INFO: task syz.1.7330:24328 blocked for more than 430 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.7330      state:D stack:0     pid:24328 tgid:24327 ppid:3274   task_flags:0x400140 flags:0x00000003
Call Trace:
[<ffffffff86486fbc>] context_switch kernel/sched/core.c:5325 [inline]
[<ffffffff86486fbc>] __schedule+0x1042/0x4114 kernel/sched/core.c:6929
[<ffffffff8648a152>] __schedule_loop kernel/sched/core.c:7011 [inline]
[<ffffffff8648a152>] schedule+0xc4/0x35e kernel/sched/core.c:7026
[<ffffffff8649fbea>] schedule_timeout+0x1c6/0x2ae kernel/time/sleep_timeout.c:75
[<ffffffff8648bd02>] do_wait_for_common kernel/sched/completion.c:100 [inline]
[<ffffffff8648bd02>] __wait_for_common+0x1d2/0x3e8 kernel/sched/completion.c:121
[<ffffffff8648bf32>] wait_for_common kernel/sched/completion.c:132 [inline]
[<ffffffff8648bf32>] wait_for_completion+0x1a/0x22 kernel/sched/completion.c:153
[<ffffffff8470c69a>] disable_device+0x1b2/0x2ba drivers/infiniband/core/device.c:1325
[<ffffffff8470ca30>] __ib_unregister_device+0x28e/0x402 drivers/infiniband/core/device.c:1555
[<ffffffff8470cc70>] ib_unregister_device_and_put+0x56/0x82 drivers/infiniband/core/device.c:1620
[<ffffffff84767624>] nldev_dellink+0x220/0x32c drivers/infiniband/core/nldev.c:1827
[<ffffffff8471c098>] rdma_nl_rcv_msg+0x352/0x680 drivers/infiniband/core/netlink.c:195
[<ffffffff8471c6d0>] rdma_nl_rcv_skb.constprop.0.isra.0+0x30a/0x406 drivers/infiniband/core/netlink.c:239
[<ffffffff8471c7e6>] rdma_nl_rcv+0x1a/0x24 drivers/infiniband/core/netlink.c:259
[<ffffffff8564675e>] netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
[<ffffffff8564675e>] netlink_unicast+0x544/0x88a net/netlink/af_netlink.c:1346
[<ffffffff856472f4>] netlink_sendmsg+0x850/0xdc8 net/netlink/af_netlink.c:1896
[<ffffffff851a9b8a>] sock_sendmsg_nosec net/socket.c:727 [inline]
[<ffffffff851a9b8a>] __sock_sendmsg+0xcc/0x160 net/socket.c:742
[<ffffffff851aa83e>] ____sys_sendmsg+0x640/0x79e net/socket.c:2630
[<ffffffff851b457e>] ___sys_sendmsg+0x144/0x1e6 net/socket.c:2684
[<ffffffff851b565a>] __sys_sendmsg+0x188/0x246 net/socket.c:2716
[<ffffffff851b5788>] __do_sys_sendmsg net/socket.c:2721 [inline]
[<ffffffff851b5788>] __se_sys_sendmsg net/socket.c:2719 [inline]
[<ffffffff851b5788>] __riscv_sys_sendmsg+0x70/0xa2 net/socket.c:2719
[<ffffffff800770dc>] syscall_handler+0x94/0x118 arch/riscv/include/asm/syscall.h:112
[<ffffffff8647c64e>] do_trap_ecall_u+0x39e/0x53a arch/riscv/kernel/traps.c:343
[<ffffffff864a5f52>] handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:198

Showing all locks held in the system:
1 lock held by khungtaskd/36:
 #0: ffffffff885df120 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2a/0x1a0 kernel/locking/lockdep.c:6771
1 lock held by kcompactd0/40:
 #0: ffffaf806ed15198 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:638 [inline]
 #0: ffffaf806ed15198 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1546 [inline]
 #0: ffffaf806ed15198 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1868 [inline]
