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 -- To unsubscribe from this list: send the line "unsubscribe trinity" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
