REISERFS (device loop0): checking transaction log (loop0) REISERFS (device loop0): Using r5 hash to sort names REISERFS (device loop0): using 3.5.x disk format REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage. REISERFS warning: reiserfs-5093 is_leaf: item entry count seems wrong *3.5*[2 1 0(1) DIR], item_len 35, item_location 4029, 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: 4591 Comm: syz-executor.0 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+0x703/0x10d0 fs/reiserfs/tail_conversion.c:119 Code: c1 e3 04 49 8d 5c 1e 08 48 89 d8 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 5d 03 00 00 4c 63 23 49 83 c7 28 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 6e 7d be ff 49 8b 1f 4f 8d 3c 64 RSP: 0018:ffffc90002e6f1a0 EFLAGS: 00010206 RAX: 0000000000000005 RBX: ffffc90002e6f6b0 RCX: ffff8880179b8000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000008 RBP: ffffc90002e6f330 R08: ffff8880179b8000 R09: 0000000000000002 R10: 00000000fffffffe R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: ffffc90002e6f698 R15: 0000000000000028 FS: 00007f15cc8186c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc9f39cf9c CR3: 0000000027219000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: reiserfs_get_block+0x3e27/0x4100 fs/reiserfs/inode.c:957 __block_write_begin_int+0x54e/0x15a0 fs/buffer.c:2012 reiserfs_write_begin+0x34b/0x810 fs/reiserfs/inode.c:2790 generic_cont_expand_simple+0xe9/0x190 fs/buffer.c:2362 reiserfs_setattr+0x42f/0x1010 fs/reiserfs/inode.c:3319 notify_change+0xbcd/0xee0 fs/attr.c:505 do_truncate+0x197/0x220 fs/open.c:65 do_sys_ftruncate+0x31b/0x3d0 fs/open.c:193 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f15cd496959 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f15cc8180c8 EFLAGS: 00000246 ORIG_RAX: 000000000000004d RAX: ffffffffffffffda RBX: 00007f15cd5b5f80 RCX: 00007f15cd496959 RDX: 0000000000000000 RSI: 0000000000000f88 RDI: 0000000000000004 RBP: 00007f15cd4f2c88 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f15cd5b5f80 R15: 00007ffdaab03be8 Modules linked in: ---[ end trace a75d8c9dab70ce9a ]--- 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+0x703/0x10d0 fs/reiserfs/tail_conversion.c:119 Code: c1 e3 04 49 8d 5c 1e 08 48 89 d8 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 5d 03 00 00 4c 63 23 49 83 c7 28 4c 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 ff e8 6e 7d be ff 49 8b 1f 4f 8d 3c 64 RSP: 0018:ffffc90002e6f1a0 EFLAGS: 00010206 RAX: 0000000000000005 RBX: ffffc90002e6f6b0 RCX: ffff8880179b8000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000008 RBP: ffffc90002e6f330 R08: ffff8880179b8000 R09: 0000000000000002 R10: 00000000fffffffe R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: ffffc90002e6f698 R15: 0000000000000028 FS: 00007f15cc8186c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000056485ce4f950 CR3: 0000000027219000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: c1 e3 04 shl $0x4,%ebx 3: 49 8d 5c 1e 08 lea 0x8(%r14,%rbx,1),%rbx 8: 48 89 d8 mov %rbx,%rax b: 48 c1 e8 03 shr $0x3,%rax f: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax 14: 84 c0 test %al,%al 16: 0f 85 5d 03 00 00 jne 0x379 1c: 4c 63 23 movslq (%rbx),%r12 1f: 49 83 c7 28 add $0x28,%r15 23: 4c 89 f8 mov %r15,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 ff mov %r15,%rdi 34: e8 6e 7d be ff call 0xffbe7da7 39: 49 8b 1f mov (%r15),%rbx 3c: 4f 8d 3c 64 lea (%r12,%r12,2),%r15