INFO: task syz-executor:479 blocked for more than 122 seconds.
      Not tainted 6.16.0-rc6-syzkaller-00281-gf4a40a4282f4 #0
      Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:0     pid:479   tgid:479   ppid:1      task_flags:0x40054c flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5397 [inline]
 __schedule+0xfd2/0x1c60 kernel/sched/core.c:6786
 __schedule_loop kernel/sched/core.c:6864 [inline]
 schedule+0xe0/0x280 kernel/sched/core.c:6879
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:6936
 rwsem_down_write_slowpath+0xa63/0x1090 kernel/locking/rwsem.c:1176
 __down_write_common kernel/locking/rwsem.c:1304 [inline]
 __down_write kernel/locking/rwsem.c:1313 [inline]
 down_write+0x117/0x130 kernel/locking/rwsem.c:1578
 namespace_lock fs/namespace.c:1812 [inline]
 put_mnt_ns+0x56/0xf0 fs/namespace.c:6278
 free_nsproxy+0x43/0x240 kernel/nsproxy.c:188
 put_nsproxy include/linux/nsproxy.h:118 [inline]
 switch_task_namespaces kernel/nsproxy.c:241 [inline]
 exit_task_namespaces+0x99/0xe0 kernel/nsproxy.c:246
 do_exit+0x7cd/0x2160 kernel/exit.c:963
 do_group_exit+0x215/0x2e0 kernel/exit.c:1105
 get_signal+0x12d8/0x1420 kernel/signal.c:3034
 arch_do_signal_or_restart+0x9a/0x6f0 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0x81/0xd0 kernel/entry/common.c:111
 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]
 do_syscall_64+0x134/0x160 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f9c20384bd3
RSP: 002b:00007ffcdd6dc318 EFLAGS: 00000202 ORIG_RAX: 000000000000003d
RAX: fffffffffffffe00 RBX: 000000000000001f RCX: 00007f9c20384bd3
RDX: 0000000040000000 RSI: 00007ffcdd6dc35c RDI: 00000000ffffffff
RBP: 00007ffcdd6dc35c R08: 0000000015229b20 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000006
R13: 000055558c764470 R14: 0000000000011de9 R15: 00007ffcdd6dc3b0
 </TASK>
INFO: task syz.0.48:667 blocked for more than 124 seconds.
      Not tainted 6.16.0-rc6-syzkaller-00281-gf4a40a4282f4 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.48        state:D stack:0     pid:667   tgid:663   ppid:475    task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5397 [inline]
 __schedule+0xfd2/0x1c60 kernel/sched/core.c:6786
 __schedule_loop kernel/sched/core.c:6864 [inline]
 schedule+0xe0/0x280 kernel/sched/core.c:6879
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:6936
 rwsem_down_write_slowpath+0xa63/0x1090 kernel/locking/rwsem.c:1176
 __down_write_common kernel/locking/rwsem.c:1304 [inline]
 __down_write kernel/locking/rwsem.c:1313 [inline]
 down_write+0x117/0x130 kernel/locking/rwsem.c:1578
 namespace_lock fs/namespace.c:1812 [inline]
 do_lock_mount+0x20c/0x520 fs/namespace.c:2860
 lock_mount fs/namespace.c:2904 [inline]
 do_loopback+0x25d/0x4c0 fs/namespace.c:3093
 path_mount+0x582/0x1050 fs/namespace.c:4220
 do_mount fs/namespace.c:4239 [inline]
 __do_sys_mount fs/namespace.c:4450 [inline]
 __se_sys_mount+0x340/0x490 fs/namespace.c:4427
 __x64_sys_mount+0xc3/0xf0 fs/namespace.c:4427
 x64_sys_call+0xd52/0x2f80 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x62/0x160 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fb548d8e9a9
RSP: 002b:00007fb549b67038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fb548fb6240 RCX: 00007fb548d8e9a9
RDX: 0000000000000000 RSI: 0000200000000340 RDI: 0000200000000000
RBP: 00007fb548e10d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000891018 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fb548fb6240 R15: 00007fffcbdf69e8
 </TASK>
INFO: task syz.5.49:671 blocked for more than 124 seconds.
