Crash maybe related to `nif_erlang_dist_ctrl_put_data`

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#1,883 opened on Oct 8, 2025 1 comment 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 4/5
Estimated time: 3-5 days
Newbie friendliness: 35/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Stale
Tech stack: c, erlang
Domain: backend, operating-systems

Research direction

Start with src/libAtomVM/dist_nifs.c around nif_erlang_dist_ctrl_put_data and follow the backtrace into src/libAtomVM/nifs.c and src/libAtomVM/scheduler.c, especially scheduler_make_ready. Use the linked core dump and the reported test_estdlib.avm crash to investigate the failing lock path. Done when the segmentation fault is reproducibly fixed and the distribution tests pass.

Written by the indexing model from the issue text.

Description

Following crash has been observed here first time: https://github.com/atomvm/AtomVM/actions/runs/18310690206/job/52138386516

coredump is available here:
core-ubuntu-22.04-gcc-11-27-18310690206-1.zip

backtrace:

#0  0x0000563307443688 in smp_spinlock_lock (lock=<optimized out>) at /home/runner/work/AtomVM/AtomVM/src/libAtomVM/smp.h:219
#1  scheduler_make_ready (ctx=ctx@entry=0x7f737802fb30) at /home/runner/work/AtomVM/AtomVM/src/libAtomVM/scheduler.c:352
#2  0x0000563307443fc9 in scheduler_init_ready (c=c@entry=0x7f737802fb30)
    at /home/runner/work/AtomVM/AtomVM/src/libAtomVM/scheduler.c:410
#3  0x0000563307435573 in do_spawn (ctx=ctx@entry=0x7f7374025740, new_ctx=0x7f737802fb30, arity=<optimized out>,
    n_freeze=<optimized out>, opts_term=<optimized out>) at /home/runner/work/AtomVM/AtomVM/src/libAtomVM/nifs.c:1317
#4  0x0000563307435c93 in nif_erlang_spawn_opt (ctx=ctx@entry=0x7f7374025740, argc=argc@entry=4, argv=argv@entry=0x7f737f9fecc0)
    at /home/runner/work/AtomVM/AtomVM/src/libAtomVM/nifs.c:1424
#5  0x0000563307454c0c in nif_erlang_dist_ctrl_put_data (argv=0x7f7374025770, argc=<optimized out>, ctx=0x7f7374025740)
    at /home/runner/work/AtomVM/AtomVM/src/libAtomVM/dist_nifs.c:611
#6  nif_erlang_dist_ctrl_put_data (ctx=0x7f7374025740, argc=<optimized out>, argv=0x7f7374025770)
    at /home/runner/work/AtomVM/AtomVM/src/libAtomVM/dist_nifs.c:448
#7  0x00005633073a6a17 in scheduler_entry_point (glb=0x56332ee782a0)
    at /home/runner/work/AtomVM/AtomVM/src/libAtomVM/opcodesswitch.h:2027
#8  0x00005633074615d6 in scheduler_thread_entry_point (arg=<optimized out>)
    at /home/runner/work/AtomVM/AtomVM/src/platforms/generic_unix/lib/smp.c:75
#9  0x00007f737fa94ac3 in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:442

Last observed messages from test_estdlib.avm:


GEN_TCP-TEST> ServerBackendOption=[{inet_backend,inet}] ClientBackendOption=[{inet_backend,inet}] ListenMode=list ConnectMode=binary ListenActive=false ConnectActive=false
GEN_TCP-TEST> ServerBackendOption=[{inet_backend,inet}] ClientBackendOption=[{inet_backend,inet}] ListenMode=list ConnectMode=binary ListenActive=false ConnectActive=true
GEN_TCP-TEST> ServerBackendOption=[{inet_backend,inet}] ClientBackendOption=[{inet_backend,inet}] ListenMode=list ConnectMode=binary ListenActive=true ConnectActive=false
GEN_TCP-TEST> ServerBackendOption=[{inet_backend,inet}] ClientBackendOption=[{inet_backend,inet}] ListenMode=list ConnectMode=binary ListenActive=true ConnectActive=true
GEN_TCP-TEST> ServerBackendOption=[{inet_backend,inet}] ClientBackendOption=[{inet_backend,inet}] ListenMode=list ConnectMode=list ListenActive=false ConnectActive=false
GEN_TCP-TEST> ServerBackendOption=[{inet_backend,inet}] ClientBackendOption=[{inet_backend,inet}] ListenMode=list ConnectMode=list ListenActive=false ConnectActive=true
GEN_TCP-TEST> ServerBackendOption=[{inet_backend,inet}] ClientBackendOption=[{inet_backend,inet}] ListenMode=list ConnectMode=list ListenActive=true ConnectActive=false
GEN_TCP-TEST> ServerBackendOption=[{inet_backend,inet}] ClientBackendOption=[{inet_backend,inet}] ListenMode=list ConnectMode=list ListenActive=true ConnectActive=true
CRASH 
======
pid: <0.1931.0>

