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REISERFS panic (device loop2): PAP-5580 reiserfs_cut_from_item: item to convert does not exist ([2 5 0x1 IND])
------------[ cut here ]------------
kernel BUG at fs/reiserfs/prints.c:390!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 4742 Comm: syz.2.80 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__reiserfs_panic+0x13a/0x140 fs/reiserfs/prints.c:390
Code: c7 c1 20 4e 1b 8a 48 0f 44 c8 4c 0f 44 f0 48 c7 c7 e0 4e 1b 8a 4c 89 fe 4c 89 f2 49 89 d8 49 c7 c1 20 5e 1d 96 e8 96 51 ff ff <0f> 0b 0f 1f 40 00 53 48 89 fb e8 97 ae df f7 48 c7 c7 a0 57 1b 8a
RSP: 0018:ffffc900041def00 EFLAGS: 00010246
RAX: 000000000000006e RBX: ffffffff8bb0496a RCX: 18bf839c879c5f00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc900041deff0 R08: dffffc0000000000 R09: ffffed10172267b0
R10: ffffed10172267b0 R11: 1ffff110172267af R12: ffffffff8a1b6cc0
R13: ffffc900041def20 R14: ffffffff8a1b6ca0 R15: ffff888025a966a8
FS:  0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa0b0612000 CR3: 00000000636be000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 reiserfs_cut_from_item+0x1926/0x1ef0 fs/reiserfs/stree.c:1729
 reiserfs_do_truncate+0xa90/0x13e0 fs/reiserfs/stree.c:1973
 reiserfs_truncate_file+0x632/0xdc0 fs/reiserfs/inode.c:2318
 reiserfs_file_release+0x8e0/0xa50 fs/reiserfs/file.c:109
 __fput+0x234/0x930 fs/file_table.c:311
 task_work_run+0x125/0x1a0 kernel/task_work.c:188
 exit_task_work include/linux/task_work.h:33 [inline]
 do_exit+0x61e/0x20a0 kernel/exit.c:883
 do_group_exit+0x12e/0x300 kernel/exit.c:997
 get_signal+0x6ca/0x12c0 kernel/signal.c:2900
 arch_do_signal_or_restart+0xc1/0x1300 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
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f05b1eef749
Code: Unable to access opcode bytes at RIP 0x7f05b1eef71f.
RSP: 002b:00007f05b0135038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: 0000000000000118 RBX: 00007f05b2146090 RCX: 00007f05b1eef749
RDX: 0000000000000118 RSI: 0000200000000180 RDI: 0000000000000007
RBP: 00007f05b1f73f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f05b2146128 R14: 00007f05b2146090 R15: 00007ffe310f6898
 </TASK>
Modules linked in:
---[ end trace b938c843984ebd89 ]---
RIP: 0010:__reiserfs_panic+0x13a/0x140 fs/reiserfs/prints.c:390
Code: c7 c1 20 4e 1b 8a 48 0f 44 c8 4c 0f 44 f0 48 c7 c7 e0 4e 1b 8a 4c 89 fe 4c 89 f2 49 89 d8 49 c7 c1 20 5e 1d 96 e8 96 51 ff ff <0f> 0b 0f 1f 40 00 53 48 89 fb e8 97 ae df f7 48 c7 c7 a0 57 1b 8a
RSP: 0018:ffffc900041def00 EFLAGS: 00010246
RAX: 000000000000006e RBX: ffffffff8bb0496a RCX: 18bf839c879c5f00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc900041deff0 R08: dffffc0000000000 R09: ffffed10172267b0
R10: ffffed10172267b0 R11: 1ffff110172267af R12: ffffffff8a1b6cc0
R13: ffffc900041def20 R14: ffffffff8a1b6ca0 R15: ffff888025a966a8
FS:  0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2232779368 CR3: 00000000636be000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400