syzbot


KASAN: null-ptr-deref Write in vfs_rmdir

Status: upstream: reported C repro on 2024/04/11 09:39
Bug presence: origin:downstream
[Documentation on labels]
Reported-by: syzbot+4e62caa04a7928cf10c7@syzkaller.appspotmail.com
First crash: 64d, last: 16d
Bug presence (3)
Date Name Commit Repro Result
2024/04/12 android14-6.1 (ToT) 354782156070 C [report] KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/12 lts (merge base) 883d1a956208 C Didn't crash
2024/04/12 upstream (ToT) 586b5dfb51b9 C Didn't crash
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-5-15 KASAN: null-ptr-deref Write in vfs_rmdir origin:downstream C 5 8d00h 64d 0/2 upstream: reported C repro on 2024/04/11 17:58
android-54 KASAN: null-ptr-deref Write in vfs_rmdir C 30 5d08h 65d 0/2 upstream: reported C repro on 2024/04/11 05:33
android-5-10 KASAN: null-ptr-deref Write in vfs_rmdir C 181 1d11h 65d 0/2 upstream: reported C repro on 2024/04/11 05:14
Last patch testing requests (2)
Created Duration User Patch Repo Result
2024/05/29 09:28 14m retest repro android14-6.1 report log
2024/05/29 09:28 10m retest repro android14-6.1 report log

Sample crash report:
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001
RBP: 00007f5330901350 R08: ffffffffffffffb8 R09: 0000000000000000
R10: 0000000000001000 R11: 0000000000000246 R12: 00007f5330901350
R13: 0000000000000000 R14: 00007f5330901da0 R15: 00007f53308568f0
 </TASK>
---[ end trace 0000000000000000 ]---
==================================================================
BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:102 [inline]
BUG: KASAN: null-ptr-deref in atomic_inc_return include/linux/atomic/atomic-instrumented.h:198 [inline]
BUG: KASAN: null-ptr-deref in ihold+0x20/0x60 fs/inode.c:452
Write of size 4 at addr 0000000000000170 by task syz-executor891/296

