[syzbot] general protection fault in _wait_barrier

[syzbot <syzbot+3fe892ea5fc292e1353f@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    818bebeb63dd drm/xe: Don't hand out the flat CCS storage a..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=1255d415580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ccca94d2c01b9e78
dashboard link: https://syzkaller.appspot.com/bug?extid=3fe892ea5fc292e1353f
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13d96979580000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3fe892ea5fc292e1353f@syzkaller.appspotmail.com

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000024: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000120-0x0000000000000127]
CPU: 1 UID: 0 PID: 6010 Comm: syz-executor394 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:_wait_barrier+0x8d/0x700 drivers/md/raid1.c:1066
Code: 08 00 00 00 f3 c7 40 0c f3 f3 f3 f3 65 48 8b 05 31 1e 0e 0c 48 89 84 24 d0 00 00 00 31 c0 e8 ea 3f 91 f9 48 89 e8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 11 06 00 00 4c 8b a3 20 01 00 00 4a 8d 04 ad
RSP: 0018:ffffc90003487290 EFLAGS: 00010206
RAX: 0000000000000024 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888031924b00 RSI: ffffffff8879c1e6 RDI: 0000000000000000
RBP: 0000000000000120 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff81d66229 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff88802750c000 R15: ffffc900034879d0
FS:  00007fe51d1166c0(0000) GS:ffff8880d5ca2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005599d4a2eb80 CR3: 0000000035c6b000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 wait_barrier drivers/md/raid1.c:1154 [inline]
 raid1_write_request drivers/md/raid1.c:1506 [inline]
 raid1_make_request+0x484/0x31a0 drivers/md/raid1.c:1696
 md_handle_request+0x824/0x1230 drivers/md/md.c:417
 md_submit_bio+0x1e9/0x350 drivers/md/md.c:458
 __submit_bio block/blk-core.c:681 [inline]
 __submit_bio+0x20e/0x3d0 block/blk-core.c:670
 __submit_bio_noacct block/blk-core.c:724 [inline]
 submit_bio_noacct_nocheck+0x736/0xc00 block/blk-core.c:792
 submit_bio_noacct+0xc93/0x2130 block/blk-core.c:925
 bio_await+0x1fa/0x240 block/bio.c:1580
 submit_bio_wait+0x19/0x60 block/bio.c:1598
 __blkdev_direct_IO_simple+0x4cb/0x8c0 block/fops.c:98
 blkdev_direct_IO+0xbee/0x2030 block/fops.c:429
 blkdev_direct_write block/fops.c:699 [inline]
 blkdev_write_iter+0x703/0xd30 block/fops.c:767
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6af/0x1050 fs/read_write.c:687
 ksys_pwrite64 fs/read_write.c:794 [inline]
 __do_sys_pwrite64 fs/read_write.c:802 [inline]
 __se_sys_pwrite64 fs/read_write.c:799 [inline]
 __x64_sys_pwrite64+0x1eb/0x250 fs/read_write.c:799
 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: 0033:0x7fe51d1735de
Code: 08 0f 85 f5 e2 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 90 41 57 41 56 4d 89 c6 41 55 4d 89 cd 41 54 55 53 48 83 ec 08
RSP: 002b:00007fe51d116128 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007fe51d1166c0 RCX: 00007fe51d1735de
RDX: 0000000000001000 RSI: 0000555588ed6000 RDI: 0000000000000005
RBP: 0000000000000021 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffd0
R13: 0000000000000002 R14: 00007ffdb60faaa0 R15: 00007ffdb60fab88
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:_wait_barrier+0x8d/0x700 drivers/md/raid1.c:1066
Code: 08 00 00 00 f3 c7 40 0c f3 f3 f3 f3 65 48 8b 05 31 1e 0e 0c 48 89 84 24 d0 00 00 00 31 c0 e8 ea 3f 91 f9 48 89 e8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 11 06 00 00 4c 8b a3 20 01 00 00 4a 8d 04 ad
RSP: 0018:ffffc90003487290 EFLAGS: 00010206

RAX: 0000000000000024 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888031924b00 RSI: ffffffff8879c1e6 RDI: 0000000000000000
RBP: 0000000000000120 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff81d66229 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff88802750c000 R15: ffffc900034879d0
FS:  00007fe51d1166c0(0000) GS:ffff8880d5ca2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005599d4a2eb80 CR3: 0000000035c6b000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
   0:	08 00                	or     %al,(%rax)
   2:	00 00                	add    %al,(%rax)
   4:	f3 c7 40 0c f3 f3 f3 	xrelease movl $0xf3f3f3f3,0xc(%rax)
   b:	f3
   c:	65 48 8b 05 31 1e 0e 	mov    %gs:0xc0e1e31(%rip),%rax        # 0xc0e1e45
  13:	0c
  14:	48 89 84 24 d0 00 00 	mov    %rax,0xd0(%rsp)
  1b:	00
  1c:	31 c0                	xor    %eax,%eax
  1e:	e8 ea 3f 91 f9       	call   0xf991400d
  23:	48 89 e8             	mov    %rbp,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1) <-- trapping instruction
  2f:	0f 85 11 06 00 00    	jne    0x646
  35:	4c 8b a3 20 01 00 00 	mov    0x120(%rbx),%r12
  3c:	4a                   	rex.WX
  3d:	8d                   	.byte 0x8d
  3e:	04 ad                	add    $0xad,%al


---
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