From: Oleg Nesterov <oleg@redhat.com>
To: "Suzuki K. Poulose" <suzuki@in.ibm.com>
Cc: linux-kernel@vger.kernel.org,
Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>,
Christoph Hellwig <hch@lst.de>,
Masami Hiramatsu <mhiramat@redhat.com>,
Ananth N Mavinakayanahalli <ananth@in.ibm.com>,
Daisuke HATAYAMA <d.hatayama@jp.fujitsu.com>,
Andi Kleen <andi@firstfloor.org>,
Roland McGrath <roland@redhat.com>,
Amerigo Wang <amwang@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [Patch 15/21] Collect ELF Core notes data
Date: Tue, 14 Dec 2010 17:37:19 +0100 [thread overview]
Message-ID: <20101214163719.GH11400@redhat.com> (raw)
In-Reply-To: <20101214154733.495bd2e7@suzukikp>
On 12/14, Suzuki K. Poulose wrote:
>
> @@ -164,10 +197,28 @@ static int open_gencore(struct inode *in
> list_add(&cp->list, &core_list);
> mutex_unlock(&core_mutex);
>
> + max_regset = get_max_regsets(task);
> +
> + for (i = 0; i < get_nr_threads(task); i++) {
> + tinfo = kzalloc(offsetof(struct elf_thread_core_info,
> + notes[max_regset]), GFP_KERNEL);
> + if (unlikely(!tinfo)) {
> + cleanup_cp(cp);
> + ret = -ENOMEM;
> + goto out;
> + }
> + tinfo->next = cp->tinfo;
> + cp->tinfo = tinfo;
> + }
This looks strange... Obviously we can't trust get_nr_threads()
before this process is stopped/frozen.
Just noticed... release_gencore() does thaw_process() for each
thread. But, again, if it was stopped we can race with SIGCONT
and exit. IOW, -EIO is possible. Who will thaw other threads?
Also, we can probably race with exec, but I am not sure.
Oleg.
next prev parent reply other threads:[~2010-12-14 16:44 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-14 9:52 [RFC] [Patch 0/21] Non disruptive application core dump infrastructure Suzuki K. Poulose
2010-12-14 9:54 ` [Patch 1/21] Reuse freezable() predicate Suzuki K. Poulose
2010-12-14 9:57 ` [Patch 2/21] Create elfcore-common.c for ELF class independent core generation helpers Suzuki K. Poulose
2010-12-14 10:00 ` [Patch 3/21] Make vma_dump_size() generic Suzuki K. Poulose
2010-12-14 15:53 ` Oleg Nesterov
2010-12-14 10:01 ` [Patch 4/21] Make fill_psinfo generic Suzuki K. Poulose
2010-12-14 15:53 ` Oleg Nesterov
2010-12-14 15:55 ` Linus Torvalds
2010-12-15 2:22 ` Suzuki K. Poulose
2010-12-14 10:03 ` [Patch 5/21] Rename compat versions of the reusable core generation routines Suzuki K. Poulose
2010-12-14 15:57 ` Oleg Nesterov
2010-12-15 2:30 ` Suzuki K. Poulose
2010-12-14 10:04 ` [Patch 6/21] Export the reusable ELF " Suzuki K. Poulose
2010-12-14 10:05 ` [Patch 7/21] Define API for reading arch specif Program Headers for Core Suzuki K. Poulose
2010-12-14 10:08 ` [Patch 8/21] ia64 Implementation of elf_core_copy_extra_phdrs() Suzuki K. Poulose
2010-12-14 10:09 ` [Patch 9/21] UML (i386) " Suzuki K. Poulose
2010-12-14 10:11 ` [Patch 10/21] Create /proc/pid/core entry Suzuki K. Poulose
2010-12-14 10:36 ` Cong Wang
2010-12-14 15:02 ` Suzuki K. Poulose
2010-12-14 10:12 ` [Patch 11/21] Track the core generation requests Suzuki K. Poulose
2010-12-14 10:51 ` Alexey Dobriyan
2010-12-14 16:04 ` Oleg Nesterov
2010-12-14 10:13 ` [Patch 12/21] Check if the process is an ELF executable Suzuki K. Poulose
2010-12-14 16:05 ` Oleg Nesterov
2010-12-14 10:15 ` [Patch 13/21] Freeze / Thaw threads Suzuki K. Poulose
2010-12-14 16:17 ` Oleg Nesterov
2010-12-14 10:16 ` [Patch 14/21] Create ELF header Suzuki K. Poulose
2010-12-14 16:24 ` Oleg Nesterov
2010-12-14 10:17 ` [Patch 15/21] Collect ELF Core notes data Suzuki K. Poulose
2010-12-14 16:37 ` Oleg Nesterov [this message]
2010-12-14 10:19 ` [Patch 16/21] Wait for threads to freeze Suzuki K. Poulose
2010-12-14 16:42 ` Oleg Nesterov
2010-12-14 10:20 ` [Patch 17/21] Calculate the size of the core file Suzuki K. Poulose
2010-12-14 10:22 ` [Patch 18/21] Generate the data sections for ELF Core Suzuki K. Poulose
2010-12-15 7:19 ` Cong Wang
2010-12-15 12:46 ` Suzuki K. Poulose
2010-12-16 2:14 ` Cong Wang
2010-12-14 10:24 ` [Patch 19/21] Identify the ELF class of the process Suzuki K. Poulose
2010-12-14 10:26 ` [Patch 20/21] Add supporting for compat ELF class data structures Suzuki K. Poulose
2010-12-14 10:27 ` [Patch 21/21] Compat ELF class Core generation support Suzuki K. Poulose
2010-12-14 10:54 ` [RFC] [Patch 0/21] Non disruptive application core dump infrastructure Alexey Dobriyan
2010-12-14 14:59 ` Suzuki K. Poulose
2010-12-14 15:49 ` Linus Torvalds
2010-12-14 16:03 ` Tejun Heo
2010-12-14 16:19 ` Linus Torvalds
2010-12-14 16:28 ` Tejun Heo
2010-12-15 5:34 ` Suzuki K. Poulose
2010-12-15 9:37 ` Tejun Heo
2010-12-15 11:26 ` Suzuki K. Poulose
2010-12-15 11:51 ` Andi Kleen
2010-12-16 7:57 ` Suzuki K. Poulose
2010-12-15 1:04 ` KAMEZAWA Hiroyuki
2010-12-15 5:24 ` Suzuki K. Poulose
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