[moderation/CI] Re: fs/super: fix s_fs_info leak when setup_bdev_super() fails

[syzbot ci]

syzbot ci has tested the following series

[v1] fs/super: fix s_fs_info leak when setup_bdev_super() fails
https://lore.kernel.org/all/20260201073226.34...@mpiricsoftware.com
* [PATCH] fs/super: fix s_fs_info leak when setup_bdev_super() fails

and found the following issues:
* general protection fault in erofs_kill_sb
* general protection fault in fuse_kill_sb_blk
* general protection fault in ntfs3_kill_sb
* general protection fault in xfs_mount_free

Full report is available here:
https://ci.syzbot.org/series/34ca307f-9eb2-40cb-881d-22abe7ea1c0b

***

general protection fault in erofs_kill_sb

tree: linux-next
URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next
base: 602544773763da411ffa67567fa1d146f3a40231
arch: amd64
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
config: https://ci.syzbot.org/builds/ff62b70a-8cc2-476e-8c76-3012c5b4ad76/config
C repro: https://ci.syzbot.org/findings/a774c7af-2849-4e3d-ae0d-489b13e32852/c_repro
syz repro: https://ci.syzbot.org/findings/a774c7af-2849-4e3d-ae0d-489b13e32852/syz_repro

EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback.
ext4 filesystem being mounted at /0/bus supports timestamps until 2038-01-19 (0x7fffffff)
/dev/loop0: Can't open blockdev
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
CPU: 1 UID: 0 PID: 5991 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:erofs_kill_sb+0x4c/0x190 fs/erofs/super.c:906
Code: 9f 38 06 00 00 48 89 dd 48 c1 ed 03 42 80 7c 2d 00 00 74 08 48 89 df e8 82 83 eb fd 4c 8b 33 4d 8d 66 10 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 65 83 eb fd 49 83 3c 24 00 74 0f
RSP: 0018:ffffc900039e7b58 EFLAGS: 00010202
RAX: 0000000000000002 RBX: ffff88816ed88638 RCX: ffff88816c548000
RDX: 0000000000000000 RSI: ffffffff8dad1d20 RDI: ffff88816ed88000
RBP: 1ffff1102ddb10c7 R08: ffffffff8fcec177 R09: 1ffffffff1f9d82e
R10: dffffc0000000000 R11: ffffffff843ef960 R12: 0000000000000010
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88816ed88000
FS: 000055558ffb4500(0000) GS:ffff8882a9942000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30763fff CR3: 00000001127bc000 CR4: 00000000000006f0
Call Trace:
