Warning: Permanently added '10.128.1.86' (ED25519) to the list of known hosts. executing program [ 39.771298][ T3960] BUG: sleeping function called from invalid context at include/linux/sched/mm.h:209 [ 39.774063][ T3960] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 3960, name: syz-executor219 [ 39.776532][ T3960] 2 locks held by syz-executor219/3960: [ 39.777970][ T3960] #0: ffff8000169e7128 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0xa2c/0xdac [ 39.780440][ T3960] #1: ffff0000c9d88908 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 39.782864][ T3960] Preemption disabled at: [ 39.782877][ T3960] [] netem_change+0x22c/0x1a90 [ 39.785735][ T3960] CPU: 1 PID: 3960 Comm: syz-executor219 Not tainted 5.15.123-syzkaller #0 [ 39.787893][ T3960] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 [ 39.790453][ T3960] Call trace: [ 39.791282][ T3960] dump_backtrace+0x0/0x530 [ 39.792457][ T3960] show_stack+0x2c/0x3c [ 39.793549][ T3960] dump_stack_lvl+0x108/0x170 [ 39.794797][ T3960] dump_stack+0x1c/0x58 [ 39.795949][ T3960] ___might_sleep+0x380/0x4dc [ 39.797159][ T3960] __might_sleep+0x98/0xf0 [ 39.798318][ T3960] slab_pre_alloc_hook+0x58/0xe8 [ 39.799619][ T3960] __kmalloc_node+0xbc/0x5b8 [ 39.800874][ T3960] kvmalloc_node+0x88/0x204 [ 39.802139][ T3960] get_dist_table+0x9c/0x2a4 [ 39.803384][ T3960] netem_change+0x7cc/0x1a90 [ 39.804657][ T3960] netem_init+0x54/0xb8 [ 39.805724][ T3960] qdisc_create+0x6fc/0xf44 [ 39.806943][ T3960] tc_modify_qdisc+0x8dc/0x1344 [ 39.808235][ T3960] rtnetlink_rcv_msg+0xa74/0xdac [ 39.809558][ T3960] netlink_rcv_skb+0x20c/0x3b8 [ 39.810836][ T3960] rtnetlink_rcv+0x28/0x38 [ 39.812005][ T3960] netlink_unicast+0x664/0x938 [ 39.813281][ T3960] netlink_sendmsg+0x844/0xb38 [ 39.814582][ T3960] ____sys_sendmsg+0x584/0x870 [ 39.815849][ T3960] ___sys_sendmsg+0x214/0x294 [ 39.817103][ T3960] __arm64_sys_sendmsg+0x1ac/0x25c [ 39.818528][ T3960] invoke_syscall+0x98/0x2b8 [ 39.819780][ T3960] el0_svc_common+0x138/0x258 [ 39.821076][ T3960] do_el0_svc+0x58/0x14c [ 39.822243][ T3960] el0_svc+0x7c/0x1f0 [ 39.823323][ T3960] el0t_64_sync_handler+0x84/0xe4 [ 39.824615][ T3960] el0t_64_sync+0x1a0/0x1a4 [ 39.825912][ T3960] [ 39.826533][ T3960] ============================================ [ 39.828123][ T3960] WARNING: possible recursive locking detected [ 39.829690][ T3960] 5.15.123-syzkaller #0 Tainted: G W [ 39.831448][ T3960] -------------------------------------------- [ 39.833159][ T3960] syz-executor219/3960 is trying to acquire lock: [ 39.834936][ T3960] ffff0000c9d88908 (&sch->q.lock){+...}-{2:2}, at: get_dist_table+0x1f0/0x2a4 [ 39.837368][ T3960] [ 39.837368][ T3960] but task is already holding lock: [ 39.839404][ T3960] ffff0000c9d88908 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 39.841874][ T3960] [ 39.841874][ T3960] other info that might help us debug this: [ 39.844107][ T3960] Possible unsafe locking scenario: [ 39.844107][ T3960] [ 39.846184][ T3960] CPU0 [ 39.847077][ T3960] ---- [ 39.847952][ T3960] lock(&sch->q.lock); [ 39.849098][ T3960] lock(&sch->q.lock); [ 39.850178][ T3960] [ 39.850178][ T3960] *** DEADLOCK *** [ 39.850178][ T3960] [ 39.852355][ T3960] May be due to missing lock nesting notation [ 39.852355][ T3960] [ 39.854603][ T3960] 2 locks held by syz-executor219/3960: [ 39.856093][ T3960] #0: ffff8000169e7128 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0xa2c/0xdac [ 39.858677][ T3960] #1: ffff0000c9d88908 (&sch->q.lock){+...}-{2:2}, at: netem_change+0x22c/0x1a90 [ 39.861183][ T3960] [ 39.861183][ T3960] stack backtrace: [ 39.862741][ T3960] CPU: 1 PID: 3960 Comm: syz-executor219 Tainted: G W 5.15.123-syzkaller #0 [ 39.865424][ T3960] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 [ 39.868107][ T3960] Call trace: [ 39.868946][ T3960] dump_backtrace+0x0/0x530 [ 39.870159][ T3960] show_stack+0x2c/0x3c [ 39.871297][ T3960] dump_stack_lvl+0x108/0x170 [ 39.872559][ T3960] dump_stack+0x1c/0x58 [ 39.873694][ T3960] __lock_acquire+0x62b4/0x7620 [ 39.874999][ T3960] lock_acquire+0x240/0x77c [ 39.876186][ T3960] _raw_spin_lock_bh+0x124/0x1c4 [ 39.877499][ T3960] get_dist_table+0x1f0/0x2a4 [ 39.878782][ T3960] netem_change+0x7cc/0x1a90 [ 39.880016][ T3960] netem_init+0x54/0xb8 [ 39.881130][ T3960] qdisc_create+0x6fc/0xf44 [ 39.882352][ T3960] tc_modify_qdisc+0x8dc/0x1344 [ 39.883678][ T3960] rtnetlink_rcv_msg+0xa74/0xdac [ 39.885033][ T3960] netlink_rcv_skb+0x20c/0x3b8 [ 39.886325][ T3960] rtnetlink_rcv+0x28/0x38 [ 39.887546][ T3960] netlink_unicast+0x664/0x938 [ 39.888838][ T3960] netlink_sendmsg+0x844/0xb38 [ 39.890098][ T3960] ____sys_sendmsg+0x584/0x870 [ 39.891365][ T3960] ___sys_sendmsg+0x214/0x294 [ 39.892618][ T3960] __arm64_sys_sendmsg+0x1ac/0x25c [ 39.894036][ T3960] invoke_syscall+0x98/0x2b8 [ 39.895310][ T3960] el0_svc_common+0x138/0x258 [ 39.896576][ T3960] do_el0_svc+0x58/0x14c [ 39.897669][ T3960] el0_svc+0x7c/0x1f0 [ 39.898779][ T3960] el0t_64_sync_handler+0x84/0xe4 [ 39.900136][ T3960] el0t_64_sync+0x1a0/0x1a4