audit: type=1800 audit(1592388337.164:90): pid=31524 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor.5" name="file0" dev="sda1" ino=16119 res=0
======================================================
WARNING: possible circular locking dependency detected
4.14.184-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.5/31539 is trying to acquire lock:
(&pool->lock/1){..-.}, at: [<ffffffff813ad654>] spin_lock include/linux/spinlock.h:317 [inline]
(&pool->lock/1){..-.}, at: [<ffffffff813ad654>] __queue_work+0x174/0xf70 kernel/workqueue.c:1421
but task is already holding lock:
(&(&port->lock)->rlock){-.-.}, at: [<ffffffff833c899b>] pty_write+0xdb/0x1c0 drivers/tty/pty.c:120
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #4 (&(&port->lock)->rlock){-.-.}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x8c/0xc0 kernel/locking/spinlock.c:160
tty_port_tty_get+0x1d/0x80 drivers/tty/tty_port.c:288
tty_port_default_wakeup+0x11/0x40 drivers/tty/tty_port.c:46
serial8250_tx_chars+0x400/0x9f0 drivers/tty/serial/8250/8250_port.c:1810
serial8250_handle_irq.part.0+0x1f8/0x240 drivers/tty/serial/8250/8250_port.c:1883
serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1869 [inline]
serial8250_default_handle_irq+0x96/0x110 drivers/tty/serial/8250/8250_port.c:1899
serial8250_interrupt+0xe4/0x1a0 drivers/tty/serial/8250/8250_core.c:129
__handle_irq_event_percpu+0xee/0x7f0 kernel/irq/handle.c:147
handle_irq_event_percpu+0x66/0x120 kernel/irq/handle.c:187
handle_irq_event+0xa2/0x12d kernel/irq/handle.c:204
handle_edge_irq+0x215/0x810 kernel/irq/chip.c:770
generic_handle_irq_desc include/linux/irqdesc.h:159 [inline]
handle_irq+0x35/0x50 arch/x86/kernel/irq_64.c:87
do_IRQ+0x93/0x1d0 arch/x86/kernel/irq.c:230
ret_from_intr+0x0/0x1e
native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60
arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline]
default_idle+0x47/0x370 arch/x86/kernel/process.c:566
cpuidle_idle_call kernel/sched/idle.c:156 [inline]
do_idle+0x250/0x3c0 kernel/sched/idle.c:246
cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:351
start_kernel+0x751/0x771 init/main.c:708
secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240
-> #3 (&port_lock_key){-.-.}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x8c/0xc0 kernel/locking/spinlock.c:160
serial8250_console_write+0x6ea/0x8e0 drivers/tty/serial/8250/8250_port.c:3236
call_console_drivers kernel/printk/printk.c:1725 [inline]
console_unlock+0x985/0xee0 kernel/printk/printk.c:2397
vprintk_emit+0x3b8/0x600 kernel/printk/printk.c:1923
vprintk_func+0x58/0x152 kernel/printk/printk_safe.c:401
printk+0x9e/0xbc kernel/printk/printk.c:1996
register_console+0x6ef/0xac0 kernel/printk/printk.c:2716
univ8250_console_init+0x2f/0x3a drivers/tty/serial/8250/8250_core.c:691
console_init+0x46/0x53 kernel/printk/printk.c:2797
start_kernel+0x52f/0x771 init/main.c:634
secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240
-> #2 (console_owner){-.-.}:
console_lock_spinning_enable kernel/printk/printk.c:1588 [inline]
console_unlock+0x36c/0xee0 kernel/printk/printk.c:2394
vprintk_emit+0x3b8/0x600 kernel/printk/printk.c:1923
vprintk_func+0x58/0x152 kernel/printk/printk_safe.c:401
printk+0x9e/0xbc kernel/printk/printk.c:1996
fail_dump lib/fault-inject.c:44 [inline]
should_fail.cold+0xdf/0x154 lib/fault-inject.c:149
should_failslab+0xd6/0x130 mm/failslab.c:32
slab_pre_alloc_hook mm/slab.h:421 [inline]
slab_alloc mm/slab.c:3376 [inline]
kmem_cache_alloc+0x40/0x3c0 mm/slab.c:3550
kmem_cache_zalloc include/linux/slab.h:651 [inline]
fill_pool lib/debugobjects.c:110 [inline]
__debug_object_init+0x57d/0x7a0 lib/debugobjects.c:341
__init_work kernel/workqueue.c:504 [inline]
insert_wq_barrier kernel/workqueue.c:2500 [inline]
start_flush_work kernel/workqueue.c:2848 [inline]
flush_work+0x1f7/0x780 kernel/workqueue.c:2892
snd_seq_client_use_ptr+0x2aa/0x330 sound/core/seq/seq_clientmgr.c:164
snd_seq_info_clients_read+0x146/0x705 sound/core/seq/seq_clientmgr.c:2466
snd_info_seq_show+0xc5/0x110 sound/core/info.c:378
seq_read+0x4d2/0x1130 fs/seq_file.c:237
proc_reg_read+0xf2/0x160 fs/proc/inode.c:217
do_loop_readv_writev fs/read_write.c:695 [inline]
do_loop_readv_writev fs/read_write.c:682 [inline]
do_iter_read+0x3e3/0x5a0 fs/read_write.c:919
vfs_readv+0xd3/0x130 fs/read_write.c:981
do_preadv+0x161/0x200 fs/read_write.c:1065
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
-> #1 (&(&pool->lock)->rlock){-.-.}:
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:152
spin_lock include/linux/spinlock.h:317 [inline]
__queue_work+0x174/0xf70 kernel/workqueue.c:1421
queue_work_on+0x159/0x1d0 kernel/workqueue.c:1490
queue_work include/linux/workqueue.h:491 [inline]
schedule_work include/linux/workqueue.h:549 [inline]
put_pwq kernel/workqueue.c:1092 [inline]
put_pwq+0x129/0x180 kernel/workqueue.c:1077
put_pwq_unlocked.part.0+0x30/0x70 kernel/workqueue.c:1109
put_pwq_unlocked kernel/workqueue.c:1103 [inline]
destroy_workqueue+0x570/0x660 kernel/workqueue.c:4173
do_floppy_init drivers/block/floppy.c:4732 [inline]
floppy_async_init+0x1ba8/0x1cf3 drivers/block/floppy.c:4749
async_run_entry_fn+0x102/0x4c0 kernel/async.c:127
process_one_work+0x7c0/0x14c0 kernel/workqueue.c:2116
worker_thread+0x5d7/0x1080 kernel/workqueue.c:2250
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
-> #0 (&pool->lock/1){..-.}:
lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:152
spin_lock include/linux/spinlock.h:317 [inline]
__queue_work+0x174/0xf70 kernel/workqueue.c:1421
queue_work_on+0x159/0x1d0 kernel/workqueue.c:1490
pty_write+0x173/0x1c0 drivers/tty/pty.c:125
tty_put_char+0xfe/0x120 drivers/tty/tty_io.c:2880
do_output_char+0x126/0x750 drivers/tty/n_tty.c:488
__process_echoes+0x313/0x8c0 drivers/tty/n_tty.c:739
flush_echoes drivers/tty/n_tty.c:829 [inline]
__receive_buf drivers/tty/n_tty.c:1648 [inline]
n_tty_receive_buf_common+0x940/0x2490 drivers/tty/n_tty.c:1742
tiocsti drivers/tty/tty_io.c:2186 [inline]
tty_ioctl+0xd5f/0x1220 drivers/tty/tty_io.c:2572
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x75a/0xfe0 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
other info that might help us debug this:
Chain exists of:
&pool->lock/1 --> &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(&pool->lock/1);
*** DEADLOCK ***
4 locks held by syz-executor.5/31539:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffff833bd922>] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284
#1: (&o_tty->termios_rwsem/1){++++}, at: [<ffffffff833b63f1>] n_tty_receive_buf_common+0x81/0x2490 drivers/tty/n_tty.c:1705
#2: (&ldata->output_lock){+.+.}, at: [<ffffffff833b6c72>] flush_echoes drivers/tty/n_tty.c:827 [inline]
#2: (&ldata->output_lock){+.+.}, at: [<ffffffff833b6c72>] __receive_buf drivers/tty/n_tty.c:1648 [inline]
#2: (&ldata->output_lock){+.+.}, at: [<ffffffff833b6c72>] n_tty_receive_buf_common+0x902/0x2490 drivers/tty/n_tty.c:1742
#3: (&(&port->lock)->rlock){-.-.}, at: [<ffffffff833c899b>] pty_write+0xdb/0x1c0 drivers/tty/pty.c:120
stack backtrace:
CPU: 1 PID: 31539 Comm: syz-executor.5 Not tainted 4.14.184-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x1b2/0x283 lib/dump_stack.c:58
print_circular_bug.isra.0.cold+0x2dc/0x425 kernel/locking/lockdep.c:1258
check_prev_add kernel/locking/lockdep.c:1905 [inline]
check_prevs_add kernel/locking/lockdep.c:2022 [inline]
validate_chain kernel/locking/lockdep.c:2464 [inline]
__lock_acquire+0x3057/0x42a0 kernel/locking/lockdep.c:3491
lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:152
spin_lock include/linux/spinlock.h:317 [inline]
__queue_work+0x174/0xf70 kernel/workqueue.c:1421
queue_work_on+0x159/0x1d0 kernel/workqueue.c:1490
pty_write+0x173/0x1c0 drivers/tty/pty.c:125
tty_put_char+0xfe/0x120 drivers/tty/tty_io.c:2880
do_output_char+0x126/0x750 drivers/tty/n_tty.c:488
__process_echoes+0x313/0x8c0 drivers/tty/n_tty.c:739
flush_echoes drivers/tty/n_tty.c:829 [inline]
__receive_buf drivers/tty/n_tty.c:1648 [inline]
n_tty_receive_buf_common+0x940/0x2490 drivers/tty/n_tty.c:1742
tiocsti drivers/tty/tty_io.c:2186 [inline]
tty_ioctl+0xd5f/0x1220 drivers/tty/tty_io.c:2572
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0x75a/0xfe0 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45ca59
RSP: 002b:00007f18d87a3c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004ee9e0 RCX: 000000000045ca59
RDX: 0000000020000000 RSI: 0000000000005412 RDI: 0000000000000007
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000560 R14: 00000000004c818d R15: 00007f18d87a46d4
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'.
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'.
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'.
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'.
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'.
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'.
netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'.