KASAN: wild-memory-access Write in __journal_read_write

Status: upstream: reported C repro on 2026/09/30 14:25
Subsystems: dm
Labels: prio:normal
[Documentation on labels]
Reported-by: syzbot+675c91651049ad042c5f@syzkaller.appspotmail.com
Fix commit: fc79aeb86a2c dm-integrity: validate the superblock on resume
Patched on: [ci-qemu-gce-upstream-auto ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-snapshot-upstream-root ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci-upstream-rust-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce], missing on: [ci-qemu-native-arm64-kvm ci-qemu2-riscv64 ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64 ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root ci2-upstream-usb]
First crash: 13d, last: 9d03h
▶ ▼ ✨ AI Jobs (2)
ID Workflow Result Correct Bug Created Started Finished Revision
fb8940e3 repro-c Reproduced: ✅ ❓ KASAN: wild-memory-access Write in __journal_read_write 2026/09/30 05:14 2026/09/30 05:14 2026/09/30 14:09 7808aef4
97a510d5 assessment-security DenialOfService: ✅ Exploitable: ✅ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ KASAN: wild-memory-access Write in __journal_read_write 2026/09/28 00:44 2026/09/28 00:44 2026/09/28 01:59 a3c7249d
▶ ▼ Discussions (2)
Title Replies (including bot) Last reply
[PATCH] dm-integrity: validate the superblock on resume 1 (1) 2026/09/30 16:42
[syzbot] [dm?] KASAN: wild-memory-access Write in __journal_read_write 0 (1) 2026/09/30 14:25
▶ ▼ Last patch testing requests (1)
Created Duration User Patch Repo Result
2026/09/30 14:10 14m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 551c722f40809618230001baccf219193e22fc5a report job log log

Sample crash report:
==================================================================
BUG: KASAN: wild-memory-access in __journal_read_write+0xc29/0x1f10 drivers/md/dm-integrity.c:2288
Write of size 512 at addr 0005088000000000 by task syz-executor338/6039

CPU: 0 UID: 0 PID: 6039 Comm: syz-executor338 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:186 [inline]
 kasan_check_range+0x10f/0x1e0 mm/kasan/generic.c:200
 __asan_memcpy+0x3c/0x60 mm/kasan/shadow.c:106
 __journal_read_write+0xc29/0x1f10 drivers/md/dm-integrity.c:2288
 dm_integrity_map_continue+0x243f/0x33b0 drivers/md/dm-integrity.c:2574
 dm_integrity_map+0x6cc/0xc90 drivers/md/dm-integrity.c:2204
 __map_bio+0x597/0x660 drivers/md/dm.c:1435
 __split_and_process_bio drivers/md/dm.c:1769 [inline]
 dm_split_and_process_bio drivers/md/dm.c:2043 [inline]
 dm_submit_bio+0x5b6/0x2950 drivers/md/dm.c:2099
 __submit_bio block/blk-core.c:681 [inline]
 __submit_bio+0x20e/0x3d0 block/blk-core.c:670
 __submit_bio_noacct block/blk-core.c:724 [inline]
 submit_bio_noacct_nocheck+0x736/0xc00 block/blk-core.c:792
 submit_bio_noacct+0xc93/0x2130 block/blk-core.c:925
 bio_await+0x1fa/0x240 block/bio.c:1581
 submit_bio_wait+0x19/0x60 block/bio.c:1599
 __blkdev_direct_IO_simple+0x4cb/0x8c0 block/fops.c:98
 blkdev_direct_IO+0xbee/0x2030 block/fops.c:429
 blkdev_direct_write block/fops.c:699 [inline]
 blkdev_write_iter+0x703/0xd30 block/fops.c:767
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6af/0x1050 fs/read_write.c:687
 ksys_pwrite64 fs/read_write.c:794 [inline]
 __do_sys_pwrite64 fs/read_write.c:802 [inline]
 __se_sys_pwrite64 fs/read_write.c:799 [inline]
 __x64_sys_pwrite64+0x1eb/0x250 fs/read_write.c:799
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5408351ab7
Code: 48 89 fa 4c 89 df e8 98 1d 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffc07ac8820 EFLAGS: 00000202 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 0000555592860400 RCX: 00007f5408351ab7
RDX: 0000000000000400 RSI: 0000555592863000 RDI: 0000000000000007
RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00005555928627a0
R13: 0000000000000007 R14: 0000555592863000 R15: 00000000c138fd06
 </TASK>
==================================================================

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/09/30 14:24 git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 551c722f4080 a3c7249d .config console log report C ci-qemu-upstream KASAN: wild-memory-access Write in __journal_read_write
2026/09/26 05:36 upstream f14572c203d5 a3c7249d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream KASAN: wild-memory-access Write in __journal_read_write
* Struck through repros no longer work on HEAD.