FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
------------[ cut here ]------------
CPU: 1 PID: 23748 Comm: syz-executor1 Not tainted 4.20.0+ #1
downgrading a read lock
WARNING: CPU: 0 PID: 23751 at kernel/locking/lockdep.c:3553 __lock_downgrade kernel/locking/lockdep.c:3553 [inline]
WARNING: CPU: 0 PID: 23751 at kernel/locking/lockdep.c:3553 lock_downgrade+0x4d2/0x910 kernel/locking/lockdep.c:3816
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Kernel panic - not syncing: panic_on_warn set ...
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1db/0x2d0 lib/dump_stack.c:113
fail_dump lib/fault-inject.c:51 [inline]
should_fail.cold+0xa/0x15 lib/fault-inject.c:149
__should_failslab+0x121/0x190 mm/failslab.c:32
should_failslab+0x9/0x14 mm/slab_common.c:1603
slab_pre_alloc_hook mm/slab.h:423 [inline]
slab_alloc mm/slab.c:3365 [inline]
__do_kmalloc mm/slab.c:3707 [inline]
__kmalloc+0x71/0x740 mm/slab.c:3718
kmalloc include/linux/slab.h:550 [inline]
tty_buffer_alloc drivers/tty/tty_buffer.c:175 [inline]
__tty_buffer_request_room+0x2bf/0x7e0 drivers/tty/tty_buffer.c:273
tty_insert_flip_string_fixed_flag+0x93/0x1f0 drivers/tty/tty_buffer.c:318
tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
pty_write+0x133/0x200 drivers/tty/pty.c:122
n_tty_write+0xb9e/0x1220 drivers/tty/n_tty.c:2354
do_tty_write drivers/tty/tty_io.c:959 [inline]
tty_write+0x45b/0x7a0 drivers/tty/tty_io.c:1043
__vfs_write+0x116/0xb40 fs/read_write.c:485
vfs_write+0x20c/0x580 fs/read_write.c:549
ksys_write+0x105/0x260 fs/read_write.c:598
__do_sys_write fs/read_write.c:610 [inline]
__se_sys_write fs/read_write.c:607 [inline]
__x64_sys_write+0x73/0xb0 fs/read_write.c:607
do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457ec9
Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f2c73e1ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f2c73e1ac90 RCX: 0000000000457ec9
RDX: 00000000ffffff0b RSI: 0000000020c34fff RDI: 0000000000000003
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2c73e1b6d4
R13: 00000000004c3a3c R14: 00000000004dbbc0 R15: 0000000000000004
CPU: 0 PID: 23751 Comm: modprobe Not tainted 4.20.0+ #1
======================================================
WARNING: possible circular locking dependency detected
4.20.0+ #1 Not tainted
------------------------------------------------------
syz-executor1/23748 is trying to acquire lock:
00000000d21e0417 (console_owner){-.-.}, at: log_next kernel/printk/printk.c:492 [inline]
00000000d21e0417 (console_owner){-.-.}, at: console_unlock+0x4d3/0x11e0 kernel/printk/printk.c:2395
but task is already holding lock:
000000005d373c58 (&(&port->lock)->rlock){-.-.}, at: pty_write+0xff/0x200 drivers/tty/pty.c:120
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (&(&port->lock)->rlock){-.-.}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152
tty_port_tty_get+0x22/0x80 drivers/tty/tty_port.c:287
tty_port_default_wakeup+0x16/0x40 drivers/tty/tty_port.c:47
tty_port_tty_wakeup+0x5d/0x70 drivers/tty/tty_port.c:387
uart_write_wakeup+0x46/0x70 drivers/tty/serial/serial_core.c:103
serial8250_tx_chars+0x4a4/0xb20 drivers/tty/serial/8250/8250_port.c:1806
serial8250_handle_irq.part.0+0x1be/0x2e0 drivers/tty/serial/8250/8250_port.c:1879
serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1865 [inline]
serial8250_default_handle_irq+0xc5/0x150 drivers/tty/serial/8250/8250_port.c:1895
serial8250_interrupt+0xfb/0x1a0 drivers/tty/serial/8250/8250_core.c:125
