Warning: Permanently added '10.128.0.49' (ED25519) to the list of known hosts. executing program [ 42.827301][ T3963] BUG: sleeping function called from invalid context at include/linux/sched/mm.h:209 [ 42.829588][ T3963] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 3963, name: syz-executor143 [ 42.831976][ T3963] 2 locks held by syz-executor143/3963: [ 42.833196][ T3963] #0: ffff8000169e74a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0xa2c/0xdac [ 42.835297][ T3963] #1: ffff0000c85a6108 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 42.837303][ T3963] Preemption disabled at: [ 42.837316][ T3963] [] netem_change+0x22c/0x1a90 [ 42.839571][ T3963] CPU: 1 PID: 3963 Comm: syz-executor143 Not tainted 5.15.126-syzkaller-00092-g24c4de4069cb #0 [ 42.841918][ T3963] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 [ 42.844178][ T3963] Call trace: [ 42.844906][ T3963] dump_backtrace+0x0/0x530 [ 42.845924][ T3963] show_stack+0x2c/0x3c [ 42.846868][ T3963] dump_stack_lvl+0x108/0x170 [ 42.847829][ T3963] dump_stack+0x1c/0x58 [ 42.848801][ T3963] ___might_sleep+0x380/0x4dc [ 42.849848][ T3963] __might_sleep+0x98/0xf0 [ 42.850940][ T3963] slab_pre_alloc_hook+0x58/0xe8 [ 42.852155][ T3963] __kmalloc_node+0xbc/0x5b8 [ 42.853197][ T3963] kvmalloc_node+0x88/0x204 [ 42.854202][ T3963] get_dist_table+0x9c/0x2a4 [ 42.855197][ T3963] netem_change+0x820/0x1a90 [ 42.856261][ T3963] netem_init+0x54/0xb8 [ 42.857102][ T3963] qdisc_create+0x6fc/0xf44 [ 42.858123][ T3963] tc_modify_qdisc+0x8dc/0x1344 [ 42.859214][ T3963] rtnetlink_rcv_msg+0xa74/0xdac [ 42.860357][ T3963] netlink_rcv_skb+0x20c/0x3b8 [ 42.861384][ T3963] rtnetlink_rcv+0x28/0x38 [ 42.862360][ T3963] netlink_unicast+0x664/0x938 [ 42.863426][ T3963] netlink_sendmsg+0x844/0xb38 [ 42.864461][ T3963] ____sys_sendmsg+0x584/0x870 [ 42.865472][ T3963] ___sys_sendmsg+0x214/0x294 [ 42.866515][ T3963] __arm64_sys_sendmsg+0x1ac/0x25c [ 42.867654][ T3963] invoke_syscall+0x98/0x2b8 [ 42.868617][ T3963] el0_svc_common+0x138/0x258 [ 42.869621][ T3963] do_el0_svc+0x58/0x14c [ 42.870645][ T3963] el0_svc+0x7c/0x1f0 [ 42.871548][ T3963] el0t_64_sync_handler+0x84/0xe4 [ 42.872694][ T3963] el0t_64_sync+0x1a0/0x1a4 [ 42.873912][ T3963] [ 42.874409][ T3963] ============================================ [ 42.875725][ T3963] WARNING: possible recursive locking detected [ 42.877127][ T3963] 5.15.126-syzkaller-00092-g24c4de4069cb #0 Tainted: G W [ 42.878945][ T3963] -------------------------------------------- [ 42.880235][ T3963] syz-executor143/3963 is trying to acquire lock: [ 42.881600][ T3963] ffff0000c85a6108 (&sch->q.lock){+...}-{2:2}, at: get_dist_table+0x1f0/0x2a4 [ 42.883501][ T3963] [ 42.883501][ T3963] but task is already holding lock: [ 42.885128][ T3963] ffff0000c85a6108 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 42.887008][ T3963] [ 42.887008][ T3963] other info that might help us debug this: [ 42.888682][ T3963] Possible unsafe locking scenario: [ 42.888682][ T3963] [ 42.890288][ T3963] CPU0 [ 42.891055][ T3963] ---- [ 42.891749][ T3963] lock(&sch->q.lock); [ 42.892680][ T3963] lock(&sch->q.lock); [ 42.893611][ T3963] [ 42.893611][ T3963] *** DEADLOCK *** [ 42.893611][ T3963] [ 42.895512][ T3963] May be due to missing lock nesting notation [ 42.895512][ T3963] [ 42.897353][ T3963] 2 locks held by syz-executor143/3963: [ 42.898564][ T3963] #0: ffff8000169e74a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0xa2c/0xdac [ 42.900624][ T3963] #1: ffff0000c85a6108 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 42.902657][ T3963] [ 42.902657][ T3963] stack backtrace: [ 42.904047][ T3963] CPU: 1 PID: 3963 Comm: syz-executor143 Tainted: G W 5.15.126-syzkaller-00092-g24c4de4069cb #0 [ 42.906516][ T3963] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 [ 42.908792][ T3963] Call trace: [ 42.909588][ T3963] dump_backtrace+0x0/0x530 [ 42.910647][ T3963] show_stack+0x2c/0x3c [ 42.911546][ T3963] dump_stack_lvl+0x108/0x170 [ 42.912570][ T3963] dump_stack+0x1c/0x58 [ 42.913459][ T3963] __lock_acquire+0x62b4/0x7620 [ 42.914504][ T3963] lock_acquire+0x240/0x77c [ 42.915529][ T3963] _raw_spin_lock_bh+0x124/0x1c4 [ 42.916588][ T3963] get_dist_table+0x1f0/0x2a4 [ 42.917582][ T3963] netem_change+0x820/0x1a90 [ 42.918682][ T3963] netem_init+0x54/0xb8 [ 42.919619][ T3963] qdisc_create+0x6fc/0xf44 [ 42.920541][ T3963] tc_modify_qdisc+0x8dc/0x1344 [ 42.921514][ T3963] rtnetlink_rcv_msg+0xa74/0xdac [ 42.922527][ T3963] netlink_rcv_skb+0x20c/0x3b8 [ 42.923592][ T3963] rtnetlink_rcv+0x28/0x38 [ 42.924605][ T3963] netlink_unicast+0x664/0x938 [ 42.925680][ T3963] netlink_sendmsg+0x844/0xb38 [ 42.926754][ T3963] ____sys_sendmsg+0x584/0x870 [ 42.927759][ T3963] ___sys_sendmsg+0x214/0x294 [ 42.928742][ T3963] __arm64_sys_sendmsg+0x1ac/0x25c [ 42.929825][ T3963] invoke_syscall+0x98/0x2b8 [ 42.930862][ T3963] el0_svc_common+0x138/0x258 [ 42.932003][ T3963] do_el0_svc+0x58/0x14c [ 42.932985][ T3963] el0_svc+0x7c/0x1f0 [ 42.933920][ T3963] el0t_64_sync_handler+0x84/0xe4 [ 42.935051][ T3963] el0t_64_sync+0x1a0/0x1a4