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a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1627276715; bh=2f2kBgXCHjekRKd0IKPmV3NbzoC23HXEiHYAkFiW1TQ=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=nJcTaW0uK1dpqbJrnSeFGRR0AetZrwnx2VRfgxCk9J3as2dNe4rsUz4QnnF+MTGtQ QkEe5Z+ECdFMQlY/dct6kVdSqrU7MAihbPK7gpnD26IhdC4gZyw8hb7kk1mQ5K073q XfruEzV968uVilZbLAYYYWuM9gxt9iJVYjImtbBc= Date: Sun, 25 Jul 2021 22:18:34 -0700 From: Andrew Morton To: syzbot Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com, Matthew Wilcox Subject: Re: [syzbot] BUG: sleeping function called from invalid context in folio_copy Message-Id: <20210725221834.35e077daff0005f3d78d08d7@linux-foundation.org> In-Reply-To: <000000000000f84cad05c7ee4778@google.com> References: <000000000000f84cad05c7ee4778@google.com> X-Mailer: Sylpheed 3.5.1 (GTK+ 2.24.32; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 28E2B7040F87 Authentication-Results: imf27.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=nJcTaW0u; spf=pass (imf27.hostedemail.com: domain of akpm@linux-foundation.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org; dmarc=none X-Stat-Signature: yn3ayzrxjk46x7c5x8rtejdq3ku5nwh1 X-HE-Tag: 1627276716-106159 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: (Cc Matthew) (It might not be a folio thing at all - I haven't checked yet) On Sun, 25 Jul 2021 01:18:27 -0700 syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: b1347210b01d Add linux-next specific files for 20210721 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=1417aeca300000 > kernel config: https://syzkaller.appspot.com/x/.config?x=86c6d14fadc3db60 > dashboard link: https://syzkaller.appspot.com/bug?extid=bb4c69145b4a52b40b27 > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1202e6ca300000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12ca875a300000 > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+bb4c69145b4a52b40b27@syzkaller.appspotmail.com > > BUG: sleeping function called from invalid context at mm/util.c:761 > in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 1660, name: kcompactd0 > 1 lock held by kcompactd0/1660: > #0: ffff8880111a4f70 (&mapping->private_lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:359 [inline] > #0: ffff8880111a4f70 (&mapping->private_lock){+.+.}-{2:2}, at: __buffer_migrate_page+0x3a8/0xa80 mm/migrate.c:722 > Preemption disabled at: > [<0000000000000000>] 0x0 > CPU: 0 PID: 1660 Comm: kcompactd0 Not tainted 5.14.0-rc2-next-20210721-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:88 [inline] > dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105 > ___might_sleep.cold+0x1f3/0x239 kernel/sched/core.c:9182 > folio_copy+0x10c/0x1a0 mm/util.c:761 > folio_migrate_copy+0x19/0x30 mm/migrate.c:619 > __buffer_migrate_page+0x820/0xa80 mm/migrate.c:757 > move_to_new_page+0x339/0xf00 mm/migrate.c:904 > __unmap_and_move mm/migrate.c:1069 [inline] > unmap_and_move mm/migrate.c:1210 [inline] > migrate_pages+0x2867/0x3890 mm/migrate.c:1487 > compact_zone+0x1abb/0x3860 mm/compaction.c:2393 > kcompactd_do_work+0x2c9/0x730 mm/compaction.c:2808 > kcompactd+0x262/0xd10 mm/compaction.c:2903 > kthread+0x3e5/0x4d0 kernel/kthread.c:319 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 > BUG: sleeping function called from invalid context at mm/util.c:761 > in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 1660, name: kcompactd0 > 1 lock held by kcompactd0/1660: > #0: ffff8880111a4f70 (&mapping->private_lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:359 [inline] > #0: ffff8880111a4f70 (&mapping->private_lock){+.+.}-{2:2}, at: __buffer_migrate_page+0x3a8/0xa80 mm/migrate.c:722 > Preemption disabled at: > [<0000000000000000>] 0x0 > CPU: 0 PID: 1660 Comm: kcompactd0 Tainted: G W 5.14.0-rc2-next-20210721-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:88 [inline] > dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105 > ___might_sleep.cold+0x1f3/0x239 kernel/sched/core.c:9182 > folio_copy+0x10c/0x1a0 mm/util.c:761 > folio_migrate_copy+0x19/0x30 mm/migrate.c:619 > __buffer_migrate_page+0x820/0xa80 mm/migrate.c:757 > move_to_new_page+0x339/0xf00 mm/migrate.c:904 > __unmap_and_move mm/migrate.c:1069 [inline] > unmap_and_move mm/migrate.c:1210 [inline] > migrate_pages+0x2867/0x3890 mm/migrate.c:1487 > compact_zone+0x1abb/0x3860 mm/compaction.c:2393 > kcompactd_do_work+0x2c9/0x730 mm/compaction.c:2808 > kcompactd+0x262/0xd10 mm/compaction.c:2903 > kthread+0x3e5/0x4d0 kernel/kthread.c:319 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 > > > --- > This report is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@googlegroups.com. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > syzbot can test patches for this issue, for details see: > https://goo.gl/tpsmEJ#testing-patches