On 16 April 2013 15:37, Daniel J Blueman <daniel@xxxxxxxxx> wrote: > When using e4defrag on a ext4 filesystem created a month ago, I ran > into this fatal page fault [1] > while running e4defrag on 3.9-rc6 (Ubuntu mainline). > > e2fsdump output is at http://quora.org/2012/e2fsdump.txt ; let me know > if you need any more info. With 3.9.6 mainline, I got the exact same protection fault at free_rb_tree_fname() from ext4_htree_free_dir_info() [1]. This suggests use-after-free, as there's no pagetable mapping. There is nothing special with my setups, so there is fair chance it's reproducible there with e4defrag on a few month old filesystem and recent kernels. Thanks, Daniel > --- [1] > > general protection fault: 0000 [#1] SMP > Modules linked in: btrfs raid6_pq zlib_deflate xor ufs qnx4 hfsplus > hfs minix ntfs msdos jfs xfs libcrc32c reiserfs ext2 8021q garp > parport_pc ppdev rfcomm bnep nfsd auth_rpcgss nfs_acl nfs lockd sunrpc > fscache snd_hda_codec_hdmi snd_hda_codec_realtek coretemp kvm_intel > kvm snd_hda_intel snd_hda_codec snd_hwdep ghash_clmulni_intel arc4 > bridge iwldvm joydev i915 cryptd snd_pcm mac80211 stp llc > snd_page_alloc drm_kms_helper drm snd_seq_midi snd_seq_midi_event > snd_rawmidi snd_seq psmouse snd_seq_device btusb ir_sony_decoder > ir_rc5_decoder ir_lirc_codec lirc_dev ir_sanyo_decoder > ir_mce_kbd_decoder ir_jvc_decoder serio_raw ir_rc6_decoder iwlwifi > ir_nec_decoder snd_timer i2c_algo_bit rc_rc6_mce microcode nuvoton_cir > snd rc_core bluetooth soundcore mac_hid cfg80211 mei lpc_ich video lp > parport hid_generic usbhid hid r8169 ahci libahci > CPU 0 > Pid: 18139, comm: e4defrag Not tainted 3.9.0-030900rc6-generic > #201304080035 ZOTAC XXXXXX/XXXXXX > RIP: 0010:[<ffffffff81238188>] [<ffffffff81238188>] free_rb_tree_fname+0x28/0xb0 > RSP: 0018:ffff8801134a9e28 EFLAGS: 00010202 > RAX: 0036b44b00008001 RBX: ffff880080e09018 RCX: 0000000180400028 > RDX: 0036b44b00008001 RSI: 0000000000000001 RDI: ffff88013b001700 > RBP: ffff8801134a9e48 R08: 0000000000000000 R09: ffffea0000dbe380 > R10: ffffffff812381bc R11: 0000000000000206 R12: 0000000000000000 > R13: ffff880036f8ec80 R14: ffff880036f8ebc8 R15: ffff8800ade074c0 > FS: 00007fd1923d7740(0000) GS:ffff88013fa00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00000000013974d8 CR3: 00000001352f2000 CR4: 00000000000407f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 > Process e4defrag (pid: 18139, threadinfo ffff8801134a8000, task > ffff880138d9c5f0) > Stack: > ffff880036f8ec80 0000000040000010 ffff880021a2f900 ffff8800ade074c0 > ffff8801134a9e68 ffffffff81238f36 0000000040000010 ffff88013890f000 > ffff8801134a9e78 ffffffff81238f6a ffff8801134a9ec8 ffffffff8119f57a > Call Trace: > [<ffffffff81238f36>] ext4_htree_free_dir_info+0x16/0x30 > [<ffffffff81238f6a>] ext4_release_dir+0x1a/0x20 > [<ffffffff8119f57a>] __fput+0xba/0x240 > [<ffffffff8119f70e>] ____fput+0xe/0x10 > [<ffffffff8107ca58>] task_work_run+0xc8/0xf0 > [<ffffffff81014d7a>] do_notify_resume+0xaa/0xc0 > [<ffffffff8170d0da>] int_signal+0x12/0x17 > Code: 90 90 90 66 66 66 66 90 55 48 89 e5 41 56 41 55 49 89 fd 41 54 > 53 48 8b 1f 48 85 db 74 67 48 8b 43 10 eb 11 0f 1f 80 00 00 00 00 <48> > 8b 50 10 48 89 c3 48 89 d0 48 85 c0 75 f1 48 8b 43 08 48 85 > RIP [<ffffffff81238188>] free_rb_tree_fname+0x28/0xb0 > RSP <ffff8801134a9e28> > ---[ end trace 02741f61e6b3c24b ]--- > general protection fault: 