From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f207.google.com (mail-il1-f207.google.com [209.85.166.207]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1C4DCBE65 for ; Tue, 17 Jun 2025 08:11:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.207 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750147893; cv=none; b=RUZKxEmoMc1P8Mx9E62zHW9v6oYFFB9qoFEr+hnmaFqAJzTzsrl8a6ZGM9PHSb/cufMVjRXCs0Y8juXFUEkCHP9vJMwNxIYp5nGRI/iyYrdTFGFxAfp2D+2t3RTNdV6/aRs5yIimmpSQFPXrc5znbUeM5OCFUHvM+wv3xlETxyU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750147893; c=relaxed/simple; bh=BI7RwyuzscKlUbx6sWqCbc8t0miAH0Q20fqfT0TGP5I=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; 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List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:260e:b0:3dd:d18a:2d71 with SMTP id e9e14a558f8ab-3de07c4c33cmr154018645ab.2.1750147891201; Tue, 17 Jun 2025 01:11:31 -0700 (PDT) Date: Tue, 17 Jun 2025 01:11:31 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68512333.a70a0220.395abc.0205.GAE@google.com> Subject: [syzbot] [mm?] WARNING: bad unlock balance in move_pgt_entry From: syzbot To: Liam.Howlett@oracle.com, akpm@linux-foundation.org, jannh@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lorenzo.stoakes@oracle.com, pfalcato@suse.de, syzkaller-bugs@googlegroups.com, vbabka@suse.cz Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 050f8ad7b58d Add linux-next specific files for 20250616 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=16389e82580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d2efc7740224b93a dashboard link: https://syzkaller.appspot.com/bug?extid=52343d77314d6c0447fe compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11389e82580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16824370580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/49faa18d2f53/disk-050f8ad7.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/7c6f9cd7fe5d/vmlinux-050f8ad7.xz kernel image: https://storage.googleapis.com/syzbot-assets/84a08d6403ee/bzImage-050f8ad7.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+52343d77314d6c0447fe@syzkaller.appspotmail.com ===================================== WARNING: bad unlock balance detected! 6.16.0-rc2-next-20250616-syzkaller #0 Not tainted ------------------------------------- syz-executor359/6969 is trying to release lock (&mapping->i_mmap_rwsem) at: [] i_mmap_unlock_write include/linux/fs.h:557 [inline] [] maybe_drop_rmap_locks mm/mremap.c:197 [inline] [] move_pgt_entry+0xfa7/0x1170 mm/mremap.c:686 but there are no more locks to release! other info that might help us debug this: 1 lock held by syz-executor359/6969: #0: ffff88802f641760 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:374 [inline] #0: ffff88802f641760 (&mm->mmap_lock){++++}-{4:4}, at: do_mremap mm/mremap.c:2371 [inline] #0: ffff88802f641760 (&mm->mmap_lock){++++}-{4:4}, at: __do_sys_mremap mm/mremap.c:2453 [inline] #0: ffff88802f641760 (&mm->mmap_lock){++++}-{4:4}, at: __se_sys_mremap+0x3c0/0xc60 mm/mremap.c:2421 stack backtrace: CPU: 1 UID: 0 PID: 6969 Comm: syz-executor359 Not tainted 6.16.0-rc2-next-20250616-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_unlock_imbalance_bug+0xdc/0xf0 kernel/locking/lockdep.c:5301 __lock_release kernel/locking/lockdep.c:5540 [inline] lock_release+0x269/0x3e0 kernel/locking/lockdep.c:5892 up_write+0x2d/0x420 kernel/locking/rwsem.c:1629 i_mmap_unlock_write include/linux/fs.h:557 [inline] maybe_drop_rmap_locks mm/mremap.c:197 [inline] move_pgt_entry+0xfa7/0x1170 mm/mremap.c:686 move_page_tables+0xcde/0x2940 mm/mremap.c:1367 copy_vma_and_data mm/mremap.c:1807 [inline] move_vma+0xd5e/0x2010 mm/mremap.c:1913 mremap_to+0x7e7/0x8b0 mm/mremap.c:2106 do_mremap mm/mremap.c:2396 [inline] __do_sys_mremap mm/mremap.c:2453 [inline] __se_sys_mremap+0x8f5/0xc60 mm/mremap.c:2421 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f33da2e43b9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 1d 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f33da273168 EFLAGS: 00000246 ORIG_RAX: 0000000000000019 RAX: ffffffffffffffda RBX: 00007f33da3673f8 RCX: 00007f33da2e43b9 RDX: 0000000000200000 RSI: 0000000000600600 RDI: 0000200000000000 RBP: 00007f33da3673f0 R08: 0000200000a00000 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 00007f33da3673fc R13: 000000000000006e R14: 00007ffccf0ef660 R15: 00007ffccf0ef748 ------------[ cut here ]------------ DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff888033554d00, owner = 0x0, curr 0xffff888033b15a00, list empty WARNING: kernel/locking/rwsem.c:1368 at __up_write kernel/locking/rwsem.c:1367 [inline], CPU#1: syz-executor359/6969 WARNING: kernel/locking/rwsem.c:1368 at up_write+0x3a2/0x420 kernel/locking/rwsem.c:1630, CPU#1: syz-executor359/6969 Modules linked in: CPU: 1 UID: 0 PID: 6969 Comm: syz-executor359 Not tainted 6.16.0-rc2-next-20250616-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:__up_write kernel/locking/rwsem.c:1367 [inline] RIP: 0010:up_write+0x3a2/0x420 kernel/locking/rwsem.c:1630 Code: d0 48 c7 c7 60 ee 8a 8b 48 c7 c6 80 f0 8a 8b 48 8b 14 24 4c 89 f1 4d 89 e0 4c 8b 4c 24 08 41 52 e8 23 3b e6 ff 48 83 c4 08 90 <0f> 0b 90 90 e9 6d fd ff ff 48 c7 c1 34 81 a1 8f 80 e1 07 80 c1 03 RSP: 0018:ffffc9000b2ff498 EFLAGS: 00010282 RAX: 636aee1c3dfaec00 RBX: ffff888033554d00 RCX: ffff888033b15a00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002 RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffffbfff1bfaa14 R12: 0000000000000000 R13: ffff888033554d58 R14: ffff888033554d00 R15: 1ffff110066aa9a1 FS: 00007f33da2736c0(0000) GS:ffff888125d40000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f33da29ba90 CR3: 000000002c068000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: i_mmap_unlock_write include/linux/fs.h:557 [inline] maybe_drop_rmap_locks mm/mremap.c:197 [inline] move_pgt_entry+0xfa7/0x1170 mm/mremap.c:686 move_page_tables+0xcde/0x2940 mm/mremap.c:1367 copy_vma_and_data mm/mremap.c:1807 [inline] move_vma+0xd5e/0x2010 mm/mremap.c:1913 mremap_to+0x7e7/0x8b0 mm/mremap.c:2106 do_mremap mm/mremap.c:2396 [inline] __do_sys_mremap mm/mremap.c:2453 [inline] __se_sys_mremap+0x8f5/0xc60 mm/mremap.c:2421 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f33da2e43b9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 1d 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f33da273168 EFLAGS: 00000246 ORIG_RAX: 0000000000000019 RAX: ffffffffffffffda RBX: 00007f33da3673f8 RCX: 00007f33da2e43b9 RDX: 0000000000200000 RSI: 0000000000600600 RDI: 0000200000000000 RBP: 00007f33da3673f0 R08: 0000200000a00000 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 00007f33da3673fc R13: 000000000000006e R14: 00007ffccf0ef660 R15: 00007ffccf0ef748 --- 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 syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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