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general protection fault in kernfs_name_hash

Status: closed as invalid on 2022/05/10 19:54
Reported-by: syzbot+dfe5ac05099017d9d483@syzkaller.appspotmail.com
First crash: 948d, last: 948d
Cause bisection: introduced by (bisect log) :
commit bda49ad0602e5250a9d3dd61deda19d3e5615c54
Author: Bart Van Assche <bvanassche@google.com>
Date: Mon Aug 2 17:05:29 2021 +0000

  FROMGIT: loop: Select I/O scheduler 'none' from inside add_disk()

Crash: general protection fault in del_gendisk (log)
Repro: C syz .config
  
▶ ▼ Duplicate bugs (2)
duplicates (2):
Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
general protection fault in kernfs_name_hash (4) C done 2 887d 887d 0/2 closed as dup on 2022/07/11 15:27
general protection fault in kernfs_name_hash (5) C done 3 803d 829d 0/2 closed as dup on 2022/09/14 21:01
▶ ▼ Similar bugs (6)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-5-10 general protection fault in kernfs_name_hash (3) C done 3 891d 891d 0/2 closed as dup on 2022/06/14 17:09
android-5-10 general protection fault in kernfs_name_hash (4) C done 2 887d 887d 0/2 closed as dup on 2022/07/11 15:27
android-54 general protection fault in kernfs_name_hash C 14 653d 865d 0/2 upstream: reported C repro on 2022/07/10 02:13
android-5-10 general protection fault in kernfs_name_hash (2) C done 3 909d 909d 0/2 closed as dup on 2022/05/26 23:28
android-5-10 general protection fault in kernfs_name_hash (5) C done 3 803d 829d 0/2 closed as dup on 2022/09/14 21:01
android-5-10 general protection fault in kernfs_name_hash (6) C error error 22 611d 776d 0/2 auto-obsoleted due to no activity on 2023/07/19 13:32
▶ ▼ Last patch testing requests (8)
Created Duration User Patch Repo Result
2022/05/10 00:28 16m tadeusz.struk@linaro.org patch https://android.googlesource.com/kernel/common android12-5.10 OK
2022/05/09 20:38 15m tadeusz.struk@linaro.org git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master OK
2022/05/06 18:32 10m (58) tadeusz.struk@linaro.org https://android.googlesource.com/kernel/common android12-5.10 report log
2022/05/06 18:26 7m (58) tadeusz.struk@linaro.org https://android.googlesource.com/kernel/common android12-5.10 report log
2022/04/19 14:32 7m tadeusz.struk@linaro.org https://android.googlesource.com/kernel/common android12-5.10 report log
2022/04/19 13:36 8m tadeusz.struk@linaro.org https://android.googlesource.com/kernel/common android12-5.10 report log
2022/04/18 23:23 7m tadeusz.struk@linaro.org https://android.googlesource.com/kernel/common android12-5.10 report log
2022/04/18 22:15 12m tadeusz.struk@linaro.org git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git linux-5.10.y OK

Sample crash report:
RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000005
RBP: 00007ffd7ec02be0 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000004
R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000
---[ end trace e94b7b9cb0473a1e ]---
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: 378 Comm: syz-executor127 Tainted: G        W         5.10.109-syzkaller-00693-g414e6c8e941c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:strlen+0x3a/0x80 lib/string.c:568
Code: c0 ff ff ff ff 49 bf 00 00 00 00 00 fc ff df 48 89 fb 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 49 89 c4 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 75 12 48 ff c3 49 8d 44 24 01 43 80 7c 26 01
RSP: 0018:ffffc90000b87b68 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff8881067ecf00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000b87b88 R08: ffffffff81d12c3c R09: fffff52000170f75
R10: fffff52000170f75 R11: 1ffff92000170f74 R12: ffffffffffffffff
R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
FS:  00005555558dd300(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2317984144 CR3: 0000000106bb1000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 kernfs_name_hash+0x21/0x240 fs/kernfs/dir.c:302
 kernfs_find_ns+0x72/0x280 fs/kernfs/dir.c:841
 kernfs_remove_by_name_ns+0x36/0x90 fs/kernfs/dir.c:1514
 kernfs_remove_by_name include/linux/kernfs.h:608 [inline]
 sysfs_remove_link+0x50/0x60 fs/sysfs/symlink.c:152
 del_gendisk+0xbe0/0xe20 block/genhd.c:951
 loop_remove+0x46/0xb0 drivers/block/loop.c:2185
 loop_control_ioctl+0x67f/0x740 drivers/block/loop.c:2284
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl+0x115/0x190 fs/ioctl.c:739
 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:739
 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f231792c0c9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd7ec02bc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f231792c0c9
RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000005
RBP: 00007ffd7ec02be0 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000004
R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace e94b7b9cb0473a1f ]---
RIP: 0010:strlen+0x3a/0x80 lib/string.c:568
Code: c0 ff ff ff ff 49 bf 00 00 00 00 00 fc ff df 48 89 fb 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 49 89 c4 48 89 d8 48 c1 e8 03 <42> 0f b6 04 38 84 c0 75 12 48 ff c3 49 8d 44 24 01 43 80 7c 26 01
RSP: 0018:ffffc90000b87b68 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff8881067ecf00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000b87b88 R08: ffffffff81d12c3c R09: fffff52000170f75
R10: fffff52000170f75 R11: 1ffff92000170f74 R12: ffffffffffffffff
R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000
FS:  00005555558dd300(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2317984144 CR3: 0000000106bb1000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 5 bytes skipped:
   0:	49 bf 00 00 00 00 00 	movabs $0xdffffc0000000000,%r15
   7:	fc ff df
   a:	48 89 fb             	mov    %rdi,%rbx
   d:	66 66 2e 0f 1f 84 00 	data16 nopw %cs:0x0(%rax,%rax,1)
  14:	00 00 00 00
  18:	0f 1f 00             	nopl   (%rax)
  1b:	49 89 c4             	mov    %rax,%r12
  1e:	48 89 d8             	mov    %rbx,%rax
  21:	48 c1 e8 03          	shr    $0x3,%rax
* 25:	42 0f b6 04 38       	movzbl (%rax,%r15,1),%eax <-- trapping instruction
  2a:	84 c0                	test   %al,%al
  2c:	75 12                	jne    0x40
  2e:	48 ff c3             	inc    %rbx
  31:	49 8d 44 24 01       	lea    0x1(%r12),%rax
  36:	43                   	rex.XB
  37:	80                   	.byte 0x80
  38:	7c 26                	jl     0x60
  3a:	01                   	.byte 0x1

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/04/18 02:03 android12-5.10-lts 414e6c8e941c 8bcc32a6 .config console log report syz C ci2-android-5-10 general protection fault in kernfs_name_hash
2022/04/18 01:42 android12-5.10-lts 414e6c8e941c 8bcc32a6 .config console log report info ci2-android-5-10 general protection fault in kernfs_name_hash
* Struck through repros no longer work on HEAD.