* Re: 2.6.37, 2.6.38, 2.6.39 vfs/ext3/ext4 crash when unplugging USB storage
[not found] <20110525132356.GA6296@janus>
@ 2011-05-27 6:37 ` Torsten Hilbrich
2011-06-07 10:36 ` Torsten Hilbrich
0 siblings, 1 reply; 2+ messages in thread
From: Torsten Hilbrich @ 2011-05-27 6:37 UTC (permalink / raw)
To: Frank van Maarseveen; +Cc: LKML, linux-ext4
Am 25.05.2011 15:23, schrieb Frank van Maarseveen:
> Kernel crashes in various interesting ways using this command sequence
> with an ext3/ext4 formatted USB storage device (not write-preotected):
>
> mount /dev/sdb1 /mnt
> cd /mnt
> ls
> # unplug device here
> umount -l -f /mnt
> cd
>
> Reproducable on FC15 live image using the file manager.
Just to give an example of such a crash, created with ext3 on v2.6.39:
EXT3-fs (sdb3): using internal journal
EXT3-fs (sdb3): recovery complete
EXT3-fs (sdb3): mounted filesystem with writeback data mode
usb 1-5: USB disconnect, device number 6
JBD: I/O error detected when updating journal superblock for sdb3.
Aborting journal on device sdb3.
JBD: I/O error detected when updating journal superblock for sdb3.
journal commit I/O error
general protection fault: 0000 [#1] SMP
last sysfs file:
CPU 1
Modules linked in:
Pid: 520, comm: bdi-default Not tainted 2.6.39 #40 LENOVO 20077KG/20077KG
RIP: 0010:[<ffffffff811221f6>] [<ffffffff811221f6>] redirty_tail+0x56/0xb0
RSP: 0018:ffff88007cd49c08 EFLAGS: 00010292
RAX: ffff88007d17b408 RBX: ffffffff8201d840 RCX: 6b6b6b6b6b6b6b6b
RDX: ffff88007c3a1070 RSI: ffff88007c3a11c8 RDI: ffffffff81d33f32
RBP: ffff88007cd49c10 R08: ffffffff8201d8b8 R09: ffff88007cd49c40
R10: 0000000000000000 R11: ffffffff8201d8b8 R12: ffff88007bcee218
R13: ffff88007cd49cc0 R14: ffff88007d17b408 R15: ffffffff8201d8c8
FS: 0000000000000000(0000) GS:ffff88007fd00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 00007f713597ebeb CR3: 0000000002003000 CR4: 00000000000006a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process bdi-default (pid: 520, threadinfo ffff88007cd48000, task ffff88007cc65180)
Stack:
ffffffff8201d840 ffff88007cd49c70 ffffffff811228fb ffff88007fc11b40
0000000000011b01 ffff88007fc11b40 ffffffff8201d8d8 ffff88007d17b470
ffffffff8201d840 ffff88007bde3d38 0000000000000400 0000000000000000
Call Trace:
[<ffffffff811228fb>] writeback_sb_inodes+0x8b/0x1b0
[<ffffffff811235ff>] wb_writeback+0x18f/0x460
[<ffffffff81123971>] wb_do_writeback+0xa1/0x280
[<ffffffff81051b80>] ? del_timer+0xe0/0xe0
[<ffffffff810d70a7>] bdi_forker_thread+0xc7/0x510
[<ffffffff810d6fe0>] ? bdi_debug_stats_show+0x170/0x170
[<ffffffff810d6fe0>] ? bdi_debug_stats_show+0x170/0x170
[<ffffffff81063a86>] kthread+0x96/0xa0
[<ffffffff819c79f4>] kernel_thread_helper+0x4/0x10
[<ffffffff810639f0>] ? kthread_worker_fn+0x190/0x190
[<ffffffff819c79f0>] ? gs_change+0xb/0xb
Code: 40 01 00 00 48 8b 52 68 8b 0d 27 01 ee 00 89 ce c1 fe 08 40 38 ce 74 66 48 8b 8a 58 01 00 00 48 8d b2 58 01 00 00 48 39 ce 74 15
8b 59 e8 48 39 58 50 79 0b 48 8b 0d b9 56 ff 00 48 89 48 50
RIP [<ffffffff811221f6>] redirty_tail+0x56/0xb0
RSP <ffff88007cd49c08>
---[ end trace 04e2da502b7fc110 ]---
Complete logs stored at: http://paste.debian.net/118118/
Steps performed for crash:
- mount -t ext3 /dev/sdb3 /mnt
- cd /mnt
- ls
- cd ~
- remove stick
- call umount /mnt
The code points to:
static int writeback_sb_inodes(struct super_block *sb, struct bdi_writeback *wb,
struct writeback_control *wbc, bool only_this_sb)
{
while (!list_empty(&wb->b_io)) {
long pages_skipped;
struct inode *inode = wb_inode(wb->b_io.prev);
if (inode->i_sb != sb) {
if (only_this_sb) {
/*
* We only want to write back data for this
* superblock, move all inodes not belonging
* to it back onto the dirty list.
*/
redirty_tail(inode);
continue;
}
Location write_back_sb_inodes+0x8b is 194b:
redirty_tail(inode);
1940: 4c 89 f7 mov %r14,%rdi
1943: 88 4d b8 mov %cl,-0x48(%rbp)
1946: e8 a5 f8 ff ff callq 11f0 <redirty_tail>
continue;
194b: 0f b6 4d b8 movzbl -0x48(%rbp),%ecx
194f: eb ab jmp 18fc <writeback_sb_inodes+0x3c>
1951: 0f 1f 80 00 00 00 00 nopl 0x0(%rax)
raw_spin_lock_init(&(_lock)->rlock); \
} while (0)
Torsten
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