From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751797AbaCQT4X (ORCPT ); Mon, 17 Mar 2014 15:56:23 -0400 Received: from userp1040.oracle.com ([156.151.31.81]:19883 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751491AbaCQT4R (ORCPT ); Mon, 17 Mar 2014 15:56:17 -0400 Message-ID: <53275359.7000802@oracle.com> Date: Mon, 17 Mar 2014 15:56:09 -0400 From: Sasha Levin User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 MIME-Version: 1.0 To: Minchan Kim , ngupta@vflare.org CC: "linux-mm@kvack.org" , LKML Subject: zram: sleeping vunmap_pmd_range called from atomic zram_make_request Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Source-IP: ucsinet22.oracle.com [156.151.31.94] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi all, While fuzzing with trinity inside a KVM tools guest running the latest -next kernel I've stumbled on the following spew: [ 827.272181] BUG: sleeping function called from invalid context at mm/vmalloc.c:74 [ 827.273204] in_atomic(): 1, irqs_disabled(): 0, pid: 4213, name: kswapd14 [ 827.274080] 1 lock held by kswapd14/4213: [ 827.274587] #0: (&zram->init_lock){++++.-}, at: zram_make_request (drivers/block/zram/zram_drv.c:765) [ 827.275923] Preemption disabled zram_bvec_write (drivers/block/zram/zram_drv.c:500) [ 827.276910] [ 827.277104] CPU: 30 PID: 4213 Comm: kswapd14 Tainted: G W 3.14.0-rc6-next-20140317-sasha-00012-ge933921-dirty #226 [ 827.278467] ffff880229700000 ffff8802296fd388 ffffffff8449ebb3 0000000000000001 [ 827.279610] 0000000000000000 ffff8802296fd3b8 ffffffff81176cec ffff8802296fd3c8 [ 827.281258] [ 827.281549] ffff88032b40a000 ffffc900077fa000 ffffc900077f8000 ffff8802296fd428 [ 827.282911] Call Trace: [ 827.283318] dump_stack (lib/dump_stack.c:52) [ 827.284013] __might_sleep (kernel/sched/core.c:7016) [ 827.284797] vunmap_pmd_range (mm/vmalloc.c:74) [ 827.285486] ? sched_clock_cpu (kernel/sched/clock.c:311) [ 827.286313] vunmap_page_range (mm/vmalloc.c:97 mm/vmalloc.c:112) [ 827.287177] unmap_kernel_range (mm/vmalloc.c:1273) [ 827.288055] zs_unmap_object (mm/zsmalloc.c:1086) [ 827.288863] zram_bvec_write (drivers/block/zram/zram_drv.c:516) [ 827.289628] zram_bvec_rw (drivers/block/zram/zram_drv.c:551) [ 827.290844] __zram_make_request (drivers/block/zram/zram_drv.c:743) [ 827.291629] zram_make_request (drivers/block/zram/zram_drv.c:774) [ 827.292414] generic_make_request (block/blk-core.c:1862) [ 827.293283] submit_bio (block/blk-core.c:1913) [ 827.294134] ? test_set_page_writeback (include/linux/rcupdate.h:800 include/linux/memcontrol.h:180 mm/page-writeback.c:2408) [ 827.295287] __swap_writepage (mm/page_io.c:315) [ 827.296287] ? preempt_count_sub (kernel/sched/core.c:2530) [ 827.297199] ? _raw_spin_unlock (arch/x86/include/asm/preempt.h:98 include/linux/spinlock_api_smp.h:152 kernel/locking/spinlock.c:183) [ 827.298019] ? page_swapcount (mm/swapfile.c:898) [ 827.298802] swap_writepage (mm/page_io.c:249) [ 827.299534] pageout (mm/vmscan.c:502) [ 827.300721] shrink_page_list (mm/vmscan.c:1015) [ 827.301475] shrink_inactive_list (include/linux/spinlock.h:328 mm/vmscan.c:1503) [ 827.302320] ? shrink_active_list (mm/vmscan.c:1744) [ 827.303170] shrink_lruvec (mm/vmscan.c:1830 mm/vmscan.c:2054) [ 827.303881] ? sched_clock (arch/x86/include/asm/paravirt.h:192 arch/x86/kernel/tsc.c:305) [ 827.304518] shrink_zone (mm/vmscan.c:2235) [ 827.305327] kswapd_shrink_zone (include/linux/bitmap.h:165 include/linux/nodemask.h:131 mm/vmscan.c:2904) [ 827.306117] balance_pgdat (mm/vmscan.c:3088) [ 827.306808] ? finish_wait (kernel/sched/wait.c:254) [ 827.307479] kswapd (mm/vmscan.c:3296) [ 827.308127] ? perf_trace_mm_vmscan_wakeup_kswapd (mm/vmscan.c:3213) [ 827.309164] ? perf_trace_mm_vmscan_wakeup_kswapd (mm/vmscan.c:3213) [ 827.310391] kthread (kernel/kthread.c:216) [ 827.311092] ? __tick_nohz_task_switch (arch/x86/include/asm/paravirt.h:809 kernel/time/tick-sched.c:272) [ 827.312070] ? set_kthreadd_affinity (kernel/kthread.c:185) [ 827.312903] ret_from_fork (arch/x86/kernel/entry_64.S:555) [ 827.313627] ? set_kthreadd_affinity (kernel/kthread.c:185) Thanks, Sasha