------------[ cut here ]------------
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Tainted: G     U       L     
------------------------------------------------------
syz.3.2858/15137 is trying to acquire lock:
ffffffff8e6f1560 (console_owner){-.-.}-{0:0}, at: console_lock_spinning_enable+0x61/0x80 kernel/printk/printk.c:1902

but task is already holding lock:
ffff8880b843b3e0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:660 [inline]
ffff8880b843b3e0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x88/0x140 kernel/sched/core.c:644

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #4 (&rq->__lock){-.-.}-{2:2}:
       _raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:382
       raw_spin_rq_lock_nested+0x2c/0x140 kernel/sched/core.c:652
       raw_spin_rq_lock kernel/sched/sched.h:1624 [inline]
       _task_rq_lock+0xcf/0x510 kernel/sched/core.c:747
       cgroup_move_task+0x81/0x320 kernel/sched/psi.c:1170
       css_set_move_task+0x285/0x600 kernel/cgroup/cgroup.c:899
       cgroup_post_fork+0x202/0x9b0 kernel/cgroup/cgroup.c:6944
       copy_process+0x5b9a/0x7ed0 kernel/fork.c:2524
       kernel_clone+0x12e/0x9c0 kernel/fork.c:2721
       user_mode_thread+0xcc/0x110 kernel/fork.c:2797
       rest_init+0x21/0x260 init/main.c:727
       start_kernel+0x484/0x490 init/main.c:1220
       x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
       x86_64_start_kernel+0x12b/0x130 arch/x86/kernel/head64.c:291
       common_startup_64+0x13e/0x148

-> #3 (&p->pi_lock){-.-.}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
       _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:166
       class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:571 [inline]
       try_to_wake_up+0xb5/0x1900 kernel/sched/core.c:4190
       __wake_up_common+0x135/0x1f0 kernel/sched/wait.c:108
       __wake_up_common_lock kernel/sched/wait.c:125 [inline]
       __wake_up+0x31/0x60 kernel/sched/wait.c:146
       tty_port_default_wakeup+0x52/0x70 drivers/tty/tty_port.c:67
       serial8250_tx_chars+0x68f/0x860 drivers/tty/serial/8250/8250_port.c:1721
       serial8250_handle_irq_locked+0x5e6/0x7e0 drivers/tty/serial/8250/8250_port.c:1825
       serial8250_handle_irq.part.0+0xb4/0x530 drivers/tty/serial/8250/8250_port.c:1841
       serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1837 [inline]
       serial8250_default_handle_irq+0xc2/0x290 drivers/tty/serial/8250/8250_port.c:1855
       serial8250_interrupt+0xf8/0x1c0 drivers/tty/serial/8250/8250_core.c:86
       __handle_irq_event_percpu+0x235/0x8c0 kernel/irq/handle.c:209
       handle_irq_event_percpu kernel/irq/handle.c:246 [inline]
       handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:263
       handle_edge_irq+0x35e/0x960 kernel/irq/chip.c:857
       generic_handle_irq_desc include/linux/irqdesc.h:186 [inline]
       handle_irq arch/x86/kernel/irq.c:262 [inline]
       call_irq_handler arch/x86/kernel/irq.c:318 [inline]
       __common_interrupt+0xd8/0x2f0 arch/x86/kernel/irq.c:333
       common_interrupt+0xb9/0xe0 arch/x86/kernel/irq.c:326
       asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688
       unwind_next_frame+0x14f0/0x2090 arch/x86/kernel/unwind_orc.c:677
       arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25
       stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
       kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
       kasan_save_track+0x14/0x30 mm/kasan/common.c:78
       unpoison_slab_object mm/kasan/common.c:340 [inline]
       __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:366
       kasan_slab_alloc include/linux/kasan.h:253 [inline]