__handle_irq_event_percpu+0x1c6/0xb10 kernel/irq/handle.c:149
handle_irq_event_percpu+0xa0/0x1d0 kernel/irq/handle.c:189
handle_irq_event+0xa7/0x134 kernel/irq/handle.c:206
handle_edge_irq+0x232/0x8a0 kernel/irq/chip.c:791
generic_handle_irq_desc include/linux/irqdesc.h:154 [inline]
handle_irq+0x252/0x3d8 arch/x86/kernel/irq_64.c:78
do_IRQ+0x99/0x1d0 arch/x86/kernel/irq.c:246
ret_from_intr+0x0/0x1e
native_safe_halt+0x2/0x10 arch/x86/include/asm/irqflags.h:57
arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:555
default_idle_call+0x36/0x90 kernel/sched/idle.c:93
cpuidle_idle_call kernel/sched/idle.c:153 [inline]
do_idle+0x386/0x5d0 kernel/sched/idle.c:262
cpu_startup_entry+0x1b/0x20 kernel/sched/idle.c:353
start_secondary+0x435/0x620 arch/x86/kernel/smpboot.c:271
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243
-> #1 (&port_lock_key){-.-.}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152
serial8250_console_write+0x253/0xab0 drivers/tty/serial/8250/8250_port.c:3245
univ8250_console_write+0x5f/0x70 drivers/tty/serial/8250/8250_core.c:586
call_console_drivers kernel/printk/printk.c:1737 [inline]
console_unlock+0xcff/0x11e0 kernel/printk/printk.c:2408
vprintk_emit+0x370/0x960 kernel/printk/printk.c:1931
vprintk_default+0x28/0x30 kernel/printk/printk.c:1958
vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398
printk+0xba/0xed kernel/printk/printk.c:1991
register_console+0x74d/0xb50 kernel/printk/printk.c:2723
univ8250_console_init+0x3e/0x4b drivers/tty/serial/8250/8250_core.c:681
console_init+0x6b7/0x9fe kernel/printk/printk.c:2809
start_kernel+0x5df/0x8bd init/main.c:668
x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:470
x86_64_start_kernel+0x77/0x7b arch/x86/kernel/head64.c:451
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243
-> #0 (console_owner){-.-.}:
lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3841
console_lock_spinning_enable kernel/printk/printk.c:1600 [inline]
console_unlock+0x53d/0x11e0 kernel/printk/printk.c:2405
vprintk_emit+0x370/0x960 kernel/printk/printk.c:1931
vprintk_default+0x28/0x30 kernel/printk/printk.c:1958
vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398
printk+0xba/0xed kernel/printk/printk.c:1991
fail_dump lib/fault-inject.c:44 [inline]
should_fail+0xa59/0xd22 lib/fault-inject.c:149
__should_failslab+0x121/0x190 mm/failslab.c:32
should_failslab+0x9/0x14 mm/slab_common.c:1603
slab_pre_alloc_hook mm/slab.h:423 [inline]
slab_alloc mm/slab.c:3365 [inline]
__do_kmalloc mm/slab.c:3707 [inline]
__kmalloc+0x71/0x740 mm/slab.c:3718
kmalloc include/linux/slab.h:550 [inline]
tty_buffer_alloc drivers/tty/tty_buffer.c:175 [inline]
__tty_buffer_request_room+0x2bf/0x7e0 drivers/tty/tty_buffer.c:273
tty_insert_flip_string_fixed_flag+0x93/0x1f0 drivers/tty/tty_buffer.c:318
tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
pty_write+0x133/0x200 drivers/tty/pty.c:122
n_tty_write+0xb9e/0x1220 drivers/tty/n_tty.c:2354
do_tty_write drivers/tty/tty_io.c:959 [inline]
tty_write+0x45b/0x7a0 drivers/tty/tty_io.c:1043
__vfs_write+0x116/0xb40 fs/read_write.c:485
vfs_write+0x20c/0x580 fs/read_write.c:549
ksys_write+0x105/0x260 fs/read_write.c:598
__do_sys_write fs/read_write.c:610 [inline]
__se_sys_write fs/read_write.c:607 [inline]
__x64_sys_write+0x73/0xb0 fs/read_write.c:607
do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
other info that might help us debug this:
Chain exists of:
console_owner --> &port_lock_key --> &(&port->lock)->rlock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&(&port->lock)->rlock);
lock(&port_lock_key);
lock(&(&port->lock)->rlock);
lock(console_owner);
*** DEADLOCK ***
6 locks held by syz-executor1/23748:
#0: 000000003242d5b6 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
#1: 00000000b944a46b (&tty->atomic_write_lock){+.+.}, at: tty_write_lock+0x23/0x90 drivers/tty/tty_io.c:885
#2: 0000000041a97d53 (&tty->termios_rwsem){++++}, at: n_tty_write+0x246/0x1220 drivers/tty/n_tty.c:2314
#3: 00000000b723cb7f (&ldata->output_lock){+.+.}, at: n_tty_write+0xb59/0x1220 drivers/tty/n_tty.c:2353
#4: 000000005d373c58 (&(&port->lock)->rlock){-.-.}, at: pty_write+0xff/0x200 drivers/tty/pty.c:120
#5: 0000000028f85a27 (console_lock){+.+.}, at: console_trylock_spinning kernel/printk/printk.c:1662 [inline]
#5: 0000000028f85a27 (console_lock){+.+.}, at: vprintk_emit+0x351/0x960 kernel/printk/printk.c:1930
stack backtrace:
CPU: 1 PID: 23748 Comm: syz-executor1 Not tainted 4.20.0+ #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1db/0x2d0 lib/dump_stack.c:113
print_circular_bug.isra.0.cold+0x1cc/0x28f kernel/locking/lockdep.c:1224
check_prev_add kernel/locking/lockdep.c:1866 [inline]
check_prevs_add kernel/locking/lockdep.c:1979 [inline]
validate_chain kernel/locking/lockdep.c:2350 [inline]
__lock_acquire+0x3014/0x4a30 kernel/locking/lockdep.c:3338
lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3841
console_lock_spinning_enable kernel/printk/printk.c:1600 [inline]
console_unlock+0x53d/0x11e0 kernel/printk/printk.c:2405
vprintk_emit+0x370/0x960 kernel/printk/printk.c:1931
vprintk_default+0x28/0x30 kernel/printk/printk.c:1958
vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398
printk+0xba/0xed kernel/printk/printk.c:1991
fail_dump lib/fault-inject.c:44 [inline]
should_fail+0xa59/0xd22 lib/fault-inject.c:149
__should_failslab+0x121/0x190 mm/failslab.c:32
should_failslab+0x9/0x14 mm/slab_common.c:1603
slab_pre_alloc_hook mm/slab.h:423 [inline]
slab_alloc mm/slab.c:3365 [inline]
__do_kmalloc mm/slab.c:3707 [inline]
__kmalloc+0x71/0x740 mm/slab.c:3718
kmalloc include/linux/slab.h:550 [inline]
tty_buffer_alloc drivers/tty/tty_buffer.c:175 [inline]
__tty_buffer_request_room+0x2bf/0x7e0 drivers/tty/tty_buffer.c:273
tty_insert_flip_string_fixed_flag+0x93/0x1f0 drivers/tty/tty_buffer.c:318
tty_insert_flip_string include/linux/tty_flip.h:37 [inline]
pty_write+0x133/0x200 drivers/tty/pty.c:122
n_tty_write+0xb9e/0x1220 drivers/tty/n_tty.c:2354
do_tty_write drivers/tty/tty_io.c:959 [inline]
tty_write+0x45b/0x7a0 drivers/tty/tty_io.c:1043
__vfs_write+0x116/0xb40 fs/read_write.c:485
vfs_write+0x20c/0x580 fs/read_write.c:549
ksys_write+0x105/0x260 fs/read_write.c:598
__do_sys_write fs/read_write.c:610 [inline]
__se_sys_write fs/read_write.c:607 [inline]
__x64_sys_write+0x73/0xb0 fs/read_write.c:607
do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457ec9
Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f2c73e1ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f2c73e1ac90 RCX: 0000000000457ec9
RDX: 00000000ffffff0b RSI: 0000000020c34fff RDI: 0000000000000003
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2c73e1b6d4
R13: 00000000004c3a3c R14: 00000000004dbbc0 R15: 0000000000000004
binder: 23753:23757 got transaction with invalid offset (0, min 0 max 0) or object.
