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Re: [uml-devel] trinity commit 23dc478aba breaks syscall "mremap" at a 32 bit user mode linux
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From: Richard W. <ri...@no...> - 2014-07-12 18:04:34
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Am 12.07.2014 19:16, schrieb Toralf Förster: > On 05/02/2014 04:14 PM, Richard Weinberger wrote: >> Am 02.05.2014 16:07, schrieb Toralf Förster: >>> On 05/02/2014 09:46 AM, Richard Weinberger wrote: >>>> Am 01.05.2014 23:34, schrieb Toralf Förster: >>>>> On 05/01/2014 10:57 PM, Richard Weinberger wrote: >>>>>> Toralf, >>>>>> >>>>>> Yeah, this is because trinity destroys the UML stub code. >>>>>> Please test the attached patch, it should fix the root cause of the problem. >>>>>> >>>>>> Thanks, >>>>>> //richard >>>>>> >>>>> >>>>> If I do just apply fix2.patch onto latest git tree v3.15-rc3-113-gba6728f then I do get after a while : >>>>> >>>>> * Starting sshd ... [ ok ] >>>>> * Starting local >>>>> net.core.warnings = 0 [ ok ] >>>>> Kernel panic - not syncing: do_syscall_stub : PTRACE_SETREGS failed, errno = 3 >>>>> >>>>> CPU: 0 PID: 1728 Comm: trinity-c0 Not tainted 3.15.0-rc3-00113-gba6728f-dirty #5 >>>>> Stack: >>>>> BUG: soft lockup - CPU#0 stuck for 22s! [trinity-c0:1728] >>>>> >>>>> EIP: c500:[<47c6cf00>] CPU: 0 Not tainted EFLAGS: 476af700 >>>>> Not tainted >>>>> EAX: 47cfc500 EBX: 0a024d00 ECX: 086c75fc EDX: 080fff88 >>>>> ESI: 0839f4bc EDI: 47cfc500 EBP: 0839f4bc DS: c500 ES: cd62 >>>>> EXT4-fs (ubda): error count: 1 >>>>> EXT4-fs (ubda): initial error at 1398962134: ext4_mb_generate_buddy:756 >>>>> EXT4-fs (ubda): last error at 1398962134: ext4_mb_generate_buddy:756 >>>>> >>>>> >>>>> which is a big improvement because before it crashes immediately after few seconds. >>>>> >>>>> After applying both fixes the test case runs w/o a crash till now. >>>> >>>> Can you please also try fix3 (without fix1/2)? >>>> I think I've found the other hidden issue. >>>> So far trinity did not crash my kernel... >>>> >>>> Thanks, >>>> //richard >>>> >>> >>> fix3 made it - till now it runs fine. >>> Of course the syslog of the UML guest is flooded with messages like : >>> >>> May 2 15:45:59 trinity kernel: BUG: Bad rss-counter state mm:47d4d8c0 idx:0 val:2 >>> May 2 15:46:00 trinity kernel: fix_range_common: failed, killing current process: 2983 >>> May 2 15:46:00 trinity kernel: fix_range_common: failed, killing current process: 2984 >>> May 2 15:46:30 trinity kernel: fix_range_common: failed, killing current process: 2986 >>> May 2 15:46:30 trinity kernel: fix_range_common: failed, killing current process: 2989 >>> May 2 15:46:30 trinity kernel: fix_range_common: failed, killing current process: 2991 >>> May 2 15:46:32 trinity kernel: Stub registers - >>> May 2 15:46:32 trinity kernel: 0 - 100000 >>> May 2 15:46:32 trinity kernel: 1 - 1000 >>> May 2 15:46:32 trinity kernel: 2 - 7 >>> May 2 15:46:32 trinity kernel: 3 - 11 >>> May 2 15:46:32 trinity kernel: 4 - 3 >>> May 2 15:46:32 trinity kernel: 5 - 3cbae >>> May 2 15:46:32 trinity kernel: 6 - 100000 >>> May 2 15:46:32 trinity kernel: 7 - 7b >>> May 2 15:46:32 trinity kernel: 8 - 7b >>> May 2 15:46:32 trinity kernel: 9 - 0 >>> May 2 15:46:32 trinity kernel: 10 - 33 >>> May 2 15:46:32 trinity kernel: 11 - ffffffff >>> May 2 15:46:32 trinity kernel: 12 - 100fff >>> May 2 15:46:32 trinity kernel: 13 - 73 >>> May 2 15:46:32 trinity kernel: 14 - 10206 >>> May 2 15:46:32 trinity kernel: 15 - 101028 >>> May 2 15:46:32 trinity kernel: 16 - 7b >>> May 2 15:46:32 trinity kernel: wait_stub_done : failed to wait for SIGTRAP, pid = 483, n = 483, errno = 0, status = 0xb7f >>> May 2 15:46:32 trinity kernel: BUG: Bad rss-counter state mm:47d4d8c0 idx:0 val:1 >>> May 2 15:46:32 trinity kernel: fix_range_common: failed, killing current process: 3000 >>> May 2 15:46:33 trinity kernel: fix_range_common: failed, killing current process: 3002 >>> May 2 15:46:33 trinity kernel: fix_range_common: failed, killing current process: 3004 >>> May 2 15:46:33 trinity kernel: fix_range_common: failed, killing current process: 3006 >>> May 2 15:46:34 trinity kernel: fix_range_common: failed, killing current process: 3009 >>> May 2 15:46:34 trinity kernel: fix_range_common: failed, killing current process: 3010 >>> May 2 15:46:34 trinity kernel: fix_range_common: failed, killing current process: 3012 >>> May 2 15:46:35 trinity kernel: BUG: Bad rss-counter state mm:47d4d8c0 idx:0 val:2 >>> May 2 15:46:35 trinity kernel: fix_range_common: failed, killing current process: 3015 >>> >>> >>> >>> which is expected (right ?) b/c I hammered the UML with the syscall "mremap" by 2 trinity childs for a while. >> >> Yeah. Maybe I find a way to prevent "BUG: Bad rss-counter state mm:47d4d8c0 idx:0 val:1" too. >> >> Thanks for testing! >> //richard >> > /me wonders, if fix3 will make it in mainline ? It will. :) Thanks for the kind reminder... //richard |