<TASK>
deactivate_locked_super+0xbc/0x130 fs/super.c:474
get_tree_bdev_flags+0x4b4/0x560 fs/super.c:1698
vfs_get_tree+0x92/0x2a0 fs/super.c:1756
fc_mount fs/namespace.c:1199 [inline]
do_new_mount_fc fs/namespace.c:3636 [inline]
do_new_mount+0x329/0xa50 fs/namespace.c:3712
do_mount fs/namespace.c:4035 [inline]
__do_sys_mount fs/namespace.c:4224 [inline]
__se_sys_mount+0x31d/0x420 fs/namespace.c:4201
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf0/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3a7139acb9
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:00007fff10bbdc58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f3a71615fa0 RCX: 00007f3a7139acb9
RDX: 0000200000000700 RSI: 00002000000006c0 RDI: 0000200000000640
RBP: 00007f3a71408bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3a71615fac R14: 00007f3a71615fa0 R15: 00007f3a71615fa0
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:erofs_kill_sb+0x4c/0x190 fs/erofs/super.c:906
Code: 9f 38 06 00 00 48 89 dd 48 c1 ed 03 42 80 7c 2d 00 00 74 08 48 89 df e8 82 83 eb fd 4c 8b 33 4d 8d 66 10 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 65 83 eb fd 49 83 3c 24 00 74 0f
RSP: 0018:ffffc900039e7b58 EFLAGS: 00010202
RAX: 0000000000000002 RBX: ffff88816ed88638 RCX: ffff88816c548000
RDX: 0000000000000000 RSI: ffffffff8dad1d20 RDI: ffff88816ed88000
RBP: 1ffff1102ddb10c7 R08: ffffffff8fcec177 R09: 1ffffffff1f9d82e
R10: dffffc0000000000 R11: ffffffff843ef960 R12: 0000000000000010
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88816ed88000
FS: 000055558ffb4500(0000) GS:ffff8882a9942000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30763fff CR3: 00000001127bc000 CR4: 00000000000006f0
----------------
Code disassembly (best guess):
0: 9f lahf
1: 38 06 cmp %al,(%rsi)
3: 00 00 add %al,(%rax)
5: 48 89 dd mov %rbx,%rbp
8: 48 c1 ed 03 shr $0x3,%rbp
c: 42 80 7c 2d 00 00 cmpb $0x0,0x0(%rbp,%r13,1)
12: 74 08 je 0x1c
14: 48 89 df mov %rbx,%rdi
17: e8 82 83 eb fd call 0xfdeb839e
1c: 4c 8b 33 mov (%rbx),%r14
1f: 4d 8d 66 10 lea 0x10(%r14),%r12
23: 4c 89 e0 mov %r12,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 4c 89 e7 mov %r12,%rdi
34: e8 65 83 eb fd call 0xfdeb839e
39: 49 83 3c 24 00 cmpq $0x0,(%r12)
3e: 74 0f je 0x4f


***

general protection fault in fuse_kill_sb_blk

tree: linux-next
URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next
base: 602544773763da411ffa67567fa1d146f3a40231
arch: amd64
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
config: https://ci.syzbot.org/builds/ff62b70a-8cc2-476e-8c76-3012c5b4ad76/config
C repro: https://ci.syzbot.org/findings/23ab56a2-425c-4ce8-ba8d-1743bb4b889d/c_repro
syz repro: https://ci.syzbot.org/findings/23ab56a2-425c-4ce8-ba8d-1743bb4b889d/syz_repro

EXT4-fs (loop0): 1 orphan inode deleted
EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 ro without journal. Quota mode: writeback.
/dev/loop0: Can't open blockdev
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 UID: 0 PID: 5983 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:fuse_mount_destroy fs/fuse/inode.c:2118 [inline]
RIP: 0010:fuse_kill_sb_blk+0x210/0x270 fs/fuse/inode.c:2145
Code: fe 4c 89 ff e8 d1 b5 ff ff 48 89 ef e8 79 5d 00 ff 43 80 3c 2e 00 74 08 48 89 df e8 0a da ed fe 48 8b 1b 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 f1 d9 ed fe 48 8b 3b e8 f9 6a ff
RSP: 0018:ffffc90003c17af8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888118069d40
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 00000000ffffffff
RBP: ffff8881168e0000 R08: ffff8881168e0077 R09: 1ffff11022d1c00e
R10: dffffc0000000000 R11: ffffed1022d1c00f R12: ffff8881168e0068
R13: dffffc0000000000 R14: 1ffff11022d1c0c7 R15: 0000000000000000
FS: 0000555591c2f500(0000) GS:ffff88818e342000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002000 CR3: 00000001115be000 CR4: 00000000000006f0
Call Trace:
<TASK>
deactivate_locked_super+0xbc/0x130 fs/super.c:474
get_tree_bdev_flags+0x4b4/0x560 fs/super.c:1698
fuse_get_tree+0x23c/0x4f0 fs/fuse/inode.c:2003
vfs_get_tree+0x92/0x2a0 fs/super.c:1756
fc_mount fs/namespace.c:1199 [inline]
do_new_mount_fc fs/namespace.c:3636 [inline]
do_new_mount+0x329/0xa50 fs/namespace.c:3712
do_mount fs/namespace.c:4035 [inline]
__do_sys_mount fs/namespace.c:4224 [inline]
__se_sys_mount+0x31d/0x420 fs/namespace.c:4201
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf0/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f29dd79acb9
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:00007fffc5c2bf88 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f29dda15fa0 RCX: 00007f29dd79acb9
RDX: 0000200000000080 RSI: 0000200000000040 RDI: 0000200000000000
RBP: 00007f29dd808bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000003000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f29dda15fac R14: 00007f29dda15fa0 R15: 00007f29dda15fa0
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:fuse_mount_destroy fs/fuse/inode.c:2118 [inline]
RIP: 0010:fuse_kill_sb_blk+0x210/0x270 fs/fuse/inode.c:2145
Code: fe 4c 89 ff e8 d1 b5 ff ff 48 89 ef e8 79 5d 00 ff 43 80 3c 2e 00 74 08 48 89 df e8 0a da ed fe 48 8b 1b 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 f1 d9 ed fe 48 8b 3b e8 f9 6a ff
RSP: 0018:ffffc90003c17af8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888118069d40
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 00000000ffffffff
RBP: ffff8881168e0000 R08: ffff8881168e0077 R09: 1ffff11022d1c00e
R10: dffffc0000000000 R11: ffffed1022d1c00f R12: ffff8881168e0068
R13: dffffc0000000000 R14: 1ffff11022d1c0c7 R15: 0000000000000000
FS: 0000555591c2f500(0000) GS:ffff88818e342000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002000 CR3: 00000001115be000 CR4: 00000000000006f0
----------------
Code disassembly (best guess):
0: fe 4c 89 ff decb -0x1(%rcx,%rcx,4)
4: e8 d1 b5 ff ff call 0xffffb5da
9: 48 89 ef mov %rbp,%rdi
c: e8 79 5d 00 ff call 0xff005d8a
11: 43 80 3c 2e 00 cmpb $0x0,(%r14,%r13,1)
16: 74 08 je 0x20
18: 48 89 df mov %rbx,%rdi
1b: e8 0a da ed fe call 0xfeedda2a
20: 48 8b 1b mov (%rbx),%rbx
23: 48 89 d8 mov %rbx,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 48 89 df mov %rbx,%rdi
34: e8 f1 d9 ed fe call 0xfeedda2a
39: 48 8b 3b mov (%rbx),%rdi
3c: e8 .byte 0xe8
3d: f9 stc
3e: 6a ff push $0xffffffffffffffff


***

general protection fault in ntfs3_kill_sb

tree: linux-next
URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next
base: 602544773763da411ffa67567fa1d146f3a40231
arch: amd64
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
config: https://ci.syzbot.org/builds/ff62b70a-8cc2-476e-8c76-3012c5b4ad76/config
C repro: https://ci.syzbot.org/findings/701e05cd-daef-4ecc-9716-2188883c4d68/c_repro
syz repro: https://ci.syzbot.org/findings/701e05cd-daef-4ecc-9716-2188883c4d68/syz_repro

