======================================
| xx__-> echo $?
| 0
| xx__-> [  759.073398][ T2413] socat (2413) used greatest stack depth: 22864 bytes left
| [  763.572200][ T1179] iperf3 invoked oom-killer: gfp_mask=0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), order=0, oom_score_adj=0
[  763.603445][ T1179] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  763.603449][ T1179] Call Trace:
[  763.603453][ T1179]  <TASK>
[ 763.603460][ T1179] dump_stack_lvl (lib/dump_stack.c:123) 
[ 763.603487][ T1179] dump_header (mm/oom_kill.c:74 mm/oom_kill.c:468) 
[ 763.603516][ T1179] oom_kill_process (mm/oom_kill.c:1041) 
[ 763.603528][ T1179] out_of_memory (mm/oom_kill.c:1180 (discriminator 4)) 
[ 763.603537][ T1179] ? __pfx_out_of_memory (mm/oom_kill.c:1113) 
[ 763.603561][ T1179] __alloc_pages_may_oom (mm/page_alloc.c:3816) 
[ 763.603583][ T1179] ? __pfx___alloc_pages_may_oom (mm/page_alloc.c:3748) 
[ 763.603618][ T1179] __alloc_pages_slowpath.constprop.0 (mm/page_alloc.c:4618) 
[ 763.603639][ T1179] ? get_page_from_freelist (mm/page_alloc.c:3401 mm/page_alloc.c:3601) 
[ 763.603646][ T1179] ? __pfx___alloc_pages_slowpath.constprop.0 (mm/page_alloc.c:4386) 
[ 763.603675][ T1179] __alloc_frozen_pages_noprof (mm/page_alloc.c:4943) 
[ 763.603685][ T1179] ? __pfx___alloc_frozen_pages_noprof (mm/page_alloc.c:4896) 
[ 763.603698][ T1179] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 763.603718][ T1179] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 763.603732][ T1179] ? filemap_get_entry (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 mm/filemap.c:1877) 
[ 763.603751][ T1179] alloc_pages_mpol (mm/mempolicy.c:2303) 
[ 763.603768][ T1179] ? __pfx_alloc_pages_mpol (mm/mempolicy.c:2258) 
[ 763.603782][ T1179] ? down_read (./arch/x86/include/asm/preempt.h:104 kernel/locking/rwsem.c:1255 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526) 
[ 763.603800][ T1179] folio_alloc_noprof (mm/mempolicy.c:2392 mm/mempolicy.c:2402) 
[ 763.603808][ T1179] __filemap_get_folio (mm/filemap.c:1969) 
[ 763.603827][ T1179] filemap_fault (mm/filemap.c:3412) 
[ 763.603844][ T1179] ? __pfx_filemap_map_pages (mm/filemap.c:3691) 
[ 763.603852][ T1179] ? __pfx_filemap_fault (mm/filemap.c:3361) 
[ 763.603858][ T1179] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 763.603867][ T1179] ? do_fault_around (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 mm/memory.c:5479) 
[ 763.603875][ T1179] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 763.603885][ T1179] ? do_fault_around (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 mm/memory.c:5479) 
[ 763.603900][ T1179] __do_fault (mm/memory.c:5098) 
[ 763.603912][ T1179] do_pte_missing (mm/memory.c:5518 mm/memory.c:5652 mm/memory.c:4160) 
[ 763.603924][ T1179] ? rcu_read_unlock (./include/linux/rcupdate.h:341 (discriminator 9) ./include/linux/rcupdate.h:871 (discriminator 9)) 
[ 763.603937][ T1179] handle_pte_fault (mm/memory.c:5997) 
[ 763.603950][ T1179] ? __pfx_handle_pte_fault (mm/memory.c:5954) 
[ 763.603959][ T1179] ? reacquire_held_locks (kernel/locking/lockdep.c:5383) 
[ 763.603964][ T1179] ? do_user_addr_fault (arch/x86/mm/fault.c:1328) 
[ 763.603991][ T1179] __handle_mm_fault (mm/memory.c:6140) 
[ 763.603999][ T1179] ? __pfx___handle_mm_fault (mm/memory.c:6049) 
[ 763.604004][ T1179] ? __lock_release (kernel/locking/lockdep.c:5580) 
[ 763.604037][ T1179] ? __pfx_lock_vma_under_rcu (mm/memory.c:6547) 
[ 763.604051][ T1179] handle_mm_fault (mm/memory.c:6321) 
[ 763.604059][ T1179] ? __pfx_handle_mm_fault (mm/memory.c:6276) 
[ 763.604067][ T1179] ? __pfx___rseq_handle_notify_resume (kernel/rseq.c:425) 
[ 763.604092][ T1179] do_user_addr_fault (arch/x86/mm/fault.c:1338) 
[ 763.604107][ T1179] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 763.604126][ T1179] exc_page_fault (./arch/x86/include/asm/irqflags.h:26 ./arch/x86/include/asm/irqflags.h:109 ./arch/x86/include/asm/irqflags.h:151 arch/x86/mm/fault.c:1488 arch/x86/mm/fault.c:1538) 
[ 763.604141][ T1179] asm_exc_page_fault (./arch/x86/include/asm/idtentry.h:623) 
[  763.604154][ T1179] RIP: 0033:0x7f65db680b0c
[ 763.604175][ T1179] Code: Unable to access opcode bytes at 0x7f65db680ae2.

Code starting with the faulting instruction
===========================================
[  763.604181][ T1179] RSP: 002b:00007f65d542fd20 EFLAGS: 00010246
[  763.604187][ T1179] RAX: 0000000000001680 RBX: 000000000001e374 RCX: 00007f65db680b0c
[  763.604191][ T1179] RDX: 000000000001e374 RSI: 00007f65dacbdc8c RDI: 000000000000001c
[  763.604194][ T1179] RBP: 00007f65dacbdc8c R08: 0000000000000002 R09: 00007ffd46d17a2f
[  763.604197][ T1179] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000020000


Finger prints:
dump_header:oom_kill_process:out_of_memory:__alloc_pages_may_oom:__alloc_frozen_pages_noprof