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Date: Tue, 19 Aug 2014 19:40:03 +0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: "Eric W. Biederman" <ebiederman@...tter.com>
Cc: Al Viro <viro@...iv.linux.org.uk>, LKP <lkp@...org>,
linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [vfs mnt_set_mountpoint] BUG: unable to handle kernel paging request
at 5a5a5a5e
Greetings,
0day kernel testing robot got the below dmesg and the first bad commit is
git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
commit 89f7ca1af15bdfe7a6aed343032a84af2a69f736
Author: Eric W. Biederman <ebiederman@...tter.com>
AuthorDate: Sun Sep 22 19:37:01 2013 -0700
Commit: Al Viro <viro@...iv.linux.org.uk>
CommitDate: Sun Aug 17 07:02:00 2014 -0400
vfs: Keep a list of mounts on a mount point
To spot any possible problems call BUG if a mountpoint
is put when it's list of mounts is not empty.
AV: use hlist instead of list_head
Reviewed-by: Miklos Szeredi <miklos@...redi.hu>
Signed-off-by: Eric W. Biederman <ebiederman@...tter.com>
Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
+-----------------------------------------------------------------------------+------------+------------+---------------+
| | de0ed92a2f | 89f7ca1af1 | next-20140818 |
+-----------------------------------------------------------------------------+------------+------------+---------------+
| boot_successes | 40 | 0 | 0 |
| boot_failures | 40 | 20 | 11 |
| BUG:kernel_boot_hang | 39 | | |
| BUG:kernel_boot_crashed | 1 | | |
| BUG:unable_to_handle_kernel_paging_request | 0 | 20 | 11 |
| Oops | 0 | 20 | 11 |
| EIP_is_at_mnt_set_mountpoint | 0 | 20 | 11 |
| BUG:sleeping_function_called_from_invalid_context_at_kernel/locking/rwsem.c | 0 | 20 | 11 |
| INFO:lockdep_is_turned_off | 0 | 20 | 11 |
| Kernel_panic-not_syncing:Attempted_to_kill_init_exitcode= | 0 | 14 | 10 |
| backtrace:do_mount | 0 | 20 | 11 |
| backtrace:SyS_mount | 0 | 20 | 11 |
+-----------------------------------------------------------------------------+------------+------------+---------------+
[ 12.976559] Key type encrypted registered
[ 12.979538] rtc_cmos 00:00: setting system clock to 2014-08-19 16:00:57 UTC (1408464057)
[ 12.981664] debug: unmapping init [mem 0x7aff4000-0x7b220fff]
[ 12.986791] BUG: unable to handle kernel paging request at 5a5a5a5e
[ 12.987028] IP: [<7922d346>] mnt_set_mountpoint+0x76/0x90
[ 12.987028] *pde = 00000000
[ 12.987028] Oops: 0002 [#1] SMP DEBUG_PAGEALLOC
[ 12.987028] CPU: 0 PID: 1 Comm: init Not tainted 3.16.0-10739-g89f7ca1 #1
[ 12.987028] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 12.987028] task: 87cc1320 ti: 87cc4000 task.ti: 87cc4000
[ 12.987028] EIP: 0060:[<7922d346>] EFLAGS: 00010202 CPU: 0
[ 12.987028] EIP is at mnt_set_mountpoint+0x76/0x90
[ 12.987028] EAX: 00000001 EBX: 5a5a5a5a ECX: 87c93700 EDX: 7cc308a0
[ 12.987028] ESI: 87c93778 EDI: 00000001 EBP: 87cc5ebc ESP: 87cc5ea8
[ 12.987028] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
[ 12.987028] CR0: 80050033 CR2: 5a5a5a5e CR3: 04c51000 CR4: 00040690
[ 12.987028] Stack:
[ 12.987028] 87c93700 7cc308a0 87c93700 87c93b80 00000001 87cc5eec 7922eb3c 00000000
[ 12.987028] 00000001 00000000 7922eca4 00000001 7cc308a0 00000000 00004000 00000000
[ 12.987028] 00000001 87cc5f08 7922eca4 00000000 87c93b80 00000000 7cc308a0 87c93700
[ 12.987028] Call Trace:
[ 12.987028] [<7922eb3c>] attach_recursive_mnt+0x1cc/0x2b0
[ 12.987028] [<7922eca4>] ? graft_tree+0x84/0xa0
[ 12.987028] [<7922eca4>] graft_tree+0x84/0xa0