F2FS-fs (loop0): f2fs_recover_fsync_data: recovery fsync data, check_only: 0
F2FS-fs (loop0): Try to recover 1th superblock, ret: 0
F2FS-fs (loop0): Mounted with checkpoint version = 48b305e5
/dev/loop0: Can't open blockdev
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000137: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x00000000000009b8-0x00000000000009bf]
CPU: 1 UID: 0 PID: 5980 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:ntfs3_kill_sb+0x52/0x1c0 fs/ntfs3/super.c:1864
Code: 03 42 80 3c 38 00 74 05 e8 6b 1f 0f ff 49 8b 9e 38 06 00 00 4c 89 f7 e8 bc a2 21 ff 4c 8d b3 b8 09 00 00 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 3f 1f 0f ff 4d 8b 36 4d 85 f6 74
RSP: 0018:ffffc90004087b70 EFLAGS: 00010202
RAX: 0000000000000137 RBX: 0000000000000000 RCX: ffff88810a281d40
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 00000000ffffffff
RBP: ffffc90004087c00 R08: ffff88811696a077 R09: 1ffff11022d2d40e
R10: dffffc0000000000 R11: ffffed1022d2d40f R12: dffffc0000000000
R13: ffff88811696a638 R14: 00000000000009b8 R15: dffffc0000000000
FS: 00005555632f0500(0000) GS:ffff8882a9942000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f12cce706c0 CR3: 0000000173c4e000 CR4: 00000000000006f0
Call Trace:
<TASK>
deactivate_locked_super+0xbc/0x130 fs/super.c:474
get_tree_bdev_flags+0x4b4/0x560 fs/super.c:1698
vfs_get_tree+0x92/0x2a0 fs/super.c:1756
fc_mount fs/namespace.c:1199 [inline]
do_new_mount_fc fs/namespace.c:3636 [inline]
do_new_mount+0x329/0xa50 fs/namespace.c:3712
do_mount fs/namespace.c:4035 [inline]
__do_sys_mount fs/namespace.c:4224 [inline]
__se_sys_mount+0x31d/0x420 fs/namespace.c:4201
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf0/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f12ccf9acb9
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:00007ffeb8b65048 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f12cd215fa0 RCX: 00007f12ccf9acb9
RDX: 00002000000000c0 RSI: 0000200000000180 RDI: 0000200000000100
RBP: 00007f12cd008bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f12cd215fac R14: 00007f12cd215fa0 R15: 00007f12cd215fa0
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ntfs3_kill_sb+0x52/0x1c0 fs/ntfs3/super.c:1864
Code: 03 42 80 3c 38 00 74 05 e8 6b 1f 0f ff 49 8b 9e 38 06 00 00 4c 89 f7 e8 bc a2 21 ff 4c 8d b3 b8 09 00 00 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 3f 1f 0f ff 4d 8b 36 4d 85 f6 74
RSP: 0018:ffffc90004087b70 EFLAGS: 00010202
RAX: 0000000000000137 RBX: 0000000000000000 RCX: ffff88810a281d40
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 00000000ffffffff
RBP: ffffc90004087c00 R08: ffff88811696a077 R09: 1ffff11022d2d40e
R10: dffffc0000000000 R11: ffffed1022d2d40f R12: dffffc0000000000
R13: ffff88811696a638 R14: 00000000000009b8 R15: dffffc0000000000
FS: 00005555632f0500(0000) GS:ffff8882a9942000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f12cce706c0 CR3: 0000000173c4e000 CR4: 00000000000006f0
----------------
Code disassembly (best guess):
0: 03 42 80 add -0x80(%rdx),%eax
3: 3c 38 cmp $0x38,%al
5: 00 74 05 e8 add %dh,-0x18(%rbp,%rax,1)
9: 6b 1f 0f imul $0xf,(%rdi),%ebx
c: ff 49 8b decl -0x75(%rcx)
f: 9e sahf
10: 38 06 cmp %al,(%rsi)
12: 00 00 add %al,(%rax)
14: 4c 89 f7 mov %r14,%rdi
17: e8 bc a2 21 ff call 0xff21a2d8
1c: 4c 8d b3 b8 09 00 00 lea 0x9b8(%rbx),%r14
23: 4c 89 f0 mov %r14,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 4c 89 f7 mov %r14,%rdi
34: e8 3f 1f 0f ff call 0xff0f1f78
39: 4d 8b 36 mov (%r14),%r14
3c: 4d 85 f6 test %r14,%r14
3f: 74 .byte 0x74


***

general protection fault in xfs_mount_free

tree: linux-next
URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next
base: 602544773763da411ffa67567fa1d146f3a40231
arch: amd64
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
config: https://ci.syzbot.org/builds/ff62b70a-8cc2-476e-8c76-3012c5b4ad76/config
C repro: https://ci.syzbot.org/findings/5b7b1e1a-4d82-45fc-a796-e0633aa2c690/c_repro
syz repro: https://ci.syzbot.org/findings/5b7b1e1a-4d82-45fc-a796-e0633aa2c690/syz_repro

