#syz dup: WARNING: suspicious RCU usage in getname_flags On Fri, Apr 02, 2021 at 07:52:17PM -0700, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 1e43c377 Merge tag 'xtensa-20210329' of git://github.com/j.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=16d76301d00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=78ef1d159159890 > dashboard link: https://syzkaller.appspot.com/bug?extid=bdef67a6b28a89e6fe71 > > Unfortunately, I don't have any reproducer for this issue yet. > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+bdef67a6b28a89e6fe71@xxxxxxxxxxxxxxxxxxxxxxxxx > > ============================= > WARNING: suspicious RCU usage > 5.12.0-rc5-syzkaller #0 Not tainted > ----------------------------- > kernel/sched/core.c:8294 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 systemd-udevd/4825. > > stack backtrace: > CPU: 1 PID: 4825 Comm: systemd-udevd Not tainted 5.12.0-rc5-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:79 [inline] > dump_stack+0x141/0x1d7 lib/dump_stack.c:120 > ___might_sleep+0x229/0x2c0 kernel/sched/core.c:8294 > dput+0x4d/0xbc0 fs/dcache.c:870 > step_into+0x2cf/0x1c80 fs/namei.c:1778 > walk_component+0x171/0x6a0 fs/namei.c:1945 > link_path_walk.part.0+0x712/0xc90 fs/namei.c:2266 > link_path_walk fs/namei.c:2190 [inline] > path_lookupat+0xb7/0x830 fs/namei.c:2419 > filename_lookup+0x19f/0x560 fs/namei.c:2453 > do_readlinkat+0xcd/0x2f0 fs/stat.c:417 > __do_sys_readlinkat fs/stat.c:444 [inline] > __se_sys_readlinkat fs/stat.c:441 [inline] > __x64_sys_readlinkat+0x93/0xf0 fs/stat.c:441 > do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 > entry_SYSCALL_64_after_hwframe+0x44/0xae > RIP: 0033:0x7fb5a7e200ba > Code: 48 8b 0d e1 bd 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 0b 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d ae bd 2b 00 f7 d8 64 89 01 48 > RSP: 002b:00007ffc9c440e38 EFLAGS: 00000202 ORIG_RAX: 000000000000010b > RAX: ffffffffffffffda RBX: 00005604089e4380 RCX: 00007fb5a7e200ba > RDX: 00005604089e4380 RSI: 00007ffc9c440ec0 RDI: 00000000ffffff9c > RBP: 0000000000000064 R08: 00007fb5a80dcbc8 R09: 0000000000000070 > R10: 0000000000000063 R11: 0000000000000202 R12: 00007ffc9c440ec0 > R13: 00000000ffffff9c R14: 00007ffc9c440e90 R15: 0000000000000063 > > > --- > This report is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
