------------[ cut here ]------------
======================================================
WARNING: possible circular locking dependency detected
6.8.0-syzkaller-05236-g443574b03387 #0 Not tainted
------------------------------------------------------
sshd/5065 is trying to acquire lock:
ffffffff8e125be0 (console_owner){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:303 [inline]
ffffffff8e125be0 (console_owner){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:232 [inline]
ffffffff8e125be0 (console_owner){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:286 [inline]
ffffffff8e125be0 (console_owner){....}-{0:0}, at: console_flush_all+0x14a/0xec0 kernel/printk/printk.c:2948

but task is already holding lock:
ffff8880b942a758 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x112/0x240 kernel/time/timer.c:1051

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #4 (&base->lock){-.-.}-{2:2}:
       lock_acquire+0x1e4/0x530 kernel/locking/lockdep.c:5754
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
       lock_timer_base+0x112/0x240 kernel/time/timer.c:1051
       __mod_timer+0x1ca/0xeb0 kernel/time/timer.c:1132
       worker_enter_idle+0x31d/0x4d0 kernel/workqueue.c:1059
       worker_thread+0x9c0/0xd70 kernel/workqueue.c:3428
       kthread+0x2f0/0x390 kernel/kthread.c:388
       ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243

-> #3 (&pool->lock){-.-.}-{2:2}:
       lock_acquire+0x1e4/0x530 kernel/locking/lockdep.c:5754
       __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
       _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
       __queue_work+0x6ec/0xec0
       queue_work_on+0x14f/0x250 kernel/workqueue.c:2435
       queue_work include/linux/workqueue.h:605 [inline]
       rpm_suspend+0x11bd/0x1c10 drivers/base/power/runtime.c:661
       __pm_runtime_idle+0x131/0x1a0 drivers/base/power/runtime.c:1103
       pm_runtime_put include/linux/pm_runtime.h:460 [inline]
       __device_attach+0x3e5/0x520 drivers/base/dd.c:1048
       bus_probe_device+0x189/0x260 drivers/base/bus.c:532
       device_add+0x8ff/0xca0 drivers/base/core.c:3639
       serial_base_port_add+0x2b6/0x3f0 drivers/tty/serial/serial_base_bus.c:178
       serial_core_port_device_add drivers/tty/serial/serial_core.c:3353 [inline]
       serial_core_register_port+0x393/0x1e30 drivers/tty/serial/serial_core.c:3394
       serial8250_register_8250_port+0x1433/0x1cd0 drivers/tty/serial/8250/8250_core.c:1138
       serial_pnp_probe+0x7d5/0xa20 drivers/tty/serial/8250/8250_pnp.c:478
       pnp_device_probe+0x2ba/0x460 drivers/pnp/driver.c:111
       really_probe+0x29e/0xc50 drivers/base/dd.c:658
       __driver_probe_device+0x1a2/0x3e0 drivers/base/dd.c:800
       driver_probe_device+0x50/0x430 drivers/base/dd.c:830
       __driver_attach+0x45f/0x710 drivers/base/dd.c:1216
       bus_for_each_dev+0x239/0x2b0 drivers/base/bus.c:368
       bus_add_driver+0x347/0x620 drivers/base/bus.c:673
       driver_register+0x23a/0x320 drivers/base/driver.c:246
       serial8250_init+0x9e/0x170 drivers/tty/serial/8250/8250_core.c:1239
       do_one_initcall+0x238/0x830 init/main.c:1241
       do_initcall_level+0x157/0x210 init/main.c:1303
       do_initcalls+0x3f/0x80 init/main.c:1319
       kernel_init_freeable+0x435/0x5d0 init/main.c:1557
       kernel_init+0x1d/0x2a0 init/main.c:1446
       ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243

-> #2 (&dev->power.lock){-...}-{2:2}:
       lock_acquire+0x1e4/0x530 kernel/locking/lockdep.c:5754
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
       __pm_runtime_resume+0x112/0x180 drivers/base/power/runtime.c:1170
       pm_runtime_get include/linux/pm_runtime.h:408 [inline]
       __uart_start+0x17a/0x3c0 drivers/tty/serial/serial_core.c:148
       uart_write+0x427/0x5c0 drivers/tty/serial/serial_core.c:615
       process_output_block drivers/tty/n_tty.c:574 [inline]
       n_tty_write+0xd6a/0x1230 drivers/tty/n_tty.c:2379
       iterate_tty_write drivers/tty/tty_io.c:1021 [inline]
       file_tty_write+0x54f/0x9b0 drivers/tty/tty_io.c:1096
       call_write_iter include/linux/fs.h:2108 [inline]
       new_sync_write fs/read_write.c:497 [inline]
       vfs_write+0xa84/0xcb0 fs/read_write.c:590
       ksys_write+0x1a0/0x2c0 fs/read_write.c:643
       do_syscall_64+0xfb/0x240
       entry_SYSCALL_64_after_hwframe+0x6d/0x75

