------------[ cut here ]------------
WARNING: kernel/rcu/srcutree.c:706 at cleanup_srcu_struct+0x560/0xb94 kernel/rcu/srcutree.c:706, CPU#0: syz.1.2659/11201
Modules linked in:
CPU: 0 UID: 0 PID: 11201 Comm: syz.1.2659 Tainted: G             L      syzkaller #0 PREEMPT 
Tainted: [L]=SOFTLOCKUP
Hardware name: linux,dummy-virt (DT)
pstate: 00000005 (nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : cleanup_srcu_struct+0x560/0xb94 kernel/rcu/srcutree.c:706
lr : cleanup_srcu_struct+0x2bc/0xb94 kernel/rcu/srcutree.c:706
sp : ffff8000a1d079d0
x29: ffff8000a1d079d0 x28: 0000000000000000 x27: ffffffffffffffff
x26: ffff700010e6184b x25: fffffdffbf767440 x24: 1fffe000083c8866
x23: ffff80008730c258 x22: 0000000000000000 x21: ffff00002f7a2800
x20: ffff000041e442f0 x19: fffffdffbf741440 x18: 0000000000000000
x17: ffff7fffe484b000 x16: ffff00002dfa8d48 x15: ffff80008779a990
x14: 1ffff00010ef3532 x13: ffff800089e3cc20 x12: ffff60000d7f01a9
x11: 1fffe0000d7f01a8 x10: ffff60000d7f01a8 x9 : dfff800000000000
x8 : ffff8000a1d07750 x7 : ffff8000a1d078d0 x6 : ffff8000a1d07870
x5 : ffff8000a1d077b0 x4 : 1fffe00002e65001 x3 : fffffdffbf741528
x2 : 0000000000000000 x1 : 1fffffbff7ee82a5 x0 : 0000000000000003
Call trace:
 cleanup_srcu_struct+0x560/0xb94 kernel/rcu/srcutree.c:706 (P)
 blk_mq_free_tag_set+0x26c/0x41c block/blk-mq.c:4987
 loop_add+0x74c/0x96c drivers/block/loop.c:2130
 loop_control_ioctl+0xa8/0x4dc drivers/block/loop.c:2243
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __arm64_sys_ioctl+0x128/0x1a8 fs/ioctl.c:583
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x74/0x240 arch/arm64/kernel/syscall.c:49
 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x40/0x58 arch/arm64/kernel/syscall.c:140
 el0_svc+0x58/0x2ac arch/arm64/kernel/entry-common.c:758
 el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:777
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590
irq event stamp: 552
hardirqs last  enabled at (551): [<ffff8000859f662c>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:210 [inline]
hardirqs last  enabled at (551): [<ffff8000859f662c>] _raw_spin_unlock_irqrestore+0x80/0xb4 kernel/locking/spinlock.c:221
hardirqs last disabled at (552): [<ffff8000859c93f0>] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:445
softirqs last  enabled at (346): [<ffff80008023bce4>] softirq_handle_end kernel/softirq.c:491 [inline]
softirqs last  enabled at (346): [<ffff80008023bce4>] handle_softirqs+0xa98/0x1054 kernel/softirq.c:673
softirqs last disabled at (335): [<ffff8000800103d4>] __do_softirq+0x14/0x20 kernel/softirq.c:679
---[ end trace 0000000000000000 ]---