Correct behaviour of ubiattach / ubiformat in the face of ECC errors?
Iwo Mergler
Iwo.Mergler at netcommwireless.com
Wed Jun 18 20:15:11 PDT 2014
Hi all,
I'm debugging a NAND driver and I'm unsure about what the correct behaviour
of ubiformat / ubiattach ought to be in the face of uncorrectable ECC errors.
This is a 2.6.35 kernel, with UBI/UBIFS updated to the top of
git://git.infradead.org/~dedekind/ubifs-v2.6.35.git and mtd-utils v1.5.1.
My question is, what is ubiattach / ubiformat supposed to do if a non-correctable
ECC error occurs in a block during the scan?
My gut feeling says that ubiattach should fail if the PEB was in use, but ubiformat
should mark the PEB as bad and continue.
This is not the behaviour I'm observing. The broken PEB in the examples below
contains a EC header, but no VID header - it's not in use.
To complicate matters, I'm also unsure about the correct return value from the
NAND driver in this situation. Depending on which documentation I read, it should
now return -1, -EIO or -EBADMSG.
So I tried all of them.
Ubiformat. fails for -EPERM & -EIO, enters infinite read loop for -EBADMSG:
[ 14.800000] SWECC(1) - MBE detected ([5ff00]-0000/0)
[ 14.810000] [T49]bovine_nand_read_page_hwecc:671: Returned -1 [-EPERM], page=0x5ff00
libmtd: error!: cannot read 64 bytes from mtd6 (eraseblock 13796, offset 0)
error 1 (Operation not permitted)
ubiformat: error!: failed to scan mtd6 (/dev/mtd6)
[ 14.840000] [T49]bovine_nand_read_page_hwecc:671: Returned -5 [-EIO], page=0x5ff00
libmtd: error!: cannot read 64 bytes from mtd6 (eraseblock 13796, offset 0)
error 5 (Input/output error)
ubiformat: error!: failed to scan mtd6 (/dev/mtd6)
[ 27.040000] HWECC(1) - MBE detected ([5ff00]-0000)
[ 27.040000] SWECC(1) - MBE detected ([5ff00]-0000/0)
[ 27.050000] [T4a]bovine_nand_read_page_hwecc:671: Returned -74 [-EBADMSG], page=0x5ff00
[ 27.060000] HWECC(1) - MBE detected ([5ff00]-0000)
[ 27.060000] SWECC(1) - MBE detected ([5ff00]-0000/0)
[ 27.070000] [T4a]bovine_nand_read_page_hwecc:671: Returned -74 [-EBADMSG], page=0x5ff00
[ 27.080000] HWECC(1) - MBE detected ([5ff00]-0000)
[ 27.080000] SWECC(1) - MBE detected ([5ff00]-0000/0)
[ 27.090000] [T4a]bovine_nand_read_page_hwecc:671: Returned -74 [-EBADMSG], page=0x5ff00
[ 27.090000] HWECC(1) - MBE detected ([5ff00]-0000)
[ 27.100000] SWECC(1) - MBE detected ([5ff00]-0000/0)
[ 27.100000] [T4a]bovine_nand_read_page_hwecc:671: Returned -74 [-EBADMSG], page=0x5ff00
[ 27.110000] HWECC(1) - MBE detected ([5ff00]-0000)
[ 27.120000] SWECC(1) - MBE detected ([5ff00]-0000/0)
... Goes on forever.
