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
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