INFO: task syz.4.1757:5600 blocked for more than 122 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.1757      state:D stack:0     pid:5600  tgid:5567  ppid:4431   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:6063 [inline]
 __schedule+0x1496/0x20b0 kernel/sched/core.c:7883
 __schedule_loop kernel/sched/core.c:7960 [inline]
 schedule+0xc5/0x240 kernel/sched/core.c:7975
 super_lock+0x168/0x330 fs/super.c:117
 super_lock_shared fs/super.c:142 [inline]
 iterate_supers+0x86/0x570 fs/super.c:937
 drop_caches_sysctl_handler+0xa2/0x180 fs/drop_caches.c:64
 proc_sys_call_handler+0x522/0x880 fs/proc/proc_sysctl.c:595
 proc_sys_write+0x26/0x30 fs/proc/proc_sysctl.c:621
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x762/0xfd0 fs/read_write.c:684
 ksys_write+0x145/0x260 fs/read_write.c:737
 __do_sys_write fs/read_write.c:749 [inline]
 __se_sys_write fs/read_write.c:746 [inline]
 __x64_sys_write+0x7f/0x90 fs/read_write.c:746
 x64_sys_call+0x271c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f002d79e159
RSP: 002b:00007f002e6d8028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f002da26090 RCX: 00007f002d79e159
RDX: 0000000000000001 RSI: 00002000000006c0 RDI: 0000000000000007
RBP: 00007f002d835024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f002da26128 R14: 00007f002da26090 R15: 00007ffc31e32a58
 </TASK>
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 5b18096d2acadad9f3a622c0de28b00c51d60767
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
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+0x2c4/0x360 kernel/kthread.c:389
 ret_from_fork+0x64/0xa0 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: 203 Comm: getty Not tainted syzkaller #0 5b18096d2acadad9f3a622c0de28b00c51d60767
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:entry_SYSCALL_64_safe_stack+0x2/0xe
Code: fa 0f 01 f8 65 48 89 25 85 9f 40 7a 66 90 0f 20 dc 0f 1f 44 00 00 48 81 e4 ff e7 ff ff 0f 22 dc 65 48 8b 25 2d eb 44 7a 6a 2b <65> ff 35 60 9f 40 7a 41 53 6a 33 51 50 57 56 52 51 6a da 41 50 41
RSP: 0018:ffffc90000e5fff8 EFLAGS: 00000006
RAX: 0000000000000001 RBX: 00007f7cfe4d9c80 RCX: 00007f7cfe629407
RDX: 0000000000000001 RSI: 00007f7cfe824c06 RDI: 0000000000000001
RBP: 00007f7cfe824c06 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000001
R13: 00007f7cfe4d9c08 R14: 0000000000000002 R15: 0000000000000002
FS:  00007f7cfe4d9c80(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005614dbbf93e8 CR3: 000000010c73a000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 </TASK>