 #0: ffffaf806ed15198 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x310/0x4114 kernel/sched/core.c:6833
2 locks held by getty/3163:
 #0: ffffaf801d87f0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3a/0x46 drivers/tty/tty_ldsem.c:340
 #1: ffff8f800008e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x3e4/0x12b6 drivers/tty/n_tty.c:2222
2 locks held by syz-executor/3191:
2 locks held by syz.1.7330/24328:
 #0: ffffffff912ae678 (&rdma_nl_types[idx].sem){.+.+}-{4:4}, at: rdma_nl_rcv_msg+0x172/0x680 drivers/infiniband/core/netlink.c:164
 #1: ffffaf80333b8700 (&device->unregistration_lock){+.+.}-{4:4}, at: __ib_unregister_device+0x200/0x402 drivers/infiniband/core/device.c:1551
4 locks held by syz-executor/24394:
2 locks held by syz.2.7370/24636:
 #0: ffffffff89a9cd70 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x26e/0x5fe net/core/net_namespace.c:576
 #1: ffffaf80333b8700 (&device->unregistration_lock){+.+.}-{4:4}, at: rdma_dev_change_netns+0x3c/0x348 drivers/infiniband/core/device.c:1703
2 locks held by kworker/0:5/24813:
2 locks held by syz.4.7447/25350:

=============================================

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 36 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT 
Hardware name: riscv-virtio,qemu (DT)
Call Trace:
[<ffffffff8007941a>] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:132
[<ffffffff8000329a>] show_stack+0x30/0x3c arch/riscv/kernel/stacktrace.c:138
[<ffffffff80060c50>] __dump_stack lib/dump_stack.c:94 [inline]
[<ffffffff80060c50>] dump_stack_lvl+0x12a/0x1a2 lib/dump_stack.c:120
[<ffffffff80060ce4>] dump_stack+0x1c/0x24 lib/dump_stack.c:129
[<ffffffff8643e12e>] nmi_cpu_backtrace+0x3b0/0x3b2 lib/nmi_backtrace.c:113
[<ffffffff8643e3e6>] nmi_trigger_cpumask_backtrace+0x2b6/0x45a lib/nmi_backtrace.c:62
[<ffffffff80087228>] arch_trigger_cpumask_backtrace+0x2c/0x3c arch/riscv/kernel/smp.c:350
[<ffffffff80506126>] trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
[<ffffffff80506126>] check_hung_uninterruptible_tasks kernel/hung_task.c:332 [inline]
[<ffffffff80506126>] watchdog+0xf58/0x11ac kernel/hung_task.c:495
[<ffffffff801e7768>] kthread+0x39c/0x7d6 kernel/kthread.c:463
[<ffffffff800699de>] ret_from_fork_kernel+0x2a/0xbc6 arch/riscv/kernel/process.c:214
[<ffffffff864a6072>] ret_from_fork_kernel_asm+0x16/0x18 arch/riscv/kernel/entry.S:328
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 3015 Comm: klogd Not tainted syzkaller #0 PREEMPT 
Hardware name: riscv-virtio,qemu (DT)
epc : lock_is_held_type+0x146/0x1e8 kernel/locking/lockdep.c:5944
 ra : lockdep_recursion_finish kernel/locking/lockdep.c:470 [inline]
 ra : lock_is_held_type+0x114/0x1e8 kernel/locking/lockdep.c:5941
epc : ffffffff8647d296 ra : ffffffff8647d264 sp : ffff8f8007786c30
 gp : ffffffff89eb7800 tp : ffffaf801ccb0000 t0 : ffff8f8007786c40
 t1 : fffff5ef03996120 t2 : 1ffff1f000ef0e28 s0 : ffff8f8007786c90
 s1 : ffffffff912828a8 a0 : 0000000000000001 a1 : 0000000000000000
 a2 : 0000000000000000 a3 : ffffffff8181f8ea a4 : 0000000000000000
 a5 : 0000000000000000 a6 : 0000000000000003 a7 : ffffaf801ccb0900
