loop0: detected capacity change from 0 to 32768
bcachefs (/dev/loop0): error reading default superblock: Not a bcachefs superblock (got magic c68573f6-4e1a-0600-8265-f57f48ba6d81)
Oops: general protection fault, probably for non-canonical address 0xdffffc0000008ffd: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: probably user-memory-access in range [0x0000000000047fe8-0x0000000000047fef]
CPU: 0 UID: 0 PID: 5109 Comm: syz.0.0 Not tainted 6.12.0-rc4-syzkaller-00047-gc2ee9f594da8 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:gen_poly_key fs/bcachefs/checksum.c:200 [inline]
RIP: 0010:bch2_checksum+0x1c5/0x770 fs/bcachefs/checksum.c:236
Code: f6 e8 0f 2d d8 fd 48 8b 44 24 28 4c 8d b0 e8 7f 04 00 ba 20 00 00 00 48 8d 7c 24 60 31 f6 e8 f2 2c d8 fd 4c 89 f0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 f7 e8 0c 2a d8 fd 49 8b 3e 48 b8 00 00
RSP: 0018:ffffc9000b056b40 EFLAGS: 00010202
RAX: 0000000000008ffd RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc9000b056bc0
RBP: ffffc9000b056eb0 R08: ffffc9000b056bbf R09: 0000000000000000
R10: ffffc9000b056ba0 R11: fffff5200160ad78 R12: ffffc9000b056be0
R13: dffffc0000000000 R14: 0000000000047fe8 R15: 1ffff9200160ad70
FS:  00007fcc8f5266c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffca67fb198 CR3: 000000003e124000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 read_one_super+0xd87/0xf40 fs/bcachefs/super-io.c:680
 __bch2_read_super+0xe74/0x1380 fs/bcachefs/super-io.c:807
 bch2_fs_open+0x270/0x2f80 fs/bcachefs/super.c:2032
 bch2_fs_get_tree+0x738/0x1710 fs/bcachefs/fs.c:2161
 vfs_get_tree+0x90/0x2b0 fs/super.c:1800
 do_new_mount+0x2be/0xb40 fs/namespace.c:3507
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4057 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4034
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcc8e77f79a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fcc8f525e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fcc8f525ef0 RCX: 00007fcc8e77f79a
RDX: 00000000200058c0 RSI: 0000000020005900 RDI: 00007fcc8f525eb0
RBP: 00000000200058c0 R08: 00007fcc8f525ef0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020005900
R13: 00007fcc8f525eb0 R14: 00000000000058e5 R15: 0000000020000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:gen_poly_key fs/bcachefs/checksum.c:200 [inline]
RIP: 0010:bch2_checksum+0x1c5/0x770 fs/bcachefs/checksum.c:236
Code: f6 e8 0f 2d d8 fd 48 8b 44 24 28 4c 8d b0 e8 7f 04 00 ba 20 00 00 00 48 8d 7c 24 60 31 f6 e8 f2 2c d8 fd 4c 89 f0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 f7 e8 0c 2a d8 fd 49 8b 3e 48 b8 00 00
RSP: 0018:ffffc9000b056b40 EFLAGS: 00010202
RAX: 0000000000008ffd RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc9000b056bc0
RBP: ffffc9000b056eb0 R08: ffffc9000b056bbf R09: 0000000000000000
R10: ffffc9000b056ba0 R11: fffff5200160ad78 R12: ffffc9000b056be0
R13: dffffc0000000000 R14: 0000000000047fe8 R15: 1ffff9200160ad70
FS:  00007fcc8f5266c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000564244b67000 CR3: 000000003e124000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	f6 e8                	imul   %al
   2:	0f 2d d8             	cvtps2pi %xmm0,%mm3
   5:	fd                   	std
   6:	48 8b 44 24 28       	mov    0x28(%rsp),%rax
   b:	4c 8d b0 e8 7f 04 00 	lea    0x47fe8(%rax),%r14
  12:	ba 20 00 00 00       	mov    $0x20,%edx
  17:	48 8d 7c 24 60       	lea    0x60(%rsp),%rdi
  1c:	31 f6                	xor    %esi,%esi
  1e:	e8 f2 2c d8 fd       	call   0xfdd82d15
  23:	4c 89 f0             	mov    %r14,%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 f7             	mov    %r14,%rdi
  34:	e8 0c 2a d8 fd       	call   0xfdd82a45
  39:	49 8b 3e             	mov    (%r14),%rdi
  3c:	48                   	rex.W
  3d:	b8                   	.byte 0xb8