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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) View attachment "config-3.14.0-rc2-00009-g0fb7a01" of type "text/plain" (86488 bytes) View attachment "Attached Message Part" of type "text/plain" (87 bytes)
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