======================================
| xx__-> echo $?
| 0
| xx__-> [  339.794175][ T2216] grep (2216) used greatest stack depth: 22752 bytes left
| [  340.903241][ T1175] iperf3 invoked oom-killer: gfp_mask=0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), order=0, oom_score_adj=0
[  340.904514][ T1175] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  340.904517][ T1175] Call Trace:
[  340.904520][ T1175]  <TASK>
[ 340.904522][ T1175] dump_stack_lvl (lib/dump_stack.c:123) 
[ 340.904534][ T1175] dump_header (mm/oom_kill.c:74 mm/oom_kill.c:468) 
[ 340.904547][ T1175] oom_kill_process (mm/oom_kill.c:1041) 
[ 340.904553][ T1175] out_of_memory (mm/oom_kill.c:1180 (discriminator 4)) 
[ 340.904559][ T1175] ? __pfx_out_of_memory (mm/oom_kill.c:1113) 
[ 340.904572][ T1175] __alloc_pages_may_oom (mm/page_alloc.c:3820) 
[ 340.904580][ T1175] ? __pfx___alloc_pages_may_oom (mm/page_alloc.c:3752) 
[ 340.904599][ T1175] __alloc_pages_slowpath.constprop.0 (mm/page_alloc.c:4622) 
[ 340.904611][ T1175] ? get_page_from_freelist (mm/page_alloc.c:3405 mm/page_alloc.c:3605) 
[ 340.904616][ T1175] ? __pfx___alloc_pages_slowpath.constprop.0 (mm/page_alloc.c:4390) 
[ 340.904632][ T1175] __alloc_frozen_pages_noprof (mm/page_alloc.c:4947) 
[ 340.904638][ T1175] ? __pfx___alloc_frozen_pages_noprof (mm/page_alloc.c:4900) 
[ 340.904645][ T1175] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 340.904654][ T1175] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 340.904661][ T1175] ? filemap_get_entry (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 mm/filemap.c:1877) 
[ 340.904670][ T1175] alloc_pages_mpol (mm/mempolicy.c:2303) 
[ 340.904679][ T1175] ? __pfx_alloc_pages_mpol (mm/mempolicy.c:2258) 
[ 340.904687][ T1175] ? down_read (./arch/x86/include/asm/preempt.h:104 kernel/locking/rwsem.c:1255 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526) 
[ 340.904697][ T1175] folio_alloc_noprof (mm/mempolicy.c:2392 mm/mempolicy.c:2402) 
[ 340.904701][ T1175] __filemap_get_folio (mm/filemap.c:1969) 
[ 340.904710][ T1175] filemap_fault (mm/filemap.c:3412) 
[ 340.904720][ T1175] ? __pfx_filemap_map_pages (mm/filemap.c:3691) 
[ 340.904725][ T1175] ? __pfx_filemap_fault (mm/filemap.c:3361) 
[ 340.904729][ T1175] ? find_held_lock (kernel/locking/lockdep.c:5348) 
[ 340.904734][ T1175] ? do_fault_around (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 mm/memory.c:5479) 
[ 340.904739][ T1175] ? __lock_release (kernel/locking/lockdep.c:5534) 
[ 340.904746][ T1175] ? do_fault_around (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 mm/memory.c:5479) 
[ 340.904754][ T1175] __do_fault (mm/memory.c:5098) 
[ 340.904760][ T1175] do_pte_missing (mm/memory.c:5518 mm/memory.c:5652 mm/memory.c:4160) 
[ 340.904765][ T1175] ? rcu_read_unlock (./include/linux/rcupdate.h:341 (discriminator 9) ./include/linux/rcupdate.h:871 (discriminator 9)) 
[ 340.904772][ T1175] handle_pte_fault (mm/memory.c:5997) 
[ 340.904779][ T1175] ? __pfx_handle_pte_fault (mm/memory.c:5954) 
[ 340.904785][ T1175] ? reacquire_held_locks (kernel/locking/lockdep.c:5383) 
[ 340.904789][ T1175] ? do_user_addr_fault (arch/x86/mm/fault.c:1328) 
[ 340.904801][ T1175] __handle_mm_fault (mm/memory.c:6140) 
[ 340.904807][ T1175] ? __pfx___handle_mm_fault (mm/memory.c:6049) 
[ 340.904810][ T1175] ? __lock_release (kernel/locking/lockdep.c:5580) 
[ 340.904828][ T1175] ? __pfx_lock_vma_under_rcu (mm/memory.c:6547) 
[ 340.904836][ T1175] handle_mm_fault (mm/memory.c:6321) 
[ 340.904842][ T1175] ? __pfx_handle_mm_fault (mm/memory.c:6276) 
[ 340.904848][ T1175] ? __rseq_handle_notify_resume (kernel/rseq.c:442) 
[ 340.904860][ T1175] do_user_addr_fault (arch/x86/mm/fault.c:1338) 
[ 340.904867][ T1175] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:736) 
[ 340.904877][ T1175] 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) 
[ 340.904883][ T1175] asm_exc_page_fault (./arch/x86/include/asm/idtentry.h:623) 
[  340.904888][ T1175] RIP: 0033:0x7f91a3e0ca20
[ 340.904896][ T1175] Code: Unable to access opcode bytes at 0x7f91a3e0c9f6.

Code starting with the faulting instruction
===========================================
[  340.904898][ T1175] RSP: 002b:00007f919f3fdd50 EFLAGS: 00010206
[  340.904902][ T1175] RAX: 00000000000116e8 RBX: 00000000000190d4 RCX: 00007f91a3d23b0c
[  340.904904][ T1175] RDX: 00000000000190d4 RSI: 00007f91a34edf2c RDI: 0000000000000002
[  340.904906][ T1175] RBP: 00007f91a34edf2c R08: 0000000000000002 R09: 00007ffc33751b1f
[  340.904907][ T1175] R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000020000


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