      Not tainted 6.16.0-rc6-syzkaller-00281-gf4a40a4282f4 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.49        state:D stack:0     pid:671   tgid:669   ppid:478    task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5397 [inline]
 __schedule+0xfd2/0x1c60 kernel/sched/core.c:6786
 __schedule_loop kernel/sched/core.c:6864 [inline]
 schedule+0xe0/0x280 kernel/sched/core.c:6879
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:6936
 rwsem_down_write_slowpath+0xa63/0x1090 kernel/locking/rwsem.c:1176
 __down_write_common kernel/locking/rwsem.c:1304 [inline]
 __down_write kernel/locking/rwsem.c:1313 [inline]
 down_write+0x117/0x130 kernel/locking/rwsem.c:1578
 namespace_lock fs/namespace.c:1812 [inline]
 do_change_type+0x11f/0x580 fs/namespace.c:2963
 path_mount+0x43b/0x1050 fs/namespace.c:4222
 do_mount fs/namespace.c:4239 [inline]
 __do_sys_mount fs/namespace.c:4450 [inline]
 __se_sys_mount+0x340/0x490 fs/namespace.c:4427
 __x64_sys_mount+0xc3/0xf0 fs/namespace.c:4427
 x64_sys_call+0xd52/0x2f80 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x62/0x160 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f56e418e9a9
RSP: 002b:00007f56e4f35038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f56e43b6080 RCX: 00007f56e418e9a9
RDX: 0000000000000000 RSI: 00002000000005c0 RDI: 0000000000000000
RBP: 00007f56e4210d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000100000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f56e43b6080 R15: 00007fff2918ca88
 </TASK>
INFO: task syz.5.49:672 blocked for more than 125 seconds.
      Not tainted 6.16.0-rc6-syzkaller-00281-gf4a40a4282f4 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.49        state:D stack:0     pid:672   tgid:669   ppid:478    task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5397 [inline]
 __schedule+0xfd2/0x1c60 kernel/sched/core.c:6786
 __schedule_loop kernel/sched/core.c:6864 [inline]
 schedule+0xe0/0x280 kernel/sched/core.c:6879
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:6936
 rwsem_down_write_slowpath+0xa63/0x1090 kernel/locking/rwsem.c:1176
 __down_write_common kernel/locking/rwsem.c:1304 [inline]
 __down_write kernel/locking/rwsem.c:1313 [inline]
 down_write+0x117/0x130 kernel/locking/rwsem.c:1578
 namespace_lock fs/namespace.c:1812 [inline]
 open_detached_copy fs/namespace.c:3133 [inline]
 vfs_open_tree+0x347/0x790 fs/namespace.c:3207
 __do_sys_open_tree fs/namespace.c:3217 [inline]
 __se_sys_open_tree fs/namespace.c:3212 [inline]
 __x64_sys_open_tree+0x82/0x100 fs/namespace.c:3212
 x64_sys_call+0x2826/0x2f80 arch/x86/include/generated/asm/syscalls_64.h:429
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x62/0x160 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f56e418e9a9
RSP: 002b:00007f56e4f14038 EFLAGS: 00000246 ORIG_RAX: 00000000000001ac
RAX: ffffffffffffffda RBX: 00007f56e43b6160 RCX: 00007f56e418e9a9
RDX: 0000000000089901 RSI: 0000200000000640 RDI: ffffffffffffff9c
RBP: 00007f56e4210d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f56e43b6160 R15: 00007fff2918ca88
 </TASK>
INFO: task syz.5.49:673 blocked for more than 125 seconds.
      Not tainted 6.16.0-rc6-syzkaller-00281-gf4a40a4282f4 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.49        state:D stack:0     pid:673   tgid:669   ppid:478    task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5397 [inline]
 __schedule+0xfd2/0x1c60 kernel/sched/core.c:6786
 __schedule_loop kernel/sched/core.c:6864 [inline]
 schedule+0xe0/0x280 kernel/sched/core.c:6879
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:6936
 rwsem_down_write_slowpath+0xa63/0x1090 kernel/locking/rwsem.c:1176
 __down_write_common kernel/locking/rwsem.c:1304 [inline]
 __down_write kernel/locking/rwsem.c:1313 [inline]
 down_write+0x117/0x130 kernel/locking/rwsem.c:1578
 namespace_lock fs/namespace.c:1812 [inline]
 do_lock_mount+0x20c/0x520 fs/namespace.c:2860
 lock_mount fs/namespace.c:2904 [inline]
 do_loopback+0x25d/0x4c0 fs/namespace.c:3093
 path_mount+0x582/0x1050 fs/namespace.c:4220
 do_mount fs/namespace.c:4239 [inline]
 __do_sys_mount fs/namespace.c:4450 [inline]
 __se_sys_mount+0x340/0x490 fs/namespace.c:4427
 __x64_sys_mount+0xc3/0xf0 fs/namespace.c:4427
 x64_sys_call+0xd52/0x2f80 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x62/0x160 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f56e418e9a9
RSP: 002b:00007f56e3bff038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f56e43b6240 RCX: 00007f56e418e9a9
RDX: 0000000000000000 RSI: 0000200000000340 RDI: 0000200000000000
RBP: 00007f56e4210d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000891018 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f56e43b6240 R15: 00007fff2918ca88
 </TASK>
INFO: task syz.5.49:674 blocked for more than 125 seconds.
