>Number: 42205
>Category: kern
>Synopsis: kernel panic at activated userquota
>Confidential: no
>Severity: serious
>Priority: high
>Responsible: kern-bug-people
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Tue Oct 20 16:10:00 +0000 2009
>Originator: Uwe Toenjes
>Release: NetBSD 5.0_STABLE
>Organization:
University of Leipzig
>Environment:
NetBSD 6bone.informatik.uni-leipzig.de 5.0_STABLE NetBSD 5.0_STABLE (MYCONF)
#0: Fri Oct 16 11:16:05 CEST 2009
root%6bone.informatik.uni-leipzig.de@localhost:/usr/obj/sys/arch/amd64/compile/MYCONF
amd64
>Description:
at high i/o a kernel panic can occur if you are using quota. without userquota
everything works fine.
uvm_fault(0xffffffff80c79620, 0x0, 1) -> e
fatal page fault in supervisor mode
trap type 6 code 0 rip ffffffff803e46b3 cs 8 rflags 10246 cr2 70 cpl 0 rsp fff0
kernel: page fault trap, code=0
Stopped in pid 0.61 (system) at netbsd:qsync+0x103: movq 0x70(%rdx,%rax,8
),%r14
db{0}> trace
qsync() at netbsd:qsync+0x103
ffs_sync() at netbsd:ffs_sync+0x2eb
VFS_SYNC() at netbsd:VFS_SYNC+0x33
sync_fsync() at netbsd:sync_fsync+0x85
VOP_FSYNC() at netbsd:VOP_FSYNC+0x71
sched_sync() at netbsd:sched_sync+0x15d
db{0}> show registers
ds 0xfd28
es 0x60a3
fs 0xaac0
gs 0x12
rdi 0xffff80007d9cfd28
rsi 0
rbp 0xffff80007282ab20
rbx 0xffff80007d9cfd28
rdx 0
rcx 0
rax 0
r8 0x7000000
r9 0x420
r10 0x2c0e57
r11 0x1
r12 0xffff8000728164a0
r13 0xffff80008f4be758
r14 0
r15 0xffff800087f56f28
rip 0xffffffff803e46b3 qsync+0x103
cs 0x8
rflags 0x10246
rsp 0xffff80007282aaf0
ss 0
netbsd:qsync+0x103: movq 0x70(%rdx,%rax,8),%r14
db{0}> continue
uvm_fault(0xffffffff80c79620, 0x0, 1) -> e
fatal page fault in supervisor mode
trap type 6 code 0 rip ffffffff803e46b3 cs 8 rflags 10246 cr2 70 cpl 0 rsp fff0
kernel: page fault trap, code=0
Stopped in pid 0.61 (system) at netbsd:qsync+0x103: movq 0x70(%rdx,%rax,8
),%r14
db{0}> continue
uvm_fault(0xffffffff80c79620, 0x0, 1) -> e
fatal page fault in supervisor mode
trap type 6 code 0 rip ffffffff803e46b3 cs 8 rflags 10246 cr2 70 cpl 0 rsp fff0
kernel: page fault trap, code=0
Stopped in pid 0.61 (system) at netbsd:qsync+0x103: movq 0x70(%rdx,%rax,8
),%r14
>How-To-Repeat:
the panic occurs only by chance at high disk i/o with enabled userquota.
>Fix: