CVSROOT: /cvs
Module name: src
Changes by: k...@cvs.openbsd.org 2022/02/11 05:06:48
Modified files:
sys/uvm : uvm_map.c
Log message:
Backout previous "Unwire with map lock held" (commitid: eQBvWUwShD91dN9Z)
WITNESS builds broke^W^Wkernels panic on boot as reported by anton and bluhm.
Booting bsd.mp in single-user mode inside VMM shows:
root on sd0a (5f9e458ed30b39ab.a) swap on sd0b dump on sd0b
Enter pathname of shell or RETURN for sh:
witness: lock order reversal:
1st 0xfffffd801f8ce468 vmmaplk (&map->lock)
2nd 0xfffffd801b8162c0 inode (&ip->i_lock)
lock order "&ip->i_lock"(rrwlock) -> "&map->lock"(rwlock) first seen at:
#0 rw_enter_read+0x38
#1 uvmfault_lookup+0x8a
#2 uvm_fault_check+0x32
#3 uvm_fault+0xfb
#4 kpageflttrap+0x12c
#5 kerntrap+0x91
#6 alltraps_kern_meltdown+0x7b
#7 copyout+0x53
#8 ffs_read+0x1f6
#9 VOP_READ+0x41
#10 vn_rdwr+0xa1
#11 vmcmd_map_readvn+0xa0
#12 exec_process_vmcmds+0x88
#13 sys_execve+0x732
#14 start_init+0x26f
#15 proc_trampoline+0x1c
lock order data w1 -> w2 missing
# exit
kernel: protection fault trap, code=0
Stopped at witness_checkorder+0x312: movl 0x10(%r14),%ecx
gkoehler reported faults on poisened addresses on macppc dual G5.
