Hi,
had recently this panic during some I/O stress tests:
> $<msgbuf
[...]
panic[cpu1]/thread=fffffe80005c3c80:
BAD TRAP: type=e (#pf Page fault) rp=fffffe80005c3980 addr=30 occurred in
module "zfs" due to a NULL pointer dereference
sched:
#pf Page fault
Bad kernel fault at addr=0x30
pid=0, pc=0xfffffffff3ee322e, sp=0xfffffe80005c3a70, eflags=0x10206
cr0: 8005003b<pg,wp,ne,et,ts,mp,pe> cr4: 6f0<xmme,fxsr,pge,mce,pae,pse>
cr2: 30 cr3: a49a000 cr8: c
rdi: fffffe80f0aa2b40 rsi: ffffffff89c3a050 rdx: 6352
rcx: 2f r8: 0 r9: 30
rax: 64f2 rbx: 20000 rbp: fffffe80005c3aa0
r10: fffffe80f0c979 r11: bd7189449a7087 r12: ffffffff89c3a040
r13: ffffffff89c3a040 r14: 32790 r15: 0
fsb: ffffffff80000000 gsb: ffffffff8149d800 ds: 43
es: 43 fs: 0 gs: 1c3
trp: e err: 0 rip: fffffffff3ee322e
cs: 28 rfl: 10206 rsp: fffffe80005c3a70
ss: 30
fffffe80005c3870 unix:die+eb ()
fffffe80005c3970 unix:trap+14f9 ()
fffffe80005c3980 unix:cmntrap+140 ()
fffffe80005c3aa0 zfs:buf_hash_remove+54 ()
fffffe80005c3b00 zfs:arc_change_state+1bd ()
fffffe80005c3b70 zfs:arc_evict_ghost+d1 ()
fffffe80005c3b90 zfs:arc_adjust+10f ()
fffffe80005c3bb0 zfs:arc_kmem_reclaim+d0 ()
fffffe80005c3bf0 zfs:arc_kmem_reap_now+30 ()
fffffe80005c3c60 zfs:arc_reclaim_thread+108 ()
fffffe80005c3c70 unix:thread_start+8 ()
syncing file systems...
done
dumping to /dev/md/dsk/swap, offset 644874240, content: kernel
> $c
buf_hash_remove+0x54(ffffffff89c3a040)
arc_change_state+0x1bd(ffffffffc0099370, ffffffff89c3a040, ffffffffc0098f30)
arc_evict_ghost+0xd1(ffffffffc0099470, 14b5c0c4)
arc_adjust+0x10f()
arc_kmem_reclaim+0xd0()
arc_kmem_reap_now+0x30(0)
arc_reclaim_thread+0x108()
thread_start+8()
> ::status
debugging crash dump vmcore.0 (64-bit) from server
operating system: 5.11 snv_39 (i86pc)
panic message:
BAD TRAP: type=e (#pf Page fault) rp=fffffe80005c3980 addr=30 occurred in
module "zfs" due to a NULL pointer dereference
dump content: kernel pages only
Daniel
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