       slab_post_alloc_hook mm/slub.c:4569 [inline]
       kmem_cache_alloc_from_sheaf_noprof+0xa9/0x190 mm/slub.c:5208
       mas_pop_node lib/maple_tree.c:1065 [inline]
       dst_setup+0x339/0x950 lib/maple_tree.c:2350
       mas_wr_split+0xa79/0x3960 lib/maple_tree.c:3460
       mas_wr_store_entry+0xd06/0x1e80 lib/maple_tree.c:3537
       mas_store_prealloc+0x6df/0x1090 lib/maple_tree.c:4936
       vma_iter_store_new mm/vma.h:623 [inline]
       __mmap_new_vma mm/vma.c:2583 [inline]
       __mmap_region+0x181e/0x2da0 mm/vma.c:2771
       mmap_region+0x35d/0x620 mm/vma.c:2857
       do_mmap+0xc63/0x12f0 mm/mmap.c:560
       vm_mmap_pgoff+0x29e/0x470 mm/util.c:581
       ksys_mmap_pgoff+0xe4/0x610 mm/mmap.c:606
       __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
       __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
       __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #2 (&tty->write_wait){-.-.}-{3:3}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
       _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:166
       __wake_up_common_lock kernel/sched/wait.c:124 [inline]
       __wake_up+0x1c/0x60 kernel/sched/wait.c:146
       tty_port_default_wakeup+0x52/0x70 drivers/tty/tty_port.c:67
       serial8250_tx_chars+0x68f/0x860 drivers/tty/serial/8250/8250_port.c:1721
       serial8250_handle_irq_locked+0x5e6/0x7e0 drivers/tty/serial/8250/8250_port.c:1825
       serial8250_handle_irq.part.0+0xb4/0x530 drivers/tty/serial/8250/8250_port.c:1841
       serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1837 [inline]
       serial8250_default_handle_irq+0xc2/0x290 drivers/tty/serial/8250/8250_port.c:1855
       serial8250_interrupt+0xf8/0x1c0 drivers/tty/serial/8250/8250_core.c:86
       __handle_irq_event_percpu+0x235/0x8c0 kernel/irq/handle.c:209
       handle_irq_event_percpu kernel/irq/handle.c:246 [inline]
       handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:263
       handle_edge_irq+0x35e/0x960 kernel/irq/chip.c:857
       generic_handle_irq_desc include/linux/irqdesc.h:186 [inline]
       handle_irq arch/x86/kernel/irq.c:262 [inline]
       call_irq_handler arch/x86/kernel/irq.c:318 [inline]
       __common_interrupt+0xd8/0x2f0 arch/x86/kernel/irq.c:333
       common_interrupt+0xb9/0xe0 arch/x86/kernel/irq.c:326
       asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688
       native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
       pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:62
       arch_safe_halt arch/x86/include/asm/paravirt.h:62 [inline]
       default_idle+0x9/0x10 arch/x86/kernel/process.c:767
       default_idle_call+0x6c/0xb0 kernel/sched/idle.c:122
       cpuidle_idle_call kernel/sched/idle.c:199 [inline]
       do_idle+0x464/0x590 kernel/sched/idle.c:352
       cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:451
       rest_init+0x251/0x260 init/main.c:762
       start_kernel+0x484/0x490 init/main.c:1220
       x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
       x86_64_start_kernel+0x12b/0x130 arch/x86/kernel/head64.c:291
       common_startup_64+0x13e/0x148

-> #1 (&port_lock_key){-.-.}-{3:3}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
       _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:166
       uart_port_lock_irqsave include/linux/serial_core.h:717 [inline]
       serial8250_console_write+0x17e/0x1900 drivers/tty/serial/8250/8250_port.c:3316
       console_emit_next_record kernel/printk/printk.c:3183 [inline]
       console_flush_one_record+0x790/0xe50 kernel/printk/printk.c:3269
       console_flush_all kernel/printk/printk.c:3343 [inline]
