syzbot


WARNING: suspicious RCU usage in get_counters

Status: auto-closed as invalid on 2021/03/25 10:51
Subsystems: netfilter
[Documentation on labels]
Reported-by: syzbot+5cfc290df4bbf069bc65@syzkaller.appspotmail.com
First crash: 1184d, last: 1184d
Discussions (1)
Title Replies (including bot) Last reply
WARNING: suspicious RCU usage in get_counters 0 (1) 2020/11/29 10:58
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING: suspicious RCU usage in get_counters (2) netfilter 1 970d 970d 20/26 fixed on 2021/11/10 00:50

Sample crash report:
=============================
WARNING: suspicious RCU usage
5.10.0-rc5-syzkaller #0 Not tainted
-----------------------------
kernel/sched/core.c:7270 Illegal context switch in RCU-sched read-side critical section!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 0
1 lock held by syz-executor.3/10331:
 #0: ffff8880459f8308 (&xt[i].mutex){+.+.}-{3:3}, at: xt_find_table_lock+0x41/0x540 net/netfilter/x_tables.c:1206

stack backtrace:
CPU: 3 PID: 10331 Comm: syz-executor.3 Not tainted 5.10.0-rc5-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:118
 ___might_sleep+0x25d/0x2b0 kernel/sched/core.c:7270
 get_counters+0x2f5/0x520 net/ipv4/netfilter/ip_tables.c:765
 do_ipt_get_ctl+0x634/0x9d0 net/ipv4/netfilter/ip_tables.c:805
 nf_getsockopt+0x72/0xd0 net/netfilter/nf_sockopt.c:116
 ip_getsockopt net/ipv4/ip_sockglue.c:1777 [inline]
 ip_getsockopt+0x164/0x1c0 net/ipv4/ip_sockglue.c:1756
 tcp_getsockopt+0x86/0xd0 net/ipv4/tcp.c:3882
 __sys_getsockopt+0x219/0x4c0 net/socket.c:2173
 __do_sys_getsockopt net/socket.c:2188 [inline]
 __se_sys_getsockopt net/socket.c:2185 [inline]
 __x64_sys_getsockopt+0xba/0x150 net/socket.c:2185
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45ec3a
Code: b8 34 01 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 cd 9f fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 aa 9f fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007ffccbec9f78 EFLAGS: 00000212 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 00007ffccbec9fb0 RCX: 000000000045ec3a
RDX: 0000000000000041 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000734000 R08: 00007ffccbec9fac R09: 0000000000004000
R10: 00007ffccbeca010 R11: 0000000000000212 R12: 00007ffccbeca010
R13: 0000000000000003 R14: 0000000000732bc0 R15: 0000000000000000

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/11/25 10:50 upstream 127c501a03d5 1a1f4bd8 .config console log report info ci-qemu-upstream
* Struck through repros no longer work on HEAD.