Stacktrace:
[{socket_dist_controller,recv_data_loop,1,[{file,"/home/runner/work/AtomVM/AtomVM/libs/estdlib/src/socket_dist_controller.erl"},{line,173}]},{socket_dist_controller,handle_info,2,[{file,"/home/runner/work/AtomVM/AtomVM/libs/estdlib/src/socket_dist_controller.erl"},{line,161}]},{gen_server,loop,3,[{file,"/home/runner/work/AtomVM/AtomVM/libs/estdlib/src/gen_server.erl"},{line,551}]}]

cp: #CP<module: 70, label: 51, offset: 27>

x[0]: error
x[1]: {case_clause,{error,closed}}
x[2]: {3,3,138,2,[{4,3156},{70,1118},{70,1554}],error}

Stack 
-----

[]
{state,{<<"">>,#Ref<0.0.5879>},<<"">>,#Ref<0.0.5904>,<<"">>,3,1}
#CP<module: 70, label: 44, offset: 69>
#CP<module: 4, label: 112, offset: 21>
[]
[]
[]
{state,{<<"">>,#Ref<0.0.5879>},<<"">>,#Ref<0.0.5904>,<<"">>,3,1}
[]
{state,undefined,socket_dist_controller,{state,{<<"">>,#Ref<0.0.5879>},<<"">>,#Ref<0.0.5904>,<<"">>,3,1}}
<0.1930.0>
#CP<module: 4, label: 137, offset: 0>


Mailbox
-------


Monitors
--------
link to <0.1932.0>
monitored by resource 0x7f73700072f8 ref=5895
monitored by resource 0x7f73780042b8 ref=5899


**End Of Crash Report**
++dist_util: shutting down connection dist_util:529, data={otp@runnervmafkv5,invalid_challenge}, reason=shutdown
CRASH 
======
pid: <0.1962.0>

Stacktrace:
[{erpc,execute_call,4,[{file,"/home/runner/work/AtomVM/AtomVM/libs/estdlib/src/erpc.erl"},{line,59}]}]

cp: #CP<module: 72, label: 2, offset: 27>

x[0]: exit
x[1]: {#Ref<1666.3375636846.2655256579.102929>,return,"ATOM"}
x[2]: {1,1,57,1,[{72,125}],exit}

Stack 
-----

[]
#Ref<1666.3375636846.2655256579.102929>
[]
#CP<module: 72, label: 12, offset: 0>


Mailbox
-------


Monitors
--------
monitored by resource 0x56332ee9b468 ref=5984


**End Of Crash Report**
CRASH 
======
pid: <0.1959.0>

Stacktrace:
[{socket_dist_controller,recv_data_loop,1,[{file,"/home/runner/work/AtomVM/AtomVM/libs/estdlib/src/socket_dist_controller.erl"},{line,173}]},{socket_dist_controller,handle_info,2,[{file,"/home/runner/work/AtomVM/AtomVM/libs/estdlib/src/socket_dist_controller.erl"},{line,161}]},{gen_server,loop,3,[{file,"/home/runner/work/AtomVM/AtomVM/libs/estdlib/src/gen_server.erl"},{line,551}]}]

cp: #CP<module: 70, label: 51, offset: 27>

x[0]: error
x[1]: {case_clause,{error,closed}}
x[2]: {3,3,138,2,[{4,3156},{70,1118},{70,1554}],error}

Stack 
-----

[]
{state,{<<"">>,#Ref<0.0.5962>},<<"">>,#Ref<0.0.5985>,<<"">>,1,2}
#CP<module: 70, label: 44, offset: 69>
#CP<module: 4, label: 112, offset: 21>
[]
[]
[]
{state,{<<"">>,#Ref<0.0.5962>},<<"">>,#Ref<0.0.5985>,<<"">>,1,2}
[]
{state,undefined,socket_dist_controller,{state,{<<"">>,#Ref<0.0.5962>},<<"">>,#Ref<0.0.5985>,<<"">>,1,2}}
<0.1958.0>
#CP<module: 4, label: 137, offset: 0>


Mailbox
-------


Monitors
--------
link to <0.1960.0>
monitored by resource 0x56332ee9b468 ref=5978
monitored by resource 0x7f737802eb18 ref=5982


**End Of Crash Report**
CRASH 
======
pid: <0.1977.0>

Stacktrace:
[{erpc,execute_call,4,[{file,"/home/runner/work/AtomVM/AtomVM/libs/estdlib/src/erpc.erl"},{line,59}]}]

cp: #CP<module: 72, label: 2, offset: 27>

x[0]: exit
x[1]: {#Ref<1666.456103427.2923954179.64219>,return,"ATOM"}
x[2]: {1,1,57,1,[{72,125}],exit}

Stack 
-----

#Ref<1666.456103427.2923954179.64219>
[]
#CP<module: 72, label: 12, offset: 0>


Mailbox
-------


Monitors
--------
monitored by resource 0x7f7370029548 ref=6030


**End Of Crash Report**
/home/runner/work/_temp/c1c1be6a-d0ae-48dc-b96f-91741858de62.sh: line 3: 17204 Segmentation fault      (core dumped) ./src/AtomVM ./tests/libs/estdlib/test_estdlib.avm
Error: Process completed with exit code 139.

It has been observed also here:
https://github.com/atomvm/AtomVM/actions/runs/18310690206/job/52138386539

Dominant language: Erlang
Stars: 2.3k
Forks: 171
Avg merge: 4d 11h
Merged PRs (30d): 20

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