Warning: Permanently added '10.128.0.79' (ED25519) to the list of known hosts. executing program [ 36.563384][ T4218] netlink: 40 bytes leftover after parsing attributes in process `syz-executor449'. [ 36.565964][ T4218] BUG: sleeping function called from invalid context at include/linux/sched/mm.h:274 [ 36.568392][ T4218] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 4218, name: syz-executor449 [ 36.570885][ T4218] preempt_count: 201, expected: 0 [ 36.572178][ T4218] RCU nest depth: 0, expected: 0 [ 36.573458][ T4218] 2 locks held by syz-executor449/4218: [ 36.574924][ T4218] #0: ffff800017e6f7c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e8/0xd94 [ 36.577327][ T4218] #1: ffff0000d471c908 (&sch->q.lock){+...}-{2:2}, at: sch_tree_lock+0x120/0x1d4 [ 36.579628][ T4218] Preemption disabled at: [ 36.579638][ T4218] [] sch_tree_lock+0x120/0x1d4 [ 36.582291][ T4218] CPU: 1 PID: 4218 Comm: syz-executor449 Not tainted 6.1.42-syzkaller #0 [ 36.584472][ T4218] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 [ 36.587041][ T4218] Call trace: [ 36.587866][ T4218] dump_backtrace+0x1c8/0x1f4 [ 36.589110][ T4218] show_stack+0x2c/0x3c [ 36.590169][ T4218] dump_stack_lvl+0x108/0x170 [ 36.591393][ T4218] dump_stack+0x1c/0x58 [ 36.592510][ T4218] __might_resched+0x37c/0x4d8 [ 36.593714][ T4218] __might_sleep+0x90/0xe4 [ 36.594890][ T4218] __kmem_cache_alloc_node+0x74/0x388 [ 36.596336][ T4218] __kmalloc_node+0xcc/0x1d0 [ 36.597558][ T4218] kvmalloc_node+0x84/0x1e4 [ 36.598731][ T4218] get_dist_table+0xa0/0x354 [ 36.599980][ T4218] netem_change+0x754/0x1900 [ 36.601340][ T4218] netem_init+0x54/0xb8 [ 36.602508][ T4218] qdisc_create+0x70c/0xe64 [ 36.603667][ T4218] tc_modify_qdisc+0x9f0/0x1840 [ 36.604941][ T4218] rtnetlink_rcv_msg+0x72c/0xd94 [ 36.606254][ T4218] netlink_rcv_skb+0x20c/0x3b8 [ 36.607531][ T4218] rtnetlink_rcv+0x28/0x38 [ 36.608656][ T4218] netlink_unicast+0x660/0x8d4 [ 36.609892][ T4218] netlink_sendmsg+0x834/0xb18 [ 36.611109][ T4218] ____sys_sendmsg+0x558/0x844 [ 36.612376][ T4218] __sys_sendmsg+0x26c/0x33c [ 36.613592][ T4218] __arm64_sys_sendmsg+0x80/0x94 [ 36.614875][ T4218] invoke_syscall+0x98/0x2c0 [ 36.616094][ T4218] el0_svc_common+0x138/0x258 [ 36.617304][ T4218] do_el0_svc+0x64/0x218 [ 36.618382][ T4218] el0_svc+0x58/0x168 [ 36.619428][ T4218] el0t_64_sync_handler+0x84/0xf0 [ 36.620740][ T4218] el0t_64_sync+0x18c/0x190 [ 36.622035][ T4218] [ 36.622595][ T4218] ============================================ [ 36.624171][ T4218] WARNING: possible recursive locking detected [ 36.625702][ T4218] 6.1.42-syzkaller #0 Tainted: G W [ 36.627361][ T4218] -------------------------------------------- [ 36.628965][ T4218] syz-executor449/4218 is trying to acquire lock: [ 36.630669][ T4218] ffff0000d471c908 (&sch->q.lock){+...}-{2:2}, at: get_dist_table+0x240/0x354 [ 36.633002][ T4218] [ 36.633002][ T4218] but task is already holding lock: [ 36.634886][ T4218] ffff0000d471c908 (&sch->q.lock){+...}-{2:2}, at: sch_tree_lock+0x120/0x1d4 [ 36.637168][ T4218] [ 36.637168][ T4218] other info that might help us debug this: [ 36.639255][ T4218] Possible unsafe locking scenario: [ 36.639255][ T4218] [ 36.641164][ T4218] CPU0 [ 36.642003][ T4218] ---- [ 36.642830][ T4218] lock(&sch->q.lock); [ 36.643900][ T4218] lock(&sch->q.lock); [ 36.644992][ T4218] [ 36.644992][ T4218] *** DEADLOCK *** [ 36.644992][ T4218] [ 36.647134][ T4218] May be due to missing lock nesting notation [ 36.647134][ T4218] [ 36.649294][ T4218] 2 locks held by syz-executor449/4218: [ 36.650689][ T4218] #0: ffff800017e6f7c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e8/0xd94 [ 36.653124][ T4218] #1: ffff0000d471c908 (&sch->q.lock){+...}-{2:2}, at: sch_tree_lock+0x120/0x1d4 [ 36.655525][ T4218] [ 36.655525][ T4218] stack backtrace: [ 36.657067][ T4218] CPU: 1 PID: 4218 Comm: syz-executor449 Tainted: G W 6.1.42-syzkaller #0 [ 36.659704][ T4218] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 [ 36.662356][ T4218] Call trace: [ 36.663202][ T4218] dump_backtrace+0x1c8/0x1f4 [ 36.664427][ T4218] show_stack+0x2c/0x3c [ 36.665467][ T4218] dump_stack_lvl+0x108/0x170 [ 36.666690][ T4218] dump_stack+0x1c/0x58 [ 36.667803][ T4218] __lock_acquire+0x6310/0x764c [ 36.669045][ T4218] lock_acquire+0x26c/0x7cc [ 36.670235][ T4218] _raw_spin_lock_bh+0x54/0x6c [ 36.671490][ T4218] get_dist_table+0x240/0x354 [ 36.672683][ T4218] netem_change+0x754/0x1900 [ 36.673844][ T4218] netem_init+0x54/0xb8 [ 36.674917][ T4218] qdisc_create+0x70c/0xe64 [ 36.676050][ T4218] tc_modify_qdisc+0x9f0/0x1840 [ 36.677334][ T4218] rtnetlink_rcv_msg+0x72c/0xd94 [ 36.678596][ T4218] netlink_rcv_skb+0x20c/0x3b8 [ 36.679819][ T4218] rtnetlink_rcv+0x28/0x38 [ 36.680946][ T4218] netlink_unicast+0x660/0x8d4 [ 36.682194][ T4218] netlink_sendmsg+0x834/0xb18 [ 36.683443][ T4218] ____sys_sendmsg+0x558/0x844 [ 36.684740][ T4218] __sys_sendmsg+0x26c/0x33c [ 36.685952][ T4218] __arm64_sys_sendmsg+0x80/0x94 [ 36.687246][ T4218] invoke_syscall+0x98/0x2c0 [ 36.688459][ T4218] el0_svc_common+0x138/0x258 [ 36.689691][ T4218] do_el0_svc+0x64/0x218 [ 36.690773][ T4218] el0_svc+0x58/0x168 [ 36.691824][ T4218] el0t_64_sync_handler+0x84/0xf0 [ 36.693116][ T4218] el0t_64_sync+0x18c/0x190