On Thu, 23 Jul 2020 09:25:51 +1000, Finn Thain wrote:
> Booting Linux with a Conner CP3200 drive attached to the MESH SCSI bus
> results in EH measures and a panic:
>
> [ 25.499838] mesh: configured for synchronous 5 MB/s
> [ 25.787154] mesh: performing initial bus reset...
> [ 29.867115] scsi host0: MESH
> [ 29.929527] mesh: target 0 synchronous at 3.6 MB/s
> [ 29.998763] scsi 0:0:0:0: Direct-Access CONNER CP3200-200mb-3.5 4040 PQ: 0 ANSI: 1 CCS
> [ 31.989975] sd 0:0:0:0: [sda] 415872 512-byte logical blocks: (213 MB/203 MiB)
> [ 32.070975] sd 0:0:0:0: [sda] Write Protect is off
> [ 32.137197] sd 0:0:0:0: [sda] Mode Sense: 5b 00 00 08
> [ 32.209661] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
> [ 32.332708] sda: [mac] sda1 sda2 sda3
> [ 32.417733] sd 0:0:0:0: [sda] Attached SCSI disk
> ... snip ...
> [ 76.687067] mesh_abort((ptrval))
> [ 76.743606] mesh: state at (ptrval), regs at (ptrval), dma at (ptrval)
> [ 76.810798] ct=6000 seq=86 bs=4017 fc= 0 exc= 0 err= 0 im= 7 int= 0 sp=85
> [ 76.880720] dma stat=84e0 cmdptr=1f73d000
> [ 76.941387] phase=4 msgphase=0 conn_tgt=0 data_ptr=24576
> [ 77.005567] dma_st=1 dma_ct=0 n_msgout=0
> [ 77.065456] target 0: req=(ptrval) goes_out=0 saved_ptr=0
> [ 77.130512] mesh_abort((ptrval))
> [ 77.187670] mesh: state at (ptrval), regs at (ptrval), dma at (ptrval)
> [ 77.255594] ct=6000 seq=86 bs=4017 fc= 0 exc= 0 err= 0 im= 7 int= 0 sp=85
> [ 77.325778] dma stat=84e0 cmdptr=1f73d000
> [ 77.387239] phase=4 msgphase=0 conn_tgt=0 data_ptr=24576
> [ 77.453665] dma_st=1 dma_ct=0 n_msgout=0
> [ 77.515900] target 0: req=(ptrval) goes_out=0 saved_ptr=0
> [ 77.582902] mesh_host_reset
> [ 88.187083] Kernel panic - not syncing: mesh: double DMA start !
> [ 88.254510] CPU: 0 PID: 358 Comm: scsi_eh_0 Not tainted 5.6.13-pmac #1
> [ 88.323302] Call Trace:
> [ 88.378854] [e16ddc58] [c0027080] panic+0x13c/0x308 (unreliable)
> [ 88.446221] [e16ddcb8] [c02b2478] mesh_start.part.12+0x130/0x414
> [ 88.513298] [e16ddcf8] [c02b2fc8] mesh_queue+0x54/0x70
> [ 88.577097] [e16ddd18] [c02a1848] scsi_send_eh_cmnd+0x374/0x384
> [ 88.643476] [e16dddc8] [c02a1938] scsi_eh_tur+0x5c/0xb8
> [ 88.707878] [e16dddf8] [c02a1ab8] scsi_eh_test_devices+0x124/0x178
> [ 88.775663] [e16dde28] [c02a2094] scsi_eh_ready_devs+0x588/0x8a8
> [ 88.843124] [e16dde98] [c02a31d8] scsi_error_handler+0x344/0x520
> [ 88.910697] [e16ddf08] [c00409c8] kthread+0xe4/0xe8
> [ 88.975166] [e16ddf38] [c000f234] ret_from_kernel_thread+0x14/0x1c
> [ 89.044112] Rebooting in 180 seconds..
>
> [...]
Applied to 5.9/scsi-queue, thanks!
[1/1] scsi: mesh: Fix panic after host or bus reset
https://git.kernel.org/mkp/scsi/c/edd7dd2292ab
--
Martin K. Petersen Oracle Linux Engineering
