===================================================== WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected 5.15.126-syzkaller #0 Not tainted ----------------------------------------------------- syz-executor361/3488 [HC0[0]:SC0[2]:HE1:SE0] is trying to acquire: ffffffff8c9dfba0 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:206 [inline] ffffffff8c9dfba0 (fs_reclaim){+.+.}-{0:0}, at: slab_pre_alloc_hook+0x22/0xc0 mm/slab.h:492 and this task is already holding: ffffffff8da20808 (noop_qdisc.q.lock){+.-.}-{2:2}, at: netem_change+0x257/0x20c0 net/sched/sch_netem.c:972 which would create a new lock dependency: (noop_qdisc.q.lock){+.-.}-{2:2} -> (fs_reclaim){+.+.}-{0:0} but this new dependency connects a SOFTIRQ-irq-safe lock: (noop_qdisc.q.lock){+.-.}-{2:2} ... which became SOFTIRQ-irq-safe at: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:363 [inline] net_tx_action+0x6c5/0x8e0 net/core/dev.c:5049 __do_softirq+0x3b3/0x93a kernel/softirq.c:558 do_softirq+0x162/0x240 kernel/softirq.c:459 __local_bh_enable_ip+0x1b1/0x1f0 kernel/softirq.c:383 netif_tx_unlock_bh include/linux/netdevice.h:4545 [inline] dev_watchdog_down net/sched/sch_generic.c:514 [inline] dev_deactivate_many+0x524/0xbf0 net/sched/sch_generic.c:1302 dev_deactivate+0x177/0x270 net/sched/sch_generic.c:1336 linkwatch_do_dev+0x104/0x160 net/core/link_watch.c:165 __linkwatch_run_queue+0x4ca/0x7f0 net/core/link_watch.c:213 linkwatch_event+0x48/0x50 net/core/link_watch.c:252 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 to a SOFTIRQ-irq-unsafe lock: (fs_reclaim){+.+.}-{0:0} ... which became SOFTIRQ-irq-unsafe at: ... lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 __fs_reclaim_acquire mm/page_alloc.c:4547 [inline] fs_reclaim_acquire+0x83/0x120 mm/page_alloc.c:4561 might_alloc include/linux/sched/mm.h:206 [inline] slab_pre_alloc_hook+0x22/0xc0 mm/slab.h:492 slab_alloc_node mm/slub.c:3134 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc_trace+0x49/0x290 mm/slub.c:3245 kmalloc include/linux/slab.h:591 [inline] kzalloc include/linux/slab.h:721 [inline] alloc_workqueue_attrs kernel/workqueue.c:3406 [inline] wq_numa_init+0x122/0x49f kernel/workqueue.c:5997 workqueue_init+0x18/0x5e1 kernel/workqueue.c:6124 kernel_init_freeable+0x40a/0x5c5 init/main.c:1592 kernel_init+0x19/0x290 init/main.c:1499 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 other info that might help us debug this: Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(fs_reclaim); local_irq_disable(); lock(noop_qdisc.q.lock); lock(fs_reclaim); lock(noop_qdisc.q.lock); *** DEADLOCK *** 2 locks held by syz-executor361/3488: #0: ffffffff8d9e1148 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff8d9e1148 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x94c/0xee0 net/core/rtnetlink.c:5600 #1: ffffffff8da20808 (noop_qdisc.q.lock){+.-.}-{2:2}, at: netem_change+0x257/0x20c0 net/sched/sch_netem.c:972 the dependencies between SOFTIRQ-irq-safe lock and the holding lock: -> (noop_qdisc.q.lock){+.-.}-{2:2} { HARDIRQ-ON-W at: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:363 [inline] __dev_xmit_skb net/core/dev.c:3848 [inline] __dev_queue_xmit+0xad6/0x3230 net/core/dev.c:4190 tx+0x64/0x100 drivers/block/aoe/aoenet.c:63 kthread+0x234/0x440 drivers/block/aoe/aoecmd.c:1230 kthread+0x3f6/0x4f0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 IN-SOFTIRQ-W at: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:363 [inline] net_tx_action+0x6c5/0x8e0 net/core/dev.c:5049 __do_softirq+0x3b3/0x93a kernel/softirq.c:558 do_softirq+0x162/0x240 kernel/softirq.c:459 __local_bh_enable_ip+0x1b1/0x1f0 kernel/softirq.c:383 netif_tx_unlock_bh include/linux/netdevice.h:4545 [inline] dev_watchdog_down net/sched/sch_generic.c:514 [inline] dev_deactivate_many+0x524/0xbf0 net/sched/sch_generic.c:1302 dev_deactivate+0x177/0x270 net/sched/sch_generic.c:1336 linkwatch_do_dev+0x104/0x160 net/core/link_watch.c:165 __linkwatch_run_queue+0x4ca/0x7f0 net/core/link_watch.c:213 linkwatch_event+0x48/0x50 net/core/link_watch.c:252 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 INITIAL USE at: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:363 [inline] __dev_xmit_skb net/core/dev.c:3848 [inline] __dev_queue_xmit+0xad6/0x3230 net/core/dev.c:4190 tx+0x64/0x100 drivers/block/aoe/aoenet.c:63 kthread+0x234/0x440 drivers/block/aoe/aoecmd.c:1230 kthread+0x3f6/0x4f0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 } ... key at: [] noop_qdisc+0x108/0x320 the dependencies between the lock to be acquired and SOFTIRQ-irq-unsafe lock: -> (fs_reclaim){+.+.}-{0:0} { HARDIRQ-ON-W at: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 __fs_reclaim_acquire mm/page_alloc.c:4547 [inline] fs_reclaim_acquire+0x83/0x120 mm/page_alloc.c:4561 might_alloc include/linux/sched/mm.h:206 [inline] slab_pre_alloc_hook+0x22/0xc0 mm/slab.h:492 slab_alloc_node mm/slub.c:3134 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc_trace+0x49/0x290 mm/slub.c:3245 kmalloc include/linux/slab.h:591 [inline] kzalloc include/linux/slab.h:721 [inline] alloc_workqueue_attrs kernel/workqueue.c:3406 [inline] wq_numa_init+0x122/0x49f kernel/workqueue.c:5997 workqueue_init+0x18/0x5e1 kernel/workqueue.c:6124 kernel_init_freeable+0x40a/0x5c5 init/main.c:1592 kernel_init+0x19/0x290 init/main.c:1499 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 SOFTIRQ-ON-W at: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 __fs_reclaim_acquire mm/page_alloc.c:4547 [inline] fs_reclaim_acquire+0x83/0x120 mm/page_alloc.c:4561 might_alloc include/linux/sched/mm.h:206 [inline] slab_pre_alloc_hook+0x22/0xc0 mm/slab.h:492 slab_alloc_node mm/slub.c:3134 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc_trace+0x49/0x290 mm/slub.c:3245 kmalloc include/linux/slab.h:591 [inline] kzalloc include/linux/slab.h:721 [inline] alloc_workqueue_attrs kernel/workqueue.c:3406 [inline] wq_numa_init+0x122/0x49f kernel/workqueue.c:5997 workqueue_init+0x18/0x5e1 kernel/workqueue.c:6124 kernel_init_freeable+0x40a/0x5c5 init/main.c:1592 kernel_init+0x19/0x290 init/main.c:1499 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 INITIAL USE at: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 __fs_reclaim_acquire mm/page_alloc.c:4547 [inline] fs_reclaim_acquire+0x83/0x120 mm/page_alloc.c:4561 might_alloc include/linux/sched/mm.h:206 [inline] slab_pre_alloc_hook+0x22/0xc0 mm/slab.h:492 slab_alloc_node mm/slub.c:3134 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc_trace+0x49/0x290 mm/slub.c:3245 kmalloc include/linux/slab.h:591 [inline] kzalloc include/linux/slab.h:721 [inline] alloc_workqueue_attrs kernel/workqueue.c:3406 [inline] wq_numa_init+0x122/0x49f kernel/workqueue.c:5997 workqueue_init+0x18/0x5e1 kernel/workqueue.c:6124 kernel_init_freeable+0x40a/0x5c5 init/main.c:1592 kernel_init+0x19/0x290 init/main.c:1499 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 } ... key at: [] __fs_reclaim_map+0x0/0x160 ... acquired at: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 __fs_reclaim_acquire mm/page_alloc.c:4547 [inline] fs_reclaim_acquire+0x83/0x120 mm/page_alloc.c:4561 might_alloc include/linux/sched/mm.h:206 [inline] slab_pre_alloc_hook+0x22/0xc0 mm/slab.h:492 slab_alloc_node mm/slub.c:3134 [inline] __kmalloc_node+0x71/0x390 mm/slub.c:4451 kmalloc_node include/linux/slab.h:614 [inline] kvmalloc_node+0x80/0x140 mm/util.c:619 kvmalloc include/linux/mm.h:805 [inline] get_dist_table+0x83/0x2c0 net/sched/sch_netem.c:788 netem_change+0xa05/0x20c0 net/sched/sch_netem.c:988 netem_init+0x58/0xb0 net/sched/sch_netem.c:1075 qdisc_create+0x8ae/0x1390 net/sched/sch_api.c:1264 tc_modify_qdisc+0xac5/0x1710 rtnetlink_rcv_msg+0x993/0xee0 net/core/rtnetlink.c:5603 netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2505 netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline] netlink_unicast+0x7b6/0x980 net/netlink/af_netlink.c:1356 netlink_sendmsg+0xa30/0xd60 net/netlink/af_netlink.c:1924 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg net/socket.c:724 [inline] ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2412 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2466 __sys_sendmsg net/socket.c:2495 [inline] __do_sys_sendmsg net/socket.c:2504 [inline] __se_sys_sendmsg+0x19a/0x260 net/socket.c:2502 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb stack backtrace: CPU: 0 PID: 3488 Comm: syz-executor361 Not tainted 