I turned on blk-mq for all my test machines today and got a failure from Sun Ultra 1 with Sparc ESP SCSI (dmesg below). Booting with scsi_mod.use_blk_mq=0 fixes the problem. The problem is reproducible. [ 0.000000] PROMLIB: Sun IEEE Boot Prom 'OBP 3.35.0 2004/04/19 12:15' [ 0.000000] PROMLIB: Root node compatible: [ 0.000000] Initializing cgroup subsys cpu [ 0.000000] Linux version 3.17.0-07613-gca32188-dirty (mroos@melon) (gcc version 4.9.1 (Debian 4.9.1-16) ) #56 Mon Oct 13 19:17:41 EEST 2014 [ 0.000000] debug: ignoring loglevel setting. [ 0.000000] bootconsole [earlyprom0] enabled [ 0.000000] ARCH: SUN4U [ 0.000000] Ethernet address: 08:00:20:9f:6b:e4 [ 0.000000] MM: PAGE_OFFSET is 0xfffff80000000000 (max_phys_bits == 40) [ 0.000000] MM: VMALLOC [0x0000000100000000 --> 0x0000060000000000] [ 0.000000] MM: VMEMMAP [0x0000060000000000 --> 0x00000c0000000000] [ 0.000000] Kernel: Using 2 locked TLB entries for main kernel image. [ 0.000000] Remapping the kernel... done. [ 0.000000] OF stdout device is: /sbus@1f,0/zs@f,1100000:a [ 0.000000] PROM: Built device tree with 52656 bytes of memory. [ 0.000000] Top of RAM: 0x33f50000, Total RAM: 0x33f3e000 [ 0.000000] Memory hole size: 0MB [ 0.000000] Allocated 16384 bytes for kernel page tables. [ 0.000000] Zone ranges: [ 0.000000] Normal [mem 0x00000000-0x33f4ffff] [ 0.000000] Movable zone start for each node [ 0.000000] Early memory node ranges [ 0.000000] node 0: [mem 0x00000000-0x33efdfff] [ 0.000000] node 0: [mem 0x33f00000-0x33f2bfff] [ 0.000000] node 0: [mem 0x33f3c000-0x33f4ffff] [ 0.000000] On node 0 totalpages: 106399 [ 0.000000] Normal zone: 832 pages used for memmap [ 0.000000] Normal zone: 0 pages reserved [ 0.000000] Normal zone: 106399 pages, LIFO batch:15 [ 0.000000] Booting Linux... [ 0.000000] CPU CAPS: [flush,stbar,swap,muldiv,v9,mul32,div32,v8plus] [ 0.000000] CPU CAPS: [vis] [ 0.000000] pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768 [ 0.000000] pcpu-alloc: [0] 0 [ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 105567 [ 0.000000] Kernel command line: root=/dev/sda2 ro debug ignore_loglevel [ 0.000000] PID hash table entries: 4096 (order: 2, 32768 bytes) [ 0.000000] Dentry cache hash table entries: 131072 (order: 7, 1048576 bytes) [ 0.000000] Inode-cache hash table entries: 65536 (order: 6, 524288 bytes) [ 0.000000] Sorting __ex_table... [ 0.000000] Memory: 836032K/851192K available (3453K kernel code, 260K rwdata, 824K rodata, 152K init, 399K bss, 15160K reserved) [ 0.000000] NR_IRQS:2048 nr_irqs:2048 1 [ 57.524698] clocksource: mult[6fe6b32] shift[24] [ 57.579457] clockevent: mult[249a8de9] shift[32] [ 57.635375] Console: colour dummy device 80x25 [ 57.687876] console [tty0] enabled [ 57.728458] bootconsole [earlyprom0] disabled [ 0.000000] PROMLIB: Sun IEEE Boot Prom 'OBP 3.35.0 2004/04/19 12:15' [ 0.000000] PROMLIB: Root node compatible: [ 0.000000] Initializing cgroup subsys cpu [ 0.000000] Linux version 3.17.0-07613-gca32188-dirty (mroos@melon) (gcc version 4.9.1 (Debian 4.9.1-16) ) #56 Mon Oct 13 19:17:41 EEST 2014 [ 0.000000] debug: ignoring loglevel setting. [ 0.000000] bootconsole [earlyprom0] enabled [ 0.000000] ARCH: SUN4U [ 0.000000] Ethernet address: 08:00:20:9f:6b:e4 [ 0.000000] MM: PAGE_OFFSET is 0xfffff80000000000 (max_phys_bits == 40) [ 0.000000] MM: VMALLOC [0x0000000100000000 --> 0x0000060000000000] [ 0.000000] MM: VMEMMAP [0x0000060000000000 --> 0x00000c0000000000] [ 0.000000] Kernel: Using 2 locked TLB entries for main kernel image. [ 0.000000] Remapping the kernel... done. [ 0.000000] OF stdout device is: /sbus@1f,0/zs@f,1100000:a [ 0.000000] PROM: Built device tree with 52656 bytes of memory. [ 0.000000] Top of RAM: 0x33f50000, Total RAM: 0x33f3e000 [ 0.000000] Memory hole size: 0MB [ 0.000000] Allocated 16384 bytes for kernel page tables. [ 0.000000] Zone ranges: [ 0.000000] Normal [mem 0x00000000-0x33f4ffff] [ 0.000000] Movable zone start for each node [ 0.000000] Early memory node ranges [ 0.000000] node 0: [mem 0x00000000-0x33efdfff] [ 0.000000] node 0: [mem 0x33f00000-0x33f2bfff] [ 0.000000] node 0: [mem 0x33f3c000-0x33f4ffff] [ 0.000000] On node 0 totalpages: 106399 [ 0.000000] Normal zone: 832 pages used for memmap [ 0.000000] Normal zone: 0 pages reserved [ 0.000000] Normal zone: 106399 pages, LIFO batch:15 [ 0.000000] Booting Linux... [ 0.000000] CPU CAPS: [flush,stbar,swap,muldiv,v9,mul32,div32,v8plus] [ 0.000000] CPU CAPS: [vis] [ 0.000000] pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768 [ 0.000000] pcpu-alloc: [0] 0 [ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 105567 [ 0.000000] Kernel command line: root=/dev/sda2 ro debug ignore_loglevel [ 0.000000] PID hash table entries: 4096 (order: 2, 32768 bytes) [ 0.000000] Dentry cache hash table entries: 131072 (order: 7, 1048576 bytes) [ 0.000000] Inode-cache hash table entries: 65536 (order: 6, 524288 bytes) [ 0.000000] Sorting __ex_table... [ 0.000000] Memory: 836032K/851192K available (3453K kernel code, 260K rwdata, 824K rodata, 152K init, 399K bss, 15160K reserved) [ 0.000000] NR_IRQS:2048 nr_irqs:2048 1 [ 57.524698] clocksource: mult[6fe6b32] shift[24] [ 57.579457] clockevent: mult[249a8de9] shift[32] [ 57.635375] Console: colour dummy device 80x25 [ 57.687876] console [tty0] enabled [ 57.728458] bootconsole [earlyprom0] disabled [ 57.930716] Calibrating delay using timer specific routine.. 286.82 BogoMIPS (lpj=1434111) [ 57.930833] pid_max: default: 32768 minimum: 301 [ 57.931505] Mount-cache hash table entries: 2048 (order: 1, 16384 bytes) [ 57.931607] Mountpoint-cache hash table entries: 2048 (order: 1, 16384 bytes) [ 57.934712] Initializing cgroup subsys net_cls [ 57.934835] Initializing cgroup subsys blkio [ 57.939070] devtmpfs: initialized [ 57.950915] NET: Registered protocol family 16 [ 57.966431] SYSIO: UPA portID ffffffff, at 000001fe00000000 [ 57.997222] SCSI subsystem initialized [ 58.001006] /sbus@1f,0/eeprom@f,1200000: Mostek regs at 0x1fff1200000 [ 58.002807] AUXIO: Found device at /sbus@1f,0/auxio@f,1900000 [ 58.003132] Switched to clocksource tick [ 58.034939] NET: Registered protocol family 2 [ 58.037991] TCP established hash table entries: 8192 (order: 3, 65536 bytes) [ 58.038520] TCP bind hash table entries: 8192 (order: 3, 65536 bytes) [ 58.039006] TCP: