Re: Linux 6.18-rc6

["David Wang" <00107082@163.com>]

At 2025-11-17 21:30:42, "David Hildenbrand (Red Hat)" <david@kernel.org> wrote:
>On 17.11.25 13:56, David Wang wrote:
>> 
>> At 2025-11-17 18:33:58, "Linus Torvalds" <torvalds@linux-foundation.org> wrote:
>>> On Mon, 17 Nov 2025 at 00:20, David Wang <00107082@163.com> wrote:
>>>>
>>>> After upgrade to 6.18-rc6, all my golang programs start to crash, even Go compiler crashes;
>>>> and when I started bisect, `make vmlinux` crashes too.
>>>
>>> Funky funky. Certainly doesn't happen here.
>>>
>>>> I am running bisect with 6.18-rc5 now, any chance this has already caught/fixed?
>>>
>>> Please do run the bisect (obviously you'll have to build using a
>>> kernel that works for you), I am not aware of anybody reporting
>>> anything like this.
>> 
>> Hi,
>> 
>> Bisect narrowed it down to
>> [adfb6609c6809e107ded9a1cd46f519c882e64ea] mm/huge_memory: initialise the tags of the huge zero folio
>> 
>> It seems happen to program build with older version of go, mine is 1.18.4;   and I cannot reproduce it with go1.25.4.
>> 
>> When I upgraded to 6.18-rc6,  go1.18.4 compiler/program would crash with,
>> 
>>      fatal error: arena already initialized
>>      
>>      runtime stack:
>>      runtime.throw({0x9ea9fe?, 0x0?})
>> 	    /usr/local/go/src/runtime/panic.go:992 +0x71 fp=0x7ffdf458a248 sp=0x7ffdf458a218 pc=0x435ab1
>>      runtime.(*mheap).sysAlloc(0xddec20, 0x0?)
>> 	    /usr/local/go/src/runtime/malloc.go:749 +0x2e9 fp=0x7ffdf458a2e0 sp=0x7ffdf458a248 pc=0x40dee9
>>      ...
>> 
>> 
>> And when I `make vmlinux`, I got something like this :
>> 	  AR      vmlinux.a
>> 	  LD      vmlinux.o
>> 	  GEN     .vmlinux.objs
>> 	  MODPOST vmlinux.symvers
>> 	  CC      .vmlinux.export.o
>> 	  UPD     include/generated/utsversion.h
>> 	  CC      init/version-timestamp.o
>> 	  KSYMS   .tmp_vmlinux0.kallsyms.S
>> 	  AS      .tmp_vmlinux0.kallsyms.o
>> 	  LD      .tmp_vmlinux1
>> 	  NM      .tmp_vmlinux1.syms
>> 	  KSYMS   .tmp_vmlinux1.kallsyms.S
>> 	  AS      .tmp_vmlinux1.kallsyms.o
>> 	.tmp_vmlinux1.kallsyms.S:361542:19: internal compiler error: Aborted
>> 	361542 |         .byte 0x00, 0x99, 0xe9  /* T__pfx___x64_sys_inotify_add_watch */
>> 	       |                   ^
>> 	0x7f983a551def ???
>> 		./signal/../sysdeps/unix/sysv/linux/x86_64/libc_sigaction.c:0
>> 	0x7f983a5a695c __pthread_kill_implementation
>> 		./nptl/pthread_kill.c:44
>> 	0x7f983a551cc1 __GI_raise
>> 		../sysdeps/posix/raise.c:26
>> 	0x7f983a53a4ab __GI_abort
>> 		./stdlib/abort.c:73
>> 	0x7f983a53bca7 __libc_start_call_main
>> 		../sysdeps/nptl/libc_start_call_main.h:58
>> 	0x7f983a53bd64 __libc_start_main_impl
>> 		../csu/libc-start.c:360
>> 	Please submit a full bug report, with preprocessed source (by using -freport-bug).
>> 	Please include the complete backtrace with any bug report.
>> 	See <file:///usr/share/doc/gcc-14/README.Bugs> for instructions.
>> 	make[2]: *** [scripts/Makefile.vmlinux:72: vmlinux.unstripped] Error 1
>> 	make[1]: *** [/home/linan/codes/linux-kernel/linux/Makefile:1242: vmlinux] Error 2
>> 	make: *** [Makefile:248: __sub-make] Error 2
>> $ gcc --version
>> gcc (Debian 14.2.0-19) 14.2.0
>> 
>> (It dose not always happens, sometimes I don't get this crash and It dose not always err on same line.)
>> 
>> And nothing abnormal shows up in kernel message.
>> 
>> Revert adfb6609c6809e107ded9a1cd46f519c882e64ea can fix my crashing go programs.
>
>
>I just replied privately to a similar report the following:
>
>Hi,
>
>I observed something similar while testing on Friday between rc4 (good)
>and rc5+ (bad).
>
>
>I'm sure this it the known issue of
>adfb6609c6809e107ded9a1cd46f519c882e64ea we discussed already here [1].
>
>
>@Jan, can you send the fix out today? Otherwise I can take care of this
>so we get this fixed asap.
>
>[1] https://lkml.kernel.org/r/20251109003613.1461433-1-japo@linux.ibm.com
>
>
>-- 
>Cheers
>
>David

Good to know~

My system is AMD, I would be glad to test the patch when it is ready.