INFO: task hung in rdma_dev_exit_net (6)

Status: upstream: reported on 2024/12/20 08:21
Subsystems: rdma
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+3658758f38a2f0f062e7@syzkaller.appspotmail.com
First crash: 884d, last: 55m
▶ ▼ ✨ AI Jobs (2)
ID Workflow Result Correct Bug Created Started Finished Revision
686f3e2b repro-c Reproduced: ✅ ❓ INFO: task hung in rdma_dev_exit_net (6) 2026/08/05 17:32 2026/08/06 19:49 2026/08/06 22:02 c38879ea
5b0cadc8 assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ✅ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ INFO: task hung in rdma_dev_exit_net (6) 2026/05/25 00:40 2026/05/25 00:40 2026/05/25 01:47 c69befb3
▶ ▼ Discussions (18)
Title Replies (including bot) Last reply
[syzbot] Monthly rdma report (Sep 2026) 0 (1) 2026/09/30 20:33
[syzbot] Monthly rdma report (Aug 2026) 0 (1) 2026/08/30 20:33
[syzbot] Monthly rdma report (Jun 2026) 0 (1) 2026/06/29 12:32
[syzbot] Monthly rdma report (May 2026) 0 (1) 2026/05/29 12:32
[syzbot] Monthly rdma report (Apr 2026) 0 (1) 2026/04/28 08:56
[syzbot] Monthly rdma report (Mar 2026) 0 (1) 2026/03/27 20:36
[syzbot] Monthly rdma report (Feb 2026) 0 (1) 2026/02/24 20:42
[syzbot] Monthly rdma report (Jan 2026) 0 (1) 2026/01/25 07:57
[syzbot] Monthly rdma report (Dec 2025) 0 (1) 2025/12/24 05:31
[syzbot] Monthly rdma report (Nov 2025) 0 (1) 2025/11/24 07:46
[syzbot] Monthly rdma report (Oct 2025) 1 (2) 2025/10/23 19:05
[syzbot] Monthly rdma report (Sep 2025) 0 (1) 2025/09/21 22:02
[syzbot] Monthly rdma report (Aug 2025) 0 (1) 2025/08/21 12:33
[syzbot] Monthly rdma report (Jun 2025) 3 (4) 2025/06/20 15:56
[syzbot] Monthly rdma report (May 2025) 0 (1) 2025/05/19 13:37
[syzbot] Monthly rdma report (Mar 2025) 0 (1) 2025/03/02 22:37
[syzbot] Monthly rdma report (Jan 2025) 0 (1) 2025/01/30 13:12
[syzbot] [rdma?] INFO: task hung in rdma_dev_exit_net (6) 0 (1) 2024/12/20 08:21
▶ ▼ Similar bugs (7)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in rdma_dev_exit_net (2) rdma 1 6 2076d 2210d 0/29 auto-closed as invalid on 2021/05/10 22:49
upstream INFO: task hung in rdma_dev_exit_net (3) rdma 1 5 1824d 1859d 0/29 auto-closed as invalid on 2022/01/17 19:05
upstream INFO: task hung in rdma_dev_exit_net rdma 1 1 2369d 2369d 0/29 auto-closed as invalid on 2020/07/21 12:21
upstream INFO: task hung in rdma_dev_exit_net (5) rdma 1 4 1000d 1015d 0/29 auto-obsoleted due to no activity on 2024/04/21 00:36
linux-6.6 INFO: task hung in rdma_dev_exit_net 1 2 1d03h 3d08h 0/2 upstream: reported on 2026/10/15 02:19
linux-5.15 INFO: task hung in rdma_dev_exit_net 1 1 389d 389d 0/3 auto-obsoleted due to no activity on 2026/01/02 06:39
upstream INFO: task hung in rdma_dev_exit_net (4) rdma 1 7 1198d 1361d 0/29 auto-obsoleted due to no activity on 2023/10/05 19:47
▶ ▼ Last patch testing requests (1)
Created Duration User Patch Repo Result
2026/08/07 08:07 2h52m nogikh@google.com upstream report log

Sample crash report:
INFO: task syz-executor:23471 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:24264 pid:23471 tgid:23471 ppid:1      task_flags:0x400140 flags:0x00080003
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5533 [inline]
 __schedule+0x1259/0x6920 kernel/sched/core.c:7284
 __schedule_loop kernel/sched/core.c:7361 [inline]
 schedule+0xdd/0x2c0 kernel/sched/core.c:7376
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7433
 rwsem_down_write_slowpath+0x4c2/0x12a0 kernel/locking/rwsem.c:1215
 __down_write_common kernel/locking/rwsem.c:1347 [inline]
 __down_write kernel/locking/rwsem.c:1356 [inline]
 down_write+0x1c0/0x1f0 kernel/locking/rwsem.c:1632
 rdma_dev_exit_net+0x174/0x6b0 drivers/infiniband/core/device.c:1156
 ops_exit_list net/core/net_namespace.c:200 [inline]
 ops_undo_list+0x2ee/0xab0 net/core/net_namespace.c:253
 setup_net+0x1fa/0x3a0 net/core/net_namespace.c:459
 copy_net_ns+0x345/0x7a0 net/core/net_namespace.c:582
 create_new_namespaces+0x3ea/0xac0 kernel/nsproxy.c:132
 unshare_nsproxy_namespaces+0xf2/0x220 kernel/nsproxy.c:234
 ksys_unshare+0x4a2/0xb30 kernel/fork.c:3307
