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<000000000000c3a2af05cf7fda31@google.com> Subject: [syzbot] general protection fault in fq_codel_enqueue (3) From: syzbot To: davem@davemloft.net, jhs@mojatatu.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, xiyou.wangcong@gmail.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: 1fc596a56b33 Merge tag 'trace-v5.15-rc6' of git://git.kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1453dc04b00000 kernel config: https://syzkaller.appspot.com/x/.config?x=b160d0631c7a8f26 dashboard link: https://syzkaller.appspot.com/bug?extid=7a12909485b94426aceb compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=154a0b64b00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=177eec86b00000 Bisection is inconclusive: the issue happens on the oldest tested release. bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=154fc86ab00000 final oops: https://syzkaller.appspot.com/x/report.txt?x=174fc86ab00000 console output: https://syzkaller.appspot.com/x/log.txt?x=134fc86ab00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+7a12909485b94426aceb@syzkaller.appspotmail.com general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 PID: 6542 Comm: syz-executor965 Not tainted 5.15.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:dequeue_head net/sched/sch_fq_codel.c:120 [inline] RIP: 0010:fq_codel_drop net/sched/sch_fq_codel.c:168 [inline] RIP: 0010:fq_codel_enqueue+0x83e/0x10c0 net/sched/sch_fq_codel.c:230 Code: f8 e2 25 fa 45 39 ec 0f 83 cb 00 00 00 e8 1a dc 25 fa 48 8b 44 24 10 80 38 00 0f 85 9a 06 00 00 49 8b 07 48 89 c2 48 c1 ea 03 <42> 80 3c 32 00 0f 85 6e 06 00 00 48 8b 10 48 8d 78 28 49 89 17 48 RSP: 0018:ffffc90001187310 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff87504776 RDI: 0000000000000003 RBP: ffffc900011874e0 R08: 0000000000000400 R09: 0000000000000001 R10: ffffffff875046d6 R11: 0000000000000000 R12: 0000000000000400 R13: 0000000000000000 R14: dffffc0000000000 R15: ffff888071660000 FS: 0000555556b21300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9c09885040 CR3: 0000000021c77000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: dev_qdisc_enqueue+0x40/0x300 net/core/dev.c:3771 __dev_xmit_skb net/core/dev.c:3855 [inline] __dev_queue_xmit+0x1f0e/0x36e0 net/core/dev.c:4170 __bpf_tx_skb net/core/filter.c:2114 [inline] __bpf_redirect_no_mac net/core/filter.c:2139 [inline] __bpf_redirect+0x5ba/0xd20 net/core/filter.c:2162 ____bpf_clone_redirect net/core/filter.c:2429 [inline] bpf_clone_redirect+0x2ae/0x420 net/core/filter.c:2401 ___bpf_prog_run+0x3592/0x77d0 kernel/bpf/core.c:1548 __bpf_prog_run512+0x91/0xd0 kernel/bpf/core.c:1776 bpf_dispatcher_nop_func include/linux/bpf.h:718 [inline] __bpf_prog_run include/linux/filter.h:624 [inline] bpf_prog_run include/linux/filter.h:631 [inline] bpf_test_run+0x37c/0xa20 net/bpf/test_run.c:119 bpf_prog_test_run_skb+0xa7c/0x1cb0 net/bpf/test_run.c:662 bpf_prog_test_run kernel/bpf/syscall.c:3307 [inline] __sys_bpf+0x2137/0x5df0 kernel/bpf/syscall.c:4605 __do_sys_bpf kernel/bpf/syscall.c:4691 [inline] __se_sys_bpf kernel/bpf/syscall.c:4689 [inline] __x64_sys_bpf+0x75/0xb0 kernel/bpf/syscall.c:4689 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fef7c1e24d9 Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc95c98158 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fef7c1e24d9 RDX: 0000000000000048 RSI: 0000000020000140 RDI: 000000000000000a RBP: 00007fef7c1a64c0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fef7c1a6550 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace 0597f54336b28fa4 ]--- RIP: 0010:dequeue_head net/sched/sch_fq_codel.c:120 [inline] RIP: 0010:fq_codel_drop net/sched/sch_fq_codel.c:168 [inline] RIP: 0010:fq_codel_enqueue+0x83e/0x10c0 net/sched/sch_fq_codel.c:230 Code: f8 e2 25 fa 45 39 ec 0f 83 cb 00 00 00 e8 1a dc 25 fa 48 8b 44 24 10 80 38 00 0f 85 9a 06 00 00 49 8b 07 48 89 c2 48 c1 ea 03 <42> 80 3c 32 00 0f 85 6e 06 00 00 48 8b 10 48 8d 78 28 49 89 17 48 RSP: 0018:ffffc90001187310 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff87504776 RDI: 0000000000000003 RBP: ffffc900011874e0 R08: 0000000000000400 R09: 0000000000000001 R10: ffffffff875046d6 R11: 0000000000000000 R12: 0000000000000400 R13: 0000000000000000 R14: dffffc0000000000 R15: ffff888071660000 FS: 0000555556b21300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9c09885040 CR3: 0000000021c77000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: f8 clc 1: e2 25 loop 0x28 3: fa cli 4: 45 39 ec cmp %r13d,%r12d 7: 0f 83 cb 00 00 00 jae 0xd8 d: e8 1a dc 25 fa callq 0xfa25dc2c 12: 48 8b 44 24 10 mov 0x10(%rsp),%rax 17: 80 38 00 cmpb $0x0,(%rax) 1a: 0f 85 9a 06 00 00 jne 0x6ba 20: 49 8b 07 mov (%r15),%rax 23: 48 89 c2 mov %rax,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 42 80 3c 32 00 cmpb $0x0,(%rdx,%r14,1) <-- trapping instruction 2f: 0f 85 6e 06 00 00 jne 0x6a3 35: 48 8b 10 mov (%rax),%rdx 38: 48 8d 78 28 lea 0x28(%rax),%rdi 3c: 49 89 17 mov %rdx,(%r15) 3f: 48 rex.W --- 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 syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches