Re: [logfs] BUG: unable to handle kernel NULL pointer dereference at (null)
From: Fengguang Wu
Date: Sun Mar 23 2014 - 07:01:43 EST
Hi Prasad,
I'm running a minimal yocto image for kernel testing. It seems trying
to auto mount nbdXX:
[ 0.916579] EXT2-fs (nbd8): error: unable to read superblock
[ 0.917449] block nbd8: Attempted send on closed socket
[ 0.918250] FAT-fs (nbd8): unable to read boot sector
[ 0.919032] block nbd7: Attempted send on closed socket
[ 0.919840] EXT2-fs (nbd7): error: unable to read superblock
[ 0.920685] block nbd7: Attempted send on closed socket
[ 0.921483] FAT-fs (nbd7): unable to read boot sector
[ 0.922329] block nbd9: Attempted send on closed socket
[ 0.923141] EXT2-fs (nbd9): error: unable to read superblock
[ 0.924018] block nbd9: Attempted send on closed socket
[ 0.924840] FAT-fs (nbd9): unable to read boot sector
[ 0.926133] block nbd13: Attempted send on closed socket
[ 0.926961] FAT-fs (nbd13): unable to read boot sector
[ 0.927794] block nbd14: Attempted send on closed socket
[ 0.928616] FAT-fs (nbd14): unable to read boot sector
[ 0.929437] block nbd5: Attempted send on closed socket
[ 0.930244] FAT-fs (nbd5): unable to read boot sector
> > [ 0.931658] LogFS: Start unmounting
> > [ 0.932279] LogFS: Start mount 1
>
> Does this happen first time you try to mount LogFS?
> If yes can you please recreate the file system (mklogfs). To recreate
> the file system please clone the latest logfsprogs from
> https://github.com/prasad-joshi/logfsprogs.git
>
> If this does not help, can you please email me steps for reproducing
> the problem on my setup?
You may run this script to reproduce the problem. I'll send you the
3MB yocto image file in another email.
#!/bin/bash
kernel=$1
kvm=(
qemu-system-x86_64 -cpu kvm64 -enable-kvm
-kernel $kernel
-initrd /kernel-tests/initrd/yocto-minimal-x86_64.cgz
# -initrd /kernel-tests/initrd/yocto-minimal-i386.cgz
# -initrd /kernel-tests/initrd/quantal-core-i386.cgz
# -initrd /kernel-tests/initrd/quantal-core-x86_64.cgz
-smp 2
-m 256M
-net nic,vlan=0,macaddr=00:00:00:00:00:00,model=virtio
-net user,vlan=0
-net nic,vlan=1,model=e1000
-net user,vlan=1
-boot order=nc
-no-reboot
-watchdog i6300esb
-serial stdio
-display none
-monitor null
)
append=(
debug
sched_debug
apic=debug
ignore_loglevel
# dyndbg=\"func kobject_release +p\"
sysrq_always_enabled
panic=10
prompt_ramdisk=0
earlyprintk=ttyS0,115200
console=ttyS0,115200
console=tty0
vga=normal
root=/dev/ram0
rw
)
"${kvm[@]}" --append "${append[*]}"
Thanks,
Fengguang
> Thanks and Regards,
> Prasad
>
> > [ 0.932857] LogFS: Start unmounting
> > [ 0.933482] BUG: unable to handle kernel NULL pointer dereference at (null)
> > [ 0.934337] IP: [<ffffffff8149797f>] __mutex_lock_slowpath+0x4b/0xc2
> > [ 0.934337] PGD 11e41067 PUD 1183f067 PMD 0
> > [ 0.934337] Oops: 0002 [#1]
> > [ 0.934337] Modules linked in:
> > [ 0.934337] CPU: 0 PID: 498 Comm: mount Not tainted 3.14.0-rc7-next-20140321 #10
> > [ 0.934337] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
> > [ 0.934337] task: ffff8800007c3a80 ti: ffff880011fc8000 task.ti: ffff880011fc8000
> > [ 0.934337] RIP: 0010:[<ffffffff8149797f>] [<ffffffff8149797f>] __mutex_lock_slowpath+0x4b/0xc2
> > [ 0.934337] RSP: 0018:ffff880011fc9d10 EFLAGS: 00010286
> > [ 0.934337] RAX: 0000000000000000 RBX: ffff880011fbbcc0 RCX: 0000000000000002
> > [ 0.934337] RDX: 0000000000000000 RSI: 0000000000000067 RDI: ffff880011fbbcc0
> > [ 0.934337] RBP: ffff880011fc9d50 R08: ffff880011fc8000 R09: 0000000000000100
> > [ 0.934337] R10: 0000000000000001 R11: ffffffff81072933 R12: ffff880011fbbcc8
> > [ 0.934337] R13: ffff8800007c3a80 R14: 00000000ffffffff R15: ffff880011fbb000
> > [ 0.934337] FS: 00007f08f76f8700(0000) GS:ffffffff8181c000(0000) knlGS:0000000000000000
> > [ 0.934337] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> > [ 0.934337] CR2: 0000000000000000 CR3: 0000000011847000 CR4: 00000000000006b0
> > [ 0.934337] Stack:
> > [ 0.934337] ffff880011fbbcc8 0000000000000000 ffff880011fc9d18 0000000000000850
