Re: reiser4: BUG during a backup (sequentially reading the whole fs) on 4.9

[Edward Shishkin <edward.shishkin@gmail.com>]

There are 4 patches for 4.9. Which one do you use?
Or please provide commit id, if you use git.

Thanks,
Edward.

On 02/27/2017 05:01 PM, Ivan Shapovalov wrote:
> Hi,
>
> I've just encountered this crash when I was doing a full-fs backup
> (linux 4.9):
>
> [ 3125.760693] BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
> [ 3125.760722] IP: [<ffffffffc075cf91>] internal_at+0x1/0x30 [reiser4]
> [ 3125.760749] PGD 1dc4d8067
> [ 3125.760756] PUD 119275067
> [ 3125.760764] PMD 0
>
> [ 3125.760772] Oops: 0000 [#1] PREEMPT SMP
> [ 3125.760782] Modules linked in: ext4 jbd2 mbcache ctr ccm fuse cmac arc4 acpi_call(O) bnep ipheth btusb uvcvideo btintel bluetooth videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core videodev uas crc16 bbswitch(O) coretemp i
> ntel_rapl x86_pkg_temp_thermal intel_powerclamp snd_hda_codec_realtek kvm_intel snd_hda_codec_generic mei_wdt snd_hda_codec_hdmi kvm irqbypass crc32_pclmul ghash_clmulni_intel iTCO_wdt aesni_intel iTCO_vendor_support aes_x86_64 lrw gf128mul ath10k_pci snd_hda_intel glue_helper ath10k_core snd_hda_codec ablk_helper cryptd ath mac80211 cfg80211 psmouse snd_hwdep snd_hda_core thinkpad_acpi input_leds pcspkr e1000e i2c_i801 snd_pcm i2c_smbus nvram mei_me snd_timer mei rtsx_pci_ms lpc_ich snd memstick ptp led_class pps_core tpm_tis hwmon tpm_tis_core rfkill wmi soundcore
> [ 3125.761006]  thermal ac tpm evdev battery sch_fq_codel vboxnetflt(O) vboxnetadp(O) vboxpci(O) vboxdrv(O) usbserial usbip_host usbip_core sg efivarfs ip_tables x_tables autofs4 reiser4 sd_mod hid_logitech_hidpp hid_logitech_dj usbhid hid usb_storage rtsx_pci_sdmmc mmc_core crc32c_intel ahci libahci libata xhci_pci serio_raw ehci_pci scsi_mod xhci_hcd ehci_hcd rtsx_pci mfd_core usbcore usb_common i915 video backlight button intel_gtt i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops drm agpgart
> [ 3125.761152] CPU: 2 PID: 8033 Comm: borg Tainted: G           O    4.9.0-pf5-intelfx-00118-g3ef102e15022 #1
> [ 3125.761173] Hardware name: LENOVO 20BEA008RT/20BEA008RT, BIOS GMET75WW (2.23 ) 03/16/2016
> [ 3125.761191] task: ffff9a35d33aa4c0 task.stack: ffffaf93c3fac000
> [ 3125.761205] RIP: 0010:[<ffffffffc075cf91>]  [<ffffffffc075cf91>] internal_at+0x1/0x30 [reiser4]
> [ 3125.761231] RSP: 0018:ffffaf93c3faf978  EFLAGS: 00010202
> [ 3125.761243] RAX: 00000000000003a8 RBX: ffffaf93c3faf9d8 RCX: ffffffffc0774980
> [ 3125.761259] RDX: ffff9a3601130000 RSI: ffffaf93c3faf9d8 RDI: 0000000000000000
> [ 3125.761275] RBP: ffff9a35886035a0 R08: 0000000000000000 R09: 0000000000000000
> [ 3125.761291] R10: ffffffffc0750300 R11: 0000000000000000 R12: ffffaf93c3fafb40
