FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
======================================================
WARNING: possible circular locking dependency detected
6.10.0-rc6-next-20240703-syzkaller #0 Not tainted
------------------------------------------------------
syz.0.32/5315 is trying to acquire lock:
ffffffff8e211040 (console_owner){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:338 [inline]
ffffffff8e211040 (console_owner){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:267 [inline]
ffffffff8e211040 (console_owner){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:287 [inline]
ffffffff8e211040 (console_owner){....}-{0:0}, at: console_flush_all+0x147/0xf50 kernel/printk/printk.c:3018
but task is already holding lock:
ffff8880b953ea18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:568
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #4 (&rq->__lock){-.-.}-{2:2}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5816
_raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378
raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:568
raw_spin_rq_lock kernel/sched/sched.h:1476 [inline]
rq_lock kernel/sched/sched.h:1775 [inline]
task_fork_fair+0x61/0x1e0 kernel/sched/fair.c:12701
sched_cgroup_fork+0x386/0x420 kernel/sched/core.c:4685
copy_process+0x2201/0x3d90 kernel/fork.c:2485
kernel_clone+0x226/0x8f0 kernel/fork.c:2788
user_mode_thread+0x132/0x1a0 kernel/fork.c:2866
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:5816
__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:4085
__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+0x630/0xb80 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:112
acpi_idle_enter+0xe4/0x140 drivers/acpi/processor_idle.c:707
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:5816
__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+0x630/0xb80 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:112
acpi_idle_enter+0xe4/0x140 drivers/acpi/processor_idle.c:707
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
-> #1 (&port_lock_key){-...}-{2:2}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5816
__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:711 [inline]
serial8250_console_write+0x1a7/0x1ed0 drivers/tty/serial/8250/8250_port.c:3352
console_emit_next_record kernel/printk/printk.c:2960 [inline]
console_flush_all+0x882/0xf50 kernel/printk/printk.c:3032
console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3103
vprintk_emit+0x7a1/0x900 kernel/printk/printk.c:2423
_printk+0xd5/0x120 kernel/printk/printk.c:2450
register_console+0xbf5/0xfd0 kernel/printk/printk.c:3680
univ8250_console_init+0x52/0x90 drivers/tty/serial/8250/8250_core.c:513
console_init+0x1b8/0x6f0 kernel/printk/printk.c:3862
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:3158 [inline]
check_prevs_add kernel/locking/lockdep.c:3277 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3901
__lock_acquire+0x1359/0x2000 kernel/locking/lockdep.c:5193
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5816
console_lock_spinning_enable kernel/printk/printk.c:1897 [inline]
console_emit_next_record kernel/printk/printk.c:2954 [inline]
console_flush_all+0x822/0xf50 kernel/printk/printk.c:3032
console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3103
vprintk_emit+0x7a1/0x900 kernel/printk/printk.c:2423
_printk+0xd5/0x120 kernel/printk/printk.c:2450
fail_dump lib/fault-inject.c:45 [inline]
should_fail_ex+0x391/0x4e0 lib/fault-inject.c:153
strncpy_from_user+0x36/0x2f0 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_e3f550b2299101ce+0x40/0x42
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_trace_run kernel/trace/bpf_trace.c:2406 [inline]
bpf_trace_run4+0x334/0x590 kernel/trace/bpf_trace.c:2449
trace_sched_switch include/trace/events/sched.h:222 [inline]
__schedule+0x2591/0x4a60 kernel/sched/core.c:6597
preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6922
irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
ksys_write+0x1a3/0x2c0 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
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 ***
5 locks held by syz.0.32/5315:
#0: ffff88801f0eb748 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x310 fs/file.c:1191
#1: ffff8880b953ea18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:568
#2: ffffffff8e335860 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:333 [inline]
#2: ffffffff8e335860 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:845 [inline]
#2: ffffffff8e335860 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2405 [inline]
#2: ffffffff8e335860 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run4+0x244/0x590 kernel/trace/bpf_trace.c:2449
#3: ffffffff8e2110a0 (console_lock){+.+.}-{0:0}, at: _printk+0xd5/0x120 kernel/printk/printk.c:2450
#4: ffffffff8e210cb0 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:338 [inline]
#4: ffffffff8e210cb0 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:267 [inline]
#4: ffffffff8e210cb0 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:287 [inline]
#4: ffffffff8e210cb0 (console_srcu){....}-{0:0}, at: console_flush_all+0x147/0xf50 kernel/printk/printk.c:3018
