Re: lock order reversal and poudriere

On 02/05/2020 10:08, Grzegorz Junka wrote:
> I am compiling some packages with poudriere on 13-current kernel. I 
> noticed some strange messages printed into the terminal and dmesg:
>
> lock order reversal:
>  1st 0xfffff8010ca78250 zfs (zfs) _at_ /usr/src-13/sys/kern/vfs_mount.c:1005
>  2nd 0xfffff8010cd37250 devfs (devfs) _at_ 
> /usr/src-13/sys/kern/vfs_mount.c:1016
> stack backtrace:
> #0 0xffffffff80c2d5f1 at witness_debugger+0x71
> #1 0xffffffff80b92f18 at lockmgr_lock_flags+0x188
> #2 0xffffffff80cae744 at _vn_lock+0x54
> #3 0xffffffff80c90756 at vfs_domount+0xd16
> #4 0xffffffff80c8efd1 at vfs_donmount+0x871
> #5 0xffffffff80c8e729 at sys_nmount+0x69
> #6 0xffffffff81060c40 at amd64_syscall+0x140
> #7 0xffffffff810370a0 at fast_syscall_common+0x101
> pid 17216 (conftest), jid 6, uid 0: exited on signal 11
> pid 51159 (conftest), jid 6, uid 0: exited on signal 11
> pid 23833 (conftest), jid 3, uid 0: exited on signal 11
> pid 4916 (conftest), jid 3, uid 0: exited on signal 11
>
> (... then there is a bunch of similar ones, then ...)
>
> pid 14504 (conftest), jid 3, uid 0: exited on signal 11
> pid 27466 (conftest), jid 6, uid 0: exited on signal 11
> pid 43297 (conftest), jid 5, uid 0: exited on signal 11
> lock order reversal:
>  1st 0xfffffe00bc68c030 filedesc structure (filedesc structure) _at_ 
> /usr/src-13/sys/kern/sys_generic.c:1557
>  2nd 0xfffff803baeddbd8 tmpfs (tmpfs) _at_ 
> /usr/src-13/sys/kern/vfs_vnops.c:1553
> stack backtrace:
> #0 0xffffffff80c2d5f1 at witness_debugger+0x71
> #1 0xffffffff80b946b5 at lockmgr_xlock+0x55
> #2 0xffffffff80cae744 at _vn_lock+0x54
> #3 0xffffffff80cad0da at vn_poll+0x3a
> #4 0xffffffff80c33e19 at kern_poll+0x419
> #5 0xffffffff80c340df at sys_ppoll+0x6f
> #6 0xffffffff81060c40 at amd64_syscall+0x140
> #7 0xffffffff810370a0 at fast_syscall_common+0x101
> pid 37533 (conftest), jid 5, uid 0: exited on signal 11
> pid 43474 (conftest), jid 5, uid 0: exited on signal 11
>
>

I restarted the compilation and again seeing similar LORs:

lock order reversal:
  1st 0xfffff80115d32068 zfs (zfs) _at_ /usr/src-13/sys/kern/vfs_mount.c:1005
  2nd 0xfffff800243d6808 devfs (devfs) _at_ 
/usr/src-13/sys/kern/vfs_mount.c:1016
stack backtrace:
#0 0xffffffff80c2d5f1 at witness_debugger+0x71
#1 0xffffffff80b92f18 at lockmgr_lock_flags+0x188
#2 0xffffffff80cae744 at _vn_lock+0x54
#3 0xffffffff80c90756 at vfs_domount+0xd16
#4 0xffffffff80c8efd1 at vfs_donmount+0x871
#5 0xffffffff80c8e729 at sys_nmount+0x69
#6 0xffffffff81060c40 at amd64_syscall+0x140
#7 0xffffffff810370a0 at fast_syscall_common+0x101

lock order reversal:
  1st 0xfffffe00a7aa49b0 filedesc structure (filedesc structure) _at_ 
/usr/src-13/sys/kern/sys_generic.c:1557
  2nd 0xfffff800aa2cdbd8 zfs (zfs) _at_ /usr/src-13/sys/kern/vfs_vnops.c:1553
stack backtrace:
#0 0xffffffff80c2d5f1 at witness_debugger+0x71
#1 0xffffffff80b946b5 at lockmgr_xlock+0x55
#2 0xffffffff80cae744 at _vn_lock+0x54
#3 0xffffffff80cad0da at vn_poll+0x3a
#4 0xffffffff80c33e19 at kern_poll+0x419
#5 0xffffffff80c339f0 at sys_poll+0x50
#6 0xffffffff81060c40 at amd64_syscall+0x140
#7 0xffffffff810370a0 at fast_syscall_common+0x101


The page to report still returns 404 :)

--

GrzegorzJ