New LOR: lock order reversal: 1st 0xffffff002f7fb270 zfs (zfs) @ /usr/src/sys/kern/vfs_vnops.c:533 2nd 0xffffff80803a26e0 bufwait (bufwait) @ /usr/src/sys/vm/vm_pager.c:311 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2a _witness_debugger() at _witness_debugger+0x2c witness_checkorder() at witness_checkorder+0x66f __lockmgr_args() at __lockmgr_args+0x475 initpbuf() at initpbuf+0xb9 getpbuf() at getpbuf+0xdc swap_pager_getpages() at swap_pager_getpages+0x1aa vm_fault() at vm_fault+0x5f7 trap_pfault() at trap_pfault+0x128 trap() at trap+0x379 calltrap() at calltrap+0x8 --- trap 0xc, rip = 0xffffffff8049497b, rsp = 0xffffff809a427830, rbp = 0xffffff809a4278b0 --- copyout() at copyout+0x3b dmu_read_uio() at dmu_read_uio+0x98 zfs_freebsd_read() at zfs_freebsd_read+0x56f VOP_READ_APV() at VOP_READ_APV+0x44 vn_read() at vn_read+0x149 dofileread() at dofileread+0xa1 kern_readv() at kern_readv+0x60 read() at read+0x55 syscall() at syscall+0x1ac Xfast_syscall() at Xfast_syscall+0xe1 --- syscall (3, FreeBSD ELF64, read), rip = 0x8008ce86c, rsp = 0x7ffffffeb718, rbp = 0x805b41d18 --- Fix: Unknown How-To-Repeat: Unknown
Responsible Changed From-To: freebsd-bugs->freebsd-fs Over to maintainer(s).
Archive followup in -stable: On 2010-Jan-25 11:24:11 +0200, Kostik Belousov <kostikbel@gmail.com> wrote: >On Mon, Jan 25, 2010 at 07:07:00PM +1100, Peter Jeremy wrote: >> I had the following crop up recently in 8-STABLE/amd64 from end of >> November. It's been reported as kern/143184. >Basically, page containing the buffer for read(2) is swapped out. >This causes page fault in copyout(9) and entry into vm subsystem >while zfs vnode lock is held. > >If the buffer is backed by e.g. UFS vnode instead of anonymous >memory, you would get UFS/zfs LOR. > >The problem is generic, I am working on the solution in collaboration >with Peter Holm, basing on the Jeff Roberson idea. -- Peter Jeremy
For bugs matching the following criteria: Status: In Progress Changed: (is less than) 2014-06-01 Reset to default assignee and clear in-progress tags. Mail being skipped