From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-it0-f71.google.com (mail-it0-f71.google.com [209.85.214.71]) by kanga.kvack.org (Postfix) with ESMTP id 3899B6B0007 for ; Sun, 5 Aug 2018 04:14:04 -0400 (EDT) Received: by mail-it0-f71.google.com with SMTP id a10-v6so9630847itc.9 for ; Sun, 05 Aug 2018 01:14:04 -0700 (PDT) Received: from mail-sor-f69.google.com (mail-sor-f69.google.com. [209.85.220.69]) by mx.google.com with SMTPS id k128-v6sor1421847itg.91.2018.08.05.01.14.02 for (Google Transport Security); Sun, 05 Aug 2018 01:14:02 -0700 (PDT) MIME-Version: 1.0 Date: Sun, 05 Aug 2018 01:14:02 -0700 In-Reply-To: <0000000000005e979605729c1564@google.com> Message-ID: <00000000000059e4fd0572abbe4a@google.com> Subject: Re: WARNING in try_charge From: syzbot Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: owner-linux-mm@kvack.org List-ID: To: cgroups@vger.kernel.org, hannes@cmpxchg.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mhocko@kernel.org, penguin-kernel@I-love.SAKURA.ne.jp, rientjes@google.com, syzkaller-bugs@googlegroups.com, vdavydov.dev@gmail.com syzbot has found a reproducer for the following crash on: HEAD commit: 116b181bb646 Add linux-next specific files for 20180803 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=15f87bfc400000 kernel config: https://syzkaller.appspot.com/x/.config?x=b4f38be7c2c519d5 dashboard link: https://syzkaller.appspot.com/bug?extid=bab151e82a4e973fa325 compiler: gcc (GCC) 8.0.1 20180413 (experimental) syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=10e553e0400000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+bab151e82a4e973fa325@syzkaller.appspotmail.com Killed process 6527 (syz-executor2) total-vm:37704kB, anon-rss:2140kB, file-rss:0kB, shmem-rss:0kB oom_reaper: reaped process 6527 (syz-executor2), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB ------------[ cut here ]------------ oom_reaper: reaped process 6532 (syz-executor3), now anon-rss:0kB, file-rss:4kB, shmem-rss:0kB Memory cgroup charge failed because of no reclaimable memory! This looks like a misconfiguration or a kernel bug. WARNING: CPU: 1 PID: 6536 at mm/memcontrol.c:1705 mem_cgroup_oom mm/memcontrol.c:1704 [inline] WARNING: CPU: 1 PID: 6536 at mm/memcontrol.c:1705 try_charge+0x734/0x1680 mm/memcontrol.c:2262 oom_reaper: reaped process 6518 (syz-executor0), now anon-rss:0kB, file-rss:4kB, shmem-rss:0kB Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 6536 Comm: syz-executor2 Not tainted 4.18.0-rc7-next-20180803+ #31 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 panic+0x238/0x4e7 kernel/panic.c:184 __warn.cold.8+0x163/0x1ba kernel/panic.c:536 report_bug+0x252/0x2d0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] do_error_trap+0x1fc/0x4d0 arch/x86/kernel/traps.c:296 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:996 RIP: 0010:mem_cgroup_oom mm/memcontrol.c:1704 [inline] RIP: 0010:try_charge+0x734/0x1680 mm/memcontrol.c:2262 Code: 85 b8 04 00 00 8b b5 c8 fd ff ff 44 89 f2 4c 89 ff e8 f0 51 ff ff 84 c0 0f 85 31 08 00 00 48 c7 c7 60 17 13 87 e8 7c fe 85 ff <0f> 0b 48 8d 95 f8 fd ff ff 48 8b b5 c0 fd ff ff 48 b8 00 00 00 00 RSP: 0018:ffff8801a8637620 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffff8801cbb5c980 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff816366f1 RDI: ffff8801a8637310 RBP: ffff8801a86378b0 R08: ffff8801b23001c0 R09: fffffbfff0ff11fc R10: fffffbfff0ff11fc R11: ffffffff87f88fe3 R12: dffffc0000000000 R13: ffff8801a8637888 R14: 0000000000000000 R15: ffff8801cbb5c980 memcg_kmem_charge_memcg+0x7c/0x120 mm/memcontrol.c:2592 memcg_charge_slab mm/slab.h:283 [inline] kmem_getpages mm/slab.c:1415 [inline] cache_grow_begin+0x207/0x710 mm/slab.c:2677 fallback_alloc+0x203/0x2c0 mm/slab.c:3219 ____cache_alloc_node+0x1c7/0x1e0 mm/slab.c:3287 __do_cache_alloc mm/slab.c:3356 [inline] slab_alloc mm/slab.c:3384 [inline] kmem_cache_alloc+0x1e5/0x760 mm/slab.c:3552 shmem_alloc_inode+0x1b/0x40 mm/shmem.c:3515 alloc_inode+0x63/0x190 fs/inode.c:210 new_inode_pseudo+0x71/0x1a0 fs/inode.c:903 new_inode+0x1c/0x40 fs/inode.c:932 shmem_get_inode+0xf1/0x910 mm/shmem.c:2142 __shmem_file_setup.part.48+0x83/0x2a0 mm/shmem.c:3871 __shmem_file_setup mm/shmem.c:3865 [inline] shmem_file_setup+0x65/0x90 mm/shmem.c:3912 __do_sys_memfd_create mm/memfd.c:304 [inline] __se_sys_memfd_create mm/memfd.c:247 [inline] __x64_sys_memfd_create+0x2af/0x4f0 mm/memfd.c:247 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x456b29 Code: Bad RIP value. RSP: 002b:00007f91f0f04a88 EFLAGS: 00000246 ORIG_RAX: 000000000000013f RAX: ffffffffffffffda RBX: 0000000020000740 RCX: 0000000000456b29 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000004c1c8d RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000740 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d5bb8 R14: 00000000004c9491 R15: 0000000000000000 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..