FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
======================================================
WARNING: possible circular locking dependency detected
6.11.0-rc6-syzkaller-00183-gb831f83e40a2 #0 Not tainted
------------------------------------------------------
syz.3.84/5592 is trying to acquire lock:
ffffffff8e92c400 (console_owner){-...}-{0:0}, at: console_trylock_spinning kernel/printk/printk.c:1997 [inline]
ffffffff8e92c400 (console_owner){-...}-{0:0}, at: vprintk_emit+0x405/0x7c0 kernel/printk/printk.c:2347
but task is already holding lock:
ffff8880b8828948 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: __schedule+0x8f1/0x4a60 kernel/sched/core.c:6523
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #5 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
do_write_seqcount_begin_nested include/linux/seqlock.h:469 [inline]
do_write_seqcount_begin include/linux/seqlock.h:495 [inline]
psi_group_change+0x1c3/0x11c0 kernel/sched/psi.c:791
psi_task_change+0xfd/0x280 kernel/sched/psi.c:913
psi_enqueue kernel/sched/stats.h:143 [inline]
enqueue_task+0x2aa/0x300 kernel/sched/core.c:1975
activate_task kernel/sched/core.c:2009 [inline]
wake_up_new_task+0x563/0xc30 kernel/sched/core.c:4689
kernel_clone+0x4ee/0x8f0 kernel/fork.c:2812
user_mode_thread+0x132/0x1a0 kernel/fork.c:2859
rest_init+0x23/0x300 init/main.c:712
start_kernel+0x47a/0x500 init/main.c:1103
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 (&rq->__lock){-.-.}-{2:2}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
_raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378
raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:560
raw_spin_rq_lock kernel/sched/sched.h:1415 [inline]
rq_lock kernel/sched/sched.h:1714 [inline]
task_fork_fair+0x61/0x1e0 kernel/sched/fair.c:12710
sched_cgroup_fork+0x37c/0x410 kernel/sched/core.c:4633
copy_process+0x2217/0x3dc0 kernel/fork.c:2483
kernel_clone+0x226/0x8f0 kernel/fork.c:2781
user_mode_thread+0x132/0x1a0 kernel/fork.c:2859
rest_init+0x23/0x300 init/main.c:712
start_kernel+0x47a/0x500 init/main.c:1103
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
-> #3 (&p->pi_lock){-.-.}-{2:2}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
__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+0xb0/0x1470 kernel/sched/core.c:4051
__wake_up_common kernel/sched/wait.c:89 [inline]
__wake_up_common_lock+0x130/0x1e0 kernel/sched/wait.c:106
tty_port_default_wakeup+0xa6/0xf0 drivers/tty/tty_port.c:69
serial8250_tx_chars+0x6e2/0x930 drivers/tty/serial/8250/8250_port.c:1821
serial8250_handle_irq+0x558/0x710 drivers/tty/serial/8250/8250_port.c:1929
serial8250_default_handle_irq+0xd1/0x1f0 drivers/tty/serial/8250/8250_port.c:1949
serial8250_interrupt+0xa9/0x1f0 drivers/tty/serial/8250/8250_core.c:86
__handle_irq_event_percpu+0x29a/0xa80 kernel/irq/handle.c:158
handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
handle_irq_event+0x89/0x1f0 kernel/irq/handle.c:210
handle_edge_irq+0x25f/0xc20 kernel/irq/chip.c:831
generic_handle_irq_desc include/linux/irqdesc.h:173 [inline]
handle_irq arch/x86/kernel/irq.c:247 [inline]
call_irq_handler arch/x86/kernel/irq.c:259 [inline]
__common_interrupt+0x136/0x230 arch/x86/kernel/irq.c:285
common_interrupt+0xa5/0xd0 arch/x86/kernel/irq.c:278
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
arch_safe_halt arch/x86/include/asm/irqflags.h:106 [inline]
acpi_safe_halt+0x21/0x30 drivers/acpi/processor_idle.c:111
acpi_idle_enter+0xe4/0x140 drivers/acpi/processor_idle.c:702
cpuidle_enter_state+0x112/0x480 drivers/cpuidle/cpuidle.c:267
cpuidle_enter+0x5d/0xa0 drivers/cpuidle/cpuidle.c:388
