INFO: task syz.2.17:381 blocked for more than 122 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.17        state:D stack:0     pid:381   tgid:381   ppid:377    flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:6053 [inline]
 __schedule+0x1496/0x20b0 kernel/sched/core.c:7866
 __schedule_loop kernel/sched/core.c:7943 [inline]
 schedule+0xc5/0x240 kernel/sched/core.c:7958
 schedule_timeout+0xc7/0x3b0 kernel/time/timer.c:2596
 do_wait_for_common kernel/sched/completion.c:95 [inline]
 __wait_for_common kernel/sched/completion.c:116 [inline]
 wait_for_common+0x368/0x650 kernel/sched/completion.c:127
 wait_for_completion_state+0x19/0x40 kernel/sched/completion.c:264
 coredump_wait fs/coredump.c:448 [inline]
 do_coredump+0x885/0x3050 fs/coredump.c:629
 get_signal+0x11bf/0x1490 kernel/signal.c:2918
 arch_do_signal_or_restart+0xbc/0x700 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]
 irqentry_exit_to_user_mode+0x4d/0xb0 kernel/entry/common.c:231
 irqentry_exit+0x16/0x60 kernel/entry/common.c:334
 exc_page_fault+0x65/0xc0 arch/x86/mm/fault.c:1537
 asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7fe4b2653b27
RSP: 002b:00007ffd22cfa260 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 000000000000000b RCX: 0000000000020f58
RDX: 00007ffd22cfa280 RSI: 00007ffd22cfa3b0 RDI: 000000000000000b
RBP: 00007fe4b2a27da0 R08: 00000000339bbf5d R09: 4000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 00000000000215c6
R13: 00007fe4b2a2609c R14: 00000000000212eb R15: 00007fe4b2a26090
 </TASK>
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 5e823d74124d9c17bee2b333d3eb538db5552cb2
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:94
 dump_stack_lvl+0x140/0x1c0 lib/dump_stack.c:120
 dump_stack+0x19/0x20 lib/dump_stack.c:129
 nmi_cpu_backtrace+0x2ba/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+0xe45/0xf90 kernel/hung_task.c:423
 kthread+0x2c7/0x360 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 5e823d74124d9c17bee2b333d3eb538db5552cb2
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:rcu_preempt_deferred_qs+0x0/0x150 kernel/rcu/tree_plugin.h:616
Code: 89 f7 e8 c3 f7 70 00 e9 bc fe ff ff 41 f7 dd 0f 80 c1 fe ff ff e9 90 fe ff ff b8 a9 0c 40 fc 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 55 48 89 e5 41 57 41 56 41 54 53 48 83 e4 e0 48 83 ec
RSP: 0018:ffffffff87407d98 EFLAGS: 00000056
RAX: 00000000000397ac RBX: ffff8881f6e395e8 RCX: ffffffff85a394dc
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffff874156c0
RBP: ffffffff87407db0 R08: ffff8881f6e395eb R09: 1ffff1103edc72bd
R10: dffffc0000000000 R11: ffffed103edc72be R12: 0000000000000000
R13: 1ffffffff0e82ad8 R14: ffff8881f6e00000 R15: ffffffff87ecafe8
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd3051df00 CR3: 000000010c7a8000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 ct_idle_enter+0xd/0x30 kernel/context_tracking.c:320
 ct_cpuidle_enter include/linux/cpuidle.h:137 [inline]
 default_idle_call+0x39/0x80 kernel/sched/idle.c:116
 cpuidle_idle_call kernel/sched/idle.c:193 [inline]
 do_idle+0x1df/0x570 kernel/sched/idle.c:346
 cpu_startup_entry+0x47/0x60 kernel/sched/idle.c:445
 rest_init+0x10b/0x130 init/main.c:760
 start_kernel+0x462/0x4bb init/main.c:1242
 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>