Hello, syzbot found the following issue on: HEAD commit: 0b58e108042b Add linux-next specific files for 20240703 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=15de4eb9980000 kernel config: https://syzkaller.appspot.com/x/.config?x=ed034204f2e40e53 dashboard link: https://syzkaller.appspot.com/bug?extid=380f7022f450dd776e64 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/1d079762feae/disk-0b58e108.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e53996c8d8c2/vmlinux-0b58e108.xz kernel image: https://storage.googleapis.com/syzbot-assets/a0bf21cdd844/bzImage-0b58e108.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+380f7022f450dd776e64@xxxxxxxxxxxxxxxxxxxxxxxxx Oops: general protection fault, probably for non-canonical address 0xdffffc0000000007: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f] CPU: 0 UID: 0 PID: 8647 Comm: syz.3.1455 Not tainted 6.10.0-rc6-next-20240703-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 RIP: 0010:bpf_net_ctx_get_ri include/linux/filter.h:788 [inline] RIP: 0010:xdp_do_generic_redirect+0x7e/0x8f0 net/core/filter.c:4525 Code: 3c 01 00 74 12 48 89 df e8 9f 26 90 f8 48 b8 00 00 00 00 00 fc ff df 48 89 5c 24 48 48 8b 1b 4c 8d 73 38 4d 89 f7 49 c1 ef 03 <41> 0f b6 04 07 84 c0 0f 85 37 06 00 00 41 8b 2e 89 ee 83 e6 02 31 RSP: 0018:ffffc900094777f8 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffff1100fd9f6c0 RDX: ffffc900042a9000 RSI: 0000000000001ab7 RDI: 0000000000001ab8 RBP: ffffc900094779b0 R08: 0000000000000005 R09: ffffffff89601c5e R10: 0000000000000003 R11: ffff88807ecf9e00 R12: ffffc90009477b60 R13: 1ffff9200128ef1c R14: 0000000000000038 R15: 0000000000000007 FS: 00007fa9faca56c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020011000 CR3: 000000002c750000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> do_xdp_generic+0x884/0xb90 net/core/dev.c:5138 tun_get_user+0x2805/0x4560 drivers/net/tun.c:1924 tun_chr_write_iter+0x113/0x1f0 drivers/net/tun.c:2048 new_sync_write fs/read_write.c:497 [inline] vfs_write+0xa72/0xc90 fs/read_write.c:590 ksys_write+0x1a0/0x2c0 fs/read_write.c:643 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: 0033:0x7fa9f9f7475f Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 29 8c 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 7c 8c 02 00 48 RSP: 002b:00007fa9faca5010 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fa9fa103f60 RCX: 00007fa9f9f7475f RDX: 000000000000fdef RSI: 0000000020001540 RDI: 00000000000000c8 RBP: 00007fa9f9fe4aa1 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000fdef R11: 0000000000000293 R12: 0000000000000000 R13: 000000000000000b R14: 00007fa9fa103f60 R15: 00007fff952046f8 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:bpf_net_ctx_get_ri include/linux/filter.h:788 [inline] RIP: 0010:xdp_do_generic_redirect+0x7e/0x8f0 net/core/filter.c:4525 Code: 3c 01 00 74 12 48 89 df e8 9f 26 90 f8 48 b8 00 00 00 00 00 fc ff df 48 89 5c 24 48 48 8b 1b 4c 8d 73 38 4d 89 f7 49 c1 ef 03 <41> 0f b6 04 07 84 c0 0f 85 37 06 00 00 41 8b 2e 89 ee 83 e6 02 31 RSP: 0018:ffffc900094777f8 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffff1100fd9f6c0 RDX: ffffc900042a9000 RSI: 0000000000001ab7 RDI: 0000000000001ab8 RBP: ffffc900094779b0 R08: 0000000000000005 R09: ffffffff89601c5e R10: 0000000000000003 R11: ffff88807ecf9e00 R12: ffffc90009477b60 R13: 1ffff9200128ef1c R14: 0000000000000038 R15: 0000000000000007 FS: 00007fa9faca56c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020011000 CR3: 000000002c750000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 3c 01 cmp $0x1,%al 2: 00 74 12 48 add %dh,0x48(%rdx,%rdx,1) 6: 89 df mov %ebx,%edi 8: e8 9f 26 90 f8 call 0xf89026ac d: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 14: fc ff df 17: 48 89 5c 24 48 mov %rbx,0x48(%rsp) 1c: 48 8b 1b mov (%rbx),%rbx 1f: 4c 8d 73 38 lea 0x38(%rbx),%r14 23: 4d 89 f7 mov %r14,%r15 26: 49 c1 ef 03 shr $0x3,%r15 * 2a: 41 0f b6 04 07 movzbl (%r15,%rax,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 37 06 00 00 jne 0x66e 37: 41 8b 2e mov (%r14),%ebp 3a: 89 ee mov %ebp,%esi 3c: 83 e6 02 and $0x2,%esi 3f: 31 .byte 0x31 --- 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 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
