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Wed, 15 Jul 2026 13:30:32 -0700 (PDT) Date: Wed, 15 Jul 2026 13:30:32 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a57ede8.c96faac9.59e0.0009.GAE@google.com> Subject: [syzbot] [kernel?] upstream test error: KMSAN: kernel-infoleak in irqentry_exit (2) From: syzbot To: linux-kernel@vger.kernel.org, luto@kernel.org, peterz@infradead.org, syzkaller-bugs@googlegroups.com, tglx@kernel.org Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 58717b2a1365 Merge tag 'sound-7.2-rc4' of git://git.kernel.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16f378b9580000 kernel config: https://syzkaller.appspot.com/x/.config?x=c2842025f4a17812 dashboard link: https://syzkaller.appspot.com/bug?extid=6c23bcc14437c2fecd4f compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/2f3dab040325/disk-58717b2a.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a67db2fa7c32/vmlinux-58717b2a.xz kernel image: https://storage.googleapis.com/syzbot-assets/21584b582063/bzImage-58717b2a.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6c23bcc14437c2fecd4f@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: kernel-infoleak in rseq_exit_user_update include/linux/rseq_entry.h:626 [inline] BUG: KMSAN: kernel-infoleak in __rseq_exit_to_user_mode_restart include/linux/rseq_entry.h:674 [inline] BUG: KMSAN: kernel-infoleak in rseq_exit_to_user_mode_restart include/linux/rseq_entry.h:703 [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+0x34f/0xa40 kernel/entry/common.c:165 rseq_exit_user_update include/linux/rseq_entry.h:626 [inline] __rseq_exit_to_user_mode_restart include/linux/rseq_entry.h:674 [inline] rseq_exit_to_user_mode_restart include/linux/rseq_entry.h:703 [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+0x34f/0xa40 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 end_time.i.i created at: __do_sys_poll fs/select.c:1063 [inline] __se_sys_poll fs/select.c:1060 [inline] __x64_sys_poll+0x87/0x540 fs/select.c:1060 x64_sys_call+0x3130/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:8 Bytes 0-3 of 4 are uninitialized Memory access of size 4 starts at ffff888129eefe8c Data copied to user address 00007f173fec6adc CPU: 1 UID: 0 PID: 5434 Comm: dhcpcd-run-hook Not tainted syzkaller #0 PREEMPT(lazy) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026 ===================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup