 disks.
Downgrading SATA to v1 (via loader hints) and disabling NCQ (via camcontrol
tags -N 1) seems to delay, not fix the inevitable timeouts.
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