=======================================================
JBD2: Ignoring recovery information on journal
ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode.
/dev/loop0: Can't open blockdev
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000034: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x00000000000001a0-0x00000000000001a7]
CPU: 1 UID: 0 PID: 5983 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:xfs_mount_free+0x27/0x1a0 fs/xfs/xfs_super.c:815
Code: 90 90 90 41 57 41 56 41 54 53 48 89 fb 49 bc 00 00 00 00 00 fc ff df e8 d7 f1 41 fe 4c 8d b3 a0 01 00 00 4c 89 f0 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 f7 e8 9a 24 a9 fe 4d 8b 36 4d 85 f6 74
RSP: 0018:ffffc90004077b68 EFLAGS: 00010202
RAX: 0000000000000034 RBX: 0000000000000000 RCX: ffff88816aad1d40
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000
RBP: ffffc90004077c00 R08: ffff8881b715c077 R09: 1ffff11036e2b80e
R10: dffffc0000000000 R11: ffffed1036e2b80f R12: dffffc0000000000
R13: ffff8881b715c638 R14: 00000000000001a0 R15: ffff8881b715c768
FS: 00005555782c2500(0000) GS:ffff8882a9942000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001200 CR3: 0000000174202000 CR4: 00000000000006f0
Call Trace:
<TASK>
deactivate_locked_super+0xbc/0x130 fs/super.c:474
get_tree_bdev_flags+0x4b4/0x560 fs/super.c:1698
vfs_get_tree+0x92/0x2a0 fs/super.c:1756
fc_mount fs/namespace.c:1199 [inline]
do_new_mount_fc fs/namespace.c:3636 [inline]
do_new_mount+0x329/0xa50 fs/namespace.c:3712
do_mount fs/namespace.c:4035 [inline]
__do_sys_mount fs/namespace.c:4224 [inline]
__se_sys_mount+0x31d/0x420 fs/namespace.c:4201
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf0/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f341a99acb9
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:00007fff965f4398 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f341ac15fa0 RCX: 00007f341a99acb9
RDX: 0000200000001200 RSI: 00002000000000c0 RDI: 0000200000000240
RBP: 00007f341aa08bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000280c002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f341ac15fac R14: 00007f341ac15fa0 R15: 00007f341ac15fa0
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:xfs_mount_free+0x27/0x1a0 fs/xfs/xfs_super.c:815
Code: 90 90 90 41 57 41 56 41 54 53 48 89 fb 49 bc 00 00 00 00 00 fc ff df e8 d7 f1 41 fe 4c 8d b3 a0 01 00 00 4c 89 f0 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 f7 e8 9a 24 a9 fe 4d 8b 36 4d 85 f6 74
RSP: 0018:ffffc90004077b68 EFLAGS: 00010202
RAX: 0000000000000034 RBX: 0000000000000000 RCX: ffff88816aad1d40
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000
RBP: ffffc90004077c00 R08: ffff8881b715c077 R09: 1ffff11036e2b80e
R10: dffffc0000000000 R11: ffffed1036e2b80f R12: dffffc0000000000
R13: ffff8881b715c638 R14: 00000000000001a0 R15: ffff8881b715c768
FS: 00005555782c2500(0000) GS:ffff8882a9942000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001200 CR3: 0000000174202000 CR4: 00000000000006f0
----------------
Code disassembly (best guess):
0: 90 nop
1: 90 nop
2: 90 nop
3: 41 57 push %r15
5: 41 56 push %r14
7: 41 54 push %r12
9: 53 push %rbx
a: 48 89 fb mov %rdi,%rbx
d: 49 bc 00 00 00 00 00 movabs $0xdffffc0000000000,%r12
14: fc ff df
17: e8 d7 f1 41 fe call 0xfe41f1f3
1c: 4c 8d b3 a0 01 00 00 lea 0x1a0(%rbx),%r14
23: 4c 89 f0 mov %r14,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 4c 89 f7 mov %r14,%rdi
34: e8 9a 24 a9 fe call 0xfea924d3
39: 4d 8b 36 mov (%r14),%r14
3c: 4d 85 f6 test %r14,%r14
3f: 74 .byte 0x74


***

If these findings have caused you to resend the series or submit a
separate fix, please add the following tag to your commit message:
Tested-by: syz...@syzkaller.appspotmail.com

---
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[Aleksandr Nogikh]

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