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Fri, 17 Apr 2026 12:26:54 -0700 (PDT) Date: Fri, 17 Apr 2026 12:26:54 -0700 In-Reply-To: <68da879e.050a0220.1696c6.0016.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69e2897e.a00a0220.1bd0ca.0020.GAE@google.com> Subject: Forwarded: Re: [syzbot] [jfs?] KASAN: slab-use-after-free Read in lbmIODone From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com. *** Subject: Re: [syzbot] [jfs?] KASAN: slab-use-after-free Read in lbmIODone Author: tristmd@gmail.com #syz test: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.g= it master diff --git a/fs/jfs/jfs_logmgr.c b/fs/jfs/jfs_logmgr.c index XXXXXXX..XXXXXXX 100644 --- a/fs/jfs/jfs_logmgr.c +++ b/fs/jfs/jfs_logmgr.c @@ -1805,6 +1805,8 @@ static int lbmLogInit(struct jfs_log * log) */ init_waitqueue_head(&log->free_wait); =20 + atomic_set(&log->io_count, 0); + log->lbuf_free =3D NULL; =20 for (i =3D 0; i < LOGPAGES;) { @@ -1855,6 +1857,8 @@ static void lbmLogShutdown(struct jfs_log * log) =20 jfs_info("lbmLogShutdown: log:0x%p", log); =20 + wait_var_event(&log->io_count, atomic_read(&log->io_count) =3D=3D 0); + lbuf =3D log->lbuf_free; while (lbuf) { struct lbuf *next =3D lbuf->l_freelist; @@ -2128,6 +2132,7 @@ static void lbmStartIO(struct lbuf * bp) bio->bi_iter.bi_size =3D 0; lbmIODone(bio); } else { + atomic_inc(&log->io_count); submit_bio(bio); INCREMENT(lmStat.submitted); } @@ -2170,12 +2175,16 @@ static void lbmIODone(struct bio *bio) struct lbuf *nextbp, *tail; struct jfs_log *log; unsigned long flags; + int is_write; =20 /* * get back jfs buffer bound to the i/o buffer */ jfs_info("lbmIODone: bp:0x%p flag:0x%x", bp, bp->l_flag); =20 + log =3D bp->l_log; + is_write =3D !(bp->l_flag & lbmREAD); + LCACHE_LOCK(flags); /* disable+lock */ =20 if (bio->bi_status) { @@ -2214,7 +2223,6 @@ static void lbmIODone(struct bio *bio) INCREMENT(lmStat.pagedone); =20 /* update committed lsn */ - log =3D bp->l_log; log->clsn =3D (bp->l_pn << L2LOGPSIZE) + bp->l_ceor; =20 if (bp->l_flag & lbmDIRECT) { @@ -2299,6 +2307,10 @@ static void lbmIODone(struct bio *bio) out: bp->l_flag |=3D lbmDONE; LCACHE_UNLOCK(flags); + + if (is_write && !log->no_integrity) + if (atomic_dec_and_test(&log->io_count)) + wake_up_var(&log->io_count); } =20 int jfsIOWait(void *arg) diff --git a/fs/jfs/jfs_logmgr.h b/fs/jfs/jfs_logmgr.h index XXXXXXX..XXXXXXX 100644 --- a/fs/jfs/jfs_logmgr.h +++ b/fs/jfs/jfs_logmgr.h @@ -400,6 +400,8 @@ struct jfs_log { uuid_t uuid; /* 16: 128-bit uuid of log device */ =20 int no_integrity; /* 3: flag to disable journaling to disk */ + + atomic_t io_count; /* outstanding I/O count for shutdown drain */ }; =20 /*