REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage. REISERFS warning: reiserfs-5093 is_leaf: item entry count seems wrong *3.5*[2 4106499 0(1) DIR], item_len 35, item_location 3757, free_space(entry_count) 2 REISERFS error (device loop0): vs-5150 search_by_key: invalid format found in block 532. Fsck? REISERFS (device loop0): Remounting filesystem read-only general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f] CPU: 1 PID: 4425 Comm: syz.0.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 RIP: 0010:reiserfs_node_data fs/reiserfs/reiserfs.h:2184 [inline] RIP: 0010:item_head fs/reiserfs/reiserfs.h:2200 [inline] RIP: 0010:tp_item_head fs/reiserfs/reiserfs.h:2226 [inline] RIP: 0010:direct2indirect+0x79c/0x1480 fs/reiserfs/tail_conversion.c:119 Code: 49 c1 e7 04 4b 8d 5c 3e 08 48 89 d8 48 c1 e8 03 0f b6 04 10 84 c0 0f 85 b7 03 00 00 4c 63 33 49 83 c4 28 4c 89 e0 48 c1 e8 03 <80> 3c 10 00 74 12 4c 89 e7 e8 56 52 b9 ff 48 ba 00 00 00 00 00 fc RSP: 0018:ffffc900041e7080 EFLAGS: 00010206 RAX: 0000000000000005 RBX: ffffc900041e7590 RCX: ffff88802b8a0000 RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000008 RBP: ffffc900041e7210 R08: ffff88802b8a0000 R09: 0000000000000002 R10: 00000000fffffffe R11: 0000000000000000 R12: 0000000000000028 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000010 FS: 000055558c15b500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000002714f000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: reiserfs_get_block+0x3c25/0x3ef0 fs/reiserfs/inode.c:949 __block_write_begin_int+0x54b/0x1a70 fs/buffer.c:1991 reiserfs_write_begin+0x206/0x4c0 fs/reiserfs/inode.c:2775 generic_perform_write+0x2db/0x560 mm/filemap.c:3846 __generic_file_write_iter+0x172/0x430 mm/filemap.c:3974 generic_file_write_iter+0xab/0x2e0 mm/filemap.c:4006 do_iter_readv_writev fs/read_write.c:-1 [inline] do_iter_write+0x62d/0xaf0 fs/read_write.c:861 vfs_writev fs/read_write.c:934 [inline] do_writev+0x24e/0x410 fs/read_write.c:977 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f893c38eba9 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:00007ffe079fbbc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 00007f893c5d5fa0 RCX: 00007f893c38eba9 RDX: 0000000000000002 RSI: 00002000000013c0 RDI: 0000000000000004 RBP: 00007f893c411e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f893c5d5fa0 R14: 00007f893c5d5fa0 R15: 0000000000000003 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:reiserfs_node_data fs/reiserfs/reiserfs.h:2184 [inline] RIP: 0010:item_head fs/reiserfs/reiserfs.h:2200 [inline] RIP: 0010:tp_item_head fs/reiserfs/reiserfs.h:2226 [inline] RIP: 0010:direct2indirect+0x79c/0x1480 fs/reiserfs/tail_conversion.c:119 Code: 49 c1 e7 04 4b 8d 5c 3e 08 48 89 d8 48 c1 e8 03 0f b6 04 10 84 c0 0f 85 b7 03 00 00 4c 63 33 49 83 c4 28 4c 89 e0 48 c1 e8 03 <80> 3c 10 00 74 12 4c 89 e7 e8 56 52 b9 ff 48 ba 00 00 00 00 00 fc RSP: 0018:ffffc900041e7080 EFLAGS: 00010206 RAX: 0000000000000005 RBX: ffffc900041e7590 RCX: ffff88802b8a0000 RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000008 RBP: ffffc900041e7210 R08: ffff88802b8a0000 R09: 0000000000000002 R10: 00000000fffffffe R11: 0000000000000000 R12: 0000000000000028 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000010 FS: 000055558c15b500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000002714f000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 49 c1 e7 04 shl $0x4,%r15 4: 4b 8d 5c 3e 08 lea 0x8(%r14,%r15,1),%rbx 9: 48 89 d8 mov %rbx,%rax c: 48 c1 e8 03 shr $0x3,%rax 10: 0f b6 04 10 movzbl (%rax,%rdx,1),%eax 14: 84 c0 test %al,%al 16: 0f 85 b7 03 00 00 jne 0x3d3 1c: 4c 63 33 movslq (%rbx),%r14 1f: 49 83 c4 28 add $0x28,%r12 23: 4c 89 e0 mov %r12,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 10 00 cmpb $0x0,(%rax,%rdx,1) <-- trapping instruction 2e: 74 12 je 0x42 30: 4c 89 e7 mov %r12,%rdi 33: e8 56 52 b9 ff call 0xffb9528e 38: 48 rex.W 39: ba 00 00 00 00 mov $0x0,%edx 3e: 00 fc add %bh,%ah