On Thu, Jan 14 2016, Roman Mamedov wrote: > Hello, > > I am trying to run mdadm on an ARM system with 64 MB of RAM. > > mdadm --assemble --scan results in the following error. > mdadm --detail /dev/md4 locks up indefinitely. > > It is a 2-member degraded RAID1 of 1.5 TB disks, previously created on amd64 PC. > > I remember mdadm working on this configuration before, maybe not with this array. > In fact the stock OS of the device uses mdadm to provide RAID functionality too. > > Currently I am using Debian Wheezy with kernel 3.2.68 and mdadm 3.2.5. > > Any ideas? It is the kernel crashing, not the "mdadm" program itself. It looks like some weird data corruption. The sync_page_io function allocates a bio, uses it to submit and wait for a read to read the superblock off a device. Then when it all bio_put() to free the bio, the bio turns out to be partly corrupted. All I can suggest is to try a different/newer kernel. NeilBrown > > [Thu Jan 14 12:37:38 2016] md: md4 stopped. > [Thu Jan 14 12:37:38 2016] md: bind<sda3> > [Thu Jan 14 12:37:38 2016] md: raid1 personality registered for level 1 > [Thu Jan 14 12:37:38 2016] bio: create slab <bio-1> at 1 > [Thu Jan 14 12:37:38 2016] md/raid1:md4: active with 1 out of 2 mirrors > [Thu Jan 14 12:37:38 2016] Unable to handle kernel paging request at virtual address 01314289 > [Thu Jan 14 12:37:38 2016] pgd = c2ea8000 > [Thu Jan 14 12:37:38 2016] [01314289] *pgd=00000000 > [Thu Jan 14 12:37:38 2016] Internal error: Oops: 1 [#1] > [Thu Jan 14 12:37:38 2016] Modules linked in: raid1 md_mod fuse tcp_illinois ipv6 evdev mv643xx_eth inet_lro lm75 g760a gpio_keys usb_storage ext4 crc16 mbcache jbd2 sg sd_mod crc_t10dif sata_mv libata ehci_hcd usbcore scsi_mod usb_common > [Thu Jan 14 12:37:38 2016] CPU: 0 Not tainted (3.2.0-4-orion5x #1 Debian 3.2.68-1+deb7u6) > [Thu Jan 14 12:37:38 2016] PC is at mddev_bio_destructor+0x4/0xc [md_mod] > [Thu Jan 14 12:37:38 2016] LR is at bio_put+0x44/0x48 > [Thu Jan 14 12:37:38 2016] pc : [<bf23993c>] lr : [<c00f0c68>] psr: 60000013 > [Thu Jan 14 12:37:38 2016] sp : c38dfd10 ip : c38e2044 fp : 00000000 > [Thu Jan 14 12:37:38 2016] r10: 00000200 r9 : 00000000 r8 : 00000008 > [Thu Jan 14 12:37:38 2016] r7 : 00000001 r6 : 00000010 r5 : f0000009 r4 : c2f7c724 > [Thu Jan 14 12:37:38 2016] r3 : 01314011 r2 : 00000000 r1 : 20000013 r0 : c2f7c724 > [Thu Jan 14 12:37:38 2016] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user > [Thu Jan 14 12:37:38 2016] Control: a005317f Table: 02ea8000 DAC: 00000015 > [Thu Jan 14 12:37:38 2016] Process mdadm (pid: 1777, stack limit = 0xc38de270) > [Thu Jan 14 12:37:38 2016] Stack: (0xc38dfd10 to 0xc38e0000) > [Thu Jan 14 12:37:38 2016] fd00: 20000013 bf239a50 60000013 00000000 > [Thu Jan 14 12:37:38 2016] fd20: c38dfd20 c38dfd20 00000000 c04c1cc0 c326baa0 c39db810 00000001 00000000 > [Thu Jan 14 12:37:38 2016] fd40: 00000001 bf24232c 00000200 c04c1cc0 00000000 00000001 00000008 00000000 > [Thu Jan 14 12:37:38 2016] fd60: bf248298 00000000 00000000 c321e7a0 c2d6a0e0 c39db800 bf23fd90 ad7175da > [Thu Jan 14 12:37:38 2016] fd80: 00000008 bf245150 00000000 00000000 00000100 c39db898 becfe538 c0290f84 > [Thu Jan 14 12:37:38 2016] fda0: bf25c2fc c38dfdb4 ad7175da 00000000 c321ee20 c39db800 00000000 c39db810 > [Thu Jan 14 12:37:38 2016] fdc0: 00000000 bf25c514 bf23fd90 c39db898 becfe538 bf240060 00000000 c38dfdfc > [Thu Jan 14 12:37:38 2016] fde0: c3402c80 c39db810 c2f5e320 