https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235489
Bug ID: 235489
Summary: llan driver causes fatal kernel trap: 0x300 (data
storage interrupt) when system is low on memory
Product: Base System
Version: CURRENT
Hardware: powerpc
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: lup...@freebsd.org
When running several builders in parallel, on QEMU, with 8GB of memory, a fatal
kernel trap caused by llan driver is sometimes observed, when the system starts
to run out of swap space.
fatal kernel trap:
exception = 0x300 (data storage interrupt)
virtual address = 0x18
dsisr = 0x42000000
srr0 = 0xc000000000ac9104 (0xac9104)
srr1 = 0x8000000000009032
current msr = 0x8000000000009032
lr = 0xc000000000ac90ec (0xac90ec)
curthread = 0xc000000006deb000
pid = 12, comm = irq16781321: llan0
panic: data storage interrupt trap
cpuid = 2
time = 1549288422
KDB: stack backtrace:
0xe0000000005a5ed0: at .kdb_backtrace+0x5c
0xe0000000005a6000: at .vpanic+0x1b4
0xe0000000005a60c0: at .panic+0x38
0xe0000000005a6150: at .trap_fatal+0x25c
0xe0000000005a61e0: at .trap+0xeec
0xe0000000005a6380: at .powerpc_interrupt+0x290
0xe0000000005a6420: kernel DSI write trap @ 0x18 by .llan_intr+0xf4:
srr1=0x8000000000009032
r1=0xe0000000005a66d0 cr=0x22000042 xer=0 ctr=0
r2=0xc000000001569528 sr=0x42000000
0xe0000000005a66d0: at .llan_intr+0xd8
0xe0000000005a6770: at .ithread_loop+0x25c
0xe0000000005a6850: at .fork_exit+0xd0
0xe0000000005a68f0: at .fork_trampoline+0x10
0xe0000000005a6920: at -0x4
KDB: enter: panic
[ thread pid 12 tid 100153 ]
Stopped at .kdb_enter+0x60: ld r2, r1, 0x28
db>
It seems like there is some point in the driver that does not check properly if
UMA allocation failed.
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