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KASAN: user-memory-access Read in jfs_statfs

Status: upstream: reported C repro on 2024/05/07 07:57
Subsystems: jfs
[Documentation on labels]
Reported-by: syzbot+cea4fad5485bc30243a9@syzkaller.appspotmail.com
First crash: 757d, last: 22d
Cause bisection: introduced by (bisect log) [no-op ignored commit]:
commit 233d3ee4ba3636c0215714ee9f282e08147a452b
Author: Kent Russell <kent.russell@amd.com>
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
  
Fix bisection: failed (error log, bisect log)
  
▶ ▼ ✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision Error
dae0239e-40d5-46ae-a6e9-339d490d0f5f assessment-security 💥 KASAN: user-memory-access Read in jfs_statfs 2026/05/25 09:22 2026/05/25 09:22 2026/05/25 09:45 c69befb30ac10e158cc9d1557b508ee3f0eca1de failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/04190e8715b6c826453d35714fe42ab1249d99f1" "-s" "bzImage" "compile_commands.json"]: exit status 2 Root cause: ld.lld: error: undefined symbol: wcslen * * Restart config... * * * General architecture-dependent options * Kprobes (KPROBES) [N/y/?] n Optimize very unlikely/likely branches (JUMP_LABEL) [Y/n/?] y Static key selftest (STATIC_KEYS_SELFTEST) [N/y/?] n Static call selftest (STATIC_CALL_SELFTEST) [N/y/?] n Enable seccomp to safely execute untrusted bytecode (SECCOMP) [Y/n/?] y Show seccomp filter cache status in /proc/pid/seccomp_cache (SECCOMP_CACHE_DEBUG) [N/y/?] n Link Time Optimization (LTO) > 1. None (LTO_NONE) choice[1]: 1 Use Clang's Control Flow Integrity (CFI) (CFI_CLANG) [N/y/?] (NEW) Error in reading or end of file. Number of bits to use for ASLR of mmap base address (ARCH_MMAP_RND_BITS) [28] 28 Number of bits to use for ASLR of mmap base address for compatible applications (ARCH_MMAP_RND_COMPAT_BITS) [8] 8 MMU page size > 1. 4KiB pages (PAGE_SIZE_4KB) choice[1]: 1 Provide system calls for 32-bit time_t (COMPAT_32BIT_TIME) [Y/n/?] y Use a virtually-mapped stack (VMAP_STACK) [Y/n/?] y Support for randomizing kernel stack offset on syscall entry (RANDOMIZE_KSTACK_OFFSET) [Y/n/?] y Default state of kernel stack offset randomization (RANDOMIZE_KSTACK_OFFSET_DEFAULT) [N/y/?] n Locking event counts collection (LOCK_EVENT_COUNTS) [N/y/?] n * * Memory initialization * Initialize kernel stack variables at function entry 1. no automatic stack variable initialization (weakest) (INIT_STACK_NONE) 2. pattern-init everything (strongest) (INIT_STACK_ALL_PATTERN) > 3. zero-init everything (strongest and safest) (INIT_STACK_ALL_ZERO) choice[1-3?]: 3 Enable heap memory zeroing on allocation by default (INIT_ON_ALLOC_DEFAULT_ON) [Y/n/?] y Enable heap memory zeroing on free by default (INIT_ON_FREE_DEFAULT_ON) [N/y/?] n Enable register zeroing on function exit (ZERO_CALL_USED_REGS) [N/y/?] (NEW) Error in reading or end of file. * * Kernel hardening options * Randomize layout of sensitive kernel structures > 1. Disable structure layout randomization (RANDSTRUCT_NONE) 2. Fully randomize structure layout (RANDSTRUCT_FULL) (NEW) choice[1-2?]: Error in reading or end of file. * * Compile-time checks and compiler options * Debug information 1. Disable debug information (DEBUG_INFO_NONE) 2. Rely on the toolchain's implicit default DWARF version (DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT) > 3. Generate DWARF Version 4 debuginfo (DEBUG_INFO_DWARF4) 4. Generate DWARF Version 5 debuginfo (DEBUG_INFO_DWARF5) choice[1-4?]: 3 Reduce debugging information (DEBUG_INFO_REDUCED) [N/y/?] n Compressed Debug information > 1. Don't compress debug information (DEBUG_INFO_COMPRESSED_NONE) 2. Compress debugging information with zlib (DEBUG_INFO_COMPRESSED_ZLIB) 3. Compress debugging information with zstd (DEBUG_INFO_COMPRESSED_ZSTD) (NEW) choice[1-3?]: Error in reading or end of file. Produce split debuginfo in .dwo files (DEBUG_INFO_SPLIT) [N/y/?] n Generate BTF type information (DEBUG_INFO_BTF) [N/y/?] n Provide GDB scripts for kernel debugging (GDB_SCRIPTS) [N/y/?] n Warn for stack frames larger than (FRAME_WARN) [2048] 2048 Strip assembler-generated symbols during link (STRIP_ASM_SYMS) [N/y/?] n Install uapi headers to usr/include (HEADERS_INSTALL) [N/y/?] n Make section mismatch errors non-fatal (SECTION_MISMATCH_WARN_ONLY) [Y/n/?] y Force all function address 64B aligned (DEBUG_FORCE_FUNCTION_ALIGN_64B) [N/y/?] n Generate vmlinux.map file when linking (VMLINUX_MAP) [N/y/?] n Force weak per-cpu definitions (DEBUG_FORCE_WEAK_PER_CPU) [N/y/?] n In file included from /app/workdir/cache/src/4460b0cc5b1e6115f1e2a6a551dfd013a0f3e792/net/socket.c:108: In file included from /app/workdir/cache/src/4460b0cc5b1e6115f1e2a6a551dfd013a0f3e792/include/net/busy_poll.h:18: /app/workdir/cache/src/4460b0cc5b1e6115f1e2a6a551dfd013a0f3e792/include/net/ip.h:472:14: w
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [jfs?] KASAN: user-memory-access Read in jfs_statfs 0 (2) 2024/07/23 22:40
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 KASAN: user-memory-access Read in jfs_statfs origin:upstream 17 syz error 1 133d 133d 0/3 upstream: reported syz repro on 2026/01/12 17:59
▶ ▼ Last patch testing requests (10)
Created Duration User Patch Repo Result
2026/04/20 13:27 19m retest repro upstream report log
2026/04/02 18:45 2h00m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci error
2026/04/02 18:14 2h16m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci error
2026/03/12 14:58 14m retest repro upstream report log
2026/02/09 03:09 19m retest repro upstream report log
2026/01/22 11:28 3h16m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci error
2026/01/22 11:51 2h53m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci error
2025/12/24 06:21 14m retest repro upstream report log
2025/11/30 21:40 13m retest repro upstream report log
2025/11/13 10:00 49m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci report log
▶ ▼ Fix bisection attempts (2)
Created Duration User Patch Repo Result
2024/10/15 01:45 0m bisect fix upstream error job log
2024/09/10 06:17 1h48m bisect fix upstream OK (0) job log 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-executor415/5092