stack backtrace:
CPU: 1 UID: 0 PID: 5315 Comm: syz.0.32 Not tainted 6.10.0-rc6-next-20240703-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
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:2203
check_prev_add kernel/locking/lockdep.c:3158 [inline]
check_prevs_add kernel/locking/lockdep.c:3277 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3901
__lock_acquire+0x1359/0x2000 kernel/locking/lockdep.c:5193
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5816
console_lock_spinning_enable kernel/printk/printk.c:1897 [inline]
console_emit_next_record kernel/printk/printk.c:2954 [inline]
console_flush_all+0x822/0xf50 kernel/printk/printk.c:3032
console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3103
vprintk_emit+0x7a1/0x900 kernel/printk/printk.c:2423
_printk+0xd5/0x120 kernel/printk/printk.c:2450
fail_dump lib/fault-inject.c:45 [inline]
should_fail_ex+0x391/0x4e0 lib/fault-inject.c:153
strncpy_from_user+0x36/0x2f0 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_e3f550b2299101ce+0x40/0x42
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_trace_run kernel/trace/bpf_trace.c:2406 [inline]
bpf_trace_run4+0x334/0x590 kernel/trace/bpf_trace.c:2449
trace_sched_switch include/trace/events/sched.h:222 [inline]
__schedule+0x2591/0x4a60 kernel/sched/core.c:6597
preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6922
irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:ksys_write+0x1a3/0x2c0 fs/read_write.c:644
Code: e8 72 40 89 ff 45 31 ed 48 bb 00 00 00 00 00 fc ff df 4c 89 e7 48 8b 74 24 30 48 8b 54 24 38 4c 89 e9 e8 b0 ed ff ff 49 89 c4 <31> ff 48 89 c6 e8 23 45 89 ff 4d 85 ed 74 57 4d 85 e4 78 52 e8 34
RSP: 0018:ffffc90004887e20 EFLAGS: 00000246
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: ffff88802f07da00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc90004887f00 R08: ffffffff820aecbc R09: 1ffffffff1f5ef4d
R10: dffffc0000000000 R11: fffffbfff1f5ef4e R12: 0000000000000001
R13: ffffc90004887e80 R14: ffff88801f0eb683 R15: ffff88801f0eb770
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: 0033:0x7f553897475f
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 29 8c 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 7c 8c 02 00 48
RSP: 002b:00007f55383ff040 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00007f553897475f
RDX: 0000000000000001 RSI: 00007f55383ff0a0 RDI: 0000000000000006
RBP: 00007f55383ff0a0 R08: 0000000000000000 R09: 00007f55383fee07
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001
R13: 000000000000006e R14: 00007f5538b04110 R15: 00007ffeb8c7ae88
CPU: 1 UID: 0 PID: 5315 Comm: syz.0.32 Not tainted 6.10.0-rc6-next-20240703-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
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:52 [inline]
should_fail_ex+0x3b0/0x4e0 lib/fault-inject.c:153
strncpy_from_user+0x36/0x2f0 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_e3f550b2299101ce+0x40/0x42
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_trace_run kernel/trace/bpf_trace.c:2406 [inline]
bpf_trace_run4+0x334/0x590 kernel/trace/bpf_trace.c:2449
trace_sched_switch include/trace/events/sched.h:222 [inline]
__schedule+0x2591/0x4a60 kernel/sched/core.c:6597
preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6922
irqentry_exit+0x5e/0x90 kernel/entry/common.c:354
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:ksys_write+0x1a3/0x2c0 fs/read_write.c:644
Code: e8 72 40 89 ff 45 31 ed 48 bb 00 00 00 00 00 fc ff df 4c 89 e7 48 8b 74 24 30 48 8b 54 24 38 4c 89 e9 e8 b0 ed ff ff 49 89 c4 <31> ff 48 89 c6 e8 23 45 89 ff 4d 85 ed 74 57 4d 85 e4 78 52 e8 34
RSP: 0018:ffffc90004887e20 EFLAGS: 00000246
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: ffff88802f07da00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc90004887f00 R08: ffffffff820aecbc R09: 1ffffffff1f5ef4d
R10: dffffc0000000000 R11: fffffbfff1f5ef4e R12: 0000000000000001
R13: ffffc90004887e80 R14: ffff88801f0eb683 R15: ffff88801f0eb770
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: 0033:0x7f553897475f
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 29 8c 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 7c 8c 02 00 48
RSP: 002b:00007f55383ff040 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00007f553897475f
RDX: 0000000000000001 RSI: 00007f55383ff0a0 RDI: 0000000000000006
RBP: 00007f55383ff0a0 R08: 0000000000000000 R09: 00007f55383fee07
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001
R13: 000000000000006e R14: 00007f5538b04110 R15: 00007ffeb8c7ae88
----------------
Code disassembly (best guess):
0: e8 72 40 89 ff call 0xff894077
5: 45 31 ed xor %r13d,%r13d
8: 48 bb 00 00 00 00 00 movabs $0xdffffc0000000000,%rbx
f: fc ff df
12: 4c 89 e7 mov %r12,%rdi
15: 48 8b 74 24 30 mov 0x30(%rsp),%rsi
1a: 48 8b 54 24 38 mov 0x38(%rsp),%rdx
1f: 4c 89 e9 mov %r13,%rcx
22: e8 b0 ed ff ff call 0xffffedd7
27: 49 89 c4 mov %rax,%r12
* 2a: 31 ff xor %edi,%edi <-- trapping instruction
2c: 48 89 c6 mov %rax,%rsi
2f: e8 23 45 89 ff call 0xff894557
34: 4d 85 ed test %r13,%r13
37: 74 57 je 0x90
39: 4d 85 e4 test %r12,%r12
3c: 78 52 js 0x90
3e: e8 .byte 0xe8
3f: 34 .byte 0x34