c00f35d0 c39db800 c39db800 c39db810 c326baa0 > [Thu Jan 14 12:37:38 2016] fe00: c3496ac0 bf2458b0 0000000f 00000000 00000000 00000000 00000000 00000000 > [Thu Jan 14 12:37:38 2016] fe20: 00000000 00000000 00000000 c39db800 c39db800 00000000 c3496ac0 400c0930 > [Thu Jan 14 12:37:38 2016] fe40: c38de000 00000000 becfe538 bf2402c4 400c0930 c39db800 00000000 bf241878 > [Thu Jan 14 12:37:38 2016] fe60: 00000002 00000008 00000003 00000000 00000006 c00f9330 c2e79a40 c3869508 > [Thu Jan 14 12:37:38 2016] fe80: c397b428 c397b428 c2cd0f00 c2e79a40 c397b428 c2cd0f00 c3869508 00000000 > [Thu Jan 14 12:37:38 2016] fea0: c397b428 c00fab20 00000000 c3496ac0 c2fbf400 400c0930 0000009f c38de000 > [Thu Jan 14 12:37:38 2016] fec0: 00000000 c015ebc0 00000000 c015f514 000000d0 c38dff78 bf0b8a70 c2e27800 > [Thu Jan 14 12:37:38 2016] fee0: c2e27800 c3496ac0 c3402c90 bf000fbc 00000007 bf0c94c8 c2d1de00 00000000 > [Thu Jan 14 12:37:38 2016] ff00: c3267e38 00000004 00000004 00000000 c38de000 00000000 becfe538 c00d609c > [Thu Jan 14 12:37:38 2016] ff20: c3402740 00000000 0000009f c2e7ac00 c3402750 bf0c96f8 c3402c80 c00f2e88 > [Thu Jan 14 12:37:38 2016] ff40: c2f5e320 c2e8fe58 c2f5e320 c2e8fe58 20000013 c2f5e320 c2e8fe58 c00c8bc4 > [Thu Jan 14 12:37:38 2016] ff60: 00000000 c32da1c0 00000000 400c0930 00000004 00000000 c38de000 00000000 > [Thu Jan 14 12:37:38 2016] ff80: becfe538 c00d616c 00000004 00000000 016d1908 00000001 00000000 00000036 > [Thu Jan 14 12:37:38 2016] ffa0: c0012388 c00121e0 016d1908 00000001 00000004 400c0930 00000000 00000000 > [Thu Jan 14 12:37:38 2016] ffc0: 016d1908 00000001 00000000 00000036 00000001 0000000a 016d27c0 becfe538 > [Thu Jan 14 12:37:38 2016] ffe0: 00000004 becfe0c8 0001cd44 b6f157ac 60000010 00000004 00000000 00000000 > [Thu Jan 14 12:37:38 2016] [<bf23993c>] (mddev_bio_destructor+0x4/0xc [md_mod]) from [<c00f0c68>] (bio_put+0x44/0x48) > [Thu Jan 14 12:37:38 2016] [<c00f0c68>] (bio_put+0x44/0x48) from [<bf239a50>] (sync_page_io+0xc0/0xd4 [md_mod]) > [Thu Jan 14 12:37:38 2016] [<bf239a50>] (sync_page_io+0xc0/0xd4 [md_mod]) from [<bf24232c>] (read_sb_page+0xd0/0x17c [md_mod]) > [Thu Jan 14 12:37:38 2016] [<bf24232c>] (read_sb_page+0xd0/0x17c [md_mod]) from [<bf245150>] (bitmap_create+0x31c/0x6d4 [md_mod]) > [Thu Jan 14 12:37:38 2016] [<bf245150>] (bitmap_create+0x31c/0x6d4 [md_mod]) from [<bf240060>] (md_run+0x658/0x8b0 [md_mod]) > [Thu Jan 14 12:37:38 2016] [<bf240060>] (md_run+0x658/0x8b0 [md_mod]) from [<bf2402c4>] (do_md_run+0xc/0x74 [md_mod]) > [Thu Jan 14 12:37:38 2016] [<bf2402c4>] (do_md_run+0xc/0x74 [md_mod]) from [<bf241878>] (md_ioctl+0xd94/0x104c [md_mod]) > [Thu Jan 14 12:37:38 2016] [<bf241878>] (md_ioctl+0xd94/0x104c [md_mod]) from [<c015ebc0>] (__blkdev_driver_ioctl+0x1c/0x28) > [Thu Jan 14 12:37:38 2016] [<c015ebc0>] (__blkdev_driver_ioctl+0x1c/0x28) from [<c015f514>] (blkdev_ioctl+0x6ac/0x720) > [Thu Jan 14 12:37:38 2016] [<c015f514>] (blkdev_ioctl+0x6ac/0x720) from [<c00d609c>] (do_vfs_ioctl+0x504/0x588) > [Thu Jan 14 12:37:38 2016] [<c00d609c>] (do_vfs_ioctl+0x504/0x588) from [<c00d616c>] (sys_ioctl+0x4c/0x6c) > [Thu Jan 14 12:37:38 2016] [<c00d616c>] (sys_ioctl+0x4c/0x6c) from [<c00121e0>] (ret_fast_syscall+0x0/0x2c) > [Thu Jan 14 12:37:38 2016] Code: e1a00004 e8bd80f8 bf239938 e5103004 (e5931278) > [Thu Jan 14 12:37:38 2016] ---[ end trace f3c05bbfe27f5503 ]--- > > -- > With respect, > Roman
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