INFO: task syz.2.2647:19532 blocked for more than 144 seconds.
      Not tainted 6.12.0-rc2-next-20241008-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.2647      state:D stack:27024 pid:19532 tgid:19531 ppid:18426  flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0x1895/0x4b30 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6774
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6831
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a7/0xd70 kernel/locking/mutex.c:752
 chaoskey_release+0x169/0x2f0 drivers/usb/misc/chaoskey.c:322
 __fput+0x23f/0x880 fs/file_table.c:431
 task_work_run+0x24f/0x310 kernel/task_work.c:228
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [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+0x168/0x370 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f910bb7dff9
RSP: 002b:00007f910ca02038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffed RBX: 00007f910bd35f80 RCX: 00007f910bb7dff9
RDX: 0000000000000080 RSI: 0000000020000200 RDI: 0000000000000006
RBP: 00007f910bbf0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f910bd35f80 R15: 00007ffe02086768
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc2-next-20241008-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
 watchdog+0xff4/0x1040 kernel/hung_task.c:379
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 21248 Comm: syz.4.2891 Not tainted 6.12.0-rc2-next-20241008-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:rcu_preempt_read_enter kernel/rcu/tree_plugin.h:390 [inline]
RIP: 0010:__rcu_read_lock+0x30/0xb0 kernel/rcu/tree_plugin.h:413
Code: 57 41 56 53 49 be 00 00 00 00 00 fc ff df 65 4c 8b 3c 25 40 d8 03 00 49 81 c7 44 04 00 00 4c 89 fb 48 c1 eb 03 42 0f b6 04 33 <84> c0 75 35 41 8b 2f ff c5 42 0f b6 04 33 84 c0 75 3e 41 89 2f 42
RSP: 0018:ffffc900042c77e0 EFLAGS: 00000a03
RAX: 0000000000000000 RBX: 1ffff1100ad01bc8 RCX: ffff88805680da00
RDX: 0000000000000000 RSI: 00000000ff000000 RDI: ffffea0001357800
RBP: dffffc0000000000 R08: ffffffff820b697d R09: 1ffff1100e3ce4f3
R10: dffffc0000000000 R11: ffffed100e3ce4f4 R12: 0000000000000000
R13: ffffea0001357808 R14: dffffc0000000000 R15: ffff88805680de44
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c438fb0 CR3: 0000000035db4000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 rcu_read_lock include/linux/rcupdate.h:847 [inline]
 page_ext_get+0x19/0x2a0 mm/page_ext.c:525
 __page_table_check_zero+0xb1/0x350 mm/page_table_check.c:148
 page_table_check_free include/linux/page_table_check.h:41 [inline]
 free_pages_prepare mm/page_alloc.c:1109 [inline]
 free_unref_page+0xd0f/0xf20 mm/page_alloc.c:2674
 vfree+0x186/0x2e0 mm/vmalloc.c:3377
 kcov_put kernel/kcov.c:439 [inline]
 kcov_close+0x28/0x50 kernel/kcov.c:535
 __fput+0x23f/0x880 fs/file_table.c:431
 task_work_run+0x24f/0x310 kernel/task_work.c:228
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0xa2f/0x28e0 kernel/exit.c:939
 do_group_exit+0x207/0x2c0 kernel/exit.c:1088
 get_signal+0x16a3/0x1740 kernel/signal.c:2917
 arch_do_signal_or_restart+0x96/0x860 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+0xc9/0x370 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6db137dff9
Code: Unable to access opcode bytes at 0x7f6db137dfcf.
RSP: 002b:00007f6db2227038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: 0000000020000000 RBX: 00007f6db1536058 RCX: 00007f6db137dff9
RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000000020000000
RBP: 00007f6db13f0296 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f6db1536058 R15: 00007ffe3554c128
 </TASK>