[Bug 1895080] [NEW] pgb_reserved_va: Assertion `addr == test' failed

[Hansni Bu]

Public bug reported:

This problem occurs on CentOS-7.5 (64-bit) with qemu-5.1.0, qemu head
(commit 9435a8b3dd35f1f926f1b9127e8a906217a5518a) for riscv32-linux-
user.

Firstly, compile fails:
Compiling C object libqemu-riscv32-linux-user.fa.p/linux-user_strace.c.o
../qemu.git/linux-user/strace.c:1210:18: error: ‘FALLOC_FL_KEEP_SIZE’ 
undeclared here (not in a function)
     FLAG_GENERIC(FALLOC_FL_KEEP_SIZE),

I have to add below include to linux-user/strace.c
diff --git a/linux-user/strace.c b/linux-user/strace.c
index 11fea14fba..22e51d4a8a 100644
--- a/linux-user/strace.c
+++ b/linux-user/strace.c
@@ -7,6 +7,7 @@
 #include <sys/mount.h>
 #include <arpa/inet.h>
 #include <netinet/tcp.h>
+#include <linux/falloc.h>
 #include <linux/if_packet.h>
 #include <linux/netlink.h>
 #include <sched.h>

Then trying qemu-riscv32 with a simple ELF, I get:
linux-user/elfload.c:2341: pgb_reserved_va: Assertion `addr == test' failed.

strace shows that:
mmap(0x1000, 4294963200, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, 
-1, 0) = 0x10000
write(2, "qemu-riscv32: ../qemu.git/linux-"..., 103qemu-riscv32: 
../qemu.git/linux-user/elfload.c:2341: pgb_reserved_va: Assertion `addr == 
test' failed.
) = 103

The source code is in the function pgb_reserved_va (linux-
user/elfload.c). I think mmap cannot guarantee that the returned pointer
(test) equals to the parameter of addr. So is this a bug to assert (addr
== test)?

Attached configure script and test ELF file.

Thanks.

** Affects: qemu
     Importance: Undecided
         Status: New

** Attachment added: "config script and test ELF file"
   
https://bugs.launchpad.net/bugs/1895080/+attachment/5409254/+files/config_and_elf.tar.xz

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https://bugs.launchpad.net/bugs/1895080

Title:
  pgb_reserved_va: Assertion `addr == test' failed

Status in QEMU:
  New

Bug description:
  This problem occurs on CentOS-7.5 (64-bit) with qemu-5.1.0, qemu head
  (commit 9435a8b3dd35f1f926f1b9127e8a906217a5518a) for riscv32-linux-
  user.

  Firstly, compile fails:
  Compiling C object libqemu-riscv32-linux-user.fa.p/linux-user_strace.c.o
  ../qemu.git/linux-user/strace.c:1210:18: error: ‘FALLOC_FL_KEEP_SIZE’ 
undeclared here (not in a function)
       FLAG_GENERIC(FALLOC_FL_KEEP_SIZE),

  I have to add below include to linux-user/strace.c
  diff --git a/linux-user/strace.c b/linux-user/strace.c
  index 11fea14fba..22e51d4a8a 100644
  --- a/linux-user/strace.c
  +++ b/linux-user/strace.c
  @@ -7,6 +7,7 @@
   #include <sys/mount.h>
   #include <arpa/inet.h>
   #include <netinet/tcp.h>
  +#include <linux/falloc.h>
   #include <linux/if_packet.h>
   #include <linux/netlink.h>
   #include <sched.h>

  Then trying qemu-riscv32 with a simple ELF, I get:
  linux-user/elfload.c:2341: pgb_reserved_va: Assertion `addr == test' failed.

  strace shows that:
  mmap(0x1000, 4294963200, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, 
-1, 0) = 0x10000
  write(2, "qemu-riscv32: ../qemu.git/linux-"..., 103qemu-riscv32: 
../qemu.git/linux-user/elfload.c:2341: pgb_reserved_va: Assertion `addr == 
test' failed.
  ) = 103

  The source code is in the function pgb_reserved_va (linux-
  user/elfload.c). I think mmap cannot guarantee that the returned
  pointer (test) equals to the parameter of addr. So is this a bug to
  assert (addr == test)?

  Attached configure script and test ELF file.

  Thanks.

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