syzbot


WARNING in cbq_destroy_class

Status: fixed on 2020/02/23 20:58
Reported-by: syzbot+eb72a2e94c3d00901d39@syzkaller.appspotmail.com
Fix commit: 9f7a32834b62 net_sched: fix ops->bind_class() implementations
First crash: 1637d, last: 1637d
Fix bisection: fixed by (bisect log) :
commit 9f7a32834b624bdfc94a21f3035463310faf7259
Author: Cong Wang <xiyou.wangcong@gmail.com>
Date: Fri Jan 24 00:26:18 2020 +0000

  net_sched: fix ops->bind_class() implementations

  
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in cbq_destroy_class net C done 7 1616d 1639d 15/27 fixed on 2020/02/18 14:31
linux-4.14 WARNING in cbq_destroy_class C inconclusive 1 1516d 1636d 0/1 upstream: reported C repro on 2020/01/24 21:03

Sample crash report:
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=8204 comm=syz-executor212
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=8204 comm=syz-executor212
netlink: 96 bytes leftover after parsing attributes in process `syz-executor212'.
------------[ cut here ]------------
WARNING: CPU: 0 PID: 8207 at net/sched/sch_cbq.c:1439 cbq_destroy_class.cold+0x11/0x18 net/sched/sch_cbq.c:1439
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 8207 Comm: syz-executor212 Not tainted 4.19.98-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x197/0x210 lib/dump_stack.c:118
 panic+0x26a/0x50e kernel/panic.c:186
 __warn.cold+0x20/0x53 kernel/panic.c:541
 report_bug+0x263/0x2b0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 fixup_bug arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x204/0x360 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1037
RIP: 0010:cbq_destroy_class.cold+0x11/0x18 net/sched/sch_cbq.c:1439
Code: c0 fb e9 82 fe ff ff 4c 89 f7 e8 7a 9e c0 fb e9 26 ff ff ff e9 76 02 00 00 e8 4b 04 89 fb 48 c7 c7 a0 9a 4d 88 e8 d3 67 73 fb <0f> 0b e9 90 59 ff ff 4c 8d 6b 68 e8 2f 04 89 fb 48 89 d8 48 c1 e8
RSP: 0018:ffff888093dd7178 EFLAGS: 00010282
RAX: 0000000000000024 RBX: ffff88808ed2cdc0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff81558b76 RDI: ffffed10127bae21
RBP: ffff888093dd7190 R08: 0000000000000024 R09: ffffed1015d05079
R10: ffffed1015d05078 R11: ffff8880ae8283c7 R12: ffff88808ed2d0a0
R13: 0000000000000001 R14: 0000000000000000 R15: ffff88808ed2d0a0
 cbq_destroy net/sched/sch_cbq.c:1473 [inline]
 cbq_destroy+0x208/0x2c0 net/sched/sch_cbq.c:1449
 qdisc_destroy+0x18a/0x6b0 net/sched/sch_generic.c:982
 notify_and_destroy+0xa2/0xb0 net/sched/sch_api.c:924
 qdisc_graft+0x4f3/0x1030 net/sched/sch_api.c:991
 tc_modify_qdisc+0xcae/0x1bd3 net/sched/sch_api.c:1582
 rtnetlink_rcv_msg+0x463/0xb00 net/core/rtnetlink.c:4768
 netlink_rcv_skb+0x17d/0x460 net/netlink/af_netlink.c:2454
 rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:4786
 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline]
 netlink_unicast+0x53a/0x730 net/netlink/af_netlink.c:1343
 netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1908
 sock_sendmsg_nosec net/socket.c:622 [inline]
 sock_sendmsg+0xd7/0x130 net/socket.c:632
 kernel_sendmsg+0x44/0x50 net/socket.c:640
 sock_no_sendpage+0x116/0x150 net/core/sock.c:2642
 kernel_sendpage+0x92/0xf0 net/socket.c:3378
 sock_sendpage+0x8b/0xc0 net/socket.c:847
 pipe_to_sendpage+0x296/0x360 fs/splice.c:452
 splice_from_pipe_feed fs/splice.c:503 [inline]
 __splice_from_pipe+0x391/0x7d0 fs/splice.c:627
 splice_from_pipe+0x108/0x170 fs/splice.c:662
 generic_splice_sendpage+0x3c/0x50 fs/splice.c:833
 do_splice_from fs/splice.c:852 [inline]
 do_splice+0x642/0x1340 fs/splice.c:1154
 __do_sys_splice fs/splice.c:1428 [inline]
 __se_sys_splice fs/splice.c:1408 [inline]
 __x64_sys_splice+0x2c6/0x330 fs/splice.c:1408
 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x446e79
Code: e8 5c b3 02 00 48 83 c4 18 c3 0f 1f 80 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 0f 83 0b 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f15b795ed88 EFLAGS: 00000246 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 00000000006dcc98 RCX: 0000000000446e79
RDX: 0000000000000009 RSI: 0000000000000000 RDI: 0000000000000007
RBP: 00000000006dcc90 R08: 000000000004ffe0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc9c
R13: 00000000004aed8e R14: 54c6c2ff093a6d32 R15: 0000000000010000
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/01/23 22:32 linux-4.19.y d183c8e2647a 11ebf937 .config console log report syz C ci2-linux-4-19
* Struck through repros no longer work on HEAD.