       __console_flush_and_unlock kernel/printk/printk.c:3373 [inline]
       console_unlock+0x103/0x260 kernel/printk/printk.c:3413
       vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2479
       _printk+0xcf/0x110 kernel/printk/printk.c:2504
       register_console.cold+0xc0/0x248 kernel/printk/printk.c:4208
       univ8250_console_init+0x6f/0x80 drivers/tty/serial/8250/8250_core.c:515
       console_init+0x3f7/0x5e0 kernel/printk/printk.c:4407
       start_kernel+0x30a/0x490 init/main.c:1157
       x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
       x86_64_start_kernel+0x12b/0x130 arch/x86/kernel/head64.c:291
       common_startup_64+0x13e/0x148

-> #0 (console_owner){-.-.}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3165 [inline]
       check_prevs_add kernel/locking/lockdep.c:3284 [inline]
       validate_chain kernel/locking/lockdep.c:3908 [inline]
       __lock_acquire+0x14b8/0x2630 kernel/locking/lockdep.c:5237
       lock_acquire kernel/locking/lockdep.c:5868 [inline]
       lock_acquire+0x1b1/0x370 kernel/locking/lockdep.c:5825
       console_lock_spinning_enable+0x72/0x80 kernel/printk/printk.c:1902
       console_emit_next_record kernel/printk/printk.c:3177 [inline]
       console_flush_one_record+0x739/0xe50 kernel/printk/printk.c:3269
       console_flush_all kernel/printk/printk.c:3343 [inline]
       __console_flush_and_unlock kernel/printk/printk.c:3373 [inline]
       console_unlock+0x103/0x260 kernel/printk/printk.c:3413
       vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2479
       _printk+0xcf/0x110 kernel/printk/printk.c:2504
       __report_bug.cold+0x15/0x137 lib/bug.c:240
       report_bug+0xb2/0x220 lib/bug.c:278
       handle_bug+0x16a/0x2a0 arch/x86/kernel/traps.c:436
       exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:490
       asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:616
       lockdep_assert_rq_held kernel/sched/sched.h:1612 [inline]
       lockdep_assert_rq_held kernel/sched/sched.h:1609 [inline]
       update_rq_clock+0x40a/0xd20 kernel/sched/core.c:850
       pick_next_task kernel/sched/core.c:6222 [inline]
       __schedule+0x1e84/0x67a0 kernel/sched/core.c:7105
       preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7513
       irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:468 [inline]
       irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
       irqentry_exit+0x205/0x7e0 kernel/entry/common.c:164
       asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
       check_kcov_mode kernel/kcov.c:185 [inline]
       __sanitizer_cov_trace_pc+0x3f/0x70 kernel/kcov.c:217
       vb2_get_buffer include/media/videobuf2-core.h:1283 [inline]
       __vb2_queue_free+0x5fd/0xa30 drivers/media/common/videobuf2/videobuf2-core.c:679
       vb2_core_queue_release+0x70/0x190 drivers/media/common/videobuf2/videobuf2-core.c:2679
       vb2_queue_release drivers/media/common/videobuf2/videobuf2-v4l2.c:956 [inline]
       _vb2_fop_release+0xe8/0x280 drivers/media/common/videobuf2/videobuf2-v4l2.c:1159
       vivid_fop_release+0x155/0xc30 drivers/media/test-drivers/vivid/vivid-core.c:667
       v4l2_release+0x1cf/0x390 drivers/media/v4l2-core/v4l2-dev.c:468
       __fput+0x3ff/0xb50 fs/file_table.c:510
       task_work_run+0x150/0x240 kernel/task_work.c:233
       get_signal+0x1b9/0x2210 kernel/signal.c:2809
       arch_do_signal_or_restart+0x91/0x7a0 arch/x86/kernel/signal.c:337
       __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
       exit_to_user_mode_loop+0x8b/0x4f0 kernel/entry/common.c:98
       __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
       syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
       syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
       do_syscall_64+0x6f2/0xf80 arch/x86/entry/syscall_64.c:100
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

Chain exists of:
  console_owner --> &p->pi_lock --> &rq->__lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&rq->__lock);
                               lock(&p->pi_lock);
                               lock(&rq->__lock);
  lock(console_owner);

 *** DEADLOCK ***

6 locks held by syz.3.2858/15137:
 #0: ffff888030310438 (&mdev->req_queue_mutex){+.+.}-{4:4}, at: v4l2_release+0x179/0x390 drivers/media/v4l2-core/v4l2-dev.c:467
 #1: ffff888030315e10 (&dev->mutex#3){+.+.}-{4:4}, at: _vb2_fop_release+0x43/0x280 drivers/media/common/videobuf2/videobuf2-v4l2.c:1157
 #2: ffff8880303184c0 (&q->mmap_lock){+.+.}-{4:4}, at: vb2_core_queue_release+0x31/0x190 drivers/media/common/videobuf2/videobuf2-core.c:2678
 #3: ffff8880b843b3e0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:660 [inline]
 #3: ffff8880b843b3e0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x88/0x140 kernel/sched/core.c:644
 #4: ffffffff8e7d19a0 (console_lock){+.+.}-{0:0}, at: _printk+0xcf/0x110 kernel/printk/printk.c:2504
 #5: ffffffff8e7d1a18 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:305 [inline]
 #5: ffffffff8e7d1a18 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:428 [inline]
 #5: ffffffff8e7d1a18 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:291 [inline]
 #5: ffffffff8e7d1a18 (console_srcu){....}-{0:0}, at: console_flush_one_record+0xfd/0xe50 kernel/printk/printk.c:3246

stack backtrace:
CPU: 0 UID: 0 PID: 15137 Comm: syz.3.2858 Tainted: G     U       L      syzkaller #0 PREEMPT(full) 
Tainted: [U]=USER, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 print_circular_bug.cold+0x178/0x1c7 kernel/locking/lockdep.c:2043
 check_noncircular+0x146/0x160 kernel/locking/lockdep.c:2175
 check_prev_add kernel/locking/lockdep.c:3165 [inline]
 check_prevs_add kernel/locking/lockdep.c:3284 [inline]
 validate_chain kernel/locking/lockdep.c:3908 [inline]
 __lock_acquire+0x14b8/0x2630 kernel/locking/lockdep.c:5237
 lock_acquire kernel/locking/lockdep.c:5868 [inline]
 lock_acquire+0x1b1/0x370 kernel/locking/lockdep.c:5825
 console_lock_spinning_enable+0x72/0x80 kernel/printk/printk.c:1902
 console_emit_next_record kernel/printk/printk.c:3177 [inline]
 console_flush_one_record+0x739/0xe50 kernel/printk/printk.c:3269
 console_flush_all kernel/printk/printk.c:3343 [inline]
 __console_flush_and_unlock kernel/printk/printk.c:3373 [inline]
 console_unlock+0x103/0x260 kernel/printk/printk.c:3413
 vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2479
 _printk+0xcf/0x110 kernel/printk/printk.c:2504
 __report_bug.cold+0x15/0x137 lib/bug.c:240
 report_bug+0xb2/0x220 lib/bug.c:278
 handle_bug+0x16a/0x2a0 arch/x86/kernel/traps.c:436
 exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:490
 asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:616
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1612 [inline]
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1609 [inline]
RIP: 0010:update_rq_clock+0x40a/0xd20 kernel/sched/core.c:850
Code: ab 88 0b 00 00 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc a8 04 0f 84 df fc ff ff 90 0f 0b 90 e9 d6 fc ff ff 90 <0f> 0b 90 e9 92 fc ff ff 4c 8d 83 80 0b 00 00 48 b8 00 00 00 00 00
RSP: 0018:ffffc90004127738 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff8880b853b380 RCX: 0000000000000001
RDX: 0000000000000046 RSI: ffffffff8def921a RDI: ffffffff8c1c3a00