Ubiattach. This fails in all cases, although the error is significantly different when -EBADMSG
is returned:
[ 19.910000] HWECC(1) - MBE detected ([5ff00]-0000)
[ 19.920000] SWECC(1) - MBE detected ([5ff00]-0000/0)
[ 19.920000] [T84]bovine_nand_read_page_hwecc:671: Returned -1 [-EPERM], page=0x5ff00
[ 19.930000] UBI warning: ubi_io_read: error -1 while reading 64 bytes from PEB 13796:0, read only 0 bytes, retry
[ 19.940000] HWECC(1) - MBE detected ([5ff00]-0000)
[ 19.950000] SWECC(1) - MBE detected ([5ff00]-0000/0)
[ 19.950000] [T84]bovine_nand_read_page_hwecc:671: Returned -1 [-EPERM], page=0x5ff00
[ 19.960000] UBI warning: ubi_io_read: error -1 while reading 64 bytes from PEB 13796:0, read only 0 bytes, retry
[ 19.970000] HWECC(1) - MBE detected ([5ff00]-0000)
[ 19.970000] SWECC(1) - MBE detected ([5ff00]-0000/0)
[ 19.980000] [T84]bovine_nand_read_page_hwecc:671: Returned -1 [-EPERM], page=0x5ff00
[ 19.990000] UBI warning: ubi_io_read: error -1 while reading 64 bytes from PEB 13796:0, read only 0 bytes, retry
[ 20.000000] HWECC(1) - MBE detected ([5ff00]-0000)
[ 20.000000] SWECC(1) - MBE detected ([5ff00]-0000/0)
[ 20.010000] [T84]bovine_nand_read_page_hwecc:671: Returned -1 [-EPERM], page=0x5ff00
[ 20.020000] UBI error: ubi_io_read: error -1 while reading 64 bytes from PEB 13796:0, read 0 bytes
[ 20.020000] [<c002a420>] (unwind_backtrace+0x0/0xec) from [<c01e23a0>] (ubi_io_read+0x1dc/0x2a4)
[ 20.030000] [<c01e23a0>] (ubi_io_read+0x1dc/0x2a4) from [<c01e2814>] (ubi_io_read_ec_hdr+0x68/0x214)
[ 20.040000] [<c01e2814>] (ubi_io_read_ec_hdr+0x68/0x214) from [<c01e6d30>] (scan_peb+0x54/0x5e8)
[ 20.050000] [<c01e6d30>] (scan_peb+0x54/0x5e8) from [<c01e73a8>] (scan_all+0xe4/0x2f8)
[ 20.060000] [<c01e73a8>] (scan_all+0xe4/0x2f8) from [<c01e75c8>] (ubi_attach+0xc/0xbc)
[ 20.070000] [<c01e75c8>] (ubi_attach+0xc/0xbc) from [<c01dcabc>] (ubi_attach_mtd_dev+0x1e4/0x570)
[ 20.080000] [<c01dcabc>] (ubi_attach_mtd_dev+0x1e4/0x570) from [<c01dcfb8>] (ctrl_cdev_ioctl+0xd0/0x160)
[ 20.090000] [<c01dcfb8>] (ctrl_cdev_ioctl+0xd0/0x160) from [<c0095898>] (vfs_ioctl+0x2c/0x70)
[ 20.090000] [<c0095898>] (vfs_ioctl+0x2c/0x70) from [<c0095fa4>] (do_vfs_ioctl+0x300/0x32c)
[ 20.100000] [<c0095fa4>] (do_vfs_ioctl+0x300/0x32c) from [<c0096008>] (sys_ioctl+0x38/0x5c)
[ 20.110000] [<c0096008>] (sys_ioctl+0x38/0x5c) from [<c0024e80>] (ret_fast_syscall+0x0/0x2c)
[ 20.120000] UBI error: ubi_attach_mtd_dev: failed to attach mtd6, error -1
ubiattach: error!: cannot attach mtd6
error 1 (Operation not permitted)
ubimount: [ubiattach /dev/ubi_ctrl -m 6 -d 11 -O 4096]->255
[ 19.940000] HWECC(1) - MBE detected ([5ff00]-0000)
[ 19.940000] SWECC(1) - MBE detected ([5ff00]-0000/0)
[ 19.950000] [T01]bovine_nand_read_page_hwecc:671: Returned -5 [-EIO], page=0x5ff00
[ 19.960000] UBI warning: ubi_io_read: error -5 while reading 64 bytes from PEB 13796:0, read only 0 bytes, retry
[ 19.970000] HWECC(1) - MBE detected ([5ff00]-0000)
