ODEBUG: object ffffc90003e37b48 is on stack ffffc90003e34000, but NOT annotated.
======================================================
WARNING: possible circular locking dependency detected
6.15.0-rc4-syzkaller #0 Not tainted
------------------------------------------------------
bch-copygc/loop/4998 is trying to acquire lock:
ffffffff83d83370 (console_owner){....}-{0:0}, at: console_trylock_spinning kernel/printk/printk.c:2048 [inline]
ffffffff83d83370 (console_owner){....}-{0:0}, at: vprintk_emit+0x1b2/0x420 kernel/printk/printk.c:2449
but task is already holding lock:
ffffffff8beedb60 (&obj_hash[i].lock){-.-.}-{2:2}, at: __debug_object_init+0x5e/0x2b0 lib/debugobjects.c:741
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #4 (&obj_hash[i].lock){-.-.}-{2:2}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x5f/0x90 kernel/locking/spinlock.c:162
debug_object_activate+0x6f/0x340 lib/debugobjects.c:818
debug_work_activate kernel/workqueue.c:664 [inline]
insert_work+0x24/0xc0 kernel/workqueue.c:2180
__queue_work+0x47a/0x5d0 kernel/workqueue.c:2341
queue_work_on+0xc0/0x110 kernel/workqueue.c:2392
queue_work include/linux/workqueue.h:662 [inline]
start_poll_synchronize_rcu_expedited+0x99/0xd0 kernel/rcu/tree_exp.h:1075
rcu_init+0xea/0x120 kernel/rcu/tree.c:4846
start_kernel+0x1ac/0x380 init/main.c:990
x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:513
x86_64_start_kernel+0x61/0x70 arch/x86/kernel/head64.c:494
common_startup_64+0x13e/0x147
-> #3 (&pool->lock){-.-.}-{2:2}:
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
__queue_work+0x2b6/0x5d0 kernel/workqueue.c:-1
queue_work_on+0xc0/0x110 kernel/workqueue.c:2392
queue_work include/linux/workqueue.h:662 [inline]
rpm_suspend+0x4ea/0x720 drivers/base/power/runtime.c:673
__pm_runtime_idle+0x68/0xa0 drivers/base/power/runtime.c:1112
pm_runtime_put include/linux/pm_runtime.h:466 [inline]
__device_attach+0x11c/0x1a0 drivers/base/dd.c:1047
bus_probe_device+0x9e/0x120 drivers/base/bus.c:537
device_add+0x253/0x440 drivers/base/core.c:3692
serial_base_port_add+0xde/0x150 drivers/tty/serial/serial_base_bus.c:179
serial_core_port_device_add drivers/tty/serial/serial_core.c:3342 [inline]
serial_core_register_port+0xfd/0x980 drivers/tty/serial/serial_core.c:3381
serial8250_register_8250_port+0x59f/0x6f0 drivers/tty/serial/8250/8250_core.c:822
serial_pnp_probe+0x1cf/0x310 drivers/tty/serial/8250/8250_pnp.c:480
pnp_device_probe+0xcd/0x120 drivers/pnp/driver.c:111
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0xfb/0x3e0 drivers/base/dd.c:657
__driver_probe_device+0x72/0xf0 drivers/base/dd.c:799
driver_probe_device+0x1d/0x1b0 drivers/base/dd.c:829
__driver_attach+0x11b/0x270 drivers/base/dd.c:1215
bus_for_each_dev+0x104/0x150 drivers/base/bus.c:370
bus_add_driver+0x167/0x2b0 drivers/base/bus.c:678
driver_register+0x64/0x110 drivers/base/driver.c:249
serial8250_init+0x6f/0x110 drivers/tty/serial/8250/8250_platform.c:315
do_one_initcall+0x144/0x440 init/main.c:1257
do_initcall_level+0x7d/0xa0 init/main.c:1319
