FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
======================================================
WARNING: possible circular locking dependency detected
5.16.0-next-20220113 #1 Not tainted
------------------------------------------------------
syz-executor.4/8270 is trying to acquire lock:
ffffffff85114c20 (console_owner){-.-.}-{0:0}, at: console_unlock+0x2f4/0xae0 kernel/printk/printk.c:2710
but task is already holding lock:
ffff888034f94158 (&port->lock){-.-.}-{2:2}, at: pty_write+0xea/0x1e0 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}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162
tty_port_tty_get+0x1f/0x100 drivers/tty/tty_port.c:305
tty_port_default_wakeup+0x11/0x40 drivers/tty/tty_port.c:48
serial8250_tx_chars+0x50b/0xb00 drivers/tty/serial/8250/8250_port.c:1845
serial8250_handle_irq.part.0+0x3f1/0x4c0 drivers/tty/serial/8250/8250_port.c:1932
serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1905 [inline]
serial8250_default_handle_irq+0xb8/0x230 drivers/tty/serial/8250/8250_port.c:1949
serial8250_interrupt+0xf4/0x1a0 drivers/tty/serial/8250/8250_core.c:126
__handle_irq_event_percpu+0x20f/0x820 kernel/irq/handle.c:158
handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
handle_irq_event+0xa7/0x1e0 kernel/irq/handle.c:210
handle_edge_irq+0x262/0xd10 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+0x92/0x1d0 arch/x86/kernel/irq.c:250
common_interrupt+0x9f/0xc0 arch/x86/kernel/irq.c:240
asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:629
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
_raw_spin_unlock_irqrestore+0x2e/0x50 kernel/locking/spinlock.c:194
spin_unlock_irqrestore include/linux/spinlock.h:409 [inline]
uart_write+0x304/0x580 drivers/tty/serial/serial_core.c:598
do_output_char+0x5e4/0x860 drivers/tty/n_tty.c:435
process_output drivers/tty/n_tty.c:501 [inline]
n_tty_write+0x4c9/0xfe0 drivers/tty/n_tty.c:2262
do_tty_write drivers/tty/tty_io.c:1024 [inline]
file_tty_write.constprop.0+0x529/0x910 drivers/tty/tty_io.c:1095
redirected_tty_write+0xa1/0xc0 drivers/tty/tty_io.c:1116
call_write_iter include/linux/fs.h:2074 [inline]
do_iter_readv_writev+0x481/0x760 fs/read_write.c:725
do_iter_write+0x18d/0x700 fs/read_write.c:851
vfs_writev+0x1aa/0x630 fs/read_write.c:924
do_writev+0x139/0x300 fs/read_write.c:967
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
-> #1 (&port_lock_key){-.-.}-{2:2}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162
serial8250_console_write+0xbe4/0xe30 drivers/tty/serial/8250/8250_port.c:3387
call_console_drivers kernel/printk/printk.c:1932 [inline]
console_unlock+0x756/0xae0 kernel/printk/printk.c:2714
register_console kernel/printk/printk.c:3057 [inline]
register_console+0x378/0x7d0 kernel/printk/printk.c:2948
univ8250_console_init+0x3a/0x46 drivers/tty/serial/8250/8250_core.c:679
console_init+0x3c9/0x599 kernel/printk/printk.c:3167
start_kernel+0x301/0x4a5 init/main.c:1070
secondary_startup_64_no_verify+0xd5/0xdb
-> #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 kernel/locking/lockdep.c:3801 [inline]
__lock_acquire+0x2a14/0x5b70 kernel/locking/lockdep.c:5027
lock_acquire kernel/locking/lockdep.c:5639 [inline]
lock_acquire+0x1a2/0x4d0 kernel/locking/lockdep.c:5604
console_lock_spinning_enable kernel/printk/printk.c:1784 [inline]
