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Subjectgeneral protection fault in _initial_num_blocks_is_ADDR

syzbot found the following crash on:

HEAD commit: 07c4b9e9 Merge tag 'scsi-fixes' of git://
git tree: upstream
console output:
kernel config:
dashboard link:
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:

kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 26867 Comm: kworker/u4:3 Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: pencrypt_parallel padata_parallel_worker
RIP: 0010:_initial_num_blocks_is_017529+0x2f7/0x3e1
Code: 00 00 c4 e2 71 dd c8 c4 e2 69 dd d0 c4 e2 61 dd d8 c4 e2 59 dd e0 c4
e2 51 dd e8 c4 e2 49 dd f0 c4 e2 41 dd f8 c4 62 39 dd c0 <c4> 21 7a 6f 24
19 c4 c1 71 ef cc c4 a1 7a 7f 0c 1a c4 21 7a 6f 64
RSP: 0018:ffffc90004ed7680 EFLAGS: 00010206
RAX: 0000000000000010 RBX: 0000000000000f80 RCX: 0005088000000080
RDX: ffff888066da800d RSI: ffffc90004ed78f0 RDI: ffff888062285850
RBP: ffffc90004ed7b20 R08: 0000000000000f80 R09: 000000000000000d
R10: 0000000000000080 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000f80 R14: ffffc90004ed7728 R15: 0000000000004000
FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d333000 CR3: 0000000094a09000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
gcmaes_encrypt arch/x86/crypto/aesni-intel_glue.c:840 [inline]
generic_gcmaes_encrypt+0x10d/0x160 arch/x86/crypto/aesni-intel_glue.c:1019
crypto_aead_encrypt+0xaf/0xf0 crypto/aead.c:94
simd_aead_encrypt+0x1a6/0x2b0 crypto/simd.c:335
crypto_aead_encrypt+0xaf/0xf0 crypto/aead.c:94
pcrypt_aead_enc+0x19/0x80 crypto/pcrypt.c:76
padata_parallel_worker+0x28f/0x470 kernel/padata.c:81
process_one_work+0x9af/0x1740 kernel/workqueue.c:2264
worker_thread+0x98/0xe40 kernel/workqueue.c:2410
kthread+0x361/0x430 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Modules linked in:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 26867 at kernel/locking/mutex.c:1419
mutex_trylock+0x279/0x2f0 kernel/locking/mutex.c:1427

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