------------[ 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: __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 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: 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