Debian Bug report logs - #1082810
gscan2pdf: deadlock in tests if building as root

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Date: Thu, 26 Sep 2024 20:06:14 +0200
From: наб <[email protected]>
To: Debian Bug Tracking System <[email protected]>
Subject: gscan2pdf: deadlock in tests
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[Message part 1 (text/plain, inline)]

Source: gscan2pdf
Severity: serious
Version: 2.13.4-4
Tags: ftbfs
Justification: fails to build from source (but built successfully in the past)

Dear Maintainer,

During a ratt run for src:ossp-uuid, I see
  2024/09/26 16:46:59 Building package 68 of 123: gscan2pdf

It's currently 2024-09-26T17:03:48+02:00,
and the process tree looks like this:
  2992217   1628 S 0.0 0.0 0:00.00  └─ sh /usr/bin/xvfb-run -a dh_auto_test
  2992230   5284 S 0.0 0.0 0:00.11     ├─ perl /usr/bin/dh_auto_test
  2992237   2064 S 0.0 0.0 0:00.02     │  └─ make -j24 test TEST_VERBOSE=1
  2992252   5336 S 0.0 0.0 0:00.63     │     └─ perl -MExtUtils::Command::MM -MTest::Harness -e undef *Test::Harness::Switches; test_harness(1,
  3001120  75204 S 0.0 0.2 0:02.01     │        └─ perl t/1113_save_pdf_with_error.t
  3001252  75204 S 0.0 0.2 0:00.14     │           └─ perl t/1113_save_pdf_with_error.t
  2992227  50892 S 0.0 0.1 0:02.35     └─ Xvfb :99 -screen 0 1280x1024x24 -nolisten tcp -auth /tmp/xvfb-run.wk10k0/Xauthority
and hasn't changed the last few times I looked (3001252 is a thread).

strace says
  recvmsg(4, {msg_namelen=0}, 0)          = -1 EAGAIN (Resource temporarily unavailable)
  recvmsg(4, {msg_namelen=0}, 0)          = -1 EAGAIN (Resource temporarily unavailable)
  ppoll([{fd=4, events=POLLIN}, {fd=10, events=POLLIN}], 2, {tv_sec=0, tv_nsec=99179000}, NULL, 8) = 0 (Timeout)
  recvmsg(4, {msg_namelen=0}, 0)          = -1 EAGAIN (Resource temporarily unavailable)
  recvmsg(4, {msg_namelen=0}, 0)          = -1 EAGAIN (Resource temporarily unavailable)
  ppoll([{fd=4, events=POLLIN}, {fd=10, events=POLLIN}], 2, {tv_sec=0, tv_nsec=99457000}, NULL, 8) = 0 (Timeout)
  recvmsg(4, {msg_namelen=0}, 0)          = -1 EAGAIN (Resource temporarily unavailable)
  recvmsg(4, {msg_namelen=0}, 0)          = -1 EAGAIN (Resource temporarily unavailable)
  ppoll([{fd=4, events=POLLIN}, {fd=10, events=POLLIN}], 2, {tv_sec=0, tv_nsec=99636000}, NULL, 8) = 0 (Timeout)
  recvmsg(4, {msg_namelen=0}, 0)          = -1 EAGAIN (Resource temporarily unavailable)
  recvmsg(4, {msg_namelen=0}, 0)          = -1 EAGAIN (Resource temporarily unavailable)
  ppoll([{fd=4, events=POLLIN}, {fd=10, events=POLLIN}], 2, {tv_sec=0, tv_nsec=99280000}, NULL, 8^Cstrace: Process 3001120 detached
  
  futex(0x7f7054000ca4, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY^Cstrace: Process 3001252 detached
  
  epoll_wait(3, ^Cstrace: Process 2992227 detached

This is a ratt run, so the build is in a schroot.
I created the chroot this morning, so no funny business there.

I SIGINTed the test, and the tests continued.
The same happened with t/133_save_tiff_with_error.t later.
The same happened with t/1612_import_TIFF_with_error.t later.
The same happened with t/1626_import_PDF_with_error.t later.
The same happened with t/1632_import_ppm_with_error.t later.
The same happened with t/213_rotate_with_error.t later.
The same happened with t/243_threshold_with_error.t later.
The same happened with t/253_negate_with_error.t later.
The same happened with t/263_unsharp_mask_with_error.t later.
The same happened with t/273_crop_with_error.t later.
The same happened with t/283_to_png_with_error.t later.
The same happened with t/377_user_defined_with_error.t later.
One has to wonder if the error is that it hangs.

I'm attaching the build log.

Don't think this is the same as #1012250 since that's autopkgtests.

Naturally,
2024/09/26 17:21:32 building gscan2pdf failed: exit status 2
but I'm forced to assume this is due to whatever flakiness in the test?

I reproduce this behaviour with a plain sbuild -d unstable gscan2pdf
so it's not the fault of the new src:ossp-uuid.

Best,

-- System Information:
Debian Release: 12.4
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable-debug'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 6.1.0-12-amd64 (SMP w/24 CPU threads; PREEMPT)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_FIRMWARE_WORKAROUND, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE=en_GB:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

[gscan2pdf_2.13.4-4.zst (application/zstd, attachment)]

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