INFO: task syz.4.39:617 blocked for more than 122 seconds.
Not tainted 6.12.38-syzkaller-08825-gbf0fb8bb181b #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.39 state:D stack:0 pid:617 tgid:612 ppid:474 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5945 [inline]
__schedule+0x1322/0x1df0 kernel/sched/core.c:7791
__schedule_loop kernel/sched/core.c:7872 [inline]
schedule+0xc6/0x240 kernel/sched/core.c:7887
schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:7944
rwsem_down_write_slowpath+0x9e8/0x1b90 kernel/locking/rwsem.c:1239
__down_write_common kernel/locking/rwsem.c:1383 [inline]
__down_write kernel/locking/rwsem.c:1392 [inline]
down_write+0x152/0x2a0 kernel/locking/rwsem.c:1659
namespace_lock fs/namespace.c:1710 [inline]
dissolve_on_fput+0x2d/0x110 fs/namespace.c:2207
__fput+0x867/0xa00 fs/file_table.c:439
____fput+0x20/0x30 fs/file_table.c:457
task_work_run+0x1e0/0x250 kernel/task_work.c:240
exit_task_work include/linux/task_work.h:43 [inline]
do_exit+0x9bc/0x2630 kernel/exit.c:953
do_group_exit+0x22a/0x300 kernel/exit.c:1095
get_signal+0x139d/0x14f0 kernel/signal.c:2933
arch_do_signal_or_restart+0x96/0x720 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x58/0xb0 kernel/entry/common.c:218
do_syscall_64+0x64/0xf0 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f40e0d8e9a9
RSP: 002b:00007f40e07bd038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffe4 RBX: 00007f40e0fb6320 RCX: 00007f40e0d8e9a9
RDX: 0000000000000000 RSI: 0000200000000080 RDI: 0000200000000240
RBP: 00007f40e0e10d69 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000080700a R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f40e0fb6320 R15: 00007fff14c3fe58
INFO: task syz.1.40:623 blocked for more than 124 seconds.
Not tainted 6.12.38-syzkaller-08825-gbf0fb8bb181b #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.40 state:D stack:0 pid:623 tgid:618 ppid:471 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5945 [inline]
__schedule+0x1322/0x1df0 kernel/sched/core.c:7791
__schedule_loop kernel/sched/core.c:7872 [inline]
schedule+0xc6/0x240 kernel/sched/core.c:7887
schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:7944
rwsem_down_write_slowpath+0x9e8/0x1b90 kernel/locking/rwsem.c:1239
__down_write_common kernel/locking/rwsem.c:1383 [inline]
__down_write kernel/locking/rwsem.c:1392 [inline]
down_write+0x152/0x2a0 kernel/locking/rwsem.c:1659
namespace_lock fs/namespace.c:1710 [inline]
dissolve_on_fput+0x2d/0x110 fs/namespace.c:2207
__fput+0x867/0xa00 fs/file_table.c:439
____fput+0x20/0x30 fs/file_table.c:457
task_work_run+0x1e0/0x250 kernel/task_work.c:240
exit_task_work include/linux/task_work.h:43 [inline]
do_exit+0x9bc/0x2630 kernel/exit.c:953
do_group_exit+0x22a/0x300 kernel/exit.c:1095
get_signal+0x139d/0x14f0 kernel/signal.c:2933
arch_do_signal_or_restart+0x96/0x720 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x58/0xb0 kernel/entry/common.c:218
do_syscall_64+0x64/0xf0 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7febb058e9a9
RSP: 002b:00007febaff9c038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: 0000000000000000 RBX: 00007febb07b6320 RCX: 00007febb058e9a9
RDX: 0000000000000000 RSI: 0000200000000080 RDI: 0000200000000240
RBP: 00007febb0610d69 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000080700a R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007febb07b6320 R15: 00007ffc96520af8
INFO: task syz.5.42:631 blocked for more than 125 seconds.
Not tainted 6.12.38-syzkaller-08825-gbf0fb8bb181b #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.42 state:D stack:0 pid:631 tgid:630 ppid:470 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5945 [inline]
__schedule+0x1322/0x1df0 kernel/sched/core.c:7791
__schedule_loop kernel/sched/core.c:7872 [inline]
schedule+0xc6/0x240 kernel/sched/core.c:7887
schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:7944
rwsem_down_write_slowpath+0x9e8/0x1b90 kernel/locking/rwsem.c:1239
__down_write_common kernel/locking/rwsem.c:1383 [inline]
__down_write kernel/locking/rwsem.c:1392 [inline]
down_write+0x152/0x2a0 kernel/locking/rwsem.c:1659
namespace_lock fs/namespace.c:1710 [inline]
do_lock_mount+0x20d/0x520 fs/namespace.c:2614
lock_mount fs/namespace.c:2658 [inline]
do_loopback+0x256/0x4b0 fs/namespace.c:2782
path_mount+0x582/0x1050 fs/namespace.c:3847
do_mount fs/namespace.c:3866 [inline]
__do_sys_mount fs/namespace.c:4076 [inline]
__se_sys_mount+0x2bd/0x480 fs/namespace.c:4053
__x64_sys_mount+0xc3/0xf0 fs/namespace.c:4053
x64_sys_call+0x2021/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:166
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f5d1498e9a9
RSP: 002b:00007f5d15799038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f5d14bb5fa0 RCX: 00007f5d1498e9a9
RDX: 0000000000000000 RSI: 0000200000000300 RDI: 0000200000000380
RBP: 00007f5d14a10d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000002125099 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f5d14bb5fa0 R15: 00007fff14556fc8
INFO: task syz.5.42:632 blocked for more than 126 seconds.
