loop1: detected capacity change from 0 to 2048
EXT4-fs (loop1): shut down requested (0)
==================================================================
BUG: KCSAN: assert: race in __block_task kernel/sched/sched.h:2773 [inline]
BUG: KCSAN: assert: race in dequeue_entities+0x6df/0x760 kernel/sched/fair.c:7180

race at unknown origin, with assert no writes to 0xffff8881001cb1e8 of 4 bytes by task 9527 on cpu 1:
 __block_task kernel/sched/sched.h:2773 [inline]
 dequeue_entities+0x6df/0x760 kernel/sched/fair.c:7180
 pick_next_entity kernel/sched/fair.c:5627 [inline]
 pick_task_fair kernel/sched/fair.c:8859 [inline]
 pick_next_task_fair+0x7d/0x410 kernel/sched/fair.c:8879
 __pick_next_task kernel/sched/core.c:5968 [inline]
 pick_next_task kernel/sched/core.c:6490 [inline]
 __schedule+0x284/0x940 kernel/sched/core.c:6644
 __schedule_loop kernel/sched/core.c:6767 [inline]
 schedule+0x55/0xc0 kernel/sched/core.c:6782
 synchronize_rcu_expedited+0x611/0x7a0 kernel/rcu/tree_exp.h:991
 synchronize_rcu+0x46/0x320 kernel/rcu/tree.c:4095
 rcu_sync_enter+0x125/0x170 kernel/rcu/sync.c:133
 percpu_down_write+0x22/0x220 kernel/locking/percpu-rwsem.c:232
 sb_wait_write fs/super.c:1896 [inline]
 freeze_super+0x354/0x910 fs/super.c:2090
 fs_bdev_freeze+0xfc/0x1e0 fs/super.c:1484
 bdev_freeze+0x8b/0x120 block/bdev.c:257
 ext4_force_shutdown+0x1b8/0x340 fs/ext4/ioctl.c:822
 ext4_ioctl_shutdown fs/ext4/ioctl.c:857 [inline]
 __ext4_ioctl fs/ext4/ioctl.c:1587 [inline]
 ext4_ioctl+0x1225/0x2dd0 fs/ext4/ioctl.c:1626
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xcd/0x140 fs/ioctl.c:893
 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:893
 x64_sys_call+0x15cc/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000000 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 9527 Comm: syz.1.2163 Not tainted 6.12.0-rc5-syzkaller-00047-g4236f913808c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
==================================================================