======================================================
WARNING: possible circular locking dependency detected
6.1.0-rc7-syzkaller #0 Not tainted
------------------------------------------------------
kworker/3:3/3119 is trying to acquire lock:
ffff88802c93a9d8 (&pool->lock){-.-.}-{2:2}, at: __queue_work+0x367/0x13b0 kernel/workqueue.c:1474
but task is already holding lock:
ffff88801ea03528 (&tty->write_wait){-...}-{2:2}, at: __wake_up_common_lock+0xb4/0x130 kernel/sched/wait.c:136
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #4 (&tty->write_wait){-...}-{2:2}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3d/0x60 kernel/locking/spinlock.c:162
__wake_up_common_lock+0xb4/0x130 kernel/sched/wait.c:136
tty_port_default_wakeup+0x2a/0x40 drivers/tty/tty_port.c:71
serial8250_tx_chars+0x503/0xdb0 drivers/tty/serial/8250/8250_port.c:1859
__start_tx drivers/tty/serial/8250/8250_port.c:1575 [inline]
serial8250_start_tx+0x6d5/0x850 drivers/tty/serial/8250/8250_port.c:1681
__uart_start.isra.0+0x16b/0x1b0 drivers/tty/serial/serial_core.c:141
uart_write+0x2ff/0x570 drivers/tty/serial/serial_core.c:601
process_output_block drivers/tty/n_tty.c:586 [inline]
n_tty_write+0x4ce/0xfd0 drivers/tty/n_tty.c:2350
do_tty_write drivers/tty/tty_io.c:1018 [inline]
file_tty_write.constprop.0+0x452/0x890 drivers/tty/tty_io.c:1089
redirected_tty_write+0xa5/0xc0 drivers/tty/tty_io.c:1110
call_write_iter include/linux/fs.h:2199 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x9ed/0xdd0 fs/read_write.c:584
ksys_write+0x12b/0x250 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
-> #3 (&port_lock_key){-.-.}-{2:2}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3d/0x60 kernel/locking/spinlock.c:162
serial8250_console_write+0x4ba/0x1010 drivers/tty/serial/8250/8250_port.c:3395
call_console_driver kernel/printk/printk.c:1942 [inline]
console_emit_next_record.constprop.0+0x3de/0x840 kernel/printk/printk.c:2731
console_flush_all kernel/printk/printk.c:2793 [inline]
console_unlock+0x3c2/0x600 kernel/printk/printk.c:2860
vprintk_emit+0x1bd/0x600 kernel/printk/printk.c:2268
vprintk+0x84/0xa0 kernel/printk/printk_safe.c:50
_printk+0xbe/0xf1 kernel/printk/printk.c:2289
register_console kernel/printk/printk.c:3208 [inline]
register_console+0x45e/0x820 kernel/printk/printk.c:3103
univ8250_console_init+0x3e/0x4a drivers/tty/serial/8250/8250_core.c:687
console_init+0x3bb/0x582 kernel/printk/printk.c:3298
start_kernel+0x303/0x498 init/main.c:1073
secondary_startup_64_no_verify+0xce/0xdb
-> #2 (console_owner){....}-{0:0}:
console_lock_spinning_enable kernel/printk/printk.c:1805 [inline]
console_emit_next_record.constprop.0+0x2dd/0x840 kernel/printk/printk.c:2728
console_flush_all kernel/printk/printk.c:2793 [inline]
console_unlock+0x3c2/0x600 kernel/printk/printk.c:2860
vprintk_emit+0x1bd/0x600 kernel/printk/printk.c:2268
vprintk+0x84/0xa0 kernel/printk/printk_safe.c:50
_printk+0xbe/0xf1 kernel/printk/printk.c:2289
build_zonelists.cold+0xe5/0x11f mm/page_alloc.c:6506
__build_all_zonelists+0x122/0x180 mm/page_alloc.c:6619
build_all_zonelists_init+0x35/0x12f mm/page_alloc.c:6644
build_all_zonelists+0x123/0x140 mm/page_alloc.c:6677
start_kernel+0xbd/0x498 init/main.c:967
secondary_startup_64_no_verify+0xce/0xdb
-> #1 (zonelist_update_seq.seqcount){...-}-{0:0}:
seqcount_lockdep_reader_access include/linux/seqlock.h:102 [inline]
read_seqbegin include/linux/seqlock.h:836 [inline]
zonelist_iter_begin mm/page_alloc.c:4730 [inline]
__alloc_pages_slowpath.constprop.0+0x1ae/0x23d0 mm/page_alloc.c:5052
__alloc_pages+0x4aa/0x5b0 mm/page_alloc.c:5571
__alloc_pages_node include/linux/gfp.h:223 [inline]
kmem_getpages mm/slab.c:1363 [inline]
cache_grow_begin+0x75/0x360 mm/slab.c:2570
cache_alloc_refill+0x27f/0x380 mm/slab.c:2943
____cache_alloc mm/slab.c:3019 [inline]
____cache_alloc mm/slab.c:3002 [inline]
__do_cache_alloc mm/slab.c:3202 [inline]
slab_alloc_node mm/slab.c:3250 [inline]
slab_alloc mm/slab.c:3265 [inline]
__kmem_cache_alloc_lru mm/slab.c:3442 [inline]
kmem_cache_alloc+0x364/0x460 mm/slab.c:3461
kmem_cache_zalloc include/linux/slab.h:679 [inline]
fill_pool+0x264/0x5c0 lib/debugobjects.c:168
__debug_object_init+0x7a/0xd10 lib/debugobjects.c:562
debug_object_init lib/debugobjects.c:617 [inline]
debug_object_activate+0x330/0x3e0 lib/debugobjects.c:703
debug_work_activate kernel/workqueue.c:510 [inline]
__queue_work+0x682/0x13b0 kernel/workqueue.c:1516
queue_work_on+0xf2/0x110 kernel/workqueue.c:1545
queue_work include/linux/workqueue.h:503 [inline]
schedule_work include/linux/workqueue.h:564 [inline]
wireless_send_event+0x6de/0xc40 net/wireless/wext-core.c:635
__cfg80211_ibss_joined+0x41d/0x540 net/wireless/ibss.c:56
cfg80211_process_wdev_events+0x391/0x5e0 net/wireless/util.c:986
cfg80211_process_rdev_events+0x9f/0x130 net/wireless/util.c:1012
cfg80211_event_work+0x2b/0x40 net/wireless/core.c:328
process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289
worker_thread+0x669/0x1090 kernel/workqueue.c:2436
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
-> #0 (&pool->lock){-.-.}-{2:2}:
check_prev_add kernel/locking/lockdep.c:3097 [inline]
check_prevs_add kernel/locking/lockdep.c:3216 [inline]
validate_chain kernel/locking/lockdep.c:3831 [inline]
__lock_acquire+0x2a43/0x56d0 kernel/locking/lockdep.c:5055
lock_acquire kernel/locking/lockdep.c:5668 [inline]
lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
__queue_work+0x367/0x13b0 kernel/workqueue.c:1474
queue_work_on+0xf2/0x110 kernel/workqueue.c:1545
queue_work include/linux/workqueue.h:503 [inline]
schedule_work include/linux/workqueue.h:564 [inline]
p9_pollwake+0xc1/0x1d0 net/9p/trans_fd.c:540
__wake_up_common+0x147/0x650 kernel/sched/wait.c:107
__wake_up_common_lock+0xd0/0x130 kernel/sched/wait.c:137
tty_write_unlock drivers/tty/tty_io.c:939 [inline]
do_tty_write drivers/tty/tty_io.c:1043 [inline]
file_tty_write.constprop.0+0x504/0x890 drivers/tty/tty_io.c:1089
__kernel_write_iter+0x262/0x730 fs/read_write.c:517
__kernel_write fs/read_write.c:537 [inline]
kernel_write fs/read_write.c:558 [inline]
kernel_write+0x1c1/0x630 fs/read_write.c:548
p9_fd_write net/9p/trans_fd.c:434 [inline]
p9_write_work+0x25a/0xc60 net/9p/trans_fd.c:485
process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289
worker_thread+0x669/0x1090 kernel/workqueue.c:2436
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
other info that might help us debug this:
Chain exists of:
&pool->lock --> &port_lock_key --> &tty->write_wait
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&tty->write_wait);
lock(&port_lock_key);
lock(&tty->write_wait);
lock(&pool->lock);
*** DEADLOCK ***
5 locks held by kworker/3:3/3119:
#0: ffff888012061d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff888012061d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
#0: ffff888012061d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline]
#0: ffff888012061d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:636 [inline]
#0: ffff888012061d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline]
#0: ffff888012061d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x86d/0x1710 kernel/workqueue.c:2260
#1: ffffc90003987da8 ((work_completion)(&m->wq)){+.+.}-{0:0}, at: process_one_work+0x8a1/0x1710 kernel/workqueue.c:2264
#2: ffff88801ea03098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x26/0x80 drivers/tty/tty_ldisc.c:244
#3: ffff88801ea03528 (&tty->write_wait){-...}-{2:2}, at: __wake_up_common_lock+0xb4/0x130 kernel/sched/wait.c:136
#4: ffffffff8c58cdc0 (rcu_read_lock){....}-{1:2}, at: __queue_work+0xca/0x13b0 kernel/workqueue.c:1437
stack backtrace:
CPU: 3 PID: 3119 Comm: kworker/3:3 Not tainted 6.1.0-rc7-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Workqueue: events p9_write_work
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106
check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2177
check_prev_add kernel/locking/lockdep.c:3097 [inline]
check_prevs_add kernel/locking/lockdep.c:3216 [inline]
validate_chain kernel/locking/lockdep.c:3831 [inline]
__lock_acquire+0x2a43/0x56d0 kernel/locking/lockdep.c:5055
lock_acquire kernel/locking/lockdep.c:5668 [inline]
lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633
__raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
_raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
__queue_work+0x367/0x13b0 kernel/workqueue.c:1474
queue_work_on+0xf2/0x110 kernel/workqueue.c:1545
queue_work include/linux/workqueue.h:503 [inline]
schedule_work include/linux/workqueue.h:564 [inline]
p9_pollwake+0xc1/0x1d0 net/9p/trans_fd.c:540
__wake_up_common+0x147/0x650 kernel/sched/wait.c:107
__wake_up_common_lock+0xd0/0x130 kernel/sched/wait.c:137
tty_write_unlock drivers/tty/tty_io.c:939 [inline]
do_tty_write drivers/tty/tty_io.c:1043 [inline]
file_tty_write.constprop.0+0x504/0x890 drivers/tty/tty_io.c:1089
__kernel_write_iter+0x262/0x730 fs/read_write.c:517
__kernel_write fs/read_write.c:537 [inline]
kernel_write fs/read_write.c:558 [inline]
kernel_write+0x1c1/0x630 fs/read_write.c:548
p9_fd_write net/9p/trans_fd.c:434 [inline]
p9_write_work+0x25a/0xc60 net/9p/trans_fd.c:485
process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289
worker_thread+0x669/0x1090 kernel/workqueue.c:2436
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
</TASK>