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SubjectBUG: unable to handle kernel paging request in xfs_sb_quiet_read_verify
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Hello,

syzbot found the following crash on:

HEAD commit: 2187f215 Merge tag 'for-5.5-rc2-tag' of git://git.kernel.o..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11059951e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=ab2ae0615387ef78
dashboard link: https://syzkaller.appspot.com/bug?extid=4722bf4c6393b73a792b
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12727c71e00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12ff5151e00000

The bug was bisected to:

commit 0609ae011deb41c9629b7f5fd626dfa1ac9d16b0
Author: Daniel Axtens <dja@axtens.net>
Date: Sun Dec 1 01:55:00 2019 +0000

x86/kasan: support KASAN_VMALLOC

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=161240aee00000
final crash: https://syzkaller.appspot.com/x/report.txt?x=151240aee00000
console output: https://syzkaller.appspot.com/x/log.txt?x=111240aee00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+4722bf4c6393b73a792b@syzkaller.appspotmail.com
Fixes: 0609ae011deb ("x86/kasan: support KASAN_VMALLOC")

BUG: unable to handle page fault for address: fffff52000680000
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 21ffee067 P4D 21ffee067 PUD aa51c067 PMD a85e1067 PTE 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 3088 Comm: kworker/1:2 Not tainted 5.5.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: xfs-buf/loop0 xfs_buf_ioend_work
RIP: 0010:xfs_sb_quiet_read_verify+0x47/0xc0 fs/xfs/libxfs/xfs_sb.c:735
Code: 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 7f 49 8b 9c 24 30 01
00 00 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 <0f> b6 04 02 84
c0 74 04 3c 03 7e 50 8b 1b bf 58 46 53 42 89 de e8
RSP: 0018:ffffc90008187cc0 EFLAGS: 00010a06
RAX: dffffc0000000000 RBX: ffffc90003400000 RCX: ffffffff82ad3c26
RDX: 1ffff92000680000 RSI: ffffffff82aa0a0f RDI: ffff8880a2cdba70
RBP: ffffc90008187cd0 R08: ffff88809eb6c500 R09: ffffed1015d2703d
R10: ffffed1015d2703c R11: ffff8880ae9381e3 R12: ffff8880a2cdb940
R13: ffff8880a2cdb95c R14: ffff8880a2cdbb74 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffff52000680000 CR3: 000000009f5ab000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
xfs_buf_ioend+0x3f9/0xde0 fs/xfs/xfs_buf.c:1162
xfs_buf_ioend_work+0x19/0x20 fs/xfs/xfs_buf.c:1183
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:
CR2: fffff52000680000
---[ end trace 744ceb50d377bf94 ]---
RIP: 0010:xfs_sb_quiet_read_verify+0x47/0xc0 fs/xfs/libxfs/xfs_sb.c:735
Code: 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 7f 49 8b 9c 24 30 01
00 00 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 <0f> b6 04 02 84
c0 74 04 3c 03 7e 50 8b 1b bf 58 46 53 42 89 de e8
RSP: 0018:ffffc90008187cc0 EFLAGS: 00010a06
RAX: dffffc0000000000 RBX: ffffc90003400000 RCX: ffffffff82ad3c26
RDX: 1ffff92000680000 RSI: ffffffff82aa0a0f RDI: ffff8880a2cdba70
RBP: ffffc90008187cd0 R08: ffff88809eb6c500 R09: ffffed1015d2703d
R10: ffffed1015d2703c R11: ffff8880ae9381e3 R12: ffff8880a2cdb940
R13: ffff8880a2cdb95c R14: ffff8880a2cdbb74 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffff52000680000 CR3: 000000009f5ab000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches

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