Hello Sasha, Sergey also reported that and Andrew are handling the problem. https://lkml.org/lkml/2014/3/17/325 Thanks for the report! On Mon, Mar 17, 2014 at 03:56:09PM -0400, Sasha Levin wrote: > 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 > > -- > 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> -- Kind regards, Minchan Kim -- 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>