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Subjectmm: kernel BUG at mm/huge_memory.c:1829!
Hi all,

While fuzzing with trinity inside a KVM tools guest running the latest -next
kernel, I've stumbled on the following:

[ 1275.253114] kernel BUG at mm/huge_memory.c:1829!
[ 1275.253642] invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
[ 1275.254775] Dumping ftrace buffer:
[ 1275.255631] (ftrace buffer empty)
[ 1275.256440] Modules linked in:
[ 1275.257347] CPU: 20 PID: 22807 Comm: trinity-c299 Not tainted 3.14.0-next-20140407-sasha-00023-gd35b0d6 #382
[ 1275.258686] task: ffff8803e7873000 ti: ffff8803e7896000 task.ti: ffff8803e7896000
[ 1275.259416] RIP: __split_huge_page (mm/huge_memory.c:1829 (discriminator 1))
[ 1275.260527] RSP: 0018:ffff8803e7897bb8 EFLAGS: 00010297
[ 1275.261323] RAX: 000000000000012c RBX: ffff8803e789d600 RCX: 0000000000000006
[ 1275.261323] RDX: 0000000000005b80 RSI: ffff8803e7873d00 RDI: 0000000000000282
[ 1275.261323] RBP: ffff8803e7897c68 R08: 0000000000000000 R09: 0000000000000000
[ 1275.261323] R10: 0000000000000001 R11: 30303320746e756f R12: 0000000000000000
[ 1275.261323] R13: 0000000000a00000 R14: ffff8803ede73000 R15: ffffea0010030000
[ 1275.261323] FS: 00007f899d23f700(0000) GS:ffff880437000000(0000) knlGS:0000000000000000
[ 1275.261323] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 1275.261323] CR2: 00000000024cf048 CR3: 00000003e787f000 CR4: 00000000000006a0
[ 1275.261323] DR0: 0000000000696000 DR1: 0000000000696000 DR2: 0000000000000000
[ 1275.261323] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
[ 1275.261323] Stack:
[ 1275.261323] ffff8803e7897bd8 ffff880024dab898 ffff8803e7897bd8 ffffffffac1bea0e
[ 1275.261323] ffff8803e7897c28 0000000000000282 00000014b06cc072 0000000000000000
[ 1275.261323] 0000012be7897c28 0000000000000a00 ffff880024dab8d0 ffff880024dab898
[ 1275.261323] Call Trace:
[ 1275.261323] ? put_lock_stats.isra.12 (arch/x86/include/asm/preempt.h:98 kernel/locking/lockdep.c:254)
[ 1275.261323] ? down_write (kernel/locking/rwsem.c:51 (discriminator 2))
[ 1275.261323] ? split_huge_page_to_list (mm/huge_memory.c:1874)
[ 1275.261323] split_huge_page_to_list (include/linux/vmstat.h:37 mm/huge_memory.c:1879)
[ 1275.261323] __split_huge_page_pmd (mm/huge_memory.c:2811)
[ 1275.261323] ? mutex_unlock (kernel/locking/mutex.c:220)
[ 1275.261323] ? __mutex_unlock_slowpath (arch/x86/include/asm/paravirt.h:809 kernel/locking/mutex.c:713 kernel/locking/mutex.c:722)
[ 1275.261323] ? get_parent_ip (kernel/sched/core.c:2471)
[ 1275.261323] ? preempt_count_sub (kernel/sched/core.c:2526)
[ 1275.261323] follow_page_mask (mm/memory.c:1518 (discriminator 1))
[ 1275.261323] SYSC_move_pages (mm/migrate.c:1227 mm/migrate.c:1353 mm/migrate.c:1508)
[ 1275.261323] ? SYSC_move_pages (include/linux/rcupdate.h:800 mm/migrate.c:1472)
[ 1275.261323] ? sched_clock_local (kernel/sched/clock.c:213)
[ 1275.261323] SyS_move_pages (mm/migrate.c:1456)
[ 1275.261323] tracesys (arch/x86/kernel/entry_64.S:749)
[ 1275.261323] Code: c0 01 39 45 94 74 18 41 8b 57 18 48 c7 c7 90 5e 6d b0 31 c0 8b 75 94 83 c2 01 e8 3d 6a 23 03 41 8b 47 18 83 c0 01 39 45 94 74 02 <0f> 0b 49 8b 07 48 89 c2 48 c1 e8 34 83 e0 03 48 c1 ea 36 4c 8d
[ 1275.261323] RIP __split_huge_page (mm/huge_memory.c:1829 (discriminator 1))
[ 1275.261323] RSP <ffff8803e7897bb8>

Looking at the code, there was supposed to be a printk printing both
mapcounts if they're different. However, there was no matching entry
in the log for that.


Thanks,
Sasha


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