------------[ cut here ]------------
timer_delete_sync(&sdp->delay_work) && rcu_segcblist_n_cbs(&sdp->srcu_cblist)
WARNING: kernel/rcu/srcutree.c:707 at cleanup_srcu_struct+0x3d6/0x8b0, CPU#0: syz.5.1604/9911
Modules linked in:
CPU: 0 UID: 0 PID: 9911 Comm: syz.5.1604 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:cleanup_srcu_struct+0x3d6/0x8b0
Code: 1b 8c 00 48 83 7d 00 00 4c 8b 74 24 10 0f 85 dd 03 00 00 41 ff c5 41 83 e5 0f 41 83 fd 07 0f 86 e2 fe ff ff e9 ab 00 00 00 90 <0f> 0b 90 4c 8d b5 00 02 00 00 4c 89 f3 48 c1 eb 03 48 b8 00 00 00
RSP: 0018:ffffc9000f447b58 EFLAGS: 00010206
RAX: 1ffffd1fdc8ccc1d RBX: 0000607d56f90000 RCX: dffffc0000000000
RDX: 0000000000000001 RSI: ffffffff8e474924 RDI: 00000000ffffffff
RBP: ffffe8fee4666000 R08: ffffffff907a197f R09: 1ffffffff20f432f
R10: dffffc0000000000 R11: fffffbfff20f4330 R12: ffff888112f38800
R13: 0000000000000000 R14: ffffe8fee46660e8 R15: 1ffffffff1ce8dde
FS:  00007fd43ba326c0(0000) GS:ffff88818d6d6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc1a24606e0 CR3: 000000016eb18000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 blk_mq_free_tag_set+0x617/0x790
 loop_add+0x88d/0xb40
 loop_control_ioctl+0x12b/0x5a0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd43ab9e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd43ba32028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd43ae26180 RCX: 00007fd43ab9e159
RDX: 0000000007003f00 RSI: 0000000000004c80 RDI: 0000000000000007
RBP: 00007fd43ac35024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd43ae26218 R14: 00007fd43ae26180 R15: 00007ffc00b93858
 </TASK>
