Warning: Permanently added '10.128.0.121' (ED25519) to the list of known hosts. executing program [ 44.470542][ T3963] netlink: 56 bytes leftover after parsing attributes in process `syz-executor397'. [ 44.473213][ T3963] BUG: sleeping function called from invalid context at include/linux/sched/mm.h:209 [ 44.475694][ T3963] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 3963, name: syz-executor397 [ 44.478234][ T3963] 2 locks held by syz-executor397/3963: [ 44.479666][ T3963] #0: ffff8000169e74a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0xa2c/0xdac [ 44.482127][ T3963] #1: ffff0000d7fa3908 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 44.484541][ T3963] Preemption disabled at: [ 44.484553][ T3963] [] netem_change+0x22c/0x1a90 [ 44.487332][ T3963] CPU: 0 PID: 3963 Comm: syz-executor397 Not tainted 5.15.126-syzkaller-00092-g24c4de4069cb #0 [ 44.490045][ T3963] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 [ 44.492669][ T3963] Call trace: [ 44.493505][ T3963] dump_backtrace+0x0/0x530 [ 44.494644][ T3963] show_stack+0x2c/0x3c [ 44.495671][ T3963] dump_stack_lvl+0x108/0x170 [ 44.496861][ T3963] dump_stack+0x1c/0x58 [ 44.497941][ T3963] ___might_sleep+0x380/0x4dc [ 44.499212][ T3963] __might_sleep+0x98/0xf0 [ 44.500407][ T3963] slab_pre_alloc_hook+0x58/0xe8 [ 44.501757][ T3963] __kmalloc_node+0xbc/0x5b8 [ 44.503002][ T3963] kvmalloc_node+0x88/0x204 [ 44.504196][ T3963] get_dist_table+0x9c/0x2a4 [ 44.505397][ T3963] netem_change+0x7cc/0x1a90 [ 44.506596][ T3963] netem_init+0x54/0xb8 [ 44.507680][ T3963] qdisc_create+0x6fc/0xf44 [ 44.508854][ T3963] tc_modify_qdisc+0x8dc/0x1344 [ 44.510165][ T3963] rtnetlink_rcv_msg+0xa74/0xdac [ 44.511478][ T3963] netlink_rcv_skb+0x20c/0x3b8 [ 44.512752][ T3963] rtnetlink_rcv+0x28/0x38 [ 44.513968][ T3963] netlink_unicast+0x664/0x938 [ 44.515288][ T3963] netlink_sendmsg+0x844/0xb38 [ 44.516602][ T3963] ____sys_sendmsg+0x584/0x870 [ 44.517888][ T3963] ___sys_sendmsg+0x214/0x294 [ 44.519153][ T3963] __arm64_sys_sendmsg+0x1ac/0x25c [ 44.520552][ T3963] invoke_syscall+0x98/0x2b8 [ 44.521796][ T3963] el0_svc_common+0x138/0x258 [ 44.523092][ T3963] do_el0_svc+0x58/0x14c [ 44.524246][ T3963] el0_svc+0x7c/0x1f0 [ 44.525309][ T3963] el0t_64_sync_handler+0x84/0xe4 [ 44.526679][ T3963] el0t_64_sync+0x1a0/0x1a4 [ 44.528066][ T3963] [ 44.528670][ T3963] ============================================ [ 44.530279][ T3963] WARNING: possible recursive locking detected [ 44.531857][ T3963] 5.15.126-syzkaller-00092-g24c4de4069cb #0 Tainted: G W [ 44.533972][ T3963] -------------------------------------------- [ 44.535533][ T3963] syz-executor397/3963 is trying to acquire lock: [ 44.537198][ T3963] ffff0000d7fa3908 (&sch->q.lock){+...}-{2:2}, at: get_dist_table+0x1f0/0x2a4 [ 44.539568][ T3963] [ 44.539568][ T3963] but task is already holding lock: [ 44.541520][ T3963] ffff0000d7fa3908 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 44.543893][ T3963] [ 44.543893][ T3963] other info that might help us debug this: [ 44.546044][ T3963] Possible unsafe locking scenario: [ 44.546044][ T3963] [ 44.548067][ T3963] CPU0 [ 44.548919][ T3963] ---- [ 44.549759][ T3963] lock(&sch->q.lock); [ 44.550881][ T3963] lock(&sch->q.lock); [ 44.552041][ T3963] [ 44.552041][ T3963] *** DEADLOCK *** [ 44.552041][ T3963] [ 44.554237][ T3963] May be due to missing lock nesting notation [ 44.554237][ T3963] [ 44.556413][ T3963] 2 locks held by syz-executor397/3963: [ 44.557869][ T3963] #0: ffff8000169e74a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0xa2c/0xdac [ 44.560394][ T3963] #1: ffff0000d7fa3908 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 44.562838][ T3963] [ 44.562838][ T3963] stack backtrace: [ 44.564396][ T3963] CPU: 0 PID: 3963 Comm: syz-executor397 Tainted: G W 5.15.126-syzkaller-00092-g24c4de4069cb #0 [ 44.567491][ T3963] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 [ 44.570127][ T3963] Call trace: [ 44.570995][ T3963] dump_backtrace+0x0/0x530 [ 44.572183][ T3963] show_stack+0x2c/0x3c [ 44.573308][ T3963] dump_stack_lvl+0x108/0x170 [ 44.574566][ T3963] dump_stack+0x1c/0x58 [ 44.575692][ T3963] __lock_acquire+0x62b4/0x7620 [ 44.577024][ T3963] lock_acquire+0x240/0x77c [ 44.578273][ T3963] _raw_spin_lock_bh+0x124/0x1c4 [ 44.579560][ T3963] get_dist_table+0x1f0/0x2a4 [ 44.580854][ T3963] netem_change+0x7cc/0x1a90 [ 44.582068][ T3963] netem_init+0x54/0xb8 [ 44.583178][ T3963] qdisc_create+0x6fc/0xf44 [ 44.584367][ T3963] tc_modify_qdisc+0x8dc/0x1344 [ 44.585676][ T3963] rtnetlink_rcv_msg+0xa74/0xdac [ 44.587065][ T3963] netlink_rcv_skb+0x20c/0x3b8 [ 44.588315][ T3963] rtnetlink_rcv+0x28/0x38 [ 44.589521][ T3963] netlink_unicast+0x664/0x938 [ 44.590747][ T3963] netlink_sendmsg+0x844/0xb38 [ 44.592025][ T3963] ____sys_sendmsg+0x584/0x870 [ 44.593341][ T3963] ___sys_sendmsg+0x214/0x294 [ 44.594590][ T3963] __arm64_sys_sendmsg+0x1ac/0x25c [ 44.595907][ T3963] invoke_syscall+0x98/0x2b8 [ 44.597105][ T3963] el0_svc_common+0x138/0x258 [ 44.598363][ T3963] do_el0_svc+0x58/0x14c [ 44.599486][ T3963] el0_svc+0x7c/0x1f0 [ 44.600549][ T3963] el0t_64_sync_handler+0x84/0xe4 [ 44.601898][ T3963] el0t_64_sync+0x1a0/0x1a4