FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 1
======================================================
WARNING: possible circular locking dependency detected
6.13.0-rc3-syzkaller-g9fe17b7466f6 #0 Not tainted
------------------------------------------------------
syz.0.342/7409 is trying to acquire lock:
ffffffff8e813440 (console_owner){-...}-{0:0}, at: console_trylock_spinning kernel/printk/printk.c:2048 [inline]
ffffffff8e813440 (console_owner){-...}-{0:0}, at: vprintk_emit+0x530/0xa10 kernel/printk/printk.c:2431

but task is already holding lock:
ffff8880b862a718 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x112/0x240 kernel/time/timer.c:1050

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #4 (&base->lock){-.-.}-{2:2}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
       __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:1050
       __mod_timer+0x1ca/0xeb0 kernel/time/timer.c:1131
       worker_enter_idle+0x31d/0x4d0 kernel/workqueue.c:1050
       worker_thread+0x9c4/0xd30 kernel/workqueue.c:3403
       kthread+0x2f0/0x390 kernel/kthread.c:389
       ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

-> #3 (&pool->lock){-.-.}-{2:2}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
       __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
       _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
       __queue_work+0x759/0xf50
       queue_work_on+0x1c2/0x380 kernel/workqueue.c:2390
       queue_work include/linux/workqueue.h:662 [inline]
       rpm_suspend+0xe70/0x1730 drivers/base/power/runtime.c:662
       __pm_runtime_idle+0x131/0x1a0 drivers/base/power/runtime.c:1104
       pm_runtime_put include/linux/pm_runtime.h:448 [inline]
       __device_attach+0x3e5/0x520 drivers/base/dd.c:1048
       bus_probe_device+0x189/0x260 drivers/base/bus.c:534
       device_add+0x856/0xbf0 drivers/base/core.c:3665
       serial_base_port_add+0x2b6/0x3f0 drivers/tty/serial/serial_base_bus.c:179
       serial_core_port_device_add drivers/tty/serial/serial_core.c:3370 [inline]
       serial_core_register_port+0x377/0x2870 drivers/tty/serial/serial_core.c:3411
       serial8250_register_8250_port+0x1545/0x1ec0 drivers/tty/serial/8250/8250_core.c:820
       serial_pnp_probe+0x4f9/0x9d0 drivers/tty/serial/8250/8250_pnp.c:490
       pnp_device_probe+0x2ba/0x460 drivers/pnp/driver.c:111
       really_probe+0x2b8/0xad0 drivers/base/dd.c:658
       __driver_probe_device+0x1a2/0x390 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:370
       bus_add_driver+0x346/0x670 drivers/base/bus.c:675
       driver_register+0x23a/0x320 drivers/base/driver.c:246
       serial8250_init+0xc1/0x1c0 drivers/tty/serial/8250/8250_platform.c:324
       do_one_initcall+0x248/0x870 init/main.c:1266
       do_initcall_level+0x157/0x210 init/main.c:1328
       do_initcalls+0x3f/0x80 init/main.c:1344
       kernel_init_freeable+0x435/0x5d0 init/main.c:1577
       kernel_init+0x1d/0x2b0 init/main.c:1466
       ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