      Not tainted 6.16.0-rc6-syzkaller-00281-gf4a40a4282f4 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.49        state:D stack:0     pid:674   tgid:669   ppid:478    task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5397 [inline]
 __schedule+0xfd2/0x1c60 kernel/sched/core.c:6786
 __schedule_loop kernel/sched/core.c:6864 [inline]
 schedule+0xe0/0x280 kernel/sched/core.c:6879
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:6936
 rwsem_down_read_slowpath+0x528/0xb10 kernel/locking/rwsem.c:1084
 __down_read_common kernel/locking/rwsem.c:1248 [inline]
 __down_read kernel/locking/rwsem.c:1261 [inline]
 down_read+0x56/0x100 kernel/locking/rwsem.c:1526
 inode_lock_shared include/linux/fs.h:884 [inline]
 lookup_slow+0x4a/0x80 fs/namei.c:1833
 walk_component+0x30b/0x450 fs/namei.c:2138
 lookup_last fs/namei.c:2639 [inline]
 path_lookupat+0x17a/0x490 fs/namei.c:2663
 filename_lookup+0x48d/0x580 fs/namei.c:2694
 user_path_at+0x42/0x60 fs/namei.c:3136
 do_mount fs/namespace.c:4236 [inline]
 __do_sys_mount fs/namespace.c:4450 [inline]
 __se_sys_mount+0x309/0x490 fs/namespace.c:4427
 __x64_sys_mount+0xc3/0xf0 fs/namespace.c:4427
 x64_sys_call+0xd52/0x2f80 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x62/0x160 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f56e418e9a9
RSP: 002b:00007f56e3bde038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f56e43b6320 RCX: 00007f56e418e9a9
RDX: 0000000000000000 RSI: 0000200000000080 RDI: 0000200000000240
RBP: 00007f56e4210d69 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000080700a R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f56e43b6320 R15: 00007fff2918ca88
 </TASK>
INFO: task syz.4.50:676 blocked for more than 125 seconds.
      Not tainted 6.16.0-rc6-syzkaller-00281-gf4a40a4282f4 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.50        state:D stack:0     pid:676   tgid:675   ppid:477    task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5397 [inline]
 __schedule+0xfd2/0x1c60 kernel/sched/core.c:6786
 __schedule_loop kernel/sched/core.c:6864 [inline]
 schedule+0xe0/0x280 kernel/sched/core.c:6879
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:6936
 rwsem_down_write_slowpath+0xa63/0x1090 kernel/locking/rwsem.c:1176
 __down_write_common kernel/locking/rwsem.c:1304 [inline]
 __down_write kernel/locking/rwsem.c:1313 [inline]
 down_write+0x117/0x130 kernel/locking/rwsem.c:1578
 namespace_lock fs/namespace.c:1812 [inline]
 do_lock_mount+0x20c/0x520 fs/namespace.c:2860
 lock_mount fs/namespace.c:2904 [inline]
 do_loopback+0x25d/0x4c0 fs/namespace.c:3093
 path_mount+0x582/0x1050 fs/namespace.c:4220
 do_mount fs/namespace.c:4239 [inline]
 __do_sys_mount fs/namespace.c:4450 [inline]
 __se_sys_mount+0x340/0x490 fs/namespace.c:4427
 __x64_sys_mount+0xc3/0xf0 fs/namespace.c:4427
 x64_sys_call+0xd52/0x2f80 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x62/0x160 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fe17e38e9a9
RSP: 002b:00007fe17f2a8038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fe17e5b5fa0 RCX: 00007fe17e38e9a9
RDX: 0000000000000000 RSI: 0000200000000300 RDI: 0000200000000380
RBP: 00007fe17e410d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000002125099 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fe17e5b5fa0 R15: 00007ffe198e3128
 </TASK>
INFO: task syz.4.50:677 blocked for more than 126 seconds.
