Image location: http://autobuilder.yoctoproject.org/pub/releases/yocto-2.2.rc6/ This is a regression bug, used to work with old runqemu. Case on testopia: https://bugzilla.yoctoproject.org/tr_show_case.cgi?case_id=315 Steps: 1. Download toolchain tarball and qemu rootfs. 2. Install toolchain and set the environment 3. Run runqemu-extract-sdk to extract the qemu rootfs in rootfs1 directory and rootfs2 directory. 4. From 2 terminals, run "runqemu qemuboot.conf rootfs1" and run "runqemu qemuboot.conf rootfs2" to launch 2 qemu system at the same time. The expected result should be the 2 qemu system can launch respectively. But now only one system can boot up and the other one can not boot up with kernel panic: >> ============================================================= >> OpenBIOS 1.1 [Jul 19 2016 06:34] >> Configuration device id QEMU version 1 machine id 1 >> CPUs: 1 >> Memory: 256M >> UUID: 00000000-0000-0000-0000-000000000000 >> CPU type PowerPC,G4 milliseconds isn't unique. Welcome to OpenBIOS v1.1 built on Jul 19 2016 06:34 >> [ppc] Kernel already loaded (0x01000000 + 0x00ac2300) (initrd 0x00000000 + 0x00000000) >> [ppc] Kernel command line: root=/dev/nfs nfsroot=192.168.7.1:/buildarea/jenkins-yocto/images/image2,nfsvers=3,port=3051,mountprog=21112,nfsprog=11112,udp,mountport=3050 rw highres=off console=ttyS0 mem=256M ip=192.168.7.4::192.168.7.3:255.255.255.0 console=tty console=ttyS0 OF stdout device is: /pci@f2000000/mac-io@c/escc-legacy@12000/ch-b@12000 Preparing to boot Linux version 4.8.3-yocto-standard (pokybuild@ubuntu1604) (gcc version 6.2.0 (GCC) ) #1 PREEMPT Wed Oct 26 09:14:16 UTC 2016 Detected machine type: 00000400 command line: memory layout at init: memory_limit : 00000000 (16 MB aligned) alloc_bottom : 01ac7000 alloc_top : 10000000 alloc_top_hi : 10000000 rmo_top : 10000000 ram_top : 10000000 found display : /pci@f2000000/QEMU,VGA@e, opening... done copying OF device tree... Building dt strings... Building dt structure... Device tree strings 0x01ac8000 -> 0x01ac8557 Device tree struct 0x01ac9000 -> 0x01acc000 Quiescing Open Firmware ... Booting Linux via __start() @ 0x01000000 ... [ 0.036964] console [ttyS0] enabled [ 0.037687] bootconsole [udbg0] disabled [ 0.038796] pid_max: default: 32768 minimum: 301 [ 0.040801] Security Framework initialized [ 0.043844] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes) [ 0.044442] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes) [ 0.063068] ftrace: allocating 21783 entries in 64 pages [ 0.218315] devtmpfs: initialized [ 0.237877] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645041785100000 ns [ 0.240643] xor: measuring software checksum speed [ 0.279529] 8regs : 467.000 MB/sec [ 0.320049] 8regs_prefetch: 410.000 MB/sec [ 0.360646] 32regs : 498.000 MB/sec [ 0.401270] 32regs_prefetch: 404.000 MB/sec [ 0.443886] altivec : 733.000 MB/sec [ 0.457242] xor: using function: altivec (733.000 MB/sec) [ 0.478544] NET: Registered protocol family 16 [ 0.495313] PCI: Probing PCI hardware [ 0.497893] PCI host bridge to bus 0000:00 [ 0.499067] pci_bus 0000:00: root bus resource [io 0x0000-0x7fffff] [ 0.499672] pci_bus 0000:00: root bus resource [mem 0x80000000-0x8fffffff] [ 0.500569] pci_bus 0000:00: root bus resource [bus 00-ff] [ 0.567497] pci 0000:00:0f.0: reg 0x20: can't handle BAR above 4GB (bus address 0xffffffff82800000) [ 0.582764] pci 0000:00:0f.0: BAR 4: assigned [mem 0x80800000-0x80ffffff 64bit pref] [ 0.722255] raid6: altivecx1 gen() 247 MB/s [ 0.794051] raid6: altivecx2 gen() 285 MB/s [ 0.863032] raid6: altivecx4 gen() 300 MB/s [ 0.932151] raid6: altivecx8 gen() 252 MB/s [ 1.001037] raid6: int32x1 gen() 236 MB/s [ 1.071608] raid6: int32x1 xor() 180 MB/s [ 1.140734] raid6: int32x2 gen() 351 MB/s [ 1.209686] raid6: int32x2 xor() 266 MB/s [ 1.278969] raid6: int32x4 gen() 144 MB/s [ 1.347947] raid6: int32x4 xor() 295 MB/s [ 1.417087] raid6: int32x8 gen() 180 MB/s [ 1.485920] raid6: int32x8 xor() 145 MB/s [ 1.486302] raid6: using algorithm int32x2 gen() 351 MB/s [ 1.486748] raid6: .... xor() 266 MB/s, rmw enabled [ 1.487225] raid6: using intx1 recovery algorithm [ 1.498545] vgaarb: setting as boot device: PCI:0000:00:0e.0 [ 1.499288] vgaarb: device added: PCI:0000:00:0e.0,decodes=io+mem,owns=io+mem,locks=none [ 1.500306] vgaarb: loaded [ 1.500602] vgaarb: bridge control possible 0000:00:0e.0 [ 1.504383] usbcore: registered new interface driver usbfs [ 1.505277] usbcore: registered new interface driver hub [ 1.506131] usbcore: registered new device driver usb [ 1.525782] clocksource: Switched to clocksource timebase [ 1.767961] NET: Registered protocol family 2 [ 1.779021] TCP established hash table entries: 2048 (order: 1, 8192 bytes) [ 1.779767] TCP bind hash table entries: 2048 (order: 1, 8192 bytes) [ 1.780566] TCP: Hash tables configured (established 2048 bind 2048) [ 1.782596] UDP hash table entries: 256 (order: 0, 4096 bytes) [ 1.783234] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes) [ 1.785722] NET: Registered protocol family 1 [ 1.790232] RPC: Registered named UNIX socket transport module. [ 1.790802] RPC: Registered udp transport module. [ 1.791196] RPC: Registered tcp transport module. [ 1.791576] RPC: Registered tcp NFSv4.1 backchannel transport module. [ 1.811043] futex hash table entries: 256 (order: -1, 3072 bytes) [ 1.817471] workingset: timestamp_bits=14 max_order=16 bucket_order=2 [ 1.876228] NFS: Registering the id_resolver key type [ 1.878240] Key type id_resolver registered [ 1.878664] Key type id_legacy registered [ 1.904147] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 253) [ 1.905006] io scheduler noop registered [ 1.906338] io scheduler deadline registered [ 1.906937] io scheduler cfq registered (default) [ 1.912703] Using unsupported 800x600 QEMU,VGA at 81000000, depth=32, pitch=3200 [ 1.936090] Console: switching to colour frame buffer device 100x37 [ 1.948746] fb0: Open Firmware frame buffer device on /pci@f2000000/QEMU,VGA@e [ 1.955957] pmac_zilog: 0.6 (Benjamin Herrenschmidt <benh@kernel.crashing.org>) [ 2.015224] brd: module loaded [ 2.018380] MacIO PCI driver attached to Keylargo chipset [ 2.029029] 0.00013020:ch-a: ttyS0 at MMIO 0x80013020 (irq = 37, base_baud = 230400) is a Z85c30 ESCC - Serial port [ 2.032435] 0.00013000:ch-b: ttyS1 at MMIO 0x80013000 (irq = 36, base_baud = 230400) is a Z85c30 ESCC - Serial port [ 2.037552] Macintosh CUDA driver v0.5 for Unified ADB. [ 2.040118] Uniform Multi-Platform E-IDE driver [ 2.043039] adb: starting probe task... [ 2.136838] ADB keyboard at 2, handler set to 3 [ 2.146367] Detected ADB keyboard, type ANSI. [ 2.155863] input: ADB keyboard as /devices/virtual/input/input0 [ 2.169020] random: fast init done [ 2.208281] ADB mouse at 3, handler set to 2 [ 2.216383] input: ADB mouse as /devices/virtual/input/input1 [ 2.223836] adb: finished probe task... [ 3.097240] ide-pmac: Found Apple KeyLargo ATA-3 controller (macio), bus ID 0, irq 16 [ 3.714061] ide0 at 0xd107e000-0xd107e070,0xd107e160 on irq 16 [ 4.761225] ide-pmac: Found Apple KeyLargo ATA-3 controller (macio), bus ID 1, irq 18 [ 5.197715] hdc: QEMU DVD-ROM, ATAPI CD/DVD-ROM drive [ 5.927134] hdc: MWDMA2 mode selected [ 5.935647] ide1 at 0xd1288000-0xd1288070,0xd1288160 on irq 18 [ 5.946458] ide-gd driver 1.18 [ 5.963391] pcnet32: pcnet32.c:v1.35 21.Apr.2008 tsbogend@alpha.franken.de [ 5.973210] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver [ 5.981303] ehci-pci: EHCI PCI platform driver [ 5.989386] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver [ 5.997452] ohci-pci: OHCI PCI platform driver [ 6.007340] ohci-pci 0000:00:0d.0: OHCI PCI host controller [ 6.016738] ohci-pci 0000:00:0d.0: new USB bus registered, assigned bus number 1 [ 6.026367] ohci-pci 0000:00:0d.0: irq 27, io mem 0x80080000 [ 6.103843] hub 1-0:1.0: USB hub found [ 6.112897] hub 1-0:1.0: 3 ports detected [ 