-> #2 (&dev->power.lock){-.-.}-{3:3}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
       __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:1171
       pm_runtime_get include/linux/pm_runtime.h:396 [inline]
       __uart_start+0x17c/0x450 drivers/tty/serial/serial_core.c:148
       uart_write+0x280/0xa40 drivers/tty/serial/serial_core.c:635
       process_output_block drivers/tty/n_tty.c:574 [inline]
       n_tty_write+0xd62/0x1230 drivers/tty/n_tty.c:2389
       iterate_tty_write drivers/tty/tty_io.c:1015 [inline]
       file_tty_write+0x546/0x9b0 drivers/tty/tty_io.c:1090
       new_sync_write fs/read_write.c:586 [inline]
       vfs_write+0xaeb/0xd30 fs/read_write.c:679
       ksys_write+0x18f/0x2b0 fs/read_write.c:731
       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){-.-.}-{3:3}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
       __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:715 [inline]
       serial8250_console_write+0x1a7/0x1ed0 drivers/tty/serial/8250/8250_port.c:3372
       console_emit_next_record kernel/printk/printk.c:3122 [inline]
       console_flush_all+0x86b/0xeb0 kernel/printk/printk.c:3210
       __console_flush_and_unlock kernel/printk/printk.c:3269 [inline]
       console_unlock+0x14f/0x3b0 kernel/printk/printk.c:3309
       vprintk_emit+0x730/0xa10 kernel/printk/printk.c:2432
       _printk+0xd5/0x120 kernel/printk/printk.c:2457
       register_console+0xbf5/0xfd0 kernel/printk/printk.c:4099
       univ8250_console_init+0x52/0x90 drivers/tty/serial/8250/8250_core.c:513
       console_init+0x1b8/0x6f0 kernel/printk/printk.c:4292
       start_kernel+0x2d8/0x500 init/main.c:1037
       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:3161 [inline]
       check_prevs_add kernel/locking/lockdep.c:3280 [inline]
       validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
       __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
       console_trylock_spinning kernel/printk/printk.c:2048 [inline]
       vprintk_emit+0x54d/0xa10 kernel/printk/printk.c:2431
       _printk+0xd5/0x120 kernel/printk/printk.c:2457
       fail_dump lib/fault-inject.c:46 [inline]
       should_fail_ex+0x391/0x4e0 lib/fault-inject.c:154
       strncpy_from_user+0x36/0x270 lib/strncpy_from_user.c:118
       strncpy_from_user_nofault+0x71/0x140 mm/maccess.c:193
       bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:215 [inline]
       ____bpf_probe_read_compat_str kernel/trace/bpf_trace.c:310 [inline]
       bpf_probe_read_compat_str+0xe9/0x180 kernel/trace/bpf_trace.c:306
       bpf_prog_fda696b15c67ffcf+0x49/0x50
       bpf_dispatcher_nop_func include/linux/bpf.h:1290 [inline]
       __bpf_prog_run include/linux/filter.h:701 [inline]
       bpf_prog_run include/linux/filter.h:708 [inline]
       __bpf_trace_run kernel/trace/bpf_trace.c:2370 [inline]
       bpf_trace_run2+0x2ec/0x540 kernel/trace/bpf_trace.c:2411
       trace_timer_start include/trace/events/timer.h:52 [inline]
       enqueue_timer+0x3ce/0x570 kernel/time/timer.c:662
       internal_add_timer kernel/time/timer.c:687 [inline]
       __mod_timer+0xa0e/0xeb0 kernel/time/timer.c:1182
       sk_reset_timer+0x23/0xc0 net/core/sock.c:3519
       tipc_sk_finish_conn+0x16b/0x820 net/tipc/socket.c:1671
       tipc_socketpair+0x25c/0x4b0 net/tipc/socket.c:3347
       __sys_socketpair+0x40f/0x720 net/socket.c:1780
       __do_sys_socketpair net/socket.c:1816 [inline]
       __se_sys_socketpair net/socket.c:1813 [inline]
       __x64_sys_socketpair+0x9b/0xb0 net/socket.c:1813
       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

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 ***

2 locks held by syz.0.342/7409:
 #0: ffff8880b862a718 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x112/0x240 kernel/time/timer.c:1050
 #1: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #1: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #1: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2369 [inline]
 #1: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: bpf_trace_run2+0x1fc/0x540 kernel/trace/bpf_trace.c:2411

