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Sat, 02 May 2026 04:25:32 -0700 (PDT) Date: Sat, 02 May 2026 04:25:32 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69f5df2c.050a0220.3cbe47.0017.GAE@google.com> Subject: [syzbot] [mm?] WARNING: bad unlock balance in do_fault 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-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: D63A940005 X-Stat-Signature: oqmfqq1fqyahj8fgqkdg8jnud4mwm7w7 X-Rspam-User: X-HE-Tag: 1777721133-664880 X-HE-Meta: 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 /MYUMhWm 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 83ECdq84 AetFyPshcKvRQb7zw5qnMU9Jbjlssn3waIa/H65BxEf6i1a7YR2PVKjQcUQ3E5QbtZ0ieIfOeK5kNkjiHpVrAsuVs2jGa/rRsItgwTEGpZHJuRwPXSkGWEgVShsmxvU2aqAwefncUj3X4RzLY5oFbjDBMYVF6kP9KR15H8w/rEDOEFGoXcIqRQowts0aUiRhsAmi/NIrty8aLz29sewMgE1clLqqKjeh1mww5Wt9ejLk1EGGBjvfDwhHPbzN6mNCXvq46fdyToe1zWiKCxc5e4nAOJqZiIBH3142WTBz4FTtlntkK9wIHRy5IyYgMSgBSIHQQEz+d8J8ukBfENYeN8Ed5lhOta5Ssf4ZdQh2ioS0wS1CHHIkRUDNVCvlJHhGMD8LrKMxCNBpsrjNx3vTNzrJ7uqUkzGATsInvsxEJex3IZHVdgP04AuZ61ioAlI7e9xblPOlh4Xc44+m+eNnju3UnTQp9x24 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: 3b3bea6d4b9c Merge tag 'cgroup-for-7.1-rc1-fixes' of git:/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11dbb326580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d0f0911eedbc130a dashboard link: https://syzkaller.appspot.com/bug?extid=c4f59f1ba89c777b77d4 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-3b3bea6d.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/90f65aee39f9/vmlinux-3b3bea6d.xz kernel image: https://storage.googleapis.com/syzbot-assets/9c44f0af2bac/bzImage-3b3bea6d.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c4f59f1ba89c777b77d4@syzkaller.appspotmail.com ===================================== WARNING: bad unlock balance detected! syzkaller #0 Not tainted ------------------------------------- dhcpcd-run-hook/5691 is trying to release lock (rcu_read_lock) at: [] rcu_lock_release include/linux/rcupdate.h:310 [inline] [] rcu_read_unlock include/linux/rcupdate.h:869 [inline] [] do_fault_around mm/memory.c:5854 [inline] [] do_read_fault mm/memory.c:5884 [inline] [] do_fault+0x9b4/0x1750 mm/memory.c:6027 but there are no more locks to release! other info that might help us debug this: 1 lock held by dhcpcd-run-hook/5691: #0: ffff888024e92a88 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x11d/0x590 mm/mmap_lock.c:310 stack backtrace: CPU: 3 UID: 0 PID: 5691 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_lock_release include/linux/rcupdate.h:310 [inline] rcu_read_unlock include/linux/rcupdate.h:869 [inline] do_fault_around mm/memory.c:5854 [inline] do_read_fault mm/memory.c:5884 [inline] do_fault+0x9b9/0x1750 mm/memory.c:6027 do_pte_missing mm/memory.c:4550 [inline] handle_pte_fault mm/memory.c:6411 [inline] __handle_mm_fault+0x187d/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: 0033:0x7ff2e82ebfeb Code: 08 48 8b 78 08 48 89 13 e8 5e f9 ff ff 97 e8 bb ff ff ff 48 09 e8 40 0f 95 c5 40 0f b6 ed eb 04 48 83 2b 08 48 95 5a 5b 5d c3 <55> 53 89 fb 48 83 ec 18 48 8b 3e 48 89 74 24 08 e8 a9 e7 f9 ff 80 RSP: 002b:00007fff321b8cc8 EFLAGS: 00010287 RAX: 00007ff2e8336190 RBX: 0000564f23c56910 RCX: 0000000000000002 RDX: 0000564f23c56910 RSI: 0000564f23c5f120 RDI: 0000000000000004 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000020 R10: 0000000000000040 R11: 0000000000000000 R12: 0000564f23c5ee50 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 ------------[ 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/5691 WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x235/0x5e0 kernel/rcu/tree_plugin.h:430, CPU#3: dhcpcd-run-hook/5691 Modules linked in: CPU: 3 UID: 0 PID: 5691 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 92 a3 da ff e8 fd de 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 f0 9c 09 e8 84 60 87 RSP: 0000:ffffc90003f9fbe8 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff88802a16a500 RCX: ffffffff81e7203e RDX: 0000000000000000 RSI: ffffffff8def466d RDI: ffff88802a16a9c4 RBP: 0000000000000100 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000000 R11: 0000000000000012 R12: 0000000000000001 R13: 00000000000000e0 R14: ffffc90003f9fd68 R15: 00000000000000f0 FS: 00007ff2e7fcfc80(0000) GS:ffff888097480000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff2e82ebfeb CR3: 0000000050d47000 CR4: 0000000000352ef0 Call Trace: rcu_read_unlock include/linux/rcupdate.h:871 [inline] do_fault_around mm/memory.c:5854 [inline] do_read_fault mm/memory.c:5884 [inline] do_fault+0x9be/0x1750 mm/memory.c:6027 do_pte_missing mm/memory.c:4550 [inline] handle_pte_fault mm/memory.c:6411 [inline] __handle_mm_fault+0x187d/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: 0033:0x7ff2e82ebfeb Code: 08 48 8b 78 08 48 89 13 e8 5e f9 ff ff 97 e8 bb ff ff ff 48 09 e8 40 0f 95 c5 40 0f b6 ed eb 04 48 83 2b 08 48 95 5a 5b 5d c3 <55> 53 89 fb 48 83 ec 18 48 8b 3e 48 89 74 24 08 e8 a9 e7 f9 ff 80 RSP: 002b:00007fff321b8cc8 EFLAGS: 00010287 RAX: 00007ff2e8336190 RBX: 0000564f23c56910 RCX: 0000000000000002 RDX: 0000564f23c56910 RSI: 0000564f23c5f120 RDI: 0000000000000004 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000020 R10: 0000000000000040 R11: 0000000000000000 R12: 0000564f23c5ee50 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000 --- 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