CPU: 0 PID: 296 Comm: syz-executor891 Tainted: G        W          6.1.75-syzkaller-00017-gca4095789fda #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106
 print_report+0xe1/0x4e0 mm/kasan/report.c:430
 kasan_report+0x13c/0x170 mm/kasan/report.c:531
 kasan_check_range+0x294/0x2a0 mm/kasan/generic.c:189
 __kasan_check_write+0x14/0x20 mm/kasan/shadow.c:37
 instrument_atomic_read_write include/linux/instrumented.h:102 [inline]
 atomic_inc_return include/linux/atomic/atomic-instrumented.h:198 [inline]
 ihold+0x20/0x60 fs/inode.c:452
 d_delete_notify include/linux/fsnotify.h:281 [inline]
 vfs_rmdir+0x268/0x500 fs/namei.c:4211
 incfs_kill_sb+0x113/0x230 fs/incfs/vfs.c:1962
 deactivate_locked_super+0xad/0x110 fs/super.c:334
 deactivate_super+0xbe/0xf0 fs/super.c:365
 cleanup_mnt+0x485/0x510 fs/namespace.c:1186
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1193
 task_work_run+0x24d/0x2e0 kernel/task_work.c:179
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0xbd5/0x2b80 kernel/exit.c:875
 do_group_exit+0x21a/0x2d0 kernel/exit.c:1025
 __do_sys_exit_group kernel/exit.c:1036 [inline]
 __se_sys_exit_group kernel/exit.c:1034 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1034
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f5330885909
Code: Unable to access opcode bytes at 0x7f53308858df.
RSP: 002b:00007ffcad9b8f88 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f5330885909
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001
RBP: 00007f5330901350 R08: ffffffffffffffb8 R09: 0000000000000000
R10: 0000000000001000 R11: 0000000000000246 R12: 00007f5330901350
R13: 0000000000000000 R14: 00007f5330901da0 R15: 00007f53308568f0
 </TASK>
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000170
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 0 P4D 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 296 Comm: syz-executor891 Tainted: G    B   W          6.1.75-syzkaller-00017-gca4095789fda #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:arch_atomic_inc_return include/linux/atomic/atomic-arch-fallback.h:440 [inline]
RIP: 0010:atomic_inc_return include/linux/atomic/atomic-instrumented.h:199 [inline]
RIP: 0010:ihold+0x25/0x60 fs/inode.c:452
Code: 00 00 00 00 00 55 48 89 e5 41 56 53 49 89 fe e8 f1 47 a9 ff 49 8d be 70 01 00 00 be 04 00 00 00 e8 b0 2a f0 ff bb 01 00 00 00 <f0> 41 0f c1 9e 70 01 00 00 ff c3 bf 02 00 00 00 89 de e8 74 4b a9
RSP: 0018:ffffc90000dc7ab0 EFLAGS: 00010246
RAX: ffff88811b89a800 RBX: 0000000000000001 RCX: ffff88811b89a880
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000dc7ac0 R08: ffffffff814470c3 R09: fffffbfff0ee5efd
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff1102335af2b
R13: ffff88811f931bb0 R14: 0000000000000000 R15: 1ffff11023f2637c
FS:  0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000170 CR3: 000000010f3e1000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 d_delete_notify include/linux/fsnotify.h:281 [inline]
 vfs_rmdir+0x268/0x500 fs/namei.c:4211
 incfs_kill_sb+0x113/0x230 fs/incfs/vfs.c:1962
 deactivate_locked_super+0xad/0x110 fs/super.c:334
 deactivate_super+0xbe/0xf0 fs/super.c:365
 cleanup_mnt+0x485/0x510 fs/namespace.c:1186
 __cleanup_mnt+0x19/0x20 fs/namespace.c:1193
 task_work_run+0x24d/0x2e0 kernel/task_work.c:179
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0xbd5/0x2b80 kernel/exit.c:875
 do_group_exit+0x21a/0x2d0 kernel/exit.c:1025
 __do_sys_exit_group kernel/exit.c:1036 [inline]
 __se_sys_exit_group kernel/exit.c:1034 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1034
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f5330885909
Code: Unable to access opcode bytes at 0x7f53308858df.
RSP: 002b:00007ffcad9b8f88 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f5330885909
RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001
RBP: 00007f5330901350 R08: ffffffffffffffb8 R09: 0000000000000000
R10: 0000000000001000 R11: 0000000000000246 R12: 00007f5330901350
R13: 0000000000000000 R14: 00007f5330901da0 R15: 00007f53308568f0
 </TASK>
Modules linked in:
CR2: 0000000000000170
---[ end trace 0000000000000000 ]---
RIP: 0010:arch_atomic_inc_return include/linux/atomic/atomic-arch-fallback.h:440 [inline]
RIP: 0010:atomic_inc_return include/linux/atomic/atomic-instrumented.h:199 [inline]
RIP: 0010:ihold+0x25/0x60 fs/inode.c:452
Code: 00 00 00 00 00 55 48 89 e5 41 56 53 49 89 fe e8 f1 47 a9 ff 49 8d be 70 01 00 00 be 04 00 00 00 e8 b0 2a f0 ff bb 01 00 00 00 <f0> 41 0f c1 9e 70 01 00 00 ff c3 bf 02 00 00 00 89 de e8 74 4b a9
RSP: 0018:ffffc90000dc7ab0 EFLAGS: 00010246
RAX: ffff88811b89a800 RBX: 0000000000000001 RCX: ffff88811b89a880
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000dc7ac0 R08: ffffffff814470c3 R09: fffffbfff0ee5efd
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff1102335af2b
R13: ffff88811f931bb0 R14: 0000000000000000 R15: 1ffff11023f2637c
FS:  0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000170 CR3: 000000010f3e1000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	00 00                	add    %al,(%rax)
   4:	00 55 48             	add    %dl,0x48(%rbp)
   7:	89 e5                	mov    %esp,%ebp
   9:	41 56                	push   %r14
   b:	53                   	push   %rbx
   c:	49 89 fe             	mov    %rdi,%r14
   f:	e8 f1 47 a9 ff       	call   0xffa94805
  14:	49 8d be 70 01 00 00 	lea    0x170(%r14),%rdi
  1b:	be 04 00 00 00       	mov    $0x4,%esi
  20:	e8 b0 2a f0 ff       	call   0xfff02ad5
  25:	bb 01 00 00 00       	mov    $0x1,%ebx
* 2a:	f0 41 0f c1 9e 70 01 	lock xadd %ebx,0x170(%r14) <-- trapping instruction
  31:	00 00
  33:	ff c3                	inc    %ebx
  35:	bf 02 00 00 00       	mov    $0x2,%edi
  3a:	89 de                	mov    %ebx,%esi
  3c:	e8                   	.byte 0xe8
  3d:	74 4b                	je     0x8a
  3f:	a9                   	.byte 0xa9

Crashes (50):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/04/12 00:47 android14-6.1 ca4095789fda 95ed9ece .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/11 10:32 android14-6.1 be55946e207c 33b9e058 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/11 09:34 android14-6.1 be55946e207c 33b9e058 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/05/15 08:28 android14-6.1 039d2a958c13 fdb4c10c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/05/12 04:55 android14-6.1 4d55129aea65 9026e142 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/05/08 10:36 android14-6.1 d5e04556d434 4cf3f9b3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/05/06 05:24 android14-6.1 1794308d463f 610f2a54 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/05/06 05:24 android14-6.1 1794308d463f 610f2a54 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/05/05 06:02 android14-6.1 1794308d463f 610f2a54 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/29 15:17 android14-6.1 08cc4037cf32 27e33c58 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/29 15:17 android14-6.1 08cc4037cf32 27e33c58 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/28 09:13 android14-6.1 fa87a072a7fc 07b455f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/28 05:37 android14-6.1 fa87a072a7fc 07b455f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/28 05:36 android14-6.1 fa87a072a7fc 07b455f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/28 05:36 android14-6.1 fa87a072a7fc 07b455f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/28 05:36 android14-6.1 fa87a072a7fc 07b455f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/27 11:39 android14-6.1 fa87a072a7fc 07b455f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/27 06:36 android14-6.1 fa87a072a7fc 07b455f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/27 06:34 android14-6.1 fa87a072a7fc 07b455f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/27 06:34 android14-6.1 fa87a072a7fc 07b455f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/27 06:34 android14-6.1 fa87a072a7fc 07b455f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/24 19:19 android14-6.1 d0c6724b0f6f 8bdc0f22 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/24 19:18 android14-6.1 d0c6724b0f6f 8bdc0f22 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/24 19:18 android14-6.1 d0c6724b0f6f 8bdc0f22 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/24 19:18 android14-6.1 d0c6724b0f6f 8bdc0f22 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/24 19:17 android14-6.1 d0c6724b0f6f 8bdc0f22 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/24 19:17 android14-6.1 d0c6724b0f6f 8bdc0f22 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/24 19:17 android14-6.1 d0c6724b0f6f 8bdc0f22 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/24 19:17 android14-6.1 d0c6724b0f6f 8bdc0f22 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/24 19:17 android14-6.1 d0c6724b0f6f 8bdc0f22 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/24 15:31 android14-6.1 d0c6724b0f6f 21339d7b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/24 08:57 android14-6.1 d0c6724b0f6f 21339d7b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/20 18:50 android14-6.1 dcb09569bbff af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/18 17:46 android14-6.1 692e3553d2e9 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/18 17:46 android14-6.1 692e3553d2e9 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/18 17:46 android14-6.1 692e3553d2e9 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/17 19:22 android14-6.1 141ebdcb283b acc528cb .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/17 09:26 android14-6.1 089d1b8f6daf 18f6e127 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/17 07:29 android14-6.1 089d1b8f6daf 18f6e127 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/15 03:49 android14-6.1 b76ed1185975 c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/14 02:52 android14-6.1 cfa154389a65 c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/13 21:05 android14-6.1 cfa154389a65 c8349e48 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/12 10:15 android14-6.1 354782156070 27de0a5c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
2024/04/11 09:06 android14-6.1 be55946e207c 33b9e058 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 KASAN: null-ptr-deref Write in vfs_rmdir
* Struck through repros no longer work on HEAD.