Date:	Wed, 5 Sep 2012 13:50:54 -0400 (EDT)
From:	Lukáš Czerner <lczerner@...hat.com>
To:	Marc MERLIN <marc@...lins.org>
cc:	linux-ext4@...r.kernel.org
Subject: Re: ext4 crash with 3.5.2 in ext4_ext_remove_space

Hi,

I believe that this has been fixed with v3.6-rc1-5-g89a4e48 and it
was marked for stable release as well.

-Lukas

On Wed, 5 Sep 2012, Marc MERLIN wrote:

> Date: Wed, 5 Sep 2012 09:52:10 -0700
> From: Marc MERLIN <marc@...lins.org>
> To: linux-ext4@...r.kernel.org
> Subject: ext4 crash with 3.5.2 in ext4_ext_remove_space
> 
> I get a crash when mounting a filesystem.
> I'm making an image now with e2image -r before I run e2fsck on it.
> 
> Is there anything else you'd like me to do?
> 
> [13090.175424] BUG: unable to handle kernel NULL pointer dereference at 0000000000000028
> [13090.184897] IP: [<ffffffff8119b92f>] ext4_ext_remove_space+0x83d/0xb51
> [13090.192927] PGD 1120d7067 PUD 1123ac067 PMD 0 
> [13090.198469] Oops: 0000 [#1] PREEMPT SMP 
> [13090.203508] CPU 1 
> [13090.205368] Modules linked in:[13090.209508]  ppdev lp tun autofs4 raid456 async_raid6_recov async_pq raid6_pq async_xor xor async_memcpy async_tx sata_mv kl5kusb105 ftdi_sio keyspan nfsd nfs lockd fscache auth_rpcgss nfs_acl sunrpc ipt_REJECT xt_state xt_tcpudp xt_LOG iptable_mangle iptable_filter deflate ctr twofish_generic twofish_x86_64_3way twofish_x86_64 twofish_common camellia_generic camellia_x86_64 serpent_sse2_x86_64 lrw serpent_generic xts gf128mul cast5 des_generic xcbc rmd160 sha512_generic crypto_null af_key xfrm_algo blowfish_generic blowfish_x86_64 blowfish_common dm_crypt dm_mirror dm_region_hash dm_log aes_x86_64 fuse lm85 hwmon_vid dm_snapshot dm_mod iptable_nat ip_tables nf_conntrack_ftp ipt_MASQUERADE nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 x_tables nf_conntrack sg st snd_pcm_oss snd_mixer_oss snd_hda_codec_hdmi snd_hda_codec_realtek rc_ati_x10 ati_remote rc_core pl2303 usbserial i915 snd_hda_intel snd_cmipci snd_hda_codec gameport drm_kms_helper dr!
 m !
>  snd_opl3_lib snd_mpu401_uart eeepc_wmi asus_wmi
>  i2c_algo_bit[13090.315877]  sparse_keymap rfkill snd_hwdep snd_seq_midi acpi_cpufreq snd_seq_midi_event mperf kvm_intel kvm processor snd_seq snd_pcm pci_hotplug ehci_hcd wmi parport_pc xhci_hcd microcode button video sata_sil24 parport snd_rawmidi snd_timer usbcore crc32c_intel ghash_clmulni_intel i2c_i801 snd_seq_device cryptd evdev snd lpc_ich mei i2c_core pcspkr snd_page_alloc thermal_sys usb_common soundcore coretemp r8169 mii tpm_tis tpm tpm_bios [last unloaded: kl5kusb105]
> 
> [13090.370146] Pid: 9658, comm: mount Not tainted 3.5.2-amd64-preempt-noide-20120903 #1 System manufacturer System Product Name/P8H67-M PRO
> [13090.387559] RIP: 0010:[<ffffffff8119b92f>]  [<ffffffff8119b92f>] ext4_ext_remove_space+0x83d/0xb51
> [13090.398254] RSP: 0018:ffff88012b4c7a18  EFLAGS: 00010246
> [13090.406241] RAX: 0000000000000000 RBX: ffff8800a41fb4e8 RCX: ffff8800a41fb450
> [13090.416102] RDX: 0000000000000001 RSI: 0000000000000002 RDI: 000000001b340000
> [13090.426003] RBP: ffff88012b4c7af8 R08: 000000001b340000 R09: ffff88008ae6f6e0
> [13090.435920] R10: ffff880000000000 R11: 0000000000000000 R12: ffff8801156e86f0
> [13090.445782] R13: 0000000000000000 R14: ffff8801156e86c0 R15: 0000000000000000
> [13090.455627] FS:  0000000000000000(0000) GS:ffff88013fa80000(0063) knlGS:00000000f75ae750
> [13090.466451] CS:  0010 DS: 002b ES: 002b CR0: 000000008005003b
> [13090.475010] CR2: 0000000000000028 CR3: 0000000115614000 CR4: 00000000000407e0
> [13090.484921] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [13090.494802] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> [13090.504649] Process mount (pid: 9658, threadinfo ffff88012b4c6000, task ffff88008d91c4c0)
> [13090.515567] Stack:
> [13090.520209]  ffff88012b4c7a28 ffffffff81175f65 ffff88012b4c7a88 ffffffff81179c44
> [13090.530426]  ffff880100001000 00000000fffffff5 ffffffffa41fb438 ffff8801156e8748
> [13090.540694]  00000000000a77ff ffff8800a41fb438 0000000008007800 ffff880122e67800
> [13090.551124] Call Trace:
> [13090.556238]  [<ffffffff81175f65>] ? brelse+0xe/0x10
> [13090.564018]  [<ffffffff81179c44>] ? ext4_mark_iloc_dirty+0x51c/0x581
> [13090.573175]  [<ffffffff8119d51c>] ext4_ext_truncate+0xcd/0x179
> [13090.581856]  [<ffffffff81132b1c>] ? __inode_wait_for_writeback+0x67/0xa9
> [13090.591316]  [<ffffffff81177e74>] ext4_truncate+0x9c/0xdf
> [13090.599434]  [<ffffffff8117b721>] ext4_evict_inode+0x1e9/0x2d6
> [13090.608273]  [<ffffffff811282e3>] evict+0xa8/0x162
> [13090.615846]  [<ffffffff81128588>] iput+0x1b3/0x1bb
> [13090.623284]  [<ffffffff8119570d>] ext4_fill_super+0x214b/0x256b
> [13090.631785]  [<ffffffff8128f835>] ? vsnprintf+0x1ce/0x421
> [13090.639778]  [<ffffffff8113f9b2>] ? set_blocksize+0x36/0x86
> [13090.647864]  [<ffffffff811169ae>] mount_bdev+0x14b/0x1ad
> [13090.655707]  [<ffffffff811935c2>] ? ext4_calculate_overhead+0x247/0x247
> [13090.664876]  [<ffffffff8112ada7>] ? alloc_vfsmnt+0xa6/0x198
> [13090.672989]  [<ffffffff81184d5f>] ext4_mount+0x10/0x12
> [13090.680564]  [<ffffffff81117390>] mount_fs+0x64/0x150
> [13090.687944]  [<ffffffff810e5439>] ? __alloc_percpu+0xb/0xd
> [13090.695702]  [<ffffffff8112b156>] vfs_kern_mount+0x64/0xde
> [13090.703435]  [<ffffffff8112b544>] do_kern_mount+0x48/0xda
> [13090.711023]  [<ffffffff8112ce32>] do_mount+0x6a1/0x704
> [13090.718294]  [<ffffffff810e1181>] ? memdup_user+0x38/0x60
> [13090.725767]  [<ffffffff810e11df>] ? strndup_user+0x36/0x4c
> [13090.733260]  [<ffffffff8114ffaa>] compat_sys_mount+0x208/0x242
> [13090.741047]  [<ffffffff814b0b06>] sysenter_dispatch+0x7/0x21
> [13090.748612] Code: ff 4c 63 65 b8 4d 6b e4 30 4c 03 65 b0 e9 fd 00 00 00 48 63 55 b8 4c 6b e2 30 4c 03 65 b0 49 83 7c 24 20 00 75 0e 49 8b 44 24 28 <48> 8b 40 28 49 89 44 24 20 49 8b 44 24 18 48 85 c0 75 22 49 8b 
> [13090.772841] RIP  [<ffffffff8119b92f>] ext4_ext_remove_space+0x83d/0xb51
> [13090.781438]  RSP <ffff88012b4c7a18>
> [13090.786758] CR2: 0000000000000028
> [13090.804674] ---[ end trace 880c73500bb7f09f ]---
> [13090.810808] Kernel panic - not syncing: Fatal exception
> [13090.817346] panic occurred, switching back to text console
> [13090.824556] Rebooting in 20 seconds..
> [13110.758740] ACPI MEMORY or I/O RESET_REG.
> 
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