Not tainted 6.12.38-syzkaller-08825-gbf0fb8bb181b #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.42 state:D stack:0 pid:632 tgid:630 ppid:470 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5945 [inline]
__schedule+0x1322/0x1df0 kernel/sched/core.c:7791
__schedule_loop kernel/sched/core.c:7872 [inline]
schedule+0xc6/0x240 kernel/sched/core.c:7887
schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:7944
rwsem_down_write_slowpath+0x9e8/0x1b90 kernel/locking/rwsem.c:1239
__down_write_common kernel/locking/rwsem.c:1383 [inline]
__down_write kernel/locking/rwsem.c:1392 [inline]
down_write+0x152/0x2a0 kernel/locking/rwsem.c:1659
namespace_lock fs/namespace.c:1710 [inline]
do_change_type+0x11f/0x5a0 fs/namespace.c:2717
path_mount+0x43b/0x1050 fs/namespace.c:3849
do_mount fs/namespace.c:3866 [inline]
__do_sys_mount fs/namespace.c:4076 [inline]
__se_sys_mount+0x2bd/0x480 fs/namespace.c:4053
__x64_sys_mount+0xc3/0xf0 fs/namespace.c:4053
x64_sys_call+0x2021/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:166
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f5d1498e9a9
RSP: 002b:00007f5d15778038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f5d14bb6080 RCX: 00007f5d1498e9a9
RDX: 0000000000000000 RSI: 00002000000005c0 RDI: 0000000000000000
RBP: 00007f5d14a10d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000100000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f5d14bb6080 R15: 00007fff14556fc8
INFO: task syz.5.42:633 blocked for more than 127 seconds.
Not tainted 6.12.38-syzkaller-08825-gbf0fb8bb181b #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.42 state:D stack:0 pid:633 tgid:630 ppid:470 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5945 [inline]
__schedule+0x1322/0x1df0 kernel/sched/core.c:7791
__schedule_loop kernel/sched/core.c:7872 [inline]
schedule+0xc6/0x240 kernel/sched/core.c:7887
schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:7944
rwsem_down_write_slowpath+0x9e8/0x1b90 kernel/locking/rwsem.c:1239
__down_write_common kernel/locking/rwsem.c:1383 [inline]
__down_write kernel/locking/rwsem.c:1392 [inline]
down_write+0x152/0x2a0 kernel/locking/rwsem.c:1659
namespace_lock fs/namespace.c:1710 [inline]
open_detached_copy fs/namespace.c:2821 [inline]
__do_sys_open_tree fs/namespace.c:2887 [inline]
__se_sys_open_tree+0x34a/0x8e0 fs/namespace.c:2849
__x64_sys_open_tree+0x7f/0xa0 fs/namespace.c:2849
x64_sys_call+0x2d58/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:429
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f5d1498e9a9
RSP: 002b:00007f5d15757038 EFLAGS: 00000246 ORIG_RAX: 00000000000001ac
RAX: ffffffffffffffda RBX: 00007f5d14bb6160 RCX: 00007f5d1498e9a9
RDX: 0000000000089901 RSI: 0000200000000640 RDI: ffffffffffffff9c
RBP: 00007f5d14a10d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f5d14bb6160 R15: 00007fff14556fc8
INFO: task syz.5.42:634 blocked for more than 128 seconds.
Not tainted 6.12.38-syzkaller-08825-gbf0fb8bb181b #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.42 state:D stack:0 pid:634 tgid:630 ppid:470 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5945 [inline]
__schedule+0x1322/0x1df0 kernel/sched/core.c:7791
__schedule_loop kernel/sched/core.c:7872 [inline]
schedule+0xc6/0x240 kernel/sched/core.c:7887
schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:7944
rwsem_down_write_slowpath+0x9e8/0x1b90 kernel/locking/rwsem.c:1239
__down_write_common kernel/locking/rwsem.c:1383 [inline]
__down_write kernel/locking/rwsem.c:1392 [inline]
down_write+0x152/0x2a0 kernel/locking/rwsem.c:1659
namespace_lock fs/namespace.c:1710 [inline]
do_lock_mount+0x20d/0x520 fs/namespace.c:2614
lock_mount fs/namespace.c:2658 [inline]
do_loopback+0x256/0x4b0 fs/namespace.c:2782
path_mount+0x582/0x1050 fs/namespace.c:3847
do_mount fs/namespace.c:3866 [inline]
__do_sys_mount fs/namespace.c:4076 [inline]
__se_sys_mount+0x2bd/0x480 fs/namespace.c:4053
__x64_sys_mount+0xc3/0xf0 fs/namespace.c:4053
x64_sys_call+0x2021/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:166
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f5d1498e9a9
RSP: 002b:00007f5d15736038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f5d14bb6240 RCX: 00007f5d1498e9a9
RDX: 0000000000000000 RSI: 0000200000000340 RDI: 0000200000000000
RBP: 00007f5d14a10d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000891018 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f5d14bb6240 R15: 00007fff14556fc8
INFO: task syz.5.42:635 blocked for more than 129 seconds.
Not tainted 6.12.38-syzkaller-08825-gbf0fb8bb181b #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.42 state:D stack:0 pid:635 tgid:630 ppid:470 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5945 [inline]
__schedule+0x1322/0x1df0 kernel/sched/core.c:7791
__schedule_loop kernel/sched/core.c:7872 [inline]
schedule+0xc6/0x240 kernel/sched/core.c:7887
schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:7944
rwsem_down_read_slowpath+0x6d1/0x1460 kernel/locking/rwsem.c:1136
__down_read_common kernel/locking/rwsem.c:1317 [inline]
__down_read kernel/locking/rwsem.c:1330 [inline]
down_read+0x8f/0xe0 kernel/locking/rwsem.c:1607
inode_lock_shared include/linux/fs.h:825 [inline]
lookup_slow+0x4a/0x80 fs/namei.c:1748
walk_component+0x302/0x440 fs/namei.c:2053
lookup_last fs/namei.c:2556 [inline]
path_lookupat+0x180/0x4a0 fs/namei.c:2580
filename_lookup+0x428/0x520 fs/namei.c:2611
user_path_at+0x42/0x60 fs/namei.c:3016
do_mount fs/namespace.c:3863 [inline]
__do_sys_mount fs/namespace.c:4076 [inline]
__se_sys_mount+0x288/0x480 fs/namespace.c:4053
__x64_sys_mount+0xc3/0xf0 fs/namespace.c:4053
x64_sys_call+0x2021/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:166
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f5d1498e9a9
RSP: 002b:00007f5d15715038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f5d14bb6320 RCX: 00007f5d1498e9a9
RDX: 0000000000000000 RSI: 0000200000000080 RDI: 0000200000000240
RBP: 00007f5d14a10d69 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000080700a R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f5d14bb6320 R15: 00007fff14556fc8
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted 6.12.38-syzkaller-08825-gbf0fb8bb181b #0 29a1efc1b54a433eae1c5b13a78989f6fc2bc155
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
__dump_stack+0x21/0x30 lib/dump_stack.c:94
dump_stack_lvl+0x10c/0x190 lib/dump_stack.c:120
dump_stack+0x19/0x20 lib/dump_stack.c:129
nmi_cpu_backtrace+0x2bf/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:267 [inline]
watchdog+0xd8f/0xed0 kernel/hung_task.c:423
kthread+0x2ca/0x370 kernel/kthread.c:389
ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 629 Comm: syz.3.41 Not tainted 6.12.38-syzkaller-08825-gbf0fb8bb181b #0 29a1efc1b54a433eae1c5b13a78989f6fc2bc155
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:do_make_slave fs/pnode.c:101 [inline]
RIP: 0010:change_mnt_propagation+0xff/0xb00 fs/pnode.c:128
Code: 4b e7 ff 4d 8b 2e 48 c7 c3 28 ff ff ff 4d 89 fc 4d 8d 74 24 20 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 <74> 08 4c 89 f7 e8 77 4b e7 ff 4d 39 2e 0f 84 8f 00 00 00 49 81 c4
RSP: 0018:ffffc90000f5f9c0 EFLAGS: 00000246
RAX: 1ffff110250e451c RBX: ffffffffffffff28 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000040000 RDI: 0000000000100000
RBP: ffffc90000f5fa10 R08: ffff88813e4c482f R09: 0000000000000000
R10: ffff88813e4c4820 R11: ffffed1027c98906 R12: ffff8881287228c0
R13: ffff888129602000 R14: ffff8881287228e0 R15: ffff888128522700
FS: 00007f57ac3ff6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055555f4d64a8 CR3: 0000000121260000 CR4: 00000000003526b0
Call Trace:
umount_tree+0xdfd/0xf70 fs/namespace.c:1803
attach_recursive_mnt+0x6df/0x21e0 fs/namespace.c:2544
graft_tree+0x157/0x1c0 fs/namespace.c:2679
do_loopback+0x364/0x4b0 fs/namespace.c:2798
path_mount+0x582/0x1050 fs/namespace.c:3847
do_mount fs/namespace.c:3866 [inline]
__do_sys_mount fs/namespace.c:4076 [inline]
__se_sys_mount+0x2bd/0x480 fs/namespace.c:4053
__x64_sys_mount+0xc3/0xf0 fs/namespace.c:4053
x64_sys_call+0x2021/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:166
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f57ac98e9a9
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:00007f57ac3ff038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f57acbb6320 RCX: 00007f57ac98e9a9
RDX: 0000000000000000 RSI: 0000200000000080 RDI: 0000200000000240
RBP: 00007f57aca10d69 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000080700a R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f57acbb6320 R15: 00007ffe45254a18