On Thu 04-07-13 13:31:30, Dustin Lundquist wrote:
> I've narrowed this down a bit more: this seems to only occur when a
> program attempts to core dump when run within ecryptfs mount. I've
> been able to reliably reproduce it with: int main() { assert(0); };
>
> Additionally my earlier report that I'm not able to access any local
> files was incorrect: it seems to be limited to the directory which
> the program attempted to core dump in.
>
> I've update my kernel with WARN_ON(irqs_disabled()); in
> ext4_lookup(), ext4_find_entry() and ecryptfs_lookup() and then only
> received the following:
Hum, so it's interesting that ecryptfs_lookup() WARN_ON() didn't trigger
but ext4 one did. Strangely enough I don't see a place in the call chain
where irqs could get disabled. Can you maybe trace using irq tracing at
which point exactly do we disable interrupts?
Honza
>
> >[ 71.368060] ------------[ cut here ]------------
> >[ 71.368107] WARNING: at fs/ext4/namei.c:1420 ext4_lookup+0x2a/0x126 [ext4]()
> >[ 71.368110] Modules linked in: hidp hid fuse ecb ip6table_filter ip6_tables ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle xt_tcpudp iptable_filter ip_tables x_tables bridge stp llc parport_pc ppdev lp parport cpufreq_conservative cpufreq_powersave cpufreq_stats cpufreq_userspace rfcomm bnep binfmt_misc uinput loop ecryptfs uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core videodev btusb bluetooth snd_hda_codec_hdmi snd_hda_codec_realtek joydev coretemp kvm_intel kvm crc32c_intel ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd iTCO_wdt iTCO_vendor_support arc4 iwldvm snd_hda_intel snd_hda_codec mac80211 snd_hwdep thinkpad_acpi snd_pcm pcspkr snd_page_alloc nvram snd_seq snd_timer snd_seq_device iwlwifi microcode i915 ehci_pci psmouse snd serio_raw evdev i2c_i801 drm_kms_helper ehci_hcd cfg80211 lpc_ich mfd_core s
> oundcore drm rfkill battery i2c_algo_bit ac i2c_core wmi video
> acpi_cpufreq mperf processor button ext4 crc16 jbd2 mbcache dm_mod
> sg sd_mod crc_t10dif sdhci_pci ahci sdhci libahci mmc_core libata
> e1000e ptp pps_core scsi_mod xhci_hcd usbcore usb_common thermal
> thermal_sys
> >[ 71.368216] CPU: 3 PID: 4560 Comm: test_assert Not tainted 3.10.0 #3
> >[ 71.368219] Hardware name: LENOVO 2306CTO/2306CTO, BIOS G2ET94WW (2.54 ) 04/30/2013
> >[ 71.368222] ffffffff8136cf25 0000000000000000 ffffffff8102fbad 0000000000000000
> >[ 71.368228] 0000000000000000 ffff8803d4cbf988 ffff8803f48fbc70 ffff8803d9903900
> >[ 71.368232] ffff8803d4decac0 ffff8803f30468c0 ffffffffa01575ee ffff8803f30468c0
> >[ 71.368237] Call Trace:
> >[ 71.368247] [<ffffffff8136cf25>] ? dump_stack+0xd/0x17
> >[ 71.368255] [<ffffffff8102fbad>] ? warn_slowpath_common+0x5f/0x77
