On Tue, Apr 6, 2021 at 2:44 AM syzbot <syzbot+320a3bc8d80f478c37e4@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: 514e1150 net: x25: Queue received packets in the drivers i.. > git tree: net-next > console output: https://syzkaller.appspot.com/x/log.txt?x=112a8831d00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=7eff0f22b8563a5f > dashboard link: https://syzkaller.appspot.com/bug?extid=320a3bc8d80f478c37e4 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1532d711d00000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15f44c5ed00000 > > The issue was bisected to: > > commit 4dfe6bd94959222e18d512bdf15f6bf9edb9c27c > Author: Rustam Kovhaev <rkovhaev@xxxxxxxxx> > Date: Wed Feb 24 20:00:30 2021 +0000 > > ntfs: check for valid standard information attribute This is caused by one of my sockmap patches. > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=16207a81d00000 > final oops: https://syzkaller.appspot.com/x/report.txt?x=15207a81d00000 > console output: https://syzkaller.appspot.com/x/log.txt?x=11207a81d00000 > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+320a3bc8d80f478c37e4@xxxxxxxxxxxxxxxxxxxxxxxxx > Fixes: 4dfe6bd94959 ("ntfs: check for valid standard information attribute") > > ============================= > WARNING: suspicious RCU usage > 5.12.0-rc4-syzkaller #0 Not tainted > ----------------------------- > include/linux/skmsg.h:286 suspicious rcu_dereference_check() usage! > > other info that might help us debug this: > > > rcu_scheduler_active = 2, debug_locks = 1 > 1 lock held by syz-executor383/8454: > #0: ffff888013a99b48 (clock-AF_INET){++..}-{2:2}, at: sk_psock_drop+0x2c/0x460 net/core/skmsg.c:788 > > stack backtrace: > CPU: 1 PID: 8454 Comm: syz-executor383 Not tainted 5.12.0-rc4-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 > sk_psock include/linux/skmsg.h:286 [inline] > tcp_bpf_update_proto+0x530/0x5f0 net/ipv4/tcp_bpf.c:504 > sk_psock_restore_proto include/linux/skmsg.h:408 [inline] > sk_psock_drop+0xdf/0x460 net/core/skmsg.c:789 > sk_psock_put include/linux/skmsg.h:446 [inline] > tcp_bpf_recvmsg+0x42d/0x480 net/ipv4/tcp_bpf.c:208 > inet_recvmsg+0x11b/0x5d0 net/ipv4/af_inet.c:852 Oddly, I have all relevant Kconfig enabled but never see this warning when running selftests for hours.... Anyway, let me see how this should be fixed. Thanks!
