general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 1 PID: 7919 Comm: syz.0.506 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:reiserfs_get_block+0x1612/0x3ed0 fs/reiserfs/inode.c:1052 Code: 5f 04 00 00 e8 8f c0 65 ff 4d 89 f0 e9 0b 02 00 00 44 8b bc 24 40 03 00 00 4c 89 74 24 38 4d 8d 74 9e fc 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 63 0d 00 00 4c 89 fb 45 89 3e 48 8b 44 RSP: 0018:ffffc9000cab72a0 EFLAGS: 00010203 RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffff888025ccbc00 RDX: 0000000000000002 RSI: 00000000000003f4 RDI: 0000000000000000 RBP: ffffc9000cab7810 R08: ffffc9000cab777f R09: 0000000000000000 R10: ffffc9000cab7760 R11: fffff52001956ef0 R12: dffffc0000000000 R13: 00000000000003f4 R14: 000000000000000c R15: 0000000000000217 FS: 00007f26f86576c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000008027 CR3: 000000007c7e3000 CR4: 00000000003506e0 Call Trace: __block_write_begin_int+0x566/0x1ad0 fs/buffer.c:2124 reiserfs_write_begin+0x20a/0x4c0 fs/reiserfs/inode.c:2771 generic_perform_write+0x2fb/0x5b0 mm/filemap.c:4031 generic_file_write_iter+0xaf/0x2e0 mm/filemap.c:4152 do_iter_readv_writev fs/read_write.c:-1 [inline] do_iter_write+0x79a/0xc70 fs/read_write.c:860 vfs_writev fs/read_write.c:933 [inline] do_pwritev+0x205/0x340 fs/read_write.c:1030 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f26f778f749 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:00007f26f8657038 EFLAGS: 00000246 ORIG_RAX: 0000000000000148 RAX: ffffffffffffffda RBX: 00007f26f79e5fa0 RCX: 00007f26f778f749 RDX: 0000000000000001 RSI: 00002000000001c0 RDI: 0000000000000006 RBP: 00007f26f7813f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000e7b R11: 0000000000000246 R12: 0000000000000000 R13: 00007f26f79e6038 R14: 00007f26f79e5fa0 R15: 00007ffc8633c6b8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:reiserfs_get_block+0x1612/0x3ed0 fs/reiserfs/inode.c:1052 Code: 5f 04 00 00 e8 8f c0 65 ff 4d 89 f0 e9 0b 02 00 00 44 8b bc 24 40 03 00 00 4c 89 74 24 38 4d 8d 74 9e fc 4c 89 f0 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 63 0d 00 00 4c 89 fb 45 89 3e 48 8b 44 RSP: 0018:ffffc9000cab72a0 EFLAGS: 00010203 RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffff888025ccbc00 RDX: 0000000000000002 RSI: 00000000000003f4 RDI: 0000000000000000 RBP: ffffc9000cab7810 R08: ffffc9000cab777f R09: 0000000000000000 R10: ffffc9000cab7760 R11: fffff52001956ef0 R12: dffffc0000000000 R13: 00000000000003f4 R14: 000000000000000c R15: 0000000000000217 FS: 00007f26f86576c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc58cf652e8 CR3: 000000007c7e3000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000001 DR6: 00000000ffff0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 5f pop %rdi 1: 04 00 add $0x0,%al 3: 00 e8 add %ch,%al 5: 8f c0 pop %rax 7: 65 ff 4d 89 decl %gs:-0x77(%rbp) b: f0 e9 0b 02 00 00 lock jmp 0x21c 11: 44 8b bc 24 40 03 00 mov 0x340(%rsp),%r15d 18: 00 19: 4c 89 74 24 38 mov %r14,0x38(%rsp) 1e: 4d 8d 74 9e fc lea -0x4(%r14,%rbx,4),%r14 23: 4c 89 f0 mov %r14,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 63 0d 00 00 jne 0xd9a 37: 4c 89 fb mov %r15,%rbx 3a: 45 89 3e mov %r15d,(%r14) 3d: 48 rex.W 3e: 8b .byte 0x8b 3f: 44 rex.R