bisecting fixing commit since 811218eceeaa7618652e1b8d11caeff67ab42072
building syzkaller on 98682e5e2aefc9aad61354f4f3ac93be96002a2a
testing commit 811218eceeaa7618652e1b8d11caeff67ab42072 with gcc (GCC) 8.4.1 20210217
kernel signature: 0c78f15054564b8c0147b1bded4e0d2e6c3ff9e2e56d3a37eec98023a7e9fec5
all runs: crashed: general protection fault in fq_codel_enqueue
testing current HEAD 2965db2e004cf9c92b87c1f559e9812c0ae878c1
testing commit 2965db2e004cf9c92b87c1f559e9812c0ae878c1 with gcc (GCC) 8.4.1 20210217
kernel signature: 8e980a54f3a948445e533168d8ea00d8f9571cdf1cdc4ac8e305bc6d1b1ac060
all runs: crashed: general protection fault in fq_codel_enqueue
revisions tested: 2, total time: 21m40.401738407s (build: 14m38.576315005s, test: 6m41.568860667s)
the crash still happens on HEAD
commit msg: Linux 4.19.188
crash: general protection fault in fq_codel_enqueue
Bluetooth: hci0: command 0x0419 tx timeout
kasan: CONFIG_KASAN_INLINE enabled
IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready
kasan: GPF could be caused by NULL-ptr deref or user memory access
Bluetooth: hci1: command 0x0419 tx timeout
general protection fault: 0000 [#1] PREEMPT SMP KASAN
wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
CPU: 1 PID: 9863 Comm: syz-executor.2 Not tainted 4.19.188-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:126 [inline]
RIP: 0010:fq_codel_drop net/sched/sch_fq_codel.c:174 [inline]
RIP: 0010:fq_codel_enqueue+0x865/0x12e0 net/sched/sch_fq_codel.c:236
Code: 48 89 7c 24 48 eb 0b 44 39 7c 24 58 0f 86 bb 00 00 00 48 8b 7c 24 50 80 3f 00 0f 85 82 06 00 00 4c 8b 20 4c 89 e2 48 c1 ea 03 <80> 3c 0a 00 0f 85 64 05 00 00 49 8b 14 24 49 8d 7c 24 28 48 89 10
RSP: 0018:ffff88809c577540 EFLAGS: 00010246
RAX: ffff8880917e08c0 RBX: ffff8880ae86a000 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffed10122fc118
RBP: ffff88809c577630 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: ffff8880ae86a2e8 R12: 0000000000000000
R13: 1ffff110138aeeb4 R14: ffff88809c577780 R15: 0000000000000000
FS:  00007fba86ddf700(0000) GS:ffff8880ba300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f244ef36000 CR3: 0000000099765000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
 __dev_xmit_skb net/core/dev.c:3494 [inline]
 __dev_queue_xmit+0x1098/0x2900 net/core/dev.c:3807
IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
 dev_queue_xmit+0xb/0x10 net/core/dev.c:3871
 __bpf_tx_skb net/core/filter.c:2015 [inline]
 __bpf_redirect_common net/core/filter.c:2054 [inline]
 __bpf_redirect+0x619/0xb60 net/core/filter.c:2061
 ____bpf_clone_redirect net/core/filter.c:2094 [inline]
 bpf_clone_redirect+0x29b/0x3f0 net/core/filter.c:2066
 bpf_prog_cc75667d52cf7bb0+0x71b/0x1000
 bpf_test_run_one net/bpf/test_run.c:22 [inline]
 bpf_test_run+0xce/0x330 net/bpf/test_run.c:43
 bpf_prog_test_run_skb+0x537/0xa90 net/bpf/test_run.c:147
 bpf_prog_test_run kernel/bpf/syscall.c:1791 [inline]
 __do_sys_bpf kernel/bpf/syscall.c:2436 [inline]
 __se_sys_bpf+0x9af/0x2bf0 kernel/bpf/syscall.c:2379
 __x64_sys_bpf+0x6e/0xb0 kernel/bpf/syscall.c:2379
 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x465d99
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:00007fba86ddf188 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465d99
RDX: 0000000000000048 RSI: 0000000020000140 RDI: 000000000000000a
RBP: 00000000004bcf27 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffd0b5c67df R14: 00007fba86ddf300 R15: 0000000000022000
Modules linked in:
---[ end trace cf8e6aedfcd895a4 ]---
RIP: 0010:dequeue_head net/sched/sch_fq_codel.c:126 [inline]
RIP: 0010:fq_codel_drop net/sched/sch_fq_codel.c:174 [inline]
RIP: 0010:fq_codel_enqueue+0x865/0x12e0 net/sched/sch_fq_codel.c:236
Code: 48 89 7c 24 48 eb 0b 44 39 7c 24 58 0f 86 bb 00 00 00 48 8b 7c 24 50 80 3f 00 0f 85 82 06 00 00 4c 8b 20 4c 89 e2 48 c1 ea 03 <80> 3c 0a 00 0f 85 64 05 00 00 49 8b 14 24 49 8d 7c 24 28 48 89 10
RSP: 0018:ffff88809c577540 EFLAGS: 00010246
RAX: ffff8880917e08c0 RBX: ffff8880ae86a000 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffed10122fc118
RBP: ffff88809c577630 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: ffff8880ae86a2e8 R12: 0000000000000000
R13: 1ffff110138aeeb4 R14: ffff88809c577780 R15: 0000000000000000
FS:  00007fba86ddf700(0000) GS:ffff8880ba300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f244ef36000 CR3: 0000000099765000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400