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Message-ID: <000000000000910ad106089f45eb@google.com> Date: Thu, 26 Oct 2023 07:20:20 -0700 From: syzbot <syzbot+df3f3ef31f60781fa911@...kaller.appspotmail.com> To: davem@...emloft.net, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, reibax@...il.com, richardcochran@...il.com, syzkaller-bugs@...glegroups.com Subject: [syzbot] [net?] BUG: corrupted list in ptp_open Hello, syzbot found the following issue on: HEAD commit: 2030579113a1 Add linux-next specific files for 20231020 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=16ab79a3680000 kernel config: https://syzkaller.appspot.com/x/.config?x=37404d76b3c8840e dashboard link: https://syzkaller.appspot.com/bug?extid=df3f3ef31f60781fa911 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=140aa715680000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11037669680000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/a99a981e5d78/disk-20305791.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/073a5ba6a2a6/vmlinux-20305791.xz kernel image: https://storage.googleapis.com/syzbot-assets/c7c1a7107f7b/bzImage-20305791.xz The issue was bisected to: commit 8f5de6fb245326704f37d91780b9a10253a8a100 Author: Xabier Marquiegui <reibax@...il.com> Date: Wed Oct 11 22:39:55 2023 +0000 ptp: support multiple timestamp event readers bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=15475b89680000 final oops: https://syzkaller.appspot.com/x/report.txt?x=17475b89680000 console output: https://syzkaller.appspot.com/x/log.txt?x=13475b89680000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+df3f3ef31f60781fa911@...kaller.appspotmail.com Fixes: 8f5de6fb2453 ("ptp: support multiple timestamp event readers") list_add corruption. prev->next should be next (ffff88814a1325e8), but was ffff888078d25048. (prev=ffff888078d21048). ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:32! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 7237 Comm: syz-executor182 Not tainted 6.6.0-rc6-next-20231020-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 RIP: 0010:__list_add_valid_or_report+0xb6/0x100 lib/list_debug.c:32 Code: e8 2f a5 3a fd 0f 0b 48 89 d9 48 c7 c7 40 9d e9 8a e8 1e a5 3a fd 0f 0b 48 89 f1 48 c7 c7 c0 9d e9 8a 48 89 de e8 0a a5 3a fd <0f> 0b 48 89 f2 48 89 d9 48 89 ee 48 c7 c7 40 9e e9 8a e8 f3 a4 3a RSP: 0018:ffffc90009b3f898 EFLAGS: 00010286 RAX: 0000000000000075 RBX: ffff88814a1325e8 RCX: ffffffff816bb8d9 RDX: 0000000000000000 RSI: ffffffff816c4d42 RDI: 0000000000000005 RBP: ffff88807c7a9048 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000000 R11: 0000000000000001 R12: ffff88814a132000 R13: ffffc90009b3f900 R14: ffff888078d21048 R15: ffff88807c7a9048 FS: 0000555556c00380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffef0aa1138 CR3: 000000007d17e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> __list_add_valid include/linux/list.h:88 [inline] __list_add include/linux/list.h:150 [inline] list_add_tail include/linux/list.h:183 [inline] ptp_open+0x1c5/0x4f0 drivers/ptp/ptp_chardev.c:122 posix_clock_open+0x17e/0x240 kernel/time/posix-clock.c:134 chrdev_open+0x26d/0x6e0 fs/char_dev.c:414 do_dentry_open+0x8d4/0x18d0 fs/open.c:948 do_open fs/namei.c:3621 [inline] path_openat+0x1d36/0x2cd0 fs/namei.c:3778 do_filp_open+0x1dc/0x430 fs/namei.c:3808 do_sys_openat2+0x176/0x1e0 fs/open.c:1440 do_sys_open fs/open.c:1455 [inline] __do_sys_openat fs/open.c:1471 [inline] __se_sys_openat fs/open.c:1466 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1466 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7fc6c2099ae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffef0aa1238 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc6c2099ae9 RDX: 0000000000000000 RSI: 0000000020000300 RDI: ffffffffffffff9c RBP: 00000000000f4240 R08: 0000000000000000 R09: 00000000000000a0 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000130fc R13: 00007ffef0aa124c R14: 00007ffef0aa1260 R15: 00007ffef0aa1250 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__list_add_valid_or_report+0xb6/0x100 lib/list_debug.c:32 Code: e8 2f a5 3a fd 0f 0b 48 89 d9 48 c7 c7 40 9d e9 8a e8 1e a5 3a fd 0f 0b 48 89 f1 48 c7 c7 c0 9d e9 8a 48 89 de e8 0a a5 3a fd <0f> 0b 48 89 f2 48 89 d9 48 89 ee 48 c7 c7 40 9e e9 8a e8 f3 a4 3a RSP: 0018:ffffc90009b3f898 EFLAGS: 00010286 RAX: 0000000000000075 RBX: ffff88814a1325e8 RCX: ffffffff816bb8d9 RDX: 0000000000000000 RSI: ffffffff816c4d42 RDI: 0000000000000005 RBP: ffff88807c7a9048 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000000 R11: 0000000000000001 R12: ffff88814a132000 R13: ffffc90009b3f900 R14: ffff888078d21048 R15: ffff88807c7a9048 FS: 0000555556c00380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffef0aa1138 CR3: 000000007d17e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- 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@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection If the bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
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