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Sun, 26 Apr 2026 01:17:25 -0700 (PDT) Date: Sun, 26 Apr 2026 01:17:25 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69edca15.170a0220.38e3f1.0000.GAE@google.com> Subject: [syzbot] [mm?] WARNING: bad unlock balance in do_wp_page From: syzbot To: Liam.Howlett@oracle.com, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, ljs@kernel.org, shakeel.butt@linux.dev, surenb@google.com, syzkaller-bugs@googlegroups.com, vbabka@kernel.org Content-Type: text/plain; charset="UTF-8" X-Stat-Signature: hpywnxjrtxfkhf9s65pdpfuidij9dy4k X-Rspamd-Queue-Id: 4E0A420005 X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1777191446-497449 X-HE-Meta: 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 B55OZ4h4 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 xQbBqpR5 nO3dnAeuC6L1JNOtUjyhuK6KYrB/f1/Ts1i28DYnZbR0VYC8dQYGu0rXzszrP00r5+LhLI6kKOCzBPcmaf52i8eOan/dOwfo2mJDcMT7AIh5F7PpFkWkjh1tjv5gBAG56GqeiWGM80/Kg9hQ76sofBWWj50rCvW3CPbekPAKDLZYAD/w8/ui3NzVGfvevMsbwuIvnkpy+6ZbAfWJEboMBoHjusKFlnXAdCIBFF7EskRtAxJPlfKkZUPPKQhB0tyJIe4AXF1rg/Hs9Q9ZryIdnecU3mPHqE8JuQdRCaOcF98fSSUCUtRLFRDu2c9n5mdc0XTZoy2d5ZCvsBeuf89IieyqWbONtmd5bMBImCtOU31ZwKjSpDVpZAw2YyAQoDGTnovU8if7wpPF3tz66GX4jCFWWPHCBAMV4hFqpstYsJJ5P2cecHiLmUQGqadrIjbQy2uaYj76+juvFRvbylsu87hIz2wijf9d 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: 6596a02b2078 Merge tag 'drm-next-2026-04-22' of https://gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12483702580000 kernel config: https://syzkaller.appspot.com/x/.config?x=24c8da4692f901cb dashboard link: https://syzkaller.appspot.com/bug?extid=7d60b33a8a546263da7c compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-6596a02b.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c5a50c04af50/vmlinux-6596a02b.xz kernel image: https://storage.googleapis.com/syzbot-assets/70da0dbf8561/bzImage-6596a02b.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+7d60b33a8a546263da7c@syzkaller.appspotmail.com ===================================== WARNING: bad unlock balance detected! syzkaller #0 Not tainted ------------------------------------- dhcpcd-run-hook/5941 is trying to release lock (rcu_read_lock) at: [] rcu_read_unlock+0x2d/0xb0 include/linux/rcupdate.h:867 but there are no more locks to release! other info that might help us debug this: 1 lock held by dhcpcd-run-hook/5941: #0: ffff8880440f3d48 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x11d/0x590 mm/mmap_lock.c:310 stack backtrace: CPU: 2 UID: 0 PID: 5941 Comm: dhcpcd-run-hook Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_unlock_imbalance_bug.part.0+0xfb/0x106 kernel/locking/lockdep.c:5298 print_unlock_imbalance_bug kernel/locking/lockdep.c:5278 [inline] __lock_release kernel/locking/lockdep.c:5537 [inline] lock_release kernel/locking/lockdep.c:5889 [inline] lock_release+0x28d/0x310 kernel/locking/lockdep.c:5875 rcu_read_unlock+0x32/0xb0 include/linux/rcupdate.h:867 pte_unmap include/linux/pgtable.h:117 [inline] wp_page_copy mm/memory.c:3960 [inline] do_wp_page+0x13d7/0x4350 mm/memory.c:4320 handle_pte_fault mm/memory.c:6427 [inline] __handle_mm_fault+0x1ab6/0x2a00 