df5613/t1: claim race -> shared queue -> overflow test
df5613/t1: fd1 inside fwdma_malloc_multiseg after 1 spins (bulkxfer=0xfffff800adf30900 buf=0 OPEN=1)
df5613/t1: fd2 STSTREAM err=0 d2->it=0xfffff800461ca9f0 (fc.it[0]=0xfffff800461ca890)
df5613/t1: fd1 STSTREAM (slow alloc) returned err=0
df5613/t1: final: d1->it=0xfffff800461ca890 d2->it=0xfffff800461ca9f0 shared=no q->buf=0xfffff800461242c8 q->bulkxfer=0xfffff8004616e0a0 bnchunk=2
df5613/t1:   q->bulkxfer[ 8].poffset = 0 (fd1 wrote 512 beyond the 2-entry alloc: ?)
df5613/t1:   q->bulkxfer[ 9].poffset = 0 (fd1 wrote 576 beyond the 2-entry alloc: ?)
df5613/t1:   q->bulkxfer[10].poffset = 0 (fd1 wrote 640 beyond the 2-entry alloc: ?)
df5613/t1:   q->bulkxfer[11].poffset = 0 (fd1 wrote 704 beyond the 2-entry alloc: ?)
df5613/t1:   q->bulkxfer[12].poffset = 0 (fd1 wrote 768 beyond the 2-entry alloc: ?)
df5613/t1:   q->bulkxfer[13].poffset = 0 (fd1 wrote 832 beyond the 2-entry alloc: ?)
df5613/t1:   q->bulkxfer[14].poffset = 0 (fd1 wrote 896 beyond the 2-entry alloc: ?)
df5613/t1:   q->bulkxfer[15].poffset = 0 (fd1 wrote 960 beyond the 2-entry alloc: ?)
df5613/t1:   q->bulkxfer[16].poffset = 0 (fd1 wrote 1024 beyond the 2-entry alloc: ?)
df5613/t1:   q->bulkxfer[17].poffset = 0 (fd1 wrote 1088 beyond the 2-entry alloc: ?)
df5613/t1:   q->bulkxfer[18].poffset = 0 (fd1 wrote 1152 beyond the 2-entry alloc: ?)
df5613/t1:   q->bulkxfer[19].poffset = 0 (fd1 wrote 1216 beyond the 2-entry alloc: ?)
df5613/t1:   q->bulkxfer[20].poffset = 0 (fd1 wrote 1280 beyond the 2-entry alloc: ?)
df5613/t1: 0 of 62 out-of-bounds entries carry fd1's poffset pattern -> heap overflow not confirmed
df5613/t1: fd2 am=0xfffff800461242c8 probe kmalloc(56)=0xfffff80046124300 -> probe differs