bisecting fixing commit since b8776f14a47046796fe078c4a2e691f58e00ae06
building syzkaller on 2bd9619f762176527aaf28fb26e4a08b614b55df
testing commit b8776f14a47046796fe078c4a2e691f58e00ae06 with gcc (GCC) 10.2.1 20210217
kernel signature: b9f2b6414b55439f6ea6cd7a9df45e3d6f4908d197173aa2e48d08010fabdc8c
all runs: crashed: general protection fault in fq_codel_enqueue
testing current HEAD 6477dd39e62c3a67cfa368ddc127410b4ae424c6
testing commit 6477dd39e62c3a67cfa368ddc127410b4ae424c6 with gcc (GCC) 10.2.1 20210217
kernel signature: 9eee7fbddf1cb41a8173b42d607e151fcd5842ae08fbca31beb730e0846a50ec
all runs: crashed: general protection fault in fq_codel_enqueue
revisions tested: 2, total time: 21m4.673951593s (build: 13m24.624273666s, test: 6m55.4663485s)
the crash still happens on HEAD
commit msg: mptcp: Retransmit DATA_FIN
crash: general protection fault in fq_codel_enqueue
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: 10187 Comm: syz-executor.4 Not tainted 5.12.0-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+0x727/0x1020 net/sched/sch_fq_codel.c:230
Code: f9 49 89 d2 49 c1 ea 03 4d 01 fa eb 09 44 39 e5 0f 86 ab 00 00 00 41 80 3a 00 0f 85 1e 06 00 00 48 8b 1a 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 0f 85 c4 05 00 00 48 8b 03 48 8d 7b 28 48 89 02 48
RSP: 0018:ffffc900017bf600 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88803f150000 RSI: 0000000000000000 RDI: ffff888022aa32e8
RBP: 0000000000000040 R08: 0000000000000000 R09: fffff520002f7ef4
R10: ffffed1007e2a000 R11: 0000000000000001 R12: 0000000000000000
R13: ffffc900017bf7a0 R14: 0000000000000000 R15: dffffc0000000000
FS:  00007f1c318aa700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffdae7f7850 CR3: 000000002475a000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __dev_xmit_skb net/core/dev.c:3849 [inline]
 __dev_queue_xmit+0x13ab/0x26a0 net/core/dev.c:4162
 __bpf_tx_skb net/core/filter.c:2116 [inline]
 __bpf_redirect_no_mac net/core/filter.c:2141 [inline]
 __bpf_redirect+0x463/0xb90 net/core/filter.c:2164
 ____bpf_clone_redirect net/core/filter.c:2448 [inline]
 bpf_clone_redirect+0x275/0x3f0 net/core/filter.c:2420
 bpf_prog_cc75667d52cf7bb0+0x56/0x2c8
 bpf_dispatcher_nop_func include/linux/bpf.h:661 [inline]
 bpf_test_run+0x310/0xa90 net/bpf/test_run.c:50
 bpf_prog_test_run_skb+0x964/0x1b40 net/bpf/test_run.c:582
 bpf_prog_test_run kernel/bpf/syscall.c:3132 [inline]
 __do_sys_bpf+0x1030/0x39e0 kernel/bpf/syscall.c:4411
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x465b09
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1c318aa188 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000465b09
RDX: 0000000000000048 RSI: 0000000020000140 RDI: 000000000000000a
RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c008
R13: 00007ffcc5d4e50f R14: 00007f1c318aa300 R15: 0000000000022000
Modules linked in:
---[ end trace 0dfd45fa81b02097 ]---
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+0x727/0x1020 net/sched/sch_fq_codel.c:230
Code: f9 49 89 d2 49 c1 ea 03 4d 01 fa eb 09 44 39 e5 0f 86 ab 00 00 00 41 80 3a 00 0f 85 1e 06 00 00 48 8b 1a 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 0f 85 c4 05 00 00 48 8b 03 48 8d 7b 28 48 89 02 48
RSP: 0018:ffffc900017bf600 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88803f150000 RSI: 0000000000000000 RDI: ffff888022aa32e8
RBP: 0000000000000040 R08: 0000000000000000 R09: fffff520002f7ef4
R10: ffffed1007e2a000 R11: 0000000000000001 R12: 0000000000000000
R13: ffffc900017bf7a0 R14: 0000000000000000 R15: dffffc0000000000
FS:  00007f1c318aa700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffdae7f7850 CR3: 000000002475a000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400