------------[ cut here ]------------
======================================================
WARNING: possible circular locking dependency detected
6.11.0-rc3-next-20240815-syzkaller #0 Not tainted
------------------------------------------------------
kworker/u8:15/5764 is trying to acquire lock:
ffffffff8e92d780 (console_owner){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:342 [inline]
ffffffff8e92d780 (console_owner){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:267 [inline]
ffffffff8e92d780 (console_owner){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:286 [inline]
ffffffff8e92d780 (console_owner){....}-{0:0}, at: console_flush_all+0x152/0xfd0 kernel/printk/printk.c:3041

but task is already holding lock:
ffff8880b913ea58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:587

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #4 (&rq->__lock){-.-.}-{2:2}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5762
       _raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378
       raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:587
       raw_spin_rq_lock kernel/sched/sched.h:1485 [inline]
       task_rq_lock+0xc6/0x360 kernel/sched/core.c:689
       cgroup_move_task+0x92/0x2d0 kernel/sched/psi.c:1161
       css_set_move_task+0x72e/0x950 kernel/cgroup/cgroup.c:898
       cgroup_post_fork+0x256/0x880 kernel/cgroup/cgroup.c:6690
       copy_process+0x3ab1/0x3e30 kernel/fork.c:2620
       kernel_clone+0x226/0x8f0 kernel/fork.c:2806
       user_mode_thread+0x132/0x1a0 kernel/fork.c:2884
       rest_init+0x23/0x300 init/main.c:712
       start_kernel+0x47a/0x500 init/main.c:1103
       x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:507
       x86_64_start_kernel+0x9f/0xa0 arch/x86/kernel/head64.c:488
       common_startup_64+0x13e/0x147

