From: syzbot ci <syzbot+ci8a1a6021291643b0@syzkaller.appspotmail.com>
To: akpm@linux-foundation.org, david@kernel.org, jannh@google.com,
liam@infradead.org, liavalb@gmail.com,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
ljs@kernel.org, mhocko@suse.com, pfalcato@suse.de,
rppt@kernel.org, surenb@google.com, vbabka@kernel.org
Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com
Subject: [syzbot ci] Re: Fix an imbalanced file ref count in the mmap syscall
Date: Sat, 18 Jul 2026 12:05:28 -0700 [thread overview]
Message-ID: <6a5bce78.f1649fcc.2a4208.0321.GAE@google.com> (raw)
In-Reply-To: <20260718123417.16339-1-liavalb@gmail.com>
syzbot ci has tested the following series
[v1] Fix an imbalanced file ref count in the mmap syscall
https://lore.kernel.org/all/20260718123417.16339-1-liavalb@gmail.com
* [PATCH] mm/vma: fix imbalanced file reference count, properly abort mmap_prepare
and found the following issue:
WARNING in tear_down_vmas
Full report is available here:
https://ci.syzbot.org/series/63d42f9f-f249-4678-8916-5464a15accd6
***
WARNING in tear_down_vmas
tree: mm-new
URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/akpm/mm.git
base: 3827fe994db98623a5a619a72f15f57bf8274deb
arch: amd64
compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6
config: https://ci.syzbot.org/builds/f57e989a-6273-4413-b35d-20dab5a41e92/config
syz repro: https://ci.syzbot.org/findings/8f36751f-0976-460a-b5ab-de97c9074c0a/syz_repro
------------[ cut here ]------------
!vma_is_attached(vma)
WARNING: ./include/linux/mmap_lock.h:435 at vma_assert_attached include/linux/mmap_lock.h:435 [inline], CPU#0: syz.2.19/5813
WARNING: ./include/linux/mmap_lock.h:435 at vma_mark_detached include/linux/mmap_lock.h:455 [inline], CPU#0: syz.2.19/5813
WARNING: ./include/linux/mmap_lock.h:435 at tear_down_vmas+0x381/0x520 mm/mmap.c:1261, CPU#0: syz.2.19/5813
Modules linked in:
CPU: 0 UID: 0 PID: 5813 Comm: syz.2.19 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:vma_assert_attached include/linux/mmap_lock.h:435 [inline]
RIP: 0010:vma_mark_detached include/linux/mmap_lock.h:455 [inline]
RIP: 0010:tear_down_vmas+0x381/0x520 mm/mmap.c:1261
Code: 48 89 df e8 01 46 16 00 48 8b 44 24 18 48 39 03 0f 87 e0 00 00 00 e8 ce a8 a8 ff ff 44 24 04 e9 9a fd ff ff e8 c0 a8 a8 ff 90 <0f> 0b 90 e9 2c ff ff ff e8 b2 a8 a8 ff 90 0f 0b 90 e9 94 fe ff ff
RSP: 0018:ffffc90003cdf7e0 EFLAGS: 00010293
RAX: ffffffff821dbb90 RBX: ffff888115e14b40 RCX: ffff888171f9bb80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003cdf920 R08: ffff888115e14b43 R09: 1ffff11022bc2968
R10: dffffc0000000000 R11: ffffed1022bc2969 R12: ffff888115e14a80
R13: 0000000000000001 R14: 0000000000000000 R15: dffffc0000000000
FS: 00007f15b88e36c0(0000) GS:ffff88818dc1c000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9033eab095 CR3: 0000000173ace000 CR4: 00000000000006f0
Call Trace:
<TASK>
exit_mmap+0x4ca/0x9f0 mm/mmap.c:1320
__mmput+0x118/0x420 kernel/fork.c:1187
exit_mm+0x221/0x2d0 kernel/exit.c:610
do_exit+0x6cd/0x2360 kernel/exit.c:992
do_group_exit+0x22d/0x2f0 kernel/exit.c:1147
get_signal+0x121b/0x12c0 kernel/signal.c:3038
arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
exit_to_user_mode_loop+0x104/0x730 kernel/entry/common.c:101
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
do_syscall_64+0x353/0x580 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f15b799ce59
Code: Unable to access opcode bytes at 0x7f15b799ce2f.
RSP: 002b:00007f15b88e30e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f15b7c15fa8 RCX: 00007f15b799ce59
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f15b7c15fa8
RBP: 00007f15b7c15fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f15b7c16038 R14: 00007ffe1b61d9f0 R15: 00007ffe1b61dad8
</TASK>
***
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 patch for this bug, please reply with `#syz test`
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prev parent reply other threads:[~2026-07-18 19:05 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-18 12:34 [PATCH 0/1] Fix an imbalanced file ref count in the mmap syscall Liav Albani
2026-07-18 12:34 ` [PATCH] mm/vma: fix imbalanced file reference count, properly abort mmap_prepare Liav Albani
2026-07-18 14:17 ` Lorenzo Stoakes (ARM)
2026-07-18 14:25 ` Liav Albani
2026-07-18 13:25 ` [PATCH 0/1] Fix an imbalanced file ref count in the mmap syscall Pedro Falcato
2026-07-18 14:05 ` Lorenzo Stoakes (ARM)
2026-07-18 19:05 ` syzbot ci [this message]
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