================================
WARNING: inconsistent lock state
5.10.0-syzkaller #0 Not tainted
--------------------------------
inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.
ksoftirqd/1/16 [HC0[0]:SC1[1]:HE1:SE0] takes:
ffff88801ba102a8 (&file_data->lock){+.?.}-{2:2}, at: spin_lock include/linux/spinlock.h:354 [inline]
ffff88801ba102a8 (&file_data->lock){+.?.}-{2:2}, at: io_file_data_ref_zero+0x75/0x480 fs/io_uring.c:7361
{SOFTIRQ-ON-W} state was registered at:
lock_acquire kernel/locking/lockdep.c:5437 [inline]
lock_acquire+0x29d/0x740 kernel/locking/lockdep.c:5402
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151
spin_lock include/linux/spinlock.h:354 [inline]
io_sqe_files_register fs/io_uring.c:7496 [inline]
__io_uring_register fs/io_uring.c:9665 [inline]
__do_sys_io_uring_register+0x343a/0x40d0 fs/io_uring.c:9755
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
irq event stamp: 81729242
hardirqs last enabled at (81729242): [<ffffffff88e9a162>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
hardirqs last enabled at (81729242): [<ffffffff88e9a162>] _raw_spin_unlock_irqrestore+0x42/0x50 kernel/locking/spinlock.c:191
hardirqs last disabled at (81729241): [<ffffffff88e99f2e>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline]
hardirqs last disabled at (81729241): [<ffffffff88e99f2e>] _raw_spin_lock_irqsave+0x4e/0x50 kernel/locking/spinlock.c:159
softirqs last enabled at (81729034): [<ffffffff81426b7d>] run_ksoftirqd kernel/softirq.c:653 [inline]
softirqs last enabled at (81729034): [<ffffffff81426b7d>] run_ksoftirqd+0x2d/0x50 kernel/softirq.c:645
softirqs last disabled at (81729039): [<ffffffff81426b7d>] run_ksoftirqd kernel/softirq.c:653 [inline]
softirqs last disabled at (81729039): [<ffffffff81426b7d>] run_ksoftirqd+0x2d/0x50 kernel/softirq.c:645
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(&file_data->lock);
<Interrupt>
lock(&file_data->lock);
*** DEADLOCK ***
2 locks held by ksoftirqd/1/16:
#0: ffffffff8b3390c0 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2479 [inline]
#0: ffffffff8b3390c0 (rcu_callback){....}-{0:0}, at: rcu_core+0x582/0xf00 kernel/rcu/tree.c:2723
#1: ffffffff8b3391e0 (rcu_read_lock){....}-{1:2}, at: percpu_ref_put_many.constprop.0+0x0/0x250 net/netfilter/xt_cgroup.c:62
stack backtrace:
CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.10.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:79 [inline]
dump_stack+0x107/0x163 lib/dump_stack.c:120
print_usage_bug kernel/locking/lockdep.c:3740 [inline]
valid_state kernel/locking/lockdep.c:3751 [inline]
mark_lock_irq kernel/locking/lockdep.c:3954 [inline]
mark_lock.cold+0x31/0x73 kernel/locking/lockdep.c:4411
mark_usage kernel/locking/lockdep.c:4306 [inline]
__lock_acquire+0x11a5/0x5500 kernel/locking/lockdep.c:4786
lock_acquire kernel/locking/lockdep.c:5437 [inline]
lock_acquire+0x29d/0x740 kernel/locking/lockdep.c:5402
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151
spin_lock include/linux/spinlock.h:354 [inline]
io_file_data_ref_zero+0x75/0x480 fs/io_uring.c:7361
percpu_ref_put_many.constprop.0+0x217/0x250 include/linux/percpu-refcount.h:322
rcu_do_batch kernel/rcu/tree.c:2489 [inline]
rcu_core+0x5eb/0xf00 kernel/rcu/tree.c:2723
__do_softirq+0x2a0/0x9f6 kernel/softirq.c:298
run_ksoftirqd kernel/softirq.c:653 [inline]
run_ksoftirqd+0x2d/0x50 kernel/softirq.c:645
smpboot_thread_fn+0x655/0x9e0 kernel/smpboot.c:165
kthread+0x3b1/0x4a0 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296