call_cpuidle kernel/sched/idle.c:155 [inline]
cpuidle_idle_call kernel/sched/idle.c:230 [inline]
do_idle+0x375/0x5d0 kernel/sched/idle.c:326
cpu_startup_entry+0x42/0x60 kernel/sched/idle.c:424
__pfx_ap_starting+0x0/0x10 arch/x86/kernel/smpboot.c:313
common_startup_64+0x13e/0x147
-> #2 (
&tty->write_wait){-.-.}-{2:2}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
__wake_up_common_lock+0x25/0x1e0 kernel/sched/wait.c:105
tty_port_default_wakeup+0xa6/0xf0 drivers/tty/tty_port.c:69
serial8250_tx_chars+0x6e2/0x930 drivers/tty/serial/8250/8250_port.c:1821
serial8250_handle_irq+0x558/0x710 drivers/tty/serial/8250/8250_port.c:1929
serial8250_default_handle_irq+0xd1/0x1f0 drivers/tty/serial/8250/8250_port.c:1949
serial8250_interrupt+0xa9/0x1f0 drivers/tty/serial/8250/8250_core.c:86
__handle_irq_event_percpu+0x29a/0xa80 kernel/irq/handle.c:158
handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
handle_irq_event+0x89/0x1f0 kernel/irq/handle.c:210
handle_edge_irq+0x25f/0xc20 kernel/irq/chip.c:831
generic_handle_irq_desc include/linux/irqdesc.h:173 [inline]
handle_irq arch/x86/kernel/irq.c:247 [inline]
call_irq_handler arch/x86/kernel/irq.c:259 [inline]
__common_interrupt+0x136/0x230 arch/x86/kernel/irq.c:285
common_interrupt+0xa5/0xd0 arch/x86/kernel/irq.c:278
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
_raw_spin_unlock_irqrestore+0xd8/0x140 kernel/locking/spinlock.c:194
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
uart_port_unlock_irqrestore include/linux/serial_core.h:669 [inline]
uart_write+0x15d/0x380 drivers/tty/serial/serial_core.c:634
process_output_block drivers/tty/n_tty.c:574 [inline]
n_tty_write+0xd6a/0x1230 drivers/tty/n_tty.c:2389
iterate_tty_write drivers/tty/tty_io.c:1021 [inline]
file_tty_write+0x54f/0x9c0 drivers/tty/tty_io.c:1096
new_sync_write fs/read_write.c:497 [inline]
vfs_write+0xa72/0xc90 fs/read_write.c:590
ksys_write+0x1a0/0x2c0 fs/read_write.c:643
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){-.-.}-{2:2}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
__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:618 [inline]
serial8250_console_write+0x1a8/0x1770 drivers/tty/serial/8250/8250_port.c:3352
console_emit_next_record kernel/printk/printk.c:2983 [inline]
console_flush_all+0x867/0xfd0 kernel/printk/printk.c:3049
console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3118
vprintk_emit+0x5dc/0x7c0 kernel/printk/printk.c:2348
_printk+0xd5/0x120 kernel/printk/printk.c:2373
register_console+0x727/0xcf0 kernel/printk/printk.c:3654
univ8250_console_init+0x52/0x90 drivers/tty/serial/8250/8250_core.c:513
console_init+0x1b8/0x6f0 kernel/printk/printk.c:3800
start_kernel+0x2d3/0x500 init/main.c:1038
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:3133 [inline]
check_prevs_add kernel/locking/lockdep.c:3252 [inline]
validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3868
__lock_acquire+0x137a/0x2040 kernel/locking/lockdep.c:5142
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
console_trylock_spinning kernel/printk/printk.c:1997 [inline]
vprintk_emit+0x422/0x7c0 kernel/printk/printk.c:2347
_printk+0xd5/0x120 kernel/printk/printk.c:2373
fail_dump lib/fault-inject.c:45 [inline]
should_fail_ex+0x391/0x4e0 lib/fault-inject.c:153
strncpy_from_user+0x36/0x2e0 lib/strncpy_from_user.c:118
strncpy_from_user_nofault+0x71/0x140 mm/maccess.c:186
bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:216 [inline]
____bpf_probe_read_compat_str kernel/trace/bpf_trace.c:311 [inline]
bpf_probe_read_compat_str+0xe9/0x180 kernel/trace/bpf_trace.c:307
bpf_prog_29e826963d3c3848+0x40/0x44