> [ 3125.761308] R13: 0000000000000001 R14: ffffaf93c3faf9d8 R15: 0000000000000000
> [ 3125.761324] FS:  00007f71f7e82400(0000) GS:ffff9a373e280000(0000) knlGS:0000000000000000
> [ 3125.761342] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 3125.761355] CR2: 0000000000000010 CR3: 0000000215878000 CR4: 00000000001406e0
> [ 3125.761371] Stack:
> [ 3125.761377]  ffffaf93c3faf9d8 ffffffffc075d149 ffff9a3601130000 ffffffffc07519b0
> [ 3125.761397]  ffffaf93c3faf9d8 000000000000000f ffff9a3601130010 ffffd79000000001
> [ 3125.761417]  00000000006f7534 0043616e6f6e2057 000000000006f75f ffffffffffffffff
> [ 3125.761437] Call Trace:
> [ 3125.761449]  [<ffffffffc075d149>] ? has_pointer_to_internal+0x9/0x20 [reiser4]
> [ 3125.761471]  [<ffffffffc07519b0>] ? find_disk_cluster+0x190/0x3a0 [reiser4]
> [ 3125.761492]  [<ffffffffc075f265>] ? do_readpage_ctail+0x235/0x490 [reiser4]
> [ 3125.761511]  [<ffffffffc0751dd8>] ? prepare_page_cluster+0x178/0x270 [reiser4]
> [ 3125.761531]  [<ffffffffc075f5a5>] ? ctail_readpages_filler+0xe5/0x250 [reiser4]
> [ 3125.761549]  [<ffffffffa1123153>] ? read_cache_pages+0xb3/0x180
> [ 3125.761567]  [<ffffffffc075f4c0>] ? do_readpage_ctail+0x490/0x490 [reiser4]
> [ 3125.761584]  [<ffffffffa1174657>] ? __kmalloc+0x167/0x1d0
> [ 3125.761602]  [<ffffffffc075f963>] ? readpages_ctail+0x133/0x340 [reiser4]
> [ 3125.761621]  [<ffffffffc0753e44>] ? readpages_cryptcompress+0x34/0x60 [reiser4]
> [ 3125.761638]  [<ffffffffa11233d7>] ? __do_page_cache_readahead+0x1b7/0x2a0
> [ 3125.761655]  [<ffffffffa1123588>] ? ondemand_readahead+0xc8/0x240
> [ 3125.761670]  [<ffffffffa1113a0b>] ? pagecache_get_page+0x2b/0x2a0
> [ 3125.761685]  [<ffffffffa1116729>] ? generic_file_read_iter+0x619/0x880
> [ 3125.761701]  [<ffffffffa11959d2>] ? new_sync_read+0xd2/0x120
> [ 3125.761718]  [<ffffffffc0753ecc>] ? read_cryptcompress+0x5c/0xa0 [reiser4]
> [ 3125.761738]  [<ffffffffc074e784>] ? reiser4_read_dispatch+0x54/0x130 [reiser4]
> [ 3125.761755]  [<ffffffffa1195d15>] ? vfs_read+0x85/0x150
> [ 3125.761768]  [<ffffffffa1197c2d>] ? SyS_read+0x4d/0xc0
> [ 3125.761782]  [<ffffffffa11a8b76>] ? SyS_ioctl+0x36/0x70
> [ 3125.761795]  [<ffffffffa1519560>] ? entry_SYSCALL_64_fastpath+0x13/0x94
> [ 3125.761810] Code: 76 c0 48 c7 04 24 65 fb 76 c0 bb fb ff ff ff e8 7d 55 9b e0 eb 96 0f 1f 40 00 41 b8 01 00 00 00 31 c9 48 89 f2 e9 b0 e7 fc ff 53 <83> 7f 10 ff 48 89 fb 74 09 48 89 df 5b e9 fd 7d 00 00 e8 d8 7d
> [ 3125.761910] RIP  [<ffffffffc075cf91>] internal_at+0x1/0x30 [reiser4]
> [ 3125.761930]  RSP <ffffaf93c3faf978>
> [ 3125.761939] CR2: 0000000000000010
> [ 3125.774256] ---[ end trace b060c22fa881072e ]---
>
>
> Is this something known to you? I'll try to reproduce, but not yet.
>