From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f207.google.com (mail-il1-f207.google.com [209.85.166.207]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1821C1E4BE for ; Sat, 1 Mar 2025 12:45:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.207 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740833126; cv=none; b=VE7DRry6gG2QHvpuC5x5RKESuaC+A9Mbl8tl5qduQg3WGqjWqce8Znxfnx/+jyh1NXFBNwgrelJTUJllyxNTcFvn18CiuUcIpQOjZELOTDivdEG2nquPbvoyZ5Nv8CBKrp0oUD0ZzluSNrdAGalt3S6IpECC8WgnnjaLzmqlYns= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740833126; c=relaxed/simple; bh=nge10YJ9o3E9q9UptcYzZwL7sKC0Uq263Ftv4GNbgWo=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=n+7KtP3AmC2OIw5/8GU8vFZ8RmDGZ27/Ee9OYY14grH96atN3RZO5UhSH+a/X5sYYntmgn0XcwoUDCB2axyPmNQeXPdb30Fjq2nYFtA0gxz7s4rcYJzdp4lPXtIziwoOJgcD0Gn1XDTWima2AxotPSayQKg5wdoVp6jAp7IwZv8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.166.207 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-il1-f207.google.com with SMTP id e9e14a558f8ab-3d054d79dacso58053635ab.2 for ; Sat, 01 Mar 2025 04:45:24 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1740833124; x=1741437924; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=8Q95zOLSYKCLrzAjQokGWyvnP2OsuHAOqXHJfcqwyKo=; b=HE8Cq8JFTsveB9AjeNADT+i194cGY+E4jgHtQ1lkzRPzHVPtJA2TVdUn3+QZlOqNU7 8AjSq8OeGiaB2D7ZpQZ4pGCvQyEau58s5phTxHNnFDcVr3Vlh0RhSu66F+dP+c4Qo5ta FVgrexECNxze0HTw1HLCb8sWaxTeOiiubCBQBge4gDeUkxog7yLVFFrWVXm3Peq01BXp urmL7vB9VbHMdJVmAI78oyKlIVStaG4e5RIx/UcPw7gJr9666rMSWQd3hxYyFvJES4hY WRj9DzyIR5K8H6N7XNOnIM97DE1jI24G4/R3HVvBc7exq6nrwBAB1xrtqF3cDZM4ZxdP tdYA== X-Forwarded-Encrypted: i=1; AJvYcCVo6QbH8eX3LT/S2PIHVD8DLKly/roGEHYw9qbOERWu3pDaczzNSsrGzkq2jZMZB4br5GvzrsJAA8ZgfHg=@vger.kernel.org X-Gm-Message-State: AOJu0Yw6Wlold5HIxP25ltQ7/x1xPwDgb1dR+ap8SaLzcE8z1ZOjxs8e b9kSS823woYDRoWg/SHn49IBAwP42bPYSfbntBJG49gEcLK9Osvzn2nBX2GdY6ay9d/gND2EIAu V0gf0SFOjVsqJ81/Ze8c3IFMQc5fTdRkffOj2/BS0eKrLwnq43Fhwg2w= X-Google-Smtp-Source: AGHT+IE5s3royZQYoqIz9BOPOExK81G7mfqUYFmrRU/4SNieha6SBeizmY8gV4VqmfFf+0UXzsYSDo0j7wz+nYO9nrb4GSPcuqKI Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1a67:b0:3d3:dcfd:2768 with SMTP id e9e14a558f8ab-3d3e6e458d8mr75129835ab.4.1740833124198; Sat, 01 Mar 2025 04:45:24 -0800 (PST) Date: Sat, 01 Mar 2025 04:45:24 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67c30164.050a0220.dc10f.0167.GAE@google.com> Subject: [syzbot] [kernel?] WARNING in exit_itimers From: syzbot To: anna-maria@linutronix.de, frederic@kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: d082ecbc71e9 Linux 6.14-rc4 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=173537a4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=299fb852e91f4f3c dashboard link: https://syzkaller.appspot.com/bug?extid=d9da13b17db05637e02d compiler: aarch64-linux-gnu-gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: arm64 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/384ffdcca292/non_bootable_disk-d082ecbc.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/bdb92972b307/vmlinux-d082ecbc.xz kernel image: https://storage.googleapis.com/syzbot-assets/15450a9ada87/Image-d082ecbc.