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: 104d, last: 13h35m
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ID Workflow Result Correct Bug Created Started Finished Revision
2a99875a repro-c 💥 upstream test error: KMSAN: kernel-infoleak in irqentry_exit (2) 2026/09/25 05:14 2026/09/25 05:14 2026/09/26 00:57 f281d9d2
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+0x4c8/0xa80 kernel/entry/common.c:152
 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+0x4c8/0xa80 kernel/entry/common.c:152
 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 ffff88811afefe78
Data copied to user address 00007f3e38ca9680

CPU: 0 UID: 0 PID: 4943 Comm: udevd Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
=====================================================

Crashes (686):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/26 20:48 upstream d135ab453a74 168cb7a2 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/26 19:14 upstream fb2c3f44a7e1 168cb7a2 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/26 06:43 upstream 6b4b543fa187 1d9ca40b .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/26 04:54 upstream 390febb5805d 1d9ca40b .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/25 10:08 upstream 21a7f44fd076 1d9ca40b .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/25 08:04 upstream a32e63a613aa 1d9ca40b .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/25 04:10 upstream 330517c63aa9 1d9ca40b .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/24 06:47 upstream 5b0764a53235 1d9ca40b .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/24 02:53 upstream 4169c9c90532 d566bfda .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/23 06:02 upstream 734bef548a96 4ba27f85 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/23 03:02 upstream 864c07de0c7d 4ba27f85 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/22 23:24 upstream a1c2b1da93f5 4ba27f85 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/22 21:01 upstream 2a08195e4db5 4ba27f85 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/22 02:28 upstream ccc4d9f8912a 61c200c7 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/21 09:10 upstream a804c5742bff 61c200c7 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/21 00:27 upstream 4a8bdffce502 df8746fb .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/20 22:43 upstream 0e135910deec df8746fb .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/19 00:59 upstream c03c1a14507d 432c0077 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/09/22 01:29 upstream f0100363d8c3 e12281bd .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
2026/10/26 22:03 upstream d135ab453a74 168cb7a2 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/26 15:49 upstream 6b4b543fa187 168cb7a2 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/26 07:44 upstream 6b4b543fa187 1d9ca40b .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/25 11:36 upstream 21a7f44fd076 1d9ca40b .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/25 05:48 upstream 330517c63aa9 1d9ca40b .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/25 03:03 upstream 6fba331225f5 1d9ca40b .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/25 01:27 upstream b23545529c21 1d9ca40b .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/24 08:09 upstream 5b0764a53235 1d9ca40b .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/24 05:05 upstream 17bb0e2f6c80 d566bfda .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/24 01:50 upstream 4169c9c90532 d566bfda .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/23 23:18 upstream 90b754d40117 d566bfda .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/23 20:57 upstream 7a78f7ba9f24 d566bfda .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/23 09:22 upstream 734bef548a96 d566bfda .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/23 04:05 upstream 864c07de0c7d 4ba27f85 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/23 00:39 upstream a1c2b1da93f5 4ba27f85 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/22 08:36 upstream 7be4bc52fd9e 4ba27f85 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/22 06:15 upstream 4403278e4ea2 4ba27f85 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/22 03:33 upstream 4403278e4ea2 61c200c7 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/22 01:31 upstream bb29b957eaaa 61c200c7 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/21 21:03 upstream 9ba46df34488 61c200c7 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/21 07:36 upstream 2c455ddca782 df8746fb .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/21 06:12 upstream 9e947d96915a df8746fb .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/21 01:35 upstream 4cbdd58dfa7a df8746fb .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/20 12:54 upstream f47d223627f8 df8746fb .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/20 09:01 upstream f47d223627f8 72cdc28d .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/19 18:24 upstream c03c1a14507d 72cdc28d .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/18 22:11 upstream f909e534f5e3 432c0077 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root upstream test error: KMSAN: kernel-infoleak in irqentry_exit
2026/10/18 19:21 upstream 53cbbb09c1b8 432c0077 .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.