[erlang-questions] Death of Erlang VM

[Lev Walkin]

R12B4 fixed at least one bug in Erlang VM which could potentially
lead to VM crashes. I'd advise you to upgrade to R12B4 just in case.

Brian Troutwine wrote:
> Hello all,
> 
> I've encountered a problem, but I'm not really sure what is the
> matter. After running my erlang application for some time I was
> noticed that it had died, though not exited or become a zombie. I run
> it like so:
> 
> $ erl +A 2 +K true -boot aule -config sys.config
> 
> I run a Debian stable AMD64 machine. Here's some information on my environment:
> 
> $ cat /proc/version
> Linux version 2.6.24-19-xen (buildd@REDACTED) (gcc version 4.2.3 (Ubuntu
> 4.2.3-2ubuntu7)) #1 SMP Wed Aug 20 21:08:51 UTC 2008
> $ erl
> Erlang (BEAM) emulator version 5.6.3 [source] [64-bit] [smp:4]
> [async-threads:0] [hipe] [kernel-poll:false]
> 
> What appeared in my syslog follows. I am doing writes to disk with the
> delayed_write flag set. Is there more information that would be
> useful? Here's what appeared in my syslog:
> 
> Sep 18 17:33:05 valinor kernel: [1134774.645406] Unable to handle
> kernel paging request at ffff88001a289008 RIP:
> Sep 18 17:33:05 valinor kernel: [1134774.645421]  [<ffffffff80271fc6>]
> iov_iter_advance+0x66/0x80
> Sep 18 17:33:05 valinor kernel: [1134774.645445] PGD 57f5067 PUD
> 57f6067 PMD 58c8067 PTE 0
> Sep 18 17:33:05 valinor kernel: [1134774.645453] Oops: 0000 [1] SMP
> Sep 18 17:33:05 valinor kernel: [1134774.645458] CPU 3
> Sep 18 17:33:05 valinor kernel: [1134774.645462] Modules linked in:
> ipv6 ext3 jbd mbcache evdev raid10 raid456 async_xor async_memcpy
> async_tx xor raid1 raid0 multipath linear md_mo
> d dm_mirror dm_snapshot dm_mod fuse loop 8250 serial_core
> Sep 18 17:33:05 valinor kernel: [1134774.645492] Pid: 2249, comm:
> beam.smp Not tainted 2.6.24-19-xen #1
> Sep 18 17:33:05 valinor kernel: [1134774.645497] RIP:
> e030:[<ffffffff80271fc6>]  [<ffffffff80271fc6>]
> iov_iter_advance+0x66/0x80
> Sep 18 17:33:05 valinor kernel: [1134774.645504] RSP:
> e02b:ffff8800050c5b10  EFLAGS: 00010246
> Sep 18 17:33:05 valinor kernel: [1134774.645508] RAX: 0000000000000000
> RBX: 0000000000000b2a RCX: 0000000000000000
> Sep 18 17:33:05 valinor kernel: [1134774.645513] RDX: 0000000000000000
> RSI: 0000000000000b2a RDI: ffff8800050c5ba8
> Sep 18 17:33:05 valinor kernel: [1134774.645518] RBP: 0000000000000b2a
> R08: 0000000000000000 R09: 0000000000000000
> Sep 18 17:33:05 valinor kernel: [1134774.645523] R10: ffff88001a289000
> R11: 0000000000000000 R12: 0000000000c09000
> Sep 18 17:33:05 valinor kernel: [1134774.645527] R13: 0000000000001000
> R14: ffff880018895220 R15: 0000000000000000
> Sep 18 17:33:05 valinor kernel: [1134774.645534] FS:
> 00007f74138e0960(0000) GS:ffffffff805c6180(0000)
> knlGS:0000000000000000
> Sep 18 17:33:05 valinor kernel: [1134774.645539] CS:  e033 DS: 0000 ES: 0000
> Sep 18 17:33:05 valinor kernel: [1134774.645542] DR0: 0000000000000000
> DR1: 0000000000000000 DR2: 0000000000000000
> Sep 18 17:33:05 valinor kernel: [1134774.645548] DR3: 0000000000000000
