Package: lttng-modules-dkms
Version: 2.12.5-1+deb11u1
Severity: serious
Control: found -1 2.13.9-1

Hi,

the bullseye kernel at some point seems to have enabled
-Werror=implicit-function-declaration, causing the module to now fail to
build:

DKMS make.log for lttng-modules-2.12.5 for kernel 5.10.0-33-amd64 (x86_64)
Thu Feb 13 11:24:13 CET 2025
make: Entering directory '/usr/src/linux-headers-5.10.0-33-amd64'
  CC [M]  
/var/lib/dkms/lttng-modules/2.12.5/build/lttng-ring-buffer-client-discard.o
  CC [M]  
/var/lib/dkms/lttng-modules/2.12.5/build/lttng-ring-buffer-client-overwrite.o
  CC [M]  
/var/lib/dkms/lttng-modules/2.12.5/build/lttng-ring-buffer-metadata-client.o
  CC [M]  
/var/lib/dkms/lttng-modules/2.12.5/build/lttng-ring-buffer-client-mmap-discard.o
  CC [M]  
/var/lib/dkms/lttng-modules/2.12.5/build/lttng-ring-buffer-client-mmap-overwrite.o
  CC [M]  
/var/lib/dkms/lttng-modules/2.12.5/build/lttng-ring-buffer-metadata-mmap-client.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-clock.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-events.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-abi.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-string-utils.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-probes.o
/var/lib/dkms/lttng-modules/2.12.5/build/probes/Kbuild:62: File 
/usr/src/linux-headers-5.10.0-33-common/arch/x86/kvm/lapic.h not found. Probe 
"kvm" x86-specific is disabled. Use full kernel source tree to enable it.
/var/lib/dkms/lttng-modules/2.12.5/build/probes/Kbuild:166: Files 
/usr/src/linux-headers-5.10.0-33-common/fs/btrfs/*.h not found. Probe "btrfs" 
is disabled. Use full kernel source tree to enable it.
/var/lib/dkms/lttng-modules/2.12.5/build/probes/Kbuild:177: Files 
/usr/src/linux-headers-5.10.0-33-common/fs/ext4/*.h not found. Probe "ext4" is 
disabled. Use full kernel source tree to enable it.
/var/lib/dkms/lttng-modules/2.12.5/build/probes/Kbuild:206: File 
/usr/src/linux-headers-5.10.0-33-common/drivers/base/regmap/trace.h not found. 
Probe "regmap" is disabled. Need Linux 4.1+ kernel source tree to enable it.
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/tests/probes/lttng-test.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-probe-sched.o
  CC [M]  
/var/lib/dkms/lttng-modules/2.12.5/build/lib/ringbuffer/ring_buffer_backend.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-context.o
  CC [M]  
/var/lib/dkms/lttng-modules/2.12.5/build/lib/ringbuffer/ring_buffer_frontend.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-context-pid.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-context-procname.o
  CC [M]  
/var/lib/dkms/lttng-modules/2.12.5/build/tests/clock-plugin/lttng-clock-plugin-test.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-probe-irq.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-probe-timer.o
  LD [M]  /var/lib/dkms/lttng-modules/2.12.5/build/tests/lttng-test.o
  CC [M]  
/var/lib/dkms/lttng-modules/2.12.5/build/lib/ringbuffer/ring_buffer_iterator.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-context-prio.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-probe-kmem.o
  CC [M]  
/var/lib/dkms/lttng-modules/2.12.5/build/lib/ringbuffer/ring_buffer_vfs.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-probe-module.o
  CC [M]  
/var/lib/dkms/lttng-modules/2.12.5/build/lib/ringbuffer/ring_buffer_splice.o
  LD [M]  
/var/lib/dkms/lttng-modules/2.12.5/build/tests/lttng-clock-plugin-test.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-context-nice.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-probe-power.o
  CC [M]  
/var/lib/dkms/lttng-modules/2.12.5/build/lib/ringbuffer/ring_buffer_mmap.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-context-vpid.o
  CC [M]  
/var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-probe-statedump.o
  CC [M]  
/var/lib/dkms/lttng-modules/2.12.5/build/lib/prio_heap/lttng_prio_heap.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-context-tid.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-probe-9p.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-probe-i2c.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lib/../wrapper/splice.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-probe-kvm.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-context-vtid.o
  CC [M]  
/var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-probe-x86-irq-vectors.o
  CC [M]  
/var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-probe-x86-exceptions.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-context-ppid.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-context-vppid.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-probe-signal.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-probe-block.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-probe-napi.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-probe-skb.o
  LD [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lib/lttng-lib-ring-buffer.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-context-cpu-id.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-probe-net.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-context-uid.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-context-euid.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-context-suid.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-probe-sock.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-probe-udp.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-context-gid.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-probe-asoc.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-context-egid.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-context-sgid.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-probe-gpio.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-probe-jbd2.o
  CC [M]  
/var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-probe-regulator.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-probe-scsi.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-context-vuid.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-context-veuid.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-probe-vmscan.o
  CC [M]  
/var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-probe-compaction.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-probe-printk.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-probe-rcu.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-context-vsuid.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-context-vgid.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-probe-sunrpc.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-probe-v4l2.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-context-vegid.o
