Re: Crash with CXL + TCG on 8.2: Was Re: qemu cxl memory expander shows numa_node -1

[Jonathan Cameron <Jonathan.Cameron@huawei.com>]

On Thu, 1 Feb 2024 13:12:23 +0000
Peter Maydell <peter.maydell@linaro.org> wrote:

> On Thu, 1 Feb 2024 at 13:04, Jonathan Cameron via <qemu-devel@nongnu.org> wrote:
> >  
> 
> 
> 
> 
> > root@localhost:~/devmem2# numactl --membind=1 touch a
> > qemu: fatal: cpu_io_recompile: could not find TB for pc=(nil)  
> 
> Can you run QEMU under gdb and give the backtrace when it stops
> on the abort() ? That will probably have a helpful clue. I
> suspect something is failing to pass a valid retaddr in
> when it calls a load/store function.
> 
> thanks
> -- PMM

[Switching to Thread 0x7ffff56ff6c0 (LWP 21916)]
__pthread_kill_implementation (no_tid=0, signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:44
44      ./nptl/pthread_kill.c: No such file or directory.
(gdb) bt
#0  __pthread_kill_implementation (no_tid=0, signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:44
#1  __pthread_kill_internal (signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:78
#2  __GI___pthread_kill (threadid=<optimized out>, signo=signo@entry=6) at ./nptl/pthread_kill.c:89
#3  0x00007ffff77c43b6 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
#4  0x00007ffff77aa87c in __GI_abort () at ./stdlib/abort.c:79
#5  0x0000555555c0d4ce in cpu_abort
    (cpu=cpu@entry=0x555556fd9000, fmt=fmt@entry=0x555555fe3378 "cpu_io_recompile: could not find TB for pc=%p")
    at ../../cpu-target.c:359
#6  0x0000555555c59435 in cpu_io_recompile (cpu=cpu@entry=0x555556fd9000, retaddr=retaddr@entry=0) at ../../accel/tcg/translate-all.c:611
#7  0x0000555555c5c956 in io_prepare
    (retaddr=0, addr=19595792376, attrs=..., xlat=<optimized out>, cpu=0x555556fd9000, out_offset=<synthetic pointer>)
    at ../../accel/tcg/cputlb.c:1339
#8  do_ld_mmio_beN
    (cpu=0x555556fd9000, full=0x7fffee0d96e0, ret_be=ret_be@entry=0, addr=19595792376, size=size@entry=8, mmu_idx=4, type=MMU_DATA_LOAD, ra=0) at ../../accel/tcg/cputlb.c:2030
#9  0x0000555555c5dfad in do_ld_8
    (cpu=cpu@entry=0x555556fd9000, p=p@entry=0x7ffff56fddc0, mmu_idx=<optimized out>, type=type@entry=MMU_DATA_LOAD, memop=<optimized out>, ra=ra@entry=0) at ../../accel/tcg/cputlb.c:2356
#10 0x0000555555c6026f in do_ld8_mmu
    (cpu=cpu@entry=0x555556fd9000, addr=addr@entry=19595792376, oi=oi@entry=52, ra=ra@entry=0, access_type=access_type@entry=MMU_DATA_LOAD) at ../../accel/tcg/cputlb.c:2439
#11 0x0000555555c629f9 in cpu_ldq_mmu (ra=0, oi=52, addr=19595792376, env=0x555556fdb7c0) at ../../accel/tcg/ldst_common.c.inc:169
#12 cpu_ldq_le_mmuidx_ra (env=0x555556fdb7c0, addr=19595792376, mmu_idx=<optimized out>, ra=ra@entry=0)
    at ../../accel/tcg/ldst_common.c.inc:301
#13 0x0000555555b18ede in ptw_ldq (in=0x7ffff56fdf00) at ../../target/i386/tcg/sysemu/excp_helper.c:98
#14 ptw_ldq (in=0x7ffff56fdf00) at ../../target/i386/tcg/sysemu/excp_helper.c:93
