Date: Sun, 25 Feb 2018 23:18:45 -0600 From: Jon Brawn <jon@brawn.org> To: FreeBSD current <freebsd-current@freebsd.org> Subject: lock order reversal Message-ID: <BE3A3E69-9C95-4F60-B3F6-1035183E4215@brawn.org>
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--Apple-Mail=_30593960-CB93-4397-8A20-5CAC20A9FD35 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Wotcha! So, I=E2=80=99ve been using FreeBSD 12-CURRENT at various svn releases = for a while now, and I get quite a few =E2=80=9Clock order reversal=E2=80=9D= dumps. The one I=E2=80=99ve got on my screen at the moment is for ufs / = bufwait / ufs: root@brax:/usr/src/stand # lock order reversal: 1st 0xfffffd0003ec17e8 ufs (ufs) @ /usr/src/sys/kern/vfs_subr.c:2602 2nd 0xffff0000410efa20 bufwait (bufwait) @ = /usr/src/sys/ufs/ffs/ffs_vnops.c:282 3rd 0xfffffd00b83ca7e8 ufs (ufs) @ /usr/src/sys/kern/vfs_subr.c:2602 stack backtrace: #0 0xffff0000003b59d4 at witness_debugger+0x64 #1 0xffff00000032bd34 at __lockmgr_args+0x6ac #2 0xffff0000005c6af0 at ffs_lock+0x88 #3 0xffff000000679eb0 at VOP_LOCK1_APV+0xac #4 0xffff000000426fa8 at _vn_lock+0x64 #5 0xffff000000417550 at vget+0x78 #6 0xffff000000409fdc at vfs_hash_get+0xec #7 0xffff0000005c2b94 at ffs_vgetf+0x44 #8 0xffff0000005b96a8 at softdep_sync_buf+0x9f4 #9 0xffff0000005c7834 at ffs_syncvnode+0x26c #10 0xffff0000005a1b5c at ffs_truncate+0x6b0 #11 0xffff0000005ce3cc at ufs_direnter+0x778 #12 0xffff0000005d64bc at ufs_makeinode+0x4b8 #13 0xffff0000005d2b90 at ufs_create+0x38 #14 0xffff000000677168 at VOP_CREATE_APV+0xac #15 0xffff00000042691c at vn_open_cred+0x264 #16 0xffff00000041fc84 at kern_openat+0x208 #17 0xffff00000064b59c at do_el0_sync+0x8bc Is there something I should be doing to help debug these? Jon.= --Apple-Mail=_30593960-CB93-4397-8A20-5CAC20A9FD35 Content-Disposition: attachment; filename=smime.p7s Content-Type: application/pkcs7-signature; name=smime.p7s Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIILEzCCBSUw ggQNoAMCAQICECQcc6QQWc3Um5HgAnmjhBYwDQYJKoZIhvcNAQELBQAwgZcxCzAJBgNVBAYTAkdC MRswGQYDVQQIExJHcmVhdGVyIE1hbmNoZXN0ZXIxEDAOBgNVBAcTB1NhbGZvcmQxGjAYBgNVBAoT EUNPTU9ETyBDQSBMaW1pdGVkMT0wOwYDVQQDEzRDT01PRE8gUlNBIENsaWVudCBBdXRoZW50aWNh dGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMB4XDTE3MTAyODAwMDAwMFoXDTE4MTAyODIzNTk1OVow HjEcMBoGCSqGSIb3DQEJARYNam9uQGJyYXduLm9yZzCCASIwDQYJKoZIhvcNAQEBBQADggEPADCC AQoCggEBALEscuT73gkjXEfkaQU3QXOOIDFilHr9RV/FKPk+ZO3wyXpoChqRW+anE+kKBLSCsmoX 6HnhAmcq3j9umj5jIYwpD84m26XbWQK+uo42GZ3cAF12VvO0g/toUvI+nJcxiD39APWowPKQ4Nae 4FN4hLOcwd2zyF3LiJgq4aXXcBQxl2s1JRCb7STFl5qpp73JVbFp1MkABmESyzI6KE0LLH3hHICU d2m+Omg6L8T+RgsTEKmgTvw1hYD04ms9ttji/viI8LtR3V9p9DDGH0iSCF56kPo4WfsbfGVBs1km 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