FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
======================================================
WARNING: possible circular locking dependency detected
5.16.0-rc4-next-20211208 #1 Not tainted
------------------------------------------------------
syz-executor.4/6818 is trying to acquire lock:
ffffffff85114920 (console_owner){-.-.}-{0:0}, at: console_unlock+0x2f4/0xae0 kernel/printk/printk.c:2710
but task is already holding lock:
ffff888042732958 (&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
native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
default_idle+0xb/0x10 arch/x86/kernel/process.c:733
default_idle_call+0x87/0xd0 kernel/sched/idle.c:112
cpuidle_idle_call kernel/sched/idle.c:194 [inline]
do_idle+0x3b9/0x530 kernel/sched/idle.c:306
cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:403
secondary_startup_64_no_verify+0xd5/0xdb
-> #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+0x90e/0xb20 drivers/tty/serial/8250/8250_port.c:3351
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:680
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:741 [inline]
slab_alloc_node mm/slub.c:3145 [inline]
slab_alloc mm/slub.c:3239 [inline]
__kmalloc+0x72/0x330 mm/slub.c:4419
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
process_output_block drivers/tty/n_tty.c:581 [inline]
n_tty_write+0x416/0xfe0 drivers/tty/n_tty.c:2250
do_tty_write drivers/tty/tty_io.c:1027 [inline]
file_tty_write.constprop.0+0x529/0x910 drivers/tty/tty_io.c:1098
call_write_iter include/linux/fs.h:2079 [inline]
new_sync_write+0x42f/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.4/6818:
#0: ffff888038b2e098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244
#1: ffff888038b2e130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: tty_write_lock drivers/tty/tty_io.c:950 [inline]
#1: ffff888038b2e130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: do_tty_write drivers/tty/tty_io.c:973 [inline]
#1: ffff888038b2e130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: file_tty_write.constprop.0+0x29f/0x910 drivers/tty/tty_io.c:1098
#2: ffff888038b2e2e8 (&o_tty->termios_rwsem/1){++++}-{3:3}, at: n_tty_write+0x1bf/0xfe0 drivers/tty/n_tty.c:2233
#3: ffffc9000fe3f378 (&ldata->output_lock){+.+.}-{3:3}, at: process_output_block drivers/tty/n_tty.c:536 [inline]
#3: ffffc9000fe3f378 (&ldata->output_lock){+.+.}-{3:3}, at: n_tty_write+0x542/0xfe0 drivers/tty/n_tty.c:2250
#4: ffff888042732958 (&port->lock){-.-.}-{2:2}, at: pty_write+0xea/0x1e0 drivers/tty/pty.c:120
#5: ffffffff851f4d60 (console_lock){+.+.}-{0:0}, at: vprintk+0x80/0x90 kernel/printk/printk_safe.c:50
stack backtrace:
CPU: 1 PID: 6818 Comm: syz-executor.4 Not tainted 5.16.0-rc4-next-20211208 #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:741 [inline]
slab_alloc_node mm/slub.c:3145 [inline]
slab_alloc mm/slub.c:3239 [inline]
__kmalloc+0x72/0x330 mm/slub.c:4419
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
process_output_block drivers/tty/n_tty.c:581 [inline]
n_tty_write+0x416/0xfe0 drivers/tty/n_tty.c:2250
do_tty_write drivers/tty/tty_io.c:1027 [inline]
file_tty_write.constprop.0+0x529/0x910 drivers/tty/tty_io.c:1098
call_write_iter include/linux/fs.h:2079 [inline]
new_sync_write+0x42f/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: 0033:0x7f52837c5b19
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:00007f5280d3b188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f52838d8f60 RCX: 00007f52837c5b19
RDX: 0000000000000758 RSI: 0000000020000100 RDI: 0000000000000004
RBP: 00007f5280d3b1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffea80797af R14: 00007f5280d3b300 R15: 0000000000022000
CPU: 1 PID: 6818 Comm: syz-executor.4 Not tainted 5.16.0-rc4-next-20211208 #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:741 [inline]
slab_alloc_node mm/slub.c:3145 [inline]
slab_alloc mm/slub.c:3239 [inline]
__kmalloc+0x72/0x330 mm/slub.c:4419
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
process_output_block drivers/tty/n_tty.c:581 [inline]
n_tty_write+0x416/0xfe0 drivers/tty/n_tty.c:2250
do_tty_write drivers/tty/tty_io.c:1027 [inline]
file_tty_write.constprop.0+0x529/0x910 drivers/tty/tty_io.c:1098
call_write_iter include/linux/fs.h:2079 [inline]
new_sync_write+0x42f/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: 0033:0x7f52837c5b19
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:00007f5280d3b188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f52838d8f60 RCX: 00007f52837c5b19
RDX: 0000000000000758 RSI: 0000000020000100 RDI: 0000000000000004
RBP: 00007f5280d3b1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffea80797af R14: 00007f5280d3b300 R15: 0000000000022000
EXT4-fs (loop5): VFS: Can't find ext4 filesystem
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 PID: 6845 Comm: syz-executor.4 Not tainted 5.16.0-rc4-next-20211208 #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:741 [inline]
slab_alloc_node mm/slub.c:3145 [inline]
slab_alloc mm/slub.c:3239 [inline]
kmem_cache_alloc+0x5b/0x480 mm/slub.c:3244
mem_pool_alloc mm/kmemleak.c:430 [inline]
create_object.isra.0+0x3a/0xa20 mm/kmemleak.c:586
kmemleak_alloc_recursive include/linux/kmemleak.h:43 [inline]
slab_post_alloc_hook mm/slab.h:769 [inline]
slab_alloc_node mm/slub.c:3231 [inline]
slab_alloc mm/slub.c:3239 [inline]
__kmalloc+0x1ed/0x330 mm/slub.c:4419
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
process_output_block drivers/tty/n_tty.c:581 [inline]
n_tty_write+0x416/0xfe0 drivers/tty/n_tty.c:2250
do_tty_write drivers/tty/tty_io.c:1027 [inline]
file_tty_write.constprop.0+0x529/0x910 drivers/tty/tty_io.c:1098
call_write_iter include/linux/fs.h:2079 [inline]
new_sync_write+0x42f/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: 0033:0x7f52837c5b19
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:00007f5280d3b188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f52838d8f60 RCX: 00007f52837c5b19
RDX: 0000000000000758 RSI: 0000000020000100 RDI: 0000000000000004
RBP: 00007f5280d3b1d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffea80797af R14: 00007f5280d3b300 R15: 0000000000022000
loop5: detected capacity change from 0 to 4
EXT4-fs (loop5): VFS: Can't find ext4 filesystem