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Message-Id: <20110106131258.c4b262bf.akpm@linux-foundation.org> Date: Thu, 6 Jan 2011 13:12:58 -0800 From: Andrew Morton <akpm@...ux-foundation.org> To: StMichalke@....de Cc: bugzilla-daemon@...zilla.kernel.org, Peter Zijlstra <a.p.zijlstra@...llo.nl>, linux-kernel@...r.kernel.org, linux-btrfs@...r.kernel.org Subject: Re: [Bug 26242] New: BUG: unable to handle kernel NULL pointer dereference at (null) (switched to email. Please respond via emailed reply-to-all, not via the bugzilla web interface). On Thu, 6 Jan 2011 20:59:08 GMT bugzilla-daemon@...zilla.kernel.org wrote: > https://bugzilla.kernel.org/show_bug.cgi?id=26242 > > Summary: BUG: unable to handle kernel NULL pointer dereference > at (null) > Product: Memory Management > Version: 2.5 > Kernel Version: 2.6.37 > Platform: All > OS/Version: Linux > Tree: Mainline > Status: NEW > Severity: low > Priority: P1 > Component: Other > AssignedTo: akpm@...ux-foundation.org > ReportedBy: StMichalke@....de > Regression: No > > > My system crashed with the following output: > > ___ > Jan 6 20:06:22 eser kernel: [19365.562621] BUG: unable to handle kernel NULL > pointer dereference at (null) > Jan 6 20:06:22 eser kernel: [19365.562675] IP: [<c022989b>] > kmap_atomic_prot+0x1b/0x100 > Jan 6 20:06:22 eser kernel: [19365.562709] *pde = 00000000 > Jan 6 20:06:22 eser kernel: [19365.562726] Oops: 0000 [#1] PREEMPT SMP > Jan 6 20:06:22 eser kernel: [19365.562752] last sysfs file: > /sys/devices/platform/coretemp.0/temp1_input > Jan 6 20:06:22 eser kernel: [19365.562777] Modules linked in: isofs usblp > usb_storage uas nls_utf8 udf crc_itu_t fuse ipt_MASQUERADE xt_pkttype xt_TCPMSS > xt_tcpudp ipt_LOG xt_limit iptable_nat nf_nat snd_pcm_oss snd_mixer_oss snd_seq > snd_seq_device xt_NOTRACK ipt_REJECT xt_state iptable_raw iptable_filter > nf_conntrack_netbios_ns nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 ip_tables > cpufreq_conservative cpufreq_userspace cpufreq_powersave acpi_cpufreq mperf > speedstep_lib ip6_tables x_tables loop arc4 ecb b43 snd_hda_codec_si3054 > mac80211 snd_hda_codec_realtek snd_hda_intel r8169 snd_hda_codec cfg80211 > sdhci_pci mii snd_hwdep acer_wmi sdhci snd_pcm rfkill iTCO_wdt yenta_socket ssb > tifm_7xx1 iTCO_vendor_support sg sr_mod mmc_core snd_timer pcmcia_core > tifm_core cdrom pcspkr wmi pcmcia_rsrc psmouse snd i2c_i801 shpchp evdev > soundcore battery rng_core ac snd_page_alloc pci_hotplug dm_crypt usbhid hid > nouveau ttm drm_kms_helper drm uhci_hcd rtc_cmos ata_piix i2c_algo_bit i2c_core > rtc_core cfbcopyarea ehci_hcd usb > Jan 6 20:06:22 eser kernel: core video cfbimgblt cfbfillrect rtc_lib output > button nls_base dm_snapshot sha512_generic sha256_generic xts cbc aes_i586 > aes_generic cfq_iosched blk_cgroup btrfs zlib_deflate libcrc32c reiserfs ahci > libahci libata coretemp hwmon fan thermal processor unix [last unloaded: > pktcdvd] > Jan 6 20:06:22 eser kernel: [19365.563014] > Jan 6 20:06:22 eser kernel: [19365.563014] Pid: 15675, comm: gimp-2.6 Not > tainted 2.6.37 #1 Myall2 /Aspire 9410 > Jan 6 20:06:22 eser kernel: [19365.563014] EIP: 0060:[<c022989b>] EFLAGS: > 00010202 CPU: 0 > Jan 6 20:06:22 eser kernel: [19365.563014] EIP