[ ssic-linux-Bugs-2000692 ] Attempting to build glibc reliably crashes node
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Bugs item #2000692, was opened at 2008-06-23 13:03
Message generated for change (Comment added) made by hughesj
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Category: Process Management
Group: v2.0.0pre1
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: John Hughes (hughesj)
Assigned to: Nobody/Anonymous (nobody)
Summary: Attempting to build glibc reliably crashes node
Initial Comment:
Attempting to build glibc on latest (20/6/2008) kernel from CVS crashes the node:
kernel BUG at fs/exec.c:820!
invalid operand: 0000 [#1]
SMP
Modules linked in: parport_pc parport floppy uhci_hcd ohci_hcd ehci_hcd ide_scsi scsi_mod i2c_piix4 i2c_core dm_snapshot dm_mirror dm_mod ext3 jbd ne2k_pci 8390
CPU: 0
EIP: 0060:[<c01796f4>] Not tainted VLI
EFLAGS: 00000202 (2.6.11-ssi-8k-686-smp)
EIP is at flush_old_exec+0x714/0x760
eax: 00000001 ebx: 00000010 ecx: cf726c00 edx: cf726c18
esi: c4b89290 edi: cf71e680 ebp: c5133e4c esp: c5133df4
ds: 007b es: 007b ss: 0068
Process ld-linux.so.2 (pid: 87475, threadinfo=c5132000 task=c530ccb0)
Stack: c4b89290 00000011 00000000 00000000 cf669a44 c4b8974c 00000001 00000080
c5132000 00000000 00000000 00000000 cc632170 cf669540 ce97a580 cf732e00
00000080 c5133e3c 00000080 ce359aa0 ce359ad8 c0498392 c5133efc c019c116
Call Trace:
[<c01067af>] show_stack+0x7f/0xa0
[<c0106954>] show_registers+0x164/0x230
[<c0106d04>] die+0xf4/0x1c0
[<c0106e56>] do_trap+0x86/0xd0
[<c0107148>] do_invalid_op+0xb8/0xd0
[<c0106413>] error_code+0x2b/0x30
[<c019c116>] load_elf_binary+0x356/0xc70
[<c0179a3e>] search_binary_handler+0x8e/0x260
[<c0179e8a>] ssi_do_execve+0x23a/0x350
[<c0179c3f>] do_execve+0x2f/0x40
[<c0102cd2>] sys_execve+0x42/0xc0
[<c01058ab>] syscall_call+0x7/0xb
Code: c7 49 c0 e8 ef e8 fa ff e9 d5 fd ff ff c7 04 24 48 c7 49 c0 e8 de e8 fa ff e9 99 fd ff ff 0f 0b 94 02 41 ae 49 c0 e9 d5 fe ff ff <0f> 0b 34 03 41 ae 49 c0 e9 5a f9 ff ff 89 34 24 e8 47 6f fb ff
Entering kdb (current=0xc530ccb0, pid 87475) on processor 0 Oops: invalid operand
due to oops @ 0xc01796f4
eax = 0x00000001 ebx = 0x00000010 ecx = 0xcf726c00 edx = 0xcf726c18
esi = 0xc4b89290 edi = 0xcf71e680 esp = 0xc5133df4 eip = 0xc01796f4
ebp = 0xc5133e4c xss = 0x00000068 xcs = 0x00000060 eflags = 0x00000202
xds = 0x0000007b xes = 0x0000007b origeax = 0xffffffff ®s = 0xc5133dc0
[0]kdb>
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>Comment By: John Hughes (hughesj)
Date: 2008-06-24 10:51
Message:
Logged In: YES
user_id=166336
Originator: YES
Here's the code in fs/exec.c where it complains:
/*
* This function makes sure the current process has its own signal table,
* so that flush_signal_handlers can later reset the handlers without
* disturbing other processes. (Other processes might share the signal
* table via the CLONE_SIGHAND option to clone().)
*/
static inline int de_thread(struct task_struct *tsk)
{
[...]
no_thread_group:
BUG_ON(atomic_read(&sig->count) != 1);
exit_itimers(sig);
So it's unhappy that sig->count is not 1, i.e. that the signal struct is
still shared.
----------------------------------------------------------------------
Comment By: John Hughes (hughesj)
Date: 2008-06-23 18:33
Message:
Logged In: YES
user_id=166336
Originator: YES
Ok, it was tst-exec4, not tst-exec3.
To demonstrate the crash, compile the attached tst-exec4.c file with
pthreads then run with some random binary as its argument:
$ cc -pthread tst-exec4.c
$ ./a.out /bin/echo
File Added: tst-exec4.c
----------------------------------------------------------------------
Comment By: John Hughes (hughesj)
Date: 2008-06-23 14:52
Message:
Logged In: YES
user_id=166336
Originator: YES
Ok, just running that test crashes the system. I'll try and package up a
neat testcase.
----------------------------------------------------------------------
Comment By: John Hughes (hughesj)
Date: 2008-06-23 14:47
Message:
Logged In: YES
user_id=166336
Originator: YES
The crash seems to happen as the glibc build process is testing it's
interface to exec:
GCONV_PATH=/usr/local/src/debian/glibc-2.3.6.ds1/build-tree/i386-nptl/iconvdata
LC_ALL=C
/usr/local/src/debian/glibc-2.3.6.ds1/build-tree/i386-nptl/elf/ld-linux.so.2
--library-path
/usr/local/src/debian/glibc-2.3.6.ds1/build-tree/i386-nptl:/usr/local/src/debian/glibc-2.3.6.ds1/build-tree/i386-nptl/math:/usr/local/src/debian/glibc-2.3.6.ds1/build-tree/i386-nptl/elf:/usr/local/src/debian/glibc-2.3.6.ds1/build-tree/i386-nptl/dlfcn:/usr/local/src/debian/glibc-2.3.6.ds1/build-tree/i386-nptl/nss:/usr/local/src/debian/glibc-2.3.6.ds1/build-tree/i386-nptl/nis:/usr/local/src/debian/glibc-2.3.6.ds1/build-tree/i386-nptl/rt:/usr/local/src/debian/glibc-2.3.6.ds1/build-tree/i386-nptl/resolv:/usr/local/src/debian/glibc-2.3.6.ds1/build-tree/i386-nptl/crypt:/usr/local/src/debian/glibc-2.3.6.ds1/build-tree/i386-nptl/nptl
/usr/local/src/debian/glibc-2.3.6.ds1/build-tree/i386-nptl/nptl/tst-exec3
>
/usr/local/src/debian/glibc-2.3.6.ds1/build-tree/i386-nptl/nptl/tst-exec3.out
Or something like that. :-)
----------------------------------------------------------------------
Comment By: John Hughes (hughesj)
Date: 2008-06-23 14:00
Message:
Logged In: YES
user_id=166336
Originator: YES
For interest I've tried this with the old 2.6.10 based kernel, and the
same bug happens (also a "sleeping function called from invalid context"
but I think Roger has fixed that one for 2.6.11).
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