linux-kernel - Re: [PATCH -tip ] [BUGFIX] kprobes: Move hash

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Message-ID: <847glb8m4i.fsf@sauna.l.org>
Date:	Wed, 13 Mar 2013 15:28:29 +0200
From:	Timo Juhani Lindfors <timo.lindfors@....fi>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Nadia Yvette Chambers <nyc@...omorphy.com>,
	yrl.pp-manager.tt@...achi.com,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH -tip ] [BUGFIX] kprobes: Move hash_64() into .text.kprobe section

Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> writes:
> OK, then I'll update it to just use __always_inline.

I get a similar case of infinite recursion if I try to kprobe
"inat_get_opcode_attribute":

PID: 3028   TASK: ffff88003c67e8c0  CPU: 1   COMMAND: "insmod"
 #0 [ffff88003d60b9b8] __schedule at ffffffff813777f8
 #1 [ffff88003d60b9d0] inat_get_opcode_attribute at ffffffff811c95a9
 #2 [ffff88003d60b9e0] notifier_call_chain at ffffffff8137b5a3
 #3 [ffff88003d60ba20] notify_die at ffffffff8137b60c
 #4 [ffff88003d60ba50] do_int3 at ffffffff81378fa0
 #5 [ffff88003d60ba70] xen_int3 at ffffffff8137887e
    [exception RIP: inat_get_opcode_attribute+1]
    RIP: ffffffff811c95a9  RSP: ffff88003d60bb20  RFLAGS: 00000006
    RAX: 0000000000000200  RBX: ffffffffa00070f0  RCX: 00000000ffffffff
    RDX: ffff88003f80dd90  RSI: ffff88003d60bcc8  RDI: 0000000000000040
    RBP: ffffffffa019b000   R8: 0000000000000000   R9: ffffffff81629b10
    R10: 00000000000066a8  R11: ffffffffa019b000  R12: ffff88003f80dd90
    R13: ffffffff811c95a8  R14: ffffffff811c95a9  R15: ffffffffa019b010
    ORIG_RAX: ffffffffffffffff  CS: 10000e030  SS: e02b
 #6 [ffff88003d60bb20] skip_prefixes at ffffffff81379b6e
 #7 [ffff88003d60bb30] set_current_kprobe.isra.4 at ffffffff81379bb0
 #8 [ffff88003d60bb40] kprobe_exceptions_notify at ffffffff8137a446
 #9 [ffff88003d60bba0] notifier_call_chain at ffffffff8137b5a3
#10 [ffff88003d60bbe0] notify_die at ffffffff8137b60c
#11 [ffff88003d60bc10] do_int3 at ffffffff81378fa0
#12 [ffff88003d60bc30] xen_int3 at ffffffff8137887e
    [exception RIP: inat_get_opcode_attribute+1]
    RIP: ffffffff811c95a9  RSP: ffff88003d60bce0  RFLAGS: 00000246
    RAX: 0000000000000001  RBX: ffff88003d60bdb0  RCX: 0000000000000000
    RDX: ffff88003d60be10  RSI: ffff88003d60be10  RDI: 0000000000000040
    RBP: 0000000000000000   R8: ffff88003d60bdb0   R9: ffffffff811c95a8
    R10: 00000000000066a8  R11: ffffffffa019b000  R12: ffffffff811c9540
    R13: ffffffff811c95ad  R14: 0000000000000000  R15: ffffffffa019b010
    ORIG_RAX: ffffffffffffffff  CS: e030  SS: e02b
#13 [ffff88003d60bce0] insn_get_prefixes at ffffffff811c9721
#14 [ffff88003d60bd10] insn_get_opcode at ffffffff811c9923
#15 [ffff88003d60bd30] insn_get_modrm at ffffffff811c9a2e
#16 [ffff88003d60bd50] insn_get_sib at ffffffff811c9af8
#17 [ffff88003d60bd60] insn_get_displacement at ffffffff811c9b5d
#18 [ffff88003d60bd70] insn_get_immediate at ffffffff811c9c48
#19 [ffff88003d60bd80] insn_get_length at ffffffff811c9f97
#20 [ffff88003d60bd90] can_optimize at ffffffff8137a96e
#21 [ffff88003d60be50] arch_prepare_optimized_kprobe at ffffffff8137ab2c
#22 [ffff88003d60bea0] alloc_aggr_kprobe.isra.17 at ffffffff8137bb9b
#23 [ffff88003d60bec0] register_kprobe at ffffffff8137cf16
#24 [ffff88003d60bf00] init_module at ffffffffa001101b [testcase1]
#25 [ffff88003d60bf10] do_one_initcall at ffffffff810020b6
#26 [ffff88003d60bf40] sys_init_module at ffffffff81083c4f
#27 [ffff88003d60bf80] system_call_fastpath at ffffffff8137d6e9
    RIP: 00007f0fec23814a  RSP: 00007fff29328218  RFLAGS: 00000206
    RAX: 00000000000000af  RBX: ffffffff8137d6e9  RCX: 00007f0fec23448a
    RDX: 00007f0fed0b0010  RSI: 000000000002be0b  RDI: 00007f0fec8df000
    RBP: 00007f0fed0b11d0   R8: 0000000000000003   R9: 0000000000000000
    R10: 00007f0fec23448a  R11: 0000000000000206  R12: 00007f0fed0b0010
    R13: 00007f0fed0b12a0  R14: 00007f0fed0b00c0  R15: 0000000000000000
    ORIG_RAX: 00000000000000af  CS: e033  SS: e02b
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