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Date:	Sun, 15 Jun 2014 15:12:54 +0800
From:	Jet Chen <jet.chen@...el.com>
To:	Greg Price <price@....EDU>
CC:	"Theodore Ts'o" <tytso@....edu>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Yuanhan Liu <yuanhan.liu@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	lkp@...org
Subject: [random] BUG: spinlock trylock failure on UP on CPU#0, swapper/1

Hi Greg,

0day kernel testing robot got the below dmesg and the first bad commit is

git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
commit 0fb7a01af5b0cbe5bf365891fc4d186f2caa23f7
Author:     Greg Price <price@....EDU>
AuthorDate: Thu Dec 5 19:32:19 2013 -0500
Commit:     Theodore Ts'o <tytso@....edu>
CommitDate: Wed Mar 19 22:18:51 2014 -0400

    random: simplify accounting code
        With this we handle "reserved" in just one place.  As a bonus the
    code becomes less nested, and the "wakeup_write" flag variable
    becomes unnecessary.  The variable "flags" was already unused.
        This code behaves identically to the previous version except in
    two pathological cases that don't occur.  If the argument "nbytes"
    is already less than "min", then we didn't previously enforce
    "min".  If r->limit is false while "reserved" is nonzero, then we
    previously applied "reserved" in checking whether we had enough
    bits, even though we don't apply it to actually limit how many we
    take.  The callers of account() never exercise either of these cases.
        Before the previous commit, it was possible for "nbytes" to be less
    than "min" if userspace chose a pathological configuration, but no
    longer.
        Cc: Jiri Kosina <jkosina@...e.cz>
    Cc: "H. Peter Anvin" <hpa@...or.com>
    Signed-off-by: Greg Price <price@....edu>
    Signed-off-by: "Theodore Ts'o" <tytso@....edu>

+-------------------------------------------+------------+------------+
|                                           | 8c2aa3390e | 0fb7a01af5 |
+-------------------------------------------+------------+------------+
| boot_successes                            | 66         | 2          |
| boot_failures                             | 0          | 20         |
| BUG:spinlock_trylock_failure_on_UP_on_CPU | 0          | 20         |
| backtrace:prandom_reseed                  | 0          | 11         |
| backtrace:kernel_init_freeable            | 0          | 11         |
+-------------------------------------------+------------+------------+