> > [ 0.934337] ffff880011fbbcc0 ffff880011e8e000 ffff880011fbb000 ffff880013365e00
> > [ 0.934337] ffff880011fc9d68 ffffffff81497a1d ffff880011e8e000 ffff880011fc9d80
> > [ 0.934337] Call Trace:
> > [ 0.934337] [<ffffffff81497a1d>] mutex_lock+0x27/0x2a
> > [ 0.934337] [<ffffffff8118ba48>] logfs_get_wblocks+0x55/0x60
> > [ 0.934337] [<ffffffff81189078>] logfs_sync_fs+0x14/0x30
> > [ 0.934337] [<ffffffff811012b4>] sync_filesystem+0x49/0x8e
> > [ 0.934337] [<ffffffff8118f1ec>] logfs_kill_sb+0x27/0xdc
> > [ 0.934337] [<ffffffff810e23cb>] deactivate_locked_super+0x2e/0x4f
> > [ 0.934337] [<ffffffff8118ff5d>] logfs_mount+0x6bd/0x6d5
> > [ 0.934337] [<ffffffff810e35c7>] mount_fs+0x10/0xa9
> > [ 0.934337] [<ffffffff810f7003>] vfs_kern_mount+0x5f/0xe3
> > [ 0.934337] [<ffffffff810f938f>] do_mount+0x72f/0x826
> > [ 0.934337] [<ffffffff810bb997>] ? strndup_user+0x35/0xcb
> > [ 0.934337] [<ffffffff810f96a8>] SyS_mount+0x80/0xb9
> > [ 0.934337] [<ffffffff81499137>] system_call_fastpath+0x16/0x1b
> > [ 0.934337] Code: 25 50 b0 81 81 ff 04 25 50 b0 81 81 8b 07 85 c0 79 23 48 8b 43 10 4c 8d 63 08 48 89 63 10 41 83 ce ff 4c 89 24 24 48 89 44 24 08 <48> 89 20 4c 89 6c 24 10 eb 2e 31 c0 87 07 ff c8 75 d5 eb 48 44
> > [ 0.934337] RIP [<ffffffff8149797f>] __mutex_lock_slowpath+0x4b/0xc2
> > [ 0.934337] RSP <ffff880011fc9d10>
> > [ 0.934337] CR2: 0000000000000000
> > [ 0.934337] ---[ end trace 5506712fb917b42d ]---
> > [ 0.934337] BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:20
> >
> > git bisect start v3.9 v3.8 --
> > git bisect bad 20f22ab42e9c832bde6e9a7ed04cdc73ec737e5b # 09:52 2- 3 signals: fix new kernel-doc warnings
> > git bisect good bbbd27e694ce2c5fde9c8fcedbea618dd9153fe7 # 10:07 27+ 27 Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
> > git bisect good bc2e4a90d9f75f1664c1587eb09ecd10bb71b022 # 10:19 27+ 19 Merge tag 'usb-3.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
> > git bisect bad d381f45c890a3fb136afb0dc1cbe025e066cb981 # 10:37 3- 19 Merge branch 'for-3.9/upstream-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid
> > git bisect good e3b59518c10e08eeb06215abf06f50e8f83b51dc # 10:46 27+ 18 Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
> > git bisect good d345243629db38a6340bcb69f372329d35b8f650 # 11:01 27+ 19 Merge tag 'regulator-3.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator
> > git bisect good af2841cdd4cb35248e41f7427d996c8f6b563051 # 11:12 27+ 17 Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux
> > git bisect bad 7b54c165a0c012edbaeaa73c5c87cb73721eb580 # 11:31 1- 19 vfs: don't BUG_ON() if following a /proc fd pseudo-symlink results in a symlink
> > git bisect bad 47b3bc907328db968bc9b43c41f48f8d1e140750 # 11:47 0- 6 Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
> > git bisect bad 3c4aff6b9a183b4f24eb7b8dd6c8a92cdba3bc75 # 12:05 0- 3 x86, doc: Be explicit about what the x86 struct boot_params requires
> > git bisect good 015221fefbc93689dd47508a66326556adf2abcd # 12:54 27+ 15 x86: Fix 32-bit *_cpu_data initializers
> > git bisect bad 2e604c0f19dcdd433b3863ffc3da9bc0787ca765 # 13:21 2- 6 x86: Don't clear efi_info even if the sentinel hits
> > git bisect bad 98e7a989979b185f49e86ddaed2ad6890299d9f0 # 13:29 0- 4 x86, mm: Make sure to find a 2M free block for the first mapped area
> > # first bad commit: [98e7a989979b185f49e86ddaed2ad6890299d9f0] x86, mm: Make sure to find a 2M free block for the first mapped area
> > git bisect good 015221fefbc93689dd47508a66326556adf2abcd # 13:38 81+ 73 x86: Fix 32-bit *_cpu_data initializers
> > git bisect bad 06ed26d1de59ce7cbbe68378b7e470be169750e5 # 13:39 0- 12 Add linux-next specific files for 20140321
> > git bisect bad 774868c7094d35b4518be3d0e654de000a5d11fc # 13:55 0- 3 Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
> > git bisect bad 06ed26d1de59ce7cbbe68378b7e470be169750e5 # 13:56 0- 12 Add linux-next specific files for 20140321
> >
> > Thanks,
> > Fengguang
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