bpf_dispatcher_nop_func include/linux/bpf.h:1243 [inline]
__bpf_prog_run include/linux/filter.h:691 [inline]
bpf_prog_run include/linux/filter.h:698 [inline]
bpf_prog_run_array include/linux/bpf.h:2104 [inline]
trace_call_bpf+0x369/0x8a0 kernel/trace/bpf_trace.c:147
perf_trace_run_bpf_submit+0x82/0x180 kernel/events/core.c:10304
perf_trace_lock+0x388/0x490 include/trace/events/lock.h:50
trace_lock_release include/trace/events/lock.h:69 [inline]
lock_release+0x9cc/0xa30 kernel/locking/lockdep.c:5770
do_write_seqcount_end include/linux/seqlock.h:515 [inline]
psi_account_irqtime+0x49f/0x750 kernel/sched/psi.c:1032
__schedule+0x8f1/0x4a60 kernel/sched/core.c:6523
preempt_schedule_notrace+0x100/0x140 kernel/sched/core.c:6801
preempt_schedule_notrace_thunk+0x1a/0x30 arch/x86/entry/thunk.S:13
trace_lock_release include/trace/events/lock.h:69 [inline]
lock_release+0x9f0/0xa30 kernel/locking/lockdep.c:5770
rcu_lock_release include/linux/rcupdate.h:336 [inline]
rcu_read_unlock include/linux/rcupdate.h:869 [inline]
__fget_files+0x3f1/0x470 fs/file.c:1033
__fget_light fs/file.c:1147 [inline]
__fdget+0x16c/0x1e0 fs/file.c:1155
fdget include/linux/file.h:66 [inline]
sockfd_lookup_light net/socket.c:555 [inline]
__sys_sendmsg+0xe7/0x3a0 net/socket.c:2676
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 --> &rq->__lock --> &per_cpu_ptr(group->pcpu, cpu)->seq
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&per_cpu_ptr(group->pcpu, cpu)->seq);
lock(&rq->__lock);
lock(&per_cpu_ptr(group->pcpu, cpu)->seq);
lock(console_owner);
*** DEADLOCK ***
4 locks held by syz.3.84/5592:
#0: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline]
#0: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
#0: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: __fget_files+0x29/0x470 fs/file.c:1031
#1: ffff8880b883e9d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:560
#2: ffff8880b8828948 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: __schedule+0x8f1/0x4a60 kernel/sched/core.c:6523
#3: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: trace_call_bpf+0xbc/0x8a0
stack backtrace:
CPU: 0 UID: 0 PID: 5592 Comm: syz.3.84 Not tainted 6.11.0-rc6-syzkaller-00183-gb831f83e40a2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:93 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2186
check_prev_add kernel/locking/lockdep.c:3133 [inline]
check_prevs_add kernel/locking/lockdep.c:3252 [inline]
validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3868
__lock_acquire+0x137a/0x2040 kernel/locking/lockdep.c:5142
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
console_trylock_spinning kernel/printk/printk.c:1997 [inline]
vprintk_emit+0x422/0x7c0 kernel/printk/printk.c:2347
_printk+0xd5/0x120 kernel/printk/printk.c:2373
fail_dump lib/fault-inject.c:45 [inline]
should_fail_ex+0x391/0x4e0 lib/fault-inject.c:153
strncpy_from_user+0x36/0x2e0 lib/strncpy_from_user.c:118
strncpy_from_user_nofault+0x71/0x140 mm/maccess.c:186
bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:216 [inline]
____bpf_probe_read_compat_str kernel/trace/bpf_trace.c:311 [inline]
bpf_probe_read_compat_str+0xe9/0x180 kernel/trace/bpf_trace.c:307
bpf_prog_29e826963d3c3848+0x40/0x44
bpf_dispatcher_nop_func include/linux/bpf.h:1243 [inline]
__bpf_prog_run include/linux/filter.h:691 [inline]
bpf_prog_run include/linux/filter.h:698 [inline]
bpf_prog_run_array include/linux/bpf.h:2104 [inline]
trace_call_bpf+0x369/0x8a0 kernel/trace/bpf_trace.c:147
perf_trace_run_bpf_submit+0x82/0x180 kernel/events/core.c:10304
perf_trace_lock+0x388/0x490 include/trace/events/lock.h:50
