Greetings, 0day kernel testing robot got the below dmesg and the first bad commit is https://github.com/alexshi/linux.git lrunext commit acf49bb9284710c28524098098bda22eb1602275 Author: Alex Shi <alex.shi(a)linux.alibaba.com&gt; AuthorDate: Thu Feb 27 12:24:11 2020 +0800 Commit: Alex Shi <alex.shi(a)linux.alibaba.com&gt; CommitDate: Thu Feb 27 19:45:28 2020 +0800 mm/mlock: split ClearPageLRU from page isolation and remain Mlocked guard This is one of effort to split the PageLRU clear from old page isolation. This patch move the lru_lock after get PageLRU, which takes holding PageLRU as precondition for page isolation, as a preparation for later lru_lock replacment. So we have to unfold __munlock_isolate_lru_page. __split_huge_page_refcount doesn't exist, but we still have to guard PageMlocked in __split_huge_page_tail. that make code ugly and bear few unrelated code in lock. anyway still removed few goto's to dress up current code. Signed-off-by: Alex Shi <alex.shi(a)linux.alibaba.com&gt; Cc: Kirill A. Shutemov <kirill(a)shutemov.name&gt; Cc: Andrew Morton <akpm(a)linux-foundation.org&gt; Cc: Johannes Weiner <hannes(a)cmpxchg.org&gt; Cc: Matthew Wilcox <willy(a)infradead.org&gt; Cc: Hugh Dickins <hughd(a)google.com&gt; Cc: linux-mm(a)kvack.org Cc: linux-kernel(a)vger.kernel.org e46563ef83 mm/lru: add page isolation precondition in __isolate_lru_page acf49bb928 mm/mlock: split ClearPageLRU from page isolation and remain Mlocked guard 4eddfb57a6 mm/memcg: add debug checking in lock_page_memcg +----------------------------------------------------------------+------------+------------+------------+ | | e46563ef83 | acf49bb928 | 4eddfb57a6 | +----------------------------------------------------------------+------------+------------+------------+ | boot_successes | 32 | 1 | 0 | | boot_failures | 3 | 10 | 2 | | WARNING:at_mm/usercopy.c:#usercopy_warn | 1 | | | | RIP:usercopy_warn | 1 | | | | INFO:rcu_sched_self-detected_stall_on_CPU | 1 | | | | RIP:clear_page_erms | 1 | 2 | | | INFO:rcu_sched_detected_stalls_on_CPUs/tasks | 1 | 3 | | | BUG:kernel_hang_in_boot_stage | 1 | 2 | | | BUG:kernel_timeout_in_boot_stage | 0 | 1 | | | BUG:sleeping_function_called_from_invalid_context_at_mm/rmap.c | 0 | 6 | 2 | | BUG:kernel_hang_in_early-boot_stage | 0 | 1 | | | RIP:copy_user_enhanced_fast_string | 0 | 0 | 1 | +----------------------------------------------------------------+------------+------------+------------+ If you fix the issue, kindly add following tag Reported-by: kernel test robot <lkp(a)intel.com&gt; [child5:606] nfsservctl (180) returned ENOSYS, marking as inactive. [child5:606] clock_getres (266:[32BIT]) returned ENOSYS, marking as inactive. [child3:603] mq_getsetattr (245) returned ENOSYS, marking as inactive. [child3:616] mq_timedreceive (243) returned ENOSYS, marking as inactive. [child3:616] kexec_load (246) returned ENOSYS, marking as inactive. [ 36.045721] BUG: sleeping function called from invalid context at mm/rmap.c:1861 [ 