[ 19.970000] SWECC(1) - MBE detected ([5ff00]-0000/0)
[ 19.980000] [T01]bovine_nand_read_page_hwecc:671: Returned -5 [-EIO], page=0x5ff00
[ 19.980000] UBI warning: ubi_io_read: error -5 while reading 64 bytes from PEB 13796:0, read only 0 bytes, retry
[ 19.990000] HWECC(1) - MBE detected ([5ff00]-0000)
[ 20.000000] SWECC(1) - MBE detected ([5ff00]-0000/0)
[ 20.000000] [T01]bovine_nand_read_page_hwecc:671: Returned -5 [-EIO], page=0x5ff00
[ 20.010000] UBI warning: ubi_io_read: error -5 while reading 64 bytes from PEB 13796:0, read only 0 bytes, retry
[ 20.020000] HWECC(1) - MBE detected ([5ff00]-0000)
[ 20.030000] SWECC(1) - MBE detected ([5ff00]-0000/0)
[ 20.030000] [T01]bovine_nand_read_page_hwecc:671: Returned -5 [-EIO], page=0x5ff00
[ 20.040000] UBI error: ubi_io_read: error -5 while reading 64 bytes from PEB 13796:0, read 0 bytes
[ 20.050000] [<c002a420>] (unwind_backtrace+0x0/0xec) from [<c01e2374>] (ubi_io_read+0x1dc/0x2a4)
[ 20.060000] [<c01e2374>] (ubi_io_read+0x1dc/0x2a4) from [<c01e27e8>] (ubi_io_read_ec_hdr+0x68/0x214)
[ 20.070000] [<c01e27e8>] (ubi_io_read_ec_hdr+0x68/0x214) from [<c01e6d04>] (scan_peb+0x54/0x5e8)
[ 20.070000] [<c01e6d04>] (scan_peb+0x54/0x5e8) from [<c01e737c>] (scan_all+0xe4/0x2f8)
[ 20.080000] [<c01e737c>] (scan_all+0xe4/0x2f8) from [<c01e759c>] (ubi_attach+0xc/0xbc)
[ 20.090000] [<c01e759c>] (ubi_attach+0xc/0xbc) from [<c01dca90>] (ubi_attach_mtd_dev+0x1e4/0x570)
[ 20.100000] [<c01dca90>] (ubi_attach_mtd_dev+0x1e4/0x570) from [<c01dcf8c>] (ctrl_cdev_ioctl+0xd0/0x160)
[ 20.110000] [<c01dcf8c>] (ctrl_cdev_ioctl+0xd0/0x160) from [<c0095898>] (vfs_ioctl+0x2c/0x70)
[ 20.120000] [<c0095898>] (vfs_ioctl+0x2c/0x70) from [<c0095fa4>] (do_vfs_ioctl+0x300/0x32c)
[ 20.130000] [<c0095fa4>] (do_vfs_ioctl+0x300/0x32c) from [<c0096008>] (sys_ioctl+0x38/0x5c)
[ 20.130000] [<c0096008>] (sys_ioctl+0x38/0x5c) from [<c0024e80>] (ret_fast_syscall+0x0/0x2c)
[ 20.150000] UBI error: ubi_attach_mtd_dev: failed to attach mtd6, error -5
ubiattach: error!: cannot attach mtd6
error 5 (Input/output error)
ubimount: [ubiattach /dev/ubi_ctrl -m 6 -d 11 -O 4096]->255
[ 20.080000] HWECC(1) - MBE detected ([5ff00]-0000)
[ 20.080000] SWECC(1) - MBE detected ([5ff00]-0000/0)
[ 20.090000] [T88]bovine_nand_read_page_hwecc:671: Returned -74 [-EBADMSG], page=0x5ff00
[ 20.090000] UBI warning: ubi_io_read: error -74 (ECC error) while reading 64 bytes from PEB 13796:0, read only 0 bytes, retry
[ 20.110000] HWECC(1) - MBE detected ([5ff00]-0000)
[ 20.110000] SWECC(1) - MBE detected ([5ff00]-0000/0)
[ 20.120000] [T88]bovine_nand_read_page_hwecc:671: Returned -74 [-EBADMSG], page=0x5ff00
[ 20.120000] UBI warning: ubi_io_read: error -74 (ECC error) while reading 64 bytes from PEB 13796:0, read only 0 bytes, retry
[ 20.140000] HWECC(1) - MBE detected ([5ff00]-0000)
[ 20.140000] SWECC(1) - MBE detected ([5ff00]-0000/0)
[ 20.150000] [T88]bovine_nand_read_page_hwecc:671: Returned -74 [-EBADMSG], page=0x5ff00