 __do_sys_unshare kernel/fork.c:3375 [inline]
 __se_sys_unshare kernel/fork.c:3373 [inline]
 __x64_sys_unshare+0x31/0x40 kernel/fork.c:3373
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4f35b9f827
RSP: 002b:00007ffe8285bb38 EFLAGS: 00000202 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007f4f35e25f40 RCX: 00007f4f35b9f827
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
RBP: 00007f4f35e267b8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000008
R13: 0000000000000003 R14: 00007ffe8285bd78 R15: 0000000000000000
 </TASK>

Showing all locks held in the system:
locks held by khungtaskd/32: 1, last CPU#0:
 #0: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x3d/0x184 kernel/locking/lockdep.c:6871
locks held by kworker/u8:2/43: 2, on CPU#0:
 #0: ffff88801d094140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1466/0x1b10 kernel/workqueue.c:3371
 #1: ffffc90000b37d08 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3372
locks held by kworker/u8:5/130: 3, last CPU#0:
 #0: ffff88801d094140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1466/0x1b10 kernel/workqueue.c:3371
 #1: ffffc90002ec7d08 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3372
 #2: ffff88807c678258 (&devlink->lock_key#5){+.+.}-{4:4}, at: nsim_dev_trap_report_work+0x56/0xd20 drivers/net/netdevsim/dev.c:834
locks held by kworker/u8:6/504: 2, on CPU#0:
 #0: ffff88801d094140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1466/0x1b10 kernel/workqueue.c:3371
 #1: ffffc90003057d08 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3372
locks held by kworker/u8:8/1178: 4, last CPU#0:
 #0: ffff8880352e7140 ((wq_completion)bat_events){+.+.}-{0:0}, at: process_one_work+0x1466/0x1b10 kernel/workqueue.c:3371
 #1: ffffc9000544fd08 ((work_completion)(&(&forw_packet_aggr->delayed_work)->work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3372
 #2: ffff88802dcd81c8 (&hard_iface->bat_iv.ogm_buff_mutex){+.+.}-{4:4}, at: batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:1010 [inline]
 #2: ffff88802dcd81c8 (&hard_iface->bat_iv.ogm_buff_mutex){+.+.}-{4:4}, at: batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:1005 [inline]
 #2: ffff88802dcd81c8 (&hard_iface->bat_iv.ogm_buff_mutex){+.+.}-{4:4}, at: batadv_iv_send_outstanding_bat_ogm_packet+0x50f/0x7d0 net/batman-adv/bat_iv_ogm.c:1924
 #3: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #3: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #3: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: batadv_iv_ogm_slide_own_bcast_window net/batman-adv/bat_iv_ogm.c:870 [inline]
 #3: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: batadv_iv_ogm_schedule_buff+0x583/0x15d0 net/batman-adv/bat_iv_ogm.c:949
locks held by udevd/4967: 4, last CPU#0:
 #0: ffffffff8ff3ded0 (dup_mmap_sem){++++}-{0:0}, at: dup_mm kernel/fork.c:1542 [inline]
 #0: ffffffff8ff3ded0 (dup_mmap_sem){++++}-{0:0}, at: copy_mm kernel/fork.c:1595 [inline]
 #0: ffffffff8ff3ded0 (dup_mmap_sem){++++}-{0:0}, at: copy_process+0x5079/0x8430 kernel/fork.c:2321
 #1: ffff88807cf60340 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:562 [inline]
 #1: ffff88807cf60340 (&mm->mmap_lock){++++}-{4:4}, at: dup_mmap+0x127/0x2370 mm/mmap.c:1716
 #2: ffff88802b9bd900 (&mm->mmap_lock/1){+.+.}-{4:4}, at: mmap_write_lock_nested include/linux/mmap_lock.h:552 [inline]
 #2: ffff88802b9bd900 (&mm->mmap_lock/1){+.+.}-{4:4}, at: dup_mmap+0x1c9/0x2370 mm/mmap.c:1723
 #3: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #3: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #3: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x2f/0x310 mm/pgtable-generic.c:290
locks held by dhcpcd/5262: 1, on CPU#0:
 #0: ffffffff91cd5e00 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
 #0: ffffffff91cd5e00 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:366 [inline]
 #0: ffffffff91cd5e00 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0xac3/0x2620 net/core/rtnetlink.c:4219
locks held by getty/5354: 2, on CPU#1:
 #0: ffff888038bb00a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000323b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x419/0x14e0 drivers/tty/n_tty.c:2211
locks held by kworker/u8:9/6297: 4, on CPU#0:
