Warning: Permanently added '10.128.1.25' (ED25519) to the list of known hosts. executing program [ 39.954915][ T4217] netlink: 4 bytes leftover after parsing attributes in process `syz-executor421'. [ 39.957556][ T4217] BUG: sleeping function called from invalid context at include/linux/sched/mm.h:274 [ 39.959871][ T4217] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 4217, name: syz-executor421 [ 39.962316][ T4217] preempt_count: 201, expected: 0 [ 39.963662][ T4217] RCU nest depth: 0, expected: 0 [ 39.964967][ T4217] 2 locks held by syz-executor421/4217: [ 39.966368][ T4217] #0: ffff800017e6fdc8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e8/0xd94 [ 39.968752][ T4217] #1: ffff0000d4f6e908 (&sch->q.lock){+...}-{2:2}, at: sch_tree_lock+0x120/0x1d4 [ 39.971185][ T4217] Preemption disabled at: [ 39.971197][ T4217] [] sch_tree_lock+0x120/0x1d4 [ 39.974031][ T4217] CPU: 1 PID: 4217 Comm: syz-executor421 Not tainted 6.1.45-syzkaller #0 [ 39.976214][ T4217] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 [ 39.978769][ T4217] Call trace: [ 39.979584][ T4217] dump_backtrace+0x1c8/0x1f4 [ 39.980709][ T4217] show_stack+0x2c/0x3c [ 39.981733][ T4217] dump_stack_lvl+0x108/0x170 [ 39.982871][ T4217] dump_stack+0x1c/0x58 [ 39.983921][ T4217] __might_resched+0x37c/0x4d8 [ 39.985155][ T4217] __might_sleep+0x90/0xe4 [ 39.986282][ T4217] __kmem_cache_alloc_node+0x74/0x388 [ 39.987687][ T4217] __kmalloc_node+0xcc/0x1d0 [ 39.988854][ T4217] kvmalloc_node+0x84/0x1e4 [ 39.990058][ T4217] get_dist_table+0xa0/0x354 [ 39.991282][ T4217] netem_change+0x7a4/0x1900 [ 39.992476][ T4217] netem_init+0x54/0xb8 [ 39.993586][ T4217] qdisc_create+0x70c/0xe64 [ 39.994738][ T4217] tc_modify_qdisc+0x9f0/0x1840 [ 39.996025][ T4217] rtnetlink_rcv_msg+0x72c/0xd94 [ 39.997340][ T4217] netlink_rcv_skb+0x20c/0x3b8 [ 39.998606][ T4217] rtnetlink_rcv+0x28/0x38 [ 39.999791][ T4217] netlink_unicast+0x660/0x8d4 [ 40.001164][ T4217] netlink_sendmsg+0x834/0xb18 [ 40.002495][ T4217] ____sys_sendmsg+0x558/0x844 [ 40.003779][ T4217] __sys_sendmsg+0x26c/0x33c [ 40.004980][ T4217] __arm64_sys_sendmsg+0x80/0x94 [ 40.006300][ T4217] invoke_syscall+0x98/0x2c0 [ 40.007466][ T4217] el0_svc_common+0x138/0x258 [ 40.008690][ T4217] do_el0_svc+0x64/0x218 [ 40.009783][ T4217] el0_svc+0x58/0x168 [ 40.010822][ T4217] el0t_64_sync_handler+0x84/0xf0 [ 40.012127][ T4217] el0t_64_sync+0x18c/0x190 [ 40.013429][ T4217] [ 40.014040][ T4217] ============================================ [ 40.015708][ T4217] WARNING: possible recursive locking detected [ 40.017334][ T4217] 6.1.45-syzkaller #0 Tainted: G W [ 40.019043][ T4217] -------------------------------------------- [ 40.020693][ T4217] syz-executor421/4217 is trying to acquire lock: [ 40.022354][ T4217] ffff0000d4f6e908 (&sch->q.lock){+...}-{2:2}, at: get_dist_table+0x240/0x354 [ 40.024711][ T4217] [ 40.024711][ T4217] but task is already holding lock: [ 40.026617][ T4217] ffff0000d4f6e908 (&sch->q.lock){+...}-{2:2}, at: sch_tree_lock+0x120/0x1d4 [ 40.028911][ T4217] [ 40.028911][ T4217] other info that might help us debug this: [ 40.030995][ T4217] Possible unsafe locking scenario: [ 40.030995][ T4217] [ 40.032967][ T4217] CPU0 [ 40.033853][ T4217] ---- [ 40.034754][ T4217] lock(&sch->q.lock); [ 40.035848][ T4217] lock(&sch->q.lock); [ 40.036921][ T4217] [ 40.036921][ T4217] *** DEADLOCK *** [ 40.036921][ T4217] [ 40.039037][ T4217] May be due to missing lock nesting notation [ 40.039037][ T4217] [ 40.041187][ T4217] 2 locks held by syz-executor421/4217: [ 40.042630][ T4217] #0: ffff800017e6fdc8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e8/0xd94 [ 40.045124][ T4217] #1: ffff0000d4f6e908 (&sch->q.lock){+...}-{2:2}, at: sch_tree_lock+0x120/0x1d4 [ 40.047657][ T4217] [ 40.047657][ T4217] stack backtrace: [ 40.049173][ T4217] CPU: 1 PID: 4217 Comm: syz-executor421 Tainted: G W 6.1.45-syzkaller #0 [ 40.051776][ T4217] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 [ 40.054451][ T4217] Call trace: [ 40.055289][ T4217] dump_backtrace+0x1c8/0x1f4 [ 40.056496][ T4217] show_stack+0x2c/0x3c [ 40.057594][ T4217] dump_stack_lvl+0x108/0x170 [ 40.058780][ T4217] dump_stack+0x1c/0x58 [ 40.059833][ T4217] __lock_acquire+0x6310/0x764c [ 40.061073][ T4217] lock_acquire+0x26c/0x7cc [ 40.062221][ T4217] _raw_spin_lock_bh+0x54/0x6c [ 40.063445][ T4217] get_dist_table+0x240/0x354 [ 40.064666][ T4217] netem_change+0x7a4/0x1900 [ 40.065916][ T4217] netem_init+0x54/0xb8 [ 40.067038][ T4217] qdisc_create+0x70c/0xe64 [ 40.068178][ T4217] tc_modify_qdisc+0x9f0/0x1840 [ 40.069456][ T4217] rtnetlink_rcv_msg+0x72c/0xd94 [ 40.070724][ T4217] netlink_rcv_skb+0x20c/0x3b8 [ 40.071960][ T4217] rtnetlink_rcv+0x28/0x38 [ 40.073160][ T4217] netlink_unicast+0x660/0x8d4 [ 40.074406][ T4217] netlink_sendmsg+0x834/0xb18 [ 40.075644][ T4217] ____sys_sendmsg+0x558/0x844 [ 40.076905][ T4217] __sys_sendmsg+0x26c/0x33c [ 40.078065][ T4217] __arm64_sys_sendmsg+0x80/0x94 [ 40.079305][ T4217] invoke_syscall+0x98/0x2c0 [ 40.080459][ T4217] el0_svc_common+0x138/0x258 [ 40.081646][ T4217] do_el0_svc+0x64/0x218 [ 40.082733][ T4217] el0_svc+0x58/0x168 [ 40.083753][ T4217] el0t_64_sync_handler+0x84/0xf0 [ 40.085107][ T4217] el0t_64_sync+0x18c/0x190