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protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000df44fd05e52ffdee" ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1659369170; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=jNZ4qee3GVsFw6/F/FUks4jYQAy902vrYOjQFFDWXtI=; b=Cct9tzbvVFYhxZH3y2PhIlaOtrlzbz0afNtX/81AyQpsp+EHZ53r8LVwjyvL8s9k6jBvGr T1Rtt0X+8G9hdzy2ScLU1XawRfwHoyyEpE3zOEUq6bTQ/lMiOeuEuMktpKgcZWsuWikgt5 vXxshWYAiCZTj3RaOGv8pps0E+1hmSI= ARC-Authentication-Results: i=1; imf14.hostedemail.com; dkim=pass header.d=google.com header.s=20210112 header.b=eVbYP0Tv; spf=pass (imf14.hostedemail.com: domain of khazhy@google.com designates 209.85.214.180 as permitted sender) smtp.mailfrom=khazhy@google.com; dmarc=pass (policy=reject) header.from=google.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1659369170; a=rsa-sha256; cv=none; b=Q25pj/MYef2q8OAwUInCUXAHVGcMn3/Tbkm8WsCMFxwGn0XsT1X3Nka2VP34UpiwxPyWEv wKPOTBw+XSfIWbf2pqjoG0w7grWAVLsHG/JOejMX1qbWkK2Hk8vdM0bik4uY74FbArKfs8 b+ayzgbSNt58tb4ck1fLMZIxk5ABxLo= Authentication-Results: imf14.hostedemail.com; dkim=pass header.d=google.com header.s=20210112 header.b=eVbYP0Tv; spf=pass (imf14.hostedemail.com: domain of khazhy@google.com designates 209.85.214.180 as permitted sender) smtp.mailfrom=khazhy@google.com; dmarc=pass (policy=reject) header.from=google.com X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: D3A501000F9 X-Stat-Signature: 6iehupw3mnoo5zpjskuxemkrhf4w5d5u X-HE-Tag: 1659369169-87935 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: --000000000000df44fd05e52ffdee Content-Type: text/plain; charset="UTF-8" On Fri, Jul 29, 2022 at 6:29 PM Jan Kara wrote: > > On Fri 29-07-22 14:51:23, Khazhismel Kumykov wrote: > > This fixes a KASAN splat in timer interrupt after removing a device > > > > Move wb->work_lock to be irq-safe, as complete may be called from irq > > > > Fixes: 45a2966fd641 ("writeback: fix bandwidth estimate for spiky workload") > > Signed-off-by: Khazhismel Kumykov > > The patch looks good but I wish there are more details in the changelog > because with this terse changelog I can only guess. I suppose something > like: Thanks for the comments, I sent an updated changelog. I hope you don't mind me using your wording :) And I'll take note to not be shy in messages for the future! > > writeback: avoid use after free after removing a device > > When a disk is removed, bdi_unregister() gets called to stop any further > writeback and wait for the running one to complete. However while IO > completes, wb_inode_writeback_end() will schedule another delayed writeback > and by the time timer fires the bdi_writeback structure may be already > freed. Fix the problem by checking whether bdi is still alive before > scheduling new work in wb_inode_writeback_end(). Since this requires > wb->work_lock and wb_inode_writeback_end() may get called from an > interrupt, switch wb->work_lock to an irqsafe lock. > > Honza > > > --- > > fs/fs-writeback.c | 12 ++++++------ > > mm/backing-dev.c | 10 +++++----- > > mm/page-writeback.c | 6 +++++- > > 3 files changed, 16 insertions(+), 12 deletions(-) > > > > diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c > > index 05221366a16d..08a1993ab7fd 100644 > > --- a/fs/fs-writeback.c > > +++ b/fs/fs-writeback.c > > @@ -134,10 +134,10 @@ static bool inode_io_list_move_locked(struct inode *inode, > > > > static void wb_wakeup(struct bdi_writeback *wb) > > { > > - spin_lock_bh(&wb->work_lock); > > + spin_lock_irq(&wb->work_lock); > > if (test_bit(WB_registered, &wb->state)) > > mod_delayed_work(bdi_wq, &wb->dwork, 0); > > - spin_unlock_bh(&wb->work_lock); > > + spin_unlock_irq(&wb->work_lock); > > } > > > > static void finish_writeback_work(struct bdi_writeback *wb, > > @@ -164,7 +164,7 @@ static void wb_queue_work(struct bdi_writeback *wb, > > if (work->done) > > atomic_inc(&work->done->cnt); > > > > - spin_lock_bh(&wb->work_lock); > > + spin_lock_irq(&wb->work_lock); > > > > if (test_bit(WB_registered, &wb->state)) { > > list_add_tail(&work->list, &wb->work_list); > > @@ -172,7 +172,7 @@ static void wb_queue_work(struct bdi_writeback *wb, > > } else > > finish_writeback_work(wb, work); > > > > - spin_unlock_bh(&wb->work_lock); > > + spin_unlock_irq(&wb->work_lock); > > } > > > > /** > > @@ -2082,13 +2082,13 @@ static struct wb_writeback_work *get_next_work_item(struct bdi_writeback *wb) > > { > > struct wb_writeback_work *work = NULL; > > > > - spin_lock_bh(&wb->work_lock); > > + spin_lock_irq(&wb->work_lock); > > if (!list_empty(&wb->work_list)) { > > work = list_entry(wb->work_list.next, > > struct wb_writeback_work, list); > > list_del_init(&work->list); > > } > > - spin_unlock_bh(&wb->work_lock); > > + spin_unlock_irq(&wb->work_lock); > > return work; > > } > > > > diff --git a/mm/backing-dev.c b/mm/backing-dev.c > > index 95550b8fa7fe..de65cb1e5f76 100644 > > --- a/mm/backing-dev.c > > +++ b/mm/backing-dev.c > > @@ -260,10 +260,10 @@ void wb_wakeup_delayed(struct bdi_writeback *wb) > > unsigned long timeout; > > > > timeout = msecs_to_jiffies(dirty_writeback_interval * 10); > > - spin_lock_bh(&wb->work_lock); > > + spin_lock_irq(&wb->work_lock); > > if (test_bit(WB_registered, &wb->state)) > > queue_delayed_work(bdi_wq, &wb->dwork, timeout); > > - spin_unlock_bh(&wb->work_lock); > > + spin_unlock_irq(&wb->work_lock); > > } > > > > static void wb_update_bandwidth_workfn(struct work_struct *work) > > @@ -334,12 +334,12 @@ static void cgwb_remove_from_bdi_list(struct bdi_writeback *wb); > > static void wb_shutdown(struct bdi_writeback *wb) > > { > > /* Make sure nobody queues further work */ > > - spin_lock_bh(&wb->work_lock); > > + spin_lock_irq(&wb->work_lock); > > if (!test_and_clear_bit(WB_registered, &wb->state)) { > > - spin_unlock_bh(&wb->work_lock); > > + spin_unlock_irq(&wb->work_lock); > > return; > > } > > - spin_unlock_bh(&wb->work_lock); > > + spin_unlock_irq(&wb->work_lock); > > > > cgwb_remove_from_bdi_list(wb); > > /* > > diff --git a/mm/page-writeback.c b/mm/page-writeback.c > > index 55c2776ae699..3c34db15cf70 100644 > > --- a/mm/page-writeback.c > > +++ b/mm/page-writeback.c > > @@ -2867,6 +2867,7 @@ static void wb_inode_writeback_start(struct bdi_writeback *wb) > > > > static void wb_inode_writeback_end(struct bdi_writeback *wb) > > { > > + unsigned long flags; > > atomic_dec(&wb->writeback_inodes); > > /* > > * Make sure estimate of writeback throughput gets updated after > > @@ -2875,7 +2876,10 @@ static void wb_inode_writeback_end(struct bdi_writeback *wb) > > * that if multiple inodes end writeback at a similar time, they get > > * batched into one bandwidth update. > > */ > > - queue_delayed_work(bdi_wq, &wb->bw_dwork, BANDWIDTH_INTERVAL); > > + spin_lock_irqsave(&wb->work_lock, flags); > > + if (test_bit(WB_registered, &wb->state)) > > + queue_delayed_work(bdi_wq, &wb->bw_dwork, BANDWIDTH_INTERVAL); > > + spin_unlock_irqrestore(&wb->work_lock, flags); > > } > > > > bool __folio_end_writeback(struct folio *folio) > > -- > > 2.37.1.455.g008518b4e5-goog > > > -- > Jan Kara > SUSE Labs, CR --000000000000df44fd05e52ffdee Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIPmwYJKoZIhvcNAQcCoIIPjDCCD4gCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg ggz1MIIEtjCCA56gAwIBAgIQeAMYYHb81ngUVR0WyMTzqzANBgkqhkiG9w0BAQsFADBMMSAwHgYD VQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSMzETMBEGA1UEChMKR2xvYmFsU2lnbjETMBEGA1UE AxMKR2xvYmFsU2lnbjAeFw0yMDA3MjgwMDAwMDBaFw0yOTAzMTgwMDAwMDBaMFQxCzAJBgNVBAYT AkJFMRkwFwYDVQQKExBHbG9iYWxTaWduIG52LXNhMSowKAYDVQQDEyFHbG9iYWxTaWduIEF0bGFz IFIzIFNNSU1FIENBIDIwMjAwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQCvLe9xPU9W 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