-> #3 (&p->pi_lock){-.-.}-{2:2}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5762
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
       class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:551 [inline]
       try_to_wake_up+0xb0/0x1470 kernel/sched/core.c:4113
       __wake_up_common kernel/sched/wait.c:89 [inline]
       __wake_up_common_lock+0x130/0x1e0 kernel/sched/wait.c:106
       tty_port_default_wakeup+0xa6/0xf0 drivers/tty/tty_port.c:69
       serial8250_tx_chars+0x6e2/0x930 drivers/tty/serial/8250/8250_port.c:1821
       serial8250_handle_irq+0x558/0x710 drivers/tty/serial/8250/8250_port.c:1929
       serial8250_default_handle_irq+0xd1/0x1f0 drivers/tty/serial/8250/8250_port.c:1949
       serial8250_interrupt+0xa9/0x1f0 drivers/tty/serial/8250/8250_core.c:86
       __handle_irq_event_percpu+0x29a/0xa80 kernel/irq/handle.c:158
       handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
       handle_irq_event+0x89/0x1f0 kernel/irq/handle.c:210
       handle_edge_irq+0x25f/0xc20 kernel/irq/chip.c:831
       generic_handle_irq_desc include/linux/irqdesc.h:173 [inline]
       handle_irq arch/x86/kernel/irq.c:247 [inline]
       call_irq_handler arch/x86/kernel/irq.c:259 [inline]
       __common_interrupt+0x136/0x230 arch/x86/kernel/irq.c:285
       common_interrupt+0xb4/0xd0 arch/x86/kernel/irq.c:278
       asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
       on_stack arch/x86/include/asm/stacktrace.h:58 [inline]
       stack_access_ok arch/x86/kernel/unwind_orc.c:393 [inline]
       deref_stack_reg arch/x86/kernel/unwind_orc.c:403 [inline]
       unwind_next_frame+0xbb7/0x22d0 arch/x86/kernel/unwind_orc.c:585
       __unwind_start+0x59a/0x740 arch/x86/kernel/unwind_orc.c:760
       unwind_start arch/x86/include/asm/unwind.h:64 [inline]
       arch_stack_walk+0xe5/0x150 arch/x86/kernel/stacktrace.c:24
       stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122
       kasan_save_stack mm/kasan/common.c:47 [inline]
       kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
       unpoison_slab_object mm/kasan/common.c:319 [inline]
       __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345
       kasan_slab_alloc include/linux/kasan.h:250 [inline]
       slab_post_alloc_hook mm/slub.c:4032 [inline]
       slab_alloc_node mm/slub.c:4081 [inline]
       kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4088
       lsm_file_alloc security/security.c:678 [inline]
       security_file_alloc+0x28/0x130 security/security.c:2744
       init_file+0x99/0x1e0 fs/file_table.c:153
       alloc_empty_file+0xb8/0x1d0 fs/file_table.c:206
       alloc_file fs/file_table.c:319 [inline]
       alloc_file_pseudo+0x1da/0x290 fs/file_table.c:350
       sock_alloc_file+0xb8/0x290 net/socket.c:469
       sock_map_fd net/socket.c:494 [inline]
       __sys_socket+0x1dd/0x3c0 net/socket.c:1715
       __do_sys_socket net/socket.c:1720 [inline]
       __se_sys_socket net/socket.c:1718 [inline]
       __x64_sys_socket+0x7a/0x90 net/socket.c:1718
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #2 (&tty->write_wait){-.-.}-{2:2}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5762
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
       __wake_up_common_lock+0x25/0x1e0 kernel/sched/wait.c:105
       tty_port_default_wakeup+0xa6/0xf0 drivers/tty/tty_port.c:69
       serial8250_tx_chars+0x6e2/0x930 drivers/tty/serial/8250/8250_port.c:1821
       serial8250_handle_irq+0x558/0x710 drivers/tty/serial/8250/8250_port.c:1929
       serial8250_default_handle_irq+0xd1/0x1f0 drivers/tty/serial/8250/8250_port.c:1949
       serial8250_interrupt+0xa9/0x1f0 drivers/tty/serial/8250/8250_core.c:86
       __handle_irq_event_percpu+0x29a/0xa80 kernel/irq/handle.c:158
       handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
       handle_irq_event+0x89/0x1f0 kernel/irq/handle.c:210
       handle_edge_irq+0x25f/0xc20 kernel/irq/chip.c:831
       generic_handle_irq_desc include/linux/irqdesc.h:173 [inline]
       handle_irq arch/x86/kernel/irq.c:247 [inline]
       call_irq_handler arch/x86/kernel/irq.c:259 [inline]
       __common_interrupt+0x136/0x230 arch/x86/kernel/irq.c:285
       common_interrupt+0xb4/0xd0 arch/x86/kernel/irq.c:278
       asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
       __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
       _raw_spin_unlock_irqrestore+0xd8/0x140 kernel/locking/spinlock.c:194
       spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
       uart_port_unlock_irqrestore include/linux/serial_core.h:669 [inline]
       uart_write+0x15d/0x380 drivers/tty/serial/serial_core.c:636
       process_output_block drivers/tty/n_tty.c:574 [inline]
       n_tty_write+0xd6a/0x1230 drivers/tty/n_tty.c:2389
       iterate_tty_write drivers/tty/tty_io.c:1018 [inline]
       file_tty_write+0x54f/0x9c0 drivers/tty/tty_io.c:1093
       new_sync_write fs/read_write.c:497 [inline]
       vfs_write+0xa72/0xc90 fs/read_write.c:590
       ksys_write+0x183/0x2b0 fs/read_write.c:643
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (&port_lock_key){-.-.}-{2:2}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5762
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
       uart_port_lock_irqsave include/linux/serial_core.h:618 [inline]
       serial8250_console_write+0x1a8/0x1770 drivers/tty/serial/8250/8250_port.c:3352
       console_emit_next_record kernel/printk/printk.c:2983 [inline]
       console_flush_all+0x867/0xfd0 kernel/printk/printk.c:3049
       console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3118
       vprintk_emit+0x5dc/0x7c0 kernel/printk/printk.c:2348
       _printk+0xd5/0x120 kernel/printk/printk.c:2373
       register_console+0x727/0xcf0 kernel/printk/printk.c:3654
       univ8250_console_init+0x52/0x90 drivers/tty/serial/8250/8250_core.c:513
       console_init+0x1b8/0x6f0 kernel/printk/printk.c:3800
       start_kernel+0x2d3/0x500 init/main.c:1038
       x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:507
       x86_64_start_kernel+0x9f/0xa0 arch/x86/kernel/head64.c:488
       common_startup_64+0x13e/0x147