console_unlock+0x347/0xae0 kernel/printk/printk.c:2711
vprintk_emit+0x198/0x450 kernel/printk/printk.c:2248
vprintk+0x80/0x90 kernel/printk/printk_safe.c:50
_printk+0xba/0xed kernel/printk/printk.c:2269
fail_dump lib/fault-inject.c:45 [inline]
should_fail+0x472/0x5a0 lib/fault-inject.c:146
should_failslab+0x5/0x10 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+0x72/0x440 mm/slub.c:4420
kmalloc include/linux/slab.h:586 [inline]
tty_buffer_alloc+0x23f/0x2a0 drivers/tty/tty_buffer.c:178
__tty_buffer_request_room+0x156/0x2a0 drivers/tty/tty_buffer.c:274
tty_insert_flip_string_fixed_flag+0x91/0x250 drivers/tty/tty_buffer.c:321
tty_insert_flip_string include/linux/tty_flip.h:41 [inline]
pty_write+0x11c/0x1e0 drivers/tty/pty.c:122
n_tty_write+0xa86/0xfe0 drivers/tty/n_tty.c:2273
do_tty_write drivers/tty/tty_io.c:1024 [inline]
file_tty_write.constprop.0+0x529/0x910 drivers/tty/tty_io.c:1095
call_write_iter include/linux/fs.h:2074 [inline]
new_sync_write+0x437/0x660 fs/read_write.c:503
vfs_write+0x7d1/0xae0 fs/read_write.c:590
ksys_write+0x12d/0x250 fs/read_write.c:643
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0x90 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 ***
6 locks held by syz-executor.4/8270:
#0: ffff88804469c098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244
#1: ffff88804469c130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: tty_write_lock drivers/tty/tty_io.c:950 [inline]
#1: ffff88804469c130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: do_tty_write drivers/tty/tty_io.c:973 [inline]
#1: ffff88804469c130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: file_tty_write.constprop.0+0x29f/0x910 drivers/tty/tty_io.c:1095
#2: ffff88804469c2e8 (&o_tty->termios_rwsem/1){++++}-{3:3}, at: n_tty_write+0x1bf/0xfe0 drivers/tty/n_tty.c:2233
#3: ffffc90000751378 (&ldata->output_lock){+.+.}-{3:3}, at: n_tty_write+0xa4d/0xfe0 drivers/tty/n_tty.c:2272
#4: ffff888034f94158 (&port->lock){-.-.}-{2:2}, at: pty_write+0xea/0x1e0 drivers/tty/pty.c:120
#5: ffffffff851f5060 (console_lock){+.+.}-{0:0}, at: vprintk+0x80/0x90 kernel/printk/printk_safe.c:50
stack backtrace:
CPU: 1 PID: 8270 Comm: syz-executor.4 Not tainted 5.16.0-next-20220113 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x8b/0xb3 lib/dump_stack.c:106
check_noncircular+0x25f/0x2e0 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 kernel/locking/lockdep.c:3801 [inline]
__lock_acquire+0x2a14/0x5b70 kernel/locking/lockdep.c:5027
lock_acquire kernel/locking/lockdep.c:5639 [inline]
lock_acquire+0x1a2/0x4d0 kernel/locking/lockdep.c:5604
console_lock_spinning_enable kernel/printk/printk.c:1784 [inline]
console_unlock+0x347/0xae0 kernel/printk/printk.c:2711
vprintk_emit+0x198/0x450 kernel/printk/printk.c:2248
vprintk+0x80/0x90 kernel/printk/printk_safe.c:50
_printk+0xba/0xed kernel/printk/printk.c:2269
fail_dump lib/fault-inject.c:45 [inline]
should_fail+0x472/0x5a0 lib/fault-inject.c:146
should_failslab+0x5/0x10 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+0x72/0x440 mm/slub.c:4420
kmalloc include/linux/slab.h:586 [inline]
tty_buffer_alloc+0x23f/0x2a0 drivers/tty/tty_buffer.c:178
__tty_buffer_request_room+0x156/0x2a0 drivers/tty/tty_buffer.c:274
tty_insert_flip_string_fixed_flag+0x91/0x250 drivers/tty/tty_buffer.c:321
tty_insert_flip_string include/linux/tty_flip.h:41 [inline]