> DR6: 00000000ffff0ff0 DR7: 0000000000000000
> Sep 18 17:33:05 valinor kernel: [1134774.645553] Process beam.smp
> (pid: 2249, threadinfo ffff8800050c4000, task ffff88001ebfa800)
> Sep 18 17:33:05 valinor kernel: [1134774.645558] Stack:
> ffffffff80273f9e ffff88001ecfef00 ffff880012938080 0000000000000000
> Sep 18 17:33:05 valinor kernel: [1134774.645567]  ffff8800050c5db8
> 0000000000bfc427 ffff8800050c5d38 ffff88001ecfef00
> Sep 18 17:33:05 valinor kernel: [1134774.645575]  ffff880018895220
> ffffffff880deac0 ffff880018895110 000000000000cbd9
> Sep 18 17:33:05 valinor kernel: [1134774.645582] Call Trace:
> Sep 18 17:33:05 valinor kernel: [1134774.645588]  [<ffffffff80273f9e>]
> generic_file_buffered_write+0x1de/0x6e0
> Sep 18 17:33:05 valinor kernel: [1134774.645601]  [<ffffffff880ba5ae>]
> :jbd:journal_stop+0x13e/0x1d0
> Sep 18 17:33:05 valinor kernel: [1134774.645608]  [<ffffffff802746ef>]
> __generic_file_aio_write_nolock+0x24f/0x400
> Sep 18 17:33:05 valinor kernel: [1134774.645614]  [<ffffffff80289fb4>]
> find_extend_vma+0x24/0x80
> Sep 18 17:33:05 valinor kernel: [1134774.645622]  [<ffffffff802544e4>]
> unqueue_me+0x54/0xa0
> Sep 18 17:33:05 valinor kernel: [1134774.645628]  [<ffffffff80274904>]
> generic_file_aio_write+0x64/0xd0
> Sep 18 17:33:05 valinor kernel: [1134774.645642]  [<ffffffff880cb663>]
> :ext3:ext3_file_write+0x23/0xc0
> Sep 18 17:33:05 valinor kernel: [1134774.645650]  [<ffffffff880cb640>]
> :ext3:ext3_file_write+0x0/0xc0
> Sep 18 17:33:05 valinor kernel: [1134774.645656]  [<ffffffff8029d6bb>]
> do_sync_readv_writev+0xcb/0x110
> Sep 18 17:33:05 valinor kernel: [1134774.645663]  [<ffffffff80254c5d>]
> futex_wake+0xcd/0xf0
> Sep 18 17:33:05 valinor kernel: [1134774.645668]  [<ffffffff8024cc20>]
> autoremove_wake_function+0x0/0x30
> Sep 18 17:33:05 valinor kernel: [1134774.645675]  [<ffffffff80255bc4>]
> do_futex+0x134/0xc30
> Sep 18 17:33:05 valinor kernel: [1134774.645680]  [<ffffffff8029a30c>]
> __kmalloc+0x13c/0x160
> Sep 18 17:33:05 valinor kernel: [1134774.645686]  [<ffffffff8029de5d>]
> do_readv_writev+0xfd/0x230
> Sep 18 17:33:05 valinor kernel: [1134774.645693]  [<ffffffff80471d07>]
> error_exit+0x0/0x79
> Sep 18 17:33:05 valinor kernel: [1134774.645700]  [<ffffffff8029e4d3>]
> sys_writev+0x53/0xc0
> Sep 18 17:33:05 valinor kernel: [1134774.645706]  [<ffffffff8020c698>]
> system_call+0x68/0x6d
> Sep 18 17:33:05 valinor kernel: [1134774.645711]  [<ffffffff8020c630>]
> system_call+0x0/0x6d
> Sep 18 17:33:05 valinor kernel: [1134774.645716]
> Sep 18 17:33:05 valinor kernel: [1134774.645718]
> Sep 18 17:33:05 valinor kernel: [1134774.645718] Code: 49 8b 52 08 49
> 89 d3 eb c4 4c 89 17 4c 89 4f 10 eb 99 0f 1f
> Sep 18 17:33:05 valinor kernel: [1134774.645739] RIP
> [<ffffffff80271fc6>] iov_iter_advance+0x66/0x80
> Sep 18 17:33:05 valinor kernel: [1134774.645745]  RSP <ffff8800050c5b10>
> Sep 18 17:33:05 valinor kernel: [1134774.645749] CR2: ffff88001a289008
> Sep 18 17:33:05 valinor kernel: [1134774.645762] ---[ end trace
> a91a752e8ec506f8 ]---
>