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Date: Tue, 25 Mar 2014 10:33:43 +0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: Al Viro <viro@...iv.linux.org.uk>
Cc: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [mnt_hash] BUG: unable to handle kernel paging request at
ffffffff81176112
Hi Al,
I got the below dmesg and the first bad commit is
commit 3d54406d3c64c0e7e092f8299c460ebe0aea9795
Author: Al Viro <viro@...iv.linux.org.uk>
AuthorDate: Thu Mar 20 21:10:51 2014 -0400
Commit: Al Viro <viro@...iv.linux.org.uk>
CommitDate: Thu Mar 20 21:10:51 2014 -0400
switch mnt_hash to hlist
Cc: stable@...r.kernel.org
Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
===================================================
PARENT COMMIT NOT CLEAN. LOOK OUT FOR WRONG BISECT!
===================================================
+------------------------------------------------------+------------+------------+------------+
| | 6a92faa1d6 | 3d54406d3c | 77a67cc34b |
+------------------------------------------------------+------------+------------+------------+
| boot_successes | 429 | 41 | 12 |
| boot_failures | 4 | 44 | 17 |
| BUG:unable_to_handle_kernel_NULL_pointer_dereference | 4 | 4 | |
| Oops | 4 | 44 | 17 |
| RIP:rapl_pmu_init | 4 | | |
| Kernel_panic-not_syncing:Fatal_exception | 4 | 44 | 17 |
| backtrace:rapl_pmu_init | 4 | | |
| backtrace:kernel_init_freeable | 4 | | |
| RIP:umount_tree | 0 | 4 | |
| backtrace:do_group_exit | 0 | 3 | |
| backtrace:SyS_exit_group | 0 | 3 | |
| backtrace:unshare_nsproxy_namespaces | 0 | 1 | |
| backtrace:SyS_unshare | 0 | 1 | |
| BUG:unable_to_handle_kernel_paging_request | 0 | 40 | 17 |
| RIP:dentry_kill | 0 | 40 | 17 |
| backtrace:namespace_unlock | 0 | 40 | 17 |
| backtrace:SyS_umount | 0 | 40 | 17 |
+------------------------------------------------------+------------+------------+------------+
[ 4.406852] Freeing unused kernel memory: 1832K (ffff880001a36000 - ffff880001c00000)
[ 4.427969] Freeing unused kernel memory: 876K (ffff880001f25000 - ffff880002000000)
Kernel tests: Boot OK!
[ 531.406767] BUG: unable to handle kernel paging request at ffffffff81176112
[ 531.408103] IP: [<ffffffff811771a2>] dentry_kill.isra.25+0xd0/0x2cb
[ 531.408103] PGD 2015067 PUD 2016063 PMD 10001e1
[ 531.408103] Oops: 0003 [#1]
[ 531.408103] Modules linked in:
[ 531.408103] CPU: 0 PID: 363 Comm: umount Not tainted 3.14.0-rc7-00038-g3d54406 #39
[ 531.408103] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 531.408103] task: ffff88000e3b7320 ti: ffff88000e376000 task.ti: ffff88000e376000
[ 531.408103] RIP: 0010:[<ffffffff811771a2>] [<ffffffff811771a2>] dentry_kill.isra.25+0xd0/0x2cb
[ 531.408103] RSP: 0018:ffff88000e377ea0 EFLAGS: 00010202
[ 531.408103] RAX: ffffffff81176112 RBX: ffff88000efd1210 RCX: ffff88000e7c9ab8
[ 531.408103] RDX: ffff88000e7c9ab8 RSI: ffffffff8117f37f RDI: ffff88000efd1210
[ 531.408103] RBP: ffff88000e377eb8 R08: 00000000ffffffff R09: 0000000000000000
[ 531.408103] R10: 0000000000737470 R11: ffff88000e3a7025 R12: ffff88000e7c9b90
[ 531.408103] R13: ffff88000ec075d0 R14: 0000000000000000 R15: ffff88000e7c9a80
[ 531.408103] FS: 00007f86c2759700(0000) GS:ffffffff82030000(0000) knlGS:0000000000000000
[ 531.408103] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 531.408103] CR2: ffffffff81176112 CR3: 000000000e273000 CR4: 00000000000006f0
