[BUG] 2.1.243 segfaults on startup - glibc 2.44 / Bun runtime crash in newlocale()

Also impacted, arch linux kernel dmesg:
[304778.679561] claude[1612305]: segfault at 0 ip 0000000001d10458 sp 00007fff00fbf3a0 error 4 in 2.1.243[1b0f458,1953000+3b33000] likely on CPU 0 (core 0, socket 0)
[304778.679573] Code: cc cc 55 48 89 e5 48 89 fe 48 8b 05 82 19 78 03 48 89 f9 48 c1 e9 1d 48 8b 84 c8 80 00 00 00 89 f1 c1 e9 0d 81 e1 f8 ff 00 00 <48> 8b 3c 08 48 85 ff 74 1e 48 8b 07 64 48 33 04 25 00 00 00 00 75
[304826.313168] claude[1612710]: segfault at 0 ip 0000000001d10458 sp 00007fff1b8900b0 error 4 in 2.1.243[1b0f458,1953000+3b33000] likely on CPU 7 (core 3, socket 0)
[304826.313186] Code: cc cc 55 48 89 e5 48 89 fe 48 8b 05 82 19 78 03 48 89 f9 48 c1 e9 1d 48 8b 84 c8 80 00 00 00 89 f1 c1 e9 0d 81 e1 f8 ff 00 00 <48> 8b 3c 08 48 85 ff 74 1e 48 8b 07 64 48 33 04 25 00 00 00 00 75
[304847.859161] claude[1612775]: segfault at 0 ip 0000000001d10458 sp 00007ffdad37aca0 error 4 in 2.1.243[1b0f458,1953000+3b33000] likely on CPU 4 (core 2, socket 0)
[304847.859198] Code: cc cc 55 48 89 e5 48 89 fe 48 8b 05 82 19 78 03 48 89 f9 48 c1 e9 1d 48 8b 84 c8 80 00 00 00 89 f1 c1 e9 0d 81 e1 f8 ff 00 00 <48> 8b 3c 08 48 85 ff 74 1e 48 8b 07 64 48 33 04 25 00 00 00 00 75
[304953.667141] claude[1613251]: segfault at 0 ip 0000000001d10458 sp 00007ffe1b89fa90 error 4 in 2.1.243[1b0f458,1953000+3b33000] likely on CPU 10 (core 5, socket 0)
[304953.667155] Code: cc cc 55 48 89 e5 48 89 fe 48 8b 05 82 19 78 03 48 89 f9 48 c1 e9 1d 48 8b 84 c8 80 00 00 00 89 f1 c1 e9 0d 81 e1 f8 ff 00 00 <48> 8b 3c 08 48 85 ff 74 1e 48 8b 07 64 48 33 04 25 00 00 00 00 75

the reason is that this version comes with his own free() implementation that doesn't allow to do free(0) or free(NULL) things that are commonly done for instance in __newlocale

mallocs free don't crash with free(0) that case is checked.

#include <stdlib.h>                                                                                                                                            
                                                                                                                                                               
  int main(void) {                                                                                                                                               
    free(0);                                                                                                                                                     
    return 0;                                                                                                                                                    
  }
 ```

confirmed crash on startup, any workaround?

I found I also have still .../claude/versions/2.1.241 on my machine that works I guess

Same issue on cachyOS (also arch) since a few hours.

ok Bun was ported from zig to rust, what make sense that embeds the allocator.

ie this crashes in rust:
std::alloc::dealloc(0 as *mut u8, layout);

Just re-install claude code, version 2.1.245 fixes it!

yeah, fixed, thanks!

<img width="1306" height="418" alt="Image" src="https://github.com/user-attachments/assets/1551ced2-7afe-4615-a2b4-72d6aedecab0" />