INFO: task syz.2.16:482 blocked for more than 122 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.16        state:D stack:0     pid:482   tgid:480   ppid:470    flags:0x00000004
Call Trace:
 <TASK>
 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:827 [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+0x1f5/0x520 fs/namei.c:2609
 user_path_at+0x42/0x60 fs/namei.c:3016
 do_mount fs/namespace.c:3874 [inline]
 __do_sys_mount fs/namespace.c:4087 [inline]
 __se_sys_mount+0x288/0x480 fs/namespace.c:4064
 __x64_sys_mount+0xc3/0xf0 fs/namespace.c:4064
 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: 0033:0x7f2f2e18e929
RSP: 002b:00007f2f2ef30038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f2f2e3b6080 RCX: 00007f2f2e18e929
RDX: 0000000000000000 RSI: 0000200000000040 RDI: 0000000000000000
RBP: 00007f2f2e210b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000200000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f2f2e3b6080 R15: 00007fffda43c698
 </TASK>
INFO: task syz.3.17:499 blocked for more than 123 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.17        state:D stack:0     pid:499   tgid:495   ppid:485    flags:0x00000004
Call Trace:
 <TASK>
 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:827 [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+0x1f5/0x520 fs/namei.c:2609
 user_path_at+0x42/0x60 fs/namei.c:3016
 do_mount fs/namespace.c:3874 [inline]
 __do_sys_mount fs/namespace.c:4087 [inline]
 __se_sys_mount+0x288/0x480 fs/namespace.c:4064
 __x64_sys_mount+0xc3/0xf0 fs/namespace.c:4064
 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: 0033:0x7f894b58e929
RSP: 002b:00007f894c408038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f894b7b6080 RCX: 00007f894b58e929
RDX: 0000000000000000 RSI: 0000200000000040 RDI: 0000000000000000
RBP: 00007f894b610b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000200000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f894b7b6080 R15: 00007fffe7cb9458
 </TASK>
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 f399e2531b38217630edc10267b2055d6aefb68d
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 __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
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 f399e2531b38217630edc10267b2055d6aefb68d
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:_find_first_bit+0x1c/0xb0 lib/find_bit.c:-1
Code: 76 15 88 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 85 f6 74 42 48 89 f3 49 89 fe <49> bc 00 00 00 00 00 fc ff df 48 89 f8 48 c1 e8 03 42 80 3c 20 00
RSP: 0018:ffffc90000007dc8 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff88975cc0
RBP: ffffc90000007df0 R08: ffff8881f6e4f9c7 R09: 1ffff1103edc9f38
R10: 0000000000000000 R11: ffffffff815e8c30 R12: 0000000000000001
R13: 0000000000000007 R14: ffffffff88975cc0 R15: 0000000000000008
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f518f42cf98 CR3: 00000001275e8000 CR4: 00000000003526b0
Call Trace:
 <IRQ>
 find_first_bit include/linux/find.h:210 [inline]
 find_next_bit_wrap include/linux/find.h:460 [inline]
 _nohz_idle_balance+0x14a/0x5a0 kernel/sched/fair.c:12917
 nohz_idle_balance kernel/sched/fair.c:12994 [inline]
 sched_balance_softirq+0x8a/0x170 kernel/sched/fair.c:13229
 handle_softirqs+0x1ab/0x630 kernel/softirq.c:621
 __do_softirq kernel/softirq.c:659 [inline]
 invoke_softirq kernel/softirq.c:476 [inline]
 __irq_exit_rcu+0x48/0xc0 kernel/softirq.c:708
 irq_exit_rcu+0xd/0x30 kernel/softirq.c:720
 instr_sysvec_call_function_single arch/x86/kernel/smp.c:266 [inline]
 sysvec_call_function_single+0x7f/0x90 arch/x86/kernel/smp.c:266
 </IRQ>
 <TASK>
 asm_sysvec_call_function_single+0x1f/0x30 arch/x86/include/asm/idtentry.h:709
RIP: 0010:pv_native_safe_halt+0x17/0x20 arch/x86/kernel/paravirt.c:106
Code: cc cc cc b8 d8 76 9d 0a 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d c3 22 3a 00 f3 0f 1e fa 55 48 89 e5 fb f4 <5d> e9 d3 54 02 00 cc cc cc b8 00 00 00 00 90 90 90 90 90 90 90 90
RSP: 0018:ffffffff87207da0 EFLAGS: 000002c2
RAX: ffff8881f6e00000 RBX: ffffffff87215540 RCX: ffffffff858d30be
RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000041fdc
RBP: ffffffff87207da0 R08: ffff8881f6e39733 R09: 1ffff1103edc72e6
R10: dffffc0000000000 R11: ffffed103edc72e7 R12: 1ffffffff0e42aa8
R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff87cb1ea8
 arch_safe_halt arch/x86/include/asm/paravirt.h:112 [inline]
 default_idle+0x17/0x30 arch/x86/kernel/process.c:754
 arch_cpu_idle+0xd/0x20 arch/x86/kernel/process.c:791
 default_idle_call+0x3f/0x80 kernel/sched/idle.c:117
 cpuidle_idle_call kernel/sched/idle.c:185 [inline]
 do_idle+0x1a0/0x470 kernel/sched/idle.c:326
 cpu_startup_entry+0x48/0x70 kernel/sched/idle.c:424
 rest_init+0x10b/0x130 init/main.c:748
 start_kernel+0x46a/0x4bb init/main.c:1135
 x86_64_start_reservations+0x2e/0x30 arch/x86/kernel/head64.c:507
 x86_64_start_kernel+0x6a/0x7b arch/x86/kernel/head64.c:488
 common_startup_64+0x13b/0x157
 </TASK>