> >[ 71.368271] [<ffffffffa01575ee>] ? ext4_lookup+0x2a/0x126 [ext4]
> >[ 71.368277] [<ffffffff8110f59f>] ? spin_unlock+0x5/0x6
> >[ 71.368282] [<ffffffff8111141e>] ? d_alloc+0x61/0x69
> >[ 71.368288] [<ffffffff81107f5d>] ? lookup_real+0x24/0x3f
> >[ 71.368293] [<ffffffff811083a4>] ? __lookup_hash+0x2a/0x31
> >[ 71.368298] [<ffffffff8110bffe>] ? lookup_one_len+0xd3/0xe5
> >[ 71.368306] [<ffffffffa05c81f9>] ? ecryptfs_lookup+0x117/0x2eb [ecryptfs]
> >[ 71.368311] [<ffffffff81107f5d>] ? lookup_real+0x24/0x3f
> >[ 71.368316] [<ffffffff8110b6e9>] ? do_last+0x509/0xa16
> >[ 71.368321] [<ffffffff81109492>] ? __inode_permission+0x2f/0x95
> >[ 71.368327] [<ffffffff8110bcba>] ? path_openat+0xc4/0x335
> >[ 71.368333] [<ffffffff810cb77c>] ? __inc_zone_state+0x3f/0x47
> >[ 71.368338] [<ffffffff8110c1d6>] ? do_filp_open+0x2a/0x6e
> >[ 71.368345] [<ffffffff81141c6e>] ? cn_printf+0xda/0xea
> >[ 71.368350] [<ffffffff810ffc2b>] ? file_open_name+0x27/0x2d
> >[ 71.368354] [<ffffffff810ffc53>] ? filp_open+0x22/0x27
> >[ 71.368359] [<ffffffff811424dc>] ? do_coredump+0x85e/0xbe6
> >[ 71.368366] [<ffffffff810b61cc>] ? find_get_page+0x3e/0x5f
> >[ 71.368373] [<ffffffff8136f4c9>] ? _cond_resched+0x6/0x1a
> >[ 71.368380] [<ffffffff8103f892>] ? get_signal_to_deliver+0x46a/0x4a5
> >[ 71.368385] [<ffffffff8103db63>] ? signal_wake_up_state+0x1e/0x31
> >[ 71.368390] [<ffffffff8100214a>] ? do_signal+0x3c/0x504
> >[ 71.368395] [<ffffffff81002637>] ? do_notify_resume+0x25/0x68
> >[ 71.368400] [<ffffffff81370ca2>] ? int_signal+0x12/0x17
> >[ 71.368403] ---[ end trace c3af132f2e9b580b ]---
> >[ 71.368405] ------------[ cut here ]------------
> >[ 71.368417] WARNING: at fs/ext4/namei.c:1235 ext4_find_entry+0x3d/0x3e3 [ext4]()
> >[ 71.368419] Modules linked in: hidp hid fuse ecb ip6table_filter ip6_tables ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle xt_tcpudp iptable_filter ip_tables x_tables bridge stp llc parport_pc ppdev lp parport cpufreq_conservative cpufreq_powersave cpufreq_stats cpufreq_userspace rfcomm bnep binfmt_misc uinput loop ecryptfs uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core videodev btusb bluetooth snd_hda_codec_hdmi snd_hda_codec_realtek joydev coretemp kvm_intel kvm crc32c_intel ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd iTCO_wdt iTCO_vendor_support arc4 iwldvm snd_hda_intel snd_hda_codec mac80211 snd_hwdep thinkpad_acpi snd_pcm pcspkr snd_page_alloc nvram snd_seq snd_timer snd_seq_device iwlwifi microcode i915 ehci_pci psmouse snd serio_raw evdev i2c_i801 drm_kms_helper ehci_hcd cfg80211 lpc_ich mfd_core s
> oundcore drm rfkill battery i2c_algo_bit ac i2c_core wmi video
> acpi_cpufreq mperf processor button ext4 crc16 jbd2 mbcache dm_mod