-> #1 (&port_lock_key){-.-.}-{2:2}:
       lock_acquire+0x1e4/0x530 kernel/locking/lockdep.c:5754
       __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:616 [inline]
       serial8250_console_write+0x1a8/0x1840 drivers/tty/serial/8250/8250_port.c:3403
       console_emit_next_record kernel/printk/printk.c:2890 [inline]
       console_flush_all+0x80b/0xec0 kernel/printk/printk.c:2956
       console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3025
       vprintk_emit+0x509/0x720 kernel/printk/printk.c:2292
       _printk+0xd5/0x120 kernel/printk/printk.c:2317
       register_console+0x70a/0xcd0 kernel/printk/printk.c:3531
       univ8250_console_init+0x49/0x50 drivers/tty/serial/8250/8250_core.c:717
       console_init+0x198/0x680 kernel/printk/printk.c:3677
       start_kernel+0x2d3/0x500 init/main.c:1012
       x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:509
       x86_64_start_kernel+0x99/0xa0 arch/x86/kernel/head64.c:490
       common_startup_64+0x13e/0x147

-> #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+0x18cb/0x58e0 kernel/locking/lockdep.c:3869
       __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137
       lock_acquire+0x1e4/0x530 kernel/locking/lockdep.c:5754
       console_lock_spinning_enable kernel/printk/printk.c:1843 [inline]
       console_emit_next_record kernel/printk/printk.c:2884 [inline]
       console_flush_all+0x7ba/0xec0 kernel/printk/printk.c:2956
       console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3025
       vprintk_emit+0x509/0x720 kernel/printk/printk.c:2292
       _printk+0xd5/0x120 kernel/printk/printk.c:2317
       __report_bug lib/bug.c:195 [inline]
       report_bug+0x346/0x500 lib/bug.c:219
       handle_bug+0x3e/0x70 arch/x86/kernel/traps.c:239
       exc_invalid_op+0x1a/0x50 arch/x86/kernel/traps.c:260
       asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:621
       __local_bh_enable_ip+0x1be/0x200 kernel/softirq.c:362
       spin_unlock_bh include/linux/spinlock.h:396 [inline]
       __sock_map_delete net/core/sock_map.c:424 [inline]
       sock_map_delete_elem+0xca/0x140 net/core/sock_map.c:446
       bpf_prog_8a405b5ced52e191+0x4a/0x4e
       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_run2+0x204/0x420 kernel/trace/bpf_trace.c:2420
       trace_timer_start include/trace/events/timer.h:52 [inline]
       enqueue_timer+0x396/0x550 kernel/time/timer.c:663
       __mod_timer+0x953/0xeb0 kernel/time/timer.c:1181
       sk_reset_timer+0x23/0xc0 net/core/sock.c:3420
       inet_csk_reset_xmit_timer include/net/inet_connection_sock.h:236 [inline]
       tcp_reset_xmit_timer include/net/tcp.h:1421 [inline]
       tcp_schedule_loss_probe+0x419/0x560 net/ipv4/tcp_output.c:2874
       tcp_write_xmit+0x3682/0x6100 net/ipv4/tcp_output.c:2823
       __tcp_push_pending_frames+0x9b/0x360 net/ipv4/tcp_output.c:2977
       tcp_sendmsg_locked+0x42cc/0x4d00 net/ipv4/tcp.c:1310
       tcp_sendmsg+0x30/0x50 net/ipv4/tcp.c:1342
       sock_sendmsg_nosec net/socket.c:730 [inline]
       __sock_sendmsg+0x1a6/0x270 net/socket.c:745
       sock_write_iter+0x2dd/0x400 net/socket.c:1160
       call_write_iter include/linux/fs.h:2108 [inline]
       new_sync_write fs/read_write.c:497 [inline]
       vfs_write+0xa84/0xcb0 fs/read_write.c:590
       ksys_write+0x1a0/0x2c0 fs/read_write.c:643
       do_syscall_64+0xfb/0x240
       entry_SYSCALL_64_after_hwframe+0x6d/0x75

other info that might help us debug this:

