Hello, syzbot found the following issue on: HEAD commit: f9f24ca362a4 Add linux-next specific files for 20241031 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=162bc6f7980000 kernel config: https://syzkaller.appspot.com/x/.config?x=328572ed4d152be9 dashboard link: https://syzkaller.appspot.com/bug?extid=6cb1e1ecb22a749ef8e8 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14f92630580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=126b655f980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/eb84549dd6b3/disk-f9f24ca3.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/beb29bdfa297/vmlinux-f9f24ca3.xz kernel image: https://storage.googleapis.com/syzbot-assets/8881fe3245ad/bzImage-f9f24ca3.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6cb1e1ecb22a749ef8e8@xxxxxxxxxxxxxxxxxxxxxxxxx Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 1 UID: 0 PID: 5845 Comm: syz-executor422 Not tainted 6.12.0-rc5-next-20241031-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:io_uring_show_fdinfo+0xeed/0x1810 io_uring/fdinfo.c:181 Code: 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 cb 68 3c f6 48 8b 1b 48 83 c3 18 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 a5 68 3c f6 4d 89 fe 48 8b 1b 48 89 RSP: 0018:ffffc9000352f700 EFLAGS: 00010206 RAX: 0000000000000003 RBX: 0000000000000018 RCX: dffffc0000000000 RDX: ffff888030040000 RSI: 0000000000000003 RDI: 0000000000000000 RBP: ffffc9000352f940 R08: ffffffff8bc2f00d R09: 1ffff1100690201f R10: dffffc0000000000 R11: ffffed1006902020 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff888034e26128 R15: ffff888034e26120 FS: 00005555693ab380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000564acb56e0d8 CR3: 000000007f2d0000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> seq_show+0x608/0x770 fs/proc/fd.c:68 seq_read_iter+0x43f/0xd70 fs/seq_file.c:230 seq_read+0x3a9/0x4f0 fs/seq_file.c:162 do_loop_readv_writev fs/read_write.c:854 [inline] vfs_readv+0x6bc/0xa80 fs/read_write.c:1027 do_preadv fs/read_write.c:1142 [inline] __do_sys_preadv fs/read_write.c:1192 [inline] __se_sys_preadv fs/read_write.c:1187 [inline] __x64_sys_preadv+0x1c7/0x2d0 fs/read_write.c:1187 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7f677d1669 Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffecebd7a78 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 00007ffecebd7a80 RCX: 00007f7f677d1669 RDX: 0000000000000001 RSI: 0000000020000640 RDI: 0000000000000004 RBP: 00007f7f67844610 R08: 0000000000000000 R09: 68742f636f72702f R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffecebd7cb8 R14: 0000000000000001 R15: 0000000000000001 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:io_uring_show_fdinfo+0xeed/0x1810 io_uring/fdinfo.c:181 Code: 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 cb 68 3c f6 48 8b 1b 48 83 c3 18 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 a5 68 3c f6 4d 89 fe 48 8b 1b 48 89 RSP: 0018:ffffc9000352f700 EFLAGS: 00010206 RAX: 0000000000000003 RBX: 0000000000000018 RCX: dffffc0000000000 RDX: ffff888030040000 RSI: 0000000000000003 RDI: 0000000000000000 RBP: ffffc9000352f940 R08: ffffffff8bc2f00d R09: 1ffff1100690201f R10: dffffc0000000000 R11: ffffed1006902020 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff888034e26128 R15: ffff888034e26120 FS: 00005555693ab380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000008 CR3: 000000007f2d0000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 4 bytes skipped: 0: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) 4: 74 08 je 0xe 6: 48 89 df mov %rbx,%rdi 9: e8 cb 68 3c f6 call 0xf63c68d9 e: 48 8b 1b mov (%rbx),%rbx 11: 48 83 c3 18 add $0x18,%rbx 15: 48 89 d8 mov %rbx,%rax 18: 48 c1 e8 03 shr $0x3,%rax 1c: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 23: fc ff df * 26: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2a: 74 08 je 0x34 2c: 48 89 df mov %rbx,%rdi 2f: e8 a5 68 3c f6 call 0xf63c68d9 34: 4d 89 fe mov %r15,%r14 37: 48 8b 1b mov (%rbx),%rbx 3a: 48 rex.W 3b: 89 .byte 0x89 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