  CC [M]  
/var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-probe-workqueue.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-context-vsgid.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-context-interruptible.o
  CC [M]  
/var/lib/dkms/lttng-modules/2.12.5/build/lttng-context-need-reschedule.o
  CC [M]  
/var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-probe-writeback.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-context-callstack.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-kprobes.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-uprobes.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-kretprobes.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-calibrate.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-context-hostname.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-tracker-id.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-filter.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-filter-interpreter.o
In file included from 
/var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-uprobes.c:12:
/var/lib/dkms/lttng-modules/2.12.5/build/probes/../wrapper/fdtable.h: In 
function 'lttng_lookup_fd_rcu':
/var/lib/dkms/lttng-modules/2.12.5/build/probes/../wrapper/fdtable.h:25:9: 
error: implicit declaration of function 'fcheck' 
[-Werror=implicit-function-declaration]
   25 |  return fcheck(fd);
      |         ^~~~~~
/var/lib/dkms/lttng-modules/2.12.5/build/probes/../wrapper/fdtable.h:25:9: 
warning: returning 'int' from a function with return type 'struct file *' makes 
pointer from integer without a cast [-Wint-conversion]
   25 |  return fcheck(fd);
      |         ^~~~~~~~~~
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-filter-specialize.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-filter-validator.o
cc1: some warnings being treated as errors
make[3]: *** 
[/usr/src/linux-headers-5.10.0-33-common/scripts/Makefile.build:291: 
/var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-uprobes.o] Error 1
make[3]: *** Waiting for unfinished jobs....
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/probes/lttng-probe-user.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-tp-mempool.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-syscalls.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-context-perf-counters.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-tracepoint.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-context-cgroup-ns.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-context-ipc-ns.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-context-net-ns.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-context-pid-ns.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-context-user-ns.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-context-uts-ns.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/wrapper/page_alloc.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/wrapper/random.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/wrapper/trace-clock.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/wrapper/kallsyms.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/wrapper/irqdesc.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/wrapper/fdtable.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-wrapper-impl.o
  CC [M]  /var/lib/dkms/lttng-modules/2.12.5/build/lttng-statedump-impl.o
make[2]: *** 
[/usr/src/linux-headers-5.10.0-33-common/scripts/Makefile.build:508: 
/var/lib/dkms/lttng-modules/2.12.5/build/probes] Error 2
make[2]: *** Waiting for unfinished jobs....
In file included from 
/var/lib/dkms/lttng-modules/2.12.5/build/wrapper/fdtable.c:9:
/var/lib/dkms/lttng-modules/2.12.5/build/wrapper/fdtable.h: In function 
'lttng_lookup_fd_rcu':
/var/lib/dkms/lttng-modules/2.12.5/build/wrapper/fdtable.h:25:9: error: 
implicit declaration of function 'fcheck' 
[-Werror=implicit-function-declaration]
   25 |  return fcheck(fd);
      |         ^~~~~~
/var/lib/dkms/lttng-modules/2.12.5/build/wrapper/fdtable.h:25:9: warning: 
returning 'int' from a function with return type 'struct file *' makes pointer 
from integer without a cast [-Wint-conversion]
   25 |  return fcheck(fd);
      |         ^~~~~~~~~~
cc1: some warnings being treated as errors
make[2]: *** 
[/usr/src/linux-headers-5.10.0-33-common/scripts/Makefile.build:291: 
/var/lib/dkms/lttng-modules/2.12.5/build/wrapper/fdtable.o] Error 1
In file included from 
/var/lib/dkms/lttng-modules/2.12.5/build/lttng-statedump-impl.c:39:
/var/lib/dkms/lttng-modules/2.12.5/build/wrapper/fdtable.h: In function 
'lttng_lookup_fd_rcu':
/var/lib/dkms/lttng-modules/2.12.5/build/wrapper/fdtable.h:25:9: error: 
implicit declaration of function 'fcheck'; did you mean 'bpf_check'? 
[-Werror=implicit-function-declaration]
   25 |  return fcheck(fd);
      |         ^~~~~~
      |         bpf_check
/var/lib/dkms/lttng-modules/2.12.5/build/wrapper/fdtable.h:25:9: warning: 
returning 'int' from a function with return type 'struct file *' makes pointer 
from integer without a cast [-Wint-conversion]
   25 |  return fcheck(fd);
      |         ^~~~~~~~~~
cc1: some warnings being treated as errors
make[2]: *** 
[/usr/src/linux-headers-5.10.0-33-common/scripts/Makefile.build:291: 
/var/lib/dkms/lttng-modules/2.12.5/build/lttng-statedump-impl.o] Error 1
make[1]: *** [/usr/src/linux-headers-5.10.0-33-common/Makefile:1856: 
/var/lib/dkms/lttng-modules/2.12.5/build] Error 2
make: *** [/usr/src/linux-headers-5.10.0-33-common/Makefile:192: __sub-make] 
Error 2
make: Leaving directory '/usr/src/linux-headers-5.10.0-33-amd64'


This also affects the version in bookworm. On distupgrades from bullseye
to bookworm, kernels and headers from both releases are installed and
therefore lttng-modules-dkms/bookworm needs to be able to build a module
for the bullseye kernel.

(lttng-modules-dkms/bookworm builds fine for 6.1.0-31-amd64, the
bookworm kernel)

Linux commit 460b4f812a9d473d4b39d87d37844f9fc30a9eb3 from v5.11-rc1 has
been backported as c4716bb296504cbc64aeefb370df44e821214c44 to
v5.10.220

A possible fix for bookworm could be in include/wrapper/fdtable.h to
replace
  #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,11,0))
with
  #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,10,220))

Andreas

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