The issue is fixed by reverting the following two patches:
commit b7bfa1af145a6aa3868894a4be82f7b2034c564a
Author: Linus Torvalds <[email protected]>
Date: Tue Jan 19 10:49:19 2021 -0800
tty: implement read_iter
BugLink: https://bugs.launchpad.net/bugs/1921960
[ Upstream commit dd78b0c483e33225e0e0782b0ed887129b00f956 ]
commit 4b71b60ef2cb9f930b8056049a1d8de170be42bc
Author: Linus Torvalds <[email protected]>
Date: Mon Jan 18 13:31:30 2021 -0800
tty: convert tty_ldisc_ops 'read()' function to take a kernel pointer
BugLink: https://bugs.launchpad.net/bugs/1921960
[ Upstream commit 3b830a9c34d5897be07176ce4e6f2d75e2c8cfd7 ]
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https://bugs.launchpad.net/bugs/1925290
Title:
hangup01 from pty in ubuntu_ltp_stable failed on G-5.8
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