syzbot


general protection fault in fuse_atomic_open

Status: upstream: reported C repro on 2023/07/16 23:36
Reported-by: syzbot+8e06855e2fa000e0c107@syzkaller.appspotmail.com
First crash: 221d, last: 24d
Cause bisection: failed (error log, bisect log)
  
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-6-1 general protection fault in fuse_atomic_open origin:downstream C done 2 11d 221d 0/2 upstream: reported C repro on 2023/07/17 00:03
android-5-15 general protection fault in fuse_atomic_open (2) origin:downstream C done 6 39d 208d 0/2 upstream: reported C repro on 2023/07/29 15:55
android-5-15 general protection fault in fuse_atomic_open 1 326d 326d 0/2 auto-obsoleted due to no activity on 2023/07/01 15:58
Last patch testing requests (4)
Created Duration User Patch Repo Result
2024/01/30 06:50 4m retest repro android13-5.10-lts report log
2024/01/13 14:59 7m retest repro android13-5.10-lts report log
2023/11/21 06:16 10m retest repro android13-5.10-lts report log
2023/08/25 02:14 14m retest repro android13-5.10-lts report log
Fix bisection attempts (2)
Created Duration User Patch Repo Result
2023/10/26 04:01 44m bisect fix android13-5.10-lts job log (0) log
2023/09/26 01:12 33m bisect fix android13-5.10-lts job log (0) log

Sample crash report:
general protection fault, probably for non-canonical address 0xdffffc0000000009: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000048-0x000000000000004f]
CPU: 0 PID: 291 Comm: syz-executor172 Not tainted 5.10.199-syzkaller-00307-gd30b996835c0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
RIP: 0010:d_really_is_positive include/linux/dcache.h:499 [inline]
RIP: 0010:fuse_atomic_open+0x27f/0x34e0 fs/fuse/dir.c:849
Code: e0 40 4c 8b 64 24 20 75 07 e8 dd c7 6c ff eb 37 48 8b 44 24 60 48 8d 58 30 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 73 38 aa ff 48 83 3b 00 0f 84 a9 00
RSP: 0018:ffffc90000b57300 EFLAGS: 00010206
RAX: 0000000000000009 RBX: 0000000000000048 RCX: dffffc0000000000
RDX: ffff88811eb20000 RSI: 0000000000000040 RDI: 0000000000000000
RBP: ffffc90000b57930 R08: ffffffff81fddba2 R09: 0000000000000003
R10: fffff5200016ace8 R11: dffffc0000000001 R12: ffff88811c8f8928
R13: ffff88811ea58800 R14: 1ffff9200016ae78 R15: 0000000000000018
FS:  00007f9be6ad26c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9be6ad2d58 CR3: 00000001184f2000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 atomic_open fs/namei.c:3120 [inline]
 lookup_open fs/namei.c:3225 [inline]
 open_last_lookups fs/namei.c:3323 [inline]
 path_openat+0xff0/0x3000 fs/namei.c:3512
 do_filp_open+0x21c/0x460 fs/namei.c:3542
 do_sys_openat2+0x13f/0x6f0 fs/open.c:1217
 do_sys_open fs/open.c:1233 [inline]
 __do_sys_creat fs/open.c:1307 [inline]
 __se_sys_creat fs/open.c:1301 [inline]
 __x64_sys_creat+0x11f/0x160 fs/open.c:1301
 do_syscall_64+0x34/0x70
 entry_SYSCALL_64_after_hwframe+0x61/0xc6
RIP: 0033:0x7f9be6b31639
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 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:00007f9be6ad2218 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f9be6bbe3f8 RCX: 00007f9be6b31639
RDX: 00007f9be6b31639 RSI: 0000000000000000 RDI: 0000000020000100
RBP: 00007f9be6bbe3f0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9be6b8b024
R13: 000000000000006e R14: 0030656c69662f30 R15: 2f30656c69662f2e
Modules linked in:
---[ end trace 43dd884af1d563ad ]---
RIP: 0010:d_really_is_positive include/linux/dcache.h:499 [inline]
RIP: 0010:fuse_atomic_open+0x27f/0x34e0 fs/fuse/dir.c:849
Code: e0 40 4c 8b 64 24 20 75 07 e8 dd c7 6c ff eb 37 48 8b 44 24 60 48 8d 58 30 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 73 38 aa ff 48 83 3b 00 0f 84 a9 00
RSP: 0018:ffffc90000b57300 EFLAGS: 00010206
RAX: 0000000000000009 RBX: 0000000000000048 RCX: dffffc0000000000
RDX: ffff88811eb20000 RSI: 0000000000000040 RDI: 0000000000000000
RBP: ffffc90000b57930 R08: ffffffff81fddba2 R09: 0000000000000003
R10: fffff5200016ace8 R11: dffffc0000000001 R12: ffff88811c8f8928
R13: ffff88811ea58800 R14: 1ffff9200016ae78 R15: 0000000000000018
FS:  00007f9be6ad26c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000061ba0c CR3: 00000001184f2000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	e0 40                	loopne 0x42
   2:	4c 8b 64 24 20       	mov    0x20(%rsp),%r12
   7:	75 07                	jne    0x10
   9:	e8 dd c7 6c ff       	call   0xff6cc7eb
   e:	eb 37                	jmp    0x47
  10:	48 8b 44 24 60       	mov    0x60(%rsp),%rax
  15:	48 8d 58 30          	lea    0x30(%rax),%rbx
  19:	48 89 d8             	mov    %rbx,%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:	48 89 df             	mov    %rbx,%rdi
  33:	e8 73 38 aa ff       	call   0xffaa38ab
  38:	48 83 3b 00          	cmpq   $0x0,(%rbx)
  3c:	0f                   	.byte 0xf
  3d:	84                   	.byte 0x84
  3e:	a9                   	.byte 0xa9

Crashes (7):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/11/07 06:04 android13-5.10-lts d30b996835c0 83211397 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in fuse_atomic_open
2023/07/16 23:27 android13-5.10-lts 59b65efafe20 35d9ecc5 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in fuse_atomic_open
2023/12/30 13:23 android13-5.10-lts f7977422e132 fb427a07 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in fuse_atomic_open
2023/12/06 12:19 android13-5.10-lts 02a4d4a11d37 858d62d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in fuse_atomic_open
2023/11/07 05:39 android13-5.10-lts d30b996835c0 83211397 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in fuse_atomic_open
2023/08/11 00:03 android13-5.10-lts 8a427269c016 da3c3ef8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in fuse_atomic_open
2023/07/16 23:08 android13-5.10-lts 59b65efafe20 35d9ecc5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in fuse_atomic_open
* Struck through repros no longer work on HEAD.