CPU: 1 UID: 0 PID: 5092 Comm: syz-executor415 Not tainted 6.10.0-syzkaller-12084-g28bbe4ea686a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:93 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
 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+0x213/0x460 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+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa111cece59
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 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:00007fa111c82218 EFLAGS: 00000246 ORIG_RAX: 0000000000000089
RAX: ffffffffffffffda RBX: 00007fa111d7b718 RCX: 00007fa111cece59
RDX: 00007fa111cece59 RSI: 0000000000000000 RDI: 00000000200003c0
RBP: 00007fa111d7b710 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa111d4829c
R13: 0032656c69662f2e R14: a92483129444e42d R15: 00007ffecd531438
 </TASK>
==================================================================

Crashes (14):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/07/23 22:39 upstream 28bbe4ea686a e50e8da5 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-upstream-fs KASAN: user-memory-access Read in jfs_statfs
2025/03/19 17:51 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci b5737d35364f 8d0a2921 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-upstream-gce-arm64 KASAN: user-memory-access Read in jfs_statfs
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
2026/05/03 16:25 upstream 66edb901bf87 a0d91488 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: user-memory-access Read in jfs_statfs
2026/02/26 10:45 upstream d9d32e5bd5a4 e0f78d93 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: user-memory-access Read in jfs_statfs
2025/10/30 09:08 upstream e53642b87a4f fd2207e7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: user-memory-access Read in jfs_statfs
2025/06/23 19:40 upstream 86731a2a651e d6cdfb8a .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: user-memory-access Read in jfs_statfs
2025/05/11 01:18 upstream bec6f00f120e 77908e5f .config console log report info [disk image] [vmlinux] [kernel image] 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
2025/11/16 06:34 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci db9030a787e3 f7988ea4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 KASAN: user-memory-access Read in jfs_statfs
2024/07/23 21:06 upstream 28bbe4ea686a e50e8da5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs general protection fault in jfs_statfs
2024/06/26 11:10 upstream 55027e689933 c6d33a01 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs general protection fault in jfs_statfs
* Struck through repros no longer work on HEAD.