Hello, syzbot found the following issue on: HEAD commit: 49624efa65ac Merge tag 'denywrite-for-5.15' of git://githu.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1289787d300000 kernel config: https://syzkaller.appspot.com/x/.config?x=172cce3513a61f40 dashboard link: https://syzkaller.appspot.com/bug?extid=ae0fa0f86eb10f87db2d compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ae0fa0f86eb10f87db2d@xxxxxxxxxxxxxxxxxxxxxxxxx general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 PID: 12334 Comm: iou-wrk-12330 Not tainted 5.14.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:path_init+0x8d/0x1920 fs/namei.c:2321 Code: 48 c1 ea 03 80 3c 02 00 0f 85 e7 15 00 00 48 8b 45 c8 48 8b 98 c0 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 b4 15 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b RSP: 0018:ffffc900019b77c0 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff81cac27f RDI: ffffc900019b7998 RBP: ffffc900019b7860 R08: 0000000000200000 R09: ffffc900019b7a98 R10: ffffffff81cac266 R11: 0000000000000024 R12: 0000000000000040 R13: ffffc900019b78d8 R14: ffffc900019b78d8 R15: ffffc900019b78d8 FS: 00007f8de3d0b700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8de3cea718 CR3: 000000008b11c000 CR4: 00000000001526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: path_parentat+0x22/0x1c0 fs/namei.c:2504 __filename_parentat+0x1bb/0x5a0 fs/namei.c:2527 do_unlinkat+0xc4/0x650 fs/namei.c:4140 io_unlinkat fs/io_uring.c:3703 [inline] io_issue_sqe+0x46c9/0x6ba0 fs/io_uring.c:6650 io_wq_submit_work+0x1d4/0x300 fs/io_uring.c:6707 io_worker_handle_work+0xcb1/0x1950 fs/io-wq.c:560 io_wqe_worker+0x2cc/0xbb0 fs/io-wq.c:609 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Modules linked in: ---[ end trace 55738b1526c3e749 ]--- RIP: 0010:path_init+0x8d/0x1920 fs/namei.c:2321 Code: 48 c1 ea 03 80 3c 02 00 0f 85 e7 15 00 00 48 8b 45 c8 48 8b 98 c0 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 b4 15 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b RSP: 0018:ffffc900019b77c0 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff81cac27f RDI: ffffc900019b7998 RBP: ffffc900019b7860 R08: 0000000000200000 R09: ffffc900019b7a98 R10: ffffffff81cac266 R11: 0000000000000024 R12: 0000000000000040 R13: ffffc900019b78d8 R14: ffffc900019b78d8 R15: ffffc900019b78d8 FS: 00007f8de3d0b700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc0711ca108 CR3: 000000008b11c000 CR4: 00000000001526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 ---------------- Code disassembly (best guess): 0: 48 c1 ea 03 shr $0x3,%rdx 4: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 8: 0f 85 e7 15 00 00 jne 0x15f5 e: 48 8b 45 c8 mov -0x38(%rbp),%rax 12: 48 8b 98 c0 00 00 00 mov 0xc0(%rax),%rbx 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 23: 48 89 da mov %rbx,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 b4 15 00 00 jne 0x15e8 34: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 3b: fc ff df 3e: 48 rex.W 3f: 8b .byte 0x8b --- 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.