-> #0 (console_owner){....}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3136 [inline]
       check_prevs_add kernel/locking/lockdep.c:3255 [inline]
       validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3871
       __lock_acquire+0x137a/0x2040 kernel/locking/lockdep.c:5145
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5762
       console_lock_spinning_enable kernel/printk/printk.c:1873 [inline]
       console_emit_next_record kernel/printk/printk.c:2977 [inline]
       console_flush_all+0x810/0xfd0 kernel/printk/printk.c:3049
       console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3118
       vprintk_emit+0x5dc/0x7c0 kernel/printk/printk.c:2348
       _printk+0xd5/0x120 kernel/printk/printk.c:2373
       __report_bug lib/bug.c:195 [inline]
       report_bug+0x346/0x500 lib/bug.c:219
       handle_bug+0x60/0x90 arch/x86/kernel/traps.c:285
       exc_invalid_op+0x1a/0x50 arch/x86/kernel/traps.c:309
       asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:621
       lockdep_assert_rq_held kernel/sched/sched.h:1476 [inline]
       rq_clock kernel/sched/sched.h:1624 [inline]
       replenish_dl_new_period kernel/sched/deadline.c:777 [inline]
       update_curr_dl_se+0x66f/0x920 kernel/sched/deadline.c:1511
       update_curr+0x575/0xb20 kernel/sched/fair.c:1176
       put_prev_entity+0x3d/0x210 kernel/sched/fair.c:5505
       put_prev_task_fair+0x4d/0x80 kernel/sched/fair.c:8686
       put_prev_task kernel/sched/sched.h:2423 [inline]
       put_prev_task_balance+0x11d/0x190 kernel/sched/core.c:5886
       __pick_next_task+0xc6/0x2f0 kernel/sched/core.c:5946
       pick_next_task kernel/sched/core.c:6012 [inline]
       __schedule+0x725/0x4ad0 kernel/sched/core.c:6594
       preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6818
       preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6842
       preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12
       __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
       _raw_spin_unlock_irq+0x44/0x50 kernel/locking/spinlock.c:202
       spin_unlock_irq include/linux/spinlock.h:401 [inline]
       call_usermodehelper_exec_async+0x7f/0x380 kernel/umh.c:72
       ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

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 ***

3 locks held by kworker/u8:15/5764:
 #0: ffff8880b913ea58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:587
 #1: ffffffff8e8150a0 (console_lock){+.+.}-{0:0}, at: _printk+0xd5/0x120 kernel/printk/printk.c:2373
 #2: ffffffff8e814cd0 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:342 [inline]
 #2: ffffffff8e814cd0 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:267 [inline]
 #2: ffffffff8e814cd0 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:286 [inline]
 #2: ffffffff8e814cd0 (console_srcu){....}-{0:0}, at: console_flush_all+0x152/0xfd0 kernel/printk/printk.c:3041

