Hello, syzbot found the following issue on: HEAD commit: 82821be8 Merge tag 'arm64-fixes' of git://git.kernel.org/p.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14a3da20d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=70f222f8a2ffcbde dashboard link: https://syzkaller.appspot.com/bug?extid=37978b81dea56c7a4249 compiler: gcc (GCC) 10.1.0-syz 20200507 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+37978b81dea56c7a4249@xxxxxxxxxxxxxxxxxxxxxxxxx ============================= WARNING: suspicious RCU usage 5.11.0-rc3-syzkaller #0 Not tainted ----------------------------- kernel/sched/core.c:7867 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 1 lock held by kworker/u17:3/10446: #0: ffff888014f94c00 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: prepare_bprm_creds fs/exec.c:1462 [inline] #0: ffff888014f94c00 (&sig->cred_guard_mutex){+.+.}-{3:3}, at: bprm_execve+0xb2/0x19a0 fs/exec.c:1794 stack backtrace: CPU: 1 PID: 10446 Comm: kworker/u17:3 Not tainted 5.11.0-rc3-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:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 ___might_sleep+0x229/0x2c0 kernel/sched/core.c:7867 __inode_security_revalidate security/selinux/hooks.c:259 [inline] inode_security+0x5d/0x130 security/selinux/hooks.c:296 selinux_file_permission+0x140/0x520 security/selinux/hooks.c:3549 security_file_permission+0x56/0x560 security/security.c:1448 rw_verify_area+0x115/0x350 fs/read_write.c:400 kernel_read+0x2a/0x70 fs/read_write.c:469 prepare_binprm fs/exec.c:1646 [inline] search_binary_handler fs/exec.c:1700 [inline] exec_binprm fs/exec.c:1757 [inline] bprm_execve fs/exec.c:1826 [inline] bprm_execve+0x740/0x19a0 fs/exec.c:1788 kernel_execve+0x370/0x460 fs/exec.c:1969 call_usermodehelper_exec_async+0x2de/0x580 kernel/umh.c:110 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 --- 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.
