============================= WARNING: suspicious RCU usage 5.10.0-syzkaller #0 Not tainted ----------------------------- kernel/sched/core.c:7877 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 syz-executor.0/9704: #0: ffff888013794458 (&xt[i].mutex){+.+.}-{3:3}, at: xt_find_table_lock+0x41/0x540 net/netfilter/x_tables.c:1206 stack backtrace: CPU: 0 PID: 9704 Comm: syz-executor.0 Not tainted 5.10.0-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:7877 __might_fault+0x6e/0x180 mm/memory.c:5014 xt_obj_to_user+0x31/0x110 net/netfilter/x_tables.c:277 xt_target_to_user+0xa8/0x200 net/netfilter/x_tables.c:323 copy_entries_to_user net/ipv4/netfilter/arp_tables.c:705 [inline] get_entries net/ipv4/netfilter/arp_tables.c:866 [inline] do_arpt_get_ctl+0x733/0x8f0 net/ipv4/netfilter/arp_tables.c:1450 nf_getsockopt+0x72/0xd0 net/netfilter/nf_sockopt.c:116 ip_getsockopt net/ipv4/ip_sockglue.c:1777 [inline] ip_getsockopt+0x164/0x1c0 net/ipv4/ip_sockglue.c:1756 tcp_getsockopt+0x86/0xd0 net/ipv4/tcp.c:4141 __sys_getsockopt+0x219/0x4c0 net/socket.c:2156 __do_sys_getsockopt net/socket.c:2171 [inline] __se_sys_getsockopt net/socket.c:2168 [inline] __x64_sys_getsockopt+0xba/0x150 net/socket.c:2168 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45ef5a Code: b8 34 01 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 cd 9f fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 aa 9f fb ff c3 66 0f 1f 84 00 00 00 00 00 RSP: 002b:00007ffcf91ed728 EFLAGS: 00000212 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 00007ffcf91ed790 RCX: 000000000045ef5a RDX: 0000000000000061 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 0000000000000003 R08: 00007ffcf91ed73c R09: 000000000000000a R10: 00007ffcf91ed790 R11: 0000000000000212 R12: 00007ffcf91ed73c R13: 0000000000000000 R14: 0000000000000032 R15: 000000000003354d