trace_lock_release include/trace/events/lock.h:69 [inline]
lock_release+0x9cc/0xa30 kernel/locking/lockdep.c:5770
do_write_seqcount_end include/linux/seqlock.h:515 [inline]
psi_account_irqtime+0x49f/0x750 kernel/sched/psi.c:1032
__schedule+0x8f1/0x4a60 kernel/sched/core.c:6523
preempt_schedule_notrace+0x100/0x140 kernel/sched/core.c:6801
preempt_schedule_notrace_thunk+0x1a/0x30 arch/x86/entry/thunk.S:13
trace_lock_release include/trace/events/lock.h:69 [inline]
lock_release+0x9f0/0xa30 kernel/locking/lockdep.c:5770
rcu_lock_release include/linux/rcupdate.h:336 [inline]
rcu_read_unlock include/linux/rcupdate.h:869 [inline]
__fget_files+0x3f1/0x470 fs/file.c:1033
__fget_light fs/file.c:1147 [inline]
__fdget+0x16c/0x1e0 fs/file.c:1155
fdget include/linux/file.h:66 [inline]
sockfd_lookup_light net/socket.c:555 [inline]
__sys_sendmsg+0xe7/0x3a0 net/socket.c:2676
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: 0033:0x7f1432b7def9
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:00007f14339b6038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f1432d35f80 RCX: 00007f1432b7def9
RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000009
RBP: 00007f14339b6090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007f1432d35f80 R15: 00007ffef36b3a38
</TASK>
CPU: 0 UID: 0 PID: 5592 Comm: syz.3.84 Not tainted 6.11.0-rc6-syzkaller-00183-gb831f83e40a2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:93 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
fail_dump lib/fault-inject.c:52 [inline]
should_fail_ex+0x3b0/0x4e0 lib/fault-inject.c:153
strncpy_from_user+0x36/0x2e0 lib/strncpy_from_user.c:118
strncpy_from_user_nofault+0x71/0x140 mm/maccess.c:186
bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:216 [inline]
____bpf_probe_read_compat_str kernel/trace/bpf_trace.c:311 [inline]
bpf_probe_read_compat_str+0xe9/0x180 kernel/trace/bpf_trace.c:307
bpf_prog_29e826963d3c3848+0x40/0x44
bpf_dispatcher_nop_func include/linux/bpf.h:1243 [inline]
__bpf_prog_run include/linux/filter.h:691 [inline]
bpf_prog_run include/linux/filter.h:698 [inline]
bpf_prog_run_array include/linux/bpf.h:2104 [inline]
trace_call_bpf+0x369/0x8a0 kernel/trace/bpf_trace.c:147
perf_trace_run_bpf_submit+0x82/0x180 kernel/events/core.c:10304
perf_trace_lock+0x388/0x490 include/trace/events/lock.h:50
trace_lock_release include/trace/events/lock.h:69 [inline]
lock_release+0x9cc/0xa30 kernel/locking/lockdep.c:5770
do_write_seqcount_end include/linux/seqlock.h:515 [inline]
psi_account_irqtime+0x49f/0x750 kernel/sched/psi.c:1032
__schedule+0x8f1/0x4a60 kernel/sched/core.c:6523
preempt_schedule_notrace+0x100/0x140 kernel/sched/core.c:6801
preempt_schedule_notrace_thunk+0x1a/0x30 arch/x86/entry/thunk.S:13
trace_lock_release include/trace/events/lock.h:69 [inline]
lock_release+0x9f0/0xa30 kernel/locking/lockdep.c:5770
rcu_lock_release include/linux/rcupdate.h:336 [inline]
rcu_read_unlock include/linux/rcupdate.h:869 [inline]
__fget_files+0x3f1/0x470 fs/file.c:1033
__fget_light fs/file.c:1147 [inline]
__fdget+0x16c/0x1e0 fs/file.c:1155
fdget include/linux/file.h:66 [inline]
sockfd_lookup_light net/socket.c:555 [inline]
__sys_sendmsg+0xe7/0x3a0 net/socket.c:2676
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: 0033:0x7f1432b7def9
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:00007f14339b6038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f1432d35f80 RCX: 00007f1432b7def9
RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000009
RBP: 00007f14339b6090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007f1432d35f80 R15: 00007ffef36b3a38
</TASK>