upstream test error: KMSAN: kernel-infoleak in irqentry_exit (2)

Status: upstream: reported on 2026/07/15 20:30
Subsystems: kernel
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+6c23bcc14437c2fecd4f@syzkaller.appspotmail.com
First crash: 45d, last: 3h06m
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ID Workflow Result Correct Bug Created Started Finished Revision
7b5673a4 assessment-security DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ✅ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ upstream test error: KMSAN: kernel-infoleak in irqentry_exit (2) 2026/07/17 00:00 2026/07/17 00:00 2026/07/17 04:03 49f47391
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[syzbot] [kernel?] upstream test error: KMSAN: kernel-infoleak in irqentry_exit (2) 0 (1) 2026/07/15 20:30

Sample crash report:
=====================================================
BUG: KMSAN: kernel-infoleak in rseq_set_ids_get_csaddr include/linux/rseq_entry.h:503 [inline]
BUG: KMSAN: kernel-infoleak in rseq_update_usr include/linux/rseq_entry.h:537 [inline]
BUG: KMSAN: kernel-infoleak in rseq_exit_user_update include/linux/rseq_entry.h:646 [inline]
BUG: KMSAN: kernel-infoleak in __rseq_exit_to_user_mode_restart include/linux/rseq_entry.h:675 [inline]
BUG: KMSAN: kernel-infoleak in rseq_exit_to_user_mode_restart include/linux/rseq_entry.h:704 [inline]
BUG: KMSAN: kernel-infoleak in exit_to_user_mode_loop kernel/entry/common.c:103 [inline]
BUG: KMSAN: kernel-infoleak in __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
BUG: KMSAN: kernel-infoleak in irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:244 [inline]
BUG: KMSAN: kernel-infoleak in irqentry_exit_to_user_mode include/linux/irq-entry-common.h:315 [inline]
BUG: KMSAN: kernel-infoleak in irqentry_exit+0x4c1/0xa60 kernel/entry/common.c:165
 rseq_set_ids_get_csaddr include/linux/rseq_entry.h:503 [inline]
 rseq_update_usr include/linux/rseq_entry.h:537 [inline]
 rseq_exit_user_update include/linux/rseq_entry.h:646 [inline]
 __rseq_exit_to_user_mode_restart include/linux/rseq_entry.h:675 [inline]
 rseq_exit_to_user_mode_restart include/linux/rseq_entry.h:704 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:103 [inline]
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:244 [inline]
 irqentry_exit_to_user_mode include/linux/irq-entry-common.h:315 [inline]
 irqentry_exit+0x4c1/0xa60 kernel/entry/common.c:165
 exc_page_fault+0x7e/0xb0 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:595

Local variable to.i.i created at:
 __do_sys_epoll_wait fs/eventpoll.c:2835 [inline]
 __se_sys_epoll_wait fs/eventpoll.c:2832 [inline]
 __x64_sys_epoll_wait+0xba/0x3a0 fs/eventpoll.c:2832
 x64_sys_call+0x23ff/0x3350 arch/x86/include/generated/asm/syscalls_64.h:233

Bytes 0-3 of 4 are uninitialized
Memory access of size 4 starts at ffff888106dc3e78
Data copied to user address 00007f6133545680

CPU: 0 UID: 0 PID: 4940 Comm: udevd Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
=====================================================

Crashes (313):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/28 15:38 upstream 1b78070aaef6 bcbc8ceb .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/27 23:14 upstream 1b78070aaef6 e2fa417d .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/27 00:58 upstream 73e3f0710014 a2b77b9e .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/26 17:30 upstream 45c13f3f9e3b a2b77b9e .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/26 02:50 upstream 45c13f3f9e3b 6a91adb4 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/25 21:57 upstream 73ae59e97596 614e416a .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/25 10:18 upstream 66498c75b4f8 614e416a .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/24 23:12 upstream 66498c75b4f8 23caa175 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/24 13:40 upstream 0a0d1d55dad5 23caa175 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/24 03:30 upstream 0a0d1d55dad5 1e72964b .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/23 22:41 upstream 4352b8aee980 1e72964b .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/23 20:41 upstream b6b019a1d9b9 1e72964b .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/23 17:30 upstream 388b607d107c 1e72964b .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/21 21:49 upstream 26260251022f 1e72964b .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/21 20:18 upstream 2be02a7c996a 1e72964b .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/21 06:17 upstream 818bebeb63dd 1e72964b .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/21 04:29 upstream 8dbbc7e18894 1e72964b .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/20 23:09 upstream c84d3e3130df 1e72964b .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/07/16 23:36 upstream 481ed5dd3ed7 8f30cfd7 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/07/15 09:16 upstream 58717b2a1365 209f0369 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/29 21:49 upstream 08dbfad3f504 2f52988a .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/29 05:54 upstream cf72cbb39da8 2f52988a .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/29 02:11 upstream cf72cbb39da8 bcbc8ceb .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/28 21:16 upstream 548e7bcd0c54 bcbc8ceb .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/28 18:53 upstream c20313e98b04 bcbc8ceb .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/28 14:13 upstream 1b78070aaef6 bcbc8ceb .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/28 00:18 upstream 1b78070aaef6 e2fa417d .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/27 22:16 upstream 3ba13f5e7180 e2fa417d .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/27 20:39 upstream f7e3f4d9f425 e2fa417d .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/27 18:28 upstream 18fbf5151d2c e2fa417d .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/27 16:21 upstream 73e3f0710014 e2fa417d .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/27 02:01 upstream 73e3f0710014 a2b77b9e .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/26 23:57 upstream b035a8be20dd a2b77b9e .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/26 22:30 upstream b81e34131907 a2b77b9e .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/26 19:31 upstream 502d45774af0 a2b77b9e .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/25 23:24 upstream 45c13f3f9e3b 614e416a .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/25 20:57 upstream 73ae59e97596 614e416a .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/24 20:07 upstream 2f43193b8818 23caa175 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/24 17:22 upstream 47096fc3d064 23caa175 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/23 23:45 upstream 4352b8aee980 1e72964b .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/23 01:09 upstream 2709dd5ae32f 1e72964b .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/22 17:11 upstream 66fb95a52111 1e72964b .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/21 23:05 upstream 26260251022f 1e72964b .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/21 17:51 upstream 531ed942bb0d 1e72964b .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/21 02:44 upstream 7f063b2f17ea 1e72964b .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/08/21 00:55 upstream 77ae27fd98f3 1e72964b .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
* Struck through repros no longer work on HEAD.