On 10/03/2013 09:04 PM, Richard Weinberger wrote: > Am 03.10.2013 20:54, schrieb Toralf Förster: >> On 10/02/2013 09:55 PM, Richard Weinberger wrote: >>> On Wed, Oct 2, 2013 at 8:30 PM, Toralf Förster <toralf.foers...@gmx.de> >>> wrote: >>>> Running trinity (1 process, no victim files, just "$>trinity -C1) for a >>>> longer time >>>> within a 32 bit user mode linux image with a recent git kernel (host: >>>> 3.11.3 guest 3.12-rc3-g...) >>>> yields into this konsole message : >>>> >>>> * Starting local >>>> net.core.warnings = 0 >>>> [ ok ] >>>> BUG: soft lockup - CPU#0 stuck for 23s! [trinity-child0:2031] >>>> >>>> >>>> and at the host t1 of the "linux"-processes eats all CPU cycles at 1 CPU >>>> core. >>>> 2 subsequent made back traces made with >>>> >>>> $> sudo gdb /home/tfoerste/devel/linux/linux 28144 -n -batch -ex bt >>>> >>>> shows nearly a similar position around __get_user_pages() - both are >>>> attached. >>>> >>>> I'm not surprised that trinity harms a systems - I'm just wondering >>>> whether this particular picture is >>>> expected or if it points to an issue. >>>> >>>> >>>> FWIW the last lines of trinity log were : >>>> >>>> >>>> [2031] [94] setsid() = 2031 >>>> [2031] [95] setresgid(rgid=0xffff33e3, egid=0xffffff93, sgid=0x22000040) = >>>> -1 (Operation not permitted) >>>> [2031] [96] vmsplice(fd=5, iov=0x85501e0, nr_segs=300, flags=9) = 0x3000 >>>> [2031] [97] setresuid(ruid=0x80549193, euid=0xc61041e0, suid=0xff19b6fa) = >>>> -1 (Operation not permitted) >>>> [2031] [98] setpriority(which=0xff010000, who=0xf3737373, >>>> niceval=0x8088960c) = -1 (Invalid argument) >>>> [2031] [99] socketcall(call=1, args=0x8550200) = -1 (Address family not >>>> supported by protocol) >>>> [2031] [100] access(filename="�", mode=2017) = -1 (Invalid argument) >>>> [2031] [101] getgroups(gidsetsize=0, grouplist=0x80d0000[page_rand]) = 3 >>>> [2031] [102] msync(start=0xc0100220, len=0, flags=3) = -1 (Invalid >>>> argument) >>>> [2031] [103] sigpending(set=0x40025000) = 0 >>>> [2031] [104] signalfd4(ufd=383, user_mask=1, sizemask=0xa4200000, >>>> flags=0x80800) = -1 (Invalid argument) >>>> [2031] [105] sendfile(out_fd=383, in_fd=382, offset=0, count=4096) = -1 >>>> (Invalid argument) >>>> [2031] [106] fanotify_mark(fanotify_fd=382, flags=5, mask=0x8000023, >>>> dfd=382, pathname="/proc/1092/task/1092/fdinfo/68") = -1 (Invalid argument) >>>> [2031] [107] wait4(upid=1, stat_addr=4, options=0xd761979b, ru=8) = -1 >>>> (Invalid argument) >>>> [2031] [108] sigpending(set=0x80ca000[page_zeros]) = 0 >>>> [2031] [109] setresuid(ruid=0xefffd6fc, euid=0x1bf4c92f, suid=0xffff2e33) >>>> = -1 (Operation not permitted) >>>> [2031] [110] munlock(addr=0x40025000, len=34) = 0 >>>> [2031] [111] timer_delete(timer_id=0xffffffdc) = -1 (Invalid argument) >>>> [2031] [112] sched_get_priority_max(policy=0x10000040) = -1 (Invalid >>>> argument) >>>> [2031] [113] syslog(type=0xc1000000, buf=1, len=0x82a5) = -1 (Operation >>>> not permitted) >>>> [2031] [114] setpriority(which=0xc4c806c6, who=0xffffff01, >>>> niceval=0xffff0682) = -1 (Invalid argument) >>>> [2031] [115] getgroups16(gidsetsize=0xfffe, grouplist=1) = -1 (Bad address) >>>> [2031] [116] rename(oldname=4, newname=8) = -1 (Bad address) >>>> [2031] [117] inotify_init() = 654 >>>> [2031] [118] getgid() = 100 >>>> [2031] [119] fstatat64(dfd=382, >>>> filename="/sys/devices/virtual/net/sit0/duplex", statbuf=0, >>>> flag=0xb545d727) = -1 (Invalid argument) >>>> [2031] [120] unlinkat(dfd=382, >>>> pathname="/proc/sys/net/ipv4/neigh/default/retrans_time", flag=0xc00ef76) >>>> = -1 (Invalid argument) >>>> [2031] [121] timerfd_create(clockid=0, flags=0) = 655 >>>> [2031] [122] munlock(addr=4, len=0x3fff) = -1 (Cannot allocate memory) >>>> [2031] [123] fremovexattr(fd=382, name=0) = -1 (Bad address) >>>> [2031] [124] sched_get_priority_min(policy=0xff58bfef) = -1 (Invalid >>>> argument) >>>> [2031] [125] mq_timedreceive(mqdes=397, u_msg_ptr=4, msg_len=5245, >>>> u_msg_prio=0xc0100220, u_abs_timeout=0xc0100220) = -1 (Bad address) >>>> [2031] [126] chdir(filename="/proc/116/net/ptype") = -1 (Not a directory) >>>> [2031] [127] ssetmask(newmask=0x88000092) = 0 >>>> [2031] [128] statfs(pathname="/proc/6/mounts", buf=0) = -1 (Bad address) >>>> [2031] [129] fchown16(fd=397, user=104, group=0x94100000) = -1 (Operation >>>> not permitted) >>>> [2031] [130] fchdir(fd=397) = -1 (Not a directory) >>>> [2031] [131] mkdir(pathname="/proc/1092/task/1092/fdinfo/316", mode=525) = >>>> -1 (File exists) >>>> [2031] [132] fsetxattr(fd=386, name=0x856f158, value=0x8571160, size=0, >>>> flags=0) = -1 (Numerical result out of range) >>>> [2031] [133] io_setup(nr_events=4095, ctxp=0x40266000) ^CKilled by signal >>>> 2. >>> >>> Reading your gdb backtraces show that schedule_timeout() got called >>> with a negative value. >>> Looks like an integer overflow. >>> The soft-lockup might also origin from that (very big integer which >>> did not overflow jet) >>> >> >> If the culprit is solved by this patch I'd like to send it out. But I'm >> unsure whether it catches the culprit or if it just covers the root cause. > > I fear your Patch will not fix the issue. > > Does the issue only trigger on 32bit UMLs? No diea, I do only have a 32 bit system here (both host and client).
> How long does it take till trinity hits it? a command like $> ssh tfoerste@trinity "rm -rf t3; mkdir t3; cd t3; trinity -C4" usually needs 10 till 15 min to trigger the issue. With just 1 trinity task (-C1) however it needs often a hour or more. > Thanks, > //richard > -- MfG/Sincerely Toralf Förster pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3 ------------------------------------------------------------------------------ October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register > http://pubads.g.doubleclick.net/gampad/clk?id=60134791&iu=/4140/ostg.clktrk _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