stack backtrace:
CPU: 1 UID: 0 PID: 5764 Comm: kworker/u8:15 Not tainted 6.11.0-rc3-next-20240815-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2189
 check_prev_add kernel/locking/lockdep.c:3136 [inline]
 check_prevs_add kernel/locking/lockdep.c:3255 [inline]
 validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3871
 __lock_acquire+0x137a/0x2040 kernel/locking/lockdep.c:5145
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5762
 console_lock_spinning_enable kernel/printk/printk.c:1873 [inline]
 console_emit_next_record kernel/printk/printk.c:2977 [inline]
 console_flush_all+0x810/0xfd0 kernel/printk/printk.c:3049
 console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3118
 vprintk_emit+0x5dc/0x7c0 kernel/printk/printk.c:2348
 _printk+0xd5/0x120 kernel/printk/printk.c:2373
 __report_bug lib/bug.c:195 [inline]
 report_bug+0x346/0x500 lib/bug.c:219
 handle_bug+0x60/0x90 arch/x86/kernel/traps.c:285
 exc_invalid_op+0x1a/0x50 arch/x86/kernel/traps.c:309
 asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:621
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1476 [inline]
RIP: 0010:rq_clock kernel/sched/sched.h:1624 [inline]
RIP: 0010:replenish_dl_new_period kernel/sched/deadline.c:777 [inline]
RIP: 0010:update_curr_dl_se+0x66f/0x920 kernel/sched/deadline.c:1511
Code: b5 50 fe ff ff 4c 89 ff ba 20 00 00 00 e8 e9 4f 00 00 e9 58 fe ff ff 4c 89 ef be 20 00 00 00 e8 b7 13 00 00 e9 46 fe ff ff 90 <0f> 0b 90 e9 be fb ff ff 89 f1 80 e1 07 38 c1 0f 8c b5 f9 ff ff 48
RSP: 0000:ffffc90002f3fa28 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff8880b903ea40 RCX: 0000000000000003
RDX: dffffc0000000000 RSI: ffffffff8c0adfc0 RDI: ffffffff8c609dc0
RBP: 0000000000000031 R08: ffff8880b902c883 R09: 1ffff11017205910
R10: dffffc0000000000 R11: ffffed1017205911 R12: ffff8880b903f468
R13: ffff8880b903f428 R14: 1ffff11017207e8f R15: ffff8880b903f858
 update_curr+0x575/0xb20 kernel/sched/fair.c:1176
 put_prev_entity+0x3d/0x210 kernel/sched/fair.c:5505
 put_prev_task_fair+0x4d/0x80 kernel/sched/fair.c:8686
 put_prev_task kernel/sched/sched.h:2423 [inline]
 put_prev_task_balance+0x11d/0x190 kernel/sched/core.c:5886
 __pick_next_task+0xc6/0x2f0 kernel/sched/core.c:5946
 pick_next_task kernel/sched/core.c:6012 [inline]
 __schedule+0x725/0x4ad0 kernel/sched/core.c:6594
 preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6818
 preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6842
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
 _raw_spin_unlock_irq+0x44/0x50 kernel/locking/spinlock.c:202
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 call_usermodehelper_exec_async+0x7f/0x380 kernel/umh.c:72
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
WARNING: CPU: 1 PID: 5764 at kernel/sched/sched.h:1476 lockdep_assert_rq_held kernel/sched/sched.h:1476 [inline]
WARNING: CPU: 1 PID: 5764 at kernel/sched/sched.h:1476 rq_clock kernel/sched/sched.h:1624 [inline]
WARNING: CPU: 1 PID: 5764 at kernel/sched/sched.h:1476 replenish_dl_new_period kernel/sched/deadline.c:777 [inline]
WARNING: CPU: 1 PID: 5764 at kernel/sched/sched.h:1476 update_curr_dl_se+0x66f/0x920 kernel/sched/deadline.c:1511
Modules linked in:
CPU: 1 UID: 0 PID: 5764 Comm: kworker/u8:15 Not tainted 6.11.0-rc3-next-20240815-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1476 [inline]
RIP: 0010:rq_clock kernel/sched/sched.h:1624 [inline]
RIP: 0010:replenish_dl_new_period kernel/sched/deadline.c:777 [inline]
RIP: 0010:update_curr_dl_se+0x66f/0x920 kernel/sched/deadline.c:1511
Code: b5 50 fe ff ff 4c 89 ff ba 20 00 00 00 e8 e9 4f 00 00 e9 58 fe ff ff 4c 89 ef be 20 00 00 00 e8 b7 13 00 00 e9 46 fe ff ff 90 <0f> 0b 90 e9 be fb ff ff 89 f1 80 e1 07 38 c1 0f 8c b5 f9 ff ff 48
RSP: 0000:ffffc90002f3fa28 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff8880b903ea40 RCX: 0000000000000003
RDX: dffffc0000000000 RSI: ffffffff8c0adfc0 RDI: ffffffff8c609dc0
RBP: 0000000000000031 R08: ffff8880b902c883 R09: 1ffff11017205910
R10: dffffc0000000000 R11: ffffed1017205911 R12: ffff8880b903f468
R13: ffff8880b903f428 R14: 1ffff11017207e8f R15: ffff8880b903f858
FS:  0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff5902f5d30 CR3: 000000007ebec000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 update_curr+0x575/0xb20 kernel/sched/fair.c:1176
 put_prev_entity+0x3d/0x210 kernel/sched/fair.c:5505
 put_prev_task_fair+0x4d/0x80 kernel/sched/fair.c:8686
 put_prev_task kernel/sched/sched.h:2423 [inline]
 put_prev_task_balance+0x11d/0x190 kernel/sched/core.c:5886
 __pick_next_task+0xc6/0x2f0 kernel/sched/core.c:5946
 pick_next_task kernel/sched/core.c:6012 [inline]
 __schedule+0x725/0x4ad0 kernel/sched/core.c:6594
 preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6818
 preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6842
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
 _raw_spin_unlock_irq+0x44/0x50 kernel/locking/spinlock.c:202
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 call_usermodehelper_exec_async+0x7f/0x380 kernel/umh.c:72
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>