Warning: Permanently added '10.128.1.135' (ED25519) to the list of known hosts. executing program [ 42.930019][ T3962] BUG: sleeping function called from invalid context at include/linux/sched/mm.h:209 [ 42.932476][ T3962] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 3962, name: syz-executor192 [ 42.934859][ T3962] 2 locks held by syz-executor192/3962: [ 42.936271][ T3962] #0: ffff8000169e7428 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0xa2c/0xdac [ 42.938635][ T3962] #1: ffff0000c120d108 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 42.940907][ T3962] Preemption disabled at: [ 42.940920][ T3962] [] netem_change+0x22c/0x1a90 [ 42.943590][ T3962] CPU: 1 PID: 3962 Comm: syz-executor192 Not tainted 5.15.125-syzkaller #0 [ 42.945670][ T3962] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 [ 42.948165][ T3962] Call trace: [ 42.948994][ T3962] dump_backtrace+0x0/0x530 [ 42.950131][ T3962] show_stack+0x2c/0x3c [ 42.951141][ T3962] dump_stack_lvl+0x108/0x170 [ 42.952279][ T3962] dump_stack+0x1c/0x58 [ 42.953310][ T3962] ___might_sleep+0x380/0x4dc [ 42.954481][ T3962] __might_sleep+0x98/0xf0 [ 42.955591][ T3962] slab_pre_alloc_hook+0x58/0xe8 [ 42.956797][ T3962] __kmalloc_node+0xbc/0x5b8 [ 42.957968][ T3962] kvmalloc_node+0x88/0x204 [ 42.959125][ T3962] get_dist_table+0x9c/0x2a4 [ 42.960259][ T3962] netem_change+0x7cc/0x1a90 [ 42.961367][ T3962] netem_init+0x54/0xb8 [ 42.962415][ T3962] qdisc_create+0x6fc/0xf44 [ 42.963519][ T3962] tc_modify_qdisc+0x8dc/0x1344 [ 42.964734][ T3962] rtnetlink_rcv_msg+0xa74/0xdac [ 42.965936][ T3962] netlink_rcv_skb+0x20c/0x3b8 [ 42.967102][ T3962] rtnetlink_rcv+0x28/0x38 [ 42.968229][ T3962] netlink_unicast+0x664/0x938 [ 42.969419][ T3962] netlink_sendmsg+0x844/0xb38 [ 42.970600][ T3962] ____sys_sendmsg+0x584/0x870 [ 42.971800][ T3962] ___sys_sendmsg+0x214/0x294 [ 42.972952][ T3962] __arm64_sys_sendmsg+0x1ac/0x25c [ 42.974244][ T3962] invoke_syscall+0x98/0x2b8 [ 42.975346][ T3962] el0_svc_common+0x138/0x258 [ 42.976501][ T3962] do_el0_svc+0x58/0x14c [ 42.977537][ T3962] el0_svc+0x7c/0x1f0 [ 42.978455][ T3962] el0t_64_sync_handler+0x84/0xe4 [ 42.979718][ T3962] el0t_64_sync+0x1a0/0x1a4 [ 42.981031][ T3962] [ 42.981582][ T3962] ============================================ [ 42.983077][ T3962] WARNING: possible recursive locking detected [ 42.984604][ T3962] 5.15.125-syzkaller #0 Tainted: G W [ 42.986360][ T3962] -------------------------------------------- [ 42.987895][ T3962] syz-executor192/3962 is trying to acquire lock: [ 42.989502][ T3962] ffff0000c120d108 (&sch->q.lock){+...}-{2:2}, at: get_dist_table+0x1f0/0x2a4 [ 42.991837][ T3962] [ 42.991837][ T3962] but task is already holding lock: [ 42.993665][ T3962] ffff0000c120d108 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 42.995893][ T3962] [ 42.995893][ T3962] other info that might help us debug this: [ 42.997899][ T3962] Possible unsafe locking scenario: [ 42.997899][ T3962] [ 42.999812][ T3962] CPU0 [ 43.000653][ T3962] ---- [ 43.001471][ T3962] lock(&sch->q.lock); [ 43.002481][ T3962] lock(&sch->q.lock); [ 43.003511][ T3962] [ 43.003511][ T3962] *** DEADLOCK *** [ 43.003511][ T3962] [ 43.005607][ T3962] May be due to missing lock nesting notation [ 43.005607][ T3962] [ 43.007695][ T3962] 2 locks held by syz-executor192/3962: [ 43.009021][ T3962] #0: ffff8000169e7428 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0xa2c/0xdac [ 43.011422][ T3962] #1: ffff0000c120d108 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 43.013829][ T3962] [ 43.013829][ T3962] stack backtrace: [ 43.015364][ T3962] CPU: 1 PID: 3962 Comm: syz-executor192 Tainted: G W 5.15.125-syzkaller #0 [ 43.018062][ T3962] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 [ 43.020570][ T3962] Call trace: [ 43.021444][ T3962] dump_backtrace+0x0/0x530 [ 43.022637][ T3962] show_stack+0x2c/0x3c [ 43.023745][ T3962] dump_stack_lvl+0x108/0x170 [ 43.024995][ T3962] dump_stack+0x1c/0x58 [ 43.026105][ T3962] __lock_acquire+0x62b4/0x7620 [ 43.027317][ T3962] lock_acquire+0x240/0x77c [ 43.028447][ T3962] _raw_spin_lock_bh+0x124/0x1c4 [ 43.029792][ T3962] get_dist_table+0x1f0/0x2a4 [ 43.031028][ T3962] netem_change+0x7cc/0x1a90 [ 43.032186][ T3962] netem_init+0x54/0xb8 [ 43.033219][ T3962] qdisc_create+0x6fc/0xf44 [ 43.034326][ T3962] tc_modify_qdisc+0x8dc/0x1344 [ 43.035534][ T3962] rtnetlink_rcv_msg+0xa74/0xdac [ 43.036750][ T3962] netlink_rcv_skb+0x20c/0x3b8 [ 43.037942][ T3962] rtnetlink_rcv+0x28/0x38 [ 43.039025][ T3962] netlink_unicast+0x664/0x938 [ 43.040205][ T3962] netlink_sendmsg+0x844/0xb38 [ 43.041392][ T3962] ____sys_sendmsg+0x584/0x870 [ 43.042540][ T3962] ___sys_sendmsg+0x214/0x294 [ 43.043702][ T3962] __arm64_sys_sendmsg+0x1ac/0x25c [ 43.044976][ T3962] invoke_syscall+0x98/0x2b8 [ 43.046107][ T3962] el0_svc_common+0x138/0x258 [ 43.047344][ T3962] do_el0_svc+0x58/0x14c [ 43.048455][ T3962] el0_svc+0x7c/0x1f0 [ 43.049463][ T3962] el0t_64_sync_handler+0x84/0xe4 [ 43.050727][ T3962] el0t_64_sync+0x1a0/0x1a4