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Subject[syzbot] general protection fault in gfs2_evict_inode
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Hello,

syzbot found the following issue on:

HEAD commit: d4439a1189f9 Merge tag 'hsi-for-5.16' of git://git.kernel...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13fae7cab00000
kernel config: https://syzkaller.appspot.com/x/.config?x=7f2760850058fbfb
dashboard link: https://syzkaller.appspot.com/bug?extid=f77e2d1dc867b6accaf9
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

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

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f77e2d1dc867b6accaf9@syzkaller.appspotmail.com

R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000
R13: 0000000020000100 R14: 00007f4836721000 R15: 0000000020047a20
</TASK>
gfs2: fsid=syz:syz.0: can't read journal index: -5
general protection fault, probably for non-canonical address 0xdffffc0000000011: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000088-0x000000000000008f]
CPU: 1 PID: 25372 Comm: syz-executor.3 Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:evict_linked_inode fs/gfs2/super.c:1331 [inline]
RIP: 0010:gfs2_evict_inode+0xbe2/0x2070 fs/gfs2/super.c:1386
Code: 03 80 3c 02 00 0f 85 d0 13 00 00 48 8b 9d 00 09 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bb 8c 00 00 00 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 09 84 d2 74 05 e8
RSP: 0018:ffffc90009bb77c8 EFLAGS: 00010217
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc9000b53c000
RDX: 0000000000000011 RSI: ffffffff836c5f71 RDI: 000000000000008c
RBP: ffff88803ae28000 R08: 0000000000000000 R09: ffff88807115fb43
R10: ffffffff83666100 R11: 0000000000000000 R12: 0000000000000001
R13: ffff88807115fcb8 R14: ffff8880959e5cd8 R15: ffff8880959e5828
FS: 00007f4836721700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2fb011f000 CR3: 0000000022ee7000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
<TASK>
evict+0x2ed/0x6b0 fs/inode.c:588
iput_final fs/inode.c:1664 [inline]
iput.part.0+0x539/0x850 fs/inode.c:1690
iput+0x58/0x70 fs/inode.c:1680
dentry_unlink_inode+0x2b1/0x460 fs/dcache.c:376
__dentry_kill+0x3c0/0x640 fs/dcache.c:582
dentry_kill fs/dcache.c:708 [inline]
dput+0x738/0xbc0 fs/dcache.c:888
gfs2_fill_super+0x2048/0x28a0 fs/gfs2/ops_fstype.c:1296
get_tree_bdev+0x440/0x760 fs/super.c:1293
gfs2_get_tree+0x4a/0x270 fs/gfs2/ops_fstype.c:1327
vfs_get_tree+0x89/0x2f0 fs/super.c:1498
do_new_mount fs/namespace.c:2988 [inline]
path_mount+0x1320/0x1fa0 fs/namespace.c:3318
do_mount fs/namespace.c:3331 [inline]
__do_sys_mount fs/namespace.c:3539 [inline]
__se_sys_mount fs/namespace.c:3516 [inline]
__x64_sys_mount+0x27f/0x300 fs/namespace.c:3516
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f48391ad01a
Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4836720fa8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007f48391ad01a
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f4836721000
RBP: 00007f4836721040 R08: 00007f4836721040 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000
R13: 0000000020000100 R14: 00007f4836721000 R15: 0000000020047a20
</TASK>
Modules linked in:
---[ end trace 68c9d12f167f0520 ]---
RIP: 0010:evict_linked_inode fs/gfs2/super.c:1331 [inline]
RIP: 0010:gfs2_evict_inode+0xbe2/0x2070 fs/gfs2/super.c:1386
Code: 03 80 3c 02 00 0f 85 d0 13 00 00 48 8b 9d 00 09 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bb 8c 00 00 00 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 09 84 d2 74 05 e8
RSP: 0018:ffffc90009bb77c8 EFLAGS: 00010217
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc9000b53c000
RDX: 0000000000000011 RSI: ffffffff836c5f71 RDI: 000000000000008c
RBP: ffff88803ae28000 R08: 0000000000000000 R09: ffff88807115fb43
R10: ffffffff83666100 R11: 0000000000000000 R12: 0000000000000001
R13: ffff88807115fcb8 R14: ffff8880959e5cd8 R15: ffff8880959e5828
FS: 00007f4836721700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2fb011f000 CR3: 0000000022ee7000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
----------------
Code disassembly (best guess):
0: 03 80 3c 02 00 0f add 0xf00023c(%rax),%eax
6: 85 d0 test %edx,%eax
8: 13 00 adc (%rax),%eax
a: 00 48 8b add %cl,-0x75(%rax)
d: 9d popfq
e: 00 09 add %cl,(%rcx)
10: 00 00 add %al,(%rax)
12: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
19: fc ff df
1c: 48 8d bb 8c 00 00 00 lea 0x8c(%rbx),%rdi
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx <-- trapping instruction
2e: 48 89 f8 mov %rdi,%rax
31: 83 e0 07 and $0x7,%eax
34: 83 c0 03 add $0x3,%eax
37: 38 d0 cmp %dl,%al
39: 7c 09 jl 0x44
3b: 84 d2 test %dl,%dl
3d: 74 05 je 0x44
3f: e8 .byte 0xe8


---
This report 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 issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

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