loop5: detected capacity change from 0 to 16
erofs: (device loop5): mounted with root inode @ nid 36.
FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
======================================================
WARNING: possible circular locking dependency detected
6.12.0-rc6-next-20241108-syzkaller #0 Not tainted
------------------------------------------------------
syz.5.308/7467 is trying to acquire lock:
ffffffff8e817aa0 (console_owner){-.-.}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:342 [inline]
ffffffff8e817aa0 (console_owner){-.-.}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:303 [inline]
ffffffff8e817aa0 (console_owner){-.-.}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:288 [inline]
ffffffff8e817aa0 (console_owner){-.-.}-{0:0}, at: console_flush_all+0x1a3/0xeb0 kernel/printk/printk.c:3176
but task is already holding lock:
ffff8880b863e798 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xb0/0x140 kernel/sched/core.c:606
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #5 (&rq->__lock){-.-.}-{2:2}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
_raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378
raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:598
raw_spin_rq_lock kernel/sched/sched.h:1513 [inline]
task_rq_lock+0xc6/0x360 kernel/sched/core.c:700
cgroup_move_task+0x9b/0x5a0 kernel/sched/psi.c:1161
css_set_move_task+0x72e/0x950 kernel/cgroup/cgroup.c:898
cgroup_post_fork+0x256/0x880 kernel/cgroup/cgroup.c:6691
copy_process+0x39e9/0x3d50 kernel/fork.c:2598
kernel_clone+0x226/0x8f0 kernel/fork.c:2784
user_mode_thread+0x132/0x1a0 kernel/fork.c:2862
rest_init+0x23/0x300 init/main.c:712
start_kernel+0x47f/0x500 init/main.c:1102
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
-> #4 (&p->pi_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
class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:551 [inline]
try_to_wake_up+0xc2/0x1470 kernel/sched/core.c:4205
create_worker+0x507/0x720 kernel/workqueue.c:2825
workqueue_init+0x520/0x8a0 kernel/workqueue.c:7902
kernel_init_freeable+0x3fe/0x5d0 init/main.c:1561
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
-> #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+0x248/0x880 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:3371
console_emit_next_record kernel/printk/printk.c:3111 [inline]
console_flush_all+0x86b/0xeb0 kernel/printk/printk.c:3199
__console_flush_and_unlock kernel/printk/printk.c:3258 [inline]
console_unlock+0x14f/0x3b0 kernel/printk/printk.c:3298
vprintk_emit+0x730/0xa10 kernel/printk/printk.c:2426
_printk+0xd5/0x120 kernel/printk/printk.c:2451
register_console+0xbf5/0xfd0 kernel/printk/printk.c:4088
univ8250_console_init+0x52/0x90 drivers/tty/serial/8250/8250_core.c:513
console_init+0x1b8/0x6f0 kernel/printk/printk.c:4281
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_lock_spinning_enable kernel/printk/printk.c:1924 [inline]
console_emit_next_record kernel/printk/printk.c:3105 [inline]
console_flush_all+0x7f8/0xeb0 kernel/printk/printk.c:3199
__console_flush_and_unlock kernel/printk/printk.c:3258 [inline]
console_unlock+0x14f/0x3b0 kernel/printk/printk.c:3298
vprintk_emit+0x730/0xa10 kernel/printk/printk.c:2426
_printk+0xd5/0x120 kernel/printk/printk.c:2451
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_c1796171ffc7efef+0x3e/0x40
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:2340 [inline]
bpf_trace_run4+0x334/0x590 kernel/trace/bpf_trace.c:2383
__traceiter_sched_switch+0x98/0xd0 include/trace/events/sched.h:222
trace_sched_switch include/trace/events/sched.h:222 [inline]
__schedule+0x22bc/0x4c30 kernel/sched/core.c:6750
preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7075
irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
syscall_enter_from_user_mode_work include/linux/entry-common.h:166 [inline]
syscall_enter_from_user_mode include/linux/entry-common.h:199 [inline]
do_syscall_64+0xbc/0x230 arch/x86/entry/common.c:79
entry_SYSCALL_64_after_hwframe+0x77/0x7f
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 ***
4 locks held by syz.5.308/7467:
#0: ffff8880b863e798 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xb0/0x140 kernel/sched/core.c:606
#1: ffffffff8e93c560 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#1: ffffffff8e93c560 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#1: ffffffff8e93c560 (rcu_read_lock){....}-{1:3}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2339 [inline]
#1: ffffffff8e93c560 (rcu_read_lock){....}-{1:3}, at: bpf_trace_run4+0x244/0x590 kernel/trace/bpf_trace.c:2383
#2: ffffffff8e817b00 (console_lock){+.+.}-{0:0}, at: _printk+0xd5/0x120 kernel/printk/printk.c:2451
#3: ffffffff8e817710 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:342 [inline]
#3: ffffffff8e817710 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:303 [inline]
#3: ffffffff8e817710 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:288 [inline]
