BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
turning off the locking correctness validator.
CPU: 1 PID: 6636 Comm: syz.5.413 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
 dump_stack+0x1c/0x5c lib/dump_stack.c:113
 add_chain_cache kernel/locking/lockdep.c:-1 [inline]
 lookup_chain_cache_add kernel/locking/lockdep.c:3772 [inline]
 validate_chain kernel/locking/lockdep.c:3793 [inline]
 __lock_acquire+0x1b40/0x6544 kernel/locking/lockdep.c:5049
 lock_acquire+0x20c/0x644 kernel/locking/lockdep.c:5662
 _raw_spin_lock_nested+0x5c/0x78 kernel/locking/spinlock.c:378
 raw_spin_rq_lock_nested kernel/sched/core.c:537 [inline]
 raw_spin_rq_lock kernel/sched/sched.h:1355 [inline]
 rq_lock kernel/sched/sched.h:1645 [inline]
 __schedule+0x2b8/0x1b18 kernel/sched/core.c:6477
 preempt_schedule_irq+0x8c/0x1b8 kernel/sched/core.c:6873
 arm64_preempt_schedule_irq+0x44/0x58 arch/arm64/kernel/entry-common.c:265
 __el1_irq arch/arm64/kernel/entry-common.c:474 [inline]
 el1_interrupt+0x3c/0x54 arch/arm64/kernel/entry-common.c:486
 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:491
 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:581
 arch_local_irq_restore arch/arm64/include/asm/irqflags.h:122 [inline]
 lock_acquire+0x24c/0x644 kernel/locking/lockdep.c:5665
 ww_acquire_init include/linux/ww_mutex.h:149 [inline]
 drm_modeset_acquire_init+0x1a8/0x344 drivers/gpu/drm/drm_modeset_lock.c:250
 drm_client_modeset_commit_atomic+0xd4/0x6b8 drivers/gpu/drm/drm_client_modeset.c:1000
 drm_client_modeset_commit_locked+0xd0/0x4a0 drivers/gpu/drm/drm_client_modeset.c:1164
 __drm_fb_helper_restore_fbdev_mode_unlocked+0x98/0x148 drivers/gpu/drm/drm_fb_helper.c:251
 drm_fb_helper_set_par+0xd0/0x1a4 drivers/gpu/drm/drm_fb_helper.c:1492
 fb_set_var+0x688/0xc90 drivers/video/fbdev/core/fbmem.c:1045
 fbcon_blank+0x238/0x8fc drivers/video/fbdev/core/fbcon.c:2232
 do_unblank_screen+0x2c0/0x7ac drivers/tty/vt/vt.c:4447
 vt_kdsetmode+0x12c/0x1c0 drivers/tty/vt/vt_ioctl.c:276
 vt_k_ioctl drivers/tty/vt/vt_ioctl.c:381 [inline]
 vt_ioctl+0x534/0x1f8c drivers/tty/vt/vt_ioctl.c:752
 tty_ioctl+0x8a0/0xd8c drivers/tty/tty_io.c:2776
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585