0000 [#2] SMP > Modules linked in: btrfs raid6_pq zlib_deflate xor ufs qnx4 hfsplus > hfs minix ntfs msdos jfs xfs libcrc32c reiserfs ext2 8021q garp > parport_pc ppdev rfcomm bnep nfsd auth_rpcgss nfs_acl nfs lockd sunrpc > fscache snd_hda_codec_hdmi snd_hda_codec_realtek coretemp kvm_intel > kvm snd_hda_intel snd_hda_codec snd_hwdep ghash_clmulni_intel arc4 > bridge iwldvm joydev i915 cryptd snd_pcm mac80211 stp llc > snd_page_alloc drm_kms_helper drm snd_seq_midi snd_seq_midi_event > snd_rawmidi snd_seq psmouse snd_seq_device btusb ir_sony_decoder > ir_rc5_decoder ir_lirc_codec lirc_dev ir_sanyo_decoder > ir_mce_kbd_decoder ir_jvc_decoder serio_raw ir_rc6_decoder iwlwifi > ir_nec_decoder snd_timer i2c_algo_bit rc_rc6_mce microcode nuvoton_cir > snd rc_core bluetooth soundcore mac_hid cfg80211 mei lpc_ich video lp > parport hid_generic usbhid hid r8169 ahci libahci > CPU 0 > Pid: 18139, comm: e4defrag Tainted: G D 3.9.0-030900rc6-generic > #201304080035 ZOTAC XXXXXX/XXXXXX > RIP: 0010:[<ffffffff81238188>] [<ffffffff81238188>] free_rb_tree_fname+0x28/0xb0 > RSP: 0018:ffff8801134a9b78 EFLAGS: 00010202 > RAX: 0036b44b00008001 RBX: ffff880080e09018 RCX: 0000000000000001 > RDX: 0036b44b00008001 RSI: ffff88013890fb00 RDI: ffff880036f8ef80 > RBP: ffff8801134a9b98 R08: 0000000000000000 R09: 0000000000000000 > R10: ffff88013890fb10 R11: 0000000000000000 R12: 0000000040000010 > R13: ffff880036f8ef80 R14: ffff8800ade07108 R15: ffff8800ade07108 > FS: 0000000000000000(0000) GS:ffff88013fa00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f718650aed4 CR3: 0000000001c0d000 CR4: 00000000000407f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 > Process e4defrag (pid: 18139, threadinfo ffff8801134a8000, task > ffff880138d9c5f0) > Stack: > ffff880036f8ef80 0000000040000010 ffff880021a2fb40 ffff8800ade07108 > ffff8801134a9bb8 ffffffff81238f36 0000000040000010 ffff88013890fb00 > ffff8801134a9bc8 ffffffff81238f6a ffff8801134a9c18 ffffffff8119f57a > Call Trace: > [<ffffffff81238f36>] ext4_htree_free_dir_info+0x16/0x30 > [<ffffffff81238f6a>] ext4_release_dir+0x1a/0x20 > [<ffffffff8119f57a>] __fput+0xba/0x240 > [<ffffffff8119f70e>] ____fput+0xe/0x10 > [<ffffffff8107ca58>] task_work_run+0xc8/0xf0 > [<ffffffff81060876>] do_exit+0x196/0x480 > [<ffffffff81705329>] oops_end+0xb9/0x100 > [<ffffffff81017d88>] die+0x58/0x90 > [<ffffffff81704d9c>] do_general_protection+0xdc/0x160 > [<ffffffff81704728>] general_protection+0x28/0x30 > [<ffffffff812381bc>] ? free_rb_tree_fname+0x5c/0xb0 > [<ffffffff81238188>] ? free_rb_tree_fname+0x28/0xb0 > [<ffffffff812381bc>] ? free_rb_tree_fname+0x5c/0xb0 > [<ffffffff81238f36>] ext4_htree_free_dir_info+0x16/0x30 > [<ffffffff81238f6a>] ext4_release_dir+0x1a/0x20 > [<ffffffff8119f57a>] __fput+0xba/0x240 > [<ffffffff8119f70e>] ____fput+0xe/0x10 > [<ffffffff8107ca58>] task_work_run+0xc8/0xf0 > [<ffffffff81014d7a>] do_notify_resume+0xaa/0xc0 > [<ffffffff8170d0da>] int_signal+0x12/0x17 > Code: 90 90 90 66 66 66 66 90 55 48 89 e5 41 56 41 55 49 89 fd 41 54 > 53 48 8b 1f 48 85 db 74 67 48 8b 43 10 eb 11 0f 1f 80 00 00 00 00 <48> > 8b 50 10 48 89 c3 48 89 d0 48 85 c0 75 f1 48 8b 43 08 48 85 > RIP [<ffffffff81238188>] free_rb_tree_fname+0x28/0xb0 > RSP <ffff8801134a9b78> > ---[ end trace 02741f61e6b3c24c ]--- > Fixing recursive fault but reboot is needed! -- Daniel J Blueman -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