      Not tainted 6.16.0-rc6-syzkaller-00281-gf4a40a4282f4 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.50        state:D stack:0     pid:677   tgid:675   ppid:477    task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5397 [inline]
 __schedule+0xfd2/0x1c60 kernel/sched/core.c:6786
 __schedule_loop kernel/sched/core.c:6864 [inline]
 schedule+0xe0/0x280 kernel/sched/core.c:6879
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:6936
 rwsem_down_write_slowpath+0xa63/0x1090 kernel/locking/rwsem.c:1176
 __down_write_common kernel/locking/rwsem.c:1304 [inline]
 __down_write kernel/locking/rwsem.c:1313 [inline]
 down_write+0x117/0x130 kernel/locking/rwsem.c:1578
 namespace_lock fs/namespace.c:1812 [inline]
 do_change_type+0x11f/0x580 fs/namespace.c:2963
 path_mount+0x43b/0x1050 fs/namespace.c:4222
 do_mount fs/namespace.c:4239 [inline]
 __do_sys_mount fs/namespace.c:4450 [inline]
 __se_sys_mount+0x340/0x490 fs/namespace.c:4427
 __x64_sys_mount+0xc3/0xf0 fs/namespace.c:4427
 x64_sys_call+0xd52/0x2f80 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x62/0x160 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fe17e38e9a9
RSP: 002b:00007fe17f287038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fe17e5b6080 RCX: 00007fe17e38e9a9
RDX: 0000000000000000 RSI: 00002000000005c0 RDI: 0000000000000000
RBP: 00007fe17e410d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000100000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fe17e5b6080 R15: 00007ffe198e3128
 </TASK>
INFO: task syz.4.50:678 blocked for more than 126 seconds.
      Not tainted 6.16.0-rc6-syzkaller-00281-gf4a40a4282f4 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.50        state:D stack:0     pid:678   tgid:675   ppid:477    task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5397 [inline]
 __schedule+0xfd2/0x1c60 kernel/sched/core.c:6786
 __schedule_loop kernel/sched/core.c:6864 [inline]
 schedule+0xe0/0x280 kernel/sched/core.c:6879
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:6936
 rwsem_down_write_slowpath+0xa63/0x1090 kernel/locking/rwsem.c:1176
 __down_write_common kernel/locking/rwsem.c:1304 [inline]
 __down_write kernel/locking/rwsem.c:1313 [inline]
 down_write+0x117/0x130 kernel/locking/rwsem.c:1578
 namespace_lock fs/namespace.c:1812 [inline]
 open_detached_copy fs/namespace.c:3133 [inline]
 vfs_open_tree+0x347/0x790 fs/namespace.c:3207
 __do_sys_open_tree fs/namespace.c:3217 [inline]
 __se_sys_open_tree fs/namespace.c:3212 [inline]
 __x64_sys_open_tree+0x82/0x100 fs/namespace.c:3212
 x64_sys_call+0x2826/0x2f80 arch/x86/include/generated/asm/syscalls_64.h:429
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x62/0x160 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fe17e38e9a9
RSP: 002b:00007fe17f266038 EFLAGS: 00000246 ORIG_RAX: 00000000000001ac
RAX: ffffffffffffffda RBX: 00007fe17e5b6160 RCX: 00007fe17e38e9a9
RDX: 0000000000089901 RSI: 0000200000000640 RDI: ffffffffffffff9c
RBP: 00007fe17e410d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fe17e5b6160 R15: 00007ffe198e3128
 </TASK>
INFO: task syz.4.50:679 blocked for more than 126 seconds.
