------------[ cut here ]------------
======================================================
WARNING: possible circular locking dependency detected
6.9.0-rc1-syzkaller-00061-g8d025e2092e2 #0 Not tainted
------------------------------------------------------
swapper/2/0 is trying to acquire lock:
ffffffff8dabe960 (console_owner){....}-{0:0}, at: console_trylock_spinning kernel/printk/printk.c:1997 [inline]
ffffffff8dabe960 (console_owner){....}-{0:0}, at: vprintk_emit kernel/printk/printk.c:2347 [inline]
ffffffff8dabe960 (console_owner){....}-{0:0}, at: vprintk_emit+0x42d/0x5a0 kernel/printk/printk.c:2303

but task is already holding lock:
ffff88806b23ea58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:559

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:378
       raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:559
       raw_spin_rq_lock kernel/sched/sched.h:1385 [inline]
       rq_lock kernel/sched/sched.h:1699 [inline]
       task_fork_fair+0x70/0x240 kernel/sched/fair.c:12635
       sched_cgroup_fork+0x3cf/0x510 kernel/sched/core.c:4845
       copy_process+0x4106/0x9160 kernel/fork.c:2498
       kernel_clone+0xfd/0x980 kernel/fork.c:2796
       user_mode_thread+0xb4/0xf0 kernel/fork.c:2874
       rest_init+0x23/0x2b0 init/main.c:697
       start_kernel+0x3a3/0x490 init/main.c:1074
       x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:507
       x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:488
       common_startup_64+0x13e/0x148

-> #3 (&p->pi_lock){-.-.}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
       class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:553 [inline]
       try_to_wake_up+0x9a/0x13e0 kernel/sched/core.c:4262
       __wake_up_common+0x131/0x1e0 kernel/sched/wait.c:89
       __wake_up_common_lock kernel/sched/wait.c:106 [inline]
       __wake_up+0x31/0x60 kernel/sched/wait.c:127
       tty_port_default_wakeup+0x2a/0x40 drivers/tty/tty_port.c:69
       serial8250_tx_chars+0x55a/0x8b0 drivers/tty/serial/8250/8250_port.c:1825
       serial8250_handle_irq+0x5d3/0x780 drivers/tty/serial/8250/8250_port.c:1932
       serial8250_default_handle_irq+0x9a/0x210 drivers/tty/serial/8250/8250_port.c:1952
       serial8250_interrupt+0x103/0x210 drivers/tty/serial/8250/8250_core.c:127
       __handle_irq_event_percpu+0x229/0x7c0 kernel/irq/handle.c:158
       handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
       handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:210
       handle_edge_irq+0x263/0xd10 kernel/irq/chip.c:831
       generic_handle_irq_desc include/linux/irqdesc.h:161 [inline]
       handle_irq arch/x86/kernel/irq.c:238 [inline]
       __common_interrupt+0xde/0x250 arch/x86/kernel/irq.c:257
       common_interrupt+0xab/0xd0 arch/x86/kernel/irq.c:247
       asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
       native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
       arch_safe_halt arch/x86/include/asm/irqflags.h:86 [inline]
       default_idle+0xf/0x20 arch/x86/kernel/process.c:742
       default_idle_call+0x6d/0xb0 kernel/sched/idle.c:117
       cpuidle_idle_call kernel/sched/idle.c:191 [inline]
       do_idle+0x32c/0x3f0 kernel/sched/idle.c:332
       cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:430
       rest_init+0x16b/0x2b0 init/main.c:732
       start_kernel+0x3a3/0x490 init/main.c:1074
       x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:507
       x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:488
       common_startup_64+0x13e/0x148

-> #2 (&tty->write_wait){-.-.}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
       __wake_up_common_lock kernel/sched/wait.c:105 [inline]
       __wake_up+0x1c/0x60 kernel/sched/wait.c:127
       tty_port_default_wakeup+0x2a/0x40 drivers/tty/tty_port.c:69
       serial8250_tx_chars+0x55a/0x8b0 drivers/tty/serial/8250/8250_port.c:1825
       serial8250_handle_irq+0x5d3/0x780 drivers/tty/serial/8250/8250_port.c:1932
       serial8250_default_handle_irq+0x9a/0x210 drivers/tty/serial/8250/8250_port.c:1952
       serial8250_interrupt+0x103/0x210 drivers/tty/serial/8250/8250_core.c:127
       __handle_irq_event_percpu+0x229/0x7c0 kernel/irq/handle.c:158
       handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
       handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:210
       handle_edge_irq+0x263/0xd10 kernel/irq/chip.c:831
       generic_handle_irq_desc include/linux/irqdesc.h:161 [inline]
       handle_irq arch/x86/kernel/irq.c:238 [inline]
       __common_interrupt+0xde/0x250 arch/x86/kernel/irq.c:257
       common_interrupt+0xab/0xd0 arch/x86/kernel/irq.c:247
       asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
       native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
       arch_safe_halt arch/x86/include/asm/irqflags.h:86 [inline]
       default_idle+0xf/0x20 arch/x86/kernel/process.c:742
       default_idle_call+0x6d/0xb0 kernel/sched/idle.c:117
       cpuidle_idle_call kernel/sched/idle.c:191 [inline]
       do_idle+0x32c/0x3f0 kernel/sched/idle.c:332
       cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:430
       rest_init+0x16b/0x2b0 init/main.c:732
       start_kernel+0x3a3/0x490 init/main.c:1074
       x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:507
       x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:488
       common_startup_64+0x13e/0x148

-> #1 (&port_lock_key){-.-.}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
       uart_port_lock_irqsave include/linux/serial_core.h:619 [inline]
       serial8250_console_write+0xaa6/0x1090 drivers/tty/serial/8250/8250_port.c:3355
       console_emit_next_record kernel/printk/printk.c:2913 [inline]
       console_flush_all+0x53f/0xd70 kernel/printk/printk.c:2979
       console_unlock+0xae/0x290 kernel/printk/printk.c:3048
       vprintk_emit kernel/printk/printk.c:2348 [inline]
       vprintk_emit+0x11a/0x5a0 kernel/printk/printk.c:2303
       vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:45
       _printk+0xc8/0x100 kernel/printk/printk.c:2373
       register_console+0xaa2/0x10a0 kernel/printk/printk.c:3569
       univ8250_console_init+0x35/0x50 drivers/tty/serial/8250/8250_core.c:717
       console_init+0xcc/0x680 kernel/printk/printk.c:3715
       start_kernel+0x259/0x490 init/main.c:1009
       x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:507
       x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:488
       common_startup_64+0x13e/0x148

-> #0 (console_owner){....}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3134 [inline]
       check_prevs_add kernel/locking/lockdep.c:3253 [inline]
       validate_chain kernel/locking/lockdep.c:3869 [inline]
       __lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137
       lock_acquire kernel/locking/lockdep.c:5754 [inline]
       lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
       console_trylock_spinning kernel/printk/printk.c:1997 [inline]
       vprintk_emit kernel/printk/printk.c:2347 [inline]
       vprintk_emit+0x442/0x5a0 kernel/printk/printk.c:2303
       vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:45
       _printk+0xc8/0x100 kernel/printk/printk.c:2373
       __report_bug lib/bug.c:195 [inline]
       report_bug+0x4ac/0x580 lib/bug.c:219
       handle_bug+0x3d/0x70 arch/x86/kernel/traps.c:239
       exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:260
       asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:621
       __local_bh_enable_ip+0xc3/0x120 kernel/softirq.c:362
       spin_unlock_bh include/linux/spinlock.h:396 [inline]
       sock_hash_delete_elem+0x1f4/0x260 net/core/sock_map.c:947
       ___bpf_prog_run+0x3e51/0xae80 kernel/bpf/core.c:1997
       __bpf_prog_run32+0xc1/0x100 kernel/bpf/core.c:2236
       bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]
       __bpf_prog_run include/linux/filter.h:657 [inline]
       bpf_prog_run include/linux/filter.h:664 [inline]
       __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline]
       bpf_trace_run4+0x176/0x460 kernel/trace/bpf_trace.c:2422
       __bpf_trace_sched_switch+0x13e/0x190 include/trace/events/sched.h:222
       trace_sched_switch include/trace/events/sched.h:222 [inline]
       __schedule+0x252c/0x5d00 kernel/sched/core.c:6743
       schedule_idle+0x59/0x90 kernel/sched/core.c:6864
       do_idle+0x287/0x3f0 kernel/sched/idle.c:360
       cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:430
       start_secondary+0x220/0x2b0 arch/x86/kernel/smpboot.c:313
       common_startup_64+0x13e/0x148

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 ***

2 locks held by swapper/2/0:
 #0: ffff88806b23ea58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:559
 #1: ffffffff8dbb14a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
 #1: ffffffff8dbb14a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline]
 #1: ffffffff8dbb14a0 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2380 [inline]
 #1: ffffffff8dbb14a0 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run4+0x107/0x460 kernel/trace/bpf_trace.c:2422

