Hi, On today's next-20190116 I see a bug during boot: [ 6.843308] kernel BUG at ../block/bio.c:1833! [ 6.847723] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP ARM ... [ 7.543824] [<c044c144>] (bio_split) from [<00000000>] ( (null)) [ 7.549881] Code: 13833b01 11c630bc e1a00006 e8bd8070 (e7f001f2) (not much in the calltrace) On all my boards. Also QEMU-arm fails. Ultimately the target fails to mount /home from SD card (although root is from NFSv4): Timed out waiting for device dev-disk-by\x2dlabel-home.device. Full console logs: https://krzk.eu/#/builders/25/builds/1079/steps/12/logs/serial0 https://krzk.eu/#/builders/1/builds/3031/steps/12/logs/serial0 1. Arch ARM Linux 2. exynos_defconfig - All my Odroid boards (ARMv7, Exynos) - Odroid HC1, U3, XU3, XU - Systemd 3. All boards boot from TFTP with NFS root (NFSv4) The QEMU arm fails with more information: [ 0.596078] loop: module loaded [ 0.601633] virtio_blk virtio0: [vda] 10240 512-byte logical blocks (5.24 MB/5.00 MiB) [ 0.603320] Internal error: Oops - undefined instruction: 0 [#1] ARM [ 0.603504] Modules linked in: [ 0.603784] CPU: 0 PID: 1 Comm: swapper Tainted: G W 5.0.0-rc2-next-20190116-gcbeb3db #1 [ 0.603905] Hardware name: ARM-Versatile Express [ 0.604329] PC is at bio_split+0x5c/0x64 [ 0.604461] LR is at blk_queue_split+0x47c/0x5f4 [ 0.604553] pc : [<8036e2c4>] lr : [<80376134>] psr: 60000013 [ 0.604652] sp : 8681f878 ip : 00000000 fp : 8699df00 [ 0.604750] r10: 8681f914 r9 : 00000000 r8 : 0000007e [ 0.604838] r7 : 00000000 r6 : 8547ac28 r5 : 00000000 r4 : 00000000 [ 0.604937] r3 : 8547b068 r2 : 00600000 r1 : 00000000 r0 : 8699df00 [ 0.605070] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none [ 0.605185] Control: 10c5387d Table: 60004059 DAC: 00000051 [ 0.605338] Process swapper (pid: 1, stack limit = 0x(ptrval)) ... [ 0.619332] [<8036e2c4>] (bio_split) from [<80376134>] (blk_queue_split+0x47c/0x5f4) [ 0.619480] [<80376134>] (blk_queue_split) from [<8037bee8>] (blk_mq_make_request+0x80/0x3bc) [ 0.619608] [<8037bee8>] (blk_mq_make_request) from [<80371840>] (generic_make_request+0x1b0/0x364) [ 0.619733] [<80371840>] (generic_make_request) from [<80371a8c>] (submit_bio+0x98/0x194) [ 0.619850] [<80371a8c>] (submit_bio) from [<8020e1b8>] (submit_bh_wbc.constprop.21+0x154/0x17c) [ 0.619980] [<8020e1b8>] (submit_bh_wbc.constprop.21) from [<80210634>] (block_read_full_page+0x3b0/0x3d0) [ 0.620109] [<80210634>] (block_read_full_page) from [<8019139c>] (do_read_cache_page+0x180/0x33c) [ 0.620237] [<8019139c>] (do_read_cache_page) from [<8019156c>] (read_cache_page+0x14/0x1c) [ 0.620388] [<8019156c>] (read_cache_page) from [<80383be4>] (read_dev_sector+0x2c/0xbc) [ 0.620508] [<80383be4>] (read_dev_sector) from [<80386e7c>] (read_lba+0x134/0x1b4) [ 0.620623] [<80386e7c>] (read_lba) from [<80387234>] (efi_partition+0xbc/0x8e8) [ 0.620741] [<80387234>] (efi_partition) from [<80386114>] (check_partition+0x11c/0x1e8) [ 0.620856] [<80386114>] (check_partition) from [<80384298>] (rescan_partitions+0x94/0x45c) [ 0.620971] [<80384298>] (rescan_partitions) from [<80213230>] (__blkdev_get+0x260/0x404) [ 0.621087] [<80213230>] (__blkdev_get) from [<802134d8>] (blkdev_get+0x104/0x2f4) [ 0.621206] [<802134d8>] (blkdev_get) from [<80382f9c>] (__device_add_disk+0x498/0x4fc) [ 0.621325] [<80382f9c>] (__device_add_disk) from [<804317f0>] (virtblk_probe+0x444/0x744) [ 0.621444] [<804317f0>] (virtblk_probe) from [<803d3df0>] (virtio_dev_probe+0x258/0x330) [ 0.621561] [<803d3df0>] (virtio_dev_probe) from [<80415864>] (really_probe+0xf4/0x2c8) [ 0.621675] [<80415864>] (really_probe) from [<80415b9c>] (driver_probe_device+0x60/0x16c) [ 0.621788] [<80415b9c>] (driver_probe_device) from [<80415d84>] (__driver_attach+0xdc/0xe0) [ 0.621911] [<80415d84>] (__driver_attach) from [<80413d3c>] (bus_for_each_dev+0x68/0xb4) [ 0.622024] [<80413d3c>] (bus_for_each_dev) from [<80414e04>] (bus_add_driver+0x100/0x20c) [ 0.622137] [<80414e04>] (bus_add_driver) from [<804166b0>] (driver_register+0x78/0x10c) [ 0.622253] [<804166b0>] (driver_register) from [<8091b5e4>] (init+0x70/0x9c) [ 0.622403] [<8091b5e4>] (init) from [<801025ec>] (do_one_initcall+0x54/0x194) [ 0.622525] [<801025ec>] (do_one_initcall) from [<80900e14>] (kernel_init_freeable+0x12c/0x1c8) [ 0.622658] [<80900e14>] (kernel_init_freeable) from [<80628c08>] (kernel_init+0x8/0x110) [ 0.622776] [<80628c08>] (kernel_init) from [<801010e8>] (ret_from_fork+0x14/0x2c) [ 0.622887] Exception stack(0x8681ffb0 to 0x8681fff8) [ 0.623021] ffa0: 00000000 00000000 00000000 00000000 [ 0.623242] ffc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 0.623438] ffe0: 00000000 00000000 00000000 00000000 00000013 00000000 [ 0.623747] Code: 13833b01 11c630bc e1a00006 e8bd8070 (e7f001f2) [ 0.624241] ---[ end trace 925652e8270d42ae ]--- [ 0.624904] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b https://pastebin.com/tKqNv033 QEMU setup: 1. Yocto Linux 2. Custom VF50 defconfig 3. Machine: Vexpress A9 4. DTB: vexpress-v2p-ca9 5. Memory: 128 MB Let me know if you need any more data. Best regards, Krzysztof