Hash tables configured (established 8192 bind 8192) [ 58.039635] TCP: reno registered [ 58.039743] UDP hash table entries: 512 (order: 1, 16384 bytes) [ 58.039934] UDP-Lite hash table entries: 512 (order: 1, 16384 bytes) [ 58.040912] NET: Registered protocol family 1 [ 58.045390] futex hash table entries: 256 (order: -1, 6144 bytes) [ 58.047786] HugeTLB registered 8 MB page size, pre-allocated 0 pages [ 58.052426] msgmni has been set to 1632 [ 58.056218] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 253) [ 58.056410] io scheduler noop registered [ 58.056536] io scheduler deadline registered [ 58.056799] io scheduler cfq registered (default) [ 58.059858] zs f005a290: ttyS0 at MMIO 0x1fff1100000 (irq = 9, base_baud = 307200) is a zs [ 58.060010] Console: ttyS0 (SunZilog zs0) [ 62.880751] console [ttyS0] enabled [ 62.922660] [sched_delayed] sched: RT throttling activated [ 62.988320] zs f005a290: ttyS1 at MMIO 0x1fff1100004 (irq = 9, base_baud = 307200) is a zs [ 63.088878] f005b730: Keyboard at MMIO 0x1fff1000000 (irq = 9) is a zs [ 63.165231] f005b730: Mouse at MMIO 0x1fff1000004 (irq = 9) is a zs [ 63.244199] esp: esp0, regs[1ffe8800000:1ffe8400000] irq[10] [ 63.310055] esp: esp0 is a FAS100A, 40 MHz (ccf=0), SCSI ID 7 [ 66.383895] scsi host0: esp [ 148.437533] scsi 0:0:0:0: timing out command, waited 82s [ 149.674112] ESP: unexpected IREG 40 [ 149.713889] esp: esp0: Dumping command log [ 149.762847] esp: esp0: ent[14] CMD val[01] sreg[93] seqreg[04] sreg2[00] ireg[18] ss[00] event[0d] [ 149.870182] esp: esp0: ent[15] CMD val[11] sreg[93] seqreg[04] sreg2[00] ireg[18] ss[00] event[0d] [ 149.977486] esp: esp0: ent[16] EVENT val[0b] sreg[93] seqreg[04] sreg2[00] ireg[18] ss[00] event[0d] [ 150.086871] esp: esp0: ent[17] CMD val[12] sreg[97] seqreg[04] sreg2[00] ireg[08] ss[00] event[0b] [ 150.194174] esp: esp0: ent[18] EVENT val[0c] sreg[97] seqreg[04] sreg2[00] ireg[08] ss[00] event[0b] [ 150.303555] esp: esp0: ent[19] CMD val[44] sreg[90] seqreg[04] sreg2[00] ireg[20] ss[00] event[0c] [ 150.410858] esp: esp0: ent[20] CMD val[c6] sreg[90] seqreg[04] sreg2[00] ireg[20] ss[01] event[0c] [ 150.518165] esp: esp0: ent[21] CMD val[44] sreg[80] seqreg[00] sreg2[00] ireg[20] ss[00] event[0c] [ 150.625463] esp: esp0: ent[22] CMD val[c6] sreg[80] seqreg[00] sreg2[00] ireg[20] ss[01] event[0c] [ 150.732768] esp: esp0: ent[23] CMD val[44] sreg[80] seqreg[00] sreg2[00] ireg[20] ss[00] event[0c] [ 150.840072] esp: esp0: ent[24] CMD val[c6] sreg[80] seqreg[00] sreg2[00] ireg[20] ss[01] event[0c] [ 150.947372] esp: esp0: ent[25] CMD val[44] sreg[80] seqreg[00] sreg2[00] ireg[20] ss[00] event[0c] [ 151.054677] esp: esp0: ent[26] CMD val[c6] sreg[80] seqreg[00] sreg2[00] ireg[20] ss[01] event[0c] [ 151.161975] esp: esp0: ent[27] CMD val[44] sreg[80] seqreg[00] sreg2[00] ireg[20] ss[00] event[0c] [ 151.269279] esp: esp0: ent[28] CMD val[c6] sreg[80] seqreg[00] sreg2[00] ireg[20] ss[01] event[0c] [ 151.376586] esp: esp0: ent[29] CMD val[44] sreg[80] seqreg[00] sreg2[00] ireg[20] ss[00] event[0c] [ 151.483884] esp: esp0: ent[30] CMD val[c6] sreg[80] seqreg[00] sreg2[00] ireg[20] ss[01] event[0c] [ 