FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
======================================================
WARNING: possible circular locking dependency detected
5.17.0-rc5-syzkaller-00006-g917bbdb107f8 #0 Not tainted
------------------------------------------------------
syz-executor.4/29521 is trying to acquire lock:
ffffffff8cb11800 (console_owner){-.-.}-{0:0}, at: console_lock_spinning_enable+0x2d/0x60 kernel/printk/printk.c:1778
but task is already holding lock:
ffff8880736f6158 (&port->lock){-.-.}-{2:2}, at: pty_write+0xc5/0x170 drivers/tty/pty.c:120
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (&port->lock){-.-.}-{2:2}:
lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5639
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
tty_port_tty_get+0x21/0xe0 drivers/tty/tty_port.c:305
tty_port_default_wakeup+0x11/0x40 drivers/tty/tty_port.c:48
serial8250_tx_chars+0x68e/0x8a0 drivers/tty/serial/8250/8250_port.c:1845
serial8250_handle_irq+0x2fd/0x3e0 drivers/tty/serial/8250/8250_port.c:1932
serial8250_default_handle_irq+0xaf/0x190 drivers/tty/serial/8250/8250_port.c:1949
serial8250_interrupt+0xa3/0x1e0 drivers/tty/serial/8250/8250_core.c:126
__handle_irq_event_percpu+0x1f7/0x660 kernel/irq/handle.c:158
handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
handle_irq_event+0x83/0x1e0 kernel/irq/handle.c:210
handle_edge_irq+0x245/0xbe0 kernel/irq/chip.c:820
generic_handle_irq_desc include/linux/irqdesc.h:158 [inline]
handle_irq arch/x86/kernel/irq.c:231 [inline]
__common_interrupt+0xce/0x1e0 arch/x86/kernel/irq.c:250
common_interrupt+0x4a/0xc0 arch/x86/kernel/irq.c:240
asm_common_interrupt+0x1e/0x40
ffs arch/x86/include/asm/bitops.h:297 [inline]
__do_softirq+0x1e3/0x7a3 kernel/softirq.c:546
__irq_exit_rcu+0xec/0x170 kernel/softirq.c:637
irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20
native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
acpi_safe_halt drivers/acpi/processor_idle.c:115 [inline]
acpi_idle_do_entry drivers/acpi/processor_idle.c:556 [inline]
acpi_idle_enter+0x42d/0x790 drivers/acpi/processor_idle.c:692
cpuidle_enter_state+0x507/0xea0 drivers/cpuidle/cpuidle.c:237
cpuidle_enter+0x59/0x90 drivers/cpuidle/cpuidle.c:351
call_cpuidle kernel/sched/idle.c:158 [inline]
cpuidle_idle_call kernel/sched/idle.c:239 [inline]
do_idle+0x3e8/0x670 kernel/sched/idle.c:306
cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:403
start_kernel+0x4bf/0x56e init/main.c:1138
secondary_startup_64_no_verify+0xc4/0xcb
-> #1 (&port_lock_key){-.-.}-{2:2}:
lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5639
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
serial8250_console_write+0x19c/0xf30 drivers/tty/serial/8250/8250_port.c:3351
console_unlock+0xb00/0xe90 kernel/printk/printk.c:2711
vprintk_emit+0xba/0x140 kernel/printk/printk.c:2245
_printk+0xcf/0x118 kernel/printk/printk.c:2266
register_console+0x72c/0xa20 kernel/printk/printk.c:3064
univ8250_console_init+0x41/0x43 drivers/tty/serial/8250/8250_core.c:679
console_init+0x52/0x97 kernel/printk/printk.c:3164
start_kernel+0x32d/0x56e init/main.c:1067
secondary_startup_64_no_verify+0xc4/0xcb
-> #0 (console_owner){-.-.}-{0:0}:
check_prev_add kernel/locking/lockdep.c:3063 [inline]
check_prevs_add kernel/locking/lockdep.c:3186 [inline]
validate_chain+0x1dfb/0x8250 kernel/locking/lockdep.c:3801
__lock_acquire+0x1382/0x2b00 kernel/locking/lockdep.c:5027
lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5639
console_lock_spinning_enable+0x52/0x60 kernel/printk/printk.c:1781
console_unlock+0x834/0xe90 kernel/printk/printk.c:2708
vprintk_emit+0xba/0x140 kernel/printk/printk.c:2245
_printk+0xcf/0x118 kernel/printk/printk.c:2266
fail_dump lib/fault-inject.c:45 [inline]
should_fail+0x366/0x4b0 lib/fault-inject.c:146
should_failslab+0x5/0x20 mm/slab_common.c:1304
slab_pre_alloc_hook mm/slab.h:707 [inline]
slab_alloc_node mm/slub.c:3144 [inline]
slab_alloc mm/slub.c:3238 [inline]
__kmalloc+0x94/0x380 mm/slub.c:4420
kmalloc include/linux/slab.h:586 [inline]
tty_buffer_alloc drivers/tty/tty_buffer.c:178 [inline]
__tty_buffer_request_room+0x1f0/0x540 drivers/tty/tty_buffer.c:274
tty_insert_flip_string_fixed_flag+0x92/0x2c0 drivers/tty/tty_buffer.c:321
tty_insert_flip_string include/linux/tty_flip.h:41 [inline]
pty_write+0xe9/0x170 drivers/tty/pty.c:122
tty_send_xchar+0x25e/0x4d0 drivers/tty/tty_io.c:1168
tty_ioctl+0xfec/0x1830 drivers/tty/tty_io.c:2787
