INFO: task syz.0.7685:30655 blocked for more than 143 seconds.
      Not tainted 6.17.0-rc2-next-20250818-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.7685      state:D stack:26408 pid:30655 tgid:30654 ppid:21717  task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
 __schedule_loop kernel/sched/core.c:7043 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:7058
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7115
 __mutex_lock_common kernel/locking/mutex.c:676 [inline]
 __mutex_lock+0x7e6/0x1350 kernel/locking/mutex.c:760
 bdev_open+0xe0/0xd30 block/bdev.c:945
 bdev_file_open_by_dev+0x1be/0x240 block/bdev.c:1059
 setup_bdev_super+0x5a/0x5b0 fs/super.c:1610
 get_tree_bdev_flags+0x366/0x4d0 fs/super.c:1690
 vfs_get_tree+0x8f/0x2b0 fs/super.c:1752
 do_new_mount+0x2a2/0xa30 fs/namespace.c:3810
 do_mount fs/namespace.c:4138 [inline]
 __do_sys_mount fs/namespace.c:4349 [inline]
 __se_sys_mount+0x317/0x410 fs/namespace.c:4326
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f00b418ebe9
RSP: 002b:00007f00b50c6038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f00b43b5fa0 RCX: 00007f00b418ebe9
RDX: 0000200000000080 RSI: 00002000000001c0 RDI: 0000200000000000
RBP: 00007f00b4211e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000200000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f00b43b6038 R14: 00007f00b43b5fa0 R15: 00007ffc449de998
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.17.0-rc2-next-20250818-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:332 [inline]
 watchdog+0xf60/0xfa0 kernel/hung_task.c:495
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x3f9/0x770 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: 29111 Comm: syz.2.7356 Not tainted 6.17.0-rc2-next-20250818-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:set_task_cpu+0x10e/0x990 kernel/sched/core.c:3351
Code: 77 07 00 00 41 8b 07 83 f8 02 0f 85 aa 05 00 00 48 c7 c0 70 26 e5 8f 48 c1 e8 03 49 bf 00 00 00 00 00 fc ff df 42 0f b6 04 38 <84> c0 0f 85 ae 05 00 00 83 3d 93 3c 54 0e 00 0f 84 e1 00 00 00 49
RSP: 0018:ffffc90000a08850 EFLAGS: 00000802
RAX: 0000000000000000 RBX: 1ffff1100fc3e3cd RCX: dffffc0000000000
RDX: ffff88807e1f1e00 RSI: 0000000000000001 RDI: ffff88807e1f1e00
RBP: 0000000000000000 R08: ffffffff8fe4f537 R09: 1ffffffff1fc9ea6
R10: dffffc0000000000 R11: fffffbfff1fc9ea7 R12: ffff88807e1f1e00
R13: dffffc0000000000 R14: 0000000000000001 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881258d0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f013dfe000 CR3: 000000000e336000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 detach_tasks kernel/sched/fair.c:9539 [inline]
 sched_balance_rq+0x3f39/0x57a0 kernel/sched/fair.c:11714
 sched_balance_domains+0x49f/0x9e0 kernel/sched/fair.c:12141
 handle_softirqs+0x283/0x870 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:deref_stack_reg+0x1b3/0x230 arch/x86/kernel/unwind_orc.c:406
Code: 39 f0 0f 96 c0 20 c8 3c 01 75 30 4c 89 c7 49 89 f7 e8 11 08 00 00 49 89 c6 48 8b 5c 24 18 48 89 d8 48 c1 e8 03 42 80 3c 38 00 <74> 08 48 89 df e8 a3 79 b0 00 4c 89 33 b0 01 eb 02 31 c0 48 83 c4
RSP: 0018:ffffc900044674e0 EFLAGS: 00000246
RAX: 1ffff9200088cec9 RBX: ffffc90004467648 RCX: 0000000000000001
RDX: ffffc90004467648 RSI: dffffc0000000000 RDI: ffffc90004467730
RBP: 1ffff9200088cec1 R08: ffffc90004467730 R09: 0000000000000000
R10: ffffc90004467658 R11: fffff5200088cecd R12: 1ffff9200088cec2
R13: 1ffff9200088cec3 R14: ffffc90004467870 R15: dffffc0000000000
 unwind_next_frame+0x17c4/0x2390 arch/x86/kernel/unwind_orc.c:-1
 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
 save_stack+0xf5/0x1f0 mm/page_owner.c:156
 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:308
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2895
 vfree+0x25a/0x400 mm/vmalloc.c:3434
 kcov_put kernel/kcov.c:439 [inline]
 kcov_close+0x28/0x50 kernel/kcov.c:535
 __fput+0x449/0xa70 fs/file_table.c:468
 task_work_run+0x1d4/0x260 kernel/task_work.c:227
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x6b5/0x2300 kernel/exit.c:961
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1102
 get_signal+0x1286/0x1340 kernel/signal.c:3034
 arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0x75/0x130 kernel/entry/common.c:40
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe9fb7c14a5
Code: Unable to access opcode bytes at 0x7fe9fb7c147b.
RSP: 002b:00007fe9fc55af80 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: fffffffffffffdfc RBX: 00007fe9fb9b6090 RCX: 00007fe9fb7c14a5
RDX: 00007fe9fc55afc0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fe9fb811e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007fe9fb9b6128 R14: 00007fe9fb9b6090 R15: 00007ffe2d61ff58
 </TASK>