[ 12.987028] [<7922ede3>] do_add_mount+0x123/0x190
[ 12.987028] [<79230b64>] do_mount+0xfb4/0x12f0
[ 12.987028] [<7922fb84>] ? copy_mount_string+0x54/0x80
[ 12.987028] [<79231301>] SyS_mount+0xf1/0x120
[ 12.987028] [<7a2b26f7>] syscall_call+0x7/0x7
[ 12.987028] Code: 31 c0 89 59 08 8d 71 78 89 51 74 8b 5a 0c 85 db 0f 95 c0 8b 3c 85 ac 38 c8 7a 89 59 78 83 c7 01 85 c0 89 3c 85 ac 38 c8 7a 74 03 <89> 73 04 89 72 0c 83 c2 0c 89 51 7c 83 c4 08 5b 5e 5f 5d c3 8d
[ 12.987028] EIP: [<7922d346>] mnt_set_mountpoint+0x76/0x90 SS:ESP 0068:87cc5ea8
[ 12.987028] CR2: 000000005a5a5a5e
[ 12.987028] ---[ end trace ee8b0a2eb2e91b64 ]---
[ 12.987028] BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:41
git bisect start f68f82364938548b58b51d4b926642b0a3cf4c27 7d1311b93e58ed55f3a31cc8f94c4b8fe988a2b9 --
git bisect bad 473f9639819684765e78d298f192b8030fe1290c # 15:02 0- 9 Merge remote-tracking branch 'block/for-next'
git bisect good 9a9d24bbcb7185700286b300e1db132a481d0e1f # 15:07 20+ 1 Merge remote-tracking branch 'tile/master'
git bisect bad c0698b7d9847e0cbc46881368ec9c72474968ad8 # 15:10 0- 20 Merge remote-tracking branch 'hid/for-next'
git bisect good f55058463a57a59e8b5a59f8b4ae1875c7a91a44 # 15:14 20+ 9 Merge remote-tracking branch 'fscache/fscache'
git bisect good 76bb1241bec5f597b025b997d6ae7e193dab8289 # 15:26 20+ 6 Merge remote-tracking branch 'logfs/master'
git bisect bad 9016ceb4b3699bc95ffaeed371e5fd0745bab224 # 15:48 0- 20 Merge remote-tracking branch 'vfs/for-next'
git bisect bad 76a8a45241be2aff38944e74811e23d1024a71fa # 15:59 0- 1 vfs: Make d_invalidate return void
git bisect bad 89f7ca1af15bdfe7a6aed343032a84af2a69f736 # 16:03 0- 18 vfs: Keep a list of mounts on a mount point
git bisect good 7fed866b5ce6f45fb0c226c6ff897d7af3a1176a # 16:11 20+ 4 vfs: Document the effect of d_revalidate on d_find_alias
git bisect good de0ed92a2fbb9eb93a97da7612363c8c3130ec20 # 16:26 20+ 13 vfs: Don't allow overwriting mounts in the current mount namespace
# first bad commit: [89f7ca1af15bdfe7a6aed343032a84af2a69f736] vfs: Keep a list of mounts on a mount point
git bisect good de0ed92a2fbb9eb93a97da7612363c8c3130ec20 # 16:39 60+ 40 vfs: Don't allow overwriting mounts in the current mount namespace
git bisect bad f68f82364938548b58b51d4b926642b0a3cf4c27 # 16:39 0- 11 Add linux-next specific files for 20140818
git bisect good 7d1311b93e58ed55f3a31cc8f94c4b8fe988a2b9 # 16:44 60+ 16 Linux 3.17-rc1
git bisect bad f68f82364938548b58b51d4b926642b0a3cf4c27 # 16:44 0- 11 Add linux-next specific files for 20140818
This script may reproduce the error.
----------------------------------------------------------------------------
#!/bin/bash
kernel=$1
initrd=quantal-core-i386.cgz
wget --no-clobber https://github.com/fengguang/reproduce-kernel-bug/raw/master/initrd/$initrd
kvm=(
qemu-system-x86_64
-enable-kvm
-cpu Haswell,+smep,+smap
-kernel $kernel
-initrd $initrd
-m 320
-smp 2
-net nic,vlan=1,model=e1000
-net user,vlan=1
-boot order=nc
-no-reboot
-watchdog i6300esb
-rtc base=localtime
-serial stdio
-display none
-monitor null
)
append=(
hung_task_panic=1
earlyprintk=ttyS0,115200
debug
apic=debug
sysrq_always_enabled
rcupdate.rcu_cpu_stall_timeout=100
panic=10
softlockup_panic=1
nmi_watchdog=panic
load_ramdisk=2
prompt_ramdisk=0
console=ttyS0,115200
console=tty0
vga=normal
root=/dev/ram0
rw
drbd.minor_count=8
)
"${kvm[@]}" --append "${append[*]}"
----------------------------------------------------------------------------
Thanks,
Fengguang
--
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