On Tue, Jan 20, 2015 at 10:38:32AM +0100, Krzysztof Kozlowski wrote: > Hi, > > > Since next-20150119 booting of Exynos4 based boards is nearly impossible > because of continuous BUG on messages. The system finally boots... but > console log is polluted with: > > [ 9.700828] BUG: using smp_processor_id() in preemptible [00000000] code: udevd/1656 > [ 9.708525] caller is kfree+0x8c/0x198 > [ 9.712229] CPU: 2 PID: 1656 Comm: udevd Tainted: G W 3.19.0-rc4-00279-gd2dc80750ee0 #1630 > [ 9.721501] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree) > [ 9.727602] [<c0014980>] (unwind_backtrace) from [<c0011904>] (show_stack+0x10/0x14) > [ 9.735324] [<c0011904>] (show_stack) from [<c0585bbc>] (dump_stack+0x70/0xbc) > [ 9.742525] [<c0585bbc>] (dump_stack) from [<c01e79e0>] (check_preemption_disabled+0xf8/0x128) > [ 9.751114] [<c01e79e0>] (check_preemption_disabled) from [<c00c501c>] (kfree+0x8c/0x198) > [ 9.759265] [<c00c501c>] (kfree) from [<c0299b7c>] (uevent_show+0x38/0x104) > [ 9.766210] [<c0299b7c>] (uevent_show) from [<c0299fb8>] (dev_attr_show+0x1c/0x48) > [ 9.773763] [<c0299fb8>] (dev_attr_show) from [<c0122424>] (sysfs_kf_seq_show+0x8c/0x10c) > [ 9.781920] [<c0122424>] (sysfs_kf_seq_show) from [<c0120f90>] (kernfs_seq_show+0x24/0x28) > [ 9.790172] [<c0120f90>] (kernfs_seq_show) from [<c00e93b0>] (seq_read+0x1ac/0x480) > [ 9.797806] [<c00e93b0>] (seq_read) from [<c00cacf4>] (__vfs_read+0x18/0x4c) > [ 9.804833] [<c00cacf4>] (__vfs_read) from [<c00cada4>] (vfs_read+0x7c/0x100) > [ 9.811950] [<c00cada4>] (vfs_read) from [<c00cae68>] (SyS_read+0x40/0x8c) > [ 9.818810] [<c00cae68>] (SyS_read) from [<c000f160>] (ret_fast_syscall+0x0/0x30) > > I bisected this to: > > d2dc80750ee05ceb03c9b13b0531a782116d1ade > Author: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> > Date: Sat Jan 17 11:23:23 2015 +1100 > mm/slub: optimize alloc/free fastpath by removing preemption on/off > > Full dmesg and config attached. > > Any ideas? Hello, This issue will be fixed in next mmotm release. Following patch is next version of commit d2dc80750ee05ceb03c9b13b0531a782116d1ade. https://lkml.org/lkml/2015/1/19/17 Thanks. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>