KASAN: user-memory-access Read in dqput

Status: upstream: reported C repro on 2025/02/24 07:19
Subsystems: jfs
[Documentation on labels]
Reported-by: syzbot+49423de13afd058db22f@syzkaller.appspotmail.com
First crash: 533d, last: 120d
Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: KASAN: user-memory-access Read in dqput (log)
Repro: C syz .config
  
Fix bisection: failed (error log, bisect log)
  
▶ ▼ ✨ AI Jobs (7)
ID Workflow Result Correct Bug Created Started Finished Revision
008d36c7 assessment-security 💥 KASAN: user-memory-access Read in dqput 2026/08/09 22:49 2026/08/09 22:49 2026/08/09 23:06 5d63f80b
d5c83e99 assessment-security 💥 KASAN: user-memory-access Read in dqput 2026/07/09 01:49 2026/07/09 01:49 2026/07/09 02:19 93f57954
1a5d5d2e assessment-security 💥 KASAN: user-memory-access Read in dqput 2026/06/22 03:45 2026/06/22 03:45 2026/06/22 04:11 43bfcdb0
31a7383b assessment-security 💥 KASAN: user-memory-access Read in dqput 2026/06/14 02:54 2026/06/14 02:54 2026/06/14 03:24 4f06757f
7e7f989b assessment-security 💥 KASAN: user-memory-access Read in dqput 2026/06/09 18:43 2026/06/09 18:43 2026/06/09 19:12 c36c07f6
a1fd0c3b assessment-security 💥 KASAN: user-memory-access Read in dqput 2026/06/02 17:27 2026/06/02 17:27 2026/06/02 17:53 62fe1528
1dc394b4 assessment-security 💥 KASAN: user-memory-access Read in dqput 2026/05/26 04:43 2026/05/26 04:43 2026/05/26 05:17 c69befb3
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [jfs?] KASAN: user-memory-access Read in dqput 0 (1) 2025/02/24 07:19
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 BUG: unable to handle kernel paging request in dqput (2) 8 syz, C error 5 1337d 1429d 0/1 upstream: reported C repro on 2022/09/11 16:38
▶ ▼ Last patch testing requests (6)
Created Duration User Patch Repo Result
2026/07/06 10:27 32m retest repro upstream OK log
2026/04/27 06:11 21m retest repro upstream error
2026/04/13 05:23 13m retest repro upstream report log
2026/02/09 10:17 17m retest repro upstream log
2025/12/01 09:25 14m retest repro upstream report log
2025/03/16 22:56 15m retest repro upstream report log
▶ ▼ Fix bisection attempts (9)
Created Duration User Patch Repo Result
2026/02/02 04:09 2m bisect fix upstream error job log
2026/01/03 02:02 1h57m bisect fix upstream OK (0) job log log
2025/11/12 04:29 2h37m bisect fix upstream OK (0) job log log
2025/10/06 20:52 2h03m bisect fix upstream OK (0) job log log
2025/08/28 23:23 2h08m bisect fix upstream OK (0) job log log
2025/07/25 01:47 2h11m bisect fix upstream OK (0) job log log
2025/06/22 00:09 2h01m bisect fix upstream OK (0) job log log
2025/05/21 23:11 2h00m bisect fix upstream OK (0) job log log
2025/04/18 19:14 3h29m 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 dqput+0x79/0x490 fs/quota/dquot.c:868
Read of size 4 at addr 000000000074020f by task syz-executor195/5828

CPU: 0 UID: 0 PID: 5828 Comm: syz-executor195 Not tainted 6.14.0-rc3-syzkaller-00295-g27102b38b8ca #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_report+0xe3/0x5b0 mm/kasan/report.c:524
 kasan_report+0x143/0x180 mm/kasan/report.c:634
 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]
 dqput+0x79/0x490 fs/quota/dquot.c:868
 dqput_all fs/quota/dquot.c:422 [inline]
 __dquot_drop+0x20b/0x420 fs/quota/dquot.c:1608
 jfs_evict_inode+0xbd/0x440 fs/jfs/inode.c:167
 evict+0x4e8/0x9a0 fs/inode.c:796
 dispose_list fs/inode.c:845 [inline]
 evict_inodes+0x6f6/0x790 fs/inode.c:899
 generic_shutdown_super+0xa0/0x2d0 fs/super.c:627
 kill_block_super+0x44/0x90 fs/super.c:1710
 deactivate_locked_super+0xc4/0x130 fs/super.c:473
 cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1413
 task_work_run+0x24f/0x310 kernel/task_work.c:227
 ptrace_notify+0x2d9/0x380 kernel/signal.c:2522
 ptrace_report_syscall include/linux/ptrace.h:415 [inline]
 ptrace_report_syscall_exit include/linux/ptrace.h:477 [inline]
 syscall_exit_work+0xc7/0x1d0 kernel/entry/common.c:173
 syscall_exit_to_user_mode_prepare kernel/entry/common.c:200 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:205 [inline]
 syscall_exit_to_user_mode+0x24a/0x340 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcd7fefe407
Code: 07 00 48 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffc5f71e678 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fcd7fefe407
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc5f71e730
RBP: 00007ffc5f71e730 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000206 R12: 00007ffc5f71f7a0
R13: 00005555914236c0 R14: 0000000000000001 R15: 431bde82d7b634db
 </TASK>
==================================================================

Crashes (6):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/02/23 23:00 upstream 27102b38b8ca d34966d1 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-upstream-fs KASAN: user-memory-access Read in dqput
2025/02/23 18:27 upstream 27102b38b8ca d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: user-memory-access Read in dqput
2025/02/23 18:26 upstream 27102b38b8ca d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: user-memory-access Read in dqput
2025/11/17 08:54 upstream 6a23ae0a96a6 f7988ea4 .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci-snapshot-upstream-root KASAN: user-memory-access Read in dqput
2025/03/02 12:37 upstream ece144f151ac c3901742 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: wild-memory-access Read in dqput
2025/02/28 07:58 upstream 1e15510b71c9 6a8fcbc4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs KASAN: wild-memory-access Read in dqput
* Struck through repros no longer work on HEAD.