On Thu, 9 Jun 2016, M G Berberich wrote: > Hello, > > With 4.7-rc2, after detecting a USB Mass Storage device > > [ 11.589843] usb-storage 4-2:1.0: USB Mass Storage device detected > > a constant flow of kernel-BUGS is reported (several per second). > > [ 11.599215] BUG: using smp_processor_id() in preemptible [00000000] code: > systemd-udevd/389 > [ 11.599218] caller is debug_smp_processor_id+0x17/0x20 > [ 11.599220] CPU: 4 PID: 389 Comm: systemd-udevd Not tainted 4.7.0-rc2 #6 > [ 11.599220] Hardware name: Gigabyte Technology Co., Ltd. H87-HD3/H87-HD3, > BIOS F10 08/18/2015 > [ 11.599223] 0000000000000000 ffff88080466b6c8 ffffffff813fc42d > 0000000000000004 > [ 11.599224] ffffffff81cc1da3 ffff88080466b6f8 ffffffff8141a0f6 > 0000000000000000 > [ 11.599226] ffff880809fe8d98 0000000000000001 00000000000fffff > ffff88080466b708 > [ 11.599226] Call Trace: > [ 11.599229] [<ffffffff813fc42d>] dump_stack+0x4f/0x72 > [ 11.599231] [<ffffffff8141a0f6>] check_preemption_disabled+0xd6/0xe0 > [ 11.599233] [<ffffffff8141a117>] debug_smp_processor_id+0x17/0x20 > [ 11.599235] [<ffffffff814f0336>] alloc_iova_fast+0xb6/0x210 > [ 11.599238] [<ffffffff819ed64f>] ? __wait_on_bit+0x6f/0x90 > [ 11.599240] [<ffffffff814f388d>] intel_alloc_iova+0x9d/0xd0 > [ 11.599241] [<ffffffff814f7c33>] __intel_map_single+0x93/0x190 > [ 11.599242] [<ffffffff814f7d64>] intel_map_page+0x34/0x40 > > Please see https://bugzilla.kernel.org/show_bug.cgi?id=119801 for a > more complete kernel-log This looks like a bug in the memory management subsystem. It should be reported on the linux-mm mailing list (CC'ed). Alan Stern -- 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>