Hi Pavel,

FYI here is 0day's bisect result. The attached dmesg has reproduce
script at the bottom.

[27e2ce5dba4c30db031744c8140675d03d2ae7aa] mm: access to uninitialized struct page
git://git.cmpxchg.org/linux-mmotm.git devel-catchup-201805041701

git bisect start 53eff77ad4b0adaf1ca6e1ecc6acf3804c344531 6da6c0db5316275015e8cc2959f12a17584aeb64 --
git bisect  bad 3fc24705ffb48c18b23ce2c229f5018d39b18ab0  # 20:22  B      2Merge 'djwong-xfs/djwong-devel' into devel-catchup-201805041701
git bisect  bad 78bd9ee71ffbbe5ab169cbe469503af2dfb913f9  # 20:35  B      2Merge 'linux-review/Geert-Uytterhoeven/dt-bindings-can-rcar_can-Fix-R8A7796-SoC-name/20180504-154952' into devel-catchup-201805041701
git bisect  bad 1deba87932c5d0adcffe63d8ce4847f39e864775  # 20:56  B      2Merge 'yhuang/fix_thp_swap' into devel-catchup-201805041701
git bisect good e0997365e1e89e8bc9f5ed4a58a6cd2500b58668  # 21:09  G      20day base guard for 'devel-catchup-201805041701'
git bisect  bad 98815bfa9156a8d1da1f1ca5f3748e250fa19a88  # 21:22  B      2Merge 'yhuang/thp_delay_split3_r1a' into devel-catchup-201805041701
git bisect good 6da6c0db5316275015e8cc2959f12a17584aeb64  # 21:22  G      3Linux v4.17-rc3
git bisect  bad 97c561bb48a33e135a90573c596bc755ed4eab32  # 21:36  B      2mm, pagemap: Hide swap entry for unprivileged users
git bisect  bad 466b08a3a87e8e43af677375a4cf8eb105f50007  # 21:47  B      2mm, swap: fix race between swapoff and some swap operations
git bisect  bad 44ea77b7788384a7c27a960ec5752de08e47882a  # 21:58  B      2zram-introduce-zram-memory-tracking-fix
git bisect  bad 7a53abd52e920e8a2c16ea2cb81439e6e87a7ea4  # 22:06  B      2prctl: add PR_[GS]ET_PDEATHSIG_PROC
git bisect good 1fda92fccc022924575edb98191f1ad2c0477c31  # 22:15  G      2z3fold-fix-reclaim-lock-ups-checkpatch-fixes
git bisect  bad 685cc80b632235416b72869247df7d6ae2816d61  # 22:30  B      2mm: migrate: fix double call of radix_tree_replace_slot()
git bisect  bad 27e2ce5dba4c30db031744c8140675d03d2ae7aa  # 22:55  B      2mm: access to uninitialized struct page
git bisect good 7a0e68e17b8aa41aa33e8c80015e36d47dde390a  # 23:11  G      2mm: sections are not offlined during memory hotremove
# extra tests on first bad commit
# bad: [27e2ce5dba4c30db031744c8140675d03d2ae7aa] mm: access to uninitialized struct page
# extra tests on parent commit
# good: [7a0e68e17b8aa41aa33e8c80015e36d47dde390a] mm: sections are not offlined during memory hotremove

tests: 2
testcase/path_params/tbox_group/run: boot/1/vm-vp-quantal-x86_64

7a0e68e17b8aa41a  27e2ce5dba4c30db031744c814  
----------------  --------------------------  
        fail:runs  %reproduction    fail:runs
            |             |             |    
            :2          100%           2:2     dmesg.BUG:kernel_reboot-without-warning_in_boot_stage

testcase/path_params/tbox_group/run: boot/1/vm-lkp-nex04-yocto-x86_64

7a0e68e17b8aa41a  27e2ce5dba4c30db031744c814  
----------------  --------------------------  
            :4          100%           4:4     dmesg.BUG:kernel_reboot-without-warning_in_boot_stage

Thanks,
Fengguang