general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f] CPU: 0 PID: 4551 Comm: syz-executor.0 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:bfs_move_block fs/bfs/file.c:42 [inline] RIP: 0010:bfs_move_blocks fs/bfs/file.c:56 [inline] RIP: 0010:bfs_get_block+0x7ad/0xa60 fs/bfs/file.c:125 Code: 4c 89 f9 4d 89 f7 4a 8d 34 30 48 89 cd 8b 11 48 89 df b9 08 00 00 00 e8 e1 ca ad ff 49 89 c6 48 8d 58 28 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 f4 e3 93 ff 48 8b 1b 49 8d 7d 28 RSP: 0018:ffffc90002eeede0 EFLAGS: 00010206 RAX: 0000000000000005 RBX: 0000000000000028 RCX: ffff888022e10000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff88802b090018 R08: ffffea0001bd46b7 R09: 1ffffd400037a8d6 R10: dffffc0000000000 R11: fffff9400037a8d7 R12: dffffc0000000000 R13: ffff888074bb22b8 R14: 0000000000000000 R15: 0000000000000022 FS: 00007efd2a6af6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007efd2a6af568 CR3: 000000007373d000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __block_write_begin_int+0x565/0x15d0 fs/buffer.c:2012 __block_write_begin fs/buffer.c:2062 [inline] block_write_begin+0x4d/0xc0 fs/buffer.c:2122 bfs_write_begin+0x37/0xd0 fs/bfs/file.c:177 generic_perform_write+0x2b6/0x550 mm/filemap.c:3785 __generic_file_write_iter+0x25f/0x4e0 mm/filemap.c:3912 generic_file_write_iter+0xa6/0x1b0 mm/filemap.c:3944 __kernel_write+0x51c/0x970 fs/read_write.c:539 __dump_emit+0x249/0x370 fs/coredump.c:943 elf_core_dump+0x29dc/0x3500 fs/binfmt_elf.c:2264 do_coredump+0x14c7/0x2ac0 fs/coredump.c:894 get_signal+0x410/0x12d0 kernel/signal.c:2886 arch_do_signal_or_restart+0xe7/0x12c0 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:154 [inline] exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214 irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:320 exc_page_fault+0x88/0x100 arch/x86/mm/fault.c:1499 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606 RIP: 0033:0x0 Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6. RSP: 002b:0000000020000008 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007efd2b45cf80 RCX: 00007efd2b31df39 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000000 RBP: 00007efd2b3939d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007efd2b45cf80 R15: 00007ffead0a89f8 Modules linked in: ---[ end trace fdfa3f0d8c927d04 ]--- RIP: 0010:bfs_move_block fs/bfs/file.c:42 [inline] RIP: 0010:bfs_move_blocks fs/bfs/file.c:56 [inline] RIP: 0010:bfs_get_block+0x7ad/0xa60 fs/bfs/file.c:125 Code: 4c 89 f9 4d 89 f7 4a 8d 34 30 48 89 cd 8b 11 48 89 df b9 08 00 00 00 e8 e1 ca ad ff 49 89 c6 48 8d 58 28 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 f4 e3 93 ff 48 8b 1b 49 8d 7d 28 RSP: 0018:ffffc90002eeede0 EFLAGS: 00010206 RAX: 0000000000000005 RBX: 0000000000000028 RCX: ffff888022e10000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff88802b090018 R08: ffffea0001bd46b7 R09: 1ffffd400037a8d6 R10: dffffc0000000000 R11: fffff9400037a8d7 R12: dffffc0000000000 R13: ffff888074bb22b8 R14: 0000000000000000 R15: 0000000000000022 FS: 00007efd2a6af6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffead0a8ad8 CR3: 000000007373d000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 4c 89 f9 mov %r15,%rcx 3: 4d 89 f7 mov %r14,%r15 6: 4a 8d 34 30 lea (%rax,%r14,1),%rsi a: 48 89 cd mov %rcx,%rbp d: 8b 11 mov (%rcx),%edx f: 48 89 df mov %rbx,%rdi 12: b9 08 00 00 00 mov $0x8,%ecx 17: e8 e1 ca ad ff call 0xffadcafd 1c: 49 89 c6 mov %rax,%r14 1f: 48 8d 58 28 lea 0x28(%rax),%rbx 23: 48 89 d8 mov %rbx,%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: 48 89 df mov %rbx,%rdi 34: e8 f4 e3 93 ff call 0xff93e42d 39: 48 8b 1b mov (%rbx),%rbx 3c: 49 8d 7d 28 lea 0x28(%r13),%rdi