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Mon, 25 Mar 2024 18:17:44 -0700 (PDT) Received: from [10.72.112.68] ([43.228.180.230]) by smtp.gmail.com with ESMTPSA id y10-20020a170902700a00b001ddb505d50asm5414251plk.244.2024.03.25.18.17.41 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 25 Mar 2024 18:17:44 -0700 (PDT) Message-ID: Date: Tue, 26 Mar 2024 09:17:38 +0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: kernel BUG at mm/usercopy.c:102 -- pc : usercopy_abort Content-Language: en-US To: Ilya Dryomov , David Hildenbrand Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Ceph Development , linux-fsdevel@vger.kernel.org, Vlastimil Babka References: <6f5b9d18-2d04-495c-970c-eb5eada5f676@redhat.com> From: Xiubo Li In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 3/26/24 03:37, Ilya Dryomov wrote: > On Mon, Mar 25, 2024 at 6:39 PM David Hildenbrand wrote: >> On 25.03.24 13:06, Xiubo Li wrote: >>> On 3/25/24 18:14, David Hildenbrand wrote: >>>> On 25.03.24 08:45, Xiubo Li wrote: >>>>> Hi guys, >>>>> >>>>> We are hitting the same crash frequently recently with the latest kernel >>>>> when testing kceph, and the call trace will be something likes: >>>>> >>>>> [ 1580.034891] usercopy: Kernel memory exposure attempt detected from >>>>> SLUB object 'kmalloc-192' (offset 82, size 499712)!^M >>>>> [ 1580.045866] ------------[ cut here ]------------^M >>>>> [ 1580.050551] kernel BUG at mm/usercopy.c:102!^M >>>>> ^M >>>>> Entering kdb (current=0xffff8881211f5500, pid 172901) on processor 4 >>>>> Oops: (null)^M >>>>> due to oops @ 0xffffffff8138cabd^M >>>>> CPU: 4 PID: 172901 Comm: fsstress Tainted: G S 6.6.0-g623393c9d50c #1^M >>>>> Hardware name: Supermicro SYS-5018R-WR/X10SRW-F, BIOS 1.0c 09/07/2015^M >>>>> RIP: 0010:usercopy_abort+0x6d/0x80^M >>>>> Code: 4c 0f 44 d0 41 53 48 c7 c0 1c e9 13 82 48 c7 c6 71 62 13 82 48 0f >>>>> 45 f0 48 89 f9 48 c7 c7 f0 6b 1b 82 4c 89 d2 e8 63 2b df ff <0f> 0b 49 >>>>> c7 c1 44 c8 14 82 4d 89 cb 4d 89 c8 eb a5 66 90 f3 0f 1e^M >>>>> RSP: 0018:ffffc90006dfba88 EFLAGS: 00010246^M >>>>> RAX: 000000000000006a RBX: 000000000007a000 RCX: 0000000000000000^M >>>>> RDX: 0000000000000000 RSI: ffff88885fd1d880 RDI: ffff88885fd1d880^M >>>>> RBP: 000000000007a000 R08: 0000000000000000 R09: c0000000ffffdfff^M >>>>> R10: 0000000000000001 R11: ffffc90006dfb930 R12: 0000000000000001^M >>>>> R13: ffff8882b7bbed12 R14: ffff88827a375830 R15: ffff8882b7b44d12^M >>>>> FS: 00007fb24c859500(0000) GS:ffff88885fd00000(0000) >>>>> knlGS:0000000000000000^M >>>>> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033^M >>>>> CR2: 000055c2bcf9eb00 CR3: 000000028956c005 CR4: 00000000001706e0^M >>>>> Call Trace:^M >>>>> ^M >>>>> ? kdb_main_loop+0x32c/0xa10^M >>>>> ? kdb_stub+0x216/0x420^M >>>>> more> >>>>> >>>>> You can see more detail in ceph tracker >>>>> https://tracker.ceph.com/issues/64471. >>>> Where is the full backtrace? Above contains only the backtrace of kdb. >>>> >>> Hi David, >>> >>> The bad news is that there is no more backtrace. All the failures we hit >>> are similar with the following logs: >>> >> That's unfortunate :/ >> >> "exposure" in the message means we are in copy_to_user(). >> >> SLUB object 'kmalloc-192' means