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Message-ID: <20151214120621.GA4339@dhcp22.suse.cz> Date: Mon, 14 Dec 2015 13:06:22 +0100 From: Michal Hocko <mhocko@...nel.org> To: Linus Torvalds <torvalds@...ux-foundation.org> Cc: Andrew Morton <akpm@...ux-foundation.org>, Johannes Weiner <hannes@...xchg.org>, Hugh Dickins <hughd@...gle.com>, Daniel Vetter <daniel.vetter@...el.com>, David Airlie <airlied@...ux.ie>, Mika Westerber <mika.westerberg@...el.com>, Andrey Ryabinin <ryabinin.a.a@...il.com>, linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org> Subject: Re: !PageLocked from shmem charge path hits VM_BUG_ON with 4.4-rc4 On Mon 14-12-15 12:03:20, Michal Hocko wrote: > JFYI: Andrey Ryabinin has noticed that this might be related to > http://lkml.kernel.org/r/CAPAsAGzrOQAABhOta_o-MzocnikjPtwJLfEKQJ3n5mbBm0T7Bw@mail.gmail.com > > and indeed if somebody with pending signals would do wait_on_page_locked > then it could race AFAIU. No, a simple lock_page would fail to lock the page (thanks Andrey for the clarification in the parallel email thread). I have missed that __lock_page uses bit_wait_io and that would return EINTR when using signal_pending. The fix has changed that to singnal_pending_state so this will not happen anymore. I think the mystery is solved... -- Michal Hocko SUSE Labs -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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