stack backtrace:
CPU: 0 UID: 0 PID: 7409 Comm: syz.0.342 Not tainted 6.13.0-rc3-syzkaller-g9fe17b7466f6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074
 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206
 check_prev_add kernel/locking/lockdep.c:3161 [inline]
 check_prevs_add kernel/locking/lockdep.c:3280 [inline]
 validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
 console_trylock_spinning kernel/printk/printk.c:2048 [inline]
 vprintk_emit+0x54d/0xa10 kernel/printk/printk.c:2431
 _printk+0xd5/0x120 kernel/printk/printk.c:2457
 fail_dump lib/fault-inject.c:46 [inline]
 should_fail_ex+0x391/0x4e0 lib/fault-inject.c:154
 strncpy_from_user+0x36/0x270 lib/strncpy_from_user.c:118
 strncpy_from_user_nofault+0x71/0x140 mm/maccess.c:193
 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:215 [inline]
 ____bpf_probe_read_compat_str kernel/trace/bpf_trace.c:310 [inline]
 bpf_probe_read_compat_str+0xe9/0x180 kernel/trace/bpf_trace.c:306
 bpf_prog_fda696b15c67ffcf+0x49/0x50
 bpf_dispatcher_nop_func include/linux/bpf.h:1290 [inline]
 __bpf_prog_run include/linux/filter.h:701 [inline]
 bpf_prog_run include/linux/filter.h:708 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2370 [inline]
 bpf_trace_run2+0x2ec/0x540 kernel/trace/bpf_trace.c:2411
 trace_timer_start include/trace/events/timer.h:52 [inline]
 enqueue_timer+0x3ce/0x570 kernel/time/timer.c:662
 internal_add_timer kernel/time/timer.c:687 [inline]
 __mod_timer+0xa0e/0xeb0 kernel/time/timer.c:1182
 sk_reset_timer+0x23/0xc0 net/core/sock.c:3519
 tipc_sk_finish_conn+0x16b/0x820 net/tipc/socket.c:1671
 tipc_socketpair+0x25c/0x4b0 net/tipc/socket.c:3347
 __sys_socketpair+0x40f/0x720 net/socket.c:1780
 __do_sys_socketpair net/socket.c:1816 [inline]
 __se_sys_socketpair net/socket.c:1813 [inline]
 __x64_sys_socketpair+0x9b/0xb0 net/socket.c:1813
 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
RIP: 0033:0x7f927c985d29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f927d796038 EFLAGS: 00000246 ORIG_RAX: 0000000000000035
RAX: ffffffffffffffda RBX: 00007f927cb76080 RCX: 00007f927c985d29
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 000000000000001e
RBP: 00007f927d796090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000080 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007f927cb76080 R15: 00007ffffbb8a3f8
 </TASK>
CPU: 0 UID: 0 PID: 7409 Comm: syz.0.342 Not tainted 6.13.0-rc3-syzkaller-g9fe17b7466f6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 fail_dump lib/fault-inject.c:53 [inline]
 should_fail_ex+0x3b0/0x4e0 lib/fault-inject.c:154
 strncpy_from_user+0x36/0x270 lib/strncpy_from_user.c:118
 strncpy_from_user_nofault+0x71/0x140 mm/maccess.c:193
 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:215 [inline]
 ____bpf_probe_read_compat_str kernel/trace/bpf_trace.c:310 [inline]
 bpf_probe_read_compat_str+0xe9/0x180 kernel/trace/bpf_trace.c:306
 bpf_prog_fda696b15c67ffcf+0x49/0x50
 bpf_dispatcher_nop_func include/linux/bpf.h:1290 [inline]
 __bpf_prog_run include/linux/filter.h:701 [inline]
 bpf_prog_run include/linux/filter.h:708 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2370 [inline]
 bpf_trace_run2+0x2ec/0x540 kernel/trace/bpf_trace.c:2411
 trace_timer_start include/trace/events/timer.h:52 [inline]
 enqueue_timer+0x3ce/0x570 kernel/time/timer.c:662
 internal_add_timer kernel/time/timer.c:687 [inline]
 __mod_timer+0xa0e/0xeb0 kernel/time/timer.c:1182
 sk_reset_timer+0x23/0xc0 net/core/sock.c:3519
 tipc_sk_finish_conn+0x16b/0x820 net/tipc/socket.c:1671
 tipc_socketpair+0x25c/0x4b0 net/tipc/socket.c:3347
 __sys_socketpair+0x40f/0x720 net/socket.c:1780
 __do_sys_socketpair net/socket.c:1816 [inline]
 __se_sys_socketpair net/socket.c:1813 [inline]
 __x64_sys_socketpair+0x9b/0xb0 net/socket.c:1813
 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
RIP: 0033:0x7f927c985d29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f927d796038 EFLAGS: 00000246 ORIG_RAX: 0000000000000035
RAX: ffffffffffffffda RBX: 00007f927cb76080 RCX: 00007f927c985d29
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 000000000000001e
RBP: 00007f927d796090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000080 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007f927cb76080 R15: 00007ffffbb8a3f8
 </TASK>