nvme nvme0: creating 2 I/O queues.
blk-mq: failed to allocate request map
------------[ cut here ]------------
timer_delete_sync(&sdp->delay_work) && rcu_segcblist_n_cbs(&sdp->srcu_cblist)
WARNING: kernel/rcu/srcutree.c:706 at cleanup_srcu_struct+0x6e4/0xb30 kernel/rcu/srcutree.c:706, CPU#0: syz.3.8/5873
Modules linked in:
CPU: 0 UID: 0 PID: 5873 Comm: syz.3.8 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: 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 f4 03 00 00 48 8b 83 e8 00 00 00 48 8d 93 80 01 00 00 48 85 c0 0f 84 a7 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:ffffc90004c6f9c8 EFLAGS: 00010202
RAX: 0000000000000001 RBX: ffffe8ffffcaa5c0 RCX: ffffc90005a39000
RDX: ffffe8ffffcaa740 RSI: ffffffff81f6e53f RDI: ffff888033ad8000
RBP: ffff88807fbe9800 R08: 0000000000000005 R09: 00000000ffffffff
R10: 0000000000000001 R11: 0000000000000000 R12: ffff88802c898310
R13: 0000000000000000 R14: ffffffff8e6600b0 R15: ffff88802c898350
FS:  00007fba1fd3f6c0(0000) GS:ffff888123b4c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055e9476d3df0 CR3: 000000002c20d000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 blk_mq_alloc_tag_set+0xdd8/0x1330 block/blk-mq.c:4939
 nvme_alloc_io_tag_set+0x3bc/0x750 drivers/nvme/host/core.c:5076
 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: 0033:0x7fba1ed9e159
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:00007fba1fd3f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fba1f025fa0 RCX: 00007fba1ed9e159
RDX: 000000000000001e RSI: 0000200000000900 RDI: 0000000000000004
RBP: 00007fba1ee3506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fba1f026038 R14: 00007fba1f025fa0 R15: 00007ffca1cd2228
 </TASK>