 #0: ffff88801e2e0940 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x1466/0x1b10 kernel/workqueue.c:3371
 #1: ffffc9000b1afd08 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3372
 #2: ffffffff91cbd2c8 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xb8/0x920 net/core/net_namespace.c:677
 #3: ffffffff918e4428 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_exit_net+0x174/0x6b0 drivers/infiniband/core/device.c:1156
locks held by syz-executor/23364: 5, last CPU#0:
 #0: ffffffff9cce99a8
 (&rdma_nl_types[idx].sem){.+.+}-{4:4}, at: rdma_nl_rcv_msg+0x168/0x6f0 drivers/infiniband/core/netlink.c:164
 #1: ffffffff918f9de8 (link_ops_rwsem){++++}-{4:4}, at: nldev_newlink+0x2f0/0x630 drivers/infiniband/core/nldev.c:1848
 #2: ffffffff918e46a8 (devices_rwsem){++++}-{4:4}, at: enable_device_and_get+0x103/0x3f0 drivers/infiniband/core/device.c:1365
 #3: ffffffff918e4428 (rdma_nets_rwsem){++++}-{4:4}, at: add_compat_devs drivers/infiniband/core/device.c:1058 [inline]
 #3: ffffffff918e4428 (rdma_nets_rwsem){++++}-{4:4}, at: enable_device_and_get+0x2ce/0x3f0 drivers/infiniband/core/device.c:1381
 #4: ffff88807d019020 (&device->compat_devs_mutex){+.+.}-{4:4}, at: add_one_compat_dev+0x112/0x820 drivers/infiniband/core/device.c:976
locks held by kworker/u9:0/23365: 7, on CPU#0:
 #0: ffff88806a483140 ((wq_completion)hci13){+.+.}-{0:0}, at: process_one_work+0x1466/0x1b10 kernel/workqueue.c:3371
 #1: ffffc90004487d08 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3372
 #2: ffff8880607c4ea0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_cmd_sync_work+0x180/0x4c0 net/bluetooth/hci_sync.c:337
 #3: ffff8880607c40b8 (&hdev->lock){+.+.}-{4:4}, at: hci_abort_conn_sync+0x141/0xb20 net/bluetooth/hci_sync.c:6016
 #4: ffffffff91f57f00 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:2164 [inline]
 #4: ffffffff91f57f00 (hci_cb_list_lock){+.+.}-{4:4}, at: hci_conn_failed+0x11d/0x3c0 net/bluetooth/hci_conn.c:1442
 #5: ffff8880750992f8 (&conn->lock#2){+.+.}-{4:4}, at: l2cap_conn_del+0xa1/0x6c0 net/bluetooth/l2cap_core.c:1816
 #6: ffffffff8fdf84e8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x19e/0x3c0 kernel/rcu/tree_exp.h:343
locks held by syz-executor/23471: 2, on CPU#0:
 #0: ffffffff91cbd2c8 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x323/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff918e4428 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_exit_net+0x174/0x6b0 drivers/infiniband/core/device.c:1156
locks held by kworker/u8:3/23508: 2, on CPU#0:
 #0: ffff88801d094140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1466/0x1b10 kernel/workqueue.c:3371
 #1: ffffc90004c7fd08 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3372
locks held by syz-executor/23557: 1, last CPU#0:
 #0: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: lruvec_stat_mod_folio+0x76/0x2e0 mm/memcontrol.c:1028
locks held by syz-executor/23574: 3, on CPU#0:
 #0: ffffffff91cbd2c8 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x323/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91cd5e00 (rtnl_mutex){+.+.}-{4:4}, at: ip_tunnel_init_net+0x21e/0x780 net/ipv4/ip_tunnel.c:1136
 #2: ffff888053811530 (&idev->mc_lock){+.+.}-{4:4}, at: __ipv6_dev_mc_inc+0x53/0xc80 net/ipv6/mcast.c:963
locks held by syz-executor/23608: 3, on CPU#0:
 #0: ffffffff91cbd2c8 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x323/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff918e46a8 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x28c/0x590 drivers/infiniband/core/device.c:1221
 #2: ffffffff918e4428 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x2ff/0x590 drivers/infiniband/core/device.c:1226
locks held by syz-executor/23641: 3, on CPU#0:
 #0: ffffffff91cbd2c8 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x323/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff918e46a8 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x28c/0x590 drivers/infiniband/core/device.c:1221
 #2: ffffffff918e4428 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x2ff/0x590 drivers/infiniband/core/device.c:1226
