linux-kernel - BUG: update-grub, unable to handle kernel NULL pointer dereference

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Date:	Sat, 30 May 2015 01:03:24 -0700
From:	Jeremiah Mahler <jmmahler@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: BUG: update-grub, unable to handle kernel NULL pointer dereference

all,

When running update-grub on a system with a Windows partition the kernel
will oops with a "BUG: unable to handle kernel NULL pointer dereference"
message.  It does this during the call to os-prober.  After the oops
the system locks and requires a hard reset to get it running again.

This bug is present in the current linux-next (20150529) and as far
back as 20150522 and possibly earlier.  That last working kernel I
have is tagged 4.1.0-rc1+.

Below is a snippet from the back trace.  The full log is attached.

  ...
  May 29 10:57:03 hudson 50mounted-tests[3413]: debug: running subtest /usr/lib/os-probes/mounted/20microsoft
  May 29 10:57:03 hudson 20microsoft[3416]: debug: /dev/sda1 is a NTFS partition
  May 29 10:57:03 hudson 20microsoft[3431]: result: /dev/sda1:Windows 7 (loader):Windows:chain
  May 29 10:57:03 hudson 50mounted-tests[3432]: debug: os found by subtest /usr/lib/os-probes/mounted/20microsoft
  May 29 10:57:03 hudson kernel: BUG: unable to handle kernel NULL pointer dereference at           (null)
  May 29 10:57:03 hudson kernel: IP: [<          (null)>]           (null)
  May 29 10:57:03 hudson kernel: PGD c9e43067 PUD c7b4a067 PMD 0 
  May 29 10:57:03 hudson kernel: Oops: 0010 [#1] SMP 
  May 29 10:57:03 hudson kernel: Modules linked in: vfat msdos fat dm_mod cpufreq_conservative cpufreq_stats cpufreq_userspace cpufreq_powersave binfmt_misc nfsd auth_rpcgss oid_registry nfs_acl nfs lockd grace fscache sunrpc joydev arc4 iwldvm mac80211 x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm i915 iTCO_wdt crct10dif_pclmul iTCO_vendor_support iwlwifi snd_hda_codec_hdmi crc32_pclmul snd_hda_codec_realtek crc32c_intel snd_hda_codec_generic cfg80211 snd_hda_intel snd_hda_codec ghash_clmulni_intel i2c_algo_bit aesni_intel drm_kms_helper aes_x86_64 snd_hwdep glue_helper lrw psmouse snd_hda_core gf128mul ablk_helper cryptd evdev mei_me tpm_tis drm snd_pcm serio_raw mei pcspkr tpm thinkpad_acpi wmi i2c_i801 shpchp snd_timer nvram snd battery rfkill lpc_ich ac video intel_smartconnect i2c_core soundcore
  May 29 10:57:03 hudson kernel:  button mfd_core processor loop fuse autofs4 ext4 crc16 mbcache jbd2 sg sd_mod ahci libahci libata sdhci_pci scsi_mod xhci_pci ehci_pci sdhci ehci_hcd xhci_hcd mmc_core usbcore thermal usb_common thermal_sys
  May 29 10:57:03 hudson kernel: CPU: 3 PID: 3433 Comm: umount Not tainted 4.1.0-rc4-next-20150522 #404
  May 29 10:57:03 hudson kernel: Hardware name: LENOVO 3443CTO/3443CTO, BIOS G6ET59WW (2.03 ) 09/11/2012
  May 29 10:57:03 hudson kernel: task: ffff880036bbd4d0 ti: ffff880118fd4000 task.ti: ffff880118fd4000
  May 29 10:57:03 hudson kernel: RIP: 0010:[<0000000000000000>]  [<          (null)>]           (null)
  May 29 10:57:03 hudson kernel: RSP: 0018:ffff880118fd7ea0  EFLAGS: 00010246
  May 29 10:57:03 hudson kernel: RAX: 0000000000000000 RBX: ffff8800c95b6000 RCX: ffff8800355c9000
  May 29 10:57:03 hudson kernel: RDX: 0000000000000001 RSI: 0000000000000286 RDI: ffff88003652c800
  May 29 10:57:03 hudson kernel: RBP: ffff8800c95b60c0 R08: 000800010000feb4 R09: 0000fead0000fea5
  May 29 10:57:03 hudson kernel: R10: 0000fead0000fea5 R11: 0000fe9d0000fe95 R12: ffffffffa0241b40
  May 29 10:57:03 hudson kernel: R13: ffff880036bbd4d0 R14: 0000000000000000 R15: 0000000000000000
  May 29 10:57:03 hudson kernel: FS:  00007f8d586b8840(0000) GS:ffff88011e380000(0000) knlGS:0000000000000000
  May 29 10:57:03 hudson kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  May 29 10:57:03 hudson kernel: CR2: 0000000000000000 CR3: 0000000036b7e000 CR4: 00000000001407e0
  May 29 10:57:03 hudson kernel: Stack:
  May 29 10:57:03 hudson kernel:  ffffffff811ae1fe 0000000000000028 ffffffffa02430c0 ffff880036bbdb28
  May 29 10:57:03 hudson kernel:  ffffffff811ae4de ffff8800c95b6000 ffffffff811ae86c ffff8800c95b6000
  May 29 10:57:03 hudson kernel:  ffff8801182fd200 ffffffff81a81400 ffffffff811ca15b 0000000000000000
  May 29 10:57:03 hudson kernel: Call Trace:
  May 29 10:57:03 hudson kernel:  [<ffffffff811ae1fe>] ? generic_shutdown_super+0x6e/0xf0
  May 29 10:57:03 hudson kernel:  [<ffffffff811ae4de>] ? kill_anon_super+0xe/0x20
  May 29 10:57:03 hudson kernel:  [<ffffffff811ae86c>] ? deactivate_locked_super+0x3c/0x70
  May 29 10:57:03 hudson kernel:  [<ffffffff811ca15b>] ? cleanup_mnt+0x3b/0x80
  May 29 10:57:03 hudson kernel:  [<ffffffff81080d3a>] ? task_work_run+0x9a/0xc0
  May 29 10:57:03 hudson kernel:  [<ffffffff81012d5f>] ? do_notify_resume+0x5f/0x80
  May 29 10:57:03 hudson kernel:  [<ffffffff81519e84>] ? int_signal+0x12/0x17
  May 29 10:57:03 hudson kernel: Code:  Bad RIP value.
  May 29 10:57:03 hudson kernel: RIP  [<          (null)>]           (null)
  May 29 10:57:03 hudson kernel:  RSP <ffff880118fd7ea0>
  May 29 10:57:03 hudson kernel: CR2: 0000000000000000
  May 29 10:57:03 hudson kernel: ---[ end trace f8d3aacb091ee378 ]---
  May 29 10:57:03 hudson 50mounted-tests[3434]: warning: failed to umount /var/lib/os-prober/mount
  May 29 10:57:03 hudson os-prober[3436]: debug: os detected by /usr/lib/os-probes/50mounted-tests
  May 29 10:57:03 hudson os-prober[3442]: debug: running /usr/lib/os-probes/50mounted-tests on /dev/sda2
  ...

Any help diagnosing this bug would be appreciated.

-- 
- Jeremiah Mahler

View attachment "failure.log" of type "text/plain" (120682 bytes)