pty_write+0x11c/0x1e0 drivers/tty/pty.c:122
n_tty_write+0xa86/0xfe0 drivers/tty/n_tty.c:2273
do_tty_write drivers/tty/tty_io.c:1024 [inline]
file_tty_write.constprop.0+0x529/0x910 drivers/tty/tty_io.c:1095
call_write_iter include/linux/fs.h:2074 [inline]
new_sync_write+0x437/0x660 fs/read_write.c:503
vfs_write+0x7d1/0xae0 fs/read_write.c:590
ksys_write+0x12d/0x250 fs/read_write.c:643
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f9f00712b19
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9efdc88188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f9f00825f60 RCX: 00007f9f00712b19
RDX: 00000000fffffecb RSI: 00000000200001c0 RDI: 0000000000000004
RBP: 00007f9efdc881d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fffaee094ff R14: 00007f9efdc88300 R15: 0000000000022000
CPU: 1 PID: 8270 Comm: syz-executor.4 Not tainted 5.16.0-next-20220113 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x8b/0xb3 lib/dump_stack.c:106
fail_dump lib/fault-inject.c:52 [inline]
should_fail.cold+0x5/0xa lib/fault-inject.c:146
should_failslab+0x5/0x10 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+0x72/0x440 mm/slub.c:4420
kmalloc include/linux/slab.h:586 [inline]
tty_buffer_alloc+0x23f/0x2a0 drivers/tty/tty_buffer.c:178
__tty_buffer_request_room+0x156/0x2a0 drivers/tty/tty_buffer.c:274
tty_insert_flip_string_fixed_flag+0x91/0x250 drivers/tty/tty_buffer.c:321
tty_insert_flip_string include/linux/tty_flip.h:41 [inline]
pty_write+0x11c/0x1e0 drivers/tty/pty.c:122
n_tty_write+0xa86/0xfe0 drivers/tty/n_tty.c:2273
do_tty_write drivers/tty/tty_io.c:1024 [inline]
file_tty_write.constprop.0+0x529/0x910 drivers/tty/tty_io.c:1095
call_write_iter include/linux/fs.h:2074 [inline]
new_sync_write+0x437/0x660 fs/read_write.c:503
vfs_write+0x7d1/0xae0 fs/read_write.c:590
ksys_write+0x12d/0x250 fs/read_write.c:643
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0x90 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f9f00712b19
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9efdc88188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f9f00825f60 RCX: 00007f9f00712b19
RDX: 00000000fffffecb RSI: 00000000200001c0 RDI: 0000000000000004
RBP: 00007f9efdc881d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fffaee094ff R14: 00007f9efdc88300 R15: 0000000000022000
loop3: detected capacity change from 0 to 12
program syz-executor.2 is using a deprecated SCSI ioctl, please convert it to SG_IO
program syz-executor.0 is using a deprecated SCSI ioctl, please convert it to SG_IO
loop3: detected capacity change from 0 to 264192
program syz-executor.0 is using a deprecated SCSI ioctl, please convert it to SG_IO
program syz-executor.2 is using a deprecated SCSI ioctl, please convert it to SG_IO
program syz-executor.0 is using a deprecated SCSI ioctl, please convert it to SG_IO
9pnet_fd: p9_fd_create_tcp (8290): problem connecting socket to 127.0.0.1
loop3: detected capacity change from 0 to 12
program syz-executor.0 is using a deprecated SCSI ioctl, please convert it to SG_IO
program syz-executor.0 is using a deprecated SCSI ioctl, please convert it to SG_IO
9pnet_fd: p9_fd_create_tcp (8290): problem connecting socket to 127.0.0.1
program syz-executor.0 is using a deprecated SCSI ioctl, please convert it to SG_IO
loop3: detected capacity change from 0 to 264192