nvme nvme0: creating 2 I/O queues.
blk-mq: failed to allocate request map
------------[ cut here ]------------
timer_delete_sync(&sdp->delay_work) && !rcu_segcblist_empty(&sdp->srcu_cblist)
WARNING: kernel/rcu/srcutree.c:706 at cleanup_srcu_struct+0x6e4/0xb30 kernel/rcu/srcutree.c:706, CPU#0: syz.1.4028/19941
Modules linked in:
CPU: 0 UID: 0 PID: 19941 Comm: syz.1.4028 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026
RIP: 0010:cleanup_srcu_struct+0x6e4/0xb30 kernel/rcu/srcutree.c:706
Code: df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 df 03 00 00 48 8b 83 80 00 00 00 48 8d 93 80 01 00 00 48 85 c0 0f 84 9b fc ff ff 90 <0f> 0b 90 48 8d 8b 00 02 00 00 48 b8 00 00 00 00 00 fc ff df 48 89
RSP: 0018:ffffc9000e96f9c8 EFLAGS: 00010286
RAX: ffff8880588890f0 RBX: ffffe8ffffc590c0 RCX: ffffc900058f9000
RDX: ffffe8ffffc59240 RSI: ffffffff81f711af RDI: ffffe8ffffc59140
RBP: ffff8880798c3800 R08: 0000000000000005 R09: 00000000ffffffff
R10: 0000000000000001 R11: 0000000000000000 R12: ffff88807e574310
R13: 0000000000000000 R14: ffffffff8e6b60b0 R15: ffff88807e574350
FS:  00007f5c24f8b6c0(0000) GS:ffff888122930000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4700add525 CR3: 0000000059fa1000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 blk_mq_alloc_tag_set+0xdd3/0x1330 block/blk-mq.c:4939
 nvme_alloc_io_tag_set+0x3bc/0x750 drivers/nvme/host/core.c:5086
 nvme_loop_create_io_queues drivers/nvme/target/loop.c:515 [inline]
 nvme_loop_create_ctrl+0x6bc/0xee0 drivers/nvme/target/loop.c:610
 nvmf_create_ctrl drivers/nvme/host/fabrics.c:1361 [inline]
 nvmf_dev_write+0x4ee/0xb60 drivers/nvme/host/fabrics.c:1408
 vfs_write+0x2aa/0x1050 fs/read_write.c:685
 ksys_write+0x12a/0x250 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5c2419f559
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:00007f5c24f8b028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f5c24425fa0 RCX: 00007f5c2419f559
RDX: 000000000000001d RSI: 00002000000007c0 RDI: 0000000000000007
RBP: 00007f5c24236b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5c24426038 R14: 00007f5c24425fa0 R15: 00007fff083d7468
 </TASK>