Hello, syzbot found the following issue on: HEAD commit: fceb07950a7a Merge https://git.kernel.org/pub/scm/linux/ke.. git tree: bpf console output: https://syzkaller.appspot.com/x/log.txt?x=16f9e61ab00000 kernel config: https://syzkaller.appspot.com/x/.config?x=a5d447cdc3ae81d9 dashboard link: https://syzkaller.appspot.com/bug?extid=5b1e53987f858500ec00 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5b1e53987f858500ec00@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ WARNING: CPU: 0 PID: 13724 at fs/namespace.c:1187 mntput_no_expire+0xada/0xcd0 fs/namespace.c:1187 Modules linked in: CPU: 0 PID: 13724 Comm: syz-executor.0 Not tainted 5.15.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:mntput_no_expire+0xada/0xcd0 fs/namespace.c:1187 Code: 30 84 c0 0f 84 b9 fe ff ff 3c 03 0f 8f b1 fe ff ff 4c 89 44 24 10 e8 45 3e ec ff 4c 8b 44 24 10 e9 9d fe ff ff e8 d6 d1 a5 ff <0f> 0b e9 19 fd ff ff e8 ca d1 a5 ff e8 b5 e1 65 07 31 ff 89 c5 89 RSP: 0018:ffffc90003fffc18 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 1ffff920007fff89 RCX: 0000000000000000 RDX: ffff8880746c3a00 RSI: ffffffff81d1a0ba RDI: 0000000000000003 RBP: ffff88807324ad80 R08: 0000000000000000 R09: ffffffff8fd39a0f R10: ffffffff81d19dd1 R11: 0000000000000000 R12: 0000000000000008 R13: ffffc90003fffc68 R14: 00000000ffffffff R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fee49cd9c18 CR3: 0000000030b77000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: <TASK> mntput fs/namespace.c:1233 [inline] namespace_unlock+0x26b/0x410 fs/namespace.c:1452 drop_collected_mounts fs/namespace.c:1935 [inline] put_mnt_ns fs/namespace.c:4344 [inline] put_mnt_ns+0x106/0x140 fs/namespace.c:4340 free_nsproxy+0x43/0x4c0 kernel/nsproxy.c:191 put_nsproxy include/linux/nsproxy.h:105 [inline] switch_task_namespaces+0xad/0xc0 kernel/nsproxy.c:249 do_exit+0xba5/0x2a20 kernel/exit.c:825 do_group_exit+0x125/0x310 kernel/exit.c:923 __do_sys_exit_group kernel/exit.c:934 [inline] __se_sys_exit_group kernel/exit.c:932 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:932 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fee49bf8ae9 Code: Unable to access opcode bytes at RIP 0x7fee49bf8abf. RSP: 002b:00007ffe70646608 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000029 RCX: 00007fee49bf8ae9 RDX: 00007fee49bfa13a RSI: 0000000000000000 RDI: 0000000000000007 RBP: 0000000000000007 R08: ffffffffffff0000 R09: 0000000000000029 R10: 00000000000003b8 R11: 0000000000000246 R12: 00007ffe70646c70 R13: 0000000000000003 R14: 00007ffe70646c0c R15: 00007fee49cd9b60 </TASK> --- 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@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
