======================================
| xx__-> echo $?
| 0
| xx__-> [  274.713538][ T1844] wc (1844) used greatest stack depth: 24216 bytes left
| [  275.499379][ T1351] iperf3 invoked oom-killer: gfp_mask=0xcc0(GFP_KERNEL), order=0, oom_score_adj=0
[  275.500057][ T1351] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  275.500060][ T1351] Call Trace:
[  275.500063][ T1351]  <TASK>
[ 275.500066][ T1351] dump_stack_lvl (lib/dump_stack.c:123) 
[ 275.500079][ T1351] dump_header (mm/oom_kill.c:74 mm/oom_kill.c:468) 
[ 275.500094][ T1351] oom_kill_process (mm/oom_kill.c:1041) 
[ 275.500101][ T1351] out_of_memory (mm/oom_kill.c:1180 (discriminator 4)) 
[ 275.500107][ T1351] ? __pfx_out_of_memory (mm/oom_kill.c:1113) 
[ 275.500123][ T1351] __alloc_pages_may_oom (mm/page_alloc.c:3645) 
[ 275.500132][ T1351] ? __pfx___alloc_pages_may_oom (mm/page_alloc.c:3577) 
[ 275.500153][ T1351] __alloc_pages_slowpath.constprop.0 (mm/page_alloc.c:4433) 
[ 275.500167][ T1351] ? get_page_from_freelist (mm/page_alloc.c:3235 mm/page_alloc.c:3430) 
[ 275.500171][ T1351] ? __pfx___alloc_pages_slowpath.constprop.0 (mm/page_alloc.c:4206) 
[ 275.500190][ T1351] __alloc_frozen_pages_noprof (mm/page_alloc.c:4753) 
[ 275.500195][ T1351] ? __pfx___alloc_frozen_pages_noprof (mm/page_alloc.c:4706) 
[ 275.500200][ T1351] ? __might_fault (mm/memory.c:6839 mm/memory.c:6832) 
[ 275.500212][ T1351] ? trace_kmem_cache_alloc (./include/trace/events/kmem.h:12 (discriminator 21)) 
[ 275.500216][ T1351] ? kmem_cache_alloc_node_noprof (mm/slub.c:4221) 
[ 275.500220][ T1351] ? __create_object (mm/kmemleak.c:766) 
[ 275.500235][ T1351] alloc_pages_mpol (mm/mempolicy.c:2272) 
[ 275.500243][ T1351] ? __pfx_alloc_pages_mpol (mm/mempolicy.c:2227) 
[ 275.500248][ T1351] ? __alloc_skb (./arch/x86/include/asm/atomic.h:28 ./include/linux/atomic/atomic-arch-fallback.h:503 ./include/linux/atomic/atomic-instrumented.h:68 ./include/linux/refcount.h:125 net/core/skbuff.c:692) 
[ 275.500262][ T1351] alloc_pages_noprof (mm/mempolicy.c:2341 mm/mempolicy.c:2361) 
[ 275.500268][ T1351] skb_page_frag_refill (net/core/sock.c:3096 net/core/sock.c:3071) 
[ 275.500277][ T1351] sk_page_frag_refill (net/core/sock.c:3107) 
[ 275.500285][ T1351] tcp_sendmsg_locked (net/ipv4/tcp.c:1206) 
[ 275.500314][ T1351] ? __pfx_tcp_sendmsg_locked (net/ipv4/tcp.c:1061) 
[ 275.500320][ T1351] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:230) 
[ 275.500327][ T1351] ? mark_lock (kernel/locking/lockdep.c:4729 (discriminator 3)) 
[ 275.500336][ T1351] ? mark_held_locks (kernel/locking/lockdep.c:4323) 
[ 275.500348][ T1351] tcp_sendmsg (net/ipv4/tcp.c:1367) 
[ 275.500354][ T1351] sock_write_iter (net/socket.c:712 net/socket.c:727 net/socket.c:1131) 
[ 275.500361][ T1351] ? __pfx_sock_write_iter (net/socket.c:1115) 
[ 275.500380][ T1351] ? find_held_lock (kernel/locking/lockdep.c:5341) 
[ 275.500390][ T1351] vfs_write (fs/read_write.c:586 fs/read_write.c:679) 
[ 275.500398][ T1351] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5816) 
[ 275.500405][ T1351] ? __pfx_vfs_write (fs/read_write.c:660) 
[ 275.500414][ T1351] ? __fget_files (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 fs/file.c:1051) 
[ 275.500438][ T1351] ksys_write (fs/read_write.c:731) 
[ 275.500443][ T1351] ? __pfx_ksys_write (fs/read_write.c:721) 
[ 275.500458][ T1351] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 275.500465][ T1351] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
[  275.500471][ T1351] RIP: 0033:0x7f954a6efbaf
[ 275.500482][ T1351] Code: Unable to access opcode bytes at 0x7f954a6efb85.

Code starting with the faulting instruction
===========================================
[  275.500484][ T1351] RSP: 002b:00007f95445c6cd0 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[  275.500488][ T1351] RAX: ffffffffffffffda RBX: 0000000000020000 RCX: 00007f954a6efbaf
[  275.500490][ T1351] RDX: 0000000000020000 RSI: 00007f9549e53000 RDI: 000000000000001b
[  275.500492][ T1351] RBP: 00007f9549e53000 R08: 0000000000000002 R09: 00007ffc216bff2f
[  275.500494][ T1351] R10: 0000000000000008 R11: 0000000000000246 R12: 000000000000001b


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