------------[ cut here ]------------ WARNING: CPU: 1 PID: 13775 at fs/namespace.c:1187 mntput_no_expire+0xada/0xcd0 fs/namespace.c:1187 Modules linked in: CPU: 1 PID: 13775 Comm: syz-executor.2 Not tainted 5.15.0-rc1-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 b5 f9 eb ff 4c 8b 44 24 10 e9 9d fe ff ff e8 06 9b a4 ff <0f> 0b e9 19 fd ff ff e8 fa 9a a4 ff e8 25 7b 63 07 31 ff 89 c5 89 RSP: 0000:ffffc90004427c18 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 1ffff92000884f89 RCX: 0000000000000000 RDX: ffff888028bd0000 RSI: ffffffff81d170aa RDI: 0000000000000003 RBP: ffff88802e4eb680 R08: 0000000000000000 R09: ffffffff8fcff92f R10: ffffffff81d16dc1 R11: 0000000000000000 R12: 0000000000000008 R13: ffffc90004427c68 R14: 00000000ffffffff R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000180 CR3: 000000000b68e000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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+0xaf/0xd0 kernel/nsproxy.c:249 do_exit+0xba9/0x2a30 kernel/exit.c:824 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_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: 0033:0x7fa8dfb85709 Code: Unable to access opcode bytes at RIP 0x7fa8dfb856df. RSP: 002b:00007ffd81ec5a88 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fa8dfb85709 RDX: 00007fa8dfb86d4a RSI: 0000000000000000 RDI: 0000000000000007 RBP: 0000000000000007 R08: fefefefefeff646b R09: 0000000000000000 R10: 0000000000000408 R11: 0000000000000246 R12: 00007ffd81ec60f0 R13: 0000000000000003 R14: 00007ffd81ec608c R15: 00007fa8dfc67aa0