syzbot


general protection fault in fuse_file_put

Status: upstream: reported C repro on 2023/09/13 14:58
Bug presence: origin:downstream
[Documentation on labels]
Reported-by: syzbot+06653aa43e21cf262ef9@syzkaller.appspotmail.com
First crash: 211d, last: 16d
Bug presence (3)
Date Name Commit Repro Result
2023/09/13 android13-5.15-lts (ToT) ea586874d2f9 C [report] general protection fault in fuse_file_put
2023/09/13 lts (merge base) aff03380bda4 C Didn't crash
2023/09/13 upstream (ToT) 3669558bdf35 C Didn't crash
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-6-1 general protection fault in fuse_file_put origin:downstream C done 6 13d 284d 0/2 upstream: reported C repro on 2023/07/02 13:38
android-5-10 general protection fault in fuse_file_put C 9 23d 242d 0/2 upstream: reported C repro on 2023/08/14 01:55
Fix bisection attempts (6)
Created Duration User Patch Repo Result
2024/03/27 08:53 1h12m bisect fix android13-5.15-lts job log (0) log
2024/02/26 05:26 40m bisect fix android13-5.15-lts job log (0) log
2024/01/18 22:36 47m bisect fix android13-5.15-lts job log (0) log
2023/12/18 10:24 37m bisect fix android13-5.15-lts job log (0) log
2023/11/18 06:23 44m bisect fix android13-5.15-lts job log (0) log
2023/10/18 00:49 38m bisect fix android13-5.15-lts job log (0) log

Sample crash report:
RBP: 00007fd75c3fc400 R08: 00007fd75c2ebfa6 R09: 0000000000003331
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd75c3c922c
R13: 00007fd75c2ec210 R14: 0000000000000002 R15: 2f30656c69662f2e
 </TASK>
general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
CPU: 1 PID: 313 Comm: syz-executor332 Not tainted 5.15.131-syzkaller-00653-gea586874d2f9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
RIP: 0010:get_fuse_mount fs/fuse/fuse_i.h:950 [inline]
RIP: 0010:fuse_file_put+0x11d/0x2420 fs/fuse/file.c:119
Code: 01 00 00 00 89 de e8 e2 5b 66 ff 83 fb 01 0f 85 ee 00 00 00 4d 8d 6c 24 28 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ef e8 a5 43 a8 ff 4c 8d bc 24 c0 00 00 00
RSP: 0018:ffffc90000956ea0 EFLAGS: 00010206
RAX: 0000000000000005 RBX: 0000000000000001 RCX: dffffc0000000000
RDX: ffff88811dd42780 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffc90000957240 R08: ffffffff82099d4e R09: ffffed1023571e46
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: 0000000000000028 R14: ffff88811ab8f200 R15: ffff88811ab8f228
FS:  00007fd75c2ec6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd75c3c4638 CR3: 000000011db85000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 fuse_sync_release+0x81/0xb0 fs/fuse/file.c:399
 fuse_create_open fs/fuse/dir.c:817 [inline]
 fuse_atomic_open+0x2a5c/0x3750 fs/fuse/dir.c:879
 atomic_open fs/namei.c:3255 [inline]
 lookup_open fs/namei.c:3363 [inline]
 open_last_lookups fs/namei.c:3462 [inline]
 path_openat+0xfde/0x2f40 fs/namei.c:3669
 do_filp_open+0x21c/0x460 fs/namei.c:3699
 do_sys_openat2+0x13f/0x830 fs/open.c:1234
 do_sys_open fs/open.c:1250 [inline]
 __do_sys_openat fs/open.c:1266 [inline]
 __se_sys_openat fs/open.c:1261 [inline]
 __x64_sys_openat+0x243/0x290 fs/open.c:1261
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fd75c36dfa9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 18 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd75c2ec208 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fd75c3fc408 RCX: 00007fd75c36dfa9
RDX: 0000000000000c41 RSI: 0000000020002000 RDI: ffffffffffffff9c
RBP: 00007fd75c3fc400 R08: 00007fd75c2ebfa6 R09: 0000000000003331
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd75c3c922c
R13: 00007fd75c2ec210 R14: 0000000000000002 R15: 2f30656c69662f2e
 </TASK>
Modules linked in:
---[ end trace 397894a245fe9706 ]---
RIP: 0010:get_fuse_mount fs/fuse/fuse_i.h:950 [inline]
RIP: 0010:fuse_file_put+0x11d/0x2420 fs/fuse/file.c:119
Code: 01 00 00 00 89 de e8 e2 5b 66 ff 83 fb 01 0f 85 ee 00 00 00 4d 8d 6c 24 28 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ef e8 a5 43 a8 ff 4c 8d bc 24 c0 00 00 00
RSP: 0018:ffffc90000956ea0 EFLAGS: 00010206
RAX: 0000000000000005 RBX: 0000000000000001 RCX: dffffc0000000000
RDX: ffff88811dd42780 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffc90000957240 R08: ffffffff82099d4e R09: ffffed1023571e46
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: 0000000000000028 R14: ffff88811ab8f200 R15: ffff88811ab8f228
FS:  00007fd75c2ec6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd75c3c4638 CR3: 000000011db85000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	01 00                	add    %eax,(%rax)
   2:	00 00                	add    %al,(%rax)
   4:	89 de                	mov    %ebx,%esi
   6:	e8 e2 5b 66 ff       	call   0xff665bed
   b:	83 fb 01             	cmp    $0x1,%ebx
   e:	0f 85 ee 00 00 00    	jne    0x102
  14:	4d 8d 6c 24 28       	lea    0x28(%r12),%r13
  19:	4c 89 e8             	mov    %r13,%rax
  1c:	48 c1 e8 03          	shr    $0x3,%rax
  20:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  27:	fc ff df
* 2a:	80 3c 08 00          	cmpb   $0x0,(%rax,%rcx,1) <-- trapping instruction
  2e:	74 08                	je     0x38
  30:	4c 89 ef             	mov    %r13,%rdi
  33:	e8 a5 43 a8 ff       	call   0xffa843dd
  38:	4c 8d bc 24 c0 00 00 	lea    0xc0(%rsp),%r15
  3f:	00

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/09/13 14:57 android13-5.15-lts ea586874d2f9 0b6a67ac .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in fuse_file_put
* Struck through repros no longer work on HEAD.