RBP: ffffc900041278e8 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90d7fb57 R11: 0000000000000000 R12: ffffffff90d82ec4
R13: ffff8880b853c220 R14: ffff88801e681ec0 R15: ffff8880b853b380
 pick_next_task kernel/sched/core.c:6222 [inline]
 __schedule+0x1e84/0x67a0 kernel/sched/core.c:7105
 preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7513
 irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:468 [inline]
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x205/0x7e0 kernel/entry/common.c:164
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__sanitizer_cov_trace_pc+0x3f/0x70 kernel/kcov.c:217
Code: 02 12 a9 00 01 ff 00 74 1b f6 c4 01 74 07 a9 00 00 ff 00 74 05 e9 11 80 83 09 8b 82 d4 16 00 00 85 c0 74 f1 8b 82 b0 16 00 00 <83> f8 02 75 e6 48 8b 8a b8 16 00 00 8b 92 b4 16 00 00 48 8b 01 48
RSP: 0018:ffffc90004127a00 EFLAGS: 00000246
RAX: 0000000000000002 RBX: 000000000000722c RCX: ffffffff87fc3553
RDX: ffff8880281bbd80 RSI: ffffffff87fc344d RDI: ffff8880281bbd80
RBP: ffff8880303183b8 R08: 0000000000000004 R09: 000000000000722c
R10: 0000000000008000 R11: 0000000000000000 R12: dffffc0000000000
R13: 000000000000722b R14: 0000000000008000 R15: 1ffff110060630a0
 vb2_get_buffer include/media/videobuf2-core.h:1283 [inline]
 __vb2_queue_free+0x5fd/0xa30 drivers/media/common/videobuf2/videobuf2-core.c:679
 vb2_core_queue_release+0x70/0x190 drivers/media/common/videobuf2/videobuf2-core.c:2679
 vb2_queue_release drivers/media/common/videobuf2/videobuf2-v4l2.c:956 [inline]
 _vb2_fop_release+0xe8/0x280 drivers/media/common/videobuf2/videobuf2-v4l2.c:1159
 vivid_fop_release+0x155/0xc30 drivers/media/test-drivers/vivid/vivid-core.c:667
 v4l2_release+0x1cf/0x390 drivers/media/v4l2-core/v4l2-dev.c:468
 __fput+0x3ff/0xb50 fs/file_table.c:510
 task_work_run+0x150/0x240 kernel/task_work.c:233
 get_signal+0x1b9/0x2210 kernel/signal.c:2809
 arch_do_signal_or_restart+0x91/0x7a0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop+0x8b/0x4f0 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x6f2/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa6d879ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa6d971d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000017
RAX: 0000000000000006 RBX: 00007fa6d8a16090 RCX: 00007fa6d879ce59
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000000000e
RBP: 00007fa6d8832d6f R08: 0000000000000000 R09: 0000000000000000
R10: 00002000000002c0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa6d8a16128 R14: 00007fa6d8a16090 R15: 00007ffd0eef1358
 </TASK>
debug_locks && !(lock_is_held(&(__rq_lockp(rq))->dep_map) != 0)
WARNING: kernel/sched/sched.h:1612 at lockdep_assert_rq_held kernel/sched/sched.h:1612 [inline], CPU#0: syz.3.2858/15137
WARNING: kernel/sched/sched.h:1612 at lockdep_assert_rq_held kernel/sched/sched.h:1609 [inline], CPU#0: syz.3.2858/15137
WARNING: kernel/sched/sched.h:1612 at update_rq_clock+0x40a/0xd20 kernel/sched/core.c:850, CPU#0: syz.3.2858/15137
Modules linked in:
CPU: 0 UID: 0 PID: 15137 Comm: syz.3.2858 Tainted: G     U       L      syzkaller #0 PREEMPT(full) 
Tainted: [U]=USER, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1612 [inline]
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1609 [inline]
RIP: 0010:update_rq_clock+0x40a/0xd20 kernel/sched/core.c:850
Code: ab 88 0b 00 00 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc a8 04 0f 84 df fc ff ff 90 0f 0b 90 e9 d6 fc ff ff 90 <0f> 0b 90 e9 92 fc ff ff 4c 8d 83 80 0b 00 00 48 b8 00 00 00 00 00
RSP: 0018:ffffc90004127738 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff8880b853b380 RCX: 0000000000000001
RDX: 0000000000000046 RSI: ffffffff8def921a RDI: ffffffff8c1c3a00
