qemu-aarch64-static segfaults python3

Bug #1912790 reported by Santiago Piccinini
8
This bug affects 1 person
Affects Status Importance Assigned to Milestone
QEMU
Undecided
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Bug Description

qemu-aarch64-static is segfaulting in a debian build process using debootstrap.

```
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Reading symbols from /usr/bin/qemu-aarch64-static...
Reading symbols from /usr/lib/debug/.build-id/30/efd3930fb9519b21470b113679376f2ffbb41a.debug...
[New LWP 21817]
[New LWP 21819]

warning: Corrupted shared library list: 0xd5f140 != 0x0
Warning: couldn't activate thread debugging using libthread_db: Cannot find new threads: debugger service failed
Core was generated by `/usr/bin/qemu-aarch64-static /usr/bin/python3.9 -c import imp; print(imp.get_ta'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 have_mmap_lock () at ../../linux-user/mmap.c:43
43 return mmap_lock_count > 0 ? true : false;
[Current thread is 1 (LWP 21817)]
(gdb) bt
#0 have_mmap_lock () at ../../linux-user/mmap.c:43
#1 0x000000000058eb2c in page_set_flags (start=start@entry=4194304, end=end@entry=26451968, flags=flags@entry=8) at ../../accel/tcg/translate-all.c:2568
#2 0x00000000005638cd in target_mmap (start=start@entry=4194304, len=<optimized out>, len@entry=22257160, target_prot=target_prot@entry=0, flags=16434,
    fd=fd@entry=-1, offset=offset@entry=0) at ../../linux-user/mmap.c:602
#3 0x000000000057042d in load_elf_image (image_name=0x7ffff7b7e8d8 "/usr/bin/python3.9", image_fd=3, info=info@entry=0x7ffff7b7ce70,
    pinterp_name=pinterp_name@entry=0x7ffff7b7cbd0, bprm_buf=bprm_buf@entry=0x7ffff7b7d080 "\177ELF\002\001\001") at ../../linux-user/elfload.c:2700
#4 0x0000000000570b9c in load_elf_binary (bprm=bprm@entry=0x7ffff7b7d080, info=info@entry=0x7ffff7b7ce70) at ../../linux-user/elfload.c:3104
#5 0x00000000005c2fdb in loader_exec (fdexec=fdexec@entry=3, filename=<optimized out>, argv=argv@entry=0x2622910, envp=envp@entry=0x2686340,
    regs=regs@entry=0x7ffff7b7cf70, infop=infop@entry=0x7ffff7b7ce70, bprm=<optimized out>) at ../../linux-user/linuxload.c:147
#6 0x00000000004027f7 in main (argc=<optimized out>, argv=0x7ffff7b7d638, envp=<optimized out>) at ../../linux-user/main.c:810

(gdb) i r
rax 0x0 0
rbx 0x400000 4194304
rcx 0x7a95d2 8033746
rdx 0x8 8
rsi 0x193a000 26451968
rdi 0x400000 4194304
rbp 0x400000 0x400000
rsp 0x7ffff7b7c978 0x7ffff7b7c978
r8 0xffffffff 4294967295
r9 0x0 0
r10 0x4032 16434
r11 0x206 518
r12 0x193a000 26451968
r13 0x8 8
r14 0x8 8
r15 0x193a000 26451968
rip 0x562f20 0x562f20 <have_mmap_lock>
eflags 0x10206 [ PF IF RF ]
cs 0x33 51
ss 0x2b 43
ds 0x0 0
es 0x0 0
fs 0x0 0
gs 0x0 0

```

Python3.9 is run as part of the installation of python3-minimal and the segfaults happens reliably here. Debian versionn bullseye (testing)

Version: qemu-aarch64 version 5.2.0 (Debian 1:5.2+dfsg-3)

Host is a qemu-system-x86_64: Linux runner 4.19.0-13-amd64 #1 SMP Debian 4.19.160-2 (2020-11-28) x86_64 GNU/Linux.

Revision history for this message
Santiago Piccinini (spiccinini) wrote :
summary: - qemu-aarch64-static segfaults ldconfig
+ qemu-aarch64-static segfaults python3
tags: added: linux-user tcg
Revision history for this message
Santiago Piccinini (spiccinini) wrote :

Sorry, disregard this report. The qemu version actually running was an old version that had this bug (in debian 10). The 5.2 version does not have this issue.
I was confused by binfmt + docker.

Changed in qemu:
status: New → Invalid
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