[  374.075477] raid6test: test_disks(62, 63): faila= 62(P)  failb= 63(Q)  OK
[  374.192518] raid6test: [  374.312137] raid6test: complete (2429 tests, 0 failures)
[  374.434548] BUG: spinlock trylock failure on UP on CPU#0, swapper/1
[  374.444114]  lock: lock.13830+0x0/0x50, .magic: dead4ead, .owner: swapper/1, .owner_cpu: 0
[  374.444114] CPU: 0 PID: 1 Comm: swapper Not tainted 3.14.0-rc2-00009-g0fb7a01 #1
[  374.444114] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  374.444114]  0000000000000000 ffff88001386fc28 ffffffff81ec8af8 ffff88001386fc48
[  374.444114]  ffffffff81ec26d9 0000000000000000 ffffffff827db7a0 ffff88001386fc68
[  374.444114]  ffffffff81ec2704 ffffffff827db7a0 ffffffff823b74f3 ffff88001386fc80
[  374.444114] Call Trace:
[  374.444114]  [<ffffffff81ec8af8>] dump_stack+0x19/0x1b
[  374.444114]  [<ffffffff81ec26d9>] spin_dump+0x85/0x8a
[  374.444114]  [<ffffffff81ec2704>] spin_bug+0x26/0x28
[  374.444114]  [<ffffffff810ae690>] do_raw_spin_trylock+0x37/0x3c
[  374.444114]  [<ffffffff81ed707b>] _raw_spin_lock_irqsave+0x4b/0x7a
[  374.444114]  [<ffffffff814f5f69>] ? __prandom_reseed+0x1a/0xad
[  374.444114]  [<ffffffff814f5f69>] __prandom_reseed+0x1a/0xad
[  374.444114]  [<ffffffff814f6183>] prandom_reseed_late+0xe/0x10
[  374.444114]  [<ffffffff8162f31c>] credit_entropy_bits+0x116/0x21e
[  374.444114]  [<ffffffff8162f8d9>] _xfer_secondary_pool+0x86/0x8f
[  374.444114]  [<ffffffff810abe66>] ? __lock_acquire.isra.20+0x4cf/0x5cd
[  374.444114]  [<ffffffff8162f963>] xfer_secondary_pool+0x5d/0x5f
[  374.444114]  [<ffffffff8162fa0a>] extract_entropy+0xa5/0x16b
[  374.444114]  [<ffffffff816301cc>] get_random_bytes+0x1b/0x1d
[  374.444114]  [<ffffffff814f5f8f>] __prandom_reseed+0x40/0xad
[  374.444114]  [<ffffffff810e7b32>] ? put_page+0x20/0x22
[  374.444114]  [<ffffffff8295f922>] ? radix_tree_init+0xce/0xce
[  374.444114]  [<ffffffff8295f92e>] prandom_reseed+0xc/0x49
[  374.444114]  [<ffffffff8295f922>] ? radix_tree_init+0xce/0xce
[  374.444114]  [<ffffffff8293ae11>] do_one_initcall+0x7d/0x108
[  374.444114]  [<ffffffff81098f9c>] ? parse_args+0x180/0x246
[  374.444114]  [<ffffffff8293af92>] kernel_init_freeable+0xf6/0x187
[  374.444114]  [<ffffffff8293a70e>] ? do_early_param+0x8a/0x8a
[  374.444114]  [<ffffffff81ebe658>] ? rest_init+0xbc/0xbc
[  374.444114]  [<ffffffff81ebe661>] kernel_init+0x9/0xd0
[  374.444114]  [<ffffffff81ed850a>] ret_from_fork+0x7a/0xb0
[  374.444114]  [<ffffffff81ebe658>] ? rest_init+0xbc/0xbc

Elapsed time: 380
qemu-system-x86_64 -cpu kvm64 -enable-kvm -kernel /kernel/x86_64-randconfig-hsxa1-06150953/0fb7a01af5b0cbe5bf365891fc4d186f2caa23f7/vmlinuz-3.14.0-rc2-00009-g0fb7a01 -append 'hung_task_panic=1 earlyprintk=ttyS0,115200 debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 panic=10 softlockup_panic=1 nmi_watchdog=panic  prompt_ramdisk=0 console=ttyS0,115200 console=tty0 vga=normal  root=/dev/ram0 rw link=/kbuild-tests/run-queue/kvm/x86_64-randconfig-hsxa1-06150953/linux-devel:devel-hourly-2014061509:0fb7a01af5b0cbe5bf365891fc4d186f2caa23f7:bisect-linux3/.vmlinuz-0fb7a01af5b0cbe5bf365891fc4d186f2caa23f7-20140615135429-17-ivb41 branch=linux-devel/devel-hourly-2014061509 BOOT_IMAGE=/kernel/x86_64-randconfig-hsxa1-06150953/0fb7a01af5b0cbe5bf365891fc4d186f2caa23f7/vmlinuz-3.14.0-rc2-00009-g0fb7a01 drbd.minor_count=8'  -initrd /kernel-tests/initrd/yocto-minimal-x86_64.cgz -m 320 -smp 2 -net nic,vlan=1,model=e1000 -net user,vlan=1 -boot order=nc -no-reboot -watchdog i6300esb

-rtc base=localtime -pidfile /dev/shm/kboot/pid-yocto-ivb41-47 -serial file:/dev/shm/kboot/serial-yocto-ivb41-47 -daemonize -display none -monitor null