      Not tainted 6.16.0-rc6-syzkaller-00281-gf4a40a4282f4 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.50        state:D stack:0     pid:679   tgid:675   ppid:477    task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5397 [inline]
 __schedule+0xfd2/0x1c60 kernel/sched/core.c:6786
 __schedule_loop kernel/sched/core.c:6864 [inline]
 schedule+0xe0/0x280 kernel/sched/core.c:6879
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:6936
 rwsem_down_read_slowpath+0x528/0xb10 kernel/locking/rwsem.c:1084
 __down_read_common kernel/locking/rwsem.c:1248 [inline]
 __down_read kernel/locking/rwsem.c:1261 [inline]
 down_read+0x56/0x100 kernel/locking/rwsem.c:1526
 inode_lock_shared include/linux/fs.h:884 [inline]
 lookup_slow+0x4a/0x80 fs/namei.c:1833
 walk_component+0x30b/0x450 fs/namei.c:2138
 lookup_last fs/namei.c:2639 [inline]
 path_lookupat+0x17a/0x490 fs/namei.c:2663
 filename_lookup+0x48d/0x580 fs/namei.c:2694
 user_path_at+0x42/0x60 fs/namei.c:3136
 do_mount fs/namespace.c:4236 [inline]
 __do_sys_mount fs/namespace.c:4450 [inline]
 __se_sys_mount+0x309/0x490 fs/namespace.c:4427
 __x64_sys_mount+0xc3/0xf0 fs/namespace.c:4427
 x64_sys_call+0xd52/0x2f80 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x62/0x160 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fe17e38e9a9
RSP: 002b:00007fe17f245038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fe17e5b6240 RCX: 00007fe17e38e9a9
RDX: 0000000000000000 RSI: 0000200000000080 RDI: 0000200000000240
RBP: 00007fe17e410d69 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000080700a R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fe17e5b6240 R15: 00007ffe198e3128
 </TASK>
Future hung task reports are suppressed, see sysctl kernel.hung_task_warnings
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted 6.16.0-rc6-syzkaller-00281-gf4a40a4282f4 #0 PREEMPT  a897bbc0dff1d75e89b450a6bfc861ec087d8b05
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:94
 dump_stack_lvl+0x10b/0x180 lib/dump_stack.c:120
 dump_stack+0x19/0x20 lib/dump_stack.c:129
 nmi_cpu_backtrace+0x2bd/0x2d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41
 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:307 [inline]
 watchdog+0xc40/0xc90 kernel/hung_task.c:470
 kthread+0x6f7/0x880 kernel/kthread.c:464
 ret_from_fork+0x14a/0x1f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 672 Comm: syz.5.49 Not tainted 6.16.0-rc6-syzkaller-00281-gf4a40a4282f4 #0 PREEMPT  a897bbc0dff1d75e89b450a6bfc861ec087d8b05
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:pcpu_next_md_free_region mm/percpu.c:373 [inline]
RIP: 0010:pcpu_chunk_refresh_hint+0x375/0x940 mm/percpu.c:762
Code: 8b 45 90 44 29 e8 48 89 45 c8 45 31 ff 48 8b 5d c0 41 83 ee 01 0f 82 a6 00 00 00 e8 85 2b bc ff 48 83 45 98 20 48 83 45 d0 20 <48> 83 45 a0 20 48 83 45 88 20 49 83 c4 20 81 45 a8 00 fc ff ff 81
RSP: 0018:ffffc90002b6f980 EFLAGS: 00000086
RAX: ffffffff81e8942b RBX: ffff888114f31c78 RCX: ffff888120e3c500
RDX: 0000000000000000 RSI: 0000000000000400 RDI: 0000000000000400
RBP: ffffc90002b6fa18 R08: ffffc9000272d64f R09: 1ffff920004e5ac9
R10: dffffc0000000000 R11: fffff520004e5aca R12: ffffc9000079c1f0
R13: 0000000000003d84 R14: 0000000000000083 R15: 0000000000000000
FS:  00007f56e4f146c0(0000) GS:ffff88826e783000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe718e8388 CR3: 000000013ff38000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 pcpu_block_update_hint_alloc+0x8a4/0xc50 mm/percpu.c:942
 pcpu_alloc_area+0x5fe/0x720 mm/percpu.c:1258
 pcpu_alloc_noprof+0x540/0x1420 mm/percpu.c:1821
 alloc_vfsmnt+0x185/0x610 fs/namespace.c:367
 clone_mnt+0x75/0xc80 fs/namespace.c:1336
 copy_tree+0x403/0xc30 fs/namespace.c:2293
 __do_loopback+0x1de/0x4d0 fs/namespace.c:3063
 open_detached_copy fs/namespace.c:3148 [inline]
 vfs_open_tree+0x40e/0x790 fs/namespace.c:3207
 __do_sys_open_tree fs/namespace.c:3217 [inline]
 __se_sys_open_tree fs/namespace.c:3212 [inline]
 __x64_sys_open_tree+0x82/0x100 fs/namespace.c:3212
 x64_sys_call+0x2826/0x2f80 arch/x86/include/generated/asm/syscalls_64.h:429
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x62/0x160 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f56e418e9a9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f56e4f14038 EFLAGS: 00000246 ORIG_RAX: 00000000000001ac
RAX: ffffffffffffffda RBX: 00007f56e43b6160 RCX: 00007f56e418e9a9
RDX: 0000000000089901 RSI: 0000200000000640 RDI: ffffffffffffff9c
RBP: 00007f56e4210d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f56e43b6160 R15: 00007fff2918ca88
 </TASK>