syzbot


INFO: task hung in copy_mnt_ns

Status: closed as invalid on 2022/02/08 09:50
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 337d, last: 327d
similar bugs (1):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 INFO: task hung in copy_mnt_ns 4 317d 345d 0/1 auto-closed as invalid on 2022/05/20 11:54

Sample crash report:
INFO: task syz-executor.4:4377 blocked for more than 143 seconds.
      Not tainted 5.16.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4  state:D stack:22544 pid: 4377 ppid: 11255 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4972 [inline]
 __schedule+0xb72/0x1460 kernel/sched/core.c:6253
 schedule+0x12b/0x1f0 kernel/sched/core.c:6326
 rwsem_down_write_slowpath+0xdb7/0x1480 kernel/locking/rwsem.c:1151
 __down_write_common kernel/locking/rwsem.c:1268 [inline]
 __down_write kernel/locking/rwsem.c:1277 [inline]
 down_write+0x163/0x170 kernel/locking/rwsem.c:1524
 namespace_lock fs/namespace.c:1458 [inline]
 copy_mnt_ns+0x113/0xd30 fs/namespace.c:3423
 create_new_namespaces+0xd2/0xa00 kernel/nsproxy.c:78
 copy_namespaces+0x333/0x390 kernel/nsproxy.c:178
 copy_process+0x2968/0x5ca0 kernel/fork.c:2194
 kernel_clone+0x22a/0x7e0 kernel/fork.c:2582
 __do_sys_clone kernel/fork.c:2699 [inline]
 __se_sys_clone kernel/fork.c:2683 [inline]
 __x64_sys_clone+0x245/0x2b0 kernel/fork.c:2683
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f3579a82e99
RSP: 002b:00007f35783d7168 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f3579b96030 RCX: 00007f3579a82e99
RDX: 0000000020000740 RSI: 0000000020000700 RDI: 00000000a0020000
RBP: 00007f3579adcff1 R08: 00000000200007c0 R09: 0000000000000000
R10: 0000000020000780 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffda938d2df R14: 00007f35783d7300 R15: 0000000000022000
 </TASK>
INFO: task syz-executor.4:4381 blocked for more than 144 seconds.
      Not tainted 5.16.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4  state:D stack:23504 pid: 4381 ppid: 11255 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4972 [inline]
 __schedule+0xb72/0x1460 kernel/sched/core.c:6253
 schedule+0x12b/0x1f0 kernel/sched/core.c:6326
 rwsem_down_write_slowpath+0xdb7/0x1480 kernel/locking/rwsem.c:1151
 __down_write_common kernel/locking/rwsem.c:1268 [inline]
 __down_write kernel/locking/rwsem.c:1277 [inline]
 down_write+0x163/0x170 kernel/locking/rwsem.c:1524
 namespace_lock fs/namespace.c:1458 [inline]
 copy_mnt_ns+0x113/0xd30 fs/namespace.c:3423
 create_new_namespaces+0xd2/0xa00 kernel/nsproxy.c:78
 copy_namespaces+0x333/0x390 kernel/nsproxy.c:178
 copy_process+0x2968/0x5ca0 kernel/fork.c:2194
 kernel_clone+0x22a/0x7e0 kernel/fork.c:2582
 __do_sys_clone kernel/fork.c:2699 [inline]
 __se_sys_clone kernel/fork.c:2683 [inline]
 __x64_sys_clone+0x245/0x2b0 kernel/fork.c:2683
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f3579a82e99
RSP: 002b:00007f35783d7168 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f3579b96030 RCX: 00007f3579a82e99
RDX: 0000000020000740 RSI: 0000000020000700 RDI: 00000000a0020000
RBP: 00007f3579adcff1 R08: 00000000200007c0 R09: 0000000000000000
R10: 0000000020000780 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffda938d2df R14: 00007f35783d7300 R15: 0000000000022000
 </TASK>
INFO: task syz-executor.4:4383 blocked for more than 145 seconds.
