input fucntion raises SystemError after specific input.

[Amiy]

BPO	38156
Nosy	@vstinner, @benjaminp, @miss-islington
PRs	closes bpo-38156: Always handle interrupts in PyOS_StdioReadline. #21569 [3.9] closes bpo-38156: Always handle interrupts in PyOS_StdioReadline. (GH-21569) #21670 [3.8] closes bpo-38156: Always handle interrupts in PyOS_StdioReadline. (GH-21569) #21671 bpo-38156: Fix compiler warning in PyOS_StdioReadline() #21721 [3.9] bpo-38156: Fix compiler warning in PyOS_StdioReadline() (GH-21721) #21723 [3.8] bpo-38156: Fix compiler warning in PyOS_StdioReadline() (GH-21721) #21725
Files	input-test.py: Input function test file.

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2020-07-29.00:57:19.070>
created_at = <Date 2019-09-13.10:31:38.783>
labels = ['type-bug', '3.7', 'expert-IO']
title = 'input fucntion raises SystemError after specific input.'
updated_at = <Date 2020-08-04.00:59:05.561>
user = 'https://bugs.python.org/Amiy'

bugs.python.org fields:

activity = <Date 2020-08-04.00:59:05.561>
actor = 'miss-islington'
assignee = 'none'
closed = True
closed_date = <Date 2020-07-29.00:57:19.070>
closer = 'benjamin.peterson'
components = ['IO']
creation = <Date 2019-09-13.10:31:38.783>
creator = 'Amiy'
dependencies = []
files = ['48606']
hgrepos = []
issue_num = 38156
keywords = ['patch']
message_count = 7.0
messages = ['352282', '374552', '374553', '374554', '374777', '374779', '374781']
nosy_count = 4.0
nosy_names = ['vstinner', 'benjamin.peterson', 'miss-islington', 'Amiy']
pr_nums = ['21569', '21670', '21671', '21721', '21723', '21725']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue38156'
versions = ['Python 3.7']

[Amiy]

input function raises a SystemError in bash(similar shells)
when given inputs follow a certain pattern, doesn't happen in python interactive shell.

It causes crash in python scripts even if KeyboardInterrupt and EOFError are handeled.

No EOFError or KeyboardInterrupt error is raised in such cases.

Tested with python script: (file input-test.py)
and command:
python -c 'input()'
both yield same result.

Inputs are represented as: ^D :- CTRL+d, ^C :- CTRL+c

eg:
input:
sometext^D^D^C

Traceback:
[182]$ python -c 'input()'
sometext^CKeyboardInterrupt

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
SystemError: <built-in function input> returned a result with an error set

---

inputs:
sometext^D^C^C [or even] sometext^Dsome-more^C^C

Traceback:
[191]$ python input-test.py
sometext^C^CKeyboardInterrupt

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "input-test.py", line 2, in <module>
    tmp = input()
SystemError: <built-in function input> returned a result with an error set

Python version: 3.7
Bash version: 5.0.11

[benjaminp]

New changeset a74eea2 by Benjamin Peterson in branch 'master':
closes bpo-38156: Always handle interrupts in PyOS_StdioReadline. (GH-21569)
a74eea2

[miss-islington]

New changeset 2221610 by Miss Islington (bot) in branch '3.9':
closes bpo-38156: Always handle interrupts in PyOS_StdioReadline. (GH-21569)
2221610

[miss-islington]

New changeset 7cfede6 by Miss Islington (bot) in branch '3.8':
closes bpo-38156: Always handle interrupts in PyOS_StdioReadline. (GH-21569)
7cfede6

[vstinner]

New changeset bde48fd by Victor Stinner in branch 'master':
bpo-38156: Fix compiler warning in PyOS_StdioReadline() (GH-21721)
bde48fd

[miss-islington]

New changeset b6724be by Miss Islington (bot) in branch '3.9':
bpo-38156: Fix compiler warning in PyOS_StdioReadline() (GH-21721)
b6724be

[miss-islington]

New changeset 46e448a by Miss Islington (bot) in branch '3.8':
bpo-38156: Fix compiler warning in PyOS_StdioReadline() (GH-21721)
46e448a