Chain exists of:
  console_owner --> &pool->lock --> &base->lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&base->lock);
                               lock(&pool->lock);
                               lock(&base->lock);
  lock(console_owner);

 *** DEADLOCK ***

5 locks held by sshd/5065:
 #0: ffff88802d3eb358 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1671 [inline]
 #0: ffff88802d3eb358 (sk_lock-AF_INET){+.+.}-{0:0}, at: tcp_sendmsg+0x22/0x50 net/ipv4/tcp.c:1341
 #1: ffff8880b942a758 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x112/0x240 kernel/time/timer.c:1051
 #2: ffffffff8e131920 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
 #2: ffffffff8e131920 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
 #2: ffffffff8e131920 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2380 [inline]
 #2: ffffffff8e131920 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x114/0x420 kernel/trace/bpf_trace.c:2420
 #3: ffffffff8e00d500 (console_lock){+.+.}-{0:0}, at: _printk+0xd5/0x120 kernel/printk/printk.c:2317
 #4: ffffffff8e00d130 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:303 [inline]
 #4: ffffffff8e00d130 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:232 [inline]
 #4: ffffffff8e00d130 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:286 [inline]
 #4: ffffffff8e00d130 (console_srcu){....}-{0:0}, at: console_flush_all+0x14a/0xec0 kernel/printk/printk.c:2948