stack backtrace:
CPU: 2 PID: 0 Comm: swapper/2 Not tainted 6.9.0-rc1-syzkaller-00061-g8d025e2092e2 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
 check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2187
 check_prev_add kernel/locking/lockdep.c:3134 [inline]
 check_prevs_add kernel/locking/lockdep.c:3253 [inline]
 validate_chain kernel/locking/lockdep.c:3869 [inline]
 __lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137
 lock_acquire kernel/locking/lockdep.c:5754 [inline]
 lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
 console_trylock_spinning kernel/printk/printk.c:1997 [inline]
 vprintk_emit kernel/printk/printk.c:2347 [inline]
 vprintk_emit+0x442/0x5a0 kernel/printk/printk.c:2303
 vprintk+0x7f/0xa0 kernel/printk/printk_safe.c:45
 _printk+0xc8/0x100 kernel/printk/printk.c:2373
 __report_bug lib/bug.c:195 [inline]
 report_bug+0x4ac/0x580 lib/bug.c:219
 handle_bug+0x3d/0x70 arch/x86/kernel/traps.c:239
 exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:260
 asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:621
RIP: 0010:__local_bh_enable_ip+0xc3/0x120 kernel/softirq.c:362
Code: 00 e8 61 6f 0b 00 e8 0c b7 42 00 fb 65 8b 05 fc 02 b2 7e 85 c0 74 52 5b 5d c3 cc cc cc cc 65 8b 05 be b3 b0 7e 85 c0 75 9e 90 <0f> 0b 90 eb 98 e8 13 b5 42 00 eb 99 48 89 ef e8 a9 f4 19 00 eb a2
RSP: 0018:ffffc900001878e0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000000201 RCX: 1ffffffff1fc29bb
RDX: 0000000000000000 RSI: 0000000000000201 RDI: ffffffff88d45ce4
RBP: ffffffff88d45ce4 R08: 0000000000000000 R09: ffffed1005eb2b1c
R10: ffff88802f5958e3 R11: ffffffff938dc068 R12: fffffffffffffffe
R13: ffff88802f5958e0 R14: ffff88802f5958d8 R15: 0000000023700e53
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 sock_hash_delete_elem+0x1f4/0x260 net/core/sock_map.c:947
 ___bpf_prog_run+0x3e51/0xae80 kernel/bpf/core.c:1997
 __bpf_prog_run32+0xc1/0x100 kernel/bpf/core.c:2236
 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]
 __bpf_prog_run include/linux/filter.h:657 [inline]
 bpf_prog_run include/linux/filter.h:664 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline]
 bpf_trace_run4+0x176/0x460 kernel/trace/bpf_trace.c:2422
 __bpf_trace_sched_switch+0x13e/0x190 include/trace/events/sched.h:222
 trace_sched_switch include/trace/events/sched.h:222 [inline]
 __schedule+0x252c/0x5d00 kernel/sched/core.c:6743
 schedule_idle+0x59/0x90 kernel/sched/core.c:6864
 do_idle+0x287/0x3f0 kernel/sched/idle.c:360
 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:430
 start_secondary+0x220/0x2b0 arch/x86/kernel/smpboot.c:313
 common_startup_64+0x13e/0x148
 </TASK>
------------[ cut here ]------------
WARNING: CPU: 1 PID: 0 at arch/x86/mm/tlb.c:515 switch_mm_irqs_off+0x890/0xbc0 arch/x86/mm/tlb.c:515
Modules linked in:
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.9.0-rc1-syzkaller-00061-g8d025e2092e2 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:switch_mm_irqs_off+0x890/0xbc0 arch/x86/mm/tlb.c:515
Code: ff 44 8d 6b 02 48 63 d3 49 8d 8e 18 06 00 00 4d 63 ed 49 c1 e5 04 4d 8d 8d 80 d8 03 00 49 81 c5 88 d8 03 00 e9 75 fd ff ff 90 <0f> 0b 90 e9 e3 f7 ff ff 90 0f 0b 90 e8 df f5 ff ff e9 20 f8 ff ff
RSP: 0018:ffffc90000177be8 EFLAGS: 00010202
RAX: 0000000000000282 RBX: ffff888017ee0000 RCX: ffff888024cfaf80
RDX: 1ffff1100499f6ca RSI: ffffffff8b8f46e0 RDI: ffffffff8b8f4720
RBP: ffff888024cfaf80 R08: 0000000000000001 R09: ffffed1002fdc734
R10: ffff888017ee39a7 R11: 0000000000000000 R12: ffff88806b13f501
R13: ffff88802ca44880 R14: ffff888024cfaf80 R15: ffff88806b13ea40
FS:  0000000000000000(0000) GS:ffff88806b100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056328857a9d8 CR3: 000000002c02e000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5393 [inline]
 __schedule+0xd2b/0x5d00 kernel/sched/core.c:6746
 schedule_idle+0x59/0x90 kernel/sched/core.c:6864
 do_idle+0x287/0x3f0 kernel/sched/idle.c:360
 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:430
 start_secondary+0x220/0x2b0 arch/x86/kernel/smpboot.c:313
 common_startup_64+0x13e/0x148
 </TASK>