151.591191] esp: esp0: ent[31] EVENT val[0d] sreg[87] seqreg[02] sreg2[00] ireg[18] ss[00] event[0c] [ 151.700572] esp: esp0: ent[0] EVENT val[06] sreg[87] seqreg[02] sreg2[00] ireg[18] ss[00] event[0d] [ 151.808918] esp: esp0: ent[1] CMD val[01] sreg[87] seqreg[02] sreg2[00] ireg[18] ss[00] event[06] [ 151.915180] esp: esp0: ent[2] CMD val[10] sreg[87] seqreg[02] sreg2[00] ireg[18] ss[00] event[06] [ 152.021438] esp: esp0: ent[3] CMD val[1a] sreg[87] seqreg[02] sreg2[00] ireg[08] ss[00] event[06] [ 152.127700] esp: esp0: ent[4] CMD val[12] sreg[87] seqreg[02] sreg2[00] ireg[08] ss[00] event[06] [ 152.233958] esp: esp0: ent[5] EVENT val[0d] sreg[87] seqreg[02] sreg2[00] ireg[08] ss[00] event[06] [ 152.342305] esp: esp0: ent[6] EVENT val[09] sreg[86] seqreg[02] sreg2[00] ireg[10] ss[00] event[0d] [ 152.450651] esp: esp0: ent[7] CMD val[01] sreg[86] seqreg[02] sreg2[00] ireg[10] ss[00] event[09] [ 152.556907] esp: esp0: ent[8] CMD val[10] sreg[86] seqreg[02] sreg2[00] ireg[10] ss[00] event[09] [ 152.663169] esp: esp0: ent[9] EVENT val[0a] sreg[86] seqreg[02] sreg2[00] ireg[10] ss[00] event[09] [ 152.771518] esp: esp0: ent[10] EVENT val[0d] sreg[80] seqreg[02] sreg2[00] ireg[20] ss[00] event[0a] [ 152.880898] esp: esp0: ent[11] EVENT val[04] sreg[80] seqreg[02] sreg2[00] ireg[20] ss[00] event[0d] [ 152.990289] esp: esp0: ent[12] CMD val[90] sreg[80] seqreg[02] sreg2[00] ireg[20] ss[00] event[04] [ 153.097589] esp: esp0: ent[13] EVENT val[05] sreg[80] seqreg[02] sreg2[00] ireg[20] ss[00] event[04] [ 153.209036] esp: esp1, regs[1ff08810000:1ff08800000] irq[14] [ 153.274954] esp: esp1 is a FASHME, 40 MHz (ccf=0), SCSI ID 7 [ 156.347855] scsi host1: esp [ 159.895509] mousedev: PS/2 mouse device common for all mice [ 159.963193] rtc-m48t59 rtc-m48t59.0: rtc core: registered m48t59 as rtc0 [ 160.043367] TCP: cubic registered [ 160.081194] NET: Registered protocol family 17 [ 160.134524] Key type dns_resolver registered [ 160.194533] rtc-m48t59 rtc-m48t59.0: setting system clock to 2014-10-13 21:40:47 UTC (1413236447) [ 160.958857] input: Sun Mouse as /devices/root/f0059940/f005b730/serio1/input/input1 [ 161.050132] VFS: Cannot open root device "sda2" or unknown-block(0,0): error -6 [ 161.136193] Please append a correct "root=" boot option; here are the available partitions: [ 161.236197] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) [ 161.335119] CPU: 0 PID: 1 Comm: swapper Not tainted 3.17.0-07613-gca32188-dirty #56 [ 161.426769] Call Trace: [ 161.455930] [000000000087ce48] mount_block_root+0x1f8/0x284 [ 161.523644] [000000000087d0a8] prepare_namespace+0x170/0x1b0 [ 161.592402] [000000000087cb20] kernel_init_freeable+0x1a8/0x1b8 [ 161.664296] [000000000075c264] kernel_init+0x4/0x100 [ 161.724712] [0000000000405f84] ret_from_fork+0x1c/0x2c [ 161.787191] [0000000000000000] (null) [ 161.842406] Press Stop-A (L1-A) to return to the boot prom [ 161.908038] ---[ end Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) -- Meelis Roos (mroos@xxxxxxxx) -- To unsubscribe from this list: send the line "unsubscribe sparclinux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