stack backtrace:
CPU: 0 PID: 5065 Comm: sshd Not tainted 6.8.0-syzkaller-05236-g443574b03387 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106
 check_noncircular+0x36a/0x4a0 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+0x18cb/0x58e0 kernel/locking/lockdep.c:3869
 __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137
 lock_acquire+0x1e4/0x530 kernel/locking/lockdep.c:5754
 console_lock_spinning_enable kernel/printk/printk.c:1843 [inline]
 console_emit_next_record kernel/printk/printk.c:2884 [inline]
 console_flush_all+0x7ba/0xec0 kernel/printk/printk.c:2956
 console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3025
 vprintk_emit+0x509/0x720 kernel/printk/printk.c:2292
 _printk+0xd5/0x120 kernel/printk/printk.c:2317
 __report_bug lib/bug.c:195 [inline]
 report_bug+0x346/0x500 lib/bug.c:219
 handle_bug+0x3e/0x70 arch/x86/kernel/traps.c:239
 exc_invalid_op+0x1a/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+0x1be/0x200 kernel/softirq.c:362
Code: 3b 44 24 60 75 52 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc 90 0f 0b 90 e9 ca fe ff ff e8 55 00 00 00 eb 9c 90 <0f> 0b 90 e9 fa fe ff ff 48 c7 c1 9c e1 86 8f 80 e1 07 80 c1 03 38
RSP: 0018:ffffc900039b71e0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 1ffff92000736e40 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000201 RDI: ffffffff895fa99a
RBP: ffffc900039b72a0 R08: ffff888022bbb1eb R09: 1ffff1100457763d
R10: dffffc0000000000 R11: ffffed100457763e R12: dffffc0000000000
R13: ffff88802e5c8740 R14: ffffc900039b7220 R15: 0000000000000201
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 __sock_map_delete net/core/sock_map.c:424 [inline]
 sock_map_delete_elem+0xca/0x140 net/core/sock_map.c:446
 bpf_prog_8a405b5ced52e191+0x4a/0x4e
 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_run2+0x204/0x420 kernel/trace/bpf_trace.c:2420
 trace_timer_start include/trace/events/timer.h:52 [inline]
 enqueue_timer+0x396/0x550 kernel/time/timer.c:663
 __mod_timer+0x953/0xeb0 kernel/time/timer.c:1181
 sk_reset_timer+0x23/0xc0 net/core/sock.c:3420
 inet_csk_reset_xmit_timer include/net/inet_connection_sock.h:236 [inline]
 tcp_reset_xmit_timer include/net/tcp.h:1421 [inline]
 tcp_schedule_loss_probe+0x419/0x560 net/ipv4/tcp_output.c:2874
 tcp_write_xmit+0x3682/0x6100 net/ipv4/tcp_output.c:2823
 __tcp_push_pending_frames+0x9b/0x360 net/ipv4/tcp_output.c:2977
 tcp_sendmsg_locked+0x42cc/0x4d00 net/ipv4/tcp.c:1310
 tcp_sendmsg+0x30/0x50 net/ipv4/tcp.c:1342
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x1a6/0x270 net/socket.c:745
 sock_write_iter+0x2dd/0x400 net/socket.c:1160
 call_write_iter include/linux/fs.h:2108 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0xa84/0xcb0 fs/read_write.c:590
 ksys_write+0x1a0/0x2c0 fs/read_write.c:643
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7fdb7cb16bf2
Code: 89 c7 48 89 44 24 08 e8 7b 34 fa ff 48 8b 44 24 08 48 83 c4 28 c3 c3 64 8b 04 25 18 00 00 00 85 c0 75 20 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 6f 48 8b 15 07 a2 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffc884a63c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000000002c RCX: 00007fdb7cb16bf2
RDX: 000000000000002c RSI: 000055de20155960 RDI: 0000000000000004
RBP: 000055de20163c20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000055de0d2f1aa4
R13: 000000000000004a R14: 000055de0d2f23e8 R15: 00007ffc884a6438
 </TASK>
WARNING: CPU: 0 PID: 5065 at kernel/softirq.c:362 __local_bh_enable_ip+0x1be/0x200 kernel/softirq.c:362
Modules linked in:
CPU: 0 PID: 5065 Comm: sshd Not tainted 6.8.0-syzkaller-05236-g443574b03387 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:__local_bh_enable_ip+0x1be/0x200 kernel/softirq.c:362
Code: 3b 44 24 60 75 52 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc 90 0f 0b 90 e9 ca fe ff ff e8 55 00 00 00 eb 9c 90 <0f> 0b 90 e9 fa fe ff ff 48 c7 c1 9c e1 86 8f 80 e1 07 80 c1 03 38
RSP: 0018:ffffc900039b71e0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 1ffff92000736e40 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000201 RDI: ffffffff895fa99a
RBP: ffffc900039b72a0 R08: ffff888022bbb1eb R09: 1ffff1100457763d
R10: dffffc0000000000 R11: ffffed100457763e R12: dffffc0000000000
R13: ffff88802e5c8740 R14: ffffc900039b7220 R15: 0000000000000201
FS:  00007fdb7ceaf800(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000007a032000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 __sock_map_delete net/core/sock_map.c:424 [inline]
 sock_map_delete_elem+0xca/0x140 net/core/sock_map.c:446
 bpf_prog_8a405b5ced52e191+0x4a/0x4e
 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_run2+0x204/0x420 kernel/trace/bpf_trace.c:2420
 trace_timer_start include/trace/events/timer.h:52 [inline]
 enqueue_timer+0x396/0x550 kernel/time/timer.c:663
 __mod_timer+0x953/0xeb0 kernel/time/timer.c:1181
 sk_reset_timer+0x23/0xc0 net/core/sock.c:3420
 inet_csk_reset_xmit_timer include/net/inet_connection_sock.h:236 [inline]
 tcp_reset_xmit_timer include/net/tcp.h:1421 [inline]
 tcp_schedule_loss_probe+0x419/0x560 net/ipv4/tcp_output.c:2874
 tcp_write_xmit+0x3682/0x6100 net/ipv4/tcp_output.c:2823
 __tcp_push_pending_frames+0x9b/0x360 net/ipv4/tcp_output.c:2977
 tcp_sendmsg_locked+0x42cc/0x4d00 net/ipv4/tcp.c:1310
 tcp_sendmsg+0x30/0x50 net/ipv4/tcp.c:1342
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x1a6/0x270 net/socket.c:745
 sock_write_iter+0x2dd/0x400 net/socket.c:1160
 call_write_iter include/linux/fs.h:2108 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0xa84/0xcb0 fs/read_write.c:590
 ksys_write+0x1a0/0x2c0 fs/read_write.c:643
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7fdb7cb16bf2
Code: 89 c7 48 89 44 24 08 e8 7b 34 fa ff 48 8b 44 24 08 48 83 c4 28 c3 c3 64 8b 04 25 18 00 00 00 85 c0 75 20 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 6f 48 8b 15 07 a2 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffc884a63c8 EFLAGS: 00000246
 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000000002c RCX: 00007fdb7cb16bf2
RDX: 000000000000002c RSI: 000055de20155960 RDI: 0000000000000004
RBP: 000055de20163c20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000055de0d2f1aa4
R13: 000000000000004a R14: 000055de0d2f23e8 R15: 00007ffc884a6438
 </TASK>