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| ID | Category | Severity | Reproducibility | Date Submitted | Last Update | |||||||
| 0001345 | [uClibc] Shared Library Support | major | always | 05-13-07 17:40 | 10-08-08 04:28 | |||||||
| Reporter | redhatter | View Status | public | |||||||||
| Assigned To | uClibc | |||||||||||
| Priority | normal | Resolution | open | |||||||||
| Status | assigned | Product Version | 0.9.27 | |||||||||
| Summary | 0001345: [MIPS,powerpc] uClibc fails to mmap shared libraries with CONFIG_PAGE_SIZE_16KB set in kernel | |||||||||||
| Description |
Hi... Recently I started building some uClibc userland environments for a mipsel target. My build host is a Lemote Fulong miniPC running a Loongson2E processor (subset MIPS-3), and I've also been doing testing with a Cobalt Qube2 (MIPS-4). Everything builds fine, however, when I try to chroot in on the Loongson, I get told uClibc "can't map" the libraries. However, when I rsync this chroot across to the Qube2, everything works fine. It would appear that uClibc's ld.so assumes the kernel uses a page size of 4KB (0x1000). When it specifies an offset of 0x3000, this works fine on a kernel with a 4KB page size, since 3 |
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| Additional Information |
An strace reveals what's happening behind the scenes: execve("bin/busybox.dynamic", ["bin/busybox.dynamic"], [/* 57 vars */]) = 0 svr4_syscall() = -1 ERRNO_4090 (Unknown error 4090) stat("/etc/ld.so.cache", {st_mode=S_IFREG|0644, st_size=1728, ...}) = 0 open("/etc/ld.so.cache", O_RDONLY) = 3 old_mmap(NULL, 1728, PROT_READ, MAP_SHARED, 3, 0) = 0x2aab4000 close(3) = 0 open("/lib/libcrypt.so.0", O_RDONLY) = 3 old_mmap(NULL, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2aab8000 read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\10\0\1\0\0\0`\5\0\000"..., 16384) = 13584 old_mmap(NULL, 348160, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2aaf0000 old_mmap(0x2aaf0000, 10692, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 3, 0) = 0x2aaf0000 old_mmap(0x2ab33000, 68, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x3000) = -1 EINVAL (Invalid argument) old_mmap(NULL, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2aabc000 write(2, "", 0) = 0 write(2, "bin/busybox.dynamic", 19) = 19 write(2, ": can\'t map \'", 13) = 13 write(2, "/lib/libcrypt.so.0", 18) = 18 write(2, "\'\n", 2) = 2 munmap(0x2aabc000, 16384) = 0 munmap(0x2aaf0000, 348160) = 0 close(3) = 0 The Loongson's kernel was compiled with a page size of 16KB, whereas the Qube2 uses 4KB. Presently, I'm recompiling my kernel with 4KB pages to see if this fixes the problem. At minimum though, people should be made aware of this limitation in uClibc. |
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Notes |
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(0002354) redhatter 05-13-07 17:42 |
Whoops, this was _meant_ for the uClibc project, not buildroot. Can this be reassigned please? |
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(0002355) bernhardf 05-14-07 00:44 |
reassigning upon request. If this report is really about 0.9.27, then i suggest you retry with 0.9.29 or trunk and follow up. |
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(0002356) redhatter 05-14-07 04:36 |
It's about 0.9.28, I'm yet to try 0.9.29 (I've been using the ebuilds in the Gentoo portage tree). I've also just discovered that the Loongson machines won't run with a page size of 4KB, they require a 16KB page size, thus the linker will need to be fixed. I notice in ldso/ldso/mips/dl-sysdep.h, the following #defines are present: /* 4096 bytes alignment */ #define PAGE_ALIGN 0xfffff000 #define ADDR_ALIGN 0xfff #define OFFS_ALIGN 0x7ffff000 I presume these are what need to be tweaked? Has this part changed wildly since 0.9.28? |
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(0003584) falek 01-29-08 15:15 |
The buildroot-20080125 kit, which has uClibc 0.9.29, gives the same error with our 64K Linux kernel. So it looks like the problem is still with us in 0.9.29. RAMDISK: Loading 3960KiB [1 disk] into ram disk... done. VFS: Mounted root (ext2 filesystem) readonly. Freeing unused kernel memory: 384k freed /sbin/initKernel panic - not syncing: Attempted to kill init! :500: can't map Rebooting in 180 seconds..'/lib/libcrypt.so.0' /sbin/init:500: can't map '/lib/libcrypt.so.0' /sbin/init:500: can't map '/lib/libcrypt.so.0' /sbin/init: can't load library 'libcrypt.so.0' |
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Issue History |
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| Date Modified | Username | Field | Change |
| 05-13-07 17:40 | redhatter | New Issue | |
| 05-13-07 17:40 | redhatter | Status | new => assigned |
| 05-13-07 17:40 | redhatter | Assigned To | => buildroot |
| 05-13-07 17:42 | redhatter | Note Added: 0002354 | |
| 05-14-07 00:15 | jacmet | Project | buildroot => uClibc |
| 05-14-07 00:44 | bernhardf | Note Added: 0002355 | |
| 05-14-07 00:44 | bernhardf | Assigned To | buildroot => uClibc |
| 05-14-07 04:36 | redhatter | Note Added: 0002356 | |
| 12-19-07 13:19 | alonbl | Issue Monitored: alonbl | |
| 01-29-08 15:15 | falek | Note Added: 0003584 | |
| 01-29-08 15:23 | falek | Issue Monitored: falek | |
| 10-08-08 04:25 | bernhardf | Summary | uClibc fails to mmap shared libraries with CONFIG_PAGE_SIZE_16KB set in kernel => [MIPS] uClibc fails to mmap shared libraries with CONFIG_PAGE_SIZE_16KB set in kernel |
| 10-08-08 04:28 | bernhardf | Category | Architecture Specific => Shared Library Support |
| 10-08-08 04:28 | bernhardf | Summary | [MIPS] uClibc fails to mmap shared libraries with CONFIG_PAGE_SIZE_16KB set in kernel => [MIPS,powerpc] uClibc fails to mmap shared libraries with CONFIG_PAGE_SIZE_16KB set in kernel |
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