[ 20.150000] UBI warning: ubi_io_read: error -74 (ECC error) while reading 64 bytes from PEB 13796:0, read only 0 bytes, retry
[ 20.170000] HWECC(1) - MBE detected ([5ff00]-0000)
[ 20.170000] SWECC(1) - MBE detected ([5ff00]-0000/0)
[ 20.180000] [T88]bovine_nand_read_page_hwecc:671: Returned -74 [-EBADMSG], page=0x5ff00
[ 20.180000] UBI error: ubi_io_read: error -74 (ECC error) while reading 64 bytes from PEB 13796:0, read 0 bytes
[ 20.190000] [<c002a420>] (unwind_backtrace+0x0/0xec) from [<c01e23a0>] (ubi_io_read+0x1dc/0x2a4)
[ 20.200000] [<c01e23a0>] (ubi_io_read+0x1dc/0x2a4) from [<c01e2814>] (ubi_io_read_ec_hdr+0x68/0x214)
[ 20.210000] [<c01e2814>] (ubi_io_read_ec_hdr+0x68/0x214) from [<c01e6d30>] (scan_peb+0x54/0x5e8)
[ 20.220000] [<c01e6d30>] (scan_peb+0x54/0x5e8) from [<c01e73a8>] (scan_all+0xe4/0x2f8)
[ 20.230000] [<c01e73a8>] (scan_all+0xe4/0x2f8) from [<c01e75c8>] (ubi_attach+0xc/0xbc)
[ 20.240000] [<c01e75c8>] (ubi_attach+0xc/0xbc) from [<c01dcabc>] (ubi_attach_mtd_dev+0x1e4/0x570)
[ 20.240000] [<c01dcabc>] (ubi_attach_mtd_dev+0x1e4/0x570) from [<c01dcfb8>] (ctrl_cdev_ioctl+0xd0/0x160)
[ 20.250000] [<c01dcfb8>] (ctrl_cdev_ioctl+0xd0/0x160) from [<c0095898>] (vfs_ioctl+0x2c/0x70)
[ 20.260000] [<c0095898>] (vfs_ioctl+0x2c/0x70) from [<c0095fa4>] (do_vfs_ioctl+0x300/0x32c)
[ 20.270000] [<c0095fa4>] (do_vfs_ioctl+0x300/0x32c) from [<c0096008>] (sys_ioctl+0x38/0x5c)
[ 20.280000] [<c0096008>] (sys_ioctl+0x38/0x5c) from [<c0024e80>] (ret_fast_syscall+0x0/0x2c)
[ 20.290000] UBI assert failed in ubi_io_read at 203 (pid 197)
[ 20.290000] [<c002a420>] (unwind_backtrace+0x0/0xec) from [<c01e23e4>] (ubi_io_read+0x220/0x2a4)
[ 20.300000] [<c01e23e4>] (ubi_io_read+0x220/0x2a4) from [<c01e2814>] (ubi_io_read_ec_hdr+0x68/0x214)
[ 20.310000] [<c01e2814>] (ubi_io_read_ec_hdr+0x68/0x214) from [<c01e6d30>] (scan_peb+0x54/0x5e8)
[ 20.320000] [<c01e6d30>] (scan_peb+0x54/0x5e8) from [<c01e73a8>] (scan_all+0xe4/0x2f8)
[ 20.330000] [<c01e73a8>] (scan_all+0xe4/0x2f8) from [<c01e75c8>] (ubi_attach+0xc/0xbc)
[ 20.340000] [<c01e75c8>] (ubi_attach+0xc/0xbc) from [<c01dcabc>] (ubi_attach_mtd_dev+0x1e4/0x570)
[ 20.340000] [<c01dcabc>] (ubi_attach_mtd_dev+0x1e4/0x570) from [<c01dcfb8>] (ctrl_cdev_ioctl+0xd0/0x160)
[ 20.350000] [<c01dcfb8>] (ctrl_cdev_ioctl+0xd0/0x160) from [<c0095898>] (vfs_ioctl+0x2c/0x70)
[ 20.360000] [<c0095898>] (vfs_ioctl+0x2c/0x70) from [<c0095fa4>] (do_vfs_ioctl+0x300/0x32c)
[ 20.370000] [<c0095fa4>] (do_vfs_ioctl+0x300/0x32c) from [<c0096008>] (sys_ioctl+0x38/0x5c)
[ 20.380000] [<c0096008>] (sys_ioctl+0x38/0x5c) from [<c0024e80>] (ret_fast_syscall+0x0/0x2c)
[ 20.390000] UBI error: ubi_attach_mtd_dev: failed to attach mtd6, error -5
ubiattach: error!: cannot attach mtd6
error 5 (Input/output error)
ubimount: [ubiattach /dev/ubi_ctrl -m 6 -d 11 -O 4096]->255
Best reagrds,
Iwo
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