Warning: Permanently added '10.128.1.56' (ED25519) to the list of known hosts. executing program [ 44.529120][ T3963] BUG: sleeping function called from invalid context at include/linux/sched/mm.h:209 [ 44.531331][ T3963] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 3963, name: syz-executor238 [ 44.533494][ T3963] 2 locks held by syz-executor238/3963: [ 44.534740][ T3963] #0: ffff8000169e74a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0xa2c/0xdac [ 44.536828][ T3963] #1: ffff0000cab9c108 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 44.538873][ T3963] Preemption disabled at: [ 44.538898][ T3963] [] netem_change+0x22c/0x1a90 [ 44.541072][ T3963] CPU: 1 PID: 3963 Comm: syz-executor238 Not tainted 5.15.126-syzkaller-00092-g24c4de4069cb #0 [ 44.543241][ T3963] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 [ 44.545362][ T3963] Call trace: [ 44.546024][ T3963] dump_backtrace+0x0/0x530 [ 44.546975][ T3963] show_stack+0x2c/0x3c [ 44.547869][ T3963] dump_stack_lvl+0x108/0x170 [ 44.548920][ T3963] dump_stack+0x1c/0x58 [ 44.549749][ T3963] ___might_sleep+0x380/0x4dc [ 44.550733][ T3963] __might_sleep+0x98/0xf0 [ 44.551666][ T3963] slab_pre_alloc_hook+0x58/0xe8 [ 44.552754][ T3963] __kmalloc_node+0xbc/0x5b8 [ 44.553765][ T3963] kvmalloc_node+0x88/0x204 [ 44.554655][ T3963] get_dist_table+0x9c/0x2a4 [ 44.555607][ T3963] netem_change+0x7cc/0x1a90 [ 44.556551][ T3963] netem_init+0x54/0xb8 [ 44.557388][ T3963] qdisc_create+0x6fc/0xf44 [ 44.558350][ T3963] tc_modify_qdisc+0x8dc/0x1344 [ 44.559335][ T3963] rtnetlink_rcv_msg+0xa74/0xdac [ 44.560463][ T3963] netlink_rcv_skb+0x20c/0x3b8 [ 44.561465][ T3963] rtnetlink_rcv+0x28/0x38 [ 44.562427][ T3963] netlink_unicast+0x664/0x938 [ 44.563469][ T3963] netlink_sendmsg+0x844/0xb38 [ 44.564442][ T3963] ____sys_sendmsg+0x584/0x870 [ 44.565440][ T3963] ___sys_sendmsg+0x214/0x294 [ 44.566474][ T3963] __arm64_sys_sendmsg+0x1ac/0x25c [ 44.567617][ T3963] invoke_syscall+0x98/0x2b8 [ 44.568625][ T3963] el0_svc_common+0x138/0x258 [ 44.569643][ T3963] do_el0_svc+0x58/0x14c [ 44.570519][ T3963] el0_svc+0x7c/0x1f0 [ 44.571385][ T3963] el0t_64_sync_handler+0x84/0xe4 [ 44.572496][ T3963] el0t_64_sync+0x1a0/0x1a4 [ 44.573505][ T3963] [ 44.574070][ T3963] ============================================ [ 44.575336][ T3963] WARNING: possible recursive locking detected [ 44.576583][ T3963] 5.15.126-syzkaller-00092-g24c4de4069cb #0 Tainted: G W [ 44.578332][ T3963] -------------------------------------------- [ 44.579706][ T3963] syz-executor238/3963 is trying to acquire lock: [ 44.581054][ T3963] ffff0000cab9c108 (&sch->q.lock){+...}-{2:2}, at: get_dist_table+0x1f0/0x2a4 [ 44.582975][ T3963] [ 44.582975][ T3963] but task is already holding lock: [ 44.584554][ T3963] ffff0000cab9c108 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 44.586494][ T3963] [ 44.586494][ T3963] other info that might help us debug this: [ 44.588193][ T3963] Possible unsafe locking scenario: [ 44.588193][ T3963] [ 44.589870][ T3963] CPU0 [ 44.590627][ T3963] ---- [ 44.591343][ T3963] lock(&sch->q.lock); [ 44.592227][ T3963] lock(&sch->q.lock); [ 44.593094][ T3963] [ 44.593094][ T3963] *** DEADLOCK *** [ 44.593094][ T3963] [ 44.594975][ T3963] May be due to missing lock nesting notation [ 44.594975][ T3963] [ 44.596789][ T3963] 2 locks held by syz-executor238/3963: [ 44.597988][ T3963] #0: ffff8000169e74a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0xa2c/0xdac [ 44.600061][ T3963] #1: ffff0000cab9c108 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 44.602057][ T3963] [ 44.602057][ T3963] stack backtrace: [ 44.603304][ T3963] CPU: 1 PID: 3963 Comm: syz-executor238 Tainted: G W 5.15.126-syzkaller-00092-g24c4de4069cb #0 [ 44.605780][ T3963] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 [ 44.607880][ T3963] Call trace: [ 44.608558][ T3963] dump_backtrace+0x0/0x530 [ 44.609532][ T3963] show_stack+0x2c/0x3c [ 44.610406][ T3963] dump_stack_lvl+0x108/0x170 [ 44.611423][ T3963] dump_stack+0x1c/0x58 [ 44.612278][ T3963] __lock_acquire+0x62b4/0x7620 [ 44.613333][ T3963] lock_acquire+0x240/0x77c [ 44.614341][ T3963] _raw_spin_lock_bh+0x124/0x1c4 [ 44.615431][ T3963] get_dist_table+0x1f0/0x2a4 [ 44.616366][ T3963] netem_change+0x7cc/0x1a90 [ 44.617315][ T3963] netem_init+0x54/0xb8 [ 44.618181][ T3963] qdisc_create+0x6fc/0xf44 [ 44.619199][ T3963] tc_modify_qdisc+0x8dc/0x1344 [ 44.620203][ T3963] rtnetlink_rcv_msg+0xa74/0xdac [ 44.621216][ T3963] netlink_rcv_skb+0x20c/0x3b8 [ 44.622302][ T3963] rtnetlink_rcv+0x28/0x38 [ 44.623296][ T3963] netlink_unicast+0x664/0x938 [ 44.624265][ T3963] netlink_sendmsg+0x844/0xb38 [ 44.625310][ T3963] ____sys_sendmsg+0x584/0x870 [ 44.626420][ T3963] ___sys_sendmsg+0x214/0x294 [ 44.627363][ T3963] __arm64_sys_sendmsg+0x1ac/0x25c [ 44.628486][ T3963] invoke_syscall+0x98/0x2b8 [ 44.629409][ T3963] el0_svc_common+0x138/0x258 [ 44.630535][ T3963] do_el0_svc+0x58/0x14c [ 44.631487][ T3963] el0_svc+0x7c/0x1f0 [ 44.632319][ T3963] el0t_64_sync_handler+0x84/0xe4 [ 44.633417][ T3963] el0t_64_sync+0x1a0/0x1a4