locks held by syz-executor/23721: 3, on CPU#0:
 #0: ffffffff91cbd2c8 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x323/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff918e46a8 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x28c/0x590 drivers/infiniband/core/device.c:1221
 #2: ffffffff918e4428 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x2ff/0x590 drivers/infiniband/core/device.c:1226
locks held by kworker/0:3/23733: 3, last CPU#0:
 #0: ffff88801d059d40 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x1466/0x1b10 kernel/workqueue.c:3371
 #1: ffffc90000ae7d08 ((work_completion)(&(&gc_work->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3372
 #2: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #2: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #2: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: gc_worker+0x21a/0x1a10 net/netfilter/nf_conntrack_core.c:1532
locks held by kworker/0:4/23736: 2, last CPU#0:
 #0: ffff88801d059d40 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x1466/0x1b10 kernel/workqueue.c:3371
 #1: ffffc9000258fd08 ((gc_work).work){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3372
locks held by syz-executor/23753: 3, on CPU#0:
 #0: ffffffff91cbd2c8 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x323/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff918e46a8 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x28c/0x590 drivers/infiniband/core/device.c:1221
 #2: ffffffff918e4428 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x2ff/0x590 drivers/infiniband/core/device.c:1226
locks held by syz-executor/23761: 3, on CPU#0:
 #0: ffffffff91cbd2c8 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x323/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff918e46a8 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x28c/0x590 drivers/infiniband/core/device.c:1221
 #2: ffffffff918e4428 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x2ff/0x590 drivers/infiniband/core/device.c:1226
locks held by syz-executor/23787: 3, on CPU#0:
 #0: ffffffff91cbd2c8 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x323/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff918e46a8 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x28c/0x590 drivers/infiniband/core/device.c:1221
 #2: ffffffff918e4428 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x2ff/0x590 drivers/infiniband/core/device.c:1226
locks held by syz-executor/23828: 3, on CPU#0:
 #0: ffffffff91cbd2c8 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x323/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff918e46a8 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x28c/0x590 drivers/infiniband/core/device.c:1221
 #2: ffffffff918e4428 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x2ff/0x590 drivers/infiniband/core/device.c:1226
locks held by syz-executor/23847: 3, on CPU#0:
 #0: ffffffff91cbd2c8 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x323/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff918e46a8 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x28c/0x590 drivers/infiniband/core/device.c:1221
 #2: ffffffff918e4428 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x2ff/0x590 drivers/infiniband/core/device.c:1226
locks held by syz-executor/23852: 3, on CPU#0:
 #0: ffffffff91cbd2c8 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x323/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff918e46a8 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x28c/0x590 drivers/infiniband/core/device.c:1221
 #2: ffffffff918e4428 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x2ff/0x590 drivers/infiniband/core/device.c:1226
locks held by syz-executor/23882: 3, on CPU#0:
 #0: ffffffff91cbd2c8 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x323/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff918e46a8 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x28c/0x590 drivers/infiniband/core/device.c:1221
 #2: ffffffff918e4428 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x2ff/0x590 drivers/infiniband/core/device.c:1226
locks held by syz-executor/23921: 3, on CPU#0:
 #0: ffffffff91cbd2c8 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x323/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff918e46a8 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x28c/0x590 drivers/infiniband/core/device.c:1221
 #2: ffffffff918e4428 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x2ff/0x590 drivers/infiniband/core/device.c:1226
locks held by syz-executor/23938: 1, on CPU#0:
 #0: ffffffff91cd5e00 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:134 [inline]
 #0: ffffffff91cd5e00 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x31c/0x18c0 net/ipv4/devinet.c:978
locks held by kworker/u8:13/23950: 3, last CPU#0:
 #0: ffff88801d094140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1466/0x1b10 kernel/workqueue.c:3371
 #1: ffffc900037afd08 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3372
 #2: ffff88807c343258 (&devlink->lock_key#3){+.+.}-{4:4}, at: nsim_dev_trap_report_work+0x56/0xd20 drivers/net/netdevsim/dev.c:834
locks held by modprobe/23978: 1, last CPU#0:
 #0: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: fast_dput+0x25/0x6f0 fs/dcache.c:938
locks held by modprobe/23979: 1, last CPU#0:
 #0: ffff88802b9bb440 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:562 [inline]
 #0: ffff88802b9bb440 (&mm->mmap_lock){++++}-{4:4}, at: do_mprotect_pkey+0x254/0xdd0 mm/mprotect.c:902
locks held by dhcpcd/23980: 1, last CPU#0:
 #0: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: mntput_no_expire+0x21/0x220 fs/namespace.c:1469
locks held by dhcpcd/23982: 3, last CPU#0:
 #0: ffff88802b9bc080 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:544 [inline]
 #0: ffff88802b9bc080 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x22c/0xa00 mm/mmap.c:1323
 #1: ffff8880774ed070 (&anon_vma->rwsem){++++}-{4:4}, at: anon_vma_lock_write mm/internal.h:295 [inline]
 #1: ffff8880774ed070 (&anon_vma->rwsem){++++}-{4:4}, at: unlink_anon_vmas+0xde/0x8d0 mm/rmap.c:497
 #2: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #2: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #2: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
 #2: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0xbd/0x2090 arch/x86/kernel/unwind_orc.c:495
locks held by modprobe/23984: 1, last CPU#0:
 #0: ffff88802b9b8340 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:562 [inline]
 #0: ffff88802b9b8340 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1f5/0x470 mm/util.c:579
locks held by dhcpcd/23985: 4, last CPU#0:
 #0: ffff888057e9a088 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x11d/0x590 mm/mmap_lock.c:310
 #1: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #1: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #1: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: do_fault_around mm/memory.c:5957 [inline]
 #1: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: do_read_fault mm/memory.c:5991 [inline]
 #1: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: do_fault+0x9a8/0x1830 mm/memory.c:6134
 #2: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #2: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #2: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: filemap_map_pages+0x1d7/0x2060 mm/filemap.c:3921
 #3: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #3: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #3: ffffffff8fdec5e0 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x2f/0x310 mm/pgtable-generic.c:290

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 32 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 nmi_cpu_backtrace.cold+0x12d/0x151 lib/nmi_backtrace.c:123
 nmi_trigger_cpumask_backtrace+0x21f/0x2a0 lib/nmi_backtrace.c:66
 trigger_all_cpu_backtrace include/linux/nmi.h:164 [inline]
 __sys_info lib/sys_info.c:157 [inline]
 sys_info+0x141/0x190 lib/sys_info.c:165
 check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
 watchdog+0xcb1/0x1030 kernel/hung_task.c:561