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl+0xfb/0x170 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
other info that might help us debug this:
Chain exists of:
console_owner --> &port_lock_key --> &port->lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&port->lock);
lock(&port_lock_key);
lock(&port->lock);
lock(console_owner);
*** DEADLOCK ***
5 locks held by syz-executor.4/29521:
#0: ffff88804056a098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
#1: ffff88804056a130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: tty_write_lock drivers/tty/tty_io.c:950 [inline]
#1: ffff88804056a130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: tty_send_xchar+0x1a4/0x4d0 drivers/tty/tty_io.c:1162
#2: ffff88804056a2e8 (&o_tty->termios_rwsem/1){++++}-{3:3}, at: tty_send_xchar+0x1d1/0x4d0 drivers/tty/tty_io.c:1165
#3: ffff8880736f6158 (&port->lock){-.-.}-{2:2}, at: pty_write+0xc5/0x170 drivers/tty/pty.c:120
#4: ffffffff8c9f94a0 (console_lock){+.+.}-{0:0}, at: vprintk_emit+0xa1/0x140 kernel/printk/printk.c:2244
stack backtrace:
CPU: 1 PID: 29521 Comm: syz-executor.4 Not tainted 5.17.0-rc5-syzkaller-00006-g917bbdb107f8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1dc/0x2d8 lib/dump_stack.c:106
check_noncircular+0x2f9/0x3b0 kernel/locking/lockdep.c:2143
check_prev_add kernel/locking/lockdep.c:3063 [inline]
check_prevs_add kernel/locking/lockdep.c:3186 [inline]
validate_chain+0x1dfb/0x8250 kernel/locking/lockdep.c:3801
__lock_acquire+0x1382/0x2b00 kernel/locking/lockdep.c:5027
lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5639
console_lock_spinning_enable+0x52/0x60 kernel/printk/printk.c:1781
console_unlock+0x834/0xe90 kernel/printk/printk.c:2708
vprintk_emit+0xba/0x140 kernel/printk/printk.c:2245
_printk+0xcf/0x118 kernel/printk/printk.c:2266
fail_dump lib/fault-inject.c:45 [inline]
should_fail+0x366/0x4b0 lib/fault-inject.c:146
should_failslab+0x5/0x20 mm/slab_common.c:1304
slab_pre_alloc_hook mm/slab.h:707 [inline]
slab_alloc_node mm/slub.c:3144 [inline]
slab_alloc mm/slub.c:3238 [inline]
__kmalloc+0x94/0x380 mm/slub.c:4420
kmalloc include/linux/slab.h:586 [inline]
tty_buffer_alloc drivers/tty/tty_buffer.c:178 [inline]
__tty_buffer_request_room+0x1f0/0x540 drivers/tty/tty_buffer.c:274
tty_insert_flip_string_fixed_flag+0x92/0x2c0 drivers/tty/tty_buffer.c:321
tty_insert_flip_string include/linux/tty_flip.h:41 [inline]
pty_write+0xe9/0x170 drivers/tty/pty.c:122
tty_send_xchar+0x25e/0x4d0 drivers/tty/tty_io.c:1168
tty_ioctl+0xfec/0x1830 drivers/tty/tty_io.c:2787
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl+0xfb/0x170 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f55f3247059
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f55f1b9b168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f55f335a030 RCX: 00007f55f3247059
RDX: 0000000000000003 RSI: 000000000000540a RDI: 0000000000000003
RBP: 00007f55f1b9b1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fffde49e97f R14: 00007f55f1b9b300 R15: 0000000000022000
CPU: 1 PID: 29521 Comm: syz-executor.4 Not tainted 5.17.0-rc5-syzkaller-00006-g917bbdb107f8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1dc/0x2d8 lib/dump_stack.c:106
fail_dump lib/fault-inject.c:52 [inline]
should_fail+0x384/0x4b0 lib/fault-inject.c:146
should_failslab+0x5/0x20 mm/slab_common.c:1304
slab_pre_alloc_hook mm/slab.h:707 [inline]
slab_alloc_node mm/slub.c:3144 [inline]
slab_alloc mm/slub.c:3238 [inline]
__kmalloc+0x94/0x380 mm/slub.c:4420
kmalloc include/linux/slab.h:586 [inline]
tty_buffer_alloc drivers/tty/tty_buffer.c:178 [inline]
__tty_buffer_request_room+0x1f0/0x540 drivers/tty/tty_buffer.c:274
tty_insert_flip_string_fixed_flag+0x92/0x2c0 drivers/tty/tty_buffer.c:321
tty_insert_flip_string include/linux/tty_flip.h:41 [inline]
pty_write+0xe9/0x170 drivers/tty/pty.c:122
tty_send_xchar+0x25e/0x4d0 drivers/tty/tty_io.c:1168
tty_ioctl+0xfec/0x1830 drivers/tty/tty_io.c:2787
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl+0xfb/0x170 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f55f3247059
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f55f1b9b168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f55f335a030 RCX: 00007f55f3247059
RDX: 0000000000000003 RSI: 000000000000540a RDI: 0000000000000003
RBP: 00007f55f1b9b1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fffde49e97f R14: 00007f55f1b9b300 R15: 0000000000022000