Date: Fri, 6 Nov 2015 13:20:13 +0200 From: Andriy Gapon <avg@FreeBSD.org> To: FreeBSD Current <freebsd-current@FreeBSD.org>, FreeBSD Hackers <freebsd-hackers@FreeBSD.org> Subject: strange kernel crash Message-ID: <563C8CED.3020101@FreeBSD.org>
next in thread | raw e-mail | index | archive | help
Unread portion of the kernel message buffer:
Fatal trap 1: privileged instruction fault while in kernel mode
cpuid = 0; apic id = 00
instruction pointer = 0x20:0xffffffff80619a1e
stack pointer = 0x28:0xfffffe04f57856f0
frame pointer = 0x28:0xfffffe04f57857b0
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 2658 (firefox)
trap number = 1
panic: privileged instruction fault
cpuid = 0
curthread: 0xfffff803270b6000
stack: 0xfffffe04f5782000 - 0xfffffe04f5786000
stack pointer: 0xfffffe04f5785320
KDB: stack backtrace:
db_trace_self_wrapper() at 0xffffffff8041e86b = db_trace_self_wrapper+0x2b/frame
0xfffffe04f5785250
kdb_backtrace() at 0xffffffff80669f39 = kdb_backtrace+0x39/frame 0xfffffe04f5785300
vpanic() at 0xffffffff8063531c = vpanic+0x14c/frame 0xfffffe04f5785340
panic() at 0xffffffff80635063 = panic+0x43/frame 0xfffffe04f57853a0
trap_fatal() at 0xffffffff8081fc0f = trap_fatal+0x33f/frame 0xfffffe04f5785400
trap() at 0xffffffff8081f872 = trap+0x7d2/frame 0xfffffe04f5785610
trap_check() at 0xffffffff8081ff2a = trap_check+0x2a/frame 0xfffffe04f5785630
calltrap() at 0xffffffff80807ea0 = calltrap+0x8/frame 0xfffffe04f5785630
--- trap 0x1, rip = 0xffffffff80619a1e, rsp = 0xfffffe04f5785700, rbp =
0xfffffe04f57857b0 ---
__mtx_lock_flags() at 0xffffffff80619a1e = __mtx_lock_flags+0x2ee/frame
0xfffffe04f57857b0
uma_dbg_getslab() at 0xffffffff807df15c = uma_dbg_getslab+0x3c/frame
0xfffffe04f57857d0
uma_dbg_alloc() at 0xffffffff807df08d = uma_dbg_alloc+0x2d/frame 0xfffffe04f5785800
uma_zalloc_arg() at 0xffffffff807dacf1 = uma_zalloc_arg+0x4b1/frame
0xfffffe04f5785890
uma_zalloc() at 0xffffffff8068b040 = uma_zalloc+0x10/frame 0xfffffe04f57858a0
selfdalloc() at 0xffffffff8068aa12 = selfdalloc+0x22/frame 0xfffffe04f57858c0
pollscan() at 0xffffffff8068a615 = pollscan+0x95/frame 0xfffffe04f5785910
kern_poll() at 0xffffffff8068a4b1 = kern_poll+0x1f1/frame 0xfffffe04f5785a70
sys_poll() at 0xffffffff8068a2b9 = sys_poll+0x79/frame 0xfffffe04f5785a90
syscallenter() at 0xffffffff80820560 = syscallenter+0x320/frame 0xfffffe04f5785b00
amd64_syscall() at 0xffffffff8082012f = amd64_syscall+0x1f/frame 0xfffffe04f5785bf0
Xfast_syscall() at 0xffffffff8080818b = Xfast_syscall+0xfb/frame 0xfffffe04f5785bf0
--- syscall (209, FreeBSD ELF64, sys_poll), rip = 0x80146342a, rsp =
0x7fffffffd8e8, rbp = 0x7fffffffd920 ---
Uptime: 1d12h57m32s
Now the strange part:
0xffffffff80619a18 <+744>: jne 0xffffffff80619a61 <__mtx_lock_flags+817>
0xffffffff80619a1a <+746>: mov %rbx,(%rsp)
=> 0xffffffff80619a1e <+750>: movq $0x0,0x18(%rsp)
0xffffffff80619a27 <+759>: movq $0x0,0x10(%rsp)
0xffffffff80619a30 <+768>: movq $0x0,0x8(%rsp)
RSP value seems to be sane and consistent with the stack information above:
(kgdb) i reg
rax 0x4 4
rbx 0xfffff80126ea54f0 -8791145163536
rcx 0xffffffff8099a600 -2137414144
rdx 0xfffff803270b6000 -8782553063424
rsi 0x4 4
rdi 0xfffff80027f41318 -8795422715112
rbp 0xfffffe04f57857b0 0xfffffe04f57857b0
rsp 0xfffffe04f5785700 0xfffffe04f5785700
r8 0xffffffff809a7727 -2137360601
r9 0xfffff80126ea54f0 -8791145163536
r10 0x3e8 1000
r11 0xfffffe04f5785cc0 -2177725080384
r12 0x1 1
r13 0xfffff803270b6000 -8782553063424
r14 0xfffff80027f41318 -8795422715112
r15 0x0 0
rip 0xffffffff80619a1e 0xffffffff80619a1e <__mtx_lock_flags+750>
eflags 0x10246 [ PF ZF IF RF ]
cs 0x20 32
ss 0x28 40
ds <unavailable>
es <unavailable>
fs <unavailable>
gs <unavailable>
(kgdb) x/a $rsp
0xfffffe04f5785700: 0xfffff80126ea54f0
(kgdb) x/a $rsp + 0x18
0xfffffe04f5785718: 0x0
I have no idea what could have caused the #GP. This is certainly not a stack
overflow.
--
Andriy Gapon
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?563C8CED.3020101>