[mono] android crash: mono_get_image_for_generic_param [class.c : 2136]

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#113,202 2 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
20/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Tech stack
android, csharp
Domain
compilers, mobile-dev

Research direction

Start with src/mono/mono/metadata/class.c at line 2136 and trace the callers in src/mono/mono/metadata/metadata.c, especially collect_type_images and collect_method_images. Use the Android arm64 backtrace to investigate the generic-method metadata path; done means the reported SIGSEGV no longer occurs, with validation for this execution path.

Written by the indexing model from the issue text.

Description

area-VM-meta-mono os-android

signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x9b4058b89b7e26

x0  b400007b05f38418  x1  798478cbe0  x2  ffffffffffffffe0  x3  200007a6c8ab120

x4  200007a6c8ab160  x5  4f796e6100000000  x6  80616e794f  x7  664f7865656f49

x8  b89b4058b89b7e26  x9  b8951b25  x10 f  x11 1

x12 0  x13 bfa8  x14 55a44210  x15 3b682000

x16 7ccab01f20  x17 7ccaa871c0  x18 fffffffffffffee8  x19 798478cbe0

x20 b400007a2601ea90  x21 7977a8a151  x22 b400007b68454788  x23 0

x24 b400007b68454790  x25 0  x26 b400007b67f7a6e0  x27 b400007b67f7a6c0

x28 2  x29 798478cb50  lr  7977c6b340  sp  798478cb50

pc  7977c1ed30  pst 80001000

backtrace:

#00 pc 0000000000207d30  /data/app/~~WboABV-XCST2Uk9Ue-FUpg==/com.xxx.yyy--4rZWPSbZB-NwnEKxFXzlA==/lib/arm64/libmonosgen-2.0.so (mono_get_image_for_generic_param [src/mono/mono/metadata/class.c : 2136 + 0x0]) (BuildId: 42c8b61931986227e9bad5b46aa5cb7748fd9c9b)

#01 pc 000000000025433c  /data/app/~~WboABV-XCST2Uk9Ue-FUpg==/com.xxx.yyy--4rZWPSbZB-NwnEKxFXzlA==/lib/arm64/libmonosgen-2.0.so (collect_type_images [src/mono/mono/metadata/metadata.c : 3135 + 0x0]) (BuildId: 42c8b61931986227e9bad5b46aa5cb7748fd9c9b)

#02 pc 00000000002546e0 /data/app/~~WboABV-XCST2Uk9Ue-FUpg==/com.xxx.yyy--4rZWPSbZB-NwnEKxFXzlA==/lib/arm64/libmonosgen-2.0.so (collect_method_images [src/mono/mono/metadata/metadata.c : 3091 + 0x0]) (BuildId: 42c8b61931986227e9bad5b46aa5cb7748fd9c9b)

#03 pc 0000000000254610  /data/app/~~WboABV-XCST2Uk9Ue-FUpg==/com.xxx.yyy--4rZWPSbZB-NwnEKxFXzlA==/lib/arm64/libmonosgen-2.0.so (mono_metadata_get_mem_manager_for_method [src/mono/mono/metadata/metadata.c : 3343 + 0x0]) (BuildId: 42c8b61931986227e9bad5b46aa5cb7748fd9c9b)

#04 pc 000000000020632c  /data/app/~~WboABV-XCST2Uk9Ue-FUpg==/com.xxx.yyy--4rZWPSbZB-NwnEKxFXzlA==/lib/arm64/libmonosgen-2.0.so (mono_class_inflate_generic_method_full_checked [src/mono/mono/metadata/class.c : 1224 + 0x0]) (BuildId: 42c8b61931986227e9bad5b46aa5cb7748fd9c9b)

#05 pc 0000000000207130  /data/app/~~WboABV-XCST2Uk9Ue-FUpg==/com.xxx.yyy--4rZWPSbZB-NwnEKxFXzlA==/lib/arm64/libmonosgen-2.0.so (mono_class_get_method_by_index [src/mono/mono/metadata/class.c : 1735 + 0x0]) (BuildId: 42c8b61931986227e9bad5b46aa5cb7748fd9c9b)