is at > kmap_atomic_prot+0x1b/0x100 > Jan 6 20:06:22 eser kernel: [19365.563014] EAX: 00000000 EBX: 00000600 ECX: > f3a82000 EDX: 00000163 > Jan 6 20:06:23 eser kernel: [19365.563014] ESI: f3a83eac EDI: 00000000 EBP: > f3a83db8 ESP: f3a83da8 > Jan 6 20:06:23 eser kernel: [19365.563014] DS: 007b ES: 007b FS: 00d8 GS: > 0033 SS: 0068 > Jan 6 20:06:23 eser kernel: [19365.563014] Process gimp-2.6 (pid: 15675, > ti=f3a82000 task=eaf28000 task.ti=f3a82000) > Jan 6 20:06:23 eser kernel: [19365.563014] Stack: > Jan 6 20:06:23 eser kernel: [19365.563014] f3a83dc0 00000600 f3a83eac > 00000000 f3a83dc0 c022998e f3a83dd8 c0299c0c > Jan 6 20:06:23 eser kernel: [19365.563014] e0359240 00000600 00001000 > 00001000 f3a83dfc f828d6da 00000600 00001008 > Jan 6 20:06:23 eser kernel: [19365.563014] 00000002 00000000 00000002 > 00002000 00001608 f3a83ed0 f828e1ff 00001608 > Jan 6 20:06:23 eser kernel: [19365.563014] Call Trace: > Jan 6 20:06:23 eser kernel: [19365.563014] [<c022998e>] ? > __kmap_atomic+0xe/0x10 > Jan 6 20:06:23 eser kernel: [19365.563014] [<c0299c0c>] ? > iov_iter_copy_from_user_atomic+0x3c/0x90 > Jan 6 20:06:23 eser kernel: [19365.563014] [<f828d6da>] ? > btrfs_copy_from_user+0x5a/0xb0 [btrfs] > Jan 6 20:06:23 eser kernel: [19365.563014] [<f828e1ff>] ? > btrfs_file_aio_write+0x52f/0x9c0 [btrfs] > Jan 6 20:06:23 eser kernel: [19365.563014] [<c02d0810>] ? > __mem_cgroup_commit_charge+0x70/0xe0 > Jan 6 20:06:23 eser kernel: [19365.563014] [<c02d672c>] ? > do_sync_write+0x9c/0xd0 > Jan 6 20:06:23 eser kernel: [19365.563014] [<c02d6b15>] ? > rw_verify_area+0x65/0x100 > Jan 6 20:06:23 eser kernel: [19365.563014] [<c02d6e7a>] ? > vfs_write+0x9a/0x160 > Jan 6 20:06:23 eser kernel: [19365.563014] [<c02d8211>] ? > fget_light+0x91/0xb0 > Jan 6 20:06:23 eser kernel: [19365.563014] [<c02d6690>] ? > do_sync_write+0x0/0xd0 > Jan 6 20:06:23 eser kernel: [19365.563014] [<c02d714d>] ? sys_write+0x3d/0x70 > Jan 6 20:06:23 eser kernel: [19365.563014] [<c0202e18>] ? > sysenter_do_call+0x12/0x28 > Jan 6 20:06:23 eser kernel: [19365.563014] [<c04e0000>] ? > quirk_amd_ide_mode+0x40/0x95 > Jan 6 20:06:23 eser kernel: [19365.563014] Code: 8b 15 4c 6a 6b c0 55 89 e5 e8 > e2 f8 ff ff 5d c3 55 89 e5 83 ec 10 89 e1 81 e1 00 e0 ff ff 89 5d f4 89 75 f8 > 89 7d fc 83 41 14 01 <8b> 08 c1 e9 1e 69 d9 40 03 00 00 8d 8b c0 42 64 c0 2b 8b > cc 45 > Jan 6 20:06:23 eser kernel: [19365.563014] EIP: [<c022989b>] > kmap_atomic_prot+0x1b/0x100 SS:ESP 0068:f3a83da8 > Jan 6 20:06:23 eser kernel: [19365.563014] CR2: 0000000000000000 > Jan 6 20:06:23 eser kernel: [19365.568714] ---[ end trace afc2be06c7d06a71 > ]--- > Jan 6 20:06:23 eser kernel: [19365.568724] note: gimp-2.6[15675] exited with > preempt_count 2 > ___ > > The kernel is an unpatched v2.6.37. I have not seen something like this before. Bugzilla's habit of wordwrapping oops traces is fantastically irritating. Please use attachments to avoid this. Either Peter's new kmap_atomic() stuff blew up or BTRFS is playing around with a NULL page*. I'd wager on the latter. Thanks, I'll ask Rafael and Maciej to track this as a 2.6.36->2.6.37 regression. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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