36.047309] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 606, name: trinity-c5 [ 36.048622] CPU: 0 PID: 606 Comm: trinity-c5 Not tainted 5.6.0-rc3-00009-gacf49bb928471 #1 [ 36.049991] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 36.051424] Call Trace: [ 36.051773] dump_stack+0x7c/0xa5 [ 36.052198] ___might_sleep+0x161/0x180 [ 36.052682] rmap_walk_anon+0x135/0x320 [ 36.053597] rmap_walk+0x51/0x60 [ 36.053999] try_to_munlock+0x86/0xb0 [ 36.054464] ? page_mkclean+0x140/0x140 [ 36.055335] ? page_remove_rmap+0x4a0/0x4a0 [ 36.055862] ? anon_vma_ctor+0x70/0x70 [ 36.056343] ? page_get_anon_vma+0x180/0x180 [ 36.057299] __munlock_isolated_page+0x46/0xd0 [ 36.057954] munlock_vma_page+0x3be/0x4f0 [ 36.058446] wp_page_copy+0xaba/0xaf0 [ 36.059313] ? follow_pfn+0x160/0x160 [ 36.059780] ? __kasan_check_read+0x11/0x20 [ 36.060294] ? try_to_wake_up+0x183/0xbd0 [ 36.061211] do_wp_page+0x292/0x9b0 [ 36.061643] ? finish_mkwrite_fault+0x210/0x210 [ 36.062199] ? _raw_read_lock_irq+0x40/0x40 [ 36.063149] __handle_mm_fault+0x96a/0x18b0 [ 36.063659] ? apply_to_existing_page_range+0x10/0x10 [ 36.064280] ? _raw_spin_lock+0x75/0xc0 [ 36.065163] ? _raw_read_lock_irq+0x40/0x40 [ 36.065693] ? update_rq_clock+0x126/0x1f0 [ 36.066646] ? __kasan_check_read+0x11/0x20 [ 36.067170] ? __count_memcg_events+0x54/0x120 [ 36.068041] handle_mm_fault+0x1d2/0x2f0 [ 36.068953] __get_user_pages+0x2b8/0xa50 [ 36.069466] ? follow_page_mask+0xa00/0xa00 [ 36.069993] ? down_read+0xeb/0x1c0 [ 36.070873] ? down_read_killable+0x1d0/0x1d0 [ 36.071409] populate_vma_page_range+0x96/0xb0 [ 36.071955] __mm_populate+0x128/0x1f0 [ 36.072850] ? populate_vma_page_range+0xb0/0xb0 [ 36.073424] __x64_sys_mlockall+0x215/0x270 [ 36.073960] do_syscall_64+0xb7/0x390 [ 36.074435] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 36.075056] RIP: 0033:0x457729 [ 36.075445] Code: 00 f3 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 2b 84 00 00 c3 66 2e 0f 1f 84 00 00 00 00 [ 36.077682] RSP: 002b:00007ffedac862c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000097 [ 36.078591] RAX: ffffffffffffffda RBX: 0000000000000097 RCX: 0000000000457729 [ 36.079434] RDX: 000000000000fffd RSI: 000000000d0d0d0d RDI: 0000000000000001 [ 36.080278] RBP: 00007ffedac86370 R08: 0000c8dc6a7819c3 R09: 947ab93afb7ffb80 [ 36.081154] R10: 0000000000000038 R11: 0000000000000246 R12: 0000000000000002 [ 36.082009] R13: 00007f4b65400058 R14: 0000000001057830 R15: 00007f4b65400000 [child3:616] Dumped trace to /boot/trace.txt *** Error in `/bin/trinity': free(): invalid pointer: 0x00000000004b77e0 *** ======= Backtrace: ========= # HH:MM RESULT GOOD BAD GOOD_BUT_DIRTY DIRTY_NOT_BAD git bisect start 0eb7fc20ae4de315c2379e589ce9f184ff635fce f8788d86ab28f61f7b46eb6be375f8a726783636 -- git bisect bad 7a9a8c69941e1374e2686376b8137dd20b28cdc8 # 22:25 B 0 3 19 0 Merge 'linux-review/Gustavo-A-R-Silva/s390-Replace-zero-length-array-with-flexible-array-member/20200223-025126' into devel-hourly-2020022819 git bisect good 6d7ab7e685c4a4f5f3d3199b184f5499f4b02c85 # 23:19 G 11 0 4 4 Merge 'linux-review/Isaac-J-Manjarres/of-of_reserved_mem-Increase-limit-on-number-of-reserved-regions/20200225-033755' into devel-hourly-2020022819 git bisect good 66084a0a5eabcfd704f0bbab048cd9126e7c24ab # 23:53 G 11 0 2 2 Merge 'linux-review/Zhangfei-Gao/MAINTAINERS-add-maintainers-for-uacce/20200226-093543' into devel-hourly-2020022819 git bisect good 2c0ff33777d53be39ccd428650598a52b7080a2d # 01:13 G 11 0 3 3 Merge 'linux-review/Suman-Anna/Drop-PRUSS-and-OMAP4-IPU-DSP-hwmod-data/20200225-072420' into devel-hourly-2020022819 git bisect bad a346803f887ad079c21179d1fd69586cc2f5147c # 01:36 B 0 3 19 0 Merge 'linux-review/Prarit-Bhargava/x86-tsc-Add-kernel-options-to-disable-CPUID-and-MSR-calibrations/20200227-034607' into devel-hourly-2020022819 git bisect bad 360d08b6abbf3adae740222d62ca8032996019e8 # 02:41 B 0 1 17 0 Merge 'linux-review/jack-yu-realtek-com/ASoC-rt1015-modify-some-structure-to-be-static/20200227-101356' into devel-hourly-2020022819 git bisect good 86faac9834b0e94a3901cc1db4272ae41b11a48e # 07:51 G 10 0 5 5 Merge 'linux-review/Anson-Huang/arm64-dts-imx8mn-Adjust-1-2GHz-OPP-voltage-to-OD-mode/20200224-101803' into devel-hourly-2020022819 git bisect bad 1776718bda27b7f353dc434e8384fbd7a9b3980d # 08:48 B 0 2 18 0 Merge 'linux-review/Qian-Cai/tick-sched-fix-data-races-at-tick_do_timer_cpu/20200225-111352' into devel-hourly-2020022819 git bisect bad 0abbb41ee5a632a0cfaa8a0ee59b4e46c9e8544f # 10:00 B 0 2 18 0 Merge 'alexshi/lrunext' into devel-hourly-2020022819 git bisect bad b8e71301886b2ad0b0754fbc6884b6a24ac1931b # 10:52 B 0 1 17 0 mm/lru: take PageLRU first in moving page between lru lists git bisect good 602a257cff49bd0349d0dadc1aa4f0393c77457c # 13:15 G 10 0 2 2 mm/thp: clean up lru_add_page_tail git bisect good 2282ec703a69b8c626c8c36fd6a73f3ac95c4206 # 13:55 G 10 0 5 5 mm/lru: introduce TestClearPageLRU git bisect bad acf49bb9284710c28524098098bda22eb1602275 # 14:37 B 0 1 17 0 mm/mlock: split ClearPageLRU from page isolation and remain Mlocked guard git bisect good e46563ef83b1583c2f2d54e412222cae5b48bc1d # 15:59 G 10 0 2 2 mm/lru: add page isolation precondition in __isolate_lru_page # first bad commit: [acf49bb9284710c28524098098bda22eb1602275] mm/mlock: split ClearPageLRU from page isolation and remain Mlocked guard git bisect good e46563ef83b1583c2f2d54e412222cae5b48bc1d # 16:05 G 30 0 1 3 mm/lru: add page isolation precondition in __isolate_lru_page # extra tests with debug options git bisect good acf49bb9284710c28524098098bda22eb1602275 # 16:50 G 10 0 10 10 mm/mlock: split ClearPageLRU from page isolation and remain Mlocked guard # extra tests on head commit of alexshi/lrunext git bisect bad 4eddfb57a6f7eb0e614389fec3be79bc7b7da65b # 18:32 B 0 1 17 0 mm/memcg: add debug checking in lock_page_memcg # bad: [4eddfb57a6f7eb0e614389fec3be79bc7b7da65b] mm/memcg: add debug checking in lock_page_memcg --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/lkp@lists.01.org