6.124708] uhci_hcd: USB Universal Host Controller Interface driver [ 6.137544] mousedev: PS/2 mouse device common for all mice [ 6.148234] md: linear personality registered for level -1 [ 6.156286] md: raid0 personality registered for level 0 [ 6.163913] md: raid1 personality registered for level 1 [ 6.171406] md: raid10 personality registered for level 10 [ 6.178790] md: multipath personality registered for level -4 [ 6.186000] md: faulty personality registered for level -5 [ 6.195084] device-mapper: ioctl: 4.35.0-ioctl (2016-06-23) initialised: dm-devel@redhat.com [ 6.207177] usbcore: registered new interface driver usbhid [ 6.214550] usbhid: USB HID core driver [ 6.221596] oprofile: using timer interrupt. [ 6.232000] u32 classifier [ 6.239000] Actions configured [ 6.250001] NET: Registered protocol family 10 [ 6.266630] sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver [ 6.277830] NET: Registered protocol family 17 [ 6.285846] Key type dns_resolver registered [ 6.303873] Btrfs loaded, crc32c=crc32c-generic [ 6.316377] console [netcon0] enabled [ 6.323643] netconsole: network logging started [ 6.376084] IP-Config: Complete: [ 6.383070] device=eth0, hwaddr=52:54:00:12:34:04, ipaddr=192.168.7.4, mask=255.255.255.0, gw=192.168.7.3 [ 6.396720] host=192.168.7.4, domain=, nis-domain=(none) [ 6.403857] bootserver=255.255.255.255, rootserver=192.168.7.1, rootpath= [ 6.420710] md: Waiting for all devices to be available before autodetect [ 6.427997] md: If you don't use raid, use raid=noautodetect [ 6.440068] md: Autodetecting RAID arrays. [ 6.447215] md: Scanned 0 and added 0 devices. [ 6.454452] md: autorun ... [ 6.460952] md: ... autorun DONE. [ 6.513478] usb 1-1: new full-speed USB device number 2 using ohci-pci [ 6.762229] input: QEMU QEMU USB Tablet as /devices/pci0000:00/0000:00:0d.0/usb1/1-1/1-1:1.0/0003:0627:0001.0001/input/input2 [ 6.777550] hid-generic 0003:0627:0001.0001: input: USB HID v0.01 Pointer [QEMU QEMU USB Tablet] on usb-0000:00:0d.0-1/input0 [ 322.617498] VFS: Unable to mount root fs via NFS, trying floppy. [ 322.632058] VFS: Cannot open root device "nfs" or unknown-block(2,0): error -6 [ 322.640102] Please append a correct "root=" boot option; here are the available partitions: [ 322.648426] 0100 4096 ram0 (driver?) [ 322.656317] 0101 4096 ram1 (driver?) [ 322.663975] 0102 4096 ram2 (driver?) [ 322.671470] 0103 4096 ram3 (driver?) [ 322.678748] 0104 4096 ram4 (driver?) [ 322.685762] 0105 4096 ram5 (driver?) [ 322.692514] 0106 4096 ram6 (driver?) [ 322.699144] 0107 4096 ram7 (driver?) [ 322.705723] 0108 4096 ram8 (driver?) [ 322.712226] 0109 4096 ram9 (driver?) [ 322.718777] 010a 4096 ram10 (driver?) [ 322.725231] 010b 4096 ram11 (driver?) [ 322.731464] 010c 4096 ram12 (driver?) [ 322.737672] 010d 4096 ram13 (driver?) [ 322.743711] 010e 4096 ram14 (driver?) [ 322.749757] 010f 4096 ram15 (driver?) [ 322.755727] VFS: Unable to mount root fs on unknown-block(2,0) [ 322.761788] User configuration error - no valid root filesystem found [ 322.768077] Kernel panic - not syncing: Invalid configuration from end user prevents continuing [ 322.774679] CPU: 0 PID: 1 Comm: swapper Not tainted 4.8.3-yocto-standard #1 [ 322.781000] Call Trace: [ 322.787283] [cf8a9db0] [c07376a0] panic+0x118/0x260 (unreliable) [ 322.793612] [cf8a9e10] [c0937628] mount_block_root+0x250/0x298 [ 322.799680] [cf8a9e60] [c09378b8] mount_root+0x110/0x124 [ 322.805545] [cf8a9e90] [c0937a50] prepare_namespace+0x184/0x1cc [ 322.811415] [cf8a9eb0] [c0937154] kernel_init_freeable+0x248/0x264 [ 322.817315] [cf8a9f30] [c000481c] kernel_init+0x24/0x128 [ 322.823143] [cf8a9f40] [c0011acc] ret_from_kernel_thread+0x5c/0x64 [ 322.829721] Rebooting in 180 seconds..
This issue still happens on 2.3 M1 rc1 build
http://git.yoctoproject.org/cgit.cgi/poky/commit/?id=5ea3627dbb61ab065be8737c46007d7d8d7f3501
Verified with 2.3 M2 RC3. Git rev: master/226a508da955439b881b2f0a544a3aee76e59919