oom_control is deprecated and will be removed. Please report your usecase to linux-mm@kvack.org if you depend on this functionality.
debugfs: out of free dentries, can not create directory 'mtd1'
ftl_cs: FTL header not found.
------------[ 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 kernel/rcu/srcutree.c:706, CPU#0: syz.0.0/5310
Modules linked in:
CPU: 0 UID: 0 PID: 5310 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:cleanup_srcu_struct+0x3d6/0x8b0 kernel/rcu/srcutree.c:706
Code: b5 8d 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: 0000:ffffc9000ee171b8 EFLAGS: 00010206
RAX: 1ffffd1ffff8a255 RBX: 0000607f739951c0 RCX: dffffc0000000000
RDX: 0000000000000001 RSI: ffffffff8e419d09 RDI: 00000000ffffffff
RBP: ffffe8ffffc511c0 R08: ffffffff907a877f R09: 1ffffffff20f50ef
R10: dffffc0000000000 R11: fffffbfff20f50f0 R12: ffff888012889000
R13: 0000000000000000 R14: ffffe8ffffc512a8 R15: 1ffffffff1cddbde
FS:  00007f6cbd5a26c0(0000) GS:ffff88808c2bc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f366fa3958c CR3: 000000000bf1c000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 blk_mq_free_tag_set+0x617/0x790 block/blk-mq.c:4976
 add_mtd_blktrans_dev+0xede/0x14b0 drivers/mtd/mtd_blkdevs.c:396
 mtdblock_add_mtd+0x18a/0x240 drivers/mtd/mtdblock.c:333
 blktrans_notify_add+0x9f/0xf0 drivers/mtd/mtd_blkdevs.c:464
 add_mtd_device+0x117f/0x17b0 drivers/mtd/mtdcore.c:828
 mtd_device_parse_register+0xc94/0xe10 drivers/mtd/mtdcore.c:1155
 add_device drivers/mtd/devices/block2mtd.c:327 [inline]
 block2mtd_setup2+0x834/0xda0 drivers/mtd/devices/block2mtd.c:459
 block2mtd_setup+0x27/0xe0 drivers/mtd/devices/block2mtd.c:476
 param_attr_store+0x214/0x310 kernel/params.c:591
 module_attr_store+0x65/0x90 kernel/params.c:906
 kernfs_fop_write_iter+0x3a4/0x540 fs/kernfs/file.c:345
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x612/0xba0 fs/read_write.c:687
 ksys_write+0x150/0x270 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6cbc79e159
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:00007f6cbd5a1fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f6cbca25fa0 RCX: 00007f6cbc79e159
RDX: 000000000000000a RSI: 00002000000000c0 RDI: 0000000000000003
RBP: 00007f6cbc83506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6cbca26038 R14: 00007f6cbca25fa0 R15: 00007ffca7122b48
 </TASK>