do_initcalls+0x54/0x90 init/main.c:1335
kernel_init_freeable+0x185/0x200 init/main.c:1567
kernel_init+0x15/0x120 init/main.c:1457
ret_from_fork+0x32/0x40 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
-> #2 (&dev->power.lock){-...}-{3:3}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x5f/0x90 kernel/locking/spinlock.c:162
__pm_runtime_resume+0x4a/0x80 drivers/base/power/runtime.c:1179
pm_runtime_get include/linux/pm_runtime.h:414 [inline]
__uart_start+0x53/0xe0 drivers/tty/serial/serial_core.c:148
uart_write+0xca/0x2a0 drivers/tty/serial/serial_core.c:635
process_output_block drivers/tty/n_tty.c:561 [inline]
n_tty_write+0x33f/0x4b0 drivers/tty/n_tty.c:2377
iterate_tty_write drivers/tty/tty_io.c:1015 [inline]
file_tty_write+0x1e0/0x350 drivers/tty/tty_io.c:1090
new_sync_write fs/read_write.c:591 [inline]
vfs_write+0x2c0/0x3b0 fs/read_write.c:684
ksys_write+0x74/0xf0 fs/read_write.c:736
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #1 (&port_lock_key){-.-.}-{3:3}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x5f/0x90 kernel/locking/spinlock.c:162
uart_port_lock_irqsave include/linux/serial_core.h:715 [inline]
serial8250_console_write+0x7e/0x850 drivers/tty/serial/8250/8250_port.c:3415
console_emit_next_record kernel/printk/printk.c:3138 [inline]
console_flush_all+0x340/0x510 kernel/printk/printk.c:3226
__console_flush_and_unlock kernel/printk/printk.c:3285 [inline]
console_unlock+0x65/0x100 kernel/printk/printk.c:3325
vprintk_emit+0x26a/0x420 kernel/printk/printk.c:2450
_printk+0x57/0x80 kernel/printk/printk.c:2475
register_console+0x35d/0x3f0 kernel/printk/printk.c:4125
univ8250_console_init+0x1e/0x40 drivers/tty/serial/8250/8250_core.c:513
console_init+0x9e/0x280 kernel/printk/printk.c:4323
start_kernel+0x25b/0x380 init/main.c:1034
x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:513
x86_64_start_kernel+0x61/0x70 arch/x86/kernel/head64.c:494
common_startup_64+0x13e/0x147
-> #0 (console_owner){....}-{0:0}:
check_prev_add kernel/locking/lockdep.c:3166 [inline]
check_prevs_add kernel/locking/lockdep.c:3285 [inline]
validate_chain kernel/locking/lockdep.c:3909 [inline]
__lock_acquire+0x14dc/0x2790 kernel/locking/lockdep.c:5235
lock_acquire+0x103/0x340 kernel/locking/lockdep.c:5866
console_trylock_spinning kernel/printk/printk.c:2048 [inline]
vprintk_emit+0x1cf/0x420 kernel/printk/printk.c:2449
_printk+0x57/0x80 kernel/printk/printk.c:2475
debug_object_is_on_stack lib/debugobjects.c:-1 [inline]
lookup_object_or_alloc lib/debugobjects.c:688 [inline]
__debug_object_init+0x215/0x2b0 lib/debugobjects.c:743
rhashtable_init_noprof+0x2e4/0x340 lib/rhashtable.c:1085
bch2_copygc_thread+0x11f/0x5a0 fs/bcachefs/movinggc.c:360
kthread+0x23c/0x270 kernel/kthread.c:464
ret_from_fork+0x32/0x40 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
other info that might help us debug this:
Chain exists of:
console_owner --> &pool->lock --> &obj_hash[i].lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&obj_hash[i].lock);
lock(&pool->lock);
lock(&obj_hash[i].lock);
lock(console_owner);
