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KASAN: null-ptr-deref Write in xlog_cil_commit

Status: upstream: reported C repro on 2023/03/10 01:55
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+798d81a034a88c5e8aad@syzkaller.appspotmail.com
First crash: 902d, last: 20h10m
Fix commit to backport (bisect log) :
tree: upstream
commit 8dc9384b7d75012856b02ff44c37566a55fc2abf
Author: Dave Chinner <dchinner@redhat.com>
Date: Wed Jan 5 01:22:18 2022 +0000

  xfs: reduce kvmalloc overhead for CIL shadow buffers

  
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2023/05/07 linux-5.15.y (ToT) 8a7f2a5c5aa1 C [report] KASAN: null-ptr-deref Write in xlog_cil_commit
2023/05/07 upstream (ToT) fc4354c6e5c2 C Didn't crash
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream BUG: corrupted list in xlog_cil_commit xfs 8 6 442d 453d 0/29 auto-obsoleted due to no activity on 2024/09/20 09:02
upstream BUG: corrupted list in xlog_cil_commit (2) xfs 8 3 248d 284d 0/29 auto-obsoleted due to no activity on 2025/03/22 12:28
▶ ▼ Fix bisection attempts (1)
Created Duration User Patch Repo Result
2023/10/24 00:21 4h55m fix candidate upstream OK (1) job log

Sample crash report:
RBP: 00007ffe340dc0c0 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fffb R11: 0000000000000246 R12: 0000000000000001
R13: 00007fec098bcfa0 R14: 00007fec098bcfa0 R15: 0000000000000004
 </TASK>
==================================================================
BUG: KASAN: null-ptr-deref in xlog_cil_alloc_shadow_bufs fs/xfs/xfs_log_cil.c:225 [inline]
BUG: KASAN: null-ptr-deref in xlog_cil_commit+0x2c7/0x2010 fs/xfs/xfs_log_cil.c:1264
Write of size 88 at addr 0000000000000000 by task syz.0.18/4342

CPU: 1 PID: 4342 Comm: syz.0.18 Not tainted 5.15.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 __kasan_report mm/kasan/report.c:438 [inline]
 kasan_report+0xd5/0x130 mm/kasan/report.c:451
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x27b/0x290 mm/kasan/generic.c:189
 memset+0x1e/0x40 mm/kasan/shadow.c:44
 xlog_cil_alloc_shadow_bufs fs/xfs/xfs_log_cil.c:225 [inline]
 xlog_cil_commit+0x2c7/0x2010 fs/xfs/xfs_log_cil.c:1264
 __xfs_trans_commit+0x6b2/0xc50 fs/xfs/xfs_trans.c:881
 xfs_vn_update_time+0x39a/0x510 fs/xfs/xfs_iops.c:1072
 inode_update_time fs/inode.c:1893 [inline]
 file_update_time+0x373/0x400 fs/inode.c:2083
 xfs_file_fallocate+0x22b/0xb40 fs/xfs/xfs_file.c:956
 vfs_fallocate+0x587/0x6f0 fs/open.c:308
 ksys_fallocate fs/open.c:331 [inline]
 __do_sys_fallocate fs/open.c:339 [inline]
 __se_sys_fallocate fs/open.c:337 [inline]
 __x64_sys_fallocate+0xbd/0x100 fs/open.c:337
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fec09695be9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe340dc068 EFLAGS: 00000246 ORIG_RAX: 000000000000011d
RAX: ffffffffffffffda RBX: 00007fec098bcfa0 RCX: 00007fec09695be9
RDX: 000000000010000a RSI: 0000000000000040 RDI: 0000000000000004
RBP: 00007ffe340dc0c0 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fffb R11: 0000000000000246 R12: 0000000000000001
R13: 00007fec098bcfa0 R14: 00007fec098bcfa0 R15: 0000000000000004
 </TASK>
==================================================================

Crashes (1534):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/08/24 16:14 linux-5.15.y c79648372d02 bf27483f .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-5-15-kasan KASAN: null-ptr-deref Write in xlog_cil_commit
2023/03/20 02:48 linux-5.15.y 8020ae3c051d 7939252e .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan KASAN: null-ptr-deref Write in xlog_cil_commit
2025/05/14 22:43 linux-5.15.y 3b8db0e4f263 a4fa04ef .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2025/02/03 01:20 linux-5.15.y c16c81c81336 568559e4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2025/02/03 00:59 linux-5.15.y c16c81c81336 568559e4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2024/11/30 10:23 linux-5.15.y 0a51d2d4527b 68914665 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2024/08/21 21:47 linux-5.15.y fa93fa65db6e db5852f9 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2024/05/13 13:06 linux-5.15.y 284087d4f7d5 9026e142 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2024/01/28 12:33 linux-5.15.y 6139f2a02fe0 cc4a4020 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2023/10/19 19:21 linux-5.15.y 02e21884dcf2 42e1d524 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2023/07/08 14:37 linux-5.15.y d54cfc420586 668cb1fa .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2023/03/30 06:00 linux-5.15.y 115472395b0a f325deb0 .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2023/03/10 02:13 linux-5.15.y d9b4a0c83a2d f08b59ac .config console log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2025/08/27 15:24 linux-5.15.y c79648372d02 e12e5ba4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: null-ptr-deref Write in xlog_cil_commit
2025/08/24 15:49 linux-5.15.y c79648372d02 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: null-ptr-deref Write in xlog_cil_commit
2025/08/24 15:35 linux-5.15.y c79648372d02 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: null-ptr-deref Write in xlog_cil_commit
2025/08/17 20:57 linux-5.15.y c79648372d02 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: null-ptr-deref Write in xlog_cil_commit
2025/08/17 05:45 linux-5.15.y c79648372d02 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: null-ptr-deref Write in xlog_cil_commit
2025/08/16 14:48 linux-5.15.y c79648372d02 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: null-ptr-deref Write in xlog_cil_commit
2025/08/16 10:45 linux-5.15.y c79648372d02 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: null-ptr-deref Write in xlog_cil_commit
2025/08/11 05:06 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: null-ptr-deref Write in xlog_cil_commit
2025/08/11 02:54 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: null-ptr-deref Write in xlog_cil_commit
2025/08/10 10:21 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: null-ptr-deref Write in xlog_cil_commit
2025/08/09 16:58 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: null-ptr-deref Write in xlog_cil_commit
2025/08/09 14:42 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: null-ptr-deref Write in xlog_cil_commit
2025/08/04 16:16 linux-5.15.y c79648372d02 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: null-ptr-deref Write in xlog_cil_commit
2025/08/02 21:59 linux-5.15.y c79648372d02 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: null-ptr-deref Write in xlog_cil_commit
2025/07/30 20:12 linux-5.15.y c79648372d02 f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: null-ptr-deref Write in xlog_cil_commit
2025/07/27 17:35 linux-5.15.y c79648372d02 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: null-ptr-deref Write in xlog_cil_commit
2025/07/27 06:21 linux-5.15.y c79648372d02 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: null-ptr-deref Write in xlog_cil_commit
2025/07/26 12:12 linux-5.15.y c79648372d02 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: null-ptr-deref Write in xlog_cil_commit
2025/07/21 00:27 linux-5.15.y c79648372d02 7117feec .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan KASAN: null-ptr-deref Write in xlog_cil_commit
2025/08/27 12:54 linux-5.15.y c79648372d02 e12e5ba4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2025/08/27 10:53 linux-5.15.y c79648372d02 e12e5ba4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2025/08/25 09:59 linux-5.15.y c79648372d02 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2025/08/25 04:59 linux-5.15.y c79648372d02 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2025/08/25 03:44 linux-5.15.y c79648372d02 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2025/08/18 23:47 linux-5.15.y c79648372d02 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2025/08/18 10:02 linux-5.15.y c79648372d02 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2025/08/06 19:45 linux-5.15.y c79648372d02 ffe1dd46 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2025/08/05 09:57 linux-5.15.y c79648372d02 f5bcc8dc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2025/08/05 01:42 linux-5.15.y c79648372d02 f5bcc8dc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2025/08/04 11:24 linux-5.15.y c79648372d02 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2025/08/04 08:20 linux-5.15.y c79648372d02 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2025/08/03 12:57 linux-5.15.y c79648372d02 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2025/08/03 11:27 linux-5.15.y c79648372d02 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2025/08/03 06:11 linux-5.15.y c79648372d02 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2025/08/02 10:31 linux-5.15.y c79648372d02 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2025/08/02 07:44 linux-5.15.y c79648372d02 7368264b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2025/08/01 23:21 linux-5.15.y c79648372d02 40127d41 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2025/07/31 13:59 linux-5.15.y c79648372d02 f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2025/07/31 07:35 linux-5.15.y c79648372d02 f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2025/07/30 10:26 linux-5.15.y c79648372d02 f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2025/07/30 09:03 linux-5.15.y c79648372d02 f8f2b4da .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2025/07/28 08:27 linux-5.15.y c79648372d02 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2025/07/27 22:53 linux-5.15.y c79648372d02 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2025/07/27 21:46 linux-5.15.y c79648372d02 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2025/07/27 07:46 linux-5.15.y c79648372d02 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2025/07/27 00:37 linux-5.15.y c79648372d02 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2025/07/26 05:18 linux-5.15.y c79648372d02 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2025/07/25 12:21 linux-5.15.y c79648372d02 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2025/07/20 21:29 linux-5.15.y c79648372d02 7117feec .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
2023/03/10 01:55 linux-5.15.y d9b4a0c83a2d f08b59ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 KASAN: null-ptr-deref Write in xlog_cil_commit
* Struck through repros no longer work on HEAD.