#3: ffffffff8e817710 (console_srcu){....}-{0:0}, at: console_flush_all+0x1a3/0xeb0 kernel/printk/printk.c:3176
stack backtrace:
CPU: 0 UID: 0 PID: 7467 Comm: syz.5.308 Not tainted 6.12.0-rc6-next-20241108-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
Call Trace:
__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_lock_spinning_enable kernel/printk/printk.c:1924 [inline]
console_emit_next_record kernel/printk/printk.c:3105 [inline]
console_flush_all+0x7f8/0xeb0 kernel/printk/printk.c:3199
__console_flush_and_unlock kernel/printk/printk.c:3258 [inline]
console_unlock+0x14f/0x3b0 kernel/printk/printk.c:3298
vprintk_emit+0x730/0xa10 kernel/printk/printk.c:2426
_printk+0xd5/0x120 kernel/printk/printk.c:2451
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_c1796171ffc7efef+0x3e/0x40
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:2340 [inline]
bpf_trace_run4+0x334/0x590 kernel/trace/bpf_trace.c:2383
__traceiter_sched_switch+0x98/0xd0 include/trace/events/sched.h:222
trace_sched_switch include/trace/events/sched.h:222 [inline]
__schedule+0x22bc/0x4c30 kernel/sched/core.c:6750
preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7075
irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:syscall_enter_from_user_mode_work include/linux/entry-common.h:168 [inline]
RIP: 0010:syscall_enter_from_user_mode include/linux/entry-common.h:199 [inline]
RIP: 0010:do_syscall_64+0xbc/0x230 arch/x86/entry/common.c:79
Code: ed 00 00 00 48 8b 7d 08 e8 c1 64 00 00 0f 1f 44 00 00 0f 1f 44 00 00 90 e8 51 86 e3 f5 90 90 e8 fa 85 e3 f5 fb 49 8b 54 24 08 c2 3f 74 0e 4c 89 f7 4c 89 fe e8 54 69 c5 f5 49 89 c7 90 90 41
RSP: 0018:ffffc9000fc8ff10 EFLAGS: 00000282
RAX: 3f0cdef3b45a6c00 RBX: ffffc9000fc8ff10 RCX: ffffffff9a3bf903
RDX: 0000000000000000 RSI: ffffffff8c0ad880 RDI: ffffffff8c605b60
RBP: ffffc9000fc8ff48 R08: ffffffff901c8877 R09: 1ffffffff203910e
R10: dffffc0000000000 R11: fffffbfff203910f R12: ffff888075c50000
R13: 0000000000000000 R14: ffffc9000fc8ff58 R15: 00000000000000e6
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6fdfb7e719
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:00007f6fe0a03038 EFLAGS: 00000246 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 00007f6fdfd36130 RCX: 00007f6fdfb7e719
RDX: 0000000020000300 RSI: 0000000000000000 RDI: 0000000000000002
RBP: 00007f6fe0a03090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007f6fdfd36130 R15: 00007ffdb4beaa18
CPU: 0 UID: 0 PID: 7467 Comm: syz.5.308 Not tainted 6.12.0-rc6-next-20241108-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
Call Trace:
__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_c1796171ffc7efef+0x3e/0x40
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:2340 [inline]
bpf_trace_run4+0x334/0x590 kernel/trace/bpf_trace.c:2383
__traceiter_sched_switch+0x98/0xd0 include/trace/events/sched.h:222
trace_sched_switch include/trace/events/sched.h:222 [inline]
__schedule+0x22bc/0x4c30 kernel/sched/core.c:6750
preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:7075
irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:syscall_enter_from_user_mode_work include/linux/entry-common.h:168 [inline]
RIP: 0010:syscall_enter_from_user_mode include/linux/entry-common.h:199 [inline]
RIP: 0010:do_syscall_64+0xbc/0x230 arch/x86/entry/common.c:79
Code: ed 00 00 00 48 8b 7d 08 e8 c1 64 00 00 0f 1f 44 00 00 0f 1f 44 00 00 90 e8 51 86 e3 f5 90 90 e8 fa 85 e3 f5 fb 49 8b 54 24 08 c2 3f 74 0e 4c 89 f7 4c 89 fe e8 54 69 c5 f5 49 89 c7 90 90 41
RSP: 0018:ffffc9000fc8ff10 EFLAGS: 00000282
RAX: 3f0cdef3b45a6c00 RBX: ffffc9000fc8ff10 RCX: ffffffff9a3bf903
RDX: 0000000000000000 RSI: ffffffff8c0ad880 RDI: ffffffff8c605b60
RBP: ffffc9000fc8ff48 R08: ffffffff901c8877 R09: 1ffffffff203910e
R10: dffffc0000000000 R11: fffffbfff203910f R12: ffff888075c50000
R13: 0000000000000000 R14: ffffc9000fc8ff58 R15: 00000000000000e6
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6fdfb7e719
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:00007f6fe0a03038 EFLAGS: 00000246 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 00007f6fdfd36130 RCX: 00007f6fdfb7e719
RDX: 0000000020000300 RSI: 0000000000000000 RDI: 0000000000000002
RBP: 00007f6fe0a03090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007f6fdfd36130 R15: 00007ffdb4beaa18
----------------
Code disassembly (best guess):
0: ed in (%dx),%eax
1: 00 00 add %al,(%rax)
3: 00 48 8b add %cl,-0x75(%rax)
6: 7d 08 jge 0x10
8: e8 c1 64 00 00 call 0x64ce
d: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
12: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
17: 90 nop
18: e8 51 86 e3 f5 call 0xf5e3866e
1d: 90 nop
1e: 90 nop
1f: e8 fa 85 e3 f5 call 0xf5e3861e
24: fb sti
25: 49 8b 54 24 08 mov 0x8(%r12),%rdx
* 2a: f6 c2 3f test $0x3f,%dl <-- trapping instruction
2d: 74 0e je 0x3d
2f: 4c 89 f7 mov %r14,%rdi
32: 4c 89 fe mov %r15,%rsi
35: e8 54 69 c5 f5 call 0xf5c5698e
3a: 49 89 c7 mov %rax,%r15
3d: 90 nop
3e: 90 nop
3f: 41 rex.B