KASAN: user-memory-access Read in jfs_statfs

Status: upstream: reported syz repro on 2024/05/07 07:57
Subsystems: jfs
[Documentation on labels]
First crash: 55d, last: 31d
Cause bisection: introduced by (bisect log) [no-op ignored commit]:
commit 233d3ee4ba3636c0215714ee9f282e08147a452b
Author: Kent Russell <>
Date: Fri Mar 22 13:01:26 2019 +0000

  drm/amdgpu: Allow switching to CUSTOM profile on smu7 v2

Crash: KASAN: use-after-free Read in lbmIODone (log)
Repro: syz .config
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [jfs?] KASAN: user-memory-access Read in jfs_statfs 0 (1) 2024/05/07 07:57
Last patch testing requests (1)
Created Duration User Patch Repo Result
2024/05/21 07:59 18m retest repro upstream report log

Sample crash report:
BUG: KASAN: user-memory-access in instrument_atomic_read include/linux/instrumented.h:68 [inline]
BUG: KASAN: user-memory-access in atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
BUG: KASAN: user-memory-access in jfs_statfs+0x20e/0x510 fs/jfs/super.c:140
Read of size 4 at addr 00000000000050c0 by task syz-executor.1/7188

CPU: 1 PID: 7188 Comm: syz-executor.1 Not tainted 6.9.0-rc7-syzkaller-00012-gdccb07f2914c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 print_report+0xe8/0x550 mm/kasan/report.c:491
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189
 instrument_atomic_read include/linux/instrumented.h:68 [inline]
 atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
 jfs_statfs+0x20e/0x510 fs/jfs/super.c:140
 statfs_by_dentry fs/statfs.c:66 [inline]
 vfs_statfs fs/statfs.c:90 [inline]
 user_statfs+0x216/0x460 fs/statfs.c:105
 __do_sys_statfs fs/statfs.c:195 [inline]
 __se_sys_statfs fs/statfs.c:192 [inline]
 __x64_sys_statfs+0xe8/0x1a0 fs/statfs.c:192
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
RIP: 0033:0x7ff13647dca9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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:00007ff1371a30c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000089
RAX: ffffffffffffffda RBX: 00007ff1365abf80 RCX: 00007ff13647dca9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200000c0
RBP: 00007ff1364c947e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007ff1365abf80 R15: 00007fffc058c158

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/07 07:56 upstream dccb07f2914c fa7a5cf0 .config strace log report syz [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs KASAN: user-memory-access Read in jfs_statfs
2024/05/07 04:21 upstream dccb07f2914c fa7a5cf0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: user-memory-access Read in jfs_statfs
2024/05/02 09:24 upstream 0106679839f7 3ba885bc .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: user-memory-access Read in jfs_statfs
2024/04/27 21:52 upstream 5d12ed4bea43 07b455f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: user-memory-access Read in jfs_statfs
* Struck through repros no longer work on HEAD.