syzbot


WARNING: suspicious RCU usage in count

Status: auto-closed as invalid on 2021/04/11 19:33
Reported-by: syzbot+51ce7a5794c3b12a70d1@syzkaller.appspotmail.com
First crash: 614d, last: 614d
similar bugs (1):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING: suspicious RCU usage in count (2) 1 455d 455d 22/23 fixed on 2021/11/10 00:50

Sample crash report:
=============================
WARNING: suspicious RCU usage
5.10.0-rc7-syzkaller #0 Not tainted
-----------------------------
kernel/sched/core.c:7270 Illegal context switch in RCU-bh read-side critical section!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 0
no locks held by udevd/9038.

stack backtrace:
CPU: 3 PID: 9038 Comm: udevd Not tainted 5.10.0-rc7-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+0x220/0x2b0 kernel/sched/core.c:7270
 count.constprop.0+0x164/0x270 fs/exec.c:449
 do_execveat_common+0x2fd/0x7c0 fs/exec.c:1893
 do_execve fs/exec.c:1983 [inline]
 __do_sys_execve fs/exec.c:2059 [inline]
 __se_sys_execve fs/exec.c:2054 [inline]
 __x64_sys_execve+0x8f/0xc0 fs/exec.c:2054
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7fbc6f64c207
Code: 77 19 f4 48 89 d7 44 89 c0 0f 05 48 3d 00 f0 ff ff 76 e0 f7 d8 64 41 89 01 eb d8 f7 d8 64 41 89 01 eb df b8 3b 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 02 f3 c3 48 8b 15 00 8c 2d 00 f7 d8 64 89 02
RSP: 002b:00007ffcfe4966d8 EFLAGS: 00000206
 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00007fbc6f64c207
RDX: 0000000000f1dfd0 RSI: 00007ffcfe4967d0 RDI: 00007ffcfe4977e0
RBP: 0000000000625500 R08: 00000000000022fb R09: 00000000000022fb
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000f1dfd0
R13: 0000000000000007 R14: 0000000000f0e250 R15: 0000000000000005

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-qemu-upstream-386 2020/12/12 19:32 upstream 7f376f1917d7 bca53db9 .config log report info