5.15.126-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_bad_irq_dependency kernel/locking/lockdep.c:2567 [inline] check_irq_usage kernel/locking/lockdep.c:2806 [inline] check_prev_add kernel/locking/lockdep.c:3057 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x4cfe/0x58b0 kernel/locking/lockdep.c:3787 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5011 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 __fs_reclaim_acquire mm/page_alloc.c:4547 [inline] fs_reclaim_acquire+0x83/0x120 mm/page_alloc.c:4561 might_alloc include/linux/sched/mm.h:206 [inline] slab_pre_alloc_hook+0x22/0xc0 mm/slab.h:492 slab_alloc_node mm/slub.c:3134 [inline] __kmalloc_node+0x71/0x390 mm/slub.c:4451 kmalloc_node include/linux/slab.h:614 [inline] kvmalloc_node+0x80/0x140 mm/util.c:619 kvmalloc include/linux/mm.h:805 [inline] get_dist_table+0x83/0x2c0 net/sched/sch_netem.c:788 netem_change+0xa05/0x20c0 net/sched/sch_netem.c:988 netem_init+0x58/0xb0 net/sched/sch_netem.c:1075 qdisc_create+0x8ae/0x1390 net/sched/sch_api.c:1264 tc_modify_qdisc+0xac5/0x1710 rtnetlink_rcv_msg+0x993/0xee0 net/core/rtnetlink.c:5603 netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2505 netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline] netlink_unicast+0x7b6/0x980 net/netlink/af_netlink.c:1356 netlink_sendmsg+0xa30/0xd60 net/netlink/af_netlink.c:1924 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg net/socket.c:724 [inline] ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2412 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2466 __sys_sendmsg net/socket.c:2495 [inline] __do_sys_sendmsg net/socket.c:2504 [inline] __se_sys_sendmsg+0x19a/0x260 net/socket.c:2502 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f227b4404e9 Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff1d945018 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fff1d9451e8 RCX: 00007f227b4404e9 RDX: 0000000000000000 RSI: 00000000200007c0 RDI: 0000000000000003 RBP: 00007f227b4b3610 R08: 00000000ffffffff R09: 00007fff1d9451e8 R10: 000000000000473c R11: 0000000000000246 R12: 0000000000000001 R13: 00007fff1d9451d8 R14: 0000000000000001 R15: 0000000000000001 BUG: sleeping function called from invalid context at include/linux/sched/mm.h:209 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 3488, name: syz-executor361 INFO: lockdep is turned off. Preemption disabled at: [<0000000000000000>] 0x0 CPU: 0 PID: 3488 Comm: syz-executor361 Not tainted 5.15.126-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 ___might_sleep+0x547/0x6a0 kernel/sched/core.c:9625 might_alloc include/linux/sched/mm.h:209 [inline] slab_pre_alloc_hook+0x44/0xc0 mm/slab.h:492 slab_alloc_node mm/slub.c:3134 [inline] __kmalloc_node+0x71/0x390 mm/slub.c:4451 kmalloc_node include/linux/slab.h:614 [inline] kvmalloc_node+0x80/0x140 mm/util.c:619 kvmalloc include/linux/mm.h:805 [inline] get_dist_table+0x83/0x2c0 net/sched/sch_netem.c:788 netem_change+0xa05/0x20c0 net/sched/sch_netem.c:988 netem_init+0x58/0xb0 net/sched/sch_netem.c:1075 qdisc_create+0x8ae/0x1390 net/sched/sch_api.c:1264 tc_modify_qdisc+0xac5/0x1710 rtnetlink_rcv_msg+0x993/0xee0 net/core/rtnetlink.c:5603 netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2505 netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline] netlink_unicast+0x7b6/0x980 net/netlink/af_netlink.c:1356 netlink_sendmsg+0xa30/0xd60 net/netlink/af_netlink.c:1924 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg net/socket.c:724 [inline] ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2412 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2466 __sys_sendmsg net/socket.c:2495 [inline] __do_sys_sendmsg net/socket.c:2504 [inline] __se_sys_sendmsg+0x19a/0x260 net/socket.c:2502 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f227b4404e9 Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff1d945018 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fff1d9451e8 RCX: 00007f227b4404e9 RDX: 0000000000000000 RSI: 00000000200007c0 RDI: 0000000000000003 RBP: 00007f227b4b3610 R08: 00000000ffffffff R09: 00007fff1d9451e8 R10: 000000000000473c R11: 0000000000000246 R12: 0000000000000001 R13: 00007fff1d9451d8 R14: 0000000000000001 R15: 0000000000000001