#06 pc 0000000000241920 /data/app/~~WboABV-XCST2Uk9Ue-FUpg==/com.xxx.yyy--4rZWPSbZB-NwnEKxFXzlA==/lib/arm64/libmonosgen-2.0.so (find_method_in_class [src/mono/mono/metadata/loader.c : 506 + 0x0]) (BuildId: 42c8b61931986227e9bad5b46aa5cb7748fd9c9b)

#07 pc 0000000000241524  /data/app/~~WboABV-XCST2Uk9Ue-FUpg==/com.xxx.yyy--4rZWPSbZB-NwnEKxFXzlA==/lib/arm64/libmonosgen-2.0.so (find_method [src/mono/mono/metadata/loader.c : 548 + 0x0]) (BuildId: 42c8b61931986227e9bad5b46aa5cb7748fd9c9b)

#08 pc 0000000000241328  /data/app/~~WboABV-XCST2Uk9Ue-FUpg==/com.xxx.yyy--4rZWPSbZB-NwnEKxFXzlA==/lib/arm64/libmonosgen-2.0.so (method_from_memberref [src/mono/mono/metadata/loader.c : 0 + 0x0]) (BuildId: 42c8b61931986227e9bad5b46aa5cb7748fd9c9b)

#09 pc 000000000023f6bc  /data/app/~~WboABV-XCST2Uk9Ue-FUpg==/com.xxx.yyy--4rZWPSbZB-NwnEKxFXzlA==/lib/arm64/libmonosgen-2.0.so (mono_get_method_checked [src/mono/mono/metadata/loader.c : 1198 + 0x0]) (BuildId: 42c8b61931986227e9bad5b46aa5cb7748fd9c9b)

#10 pc 00000000000e6cc4 /data/app/~~WboABV-XCST2Uk9Ue-FUpg==/com.xxx.yyy--4rZWPSbZB-NwnEKxFXzlA==/lib/arm64/libmonosgen-2.0.so (mono_method_to_ir [src/mono/mono/mini/method-to-ir.c : 7654 + 0x0]) (BuildId: 42c8b61931986227e9bad5b46aa5cb7748fd9c9b)

#11 pc 00000000000cd1ac  /data/app/~~WboABV-XCST2Uk9Ue-FUpg==/com.xxx.yyy--4rZWPSbZB-NwnEKxFXzlA==/lib/arm64/libmonosgen-2.0.so (inline_method [src/mono/mono/mini/method-to-ir.c : 4825 + 0x0]) (BuildId: 42c8b61931986227e9bad5b46aa5cb7748fd9c9b)

#12 pc 00000000000e6c74  /data/app/~~WboABV-XCST2Uk9Ue-FUpg==/com.xxx.yyy--4rZWPSbZB-NwnEKxFXzlA==/lib/arm64/libmonosgen-2.0.so (mono_method_to_ir [src/mono/mono/mini/method-to-ir.c : 7873 + 0x0]) (BuildId: 42c8b61931986227e9bad5b46aa5cb7748fd9c9b)

#13 pc 00000000000be0a8  /data/app/~~WboABV-XCST2Uk9Ue-FUpg==/com.xxx.yyy--4rZWPSbZB-NwnEKxFXzlA==/lib/arm64/libmonosgen-2.0.so (mini_method_compile [src/mono/mono/mini/mini.c : 3498 + 0x0]) (BuildId: 42c8b61931986227e9bad5b46aa5cb7748fd9c9b)

#14 pc 00000000000c06e4  /data/app/~~WboABV-XCST2Uk9Ue-FUpg==/com.xxx.yyy--4rZWPSbZB-NwnEKxFXzlA==/lib/arm64/libmonosgen-2.0.so (mono_jit_compile_method_inner [src/mono/mono/mini/mini.c : 4132 + 0x0]) (BuildId: 42c8b61931986227e9bad5b46aa5cb7748fd9c9b)

#15 pc 00000000000c53b0  /data/app/~~WboABV-XCST2Uk9Ue-FUpg==/com.xxx.yyy--4rZW
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