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Sat, 17 May 2025 01:21:33 -0700 (PDT) Date: Sat, 17 May 2025 01:21:33 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6828470d.a70a0220.38f255.000c.GAE@google.com> Subject: [syzbot] [mm?] WARNING in folio_large_mapcount From: syzbot To: Liam.Howlett@oracle.com, akpm@linux-foundation.org, baolin.wang@linux.alibaba.com, david@redhat.com, dev.jain@arm.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lorenzo.stoakes@oracle.com, npache@redhat.com, ryan.roberts@arm.com, syzkaller-bugs@googlegroups.com, ziy@nvidia.com Content-Type: text/plain; charset="UTF-8" X-Rspam-User: X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: D50AB1A0005 X-Stat-Signature: uwic8nejaiye3krgxwx5nb69uh5nragp X-HE-Tag: 1747470094-816730 X-HE-Meta: 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 3elOmYxu 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 IeaOtnbe xTnLtAqrv1gxqlssHjFkgyNxVts79KH3XkzZPEdvhfVR1W/zKKjTqJoP4gri7GILaKBbjYYUWnLq5vaYyU4rOkwaqRHZtaqK8mVsSnuzrQYLukxJJUTxkjzIHf5wyMqtpMphotX5YJFkvkmNb8KzFCTBCPu71tfbfAFRLdfkjtCu5uIKUlUucFCsjS328iSS7K+bAGqmX3wopQJ0/+Z69HlACwSvBQd53TIg73Up+cjDtQi5PfYXyoXgjRLalwMvnjUp/r3VMuQdTVnDoksPhhTTZO+ge8QMOCBlSFow8pr1QZXfLmjgwnvdNnyXv883dDbktodCpPgFrYH/oTfvKYUxtyKObn1iqOv9+8oN9KTyITTtYxFlzLLhT1ASe12YLleD0ILfWoOvT46ZhHIJlkfSsDEP4f1T X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hello, syzbot found the following issue on: HEAD commit: 627277ba7c23 Merge tag 'arm64_cbpf_mitigation_2025_05_08' .. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1150f670580000 kernel config: https://syzkaller.appspot.com/x/.config?x=5929ac65be9baf3c dashboard link: https://syzkaller.appspot.com/bug?extid=2b99589e33edbe9475ca compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/0a42ae72fe0e/disk-627277ba.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/0be88297bb66/vmlinux-627277ba.xz kernel image: https://storage.googleapis.com/syzbot-assets/31808a4b1210/bzImage-627277ba.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+2b99589e33edbe9475ca@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: CPU: 1 PID: 38 at ./include/linux/mm.h:1335 folio_large_mapcount+0xd0/0x110 include/linux/mm.h:1335 Modules linked in: CPU: 1 UID: 0 PID: 38 Comm: khugepaged Not tainted 6.15.0-rc6-syzkaller-00025-g627277ba7c23 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:folio_large_mapcount+0xd0/0x110 include/linux/mm.h:1335 Code: 04 38 84 c0 75 29 8b 03 ff c0 5b 41 5e 41 5f e9 96 d2 2b 09 cc e8 d0 cb 99 ff 48 89 df 48 c7 c6 20 de 77 8b e8 a1 dc de ff 90 <0f> 0b 90 eb b6 89 d9 80 e1 07 80 c1 03 38 c1 7c cb 48 89 df e8 87 RSP: 0018:ffffc90000af77e0 EFLAGS: 00010246 RAX: e1fcb38c0ff8ce00 RBX: ffffea00014c8000 RCX: e1fcb38c0ff8ce00 RDX: 0000000000000001 RSI: ffffffff8d9226df RDI: ffff88801e2fbc00 RBP: ffffc90000af7b50 R08: ffff8880b8923e93 R09: 1ffff110171247d2 R10: dffffc0000000000 R11: ffffed10171247d3 R12: 1ffffd4000299000 R13: dffffc0000000000 R14: 0000000000000000 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8881261fb000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe58f12dc0 CR3: 0000000030e04000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: folio_mapcount include/linux/mm.h:1369 [inline] is_refcount_suitable+0x350/0x430 mm/khugepaged.c:553 hpage_collapse_scan_file+0x6d4/0x4200 mm/khugepaged.c:2323 khugepaged_scan_mm_slot mm/khugepaged.c:2447 [inline] khugepaged_do_scan mm/khugepaged.c:2548 [inline] khugepaged+0xa2a/0x1690 mm/khugepaged.c:2604 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup