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: 17391 Comm: syz-executor.3 Not tainted 6.2.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 RIP: 0010:prepare_for_delete_or_cut+0x18d/0x2210 Code: d8 48 c1 e8 03 49 bf 00 00 00 00 00 fc ff df 42 0f b6 04 38 84 c0 0f 85 a7 17 00 00 4c 63 33 49 83 c4 28 4c 89 e0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 e7 e8 24 ab b4 ff 4d 8b 3c 24 48 b8 00 RSP: 0018:ffffc9000376f200 EFLAGS: 00010206 RAX: 0000000000000005 RBX: ffffc9000376f9c0 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000008 RBP: ffffc9000376f368 R08: ffffffff8229de60 R09: ffffc9000376f830 R10: 0000000000000002 R11: ffff888022d757c0 R12: 0000000000000028 R13: ffff88803c5bc000 R14: 0000000000000000 R15: dffffc0000000000 FS: 00005555573d7400(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055555665c708 CR3: 000000007d3c0000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: reiserfs_cut_from_item+0x372/0x25a0 reiserfs_do_truncate+0x988/0x1550 reiserfs_truncate_file+0x463/0x790 reiserfs_file_release+0x88d/0xa40 __fput+0x3b7/0x890 task_work_run+0x24a/0x300 exit_to_user_mode_loop+0xd1/0xf0 exit_to_user_mode_prepare+0xb1/0x140 syscall_exit_to_user_mode+0x54/0x2d0 do_syscall_64+0x4d/0xc0 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fb7c063df7b Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44 RSP: 002b:00007ffe54b25450 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000006 RCX: 00007fb7c063df7b RDX: 00007fb7c0201578 RSI: ffffffffffffffff RDI: 0000000000000005 RBP: 00007fb7c07ad980 R08: 0000000000000000 R09: 00007fb7c0200000 R10: 00007fb7c0201580 R11: 0000000000000293 R12: 00000000000b0d7a R13: 00007ffe54b25550 R14: 00007fb7c07abf80 R15: 0000000000000032 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:prepare_for_delete_or_cut+0x18d/0x2210 Code: d8 48 c1 e8 03 49 bf 00 00 00 00 00 fc ff df 42 0f b6 04 38 84 c0 0f 85 a7 17 00 00 4c 63 33 49 83 c4 28 4c 89 e0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 e7 e8 24 ab b4 ff 4d 8b 3c 24 48 b8 00 RSP: 0018:ffffc9000376f200 EFLAGS: 00010206 RAX: 0000000000000005 RBX: ffffc9000376f9c0 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000008 RBP: ffffc9000376f368 R08: ffffffff8229de60 R09: ffffc9000376f830 R10: 0000000000000002 R11: ffff888022d757c0 R12: 0000000000000028 R13: ffff88803c5bc000 R14: 0000000000000000 R15: dffffc0000000000 FS: 00005555573d7400(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8407154000 CR3: 000000007d3c0000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 48 c1 e8 03 shr $0x3,%rax 4: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15 b: fc ff df e: 42 0f b6 04 38 movzbl (%rax,%r15,1),%eax 13: 84 c0 test %al,%al 15: 0f 85 a7 17 00 00 jne 0x17c2 1b: 4c 63 33 movslq (%rbx),%r14 1e: 49 83 c4 28 add $0x28,%r12 22: 4c 89 e0 mov %r12,%rax 25: 48 c1 e8 03 shr $0x3,%rax * 29: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 e7 mov %r12,%rdi 33: e8 24 ab b4 ff callq 0xffb4ab5c 38: 4d 8b 3c 24 mov (%r12),%r15 3c: 48 rex.W 3d: b8 .byte 0xb8