general protection fault in path

Title	Replies (including bot)	Last reply
[syzbot] general protection fault in path_init	0 (1)	2021/09/17 07:46

Title

Replies (including bot)

Last reply

[syzbot] general protection fault in path_init

0 (1)

2021/09/17 07:46

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	general protection fault in path_init (2) fs				1	426d	422d	0/26	auto-obsoleted due to no activity on 2023/05/22 23:32
upstream	KMSAN: uninit-value in path_init				7	679d	680d	0/26	closed as invalid on 2022/06/14 13:16

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