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Thu, 01 Apr 2021 02:09:20 -0700 (PDT) Date: Thu, 01 Apr 2021 02:09:20 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000003a565e05bee596f2@google.com> Subject: [syzbot] WARNING in mntput_no_expire (2) From: syzbot To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: d19cc4bf Merge tag 'trace-v5.12-rc5' of git://git.kernel.o.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1018f281d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=d1a3d65a48dbd1bc dashboard link: https://syzkaller.appspot.com/bug?extid=c88a7030da47945a3cc3 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12f50d11d00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=137694a1d00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c88a7030da47945a3cc3@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: CPU: 1 PID: 8409 at fs/namespace.c:1186 mntput_no_expire+0xaca/0xcb0 fs/namespace.c:1186 Modules linked in: CPU: 1 PID: 8409 Comm: syz-executor035 Not tainted 5.12.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:mntput_no_expire+0xaca/0xcb0 fs/namespace.c:1186 Code: ff 48 c7 c2 e0 cb 78 89 be c2 02 00 00 48 c7 c7 a0 cb 78 89 c6 05 e5 6d e5 0b 01 e8 ff e1 f6 06 e9 3f fd ff ff e8 c6 a5 a8 ff <0f> 0b e9 fc fc ff ff e8 ba a5 a8 ff e8 55 dc 94 ff 31 ff 89 c5 89 RSP: 0018:ffffc9000165fc78 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 1ffff920002cbf95 RCX: 0000000000000000 RDX: ffff88802072d4c0 RSI: ffffffff81cb4b8a RDI: 0000000000000003 RBP: ffff888011656900 R08: 0000000000000000 R09: ffffffff8fa978af R10: ffffffff81cb4884 R11: 0000000000000000 R12: 0000000000000008 R13: ffffc9000165fcc8 R14: dffffc0000000000 R15: 00000000ffffffff FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055a722053160 CR3: 000000000bc8e000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: mntput fs/namespace.c:1232 [inline] cleanup_mnt+0x523/0x530 fs/namespace.c:1132 task_work_run+0xdd/0x1a0 kernel/task_work.c:140 exit_task_work include/linux/task_work.h:30 [inline] do_exit+0xbfc/0x2a60 kernel/exit.c:825 do_group_exit+0x125/0x310 kernel/exit.c:922 __do_sys_exit_group kernel/exit.c:933 [inline] __se_sys_exit_group kernel/exit.c:931 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:931 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x446af9 Code: Unable to access opcode bytes at RIP 0x446acf. RSP: 002b:00000000005dfe48 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00000000004ce450 RCX: 0000000000446af9 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001 RBP: 0000000000000001 R08: ffffffffffffffbc R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004ce450 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 --- 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. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches