INFO: task syz.6.1591:5407 blocked for more than 122 seconds.
      Not tainted 6.12.38-syzkaller-g886d2f37b799 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.1591      state:D stack:0     pid:5407  tgid:5404  ppid:4901   flags:0x00004004
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
 super_lock+0x150/0x300 fs/super.c:115
 super_lock_shared fs/super.c:140 [inline]
 iterate_supers+0x8a/0x560 fs/super.c:934
 ksys_sync+0x95/0x160 fs/sync.c:103
 __ia32_sys_sync+0x12/0x20 fs/sync.c:114
 x64_sys_call+0x2a58/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:163
 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: 0033:0x7f49d338ebe9
RSP: 002b:00007f49d4219038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f49d35b6180 RCX: 00007f49d338ebe9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f49d35b6180 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f49d35b6218 R14: 00007f49d35b6180 R15: 00007ffdd35bc468
 </TASK>
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted 6.12.38-syzkaller-g886d2f37b799 #0 f36c02f5443cd552c209ccf9d090ed65beec93f8
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+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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 9949 Comm: syz.1.2887 Not tainted 6.12.38-syzkaller-g886d2f37b799 #0 f36c02f5443cd552c209ccf9d090ed65beec93f8
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:account_freepages mm/page_alloc.c:772 [inline]
RIP: 0010:__free_one_page+0x15a/0x1020 mm/page_alloc.c:932
Code: 00 00 48 8b 4c 24 08 d3 e0 48 63 d8 4c 8b 74 24 10 4c 89 f7 31 f6 48 89 da e8 12 01 f1 ff 8b 54 24 04 83 fa 04 74 27 83 fa 03 <48> 8b 7c 24 18 75 43 48 8b 7c 24 10 be 0a 00 00 00 48 89 da e8 ed
RSP: 0018:ffffc9000f5ff4e0 EFLAGS: 00000093
RAX: 0000000000000018 RBX: 0000000000000001 RCX: 0000000000000005
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff87c26900
RBP: ffffc9000f5ff5f0 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff0e41a69 R12: ffffea0004e290c0
R13: dffffc0000000000 R14: ffffffff87c26900 R15: ffff88813c699300
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000561a2e376b98 CR3: 00000000072a8000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 free_pcppages_bulk+0x3c0/0x550 mm/page_alloc.c:1446
 free_unref_page_commit+0x47f/0xea0 mm/page_alloc.c:2812
 free_unref_page+0x54e/0xee0 mm/page_alloc.c:2872
 __free_pages+0x6b/0x3b0 mm/page_alloc.c:5342
 vfree+0x3bf/0x580 mm/vmalloc.c:3388
 kcov_put kernel/kcov.c:439 [inline]
 kcov_close+0x2c/0x70 kernel/kcov.c:535
 __fput+0x1fb/0xa00 fs/file_table.c:429
 ____fput+0x20/0x30 fs/file_table.c:457
 task_work_run+0x1e0/0x250 kernel/task_work.c:240
 exit_task_work include/linux/task_work.h:43 [inline]
 do_exit+0x9bc/0x2630 kernel/exit.c:953
 do_group_exit+0x22a/0x300 kernel/exit.c:1095
 get_signal+0x139d/0x14f0 kernel/signal.c:2933
 arch_do_signal_or_restart+0x96/0x720 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+0x58/0xb0 kernel/entry/common.c:218
 do_syscall_64+0x64/0xf0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fdc0dbc14a5
Code: Unable to access opcode bytes at 0x7fdc0dbc147b.
RSP: 002b:00007fff2253d190 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: 0000000000000000 RBX: 00007fdc0ddb5fa0 RCX: 00007fdc0dbc14a5
RDX: 00007fff2253d1d0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fdc0ddb7da0 R08: 0000000000000000 R09: 7fffffffffffffff
R10: 0000000000000000 R11: 0000000000000293 R12: 00000000000494fe
R13: 00007fdc0ddb5fa0 R14: ffffffffffffffff R15: 00007fff2253d310
 </TASK>