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<0000000000007c85f5060dcc3a28@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000034ef50060e1d3bee@google.com> Subject: Re: [syzbot] Re: [syzbot] [net?] general protection fault in qdisc_create From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com. *** Subject: Re: [syzbot] [net?] general protection fault in qdisc_create Author: jiri@resnulli.us Sun, Dec 31, 2023 at 12:04:25PM CET, syzbot+84339b9e7330daae4d66@syzkaller.appspotmail.com wrote: >Hello, > >syzbot found the following issue on: > >HEAD commit: c2b2ee36250d bridge: cfm: fix enum typo in br_cc_ccm_tx_pa.. >git tree: net-next >console+strace: https://syzkaller.appspot.com/x/log.txt?x=15812036e80000 >kernel config: https://syzkaller.appspot.com/x/.config?x=a4e9ca8e3c104d2a >dashboard link: https://syzkaller.appspot.com/bug?extid=84339b9e7330daae4d66 >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=13535445e80000 >C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15fed8f6e80000 > >Downloadable assets: >disk image: https://storage.googleapis.com/syzbot-assets/7344dc892eab/disk-c2b2ee36.raw.xz >vmlinux: https://storage.googleapis.com/syzbot-assets/b5d04995c162/vmlinux-c2b2ee36.xz >kernel image: https://storage.googleapis.com/syzbot-assets/9558856ab7f4/bzImage-c2b2ee36.xz > >The issue was bisected to: > >commit 913b47d3424e7d99eaf34b798c47dfa840c64a08 >Author: Victor Nogueira >Date: Tue Dec 19 18:16:19 2023 +0000 > > net/sched: Introduce tc block netdev tracking infra > >bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11992409e80000 >final oops: https://syzkaller.appspot.com/x/report.txt?x=13992409e80000 >console output: https://syzkaller.appspot.com/x/log.txt?x=15992409e80000 > >IMPORTANT: if you fix the issue, please add the following tag to the commit: >Reported-by: syzbot+84339b9e7330daae4d66@syzkaller.appspotmail.com >Fixes: 913b47d3424e ("net/sched: Introduce tc block netdev tracking infra") > >general protection fault, probably for non-canonical address 0xdffffc0000000009: 0000 [#1] PREEMPT SMP KASAN >KASAN: null-ptr-deref in range [0x0000000000000048-0x000000000000004f] >CPU: 1 PID: 5061 Comm: syz-executor323 Not tainted 6.7.0-rc6-syzkaller-01658-gc2b2ee36250d #0 >Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 >RIP: 0010:qdisc_block_add_dev net/sched/sch_api.c:1190 [inline] >RIP: 0010:qdisc_create+0x69e/0x1430 net/sched/sch_api.c:1390 >Code: ea 03 80 3c 02 00 0f 85 50 0c 00 00 4c 8b 6d 08 49 8d 45 48 48 89 c2 48 89 44 24 18 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 0f 0c 00 00 31 d2 be f2 ff 00 00 48 89 df 41 ff >RSP: 0018:ffffc9000398f420 EFLAGS: 00010206 >RAX: dffffc0000000000 RBX: ffff88802688c800 RCX: ffffffff888dbd56 >RDX: 0000000000000009 RSI: ffffffff888db6fe RDI: ffffffff8f19bde8 >RBP: ffffffff8f19bde0 R08: 0000000000000001 R09: 0000000000000000 >R10: 0000000000000001 R11: 0000000000000001 R12: ffff88804fd64000 >R13: 0000000000000000 R14: 0000000000000001 R15: ffffffff8f19bde0 >FS: 0000555556ef3380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 >CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >CR2: 0000000020001248 CR3: 0000000027f71000 CR4: 00000000003506f0 >DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 >DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 >Call Trace: > > tc_modify_qdisc+0x4d5/0x1c30 net/sched/sch_api.c:1788 > rtnetlink_rcv_msg+0x3c7/0xe00 net/core/rtnetlink.c:6615 > netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2543 > netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline] > netlink_unicast+0x53b/0x810 net/netlink/af_netlink.c:1367 > netlink_sendmsg+0x8b7/0xd70 net/netlink/af_netlink.c:1908 > sock_sendmsg_nosec net/socket.c:730 [inline] > __sock_sendmsg+0xd5/0x180 net/socket.c:745 > ____sys_sendmsg+0x6ac/0x940 net/socket.c:2584 > ___sys_sendmsg+0x135/0x1d0 net/socket.c:2638 > __sys_sendmsg+0x117/0x1e0 net/socket.c:2667 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x63/0x6b >RIP: 0033:0x7f9733a8a8b9 >Code: 48 83 c4 28 c3 e8 27 18 00 00 0f 1f 80 00 00 00 00 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:00007ffd50d7c048 EFLAGS: 00000246 ORIG_RAX: 000000000000002e >RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9733a8a8b9 >RDX: 0000000000000000 RSI: 0000000020005840 RDI: 0000000000000003 >RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffd50d7c0c0 >R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 >R13: 00007ffd50d7c248 R14: 0000000000000001 R15: 0000000000000001 > >Modules linked in: >---[ end trace 0000000000000000 ]--- >RIP: 0010:qdisc_block_add_dev net/sched/sch_api.c:1190 [inline] >RIP: 0010:qdisc_create+0x69e/0x1430 net/sched/sch_api.c:1390 >Code: ea 03 80 3c 02 00 0f 85 50 0c 00 00 4c 8b 6d 08 49 8d 45 48 48 89 c2 48 89 44 24 18 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 0f 0c 00 00 31 d2 be f2 ff 00 00 48 89 df 41 ff >RSP: 0018:ffffc9000398f420 EFLAGS: 00010206 >RAX: dffffc0000000000 RBX: ffff88802688c800 RCX: ffffffff888dbd56 >RDX: 0000000000000009 RSI: ffffffff888db6fe RDI: ffffffff8f19bde8 >RBP: ffffffff8f19bde0 R08: 0000000000000001 R09: 0000000000000000 >R10: 0000000000000001 R11: 0000000000000001 R12: ffff88804fd64000 >R13: 0000000000000000 R14: 0000000000000001 R15: ffffffff8f19bde0 >FS: 0000555556ef3380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 >CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >CR2: 0000000020001248 CR3: 0000000027f71000 CR4: 00000000003506f0 >DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 >DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 >---------------- >Code disassembly (best guess), 1 bytes skipped: > 0: 03 80 3c 02 00 0f add 0xf00023c(%rax),%eax > 6: 85 50 0c test %edx,0xc(%rax) > 9: 00 00 add %al,(%rax) > b: 4c 8b 6d 08 mov 0x8(%rbp),%r13 > f: 49 8d 45 48 lea 0x48(%r13),%rax > 13: 48 89 c2 mov %rax,%rdx > 16: 48 89 44 24 18 mov %rax,0x18(%rsp) > 1b: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax > 22: fc ff df > 25: 48 c1 ea 03 shr $0x3,%rdx >* 29: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction > 2d: 0f 85 0f 0c 00 00 jne 0xc42 > 33: 31 d2 xor %edx,%edx > 35: be f2 ff 00 00 mov $0xfff2,%esi > 3a: 48 89 df mov %rbx,%rdi > 3d: 41 rex.B > 3e: ff .byte 0xff > > >--- >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. >For information about bisection process see: https://goo.gl/tpsmEJ#bisection > >If the report is already addressed, 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 #syz test: https://github.com/jpirko/linux_mlxsw.git wip_tc_block_fix