      Not tainted 5.16.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4  state:D
 stack:23472 pid: 4383 ppid:  4381 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4972 [inline]
 __schedule+0xb72/0x1460 kernel/sched/core.c:6253
 schedule+0x12b/0x1f0 kernel/sched/core.c:6326
 rwsem_down_write_slowpath+0xdb7/0x1480 kernel/locking/rwsem.c:1151
 __down_write_common kernel/locking/rwsem.c:1268 [inline]
 __down_write kernel/locking/rwsem.c:1277 [inline]
 down_write+0x163/0x170 kernel/locking/rwsem.c:1524
 namespace_lock fs/namespace.c:1458 [inline]
 copy_mnt_ns+0x113/0xd30 fs/namespace.c:3423
 create_new_namespaces+0xd2/0xa00 kernel/nsproxy.c:78
 copy_namespaces+0x333/0x390 kernel/nsproxy.c:178
 copy_process+0x2968/0x5ca0 kernel/fork.c:2194
 kernel_clone+0x22a/0x7e0 kernel/fork.c:2582
 __do_sys_clone kernel/fork.c:2699 [inline]
 __se_sys_clone kernel/fork.c:2683 [inline]
 __x64_sys_clone+0x245/0x2b0 kernel/fork.c:2683
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f3579a82e99
RSP: 002b:00007f35783d7168 EFLAGS: 00000246
 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f3579b96030 RCX: 00007f3579a82e99
RDX: 0000000020000740 RSI: 0000000020000700 RDI: 00000000a0020000
RBP: 00007f3579adcff1 R08: 00000000200007c0 R09: 0000000000000000
R10: 0000000020000780 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffda938d2df R14: 00007f35783d7300 R15: 0000000000022000
 </TASK>
INFO: task syz-executor.4:4390 blocked for more than 146 seconds.
      Not tainted 5.16.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4  state:D
 stack:22192 pid: 4390 ppid: 11255 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4972 [inline]
 __schedule+0xb72/0x1460 kernel/sched/core.c:6253
 schedule+0x12b/0x1f0 kernel/sched/core.c:6326
 rwsem_down_write_slowpath+0xdb7/0x1480 kernel/locking/rwsem.c:1151
 __down_write_common kernel/locking/rwsem.c:1268 [inline]
 __down_write kernel/locking/rwsem.c:1277 [inline]
 down_write+0x163/0x170 kernel/locking/rwsem.c:1524
 namespace_lock fs/namespace.c:1458 [inline]
 copy_mnt_ns+0x113/0xd30 fs/namespace.c:3423
 create_new_namespaces+0xd2/0xa00 kernel/nsproxy.c:78
 copy_namespaces+0x333/0x390 kernel/nsproxy.c:178
 copy_process+0x2968/0x5ca0 kernel/fork.c:2194
 kernel_clone+0x22a/0x7e0 kernel/fork.c:2582
 __do_sys_clone kernel/fork.c:2699 [inline]
 __se_sys_clone kernel/fork.c:2683 [inline]
 __x64_sys_clone+0x245/0x2b0 kernel/fork.c:2683
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f3579a82e99
RSP: 002b:00007f35783d7168 EFLAGS: 00000246
 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f3579b96030 RCX: 00007f3579a82e99
RDX: 0000000020000740 RSI: 0000000020000700 RDI: 00000000a0020000
RBP: 00007f3579adcff1 R08: 00000000200007c0 R09: 0000000000000000
R10: 0000000020000780 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffda938d2df R14: 00007f35783d7300 R15: 0000000000022000
 </TASK>
INFO: task syz-executor.4:4394 blocked for more than 147 seconds.
      Not tainted 5.16.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4  state:D
 stack:22928 pid: 4394 ppid:  4385 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4972 [inline]
 __schedule+0xb72/0x1460 kernel/sched/core.c:6253
 schedule+0x12b/0x1f0 kernel/sched/core.c:6326
 rwsem_down_write_slowpath+0xdb7/0x1480 kernel/locking/rwsem.c:1151
 __down_write_common kernel/locking/rwsem.c:1268 [inline]
 __down_write kernel/locking/rwsem.c:1277 [inline]
 down_write+0x163/0x170 kernel/locking/rwsem.c:1524
 namespace_lock fs/namespace.c:1458 [inline]
 copy_mnt_ns+0x113/0xd30 fs/namespace.c:3423
 create_new_namespaces+0xd2/0xa00 kernel/nsproxy.c:78
 copy_namespaces+0x333/0x390 kernel/nsproxy.c:178
 copy_process+0x2968/0x5ca0 kernel/fork.c:2194
 kernel_clone+0x22a/0x7e0 kernel/fork.c:2582
 __do_sys_clone kernel/fork.c:2699 [inline]
 __se_sys_clone kernel/fork.c:2683 [inline]
 __x64_sys_clone+0x245/0x2b0 kernel/fork.c:2683
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f3579a82e99
RSP: 002b:00007f35783d7168 EFLAGS: 00000246
 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f3579b96030 RCX: 00007f3579a82e99
RDX: 0000000020000740 RSI: 0000000020000700 RDI: 00000000a0020000
RBP: 00007f3579adcff1 R08: 00000000200007c0 R09: 0000000000000000
R10: 0000000020000780 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffda938d2df R14: 00007f35783d7300 R15: 0000000000022000
 </TASK>
INFO: task syz-executor.4:4402 blocked for more than 148 seconds.