 s2 : ffffaf806ecff708 s3 : 0000000000000000 s4 : ffffaf801ccb1000
 s5 : ffffffffffffffff s6 : 0000000000000002 s7 : ffffffff8685f708
 s8 : ffffffff912828a0 s9 : 0000000000000000 s10: ffff8d8000f69500
 s11: ffffaf8072fef0c0 t3 : 4b952e4d00000000 t4 : fffff5ef03996120
 t5 : fffff5ef03996121 t6 : 0000000000000000
status: 0000000200000120 badaddr: 0000000000000000 cause: 8000000000000001
[<ffffffff8647d296>] arch_local_irq_restore arch/riscv/include/asm/irqflags.h:51 [inline]
[<ffffffff8647d296>] lock_is_held_type+0x146/0x1e8 kernel/locking/lockdep.c:5942
[<ffffffff81ab0efa>] lock_is_held include/linux/lockdep.h:249 [inline]
[<ffffffff81ab0efa>] depot_fetch_stack+0x74/0xa6 lib/stackdepot.c:497
[<ffffffff81ab1c74>] __stack_depot_get_stack_record+0xe/0x1e lib/stackdepot.c:749
[<ffffffff80be278a>] inc_stack_record_count mm/page_owner.c:197 [inline]
[<ffffffff80be278a>] __set_page_owner+0x126/0x4a8 mm/page_owner.c:333
[<ffffffff80a7a082>] set_page_owner include/linux/page_owner.h:32 [inline]
[<ffffffff80a7a082>] post_alloc_hook+0xdc/0x1ba mm/page_alloc.c:1850
[<ffffffff80a80348>] prep_new_page mm/page_alloc.c:1858 [inline]
[<ffffffff80a80348>] get_page_from_freelist+0xdfc/0x3672 mm/page_alloc.c:3884
[<ffffffff80a836ee>] __alloc_frozen_pages_noprof+0x22e/0x2124 mm/page_alloc.c:5183
[<ffffffff80b26560>] alloc_pages_mpol+0x1fa/0x5be mm/mempolicy.c:2416
[<ffffffff80b27df2>] alloc_frozen_pages_noprof+0x174/0x2f0 mm/mempolicy.c:2487
[<ffffffff80aa0b6e>] alloc_slab_page mm/slub.c:3039 [inline]
[<ffffffff80aa0b6e>] allocate_slab mm/slub.c:3212 [inline]
[<ffffffff80aa0b6e>] new_slab+0x2fe/0x3a4 mm/slub.c:3266
[<ffffffff80aa1872>] ___slab_alloc+0xc5e/0x15ee mm/slub.c:4636
[<ffffffff80aa2274>] __slab_alloc.constprop.0+0x72/0x118 mm/slub.c:4755
[<ffffffff80aadef4>] __slab_alloc_node mm/slub.c:4831 [inline]
[<ffffffff80aadef4>] slab_alloc_node mm/slub.c:5253 [inline]
[<ffffffff80aadef4>] __do_kmalloc_node mm/slub.c:5626 [inline]
[<ffffffff80aadef4>] __kmalloc_node_track_caller_noprof+0x41c/0x934 mm/slub.c:5736
[<ffffffff851d858a>] kmalloc_reserve+0xfe/0x2be net/core/skbuff.c:601
[<ffffffff851e9eca>] __alloc_skb+0x154/0x438 net/core/skbuff.c:670
[<ffffffff851fee66>] alloc_skb include/linux/skbuff.h:1383 [inline]
[<ffffffff851fee66>] alloc_skb_with_frags+0xe2/0x838 net/core/skbuff.c:6671
[<ffffffff851bf8de>] sock_alloc_send_pskb+0x6e2/0x82a net/core/sock.c:2965
[<ffffffff85d09b2a>] unix_dgram_sendmsg+0x370/0x1586 net/unix/af_unix.c:2153
[<ffffffff851a9b8a>] sock_sendmsg_nosec net/socket.c:727 [inline]
[<ffffffff851a9b8a>] __sock_sendmsg+0xcc/0x160 net/socket.c:742
[<ffffffff851b2df6>] __sys_sendto+0x27a/0x34e net/socket.c:2244
[<ffffffff851b2f8a>] __do_sys_sendto net/socket.c:2251 [inline]
[<ffffffff851b2f8a>] __se_sys_sendto net/socket.c:2247 [inline]
[<ffffffff851b2f8a>] __riscv_sys_sendto+0xc0/0x158 net/socket.c:2247
[<ffffffff800770dc>] syscall_handler+0x94/0x118 arch/riscv/include/asm/syscall.h:112
[<ffffffff8647c64e>] do_trap_ecall_u+0x39e/0x53a arch/riscv/kernel/traps.c:343
[<ffffffff864a5f52>] handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:198