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Ip=[63.35.35.123]; Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM6PR08MB4168 Received-SPF: pass client-ip=40.107.7.42; envelope-from=Szabolcs.Nagy@arm.com; helo=EUR04-HE1-obe.outbound.protection.outlook.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/07 05:59:13 X-ACL-Warn: Detected OS = Windows NT kernel [generic] [fuzzy] X-Spam_score_int: -25 X-Spam_score: -2.6 X-Spam_bar: -- X-Spam_report: (-2.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_MED=0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, MSGID_FROM_MTA_HEADER=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: nd@arm.com, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" The 05/06/2020 13:57, Szabolcs Nagy wrote: > However later on during testing malloc with PROT_MTE > i got a qemu assert failure: > > Bail out! ERROR:/S/target/arm/mte_helper.c:97:allocation_tag_mem: assertion failed: (tag_size <= in_page) > > i can reproduce it, but i don't know how to debug it > further, i don't know what the application is doing > when this happens, nor what the kernel is doing. actually i know what the application is doing, it's in an mmap when qemu aborts: ... 23:15:17.379227 munmap(0x100ffff9675a000, 8192) = 0 23:15:17.428456 mmap(NULL, 8192, PROT_READ|PROT_WRITE|0x20, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xffff9675a000 23:15:17.502543 mmap(NULL, 36864, PROT_READ|PROT_WRITE|0x20, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xffff96707000 23:15:17.572469 munmap(0x100ffff96707000, 36864) = 0 23:15:17.645050 munmap(0x100ffff9675a000, 8192) = 0 23:15:17.721526 mmap(NULL, 8192, PROT_READ|PROT_WRITE|0x20, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xffff9675a000 23:15:17.779768 mmap(NULL, 36864, PROT_READ|PROT_WRITE|0x20, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xffff96707000 23:15:17.840278 newfstatat(3, "usr/lib", {st_mode=S_IFDIR|0755, st_size=4096, ...}, AT_SYMLINK_NOFOLLOW) = 0 23:15:18.164292 unlinkat(3, "usr/lib/.apk.1e1bebb420b720c23f29fc2cacd5581b598339805fd12c00", 0) = 0 23:15:18.357742 symlinkat("libXau.so.6.0.0", 3, "usr/lib/.apk.1e1bebb420b720c23f29fc2cacd5581b598339805fd12c00") = 0 23:15:18.469921 fchownat(3, "usr/lib/.apk.1e1bebb420b720c23f29fc2cacd5581b598339805fd12c00", 0, 0, AT_SYMLINK_NOFOLLOW) = 0 23:15:18.638698 unlinkat(3, "usr/lib/.apk.93d31976aebb056b6e2d9577dc8a2f112e28756d03f736a4", 0) = 0 23:15:18.760374 openat(3, "usr/lib/.apk.93d31976aebb056b6e2d9577dc8a2f112e28756d03f736a4", O_RDWR|O_CREAT|O_EXCL|O_TRUNC|O_LARGEFILE|O_CLOEXEC, 0755) = 8 23:15:18.916049 write(8, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0\267\0\1\0\0\0\300\r\0\0\0\0\0\0@\0\0\0\0\0\0\0\3700\0\0\0\0\0\0\0\0\0\0@\08\0\6\0@\0\26\0\25\0\1\0\0\0\5\0"..., 13944) = 13944 23:15:18.961239 close(8) = 0 23:15:20.137627 fchownat(3, "usr/lib/.apk.93d31976aebb056b6e2d9577dc8a2f112e28756d03f736a4", 0, 0, 0) = 0 23:15:20.289924 utimensat(3, "usr/lib/.apk.93d31976aebb056b6e2d9577dc8a2f112e28756d03f736a4", [{tv_sec=1579395233, tv_nsec=0} /* 2020-01-19T00:53:53+0000 */, {tv_sec=1579395233, tv_nsec=0} /* 2020-01-19T00:53:53+0000 */], 0) = 0 23:15:20.467212 munmap(0x100ffff96707000, 36864) = 0 23:15:20.503631 munmap(0x100ffff9675a000, 8192) = 0 23:15:20.550130 mmap(NULL, 8192, PROT_READ|PROT_WRITE|0x20, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0Connection to localhost closed by remote host. (this allocator does a lot of small mmap and munmap) but i cant tell what happens on the kernel side. is there some recommended way to turn some form of tracing on in qemu before i execute the problematic application? or is it better if i try to extract a reproducer? (that does not use the network) > > i rebuilt qemu with --enable-debug but now it's very > slow (still booting into linux 3h later). this is too slow, things time out.