#15 mmu_translate (env=env@entry=0x555556fdb7c0, in=in@entry=0x7ffff56fdfa0, out=out@entry=0x7ffff56fdf70, err=err@entry=0x7ffff56fdf80)
    at ../../target/i386/tcg/sysemu/excp_helper.c:173
#16 0x0000555555b19c95 in get_physical_address
    (err=0x7ffff56fdf80, out=0x7ffff56fdf70, mmu_idx=0, access_type=MMU_INST_FETCH, addr=18446744072116178925, env=0x555556fdb7c0)
    at ../../target/i386/tcg/sysemu/excp_helper.c:578
#17 x86_cpu_tlb_fill
    (cs=0x555556fd9000, addr=18446744072116178925, size=<optimized out>, access_type=MMU_INST_FETCH, mmu_idx=0, probe=<optimized out>, retaddr=0) at ../../target/i386/tcg/sysemu/excp_helper.c:604
#18 0x0000555555c5dd2b in probe_access_internal
    (cpu=<optimized out>, addr=18446744072116178925, fault_size=fault_size@entry=1, access_type=access_type@entry=MMU_INST_FETCH, mmu_idx=0, nonfault=nonfault@entry=false, phost=0x7ffff56fe0d0, pfull=0x7ffff56fe0c8, retaddr=0, check_mem_cbs=false)
    at ../../accel/tcg/cputlb.c:1432
#19 0x0000555555c61ff8 in get_page_addr_code_hostp (env=<optimized out>, addr=addr@entry=18446744072116178925, hostp=hostp@entry=0x0)
    at ../../accel/tcg/cputlb.c:1603
#20 0x0000555555c50a2b in get_page_addr_code (addr=18446744072116178925, env=<optimized out>)
    at /home/jic23/src/qemu/include/exec/exec-all.h:594
#21 tb_htable_lookup (cpu=<optimized out>, pc=pc@entry=18446744072116178925, cs_base=0, flags=415285936, cflags=4278353920)
    at ../../accel/tcg/cpu-exec.c:231
#22 0x0000555555c50c08 in tb_lookup
    (cpu=cpu@entry=0x555556fd9000, pc=pc@entry=18446744072116178925, cs_base=cs_base@entry=0, flags=<optimized out>, cflags=<optimized out>) at ../../accel/tcg/cpu-exec.c:267
#23 0x0000555555c51e23 in helper_lookup_tb_ptr (env=0x555556fdb7c0) at ../../accel/tcg/cpu-exec.c:423
#24 0x00007fffa9076ead in code_gen_buffer ()
#25 0x0000555555c50fab in cpu_tb_exec (cpu=cpu@entry=0x555556fd9000, itb=<optimized out>, tb_exit=tb_exit@entry=0x7ffff56fe708)
    at ../../accel/tcg/cpu-exec.c:458
#26 0x0000555555c51492 in cpu_loop_exec_tb
    (tb_exit=0x7ffff56fe708, last_tb=<synthetic pointer>, pc=18446744072116179169, tb=<optimized out>, cpu=0x555556fd9000)
    at ../../accel/tcg/cpu-exec.c:920
#27 cpu_exec_loop (cpu=cpu@entry=0x555556fd9000, sc=sc@entry=0x7ffff56fe7a0) at ../../accel/tcg/cpu-exec.c:1041
#28 0x0000555555c51d11 in cpu_exec_setjmp (cpu=cpu@entry=0x555556fd9000, sc=sc@entry=0x7ffff56fe7a0) at ../../accel/tcg/cpu-exec.c:1058
#29 0x0000555555c523b4 in cpu_exec (cpu=cpu@entry=0x555556fd9000) at ../../accel/tcg/cpu-exec.c:1084
#30 0x0000555555c74053 in tcg_cpus_exec (cpu=cpu@entry=0x555556fd9000) at ../../accel/tcg/tcg-accel-ops.c:76
#31 0x0000555555c741a0 in mttcg_cpu_thread_fn (arg=arg@entry=0x555556fd9000) at ../../accel/tcg/tcg-accel-ops-mttcg.c:95
#32 0x0000555555dfb580 in qemu_thread_start (args=0x55555703c3e0) at ../../util/qemu-thread-posix.c:541
#33 0x00007ffff78176ba in start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:444
#34 0x00007ffff78a60d0 in clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81