[info] syscall mremap can't be tested at a UML w/ fuzzy tool trinity

["Toralf Förster" <toralf.foerster@gmx.de>]

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Today I tested if I can activate that syscall again here (munmap works fine since few days).
Testing a 32 bit user mode linux image with "$>trinity -q -N 100000 -C 8" gave in the syslog of the UML guest:

Mar  1 10:09:18 trinity kernel: Stub registers -
Mar  1 10:09:18 trinity kernel:         0 - 100000
Mar  1 10:09:18 trinity kernel:         1 - 2000
Mar  1 10:09:18 trinity kernel:         2 - 0
Mar  1 10:09:18 trinity kernel:         3 - 0
Mar  1 10:09:18 trinity kernel:         4 - 0
Mar  1 10:09:18 trinity kernel:         5 - 0
Mar  1 10:09:18 trinity kernel:         6 - 0
Mar  1 10:09:18 trinity kernel:         7 - 7b
Mar  1 10:09:18 trinity kernel:         8 - 7b
Mar  1 10:09:18 trinity kernel:         9 - 0
Mar  1 10:09:18 trinity kernel:         10 - 33
Mar  1 10:09:18 trinity kernel:         11 - ffffffff
Mar  1 10:09:18 trinity kernel:         12 - 1000c3
Mar  1 10:09:18 trinity kernel:         13 - 73
Mar  1 10:09:18 trinity kernel:         14 - 10206
Mar  1 10:09:18 trinity kernel:         15 - 101028
Mar  1 10:09:18 trinity kernel:         16 - 7b
Mar  1 10:09:18 trinity kernel: wait_stub_done : failed to wait for SIGTRAP, pid = 6662, n = 6662, errno = 0, status = 0xb7f
Mar  1 10:09:18 trinity kernel: do_syscall_stub : ret = 0, offset = 1052680, data = 477be008
Mar  1 10:09:18 trinity kernel: do_syscall_stub: syscall 91 failed, return value = 0x0, expected return value = 0x0
Mar  1 10:09:18 trinity kernel: syscall parameters: 0x100000 0x2000 0x0 0x0 0x0 0x0


and a back trace of the core file of the crashed UML guest process tells:


$ gdb --core=/mnt/ramdisk/core /home/tfoerste/devel/linux/linux -n -batch -ex 'bt'
[New LWP 4841]

warning: Could not load shared library symbols for linux-gate.so.1.
Do you need "set solib-search-path" or "set sysroot"?
Core was generated by `/home/tfoerste/devel/linux/linux earlyprintk ubda=/home/tfoerste/virtual/uml/tr'.
Program terminated with signal 6, Aborted.
#0  0xb77c5424 in __kernel_vsyscall ()
#0  0xb77c5424 in __kernel_vsyscall ()
#1  0x08481b55 in kill ()
#2  0x08072acd in uml_abort () at arch/um/os-Linux/util.c:93
#3  0x08072e05 in os_dump_core () at arch/um/os-Linux/util.c:148
#4  0x080624fd in panic_exit (self=0x86c1598 <panic_exit_notifier>, unused1=0, unused2=0x86f89a0 <buf.16970>) at arch/um/kernel/um_arch.c:240
#5  0x0809a2e6 in notifier_call_chain (nl=0x0, val=0, v=0x86f89a0 <buf.16970>, nr_to_call=-2, nr_calls=0x0) at kernel/notifier.c:93
#6  0x0809a401 in __atomic_notifier_call_chain (nh=0x86f8984 <panic_notifier_list>, val=0, v=0x86f89a0 <buf.16970>, nr_to_call=0, nr_calls=0x0) at kernel/notifier.c:182
#7  0x0809a43f in atomic_notifier_call_chain (nh=0x0, val=0, v=0x0) at kernel/notifier.c:191
#8  0x084de7fc in panic (fmt=0x0) at kernel/panic.c:130
#9  0x080735b5 in do_syscall_stub (addr=<optimized out>, mm_idp=<optimized out>) at arch/um/os-Linux/skas/mem.c:68
#10 run_syscall_stub (mm_idp=0x4755d364, syscall=6, args=0x4490fb60, expected=1150352224, addr=0x4490fda4, done=1) at arch/um/os-Linux/skas/mem.c:142
#11 0x08073c05 in unmap (mm_idp=0x0, addr=1079300096, len=4096, done=1150352224, data=0x4490fb60) at arch/um/os-Linux/skas/mem.c:244
#12 0x08061047 in do_ops (hvc=0x4490fd80, end=1, finished=1) at arch/um/kernel/tlb.c:67
#13 0x080615f8 in fix_range_common (mm=0x0, start_addr=1150352224, end_addr=1079840768, force=0) at arch/um/kernel/tlb.c:281
#14 0x0806193e in fix_range (force=<optimized out>, end_addr=<optimized out>, start_addr=<optimized out>, mm=<optimized out>) at arch/um/kernel/tlb.c:493
#15 flush_tlb_range (vma=0x0, start=1078792192, end=1079840768) at arch/um/kernel/tlb.c:501
#16 0x080ef1ae in move_page_tables (vma=0x47839d48, old_addr=1078792192, new_vma=0x44856cc0, new_addr=2097152, len=1048576, need_rmap_locks=false) at mm/mremap.c:222
#17 0x080ef2c7 in move_vma (vma=0x47839d48, old_addr=1150352224, old_len=6, new_len=1048576, new_addr=1048576, locked=0x0) at mm/mremap.c:269
#18 0x080ef608 in mremap_to (locked=<optimized out>, new_len=<optimized out>, new_addr=<optimized out>, old_len=<optimized out>, addr=<optimized out>) at mm/mremap.c:438
#19 SYSC_mremap (new_addr=<optimized out>, flags=<optimized out>, new_len=<optimized out>, old_len=<optimized out>, addr=<optimized out>) at mm/mremap.c:501
#20 SyS_mremap (addr=1078792192, old_len=1048576, new_len=1048576, flags=3, new_addr=1048576) at mm/mremap.c:470
#21 0x08062ab4 in handle_syscall (r=0x477df0c8) at arch/um/kernel/skas/syscall.c:35
#22 0x08074905 in handle_trap (local_using_sysemu=<optimized out>, regs=<optimized out>, pid=<optimized out>) at arch/um/os-Linux/skas/process.c:198
#23 userspace (regs=0x477df0c8) at arch/um/os-Linux/skas/process.c:431
#24 0x0805f770 in fork_handler () at arch/um/kernel/process.c:149




- -- 
MfG/Sincerely
Toralf Förster
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