[ 531.408103] Stack:
[ 531.408103] ffff88000efd1210 ffff88000e7c9b90 ffff88000e7c9a80 ffff88000e377ed0
[ 531.408103] ffffffff811779c8 ffff88000e7c9b90 ffff88000e377ee8 ffffffff81168638
[ 531.408103] ffff88000e7c9a80 ffff88000e377f08 ffffffff8117fda2 ffff88000e7c9aa0
[ 531.408103] Call Trace:
[ 531.408103] [<ffffffff811779c8>] dput+0x184/0x1b8
[ 531.408103] [<ffffffff81168638>] path_put+0x18/0x31
[ 531.408103] [<ffffffff8117fda2>] namespace_unlock+0xb8/0xd1
[ 531.408103] [<ffffffff81181f09>] SyS_umount+0x4a4/0x4f2
[ 531.408103] [<ffffffff8113c9db>] ? vm_munmap+0x5d/0x72
[ 531.408103] [<ffffffff81a28bb7>] system_call_fastpath+0x16/0x1b
[ 531.408103] Code: ff 05 23 cf 3c 01 e8 dc dd ff ff 48 ff 05 1f cf 3c 01 48 ff 05 00 af 3c 01 48 8b 83 98 00 00 00 48 8b 93 90 00 00 00 48 89 42 08 <48> 89 10 48 b8 00 01 10 00 00 00 ad de 48 89 83 90 00 00 00 81
[ 531.408103] RIP [<ffffffff811771a2>] dentry_kill.isra.25+0xd0/0x2cb
[ 531.408103] RSP <ffff88000e377ea0>
[ 531.408103] CR2: ffffffff81176112
[ 531.408103] ---[ end trace 2d4bf249e005ed27 ]---
[ 531.408103] Kernel panic - not syncing: Fatal exception
git bisect start 77a67cc34b63c0f868f0bb66e7c23dd2743b2d97 dcb99fd9b08cfe1afe426af4d8d3cbc429190f15 --
git bisect bad fca1d772b6e12a5e5e3e5749f8b06650aeecbc6c # 05:49 0- 13 Merge 'vfs/untested-mnt_hash' into devel-cairo-x86_64-201403211021
git bisect good 92fef99b88a854a6dbfd25fb1c4305662a182452 # 05:49 85+ 0 0day base guard for 'devel-cairo-x86_64-201403211021'
git bisect good 8a21d9f63dd47485964b930af41304d88dee0e9b # 05:53 30+ 1 Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus
git bisect good ea1cd65a648bd98ff9d028a647462d28313aadfd # 05:59 30+ 1 Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect good 887843961c4b4681ee993c36d4997bf4b4aa8253 # 06:04 30+ 2 mm: fix bad rss-counter if remap_file_pages raced migration
git bisect good 8cefb970aa3b94377554d5083611768ff257ce19 # 06:04 85+ 0 resizable namespace.c hashes
git bisect bad 3d54406d3c64c0e7e092f8299c460ebe0aea9795 # 06:04 0- 44 switch mnt_hash to hlist
git bisect good 6a92faa1d647d78ec54506d783c5a7ce503b4843 # 06:11 31+ 4 smarter propagate_mnt()
# first bad commit: [3d54406d3c64c0e7e092f8299c460ebe0aea9795] switch mnt_hash to hlist
git bisect good 6a92faa1d647d78ec54506d783c5a7ce503b4843 # 06:16 93+ 4 smarter propagate_mnt()
git bisect bad 77a67cc34b63c0f868f0bb66e7c23dd2743b2d97 # 06:16 0- 17 0day head guard for 'devel-cairo-x86_64-201403211021'
git bisect good 774868c7094d35b4518be3d0e654de000a5d11fc # 06:32 93+ 0 Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect good 098bc161bfc7697f7e2ca15400f13ca1ac60e9dd # 06:54 93+ 0 Add linux-next specific files for 20140324
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,
Fengguang
View attachment "dmesg-yocto-jaketown-17:20140321145144:x86_64-randconfig-c4-0321::" of type "text/plain" (51959 bytes)
View attachment "dmesg-quantal-waimea-11:20140321154318:x86_64-randconfig-c4-0321:3.14.0-rc7-00037-g6a92faa:41" of type "text/plain" (35793 bytes)
Download attachment "x86_64-randconfig-c4-0321-77a67cc34b63c0f868f0bb66e7c23dd2743b2d97-BUG:-unable-to-handle-kernel-paging-request-50438.log" of type "application/octet-stream" (29611 bytes)
View attachment "config-3.14.0-rc7-00038-g3d54406" of type "text/plain" (100884 bytes)
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