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Tue, 27 Oct 2026 16:10:22 -0700 (PDT) Date: Tue, 27 Oct 2026 16:10:22 -0700 In-Reply-To: <20261027113813.1332096-1-trintaeoitogc@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ae12f5e.985912ea.1e5798.00c8.GAE@google.com> Subject: [syzbot ci] Re: mm: clear pmd in pmdp_invalidate() From: syzbot ci To: akpm@linux-foundation.org, david@kernel.org, liam@infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, ljs@kernel.org, mhocko@suse.com, rppt@kernel.org, surenb@google.com, trintaeoitogc@gmail.com, vbabka@kernel.org 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: clear pmd in pmdp_invalidate() https://lore.kernel.org/all/20261027113813.1332096-1-trintaeoitogc@gmail.com * [PATCH] mm: clear pmd in pmdp_invalidate() and found the following issue: kernel BUG in page_table_check_clear Full report is available here: https://ci.syzbot.org/series/ea6c690b-0dbf-4e3e-8367-2b5092d2878d *** kernel BUG in page_table_check_clear tree: mm-new URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/akpm/mm.git base: 01146870c415f6ff70a469fb7ceb962a3f2c8c52 arch: amd64 compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 config: https://ci.syzbot.org/builds/b4be77d2-e026-48a2-b906-ba8967ba2d37/config syz repro: https://ci.syzbot.org/findings/8fa94c36-acda-4fe5-a760-1dea60977f77/syz_repro ------------[ cut here ]------------ kernel BUG at mm/page_table_check.c:83! Oops: invalid opcode: 0000 [#1] SMP KASAN PTI CPU: 0 UID: 0 PID: 5817 Comm: syz.0.17 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 RIP: 0010:page_table_check_clear+0x4ec/0x500 mm/page_table_check.c:83 Code: 89 e7 e8 f7 1a f4 ff e9 bd fb ff ff e8 4d 37 83 ff 90 0f 0b e8 45 37 83 ff 90 0f 0b e8 3d 37 83 ff 90 0f 0b e8 35 37 83 ff 90 <0f> 0b e8 2d 37 83 ff 90 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 90 90 RSP: 0018:ffffc900035eed50 EFLAGS: 00010293 RAX: ffffffff8244dd9b RBX: 0000000000000200 RCX: ffff88810d88bc00 RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000 RBP: ffff888104dea000 R08: ffff888104dea04b R09: 1ffff110209bd409 R10: dffffc0000000000 R11: ffffed10209bd40a R12: 00000000ffffffff R13: 0000000000000001 R14: ffff888104dea048 R15: 0000000000116200 FS: 00007f8b11ee36c0(0000) GS:ffff88818c4c0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000140 CR3: 0000000112c36000 CR4: 00000000000006f0 Call Trace: page_table_check_pmd_clear include/linux/page_table_check.h:64 [inline] pmdp_invalidate+0x2fc/0x310 mm/pgtable-generic.c:206 __split_huge_pmd_locked mm/huge_memory.c:3323 [inline] split_huge_pmd_locked+0x100a/0x2e50 mm/huge_memory.c:3476 __split_huge_pmd+0x202/0x2e0 mm/huge_memory.c:3490 zap_pmd_range mm/memory.c:2136 [inline] zap_pud_range mm/memory.c:2179 [inline] zap_p4d_range mm/memory.c:2200 [inline] __zap_vma_range+0xb85/0x4f80 mm/memory.c:2240 zap_vma_range_batched+0x3e0/0x5b0 mm/memory.c:2351 madvise_dontneed_single_vma mm/madvise.c:868 [inline] madvise_dontneed_free mm/madvise.c:959 [inline] madvise_vma_behavior+0x252b/0x41d0 mm/madvise.c:1370 madvise_walk_vmas+0x924/0xb00 mm/madvise.c:1687 madvise_do_behavior+0x385/0x540 mm/madvise.c:1916 do_madvise+0x327/0x3a0 mm/madvise.c:2014 __do_sys_madvise mm/madvise.c:2023 [inline] __se_sys_madvise mm/madvise.c:2021 [inline] __x64_sys_madvise+0xa6/0xc0 mm/madvise.c:2021 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8b10f9f559 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f8b11ee3028 EFLAGS: 00000246 ORIG_RAX: 000000000000001c RAX: ffffffffffffffda RBX: 00007f8b11225fa0 RCX: 00007f8b10f9f559 RDX: 0000000000000004 RSI: 0000000000003000 RDI: 000020000015e000 RBP: 00007f8b11036b20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8b11226038 R14: 00007f8b11225fa0 R15: 00007fff02a6aba8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:page_table_check_clear+0x4ec/0x500 mm/page_table_check.c:83 Code: 89 e7 e8 f7 1a f4 ff e9 bd fb ff ff e8 4d 37 83 ff 90 0f 0b e8 45 37 83 ff 90 0f 0b e8 3d 37 83 ff 90 0f 0b e8 35 37 83 ff 90 <0f> 0b e8 2d 37 83 ff 90 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 90 90 RSP: 0018:ffffc900035eed50 EFLAGS: 00010293 RAX: ffffffff8244dd9b RBX: 0000000000000200 RCX: ffff88810d88bc00 RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000 RBP: ffff888104dea000 R08: ffff888104dea04b R09: 1ffff110209bd409 R10: dffffc0000000000 R11: ffffed10209bd40a R12: 00000000ffffffff R13: 0000000000000001 R14: ffff888104dea048 R15: 0000000000116200 FS: 00007f8b11ee36c0(0000) GS:ffff88818c4c0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000140 CR3: 0000000112c36000 CR4: 00000000000006f0 *** 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 fix for this bug, please reply with `#syz test` (on a separate line) and attach the patch to the email. Notes: - The patch will be applied on top of the tested series (as an incremental fix). - To test a new version of the whole series, please send it directly to syzbot@lists.linux.dev. - Arguments like custom git repos and branches are not supported.