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006d021491bc7-69d6ee129d0mr701634eaf.15.1779349156267; Thu, 21 May 2026 00:39:16 -0700 (PDT) Date: Thu, 21 May 2026 00:39:16 -0700 In-Reply-To: <20260520150018.2491267-1-riel@surriel.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a0eb6a4.170a0220.55718.0291.GAE@google.com> Subject: [syzbot ci] Re: mm: reliable 1GB page allocation From: syzbot ci To: boris@bur.io, clm@meta.com, david@kernel.org, dsterba@suse.com, fvdl@google.com, hannes@cmpxchg.org, hnaz@cmpxchg.org, kernel-team@meta.com, lenb@kernel.org, linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-pm@vger.kernel.org, ljs@kernel.org, pavel@kernel.org, rafael@kernel.org, riel@surriel.com, surenb@google.com, usama.arif@linux.dev, willy@infradead.org, ziy@nvidia.com Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot ci has tested the following series [v1] mm: reliable 1GB page allocation https://lore.kernel.org/all/20260520150018.2491267-1-riel@surriel.com * [RFC PATCH 01/40] mm: page_alloc: replace pageblock_flags bitmap with struct pageblock_data * [RFC PATCH 02/40] mm: page_alloc: per-cpu pageblock buddy allocator * [RFC PATCH 03/40] mm: page_alloc: split-path PCP free with local-trylock + remote-llist * [RFC PATCH 04/40] mm: mm_init: fix zone assignment for pages in unavailable ranges * [RFC PATCH 05/40] mm: page_alloc: remove watermark boost mechanism * [RFC PATCH 06/40] mm: page_alloc: async evacuation of stolen movable pageblocks * [RFC PATCH 07/40] mm: page_alloc: track actual page contents in pageblock flags * [RFC PATCH 08/40] mm: page_alloc: superpageblock metadata for 1GB anti-fragmentation * [RFC PATCH 09/40] mm: page_alloc: support superpageblock resize for memory hotplug * [RFC PATCH 10/40] mm: page_alloc: add superpageblock fullness lists for allocation steering * [RFC PATCH 11/40] mm: page_alloc: steer pageblock stealing to tainted superpageblocks * [RFC PATCH 12/40] mm: page_alloc: steer movable allocations to fullest clean superpageblocks * [RFC PATCH 13/40] mm: page_alloc: extract claim_whole_block from try_to_claim_block * [RFC PATCH 14/40] mm: page_alloc: add per-superpageblock free lists * [RFC PATCH 15/40] mm: page_alloc: add background superpageblock defragmentation worker * [RFC PATCH 16/40] mm: compaction: walk per-superpageblock free lists for migration targets * [RFC PATCH 17/40] mm: page_alloc: superpageblock-aware contiguous and higher order allocation * [RFC PATCH 18/40] mm: page_alloc: prevent atomic allocations from tainting clean SPBs * [RFC PATCH 19/40] mm: page_alloc: aggressively pack non-movable allocs in tainted SPBs on large systems * [RFC PATCH 20/40] mm: page_alloc: prefer reclaim over tainting clean superpageblocks * [RFC PATCH 21/40] mm: page_alloc: adopt partial pageblocks from tainted superpageblocks * [RFC PATCH 22/40] mm: page_alloc: add CONFIG_DEBUG_VM sanity checks for SPB counters * [RFC PATCH 23/40] mm: page_alloc: targeted evacuation and dynamic reserves for tainted SPBs * [RFC PATCH 24/40] mm: page_alloc: prevent UNMOVABLE/RECLAIMABLE mixing in pageblocks * [RFC PATCH 25/40] mm: trigger deferred SPB evac when atomic allocs would taint a clean SPB * [RFC PATCH 26/40] mm: page_alloc: refuse fragmenting fallback for callers with cheap fallback * [RFC PATCH 27/40] mm: page_alloc: cross-migratetype buddy borrow within tainted SPBs * [RFC PATCH 28/40] mm: page_alloc: drive slab shrink from SPB anti-fragmentation pressure * [RFC PATCH 29/40] mm: page_reporting: walk per-superpageblock free lists * [RFC PATCH 30/40] mm: show_mem: collect migratetype letters from per-superpageblock lists * [RFC PATCH 31/40] mm: page_alloc: per-(zone, order, mt) PASS_1 hint cache * [RFC PATCH 32/40] mm: debug: prevent infinite recursion in dump_page() with CMA * [RFC PATCH 33/40] PM: hibernate: walk per-superpageblock free lists in mark_free_pages * [RFC PATCH 34/40] btrfs: allocate eb-attached btree pages as movable * [RFC PATCH 35/40] mm: page_alloc: refuse best-effort high-order allocs servable at lower orders * [RFC PATCH 36/40] mm: page_alloc: set ALLOC_NOFRAGMENT on alloc_frozen_pages_nolock_noprof * [RFC PATCH 37/40] mm: page_alloc: move spb_get_category and spb_tainted_reserve to mmzone.h * [RFC PATCH 38/40] mm: compaction: skip empty tainted superpageblocks as migration source * [RFC PATCH 39/40] mm: compaction: respect tainted SPB reserve in destination selection * [RFC PATCH 40/40] mm: page_alloc: SPB tracepoint instrumentation [DO-NOT-MERGE] and found the following issue: WARNING in preempt_count_sub Full report is available here: https://ci.syzbot.org/series/8eef71e1-708c-40d0-9f9d-3a1bd637fc80 *** WARNING in preempt_count_sub tree: mm-new URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/akpm/mm.git base: 4b83cbc4c15f09b000cc06f033f64b0824b6dc87 arch: amd64 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 config: https://ci.syzbot.org/builds/de024c89-d472-4f06-b5be-4f75f2acd1d9/config ------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(val > preempt_count()) WARNING: kernel/sched/core.c:5883 at preempt_count_sub+0x9e/0x170, CPU#0: kworker/0:0/9 Modules linked in: CPU: 0 UID: 0 PID: 9 Comm: kworker/0:0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Workqueue: events drain_vmap_area_work RIP: 0010:preempt_count_sub+0xa5/0x170 Code: 29 31 90 48 c1 e8 03 0f b6 04 18 84 c0 0f 85 88 00 00 00 83 3d ff 50 9d 0e 00 75 13 48 8d 3d 32 37 a0 0e 48 c7 c6 c0 f8 cb 8b <67> 48 0f b9 3a 90 eb b8 90 e8 ed d6 1d 03 85 c0 74 2f 48 c7 c0 c4 RSP: 0000:ffffc900000e7590 EFLAGS: 00010246 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff8881007d5880 RDX: 0000000000000000 RSI: ffffffff8bcbf8c0 RDI: ffffffff90341000 RBP: ffff888121042dc0 R08: ffffffff903129c3 R09: 1ffffffff2062538 R10: dffffc0000000000 R11: fffffbfff2062539 R12: 0000000000000020 R13: dffffc0000000000 R14: ffff888121042d80 R15: ffff88815fffbae8 FS: 0000000000000000(0000) GS:ffff88818dc7e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff88823ffff000 CR3: 000000000e74a000 CR4: 00000000000006f0 Call Trace: free_frozen_page_commit+0x737/0x1290 __free_frozen_pages+0x873/0x1070 kasan_depopulate_vmalloc_pte+0x6d/0x90 __apply_to_page_range+0xbdc/0x1420 __kasan_release_vmalloc+0xa2/0xd0 purge_vmap_node+0x220/0x960 __purge_vmap_area_lazy+0x779/0xb40 drain_vmap_area_work+0x27/0x40 process_scheduled_works+0xb5d/0x1860 worker_thread+0xa53/0xfc0 kthread+0x388/0x470 ret_from_fork+0x514/0xb70 ret_from_fork_asm+0x1a/0x30 *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com. To test a patch for this bug, please reply with `#syz test` (should be on a separate line). The patch should be attached to the email. Note: arguments like custom git repos and branches are not supported.