loop0: detected capacity change from 0 to 64
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
CPU: 0 UID: 0 PID: 5312 Comm: syz-executor160 Not tainted 6.12.0-rc7-syzkaller-00125-gcfaaa7d010d1 #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:bfs_move_block fs/bfs/file.c:43 [inline]
RIP: 0010:bfs_move_blocks fs/bfs/file.c:57 [inline]
RIP: 0010:bfs_get_block+0xa75/0xb70 fs/bfs/file.c:126
Code: 00 41 8b 0f b8 77 7f ff ff 21 c1 81 c9 08 80 00 00 4c 89 ef 4c 89 f6 e8 d9 12 a0 ff 49 89 c5 48 8d 68 28 48 89 e8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 ef e8 3c 6f 7b ff 4c 8b 75 00 48 8d 7b
RSP: 0018:ffffc9000cfd7870 EFLAGS: 00010206
RAX: 0000000000000005 RBX: ffff8880479293a0 RCX: ffff88801f8c8000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000028 R08: ffffffff82236dd7 R09: 1ffffd400022314e
R10: dffffc0000000000 R11: fffff9400022314f R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000054 R15: ffff8880008cce68
FS: 0000555570718380(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000043b1c000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
__block_write_begin_int+0x50c/0x1a70 fs/buffer.c:2121
block_write_begin+0x8f/0x120 fs/buffer.c:2231
bfs_write_begin+0x35/0xd0 fs/bfs/file.c:179
generic_perform_write+0x344/0x6d0 mm/filemap.c:4054
generic_file_write_iter+0xae/0x310 mm/filemap.c:4181
new_sync_write fs/read_write.c:590 [inline]
vfs_write+0xaeb/0xd30 fs/read_write.c:683
ksys_write+0x183/0x2b0 fs/read_write.c:736
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: 0033:0x7f1355821db9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe17b1ddc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f135586b066 RCX: 00007f1355821db9
RDX: 000000000000fecc RSI: 0000000020000100 RDI: 0000000000000008
RBP: 00007f1355895610 R08: 00007ffe17b1df98 R09: 00007ffe17b1df98
R10: 00007ffe17b1df98 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe17b1df88 R14: 0000000000000001 R15: 0000000000000001
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bfs_move_block fs/bfs/file.c:43 [inline]
RIP: 0010:bfs_move_blocks fs/bfs/file.c:57 [inline]
RIP: 0010:bfs_get_block+0xa75/0xb70 fs/bfs/file.c:126
Code: 00 41 8b 0f b8 77 7f ff ff 21 c1 81 c9 08 80 00 00 4c 89 ef 4c 89 f6 e8 d9 12 a0 ff 49 89 c5 48 8d 68 28 48 89 e8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 ef e8 3c 6f 7b ff 4c 8b 75 00 48 8d 7b
RSP: 0018:ffffc9000cfd7870 EFLAGS: 00010206
RAX: 0000000000000005 RBX: ffff8880479293a0 RCX: ffff88801f8c8000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000028 R08: ffffffff82236dd7 R09: 1ffffd400022314e
R10: dffffc0000000000 R11: fffff9400022314f R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000054 R15: ffff8880008cce68
FS: 0000555570718380(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000043b1c000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 41 8b 0f mov (%r15),%ecx
3: b8 77 7f ff ff mov $0xffff7f77,%eax
8: 21 c1 and %eax,%ecx
a: 81 c9 08 80 00 00 or $0x8008,%ecx
10: 4c 89 ef mov %r13,%rdi
13: 4c 89 f6 mov %r14,%rsi
16: e8 d9 12 a0 ff call 0xffa012f4
1b: 49 89 c5 mov %rax,%r13
1e: 48 8d 68 28 lea 0x28(%rax),%rbp
22: 48 89 e8 mov %rbp,%rax
25: 48 c1 e8 03 shr $0x3,%rax
* 29: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction
2e: 74 08 je 0x38
30: 48 89 ef mov %rbp,%rdi
33: e8 3c 6f 7b ff call 0xff7b6f74
38: 4c 8b 75 00 mov 0x0(%rbp),%r14
3c: 48 rex.W
3d: 8d .byte 0x8d
3e: 7b .byte 0x7b