mm/memory.c:6549 handle_mm_fault+0x36d/0xa20 mm/memory.c:6718 do_user_addr_fault+0x5a3/0x12f0 arch/x86/mm/fault.c:1334 handle_page_fault arch/x86/mm/fault.c:1474 [inline] exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1527 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 RIP: 0033:0x7f7501c33f87 Code: 5c 25 28 49 8b 57 10 48 85 db 74 27 8b 74 24 0c 23 73 08 44 39 f6 75 16 48 39 c2 75 05 e8 62 ff ff ff 48 8b 53 10 48 83 c0 08 <48> 89 50 f8 48 8b 1b eb d0 49 83 c4 08 49 81 fc 38 01 00 00 75 be RSP: 002b:00007ffd29921270 EFLAGS: 00010212 RAX: 00005645dcc81140 RBX: 00005645dcc716d0 RCX: 0000000000000002 RDX: 00007ffd29925f83 RSI: 0000000000000001 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000008 R13: 00005645dcc70e60 R14: 0000000000000001 R15: 00005645dcc70c30 ------------[ cut here ]------------ rrln < 0 || rrln > RCU_NEST_PMAX WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock kernel/rcu/tree_plugin.h:443 [inline], CPU#3: dhcpcd-run-hook/5941 WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x235/0x5e0 kernel/rcu/tree_plugin.h:430, CPU#3: dhcpcd-run-hook/5941 Modules linked in: CPU: 3 UID: 0 PID: 5941 Comm: dhcpcd-run-hook Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:__rcu_read_unlock kernel/rcu/tree_plugin.h:443 [inline] RIP: 0010:__rcu_read_unlock+0x235/0x5e0 kernel/rcu/tree_plugin.h:430 Code: 74 11 c7 45 58 01 00 00 00 bf 09 00 00 00 e8 12 a5 da ff e8 9d e2 22 00 9c 58 f6 c4 02 0f 85 dd 02 00 00 fb e9 57 fe ff ff 90 <0f> 0b 90 5b 5d 41 5c 41 5d 41 5e 41 5f e9 d9 14 ad 09 e8 44 64 87 RSP: 0000:ffffc900049c7af0 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff888029ec4a00 RCX: ffffffff81e80bfe RDX: 0000000000000000 RSI: ffffffff8df2fec2 RDI: ffff888029ec4ec4 RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000000 R11: 0000000000000012 R12: ffff88802ad93408 R13: ffffea0000ad7800 R14: 0000000000000000 R15: ffffea0000ad7800 FS: 00007f7501945c80(0000) GS:ffff8880973e2000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005645dcc70950 CR3: 00000000297d6000 CR4: 0000000000352ef0 Call Trace: pte_unmap include/linux/pgtable.h:117 [inline] wp_page_copy mm/memory.c:3960 [inline] do_wp_page+0x13d7/0x4350 mm/memory.c:4320 handle_pte_fault mm/memory.c:6427 [inline] __handle_mm_fault+0x1ab6/0x2a00 mm/memory.c:6549 handle_mm_fault+0x36d/0xa20 mm/memory.c:6718 do_user_addr_fault+0x5a3/0x12f0 arch/x86/mm/fault.c:1334 handle_page_fault arch/x86/mm/fault.c:1474 [inline] exc_page_fault+0x6f/0xd0 arch/x86/mm/fault.c:1527 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 RIP: 0033:0x7f7501c33f87 Code: 5c 25 28 49 8b 57 10 48 85 db 74 27 8b 74 24 0c 23 73 08 44 39 f6 75 16 48 39 c2 75 05 e8 62 ff ff ff 48 8b 53 10 48 83 c0 08 <48> 89 50 f8 48 8b 1b eb d0 49 83 c4 08 49 81 fc 38 01 00 00 75 be RSP: 002b:00007ffd29921270 EFLAGS: 00010212 RAX: 00005645dcc81140 RBX: 00005645dcc716d0 RCX: 0000000000000002 RDX: 00007ffd29925f83 RSI: 0000000000000001 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000008 R13: 00005645dcc70e60 R14: 0000000000000001 R15: 00005645dcc70c30 --- 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