*** DEADLOCK ***
1 lock held by bch-copygc/loop/4998:
#0: ffffffff8beedb60 (&obj_hash[i].lock){-.-.}-{2:2}, at: __debug_object_init+0x5e/0x2b0 lib/debugobjects.c:741
stack backtrace:
CPU: 1 UID: 0 PID: 4998 Comm: bch-copygc/loop Not tainted 6.15.0-rc4-syzkaller #0 PREEMPT(undef)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
dump_stack_lvl+0xad/0x110 lib/dump_stack.c:120
print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2079
check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2211
check_prev_add kernel/locking/lockdep.c:3166 [inline]
check_prevs_add kernel/locking/lockdep.c:3285 [inline]
validate_chain kernel/locking/lockdep.c:3909 [inline]
__lock_acquire+0x14dc/0x2790 kernel/locking/lockdep.c:5235
lock_acquire+0x103/0x340 kernel/locking/lockdep.c:5866
console_trylock_spinning kernel/printk/printk.c:2048 [inline]
vprintk_emit+0x1cf/0x420 kernel/printk/printk.c:2449
_printk+0x57/0x80 kernel/printk/printk.c:2475
debug_object_is_on_stack lib/debugobjects.c:-1 [inline]
lookup_object_or_alloc lib/debugobjects.c:688 [inline]
__debug_object_init+0x215/0x2b0 lib/debugobjects.c:743
rhashtable_init_noprof+0x2e4/0x340 lib/rhashtable.c:1085
bch2_copygc_thread+0x11f/0x5a0 fs/bcachefs/movinggc.c:360
kthread+0x23c/0x270 kernel/kthread.c:464
ret_from_fork+0x32/0x40 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
------------[ cut here ]------------
WARNING: CPU: 1 PID: 4998 at lib/debugobjects.c:655 debug_object_is_on_stack lib/debugobjects.c:655 [inline]
WARNING: CPU: 1 PID: 4998 at lib/debugobjects.c:655 lookup_object_or_alloc lib/debugobjects.c:688 [inline]
WARNING: CPU: 1 PID: 4998 at lib/debugobjects.c:655 __debug_object_init+0x219/0x2b0 lib/debugobjects.c:743
Modules linked in:
CPU: 1 UID: 0 PID: 4998 Comm: bch-copygc/loop Not tainted 6.15.0-rc4-syzkaller #0 PREEMPT(undef)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:debug_object_is_on_stack lib/debugobjects.c:655 [inline]
RIP: 0010:lookup_object_or_alloc lib/debugobjects.c:688 [inline]
RIP: 0010:__debug_object_init+0x219/0x2b0 lib/debugobjects.c:743
Code: 89 0d 2b 00 0d 0a 48 c7 c1 7e 18 a4 83 48 c7 c7 10 f5 86 83 40 84 f6 48 0f 45 f9 48 89 de 49 89 c6 e8 ab d6 34 ff 4c 89 f0 90 <0f> 0b 90 e9 cf fe ff ff e8 7a 11 00 00 8b 05 fc c4 fe 01 3b 05 fa
RSP: 0018:ffffc90003e37a78 EFLAGS: 00010046
RAX: ffff888103322d70 RBX: ffffc90003e37b48 RCX: 3fea801e6bcf9400
RDX: ffff8882b300c000 RSI: ffffffff838c571f RDI: 00000000ffffffff
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 5b5d303938383439 R11: ffffffff82089fe0 R12: 0000000000000286
R13: ffffffff83015b70 R14: ffff888103322d70 R15: ffffffff8beedb48
FS: 0000000000000000(0000) GS:ffff8882b300c000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f26cff71da0 CR3: 0000000179e84000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
rhashtable_init_noprof+0x2e4/0x340 lib/rhashtable.c:1085
bch2_copygc_thread+0x11f/0x5a0 fs/bcachefs/movinggc.c:360
kthread+0x23c/0x270 kernel/kthread.c:464
ret_from_fork+0x32/0x40 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245