Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f] CPU: 0 UID: 0 PID: 27339 Comm: syz.8.5820 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 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+0x589/0xae0 fs/bfs/file.c:126 Code: f8 48 c1 e8 03 42 80 3c 20 00 74 05 e8 f0 46 8d ff 49 8b 5d 20 4d 8d 66 28 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 48 8b 6c 24 18 74 08 4c 89 e7 e8 c4 46 8d ff 4c 89 ef RSP: 0018:ffffc9000c8ef638 EFLAGS: 00010216 RAX: 0000000000000005 RBX: 0000000000000200 RCX: dffffc0000000000 RDX: ffffc900100f7000 RSI: 0000000000000648 RDI: ffff888078365b00 RBP: ffff88802293c2f0 R08: ffffea0001192537 R09: 1ffffd40002324a6 R10: dffffc0000000000 R11: fffff940002324a7 R12: 0000000000000028 R13: ffff888078365ae0 R14: 0000000000000000 R15: 000000000000000a FS: 00007f0ba83f86c0(0000) GS:ffff888126139000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000006000 CR3: 000000003fb76000 CR4: 0000000000350ef0 Call Trace: __block_write_begin_int+0x6b5/0x1900 fs/buffer.c:2145 block_write_begin+0x8a/0x120 fs/buffer.c:2256 bfs_write_begin+0x35/0xd0 fs/bfs/file.c:180 generic_perform_write+0x2c5/0x900 mm/filemap.c:4254 generic_file_write_iter+0x117/0x550 mm/filemap.c:4397 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x5c9/0xb30 fs/read_write.c:686 ksys_write+0x145/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0ba758f749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f0ba83f8038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f0ba77e6090 RCX: 00007f0ba758f749 RDX: 0000000000001006 RSI: 0000200000000480 RDI: 0000000000000004 RBP: 00007f0ba7613f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0ba77e6128 R14: 00007f0ba77e6090 R15: 00007fff59d86798 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+0x589/0xae0 fs/bfs/file.c:126 Code: f8 48 c1 e8 03 42 80 3c 20 00 74 05 e8 f0 46 8d ff 49 8b 5d 20 4d 8d 66 28 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 48 8b 6c 24 18 74 08 4c 89 e7 e8 c4 46 8d ff 4c 89 ef RSP: 0018:ffffc9000c8ef638 EFLAGS: 00010216 RAX: 0000000000000005 RBX: 0000000000000200 RCX: dffffc0000000000 RDX: ffffc900100f7000 RSI: 0000000000000648 RDI: ffff888078365b00 RBP: ffff88802293c2f0 R08: ffffea0001192537 R09: 1ffffd40002324a6 R10: dffffc0000000000 R11: fffff940002324a7 R12: 0000000000000028 R13: ffff888078365ae0 R14: 0000000000000000 R15: 000000000000000a FS: 00007f0ba83f86c0(0000) GS:ffff888126239000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0ba83f7f98 CR3: 000000003fb76000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess): 0: f8 clc 1: 48 c1 e8 03 shr $0x3,%rax 5: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) a: 74 05 je 0x11 c: e8 f0 46 8d ff call 0xff8d4701 11: 49 8b 5d 20 mov 0x20(%r13),%rbx 15: 4d 8d 66 28 lea 0x28(%r14),%r12 19: 4c 89 e0 mov %r12,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2e: 48 8b 6c 24 18 mov 0x18(%rsp),%rbp 33: 74 08 je 0x3d 35: 4c 89 e7 mov %r12,%rdi 38: e8 c4 46 8d ff call 0xff8d4701 3d: 4c 89 ef mov %r13,%rdi