git bisect start v3.15 v3.14 --
git bisect  bad 674366e90e5a2430e3ddef40ce51512d681944e4  # 10:49      0-      3  Merge tag 'pci-v3.15-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci
git bisect  bad 9f800363bb0ea459e15bef0928a72c88d374e489  # 11:28      2-     14  Merge tag 'fixes-non-critical-3.15' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
git bisect good 1aabc5990d205cdb0789a1c26143c53601e9bb07  # 11:38     21+      0  x86: Fix dumpstack_64 to keep state of "used" variable in loop
git bisect good d0cb5f71c5cde8e1ef6d03983641366800ceabdb  # 11:51     21+      0  Merge tag 'vfio-v3.15-rc1' of git://github.com/awilliam/linux-vfio
git bisect good d15fee814d8d30bbb4859ef8fef7a1f96327635b  # 12:07     21+      0  Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse
git bisect  bad d1d9cfc330e2622f4b4e0b82d3b41a34619614d4  # 12:16      1-      8  Merge tag 'random_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random
git bisect good 24e7ea3bea94fe05eae5019f5f12bcdc98fc5157  # 12:27     21+      0  Merge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
git bisect good d15e03104eb9a4f8e244ab6ed3ca5a107e46db13  # 12:40     21+      0  Merge tag 'xfs-for-linus-3.15-rc1' of git://oss.sgi.com/xfs/xfs
git bisect good cda540ace6a194850e23c79955cc2e46fd91c19a  # 13:15     21+      0  mm: get_user_pages(write,force) refuse to COW in shared areas
git bisect good 8c2aa3390ebb59cba4495a56557b70ad0575eef5  # 13:34     21+      0  random: tighten bound on random_read_wakeup_thresh
git bisect  bad 46884442fc5bb81a896f7245bd850fde9b435509  # 13:44      0-      2  random: use the architectural HWRNG for the SHA's IV in extract_buf()
git bisect  bad 7d1b08c40c4f02c119476b29eca9bbc8d98d2a83  # 13:52      2-      9  random: entropy_bytes is actually bits
git bisect  bad 0fb7a01af5b0cbe5bf365891fc4d186f2caa23f7  # 14:01      0-      5  random: simplify accounting code
# first bad commit: [0fb7a01af5b0cbe5bf365891fc4d186f2caa23f7] random: simplify accounting code
git bisect good 8c2aa3390ebb59cba4495a56557b70ad0575eef5  # 14:11     66+      0  random: tighten bound on random_read_wakeup_thresh
git bisect  bad 1d08ab37636d6a169c67e879cba37675cd82e6ac  # 14:11      0-     11  0day head guard for 'devel-hourly-2014061509'
git bisect  bad abf04af74a9f27a65172a43b43ccabcbc2bbdc39  # 14:27      3-      2  Merge tag 'scsi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
git bisect  bad f9801c532e045c1ab89801d0597353c5e2a55671  # 14:41      5-      8  Add linux-next specific files for 20140613


This script may reproduce the error.

-----------------------------------------------------------------------------
#!/bin/bash

kernel=$1
initrd=yocto-minimal-x86_64.cgz

wget --no-clobber https://github.com/fengguang/reproduce-kernel-bug/blob/master/initrd/$initrd

kvm=(
	qemu-system-x86_64 -cpu kvm64 -enable-kvm
 	-kernel $kernel
	-initrd $initrd
	-smp 2
	-m 256M
	-net nic,vlan=0,macaddr=00:00:00:00:00:00,model=virtio
	-net user,vlan=0
	-net nic,vlan=1,model=e1000
	-net user,vlan=1
	-boot order=nc
	-no-reboot
	-watchdog i6300esb
	-serial stdio
	-display none
	-monitor null
)

append=(
	debug
	sched_debug
	apic=debug
	ignore_loglevel
	sysrq_always_enabled
	panic=10
	prompt_ramdisk=0
	earlyprintk=ttyS0,115200
	console=ttyS0,115200
	console=tty0
	vga=normal
	root=/dev/ram0
	rw
)

"${kvm[@]}" --append "${append[*]}"
-----------------------------------------------------------------------------

Thanks,
Jet


View attachment "dmesg-yocto-ivb41-47:20140615140105:x86_64-randconfig-hsxa1-06150953:3.14.0-rc2-00009-g0fb7a01:1" of type "text/plain" (245004 bytes)

Download attachment "x86_64-randconfig-hsxa1-06150953-1d08ab37636d6a169c67e879cba37675cd82e6ac-BUG:-spinlock-trylock-failure-on-UP-on-CPU---16957.log" of type "application/octet-stream" (68720 bytes)

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