RBP: ffffc900041278e8 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90d7fb57 R11: 0000000000000000 R12: ffffffff90d82ec4
R13: ffff8880b853c220 R14: ffff88801e681ec0 R15: ffff8880b853b380
FS:  00007fa6d971d6c0(0000) GS:ffff888124374000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b349fbff8 CR3: 0000000025d04000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 pick_next_task kernel/sched/core.c:6222 [inline]
 __schedule+0x1e84/0x67a0 kernel/sched/core.c:7105
 preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7513
 irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:468 [inline]
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x205/0x7e0 kernel/entry/common.c:164
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__sanitizer_cov_trace_pc+0x3f/0x70 kernel/kcov.c:217
Code: 02 12 a9 00 01 ff 00 74 1b f6 c4 01 74 07 a9 00 00 ff 00 74 05 e9 11 80 83 09 8b 82 d4 16 00 00 85 c0 74 f1 8b 82 b0 16 00 00 <83> f8 02 75 e6 48 8b 8a b8 16 00 00 8b 92 b4 16 00 00 48 8b 01 48
RSP: 0018:ffffc90004127a00 EFLAGS: 00000246
RAX: 0000000000000002 RBX: 000000000000722c RCX: ffffffff87fc3553
RDX: ffff8880281bbd80 RSI: ffffffff87fc344d RDI: ffff8880281bbd80
RBP: ffff8880303183b8 R08: 0000000000000004 R09: 000000000000722c
R10: 0000000000008000 R11: 0000000000000000 R12: dffffc0000000000
R13: 000000000000722b R14: 0000000000008000 R15: 1ffff110060630a0
 vb2_get_buffer include/media/videobuf2-core.h:1283 [inline]
 __vb2_queue_free+0x5fd/0xa30 drivers/media/common/videobuf2/videobuf2-core.c:679
 vb2_core_queue_release+0x70/0x190 drivers/media/common/videobuf2/videobuf2-core.c:2679
 vb2_queue_release drivers/media/common/videobuf2/videobuf2-v4l2.c:956 [inline]
 _vb2_fop_release+0xe8/0x280 drivers/media/common/videobuf2/videobuf2-v4l2.c:1159
 vivid_fop_release+0x155/0xc30 drivers/media/test-drivers/vivid/vivid-core.c:667
 v4l2_release+0x1cf/0x390 drivers/media/v4l2-core/v4l2-dev.c:468
 __fput+0x3ff/0xb50 fs/file_table.c:510
 task_work_run+0x150/0x240 kernel/task_work.c:233
 get_signal+0x1b9/0x2210 kernel/signal.c:2809
 arch_do_signal_or_restart+0x91/0x7a0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop+0x8b/0x4f0 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x6f2/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa6d879ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa6d971d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000017
RAX: 0000000000000006 RBX: 00007fa6d8a16090 RCX: 00007fa6d879ce59
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000000000e
RBP: 00007fa6d8832d6f R08: 0000000000000000 R09: 0000000000000000
R10: 00002000000002c0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa6d8a16128 R14: 00007fa6d8a16090 R15: 00007ffd0eef1358
 </TASK>
----------------
Code disassembly (best guess):
   0:	02 12                	add    (%rdx),%dl
   2:	a9 00 01 ff 00       	test   $0xff0100,%eax
   7:	74 1b                	je     0x24
   9:	f6 c4 01             	test   $0x1,%ah
   c:	74 07                	je     0x15
   e:	a9 00 00 ff 00       	test   $0xff0000,%eax
  13:	74 05                	je     0x1a
  15:	e9 11 80 83 09       	jmp    0x983802b
  1a:	8b 82 d4 16 00 00    	mov    0x16d4(%rdx),%eax
  20:	85 c0                	test   %eax,%eax
  22:	74 f1                	je     0x15
  24:	8b 82 b0 16 00 00    	mov    0x16b0(%rdx),%eax
* 2a:	83 f8 02             	cmp    $0x2,%eax <-- trapping instruction
  2d:	75 e6                	jne    0x15
  2f:	48 8b 8a b8 16 00 00 	mov    0x16b8(%rdx),%rcx
  36:	8b 92 b4 16 00 00    	mov    0x16b4(%rdx),%edx
  3c:	48 8b 01             	mov    (%rcx),%rax
  3f:	48                   	rex.W