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1db/0x2d0 lib/dump_stack.c:113
binder: 23753:23757 transaction failed 29201/-22, size 0-8 line 3097
panic+0x2cb/0x589 kernel/panic.c:189
binder: undelivered TRANSACTION_ERROR: 29201
__warn.cold+0x20/0x4b kernel/panic.c:544
report_bug+0x263/0x2b0 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:178 [inline]
fixup_bug arch/x86/kernel/traps.c:173 [inline]
do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:290
invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973
RIP: 0010:__lock_downgrade kernel/locking/lockdep.c:3553 [inline]
RIP: 0010:lock_downgrade+0x4d2/0x910 kernel/locking/lockdep.c:3816
Code: 00 00 00 fc ff df 41 c6 04 06 f8 e9 1f ff ff ff 48 c7 c7 20 9e 4b 88 4c 89 8d 58 ff ff ff 48 89 85 60 ff ff ff e8 2e 1b e7 ff <0f> 0b 48 8b 85 60 ff ff ff 4c 8d 5d d8 4c 89 f1 48 ba 00 00 00 00
RSP: 0018:ffff88804dd07bb8 EFLAGS: 00010082
RAX: 0000000000000000 RBX: 1ffff11009ba0f7d RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8167dbb6 RDI: 0000000000000006
RBP: ffff88804dd07c70 R08: ffff8880586445c0 R09: fffffbfff1332979
R10: fffffbfff1332978 R11: ffffffff89994bc3 R12: ffff8880586445c0
R13: ffffffff8b55b960 R14: ffff88804dd07c08 R15: 0000000000000001
downgrade_write+0x76/0x270 kernel/locking/rwsem.c:147
__do_munmap+0xc33/0xed0 mm/mmap.c:2823
__vm_munmap+0x139/0x1f0 mm/mmap.c:2848
__do_sys_munmap mm/mmap.c:2873 [inline]
__se_sys_munmap mm/mmap.c:2870 [inline]
__x64_sys_munmap+0x67/0x80 mm/mmap.c:2870
do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7feb4db49d37
Code: f0 ff ff 73 01 c3 48 8b 0d fe c0 2a 00 31 d2 48 29 c2 64 89 11 48 83 c8 ff eb ea 90 90 90 90 90 90 90 90 b8 0b 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d d1 c0 2a 00 31 d2 48 29 c2 64
RSP: 002b:00007ffe70f40a18 EFLAGS: 00000206 ORIG_RAX: 000000000000000b
RAX: ffffffffffffffda RBX: 000055712e92d250 RCX: 00007feb4db49d37
RDX: 0000000000000000 RSI: 0000000000001000 RDI: 00007feb4e22e000
RBP: 0000000000000000 R08: 00007feb4e229700 R09: 00007feb4db94090
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 000055712e935200 R14: 000055712e92d200 R15: 00007ffe70f40ca0
Kernel Offset: disabled
Rebooting in 86400 seconds..