that we come from __check_heap_object() >> ... we have 192 bytes, but the length we want to access is 499712 ... >> 488 KiB. >> >> So we ended up somehow in >> >> __copy_to_user()->check_object_size()->__check_object_size()-> >> check_heap_object()->__check_heap_object()->usercopy_abort() >> >> >> ... but the big question is which code tried to copy way too much memory >> out of a slab folio to user space. >> >>>> That link also contains: >>>> >>>> Entering kdb (current=0xffff9115d14fb980, pid 61925) on processor 5 >>>> Oops: (null)^M >>>> due to oops @ 0xfffffffface3a1d2^M >>>> CPU: 5 PID: 61925 Comm: ld Kdump: loaded Not tainted >>>> 5.14.0-421.el9.x86_64 #1^M >>>> Hardware name: Supermicro SYS-5018R-WR/X10SRW-F, BIOS 2.0 12/17/2015^M >>>> RIP: 0010:usercopy_abort+0x74/0x76^M >>>> Code: 14 74 ad 51 48 0f 44 d6 49 c7 c3 cb 9f 73 ad 4c 89 d1 57 48 c7 >>>> c6 60 83 75 ad 48 c7 c7 00 83 75 ad 49 0f 44 f3 e8 1b 3b ff ff <0f> 0b >>>> 0f b6 d3 4d 89 e0 48 89 e9 31 f6 48 c7 c7 7f 83 75 ad e8 73^M >>>> RSP: 0018:ffffbb97c16af8d0 EFLAGS: 00010246^M >>>> RAX: 0000000000000072 RBX: 0000000000000112 RCX: 0000000000000000^M >>>> RDX: 0000000000000000 RSI: ffff911d1fd60840 RDI: ffff911d1fd60840^M >>>> RBP: 0000000000004000 R08: 80000000ffff84b4 R09: 0000000000ffff0a^M >>>> R10: 0000000000000004 R11: 0000000000000076 R12: ffff9115c0be8b00^M >>>> R13: 0000000000000001 R14: ffff911665df9f68 R15: ffff9115d16be112^M >>>> FS: 00007ff20442eb80(0000) GS:ffff911d1fd40000(0000) >>>> knlGS:0000000000000000^M >>>> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033^M >>>> CR2: 00007ff20446142d CR3: 00000001215ec003 CR4: 00000000003706e0^M >>>> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000^M >>>> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400^M >>>> Call Trace:^M >>>> ^M >>>> ? show_trace_log_lvl+0x1c4/0x2df^M >> >> ... are we stuck in show_trace_log_lvl(), probably deadlocked not being >> able to print the actuall callstack? If so, that's nasty. > Hi David, > > I don't think so. This appears to be a cut-and-paste from what is > essentially a non-interactive serial console. Stack trace entries > prefixed with ? aren't exact and kdb prompt > > more> > > is there in all cases which is what hides the rest of the stack. > > There are four ways to get the entire stack trace here: > > a) try to attach to the serial console and interact with kdb -- this > is very much hit or miss due to general IPMI/BMC unreliability and > the fact that it would be already attached to for logging > b) disable kdb by passing "kdb: false" in the job definition -- this > should result in /sys/module/kgdboc/parameters/kgdboc cleared after > booting into the kernel under test (or just hack teuthology to not > pass "kdb: true" which it does by default if "-k " is given > when scheduling) > c) if b) fails, rebuild the kernel with kdb disabled in Kconfig > d) configure kdump and grab a vmcore -- these is no teuthology support > for this, so it would be challenging but would provide the most data > to chew on > > Xiubo, I'd recommend going with b), but take your pick ;) Thanks Ilya Let's try the b) first and to see could we find something new. Thanks - Xiubo > Thanks, > > Ilya >