Messages in this thread | | | Date | Wed, 1 Oct 2014 12:30:15 -0700 | Subject | 3.17.0-rc7 kernel NULL pointer dereference | From | Kui Zhang <> |
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Hello,
We have been getting NULL pointer dereference error, with 3.17.0-rc7, built from commit aad7fb916a10f1065ad23de0c80a4a04bcba8437
I don't know how to reproduce this. It seem to happen during high io load (sometimes). I got follow via usb a serial console, not sure if trace is complete.
[12660.20467[12660.205958] kworker/u8:5 D ffff8803b3123020 0 23992 2 0x00000000 [12660.206000] Workqueue: btrfs-endio-write btrfs_endio_write_helper [12660.206035] ffff8803ad30fb18 0000000000000002 ffff8803ad30fa78 ffff8803b3123020 [12660.206117] ffff8803ad30ffd8 0000000000004000 ffff8800b1a00000 ffff8803b3123020 [12660.206183] ffff88035d346000 0000000000000000 ffff8803ad30fa78 ffff8800927a6940 [12660.206244] Call Trace: [12660.206277] [<ffffffff8137c1aa>] ? btrfs_leaf_free_space+0x5a/0xc0 [12660[12772.061906] BTRFS info (device sda2): The free space cache file (914857394176) is invalid. skip it [12772.061906] [12772.113733] BTRFS info (device sda2): The free space cache file (1032968994816) is invalid. skip it [12772.113733] [17981.856115] perf interrupt took too long (4994 > 4960), lowering kernel.perf_event_max_sample_rate to 25200 [27826.446614] EXT4-fs (md0): mounting ext3 file system using the ext4 subsystem [27826.580071] EXT4-fs (md0): mounted filesystem with ordered data mode. Opts: (null) [50418.016235] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018 [50418.016321] IP: [<ffffffff8149e080>] swiotlb_unmap_sg_attrs+0x30/0x70 [50418.016368] PGD 1f5dd4067 PUD 346dd3067 PMD 0 [50418.016403] Oops: 0000 [#1] SMP [50418.016435] Modules linked in: cpuid nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack serio_raw microcode [50418.016512] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G I 3.17.0-rc7-backup5001 #11 [50418.016567] Hardware name: empty empty/S5393, BIOS V1.05 04/24/2009 [50418.016601] task: ffff880429568000 t[ 0.000000] Initializing cgroup subsys cpuset [ 0.000000] Initializing cgroup subsys cpu [ 0.000000] Initializing cgroup subsys cpuacct
Anything I can due to narrow down the problem ?
Thanks Kui.Z
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