      Not tainted 5.16.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4  state:D stack:22808 pid: 4402 ppid:  4390 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4972 [inline]
 __schedule+0xb72/0x1460 kernel/sched/core.c:6253
 schedule+0x12b/0x1f0 kernel/sched/core.c:6326
 rwsem_down_write_slowpath+0xdb7/0x1480 kernel/locking/rwsem.c:1151
 __down_write_common kernel/locking/rwsem.c:1268 [inline]
 __down_write kernel/locking/rwsem.c:1277 [inline]
 down_write+0x163/0x170 kernel/locking/rwsem.c:1524
 namespace_lock fs/namespace.c:1458 [inline]
 copy_mnt_ns+0x113/0xd30 fs/namespace.c:3423
 create_new_namespaces+0xd2/0xa00 kernel/nsproxy.c:78
 copy_namespaces+0x333/0x390 kernel/nsproxy.c:178
 copy_process+0x2968/0x5ca0 kernel/fork.c:2194
 kernel_clone+0x22a/0x7e0 kernel/fork.c:2582
 __do_sys_clone kernel/fork.c:2699 [inline]
 __se_sys_clone kernel/fork.c:2683 [inline]
 __x64_sys_clone+0x245/0x2b0 kernel/fork.c:2683
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f3579a82e99
RSP: 002b:00007f35783d7168 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f3579b96030 RCX: 00007f3579a82e99
RDX: 0000000020000740 RSI: 0000000020000700 RDI: 00000000a0020000
RBP: 00007f3579adcff1 R08: 00000000200007c0 R09: 0000000000000000
R10: 0000000020000780 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffda938d2df R14: 00007f35783d7300 R15: 0000000000022000
 </TASK>
INFO: task syz-executor.4:4405 blocked for more than 149 seconds.
      Not tainted 5.16.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4  state:D
 stack:22192 pid: 4405 ppid:  4381 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4972 [inline]
 __schedule+0xb72/0x1460 kernel/sched/core.c:6253
 schedule+0x12b/0x1f0 kernel/sched/core.c:6326
 rwsem_down_write_slowpath+0xdb7/0x1480 kernel/locking/rwsem.c:1151
 __down_write_common kernel/locking/rwsem.c:1268 [inline]
 __down_write kernel/locking/rwsem.c:1277 [inline]
 down_write+0x163/0x170 kernel/locking/rwsem.c:1524
 namespace_lock fs/namespace.c:1458 [inline]
 copy_mnt_ns+0x113/0xd30 fs/namespace.c:3423
 create_new_namespaces+0xd2/0xa00 kernel/nsproxy.c:78
 copy_namespaces+0x333/0x390 kernel/nsproxy.c:178
 copy_process+0x2968/0x5ca0 kernel/fork.c:2194
 kernel_clone+0x22a/0x7e0 kernel/fork.c:2582
 __do_sys_clone kernel/fork.c:2699 [inline]
 __se_sys_clone kernel/fork.c:2683 [inline]
 __x64_sys_clone+0x245/0x2b0 kernel/fork.c:2683
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f3579a82e99
RSP: 002b:00007f35783d7168 EFLAGS: 00000246
 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f3579b96030 RCX: 00007f3579a82e99
RDX: 0000000020000740 RSI: 0000000020000700 RDI: 00000000a0020000
RBP: 00007f3579adcff1 R08: 00000000200007c0 R09: 0000000000000000
R10: 0000000020000780 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffda938d2df R14: 00007f35783d7300 R15: 0000000000022000
 </TASK>
INFO: task syz-executor.4:4407 blocked for more than 150 seconds.
