bisecting fixing commit since f6d5cb9e2c06f7d583dd9f4f7cca21d13d78c32a
building syzkaller on d5a3ae1f760e7cb2cd5a721d9645ae22eae114fe
testing commit f6d5cb9e2c06f7d583dd9f4f7cca21d13d78c32a with gcc (GCC) 8.1.0
kernel signature: c94b7e3bec3d6a2ed46b4b2b7cae47413e5562eccec43818b4c2d7415834863a
all runs: crashed: general protection fault in fq_codel_enqueue
testing current HEAD 10ad6cfd57360760116cde00a8ef756e121367a9
testing commit 10ad6cfd57360760116cde00a8ef756e121367a9 with gcc (GCC) 8.1.0
kernel signature: bbbb8964e3603a12e64a49492601c5fba441037f1c011efa0f415e1fc5f75fd2
all runs: crashed: general protection fault in fq_codel_enqueue
revisions tested: 2, total time: 25m12.207019052s (build: 18m27.895487865s, test: 6m1.190363275s)
the crash still happens on HEAD
commit msg: Linux 4.19.148
crash: general protection fault in fq_codel_enqueue
batman_adv: batadv0: Interface activated: batadv_slave_1
IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 8045 Comm: syz-executor.3 Not tainted 4.19.148-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+0x863/0x12e0 net/sched/sch_fq_codel.c:236
Code: 3c 0a 48 89 7c 24 48 eb 09 44 39 c2 0f 83 bd 00 00 00 48 8b 7c 24 50 80 3f 00 0f 85 84 06 00 00 4c 8b 20 4c 89 e2 48 c1 ea 03 <80> 3c 0a 00 0f 85 66 05 00 00 49 8b 14 24 49 8d 7c 24 28 48 89 10
RSP: 0018:ffff8880a510f560 EFLAGS: 00010246
RAX: ffff888082720d80 RBX: ffff8880a572edc0 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffed10104e41b0
RBP: ffff8880a510f650 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: ffff8880a572f0a8 R12: 0000000000000000
R13: 1ffff11014a21eb8 R14: ffff8880a510f7a0 R15: 0000000000000000
FS:  00007fe6c3008700(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe6c2fe7d90 CR3: 000000008a16d000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __dev_xmit_skb net/core/dev.c:3494 [inline]
 __dev_queue_xmit+0x1098/0x2900 net/core/dev.c:3807
 dev_queue_xmit+0xb/0x10 net/core/dev.c:3871
 __netlink_deliver_tap_skb net/netlink/af_netlink.c:303 [inline]
 __netlink_deliver_tap net/netlink/af_netlink.c:321 [inline]
 netlink_deliver_tap+0x77e/0xb00 net/netlink/af_netlink.c:334
 netlink_deliver_tap_kernel net/netlink/af_netlink.c:343 [inline]
 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline]
 netlink_unicast+0x412/0x660 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x666/0xc50 net/netlink/af_netlink.c:1909
 sock_sendmsg_nosec net/socket.c:622 [inline]
 sock_sendmsg+0xac/0xf0 net/socket.c:632
 ___sys_sendmsg+0x647/0x950 net/socket.c:2115
 __sys_sendmsg+0xd9/0x180 net/socket.c:2153
 __do_sys_sendmsg net/socket.c:2162 [inline]
 __se_sys_sendmsg net/socket.c:2160 [inline]
 __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2160
 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45d5b9
Code: 5d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fe6c3007c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000002a1c0 RCX: 000000000045d5b9
RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003
RBP: 000000000118cf80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c
R13: 00007ffde25dcdef R14: 00007fe6c30089c0 R15: 000000000118cf4c
Modules linked in:
---[ end trace 8e430ff0466e5fe0 ]---
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+0x863/0x12e0 net/sched/sch_fq_codel.c:236
Code: 3c 0a 48 89 7c 24 48 eb 09 44 39 c2 0f 83 bd 00 00 00 48 8b 7c 24 50 80 3f 00 0f 85 84 06 00 00 4c 8b 20 4c 89 e2 48 c1 ea 03 <80> 3c 0a 00 0f 85 66 05 00 00 49 8b 14 24 49 8d 7c 24 28 48 89 10
RSP: 0018:ffff8880a510f560 EFLAGS: 00010246
RAX: ffff888082720d80 RBX: ffff8880a572edc0 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffed10104e41b0
RBP: ffff8880a510f650 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: ffff8880a572f0a8 R12: 0000000000000000
R13: 1ffff11014a21eb8 R14: ffff8880a510f7a0 R15: 0000000000000000
FS:  00007fe6c3008700(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe6c2fe7d90 CR3: 000000008a16d000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400