> sg sd_mod crc_t10dif sdhci_pci ahci sdhci libahci mmc_core libata
> e1000e ptp pps_core scsi_mod xhci_hcd usbcore usb_common thermal
> thermal_sys
> >[ 71.368517] CPU: 3 PID: 4560 Comm: test_assert Tainted: G W 3.10.0 #3
> >[ 71.368519] Hardware name: LENOVO 2306CTO/2306CTO, BIOS G2ET94WW (2.54 ) 04/30/2013
> >[ 71.368521] ffffffff8136cf25 0000000000000000 ffffffff8102fbad ffffffff818b8682
> >[ 71.368526] 0000000000000000 00000000d4cbf828 ffff8803f48fbc70 ffff8803d4decb40
> >[ 71.368530] ffff8803d4decac0 0000000000000000 ffffffffa015721e ffff8803d4cbf8f0
> >[ 71.368535] Call Trace:
> >[ 71.368539] [<ffffffff8136cf25>] ? dump_stack+0xd/0x17
> >[ 71.368544] [<ffffffff8102fbad>] ? warn_slowpath_common+0x5f/0x77
> >[ 71.368560] [<ffffffffa015721e>] ? ext4_find_entry+0x3d/0x3e3 [ext4]
> >[ 71.368577] [<ffffffffa01575ee>] ? ext4_lookup+0x2a/0x126 [ext4]
> >[ 71.368592] [<ffffffffa01575ee>] ? ext4_lookup+0x2a/0x126 [ext4]
> >[ 71.368597] [<ffffffff8102fbb2>] ? warn_slowpath_common+0x64/0x77
> >[ 71.368612] [<ffffffffa0157615>] ? ext4_lookup+0x51/0x126 [ext4]
> >[ 71.368616] [<ffffffff8110f59f>] ? spin_unlock+0x5/0x6
> >[ 71.368620] [<ffffffff8111141e>] ? d_alloc+0x61/0x69
> >[ 71.368625] [<ffffffff81107f5d>] ? lookup_real+0x24/0x3f
> >[ 71.368629] [<ffffffff811083a4>] ? __lookup_hash+0x2a/0x31
> >[ 71.368635] [<ffffffff8110bffe>] ? lookup_one_len+0xd3/0xe5
> >[ 71.368642] [<ffffffffa05c81f9>] ? ecryptfs_lookup+0x117/0x2eb [ecryptfs]
> >[ 71.368647] [<ffffffff81107f5d>] ? lookup_real+0x24/0x3f
> >[ 71.368652] [<ffffffff8110b6e9>] ? do_last+0x509/0xa16
> >[ 71.368657] [<ffffffff81109492>] ? __inode_permission+0x2f/0x95
> >[ 71.368662] [<ffffffff8110bcba>] ? path_openat+0xc4/0x335
> >[ 71.368667] [<ffffffff810cb77c>] ? __inc_zone_state+0x3f/0x47
> >[ 71.368672] [<ffffffff8110c1d6>] ? do_filp_open+0x2a/0x6e
> >[ 71.368678] [<ffffffff81141c6e>] ? cn_printf+0xda/0xea
> >[ 71.368682] [<ffffffff810ffc2b>] ? file_open_name+0x27/0x2d
> >[ 71.368686] [<ffffffff810ffc53>] ? filp_open+0x22/0x27
> >[ 71.368691] [<ffffffff811424dc>] ? do_coredump+0x85e/0xbe6
> >[ 71.368696] [<ffffffff810b61cc>] ? find_get_page+0x3e/0x5f
> >[ 71.368701] [<ffffffff8136f4c9>] ? _cond_resched+0x6/0x1a
> >[ 71.368707] [<ffffffff8103f892>] ? get_signal_to_deliver+0x46a/0x4a5
> >[ 71.368711] [<ffffffff8103db63>] ? signal_wake_up_state+0x1e/0x31
> >[ 71.368716] [<ffffffff8100214a>] ? do_signal+0x3c/0x504
> >[ 71.368721] [<ffffffff81002637>] ? do_notify_resume+0x25/0x68
> >[ 71.368724] [<ffffffff81370ca2>] ? int_signal+0x12/0x17
> >[ 71.368727] ---[ end trace c3af132f2e9b580c ]---
> >[ 71.368741] ------------[ cut here ]------------
> >[ 71.368806] kernel BUG at fs/buffer.c:1234!
> >[ 71.368859] invalid opcode: 0000 [#1] SMP
> >[ 71.368916] Modules linked in: hidp hid fuse ecb ip6table_filter ip6_tables ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle xt_tcpudp iptable_filter ip_tables x_tables bridge stp llc parport_pc ppdev lp parport cpufreq_conservative cpufreq_powersave cpufreq_stats cpufreq_userspace rfcomm bnep binfmt_misc uinput loop ecryptfs uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core videodev btusb bluetooth snd_hda_codec_hdmi snd_hda_codec_realtek joydev coretemp kvm_intel kvm crc32c_intel ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd iTCO_wdt iTCO_vendor_support arc4 iwldvm snd_hda_intel snd_hda_codec mac80211 snd_hwdep thinkpad_acpi snd_pcm pcspkr snd_page_alloc nvram snd_seq snd_timer snd_seq_device iwlwifi microcode i915 ehci_pci psmouse snd serio_raw evdev i2c_i801 drm_kms_helper ehci_hcd cfg80211 lpc_ich mfd_core s
> oundcore drm rfkill battery i2c_algo_bit ac i2c_core wmi video
> acpi_cpufreq mperf processor button ext4 crc16 jbd2 mbcache dm_mod
> sg sd_mod crc_t10dif sdhci_pci ahci sdhci libahci mmc_core libata
> e1000e ptp pps_core scsi_mod xhci_hcd usbcore usb_common thermal
> thermal_sys
> >[ 71.370597] CPU: 3 PID: 4560 Comm: test_assert Tainted: G W 3.10.0 #3
> >[ 71.370685] Hardware name: LENOVO 2306CTO/2306CTO, BIOS G2ET94WW (2.54 ) 04/30/2013
> >[ 71.370777] task: ffff8804097055e0 ti: ffff8803d4cbe000 task.ti: ffff8803d4cbe000
> >[ 71.370868] RIP: 0010:[<ffffffff81123bfa>] [<ffffffff81123bfa>] check_irqs_on+0x7/0xa
> >[ 71.370971] RSP: 0018:ffff8803d4cbf540 EFLAGS: 00010046
> >[ 71.371037] RAX: 0000000000000096 RBX: 0000000000001000 RCX: 0000000000000000
> >[ 71.371122] RDX: 0000000000001000 RSI: 0000000000a8207b RDI: ffff88041d7c7740
> >[ 71.371208] RBP: ffff88041d7c7740 R08: 0000000001400000 R09: 0000000000000000
> >[ 71.371294] R10: 0000000000000000 R11: ffffffff814dae00 R12: 0000000000a8207b
> >[ 71.371380] R13: 0000000000000001 R14: 0000000000a8207b R15: 0000000000000000
> >[ 71.371467] FS: 00007f3a5c944700(0000) GS:ffff88041e2c0000(0000) knlGS:0000000000000000
> >[ 71.371565] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> >[ 71.371634] CR2: 00007f3a5c425070 CR3: 00000003f346f000 CR4: 00000000001407e0
> >[ 71.371720] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> >[ 71.371806] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> >[ 71.371891] Stack:
> >[ 71.371917] ffffffff81123e41 0000000000000001 ffff8803f3fe8358 ffff8803d4cbf5b0
> >[ 71.372017] ffffffffa014e10d ffff8803d4cbf6b4 ffff8803d4cbf630 ffff8803d4cbf630
> >[ 71.372117] ffff8803f48fbc70 0000000000000000 ffff8803d4cbf6b4 0000000000001000
> >[ 71.372217] Call Trace:
> >[ 71.372253] [<ffffffff81123e41>] ? __find_get_block+0x17/0x162
> >[ 71.372341] [<ffffffffa014e10d>] ? __check_block_validity.constprop.53+0x27/0x65 [ext4]
> >[ 71.372441] [<ffffffff81124b7d>] ? __getblk+0x1b/0x275
> >[ 71.372519] [<ffffffffa014fc55>] ? ext4_getblk+0x9b/0x15d [ext4]
> >[ 71.372596] [<ffffffff8136ff4d>] ? _raw_spin_trylock+0x5/0x13
> >[ 71.372681] [<ffffffffa014fd24>] ? ext4_bread+0xd/0x61 [ext4]
> >[ 71.372755] [<ffffffff81031549>] ? console_unlock+0x2c6/0x303
> >[ 71.372839] [<ffffffffa0155f2f>] ? __ext4_read_dirblock+0x35/0x251 [ext4]
> >[ 71.372935] [<ffffffffa015636c>] ? dx_probe+0x38/0x308 [ext4]
> >[ 71.373008] [<ffffffff81005039>] ? show_trace_log_lvl+0x2c/0x56
> >[ 71.373094] [<ffffffffa01570cc>] ? ext4_dx_find_entry+0x3d/0x152 [ext4]
> >[ 71.373179] [<ffffffff8136a902>] ? printk+0x4f/0x54
> >[ 71.373252] [<ffffffffa015721e>] ? ext4_find_entry+0x3d/0x3e3 [ext4]
> >[ 71.373333] [<ffffffff8102fbb2>] ? warn_slowpath_common+0x64/0x77
> >[ 71.373421] [<ffffffffa0157313>] ? ext4_find_entry+0x132/0x3e3 [ext4]
> >[ 71.373515] [<ffffffffa01575ee>] ? ext4_lookup+0x2a/0x126 [ext4]
> >[ 71.373601] [<ffffffffa01575ee>] ? ext4_lookup+0x2a/0x126 [ext4]
> >[ 71.376994] [<ffffffff8102fbb2>] ? warn_slowpath_common+0x64/0x77
> >[ 71.380410] [<ffffffffa0157615>] ? ext4_lookup+0x51/0x126 [ext4]
> >[ 71.383809] [<ffffffff8110f59f>] ? spin_unlock+0x5/0x6
> >[ 71.387089] [<ffffffff81107f5d>] ? lookup_real+0x24/0x3f
> >[ 71.390236] [<ffffffff811083a4>] ? __lookup_hash+0x2a/0x31
> >[ 71.393253] [<ffffffff8110bffe>] ? lookup_one_len+0xd3/0xe5
> >[ 71.396152] [<ffffffffa05c81f9>] ? ecryptfs_lookup+0x117/0x2eb [ecryptfs]
> >[ 71.398948] [<ffffffff81107f5d>] ? lookup_real+0x24/0x3f
> >[ 71.401614] [<ffffffff8110b6e9>] ? do_last+0x509/0xa16
> >[ 71.404152] [<ffffffff81109492>] ? __inode_permission+0x2f/0x95
> >[ 71.406579] [<ffffffff8110bcba>] ? path_openat+0xc4/0x335
> >[ 71.408960] [<ffffffff810cb77c>] ? __inc_zone_state+0x3f/0x47
> >[ 71.411307] [<ffffffff8110c1d6>] ? do_filp_open+0x2a/0x6e
> >[ 71.413623] [<ffffffff81141c6e>] ? cn_printf+0xda/0xea
> >[ 71.415889] [<ffffffff810ffc2b>] ? file_open_name+0x27/0x2d
> >[ 71.418123] [<ffffffff810ffc53>] ? filp_open+0x22/0x27
> >[ 71.420317] [<ffffffff811424dc>] ? do_coredump+0x85e/0xbe6
> >[ 71.422516] [<ffffffff810b61cc>] ? find_get_page+0x3e/0x5f
> >[ 71.424701] [<ffffffff8136f4c9>] ? _cond_resched+0x6/0x1a
> >[ 71.426876] [<ffffffff8103f892>] ? get_signal_to_deliver+0x46a/0x4a5
> >[ 71.429073] [<ffffffff8103db63>] ? signal_wake_up_state+0x1e/0x31
> >[ 71.431238] [<ffffffff8100214a>] ? do_signal+0x3c/0x504
> >[ 71.433364] [<ffffffff81002637>] ? do_notify_resume+0x25/0x68
> >[ 71.435483] [<ffffffff81370ca2>] ? int_signal+0x12/0x17
> >[ 71.437588] Code: db b6 6d 48 c1 fe 03 48 0f af f0 48 b8 00 00 00 00 00 88 ff ff 48 c1 e6 0c 48 01 c6 48 01 f2 48 89 57 28 c3 9c 58 f6 c4 02 75 02 <0f> 0b c3 55 48 c7 c5 60 f3 00 00 83 c8 ff 53 31 db 41 52 65 c7
> >[ 71.442432] RIP [<ffffffff81123bfa>] check_irqs_on+0x7/0xa
> >[ 71.444766] RSP <ffff8803d4cbf540>
> >[ 71.463545] ---[ end trace c3af132f2e9b580d ]---
>
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--
Jan Kara <jack@xxxxxxx>
SUSE Labs, CR
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