can: request_module (can-proto-0) failed.
=============================
WARNING: suspicious RCU usage
4.14.307-syzkaller #0 Not tainted
-----------------------------
net/tipc/bearer.c:177 suspicious rcu_dereference_protected() usage!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
2 locks held by syz-executor.2/2709:
 #0:  (cb_lock){++++}, at: [<ffffffff85e3f495>] genl_rcv+0x15/0x40 net/netlink/genetlink.c:635
 #1:  (genl_mutex){+.+.}, at: [<ffffffff85e400f2>] genl_lock net/netlink/genetlink.c:33 [inline]
 #1:  (genl_mutex){+.+.}, at: [<ffffffff85e400f2>] genl_rcv_msg+0x112/0x140 net/netlink/genetlink.c:623

stack backtrace:
CPU: 0 PID: 2709 Comm: syz-executor.2 Not tainted 4.14.307-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 tipc_bearer_find+0x1ff/0x2f0 net/tipc/bearer.c:177
 tipc_nl_compat_link_set+0x40b/0xb90 net/tipc/netlink_compat.c:807
 __tipc_nl_compat_doit net/tipc/netlink_compat.c:316 [inline]
 tipc_nl_compat_doit+0x192/0x5d0 net/tipc/netlink_compat.c:364
 tipc_nl_compat_handle net/tipc/netlink_compat.c:1215 [inline]
 tipc_nl_compat_recv+0xa0b/0xae0 net/tipc/netlink_compat.c:1297
 genl_family_rcv_msg+0x572/0xb20 net/netlink/genetlink.c:600
 genl_rcv_msg+0xaf/0x140 net/netlink/genetlink.c:625
 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2461
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:636
 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
 netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1328
 netlink_sendmsg+0x651/0xbc0 net/netlink/af_netlink.c:1900
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb5/0x100 net/socket.c:656
 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062
 __sys_sendmsg+0xa3/0x120 net/socket.c:2096
 SYSC_sendmsg net/socket.c:2107 [inline]
 SyS_sendmsg+0x27/0x40 net/socket.c:2103
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7f05dfc4c0f9
RSP: 002b:00007f05de1be168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f05dfd6bf80 RCX: 00007f05dfc4c0f9
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000003
RBP: 00007f05dfca7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcb239276f R14: 00007f05de1be300 R15: 0000000000022000
can: request_module (can-proto-0) failed.
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 1 PID: 2749 Comm: syz-executor.5 Not tainted 4.14.307-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 fail_dump lib/fault-inject.c:51 [inline]
 should_fail.cold+0x10a/0x149 lib/fault-inject.c:149
 should_failslab+0xd6/0x130 mm/failslab.c:32
 slab_pre_alloc_hook mm/slab.h:421 [inline]
 slab_alloc mm/slab.c:3376 [inline]
 kmem_cache_alloc+0x28e/0x3c0 mm/slab.c:3550
 ptlock_alloc+0x1d/0x70 mm/memory.c:4871
 ptlock_init include/linux/mm.h:1764 [inline]
 pgtable_page_ctor include/linux/mm.h:1798 [inline]
 pte_alloc_one+0x57/0x100 arch/x86/mm/pgtable.c:33
 __do_huge_pmd_anonymous_page mm/huge_memory.c:568 [inline]
 do_huge_pmd_anonymous_page+0x8fc/0x1700 mm/huge_memory.c:731
 create_huge_pmd mm/memory.c:4007 [inline]
 __handle_mm_fault+0x2ac4/0x4620 mm/memory.c:4210
 handle_mm_fault+0x455/0x9c0 mm/memory.c:4276
 __do_page_fault+0x549/0xad0 arch/x86/mm/fault.c:1442
 page_fault+0x25/0x50 arch/x86/entry/entry_64.S:1126
RIP: 0010:copy_user_generic_unrolled+0x89/0xc0 arch/x86/lib/copy_user_64.S:67
RSP: 0018:ffff88807ad17e48 EFLAGS: 00050202
RAX: ffffed100f5a2fd8 RBX: 0000000000000020 RCX: 0000000000000004
RDX: 0000000000000000 RSI: ffff88807ad17ea0 RDI: 00000000200000c0
RBP: ffff88807ad17ea0 R08: 0000000000000000 R09: ffffed100f5a2fd7
R10: ffff88807ad17ebf R11: ffff88807b2bc400 R12: 00000000200000c0
R13: 00007ffffffff000 R14: 00000000200000e0 R15: 0000000000000000
 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline]
 raw_copy_to_user arch/x86/include/asm/uaccess_64.h:112 [inline]
 _copy_to_user+0xaa/0xd0 lib/usercopy.c:35
 copy_to_user include/linux/uaccess.h:155 [inline]
 SYSC_getitimer kernel/time/itimer.c:115 [inline]
 SyS_getitimer+0xbd/0xd0 kernel/time/itimer.c:107
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7f28f63410f9
RSP: 002b:00007f28f48b3168 EFLAGS: 00000246 ORIG_RAX: 0000000000000024
RAX: ffffffffffffffda RBX: 00007f28f6460f80 RCX: 00007f28f63410f9
RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000000
RBP: 00007f28f48b31d0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff9fbe0e4f R14: 00007f28f48b3300 R15: 0000000000022000