Messages in this thread |  | | Date | Thu, 06 Dec 2001 12:05:48 +0100 | From | Erland Lewin <> | Subject | /proc/<pid>/stat read hang with Mozilla in 2.4.14 |
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On Mon, September 3, Christian Reis wrote to linux-kernel: > Just wondering if anybody has had moz hanging on them and hanging 'ps -ax' > (which means /proc/kmem reading is hung, IIRC)? This _never_ happened > before 2.4.9, and I do mozilla QA so I'd have seen it; i've seen all sorts > of crash with it :)
On Sun, September 30, Manfred Spraul replied: > Probably you ran into the bug Ulrich Weigand found: > access_process_vm can deadlock, especially with multithreaded apps. > Access_process_vm is used by /proc/*/cmdline. > > It's fixed in 2.4.10.
I am seeing this problem (Mozilla hangs, then ps hangs (even a normal ps without args)) in kernel 2.4.14 on an SMP machine (Abit BP6 mobo). I did an strace of ps (procps 2.0.4) which ends with:
... stat64("/proc/8770", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0 open("/proc/8770/stat", O_RDONLY) = 7 read(7, >
I can't kill the 8770 process with kill -9 8770 (the /proc/8770 directory still exists). I had recompiled Mozilla while a copy was running, could this have caused the problem? I also get hangs reading the cmdline, environ, exe, maps, stat, statm and status files. I can read the fd directory, the cpu file, the root and cwd links. If I try to read the mem file, I get: "cat: /proc/8770/mem: No such process". There are no unusual messages in the system logs.
I guess I'll have to reboot now to make the dead Mozilla go away. Please CC: any replies to me, as I don't subscribe to the linux-kernel list.
Happy Hacking,
Erland - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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