bisecting fixing commit since e7d2672c66e4d3675570369bf20856296da312c4
building syzkaller on a60cb4cd840ce786236a00480e8bb1025e0c5fef
testing commit e7d2672c66e4d3675570369bf20856296da312c4 with gcc (GCC) 8.1.0
kernel signature: 83125004c3c41169975437664b79270e882ced2dde8f21c32dcd713d3103da73
all runs: crashed: general protection fault in hrtimer_active
testing current HEAD 1bab61d3e8cd96f2badf515dcb06e4e1029bc017
testing commit 1bab61d3e8cd96f2badf515dcb06e4e1029bc017 with gcc (GCC) 8.1.0
kernel signature: b469b13a1d8c4f3b0b4c26d5b3b0b0ca2d648c9d53e3695072f66ef2e51384d9
all runs: crashed: general protection fault in cbs_destroy
revisions tested: 2, total time: 24m4.80927993s (build: 16m54.137497546s, test: 6m16.473268037s)
the crash still happens on HEAD
commit msg: Linux 4.19.124
crash: general protection fault in cbs_destroy
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f44dfb3f6d4
R13: 00000000004c77fb R14: 00000000004dd098 R15: 0000000000000006
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: 1 PID: 7259 Comm: syz-executor.5 Not tainted 4.19.124-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__list_del_entry_valid+0x84/0xf3 lib/list_debug.c:51
Code: 0f 84 cc 00 00 00 48 b8 00 02 00 00 00 00 ad de 49 39 c4 0f 84 a5 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 75 5f 49 8b 14 24 48 39 da 0f 85 ba 00 00 00 49 8d 7d
RSP: 0018:ffff888095ce7468 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff8880971990e0 RCX: ffffffff814ce630
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880971990e8
RBP: ffff888095ce7480 R08: fffffbfff115d7b5 R09: fffffbfff115d7b4
R10: fffffbfff115d7b4 R11: ffffffff88aebda3 R12: 0000000000000000
R13: 0000000000000000 R14: ffff888097199040 R15: ffff888088562180
FS:  00007f44dfb3f700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000095ccd000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __list_del_entry include/linux/list.h:117 [inline]
 list_del include/linux/list.h:125 [inline]
 cbs_destroy+0x7f/0x260 net/sched/sch_cbs.c:448
 qdisc_create+0x9ce/0xf60 net/sched/sch_api.c:1203
 tc_modify_qdisc+0x3f2/0x18f4 net/sched/sch_api.c:1571
 rtnetlink_rcv_msg+0x34f/0x8f0 net/core/rtnetlink.c:4777
 netlink_rcv_skb+0x142/0x390 net/netlink/af_netlink.c:2455
 rtnetlink_rcv+0x10/0x20 net/core/rtnetlink.c:4795
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x445/0x640 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x765/0xc50 net/netlink/af_netlink.c:1909
 sock_sendmsg_nosec net/socket.c:622 [inline]
 sock_sendmsg+0xb5/0xf0 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: 0033:0x4598e9
Code: fd b7 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f44dfb3ec78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f44dfb3ec90 RCX: 00000000004598e9
RDX: 0000000000000000 RSI: 0000000020000240 RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f44dfb3f6d4
R13: 00000000004c77fb R14: 00000000004dd098 R15: 0000000000000006
Modules linked in:
---[ end trace 4a1be2e7fbe8b7cf ]---
RIP: 0010:__list_del_entry_valid+0x84/0xf3 lib/list_debug.c:51
Code: 0f 84 cc 00 00 00 48 b8 00 02 00 00 00 00 ad de 49 39 c4 0f 84 a5 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 75 5f 49 8b 14 24 48 39 da 0f 85 ba 00 00 00 49 8d 7d
RSP: 0018:ffff888095ce7468 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff8880971990e0 RCX: ffffffff814ce630
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880971990e8
RBP: ffff888095ce7480 R08: fffffbfff115d7b5 R09: fffffbfff115d7b4
R10: fffffbfff115d7b4 R11: ffffffff88aebda3 R12: 0000000000000000
R13: 0000000000000000 R14: ffff888097199040 R15: ffff888088562180
FS:  00007f44dfb3f700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000095ccd000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400