------------[ cut here ]------------ WARNING: CPU: 0 PID: 5893 at fs/namespace.c:1168 rcu_read_unlock include/linux/rcupdate.h:698 [inline] WARNING: CPU: 0 PID: 5893 at fs/namespace.c:1168 mntput_no_expire+0x852/0xac0 fs/namespace.c:1169 Modules linked in: CPU: 0 PID: 5893 Comm: syz-executor.0 Not tainted 5.11.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:mntput_no_expire+0x852/0xac0 fs/namespace.c:1168 Code: 0f 85 f3 fd ff ff 48 c7 c2 60 70 97 88 be ba 02 00 00 48 c7 c7 20 70 97 88 c6 05 66 c8 6c 0a 01 e8 1d 11 41 06 e9 cf fd ff ff <0f> 0b e9 b2 fd ff ff e8 02 59 a5 ff 84 c0 0f 85 15 fe ff ff 48 c7 RSP: 0018:ffffc9000189fc40 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 1ffff92000313f8e RCX: 0000000000000002 RDX: 0000000000000008 RSI: 0000000000000000 RDI: ffffffff8c324950 RBP: ffffc9000189fc90 R08: 0000000000000008 R09: ffffffff8e1497ef R10: fffffbfff1c292fd R11: 00000000000002ba R12: 00000000ffffffff R13: 0000000000000007 R14: ffff888025cca780 R15: dffffc0000000000 FS: 0000555556cc0400(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555556838848 CR3: 00000000167a9000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: mntput fs/namespace.c:1214 [inline] namespace_unlock+0x31f/0x3c0 fs/namespace.c:1432 do_umount fs/namespace.c:1651 [inline] path_umount+0x66a/0xfe0 fs/namespace.c:1737 ksys_umount fs/namespace.c:1760 [inline] __do_sys_umount fs/namespace.c:1765 [inline] __se_sys_umount fs/namespace.c:1763 [inline] __x64_sys_umount+0xfb/0x120 fs/namespace.c:1763 do_syscall_64+0x2d/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f5e4c7c0557 Code: ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fffeb2f92e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f5e4c7c0557 RDX: 00007fffeb2f93b9 RSI: 000000000000000a RDI: 00007fffeb2f93b0 RBP: 00007fffeb2f93b0 R08: 00000000ffffffff R09: 00007fffeb2f9180 R10: 0000555556cc18b3 R11: 0000000000000246 R12: 00007f5e4c8181f8 R13: 00007fffeb2fa470 R14: 0000555556cc1810 R15: 00007fffeb2fa4b0 irq event stamp: 180397 hardirqs last enabled at (180409): [] asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:629 hardirqs last disabled at (180418): [] console_unlock+0x626/0x8d0 kernel/printk/printk.c:2514 softirqs last enabled at (179964): [] asm_call_irq_on_stack+0xf/0x20 softirqs last disabled at (179759): [] asm_call_irq_on_stack+0xf/0x20 ---[ end trace 9e255b5c7c5f826b ]--- ------------[ cut here ]------------ WARNING: CPU: 0 PID: 5893 at fs/namespace.c:1168 rcu_read_unlock include/linux/rcupdate.h:698 [inline] WARNING: CPU: 0 PID: 5893 at fs/namespace.c:1168 mntput_no_expire+0x852/0xac0 fs/namespace.c:1169