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d9da13b17db05637e02d@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: CPU: 0 PID: 21835 at kernel/time/posix-timers.c:1109 exit_itimers+0x238/0x34c kernel/time/posix-timers.c:1109 Modules linked in: CPU: 0 UID: 0 PID: 21835 Comm: syz.0.5419 Not tainted 6.14.0-rc4-syzkaller #0 Hardware name: linux,dummy-virt (DT) pstate: 21402009 (nzCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--) pc : exit_itimers+0x238/0x34c kernel/time/posix-timers.c:1109 lr : itimer_delete kernel/time/posix-timers.c:1081 [inline] lr : exit_itimers+0x17c/0x34c kernel/time/posix-timers.c:1103 sp : ffff800088ffbbf0 x29: ffff800088ffbbf0 x28: 0000000000000001 x27: f0f0000007b99a38 x26: 0000000000000000 x25: 0000000000000000 x24: f0f0000007b99240 x23: 0000000000000000 x22: f0f0000007b99240 x21: f0f0000007b99240 x20: 0000000000000001 x19: f0f0000007b99240 x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: 0000ffffea2d02c8 x14: f0f0000007b992c0 x13: ffff8000828500c8 x12: 0000000000000001 x11: 00000355b7b9e14b x10: 5d48c5ec52c2bb1a x9 : b4052c63a0d52864 x8 : ffff800088ffbe38 x7 : fdf0000003263488 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000001000001 x3 : 00000000000001f4 x2 : fff000007f8d0758 x1 : f0f0000007b99240 x0 : fdf0000016d5fb60 Call trace: exit_itimers+0x238/0x34c kernel/time/posix-timers.c:1109 (P) do_exit+0x17c/0x98c kernel/exit.c:912 do_group_exit+0x34/0x90 kernel/exit.c:1087 copy_siginfo_to_user+0x0/0xec kernel/signal.c:3036 do_signal+0x94/0x360 arch/arm64/kernel/signal.c:1658 do_notify_resume+0xd8/0x164 arch/arm64/kernel/entry-common.c:148 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline] el0_svc+0xc0/0xe0 arch/arm64/kernel/entry-common.c:745 el0t_64_sync_handler+0x10c/0x138 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x1a4/0x1a8 arch/arm64/kernel/entry.S:600 ---[ end trace 0000000000000000 ]--- ------------[ cut here ]------------ rcuref - imbalanced put() WARNING: CPU: 0 PID: 21835 at lib/rcuref.c:267 rcuref_put_slowpath+0xbc/0xd0 lib/rcuref.c:267 Modules linked in: CPU: 0 UID: 0 PID: 21835 Comm: syz.0.5419 Tainted: G W 6.14.0-rc4-syzkaller #0 Tainted: [W]=WARN Hardware name: linux,dummy-virt (DT) pstate: 61402009 (nZCv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--) pc : rcuref_put_slowpath+0xbc/0xd0 lib/rcuref.c:267 lr : rcuref_put_slowpath+0xbc/0xd0 lib/rcuref.c:267 sp : ffff800088ffbbd0 x29: ffff800088ffbbd0 x28: 0000000000000001 x27: f0f0000007b99a38 x26: 0000000000000000 x25: 0000000000000000 x24: f0f0000007b99240 x23: 0000000000000000 x22: f0f0000007b99240 x21: f0f0000007b99240 x20: 00000000ffffffff x19: fdf0000016d5fc28 x18: 000000000001cf9f x17: 0000000000000000 x16: 0000000000000000 x15: ffff800088ffb560 x14: 00000000ffffffea x13: ffff800088ffb988 x12: ffff80008292d920 x11: fffffffffffd8010 x10: fffffffffffd7fe8 x9 : 0000000000009be8 x8 : c0000000ffffe67f x7 : ffff80008287d898 x6 : 0000000000023ba8 x5 : ffff8000828a14c8 x4 : 0000000000000000 x3 : 0000000000000000 x2 : 0000000000000000 x1 : 0000000000000000 x0 : f0f0000007b99240 Call trace: rcuref_put_slowpath+0xbc/0xd0 lib/rcuref.c:267 (P) __rcuref_put include/linux/rcuref.h:94 [inline] rcuref_put include/linux/rcuref.h:150 [inline] posixtimer_putref include/linux/posix-timers.h:226 [inline] posix_timer_cleanup_ignored kernel/time/posix-timers.c:977 [inline] exit_itimers+0x334/0x34c kernel/time/posix-timers.c:1114 do_exit+0x17c/0x98c kernel/exit.c:912 do_group_exit+0x34/0x90 kernel/exit.c:1087 copy_siginfo_to_user+0x0/0xec kernel/signal.c:3036 do_signal+0x94/0x360 arch/arm64/kernel/signal.c:1658 do_notify_resume+0xd8/0x164 arch/arm64/kernel/entry-common.c:148 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline] el0_svc+0xc0/0xe0 arch/arm64/kernel/entry-common.c:745 el0t_64_sync_handler+0x10c/0x138 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x1a4/0x1a8 arch/arm64/kernel/entry.S:600 ---[ end trace 0000000000000000 ]--- --- 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