      Not tainted 5.16.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4  state:D stack:22192 pid: 4407 ppid:  4384 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4972 [inline]
 __schedule+0xb72/0x1460 kernel/sched/core.c:6253
 schedule+0x12b/0x1f0 kernel/sched/core.c:6326
 rwsem_down_write_slowpath+0xdb7/0x1480 kernel/locking/rwsem.c:1151
 __down_write_common kernel/locking/rwsem.c:1268 [inline]
 __down_write kernel/locking/rwsem.c:1277 [inline]
 down_write+0x163/0x170 kernel/locking/rwsem.c:1524
 namespace_lock fs/namespace.c:1458 [inline]
 copy_mnt_ns+0x113/0xd30 fs/namespace.c:3423
 create_new_namespaces+0xd2/0xa00 kernel/nsproxy.c:78
 copy_namespaces+0x333/0x390 kernel/nsproxy.c:178
 copy_process+0x2968/0x5ca0 kernel/fork.c:2194
 kernel_clone+0x22a/0x7e0 kernel/fork.c:2582
 __do_sys_clone kernel/fork.c:2699 [inline]
 __se_sys_clone kernel/fork.c:2683 [inline]
 __x64_sys_clone+0x245/0x2b0 kernel/fork.c:2683
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f3579a82e99
RSP: 002b:00007f35783d7168 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f3579b96030 RCX: 00007f3579a82e99
RDX: 0000000020000740 RSI: 0000000020000700 RDI: 00000000a0020000
RBP: 00007f3579adcff1 R08: 00000000200007c0 R09: 0000000000000000
R10: 0000000020000780 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffda938d2df R14: 00007f35783d7300 R15: 0000000000022000
 </TASK>
INFO: task syz-executor.4:4411 blocked for more than 150 seconds.
      Not tainted 5.16.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4  state:D stack:22320 pid: 4411 ppid:  4389 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4972 [inline]
 __schedule+0xb72/0x1460 kernel/sched/core.c:6253
 schedule+0x12b/0x1f0 kernel/sched/core.c:6326
 rwsem_down_write_slowpath+0xdb7/0x1480 kernel/locking/rwsem.c:1151
 __down_write_common kernel/locking/rwsem.c:1268 [inline]
 __down_write kernel/locking/rwsem.c:1277 [inline]
 down_write+0x163/0x170 kernel/locking/rwsem.c:1524
 namespace_lock fs/namespace.c:1458 [inline]
 copy_mnt_ns+0x113/0xd30 fs/namespace.c:3423
 create_new_namespaces+0xd2/0xa00 kernel/nsproxy.c:78
 copy_namespaces+0x333/0x390 kernel/nsproxy.c:178
 copy_process+0x2968/0x5ca0 kernel/fork.c:2194
 kernel_clone+0x22a/0x7e0 kernel/fork.c:2582
 __do_sys_clone kernel/fork.c:2699 [inline]
 __se_sys_clone kernel/fork.c:2683 [inline]
 __x64_sys_clone+0x245/0x2b0 kernel/fork.c:2683
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f3579a82e99
RSP: 002b:00007f35783d7168 EFLAGS: 00000246
 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f3579b96030 RCX: 00007f3579a82e99
RDX: 0000000020000740 RSI: 0000000020000700 RDI: 00000000a0020000
RBP: 00007f3579adcff1 R08: 00000000200007c0 R09: 0000000000000000
R10: 0000000020000780 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffda938d2df R14: 00007f35783d7300 R15: 0000000000022000
 </TASK>
INFO: task syz-executor.4:4413 blocked for more than 151 seconds.
      Not tainted 5.16.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4  state:D
 stack:22480 pid: 4413 ppid:  4381 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4972 [inline]
 __schedule+0xb72/0x1460 kernel/sched/core.c:6253
 schedule+0x12b/0x1f0 kernel/sched/core.c:6326
 rwsem_down_write_slowpath+0xdb7/0x1480 kernel/locking/rwsem.c:1151
 __down_write_common kernel/locking/rwsem.c:1268 [inline]
 __down_write kernel/locking/rwsem.c:1277 [inline]
 down_write+0x163/0x170 kernel/locking/rwsem.c:1524
 namespace_lock fs/namespace.c:1458 [inline]
 copy_mnt_ns+0x113/0xd30 fs/namespace.c:3423
 create_new_namespaces+0xd2/0xa00 kernel/nsproxy.c:78
 copy_namespaces+0x333/0x390 kernel/nsproxy.c:178
 copy_process+0x2968/0x5ca0 kernel/fork.c:2194
 kernel_clone+0x22a/0x7e0 kernel/fork.c:2582
 __do_sys_clone kernel/fork.c:2699 [inline]
 __se_sys_clone kernel/fork.c:2683 [inline]
 __x64_sys_clone+0x245/0x2b0 kernel/fork.c:2683
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f3579a82e99
RSP: 002b:00007f35783d7168 EFLAGS: 00000246
 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f3579b96030 RCX: 00007f3579a82e99
RDX: 0000000020000740 RSI: 0000000020000700 RDI: 00000000a0020000
RBP: 00007f3579adcff1 R08: 00000000200007c0 R09: 0000000000000000
R10: 0000000020000780 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffda938d2df R14: 00007f35783d7300 R15: 0000000000022000
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/27:
 #0: 
ffffffff8cb1de00
 (
rcu_read_lock
){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by getty/3295:
 #0: ffff888023e57098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
 #1: ffffc90002b962e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6c5/0x1c60 drivers/tty/n_tty.c:2113
4 locks held by syz-executor.4/11255:
2 locks held by kworker/0:23/11800:
 #0: ffff8880b9a395d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x25/0x110 kernel/sched/core.c:478
 #1: ffff8880b9a27888 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x4c1/0x780 kernel/sched/psi.c:880
1 lock held by syz-executor.4/4377:
 #0: ffffffff8cc1a5d0 (namespace_sem){++++}-{3:3}, at: namespace_lock fs/namespace.c:1458 [inline]
 #0: ffffffff8cc1a5d0 (namespace_sem){++++}-{3:3}, at: copy_mnt_ns+0x113/0xd30 fs/namespace.c:3423
1 lock held by syz-executor.4/4380:
 #0: ffffffff8cc1a5d0 (namespace_sem){++++}-{3:3}, at: namespace_lock fs/namespace.c:1458 [inline]
 #0: ffffffff8cc1a5d0 (namespace_sem){++++}-{3:3}, at: copy_mnt_ns+0x113/0xd30 fs/namespace.c:3423
1 lock held by syz-executor.4/4381:
 #0: ffffffff8cc1a5d0 (namespace_sem){++++}-{3:3}, at: namespace_lock fs/namespace.c:1458 [inline]
 #0: ffffffff8cc1a5d0 (namespace_sem){++++}-{3:3}, at: copy_mnt_ns+0x113/0xd30 fs/namespace.c:3423
1 lock held by syz-executor.4/4383:
 #0: ffffffff8cc1a5d0 (namespace_sem){++++}-{3:3}, at: namespace_lock fs/namespace.c:1458 [inline]
 #0: ffffffff8cc1a5d0 (namespace_sem){++++}-{3:3}, at: copy_mnt_ns+0x113/0xd30 fs/namespace.c:3423
1 lock held by syz-executor.4/4384:
 #0: ffffffff8cc1a5d0 (namespace_sem){++++}-{3:3}, at: namespace_lock fs/namespace.c:1458 [inline]
 #0: ffffffff8cc1a5d0 (namespace_sem){++++}-{3:3}, at: copy_mnt_ns+0x113/0xd30 fs/namespace.c:3423
1 lock held by syz-executor.4/4385:
 #0: ffffffff8cc1a5d0 (namespace_sem){++++}-{3:3}, at: namespace_lock fs/namespace.c:1458 [inline]
 #0: ffffffff8cc1a5d0 (namespace_sem){++++}-{3:3}, at: copy_mnt_ns+0x113/0xd30 fs/namespace.c:3423
1 lock held by syz-executor.4/4386:
 #0: 
ffffffff8cc1a5d0

Crashes (3):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-smack-root 2022/01/10 12:07 upstream df0cc57e057f 2ca0d385 .config log report info INFO: task hung in copy_mnt_ns
ci-upstream-kasan-gce-root 2022/01/02 04:36 upstream 278218f6778b e1768e9c .config log report info INFO: task hung in copy_mnt_ns
ci-upstream-kasan-gce-selinux-root 2021/12/30 19:50 upstream eec4df26e24e 2e49f10d .config log report info INFO: task hung in copy_mnt_ns
* Struck through repros no longer work on HEAD.