Bug 13192
| Summary: | ENOMEM when shmat of pre-existing hugepage segment at explicit virtual address | ||
|---|---|---|---|
| Product: | Memory Management | Reporter: | starlight |
| Component: | Other | Assignee: | Andrew Morton (akpm) |
| Status: | RESOLVED DUPLICATE | ||
| Severity: | normal | CC: | alan |
| Priority: | P1 | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Kernel Version: | 2.6.29.1 | Subsystem: | |
| Regression: | Yes | Bisected commit-id: | |
Same bug as Bug 12134 except five months later I saw it from a different angle. |
$ strace -e shmget,shmat app1 shmget(0x2038272, 0, SHM_HUGETLB|0) = 196614 shmat(196614, 0, SHM_RDONLY) = ? # success $ strace -e shmget,shmat app2 shmget(0x2038282, 0, SHM_HUGETLB|0) = 0 shmat(0, 0x400000000, SHM_RDONLY) = -1 ENOMEM (Cannot allocate memory) $ ipcs -m ------ Shared Memory Segments -------- key shmid owner perms bytes nattch status 0x02038282 0 user 640 1073741824 1 0x02038281 32769 user 640 268435456 1 0x02038273 65538 user 640 2097152 2 0x02038283 98307 user 660 134217728 2 0x0203827d 131076 user 600 174063616 1 0x0203827b 163845 user 660 134217728 1 0x02038272 196614 user 640 2097152 1 0x0203827c 229383 user 600 100663296 1 0x02038252 262152 user 640 536870912 1 0x02038271 294921 user 660 2097152 0 $ cat /proc/meminfo MemTotal: 16471800 kB MemFree: 10934688 kB Buffers: 51220 kB Cached: 999912 kB SwapCached: 0 kB Active: 71580 kB Inactive: 978404 kB Active(anon): 11676 kB Inactive(anon): 0 kB Active(file): 59904 kB Inactive(file): 978404 kB Unevictable: 57632 kB Mlocked: 57632 kB SwapTotal: 2031608 kB SwapFree: 2031608 kB Dirty: 0 kB Writeback: 0 kB AnonPages: 61160 kB Mapped: 10984 kB Slab: 167472 kB SReclaimable: 46872 kB SUnreclaim: 120600 kB PageTables: 2064 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 8170356 kB Committed_AS: 92404 kB VmallocTotal: 34359738367 kB VmallocUsed: 304464 kB VmallocChunk: 34359422651 kB HugePages_Total: 2048 HugePages_Free: 890 HugePages_Rsvd: 844 HugePages_Surp: 0 Hugepagesize: 2048 kB DirectMap4k: 7872 kB DirectMap2M: 16769024 kB $ dmesg | head -3 Initializing cgroup subsys cpuset Linux version 2.6.29.1 (user@tlachtga) (gcc version 4.3.0 20080428 (Red Hat 4.3.0-8) (GCC) ) #1 SMP Sat Apr 25 22:10:06 EDT 2009 Command line: ro root=/dev/vg09/lv90 console=ttyS0,115200 hugepages=2048 Works fine under RHEL/CentOS 5.3 kernel 2.6.18-128.1.6.el5