INFO: task syz.4.17:528 blocked for more than 122 seconds.
      Not tainted 6.16.0-syzkaller-11241-g186f3edfdd41 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.17        state:D stack:0     pid:528   tgid:525   ppid:482    task_flags:0x400040 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1370/0x1d00 kernel/sched/core.c:6961
 __schedule_loop kernel/sched/core.c:7043 [inline]
 schedule+0xe0/0x280 kernel/sched/core.c:7058
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:7115
 __mutex_lock_common kernel/locking/mutex.c:676 [inline]
 __mutex_lock+0x8d3/0x16b0 kernel/locking/mutex.c:760
 __mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1049
 mutex_lock+0xd7/0xf0 kernel/locking/mutex.c:274
 device_lock include/linux/device.h:911 [inline]
 usbdev_open+0x170/0x840 drivers/usb/core/devio.c:1054
 chrdev_open+0x4dd/0x5f0 fs/char_dev.c:414
 do_dentry_open+0x972/0x13f0 fs/open.c:965
 vfs_open+0x3f/0x350 fs/open.c:1095
 do_open fs/namei.c:3887 [inline]
 path_openat+0x2e1e/0x3750 fs/namei.c:4046
 do_filp_open+0x1fa/0x420 fs/namei.c:4073
 do_sys_openat2+0x121/0x1c0 fs/open.c:1435
 do_sys_open fs/open.c:1450 [inline]
 __do_sys_openat fs/open.c:1466 [inline]
 __se_sys_openat fs/open.c:1461 [inline]
 __x64_sys_openat+0x139/0x170 fs/open.c:1461
 x64_sys_call+0x2e5d/0x2fd0 arch/x86/include/generated/asm/syscalls_64.h:258
 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: 0033:0x7f0e4e18d4d0
RSP: 002b:00007f0e4ef7cb70 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f0e4e18d4d0
RDX: 0000000000000002 RSI: 00007f0e4ef7cc10 RDI: 00000000ffffff9c
RBP: 00007f0e4ef7cc10 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: cccccccccccccccd
R13: 0000000000000000 R14: 00007f0e4e3b5fa0 R15: 00007ffde7032248
 </TASK>
INFO: task syz.3.20:527 blocked for more than 123 seconds.
      Not tainted 6.16.0-syzkaller-11241-g186f3edfdd41 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.20        state:D stack:0     pid:527   tgid:526   ppid:488    task_flags:0x400040 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1370/0x1d00 kernel/sched/core.c:6961
 __schedule_loop kernel/sched/core.c:7043 [inline]
 schedule+0xe0/0x280 kernel/sched/core.c:7058
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:7115
 __mutex_lock_common kernel/locking/mutex.c:676 [inline]
 __mutex_lock+0x8d3/0x16b0 kernel/locking/mutex.c:760
 __mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1049
 mutex_lock+0xd7/0xf0 kernel/locking/mutex.c:274
 device_lock include/linux/device.h:911 [inline]
 usbdev_open+0x170/0x840 drivers/usb/core/devio.c:1054
 chrdev_open+0x4dd/0x5f0 fs/char_dev.c:414
 do_dentry_open+0x972/0x13f0 fs/open.c:965
 vfs_open+0x3f/0x350 fs/open.c:1095
 do_open fs/namei.c:3887 [inline]
 path_openat+0x2e1e/0x3750 fs/namei.c:4046
 do_filp_open+0x1fa/0x420 fs/namei.c:4073
 do_sys_openat2+0x121/0x1c0 fs/open.c:1435
 do_sys_open fs/open.c:1450 [inline]
 __do_sys_openat fs/open.c:1466 [inline]
 __se_sys_openat fs/open.c:1461 [inline]
 __x64_sys_openat+0x139/0x170 fs/open.c:1461
 x64_sys_call+0x2e5d/0x2fd0 arch/x86/include/generated/asm/syscalls_64.h:258
 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: 0033:0x7f7cf5f8d4d0
RSP: 002b:00007f7cf6d4eb70 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f7cf5f8d4d0
RDX: 0000000000000002 RSI: 00007f7cf6d4ec10 RDI: 00000000ffffff9c
RBP: 00007f7cf6d4ec10 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: cccccccccccccccd
R13: 0000000000000000 R14: 00007f7cf61b5fa0 R15: 00007fff0a616e58
 </TASK>
INFO: task syz.5.18:532 blocked for more than 123 seconds.
      Not tainted 6.16.0-syzkaller-11241-g186f3edfdd41 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.18        state:D stack:0     pid:532   tgid:531   ppid:485    task_flags:0x400040 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1370/0x1d00 kernel/sched/core.c:6961
 __schedule_loop kernel/sched/core.c:7043 [inline]
 schedule+0xe0/0x280 kernel/sched/core.c:7058
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:7115
 __mutex_lock_common kernel/locking/mutex.c:676 [inline]
 __mutex_lock+0x8d3/0x16b0 kernel/locking/mutex.c:760
 __mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1049
 mutex_lock+0xd7/0xf0 kernel/locking/mutex.c:274
 device_lock include/linux/device.h:911 [inline]
 usbdev_open+0x170/0x840 drivers/usb/core/devio.c:1054
 chrdev_open+0x4dd/0x5f0 fs/char_dev.c:414
 do_dentry_open+0x972/0x13f0 fs/open.c:965
 vfs_open+0x3f/0x350 fs/open.c:1095
 do_open fs/namei.c:3887 [inline]
 path_openat+0x2e1e/0x3750 fs/namei.c:4046
 do_filp_open+0x1fa/0x420 fs/namei.c:4073
 do_sys_openat2+0x121/0x1c0 fs/open.c:1435
 do_sys_open fs/open.c:1450 [inline]
 __do_sys_openat fs/open.c:1466 [inline]
 __se_sys_openat fs/open.c:1461 [inline]
 __x64_sys_openat+0x139/0x170 fs/open.c:1461
 x64_sys_call+0x2e5d/0x2fd0 arch/x86/include/generated/asm/syscalls_64.h:258
 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: 0033:0x7f624cf8d4d0
RSP: 002b:00007f624dda8b70 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f624cf8d4d0
RDX: 0000000000000002 RSI: 00007f624dda8c10 RDI: 00000000ffffff9c
RBP: 00007f624dda8c10 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: cccccccccccccccd
R13: 0000000000000000 R14: 00007f624d1b5fa0 R15: 00007ffd4c1c3098
 </TASK>
INFO: task syz.2.19:535 blocked for more than 123 seconds.
      Not tainted 6.16.0-syzkaller-11241-g186f3edfdd41 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.19        state:D stack:0     pid:535   tgid:534   ppid:487    task_flags:0x400040 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1370/0x1d00 kernel/sched/core.c:6961
 __schedule_loop kernel/sched/core.c:7043 [inline]
 schedule+0xe0/0x280 kernel/sched/core.c:7058
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:7115
 __mutex_lock_common kernel/locking/mutex.c:676 [inline]
 __mutex_lock+0x8d3/0x16b0 kernel/locking/mutex.c:760
 __mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1049
 mutex_lock+0xd7/0xf0 kernel/locking/mutex.c:274
 device_lock include/linux/device.h:911 [inline]
 usbdev_open+0x170/0x840 drivers/usb/core/devio.c:1054
 chrdev_open+0x4dd/0x5f0 fs/char_dev.c:414
 do_dentry_open+0x972/0x13f0 fs/open.c:965
 vfs_open+0x3f/0x350 fs/open.c:1095
 do_open fs/namei.c:3887 [inline]
 path_openat+0x2e1e/0x3750 fs/namei.c:4046
 do_filp_open+0x1fa/0x420 fs/namei.c:4073
 do_sys_openat2+0x121/0x1c0 fs/open.c:1435
 do_sys_open fs/open.c:1450 [inline]
 __do_sys_openat fs/open.c:1466 [inline]
 __se_sys_openat fs/open.c:1461 [inline]
 __x64_sys_openat+0x139/0x170 fs/open.c:1461
 x64_sys_call+0x2e5d/0x2fd0 arch/x86/include/generated/asm/syscalls_64.h:258
 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: 0033:0x7fd36a58d4d0
RSP: 002b:00007fd36b329b70 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fd36a58d4d0
RDX: 0000000000000002 RSI: 00007fd36b329c10 RDI: 00000000ffffff9c
RBP: 00007fd36b329c10 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: cccccccccccccccd
R13: 0000000000000000 R14: 00007fd36a7b5fa0 R15: 00007fff4c700828
 </TASK>
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted 6.16.0-syzkaller-11241-g186f3edfdd41 #0 PREEMPT  c2ac1372e8a350c526a43912755a663ae6765328
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:307 [inline]
 watchdog+0xc2c/0xc80 kernel/hung_task.c:470
 kthread+0x6f4/0x880 kernel/kthread.c:464
 ret_from_fork+0x147/0x1f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 6.16.0-syzkaller-11241-g186f3edfdd41 #0 PREEMPT  c2ac1372e8a350c526a43912755a663ae6765328
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:pv_native_safe_halt+0x17/0x20 arch/x86/kernel/paravirt.c:82
Code: cc cc cc b8 25 15 93 ae 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 83 b0 0e 00 f3 0f 1e fa 55 48 89 e5 fb f4 <5d> e9 13 6c 02 00 cc cc cc b8 00 00 00 00 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000187e00 EFLAGS: 000002c6
RAX: ffff88826e8a0000 RBX: ffff888103662280 RCX: ffffffff8598a79e
RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000e60044
RBP: ffffc90000187e00 R08: ffff8881f6f34603 R09: 1ffff1103ede68c0
R10: dffffc0000000000 R11: ffffed103ede68c1 R12: 1ffff110206cc450
R13: 0000000000000001 R14: 0000000000000000 R15: ffffffff87a707b0
FS:  0000000000000000(0000) GS:ffff88826e8a0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055559472c4a8 CR3: 000000010b3ce000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
 default_idle+0x17/0x30 arch/x86/kernel/process.c:757
 arch_cpu_idle+0xd/0x20 arch/x86/kernel/process.c:794
 default_idle_call+0x3f/0x80 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:190 [inline]
 do_idle+0x19c/0x470 kernel/sched/idle.c:330
 cpu_startup_entry+0x48/0x70 kernel/sched/idle.c:428
 start_secondary+0x12a/0x140 arch/x86/kernel/smpboot.c:315
 common_startup_64+0x13b/0x157
 </TASK>