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Crashes (277):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/18 09:33 upstream 32c52ec87d62 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/10/18 06:56 upstream 32c52ec87d62 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in rdma_dev_exit_net
2026/10/18 02:21 upstream 58161ead29e5 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/10/17 17:35 upstream 58161ead29e5 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/10/17 15:49 upstream 70dd4ee72eb2 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/10/17 08:40 upstream 70dd4ee72eb2 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/10/17 05:36 upstream 70dd4ee72eb2 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/10/16 15:48 upstream 2f2f7eeef8b0 b1757810 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/10/16 08:51 upstream 2f2f7eeef8b0 3f2522c6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in rdma_dev_exit_net
2026/10/16 05:49 upstream 2f2f7eeef8b0 3f2522c6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in rdma_dev_exit_net
2026/10/11 21:55 upstream b88c841d1164 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/10/08 09:46 upstream 7b63ef2d55f2 4f6a9fcf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in rdma_dev_exit_net
2026/10/05 21:15 upstream 67f0943b394d 1995e6c7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in rdma_dev_exit_net
2026/10/05 12:25 upstream a90ee4305c4a 1995e6c7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/10/03 01:29 upstream ce1e0223d8ad 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/09/30 20:05 upstream 551c722f4080 892a21ec .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/09/27 18:42 upstream 104484baf748 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/09/17 01:21 upstream 9b87fdc9af2f 95928915 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/09/12 04:01 upstream 3026c6e4f223 b6a5eeb7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/09/03 16:47 upstream 940de590b839 6a988719 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/09/01 04:30 upstream bf1079577a11 316d9396 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/06/08 19:04 upstream 4549871118cf 656e94c6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in rdma_dev_exit_net
2026/04/23 20:37 upstream 2e6803928193 4c3406dc .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/04/09 15:48 upstream 7f87a5ea75f0 38c8e246 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in rdma_dev_exit_net
2026/02/02 10:22 upstream 18f7fcd5e69a 018ebef2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in rdma_dev_exit_net
2024/11/25 14:19 upstream 9f16d5e6f220 a84878fc .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in rdma_dev_exit_net
2026/10/17 13:17 net 00accbd9d502 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/10/17 01:00 net 191aa41548b2 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/10/16 12:15 net 191aa41548b2 b1757810 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/10/15 02:52 net 513444cc62e2 8fb0ae89 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/10/14 23:39 net 513444cc62e2 8fb0ae89 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/10/12 08:52 net af32da41b032 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/10/04 09:31 net 6dc989ea46b9 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/10/01 14:02 net 3cdeaef1754a 38f7f0d1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/09/27 21:52 net a7bfaba4823e a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/09/26 22:53 net a7bfaba4823e a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/09/26 07:52 net aadf655e8ea9 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/09/25 08:51 net 11536ee3d3e0 f281d9d2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/09/24 06:32 net ab1404ac8115 0a1606bc .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/09/20 06:33 net c82b797abe66 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/09/18 12:58 net 3b95a04eb5f9 8d7d05f1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/09/17 20:23 net c9151088f167 95928915 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/09/06 07:21 net 2b4707a149a5 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/09/06 03:24 net 2b4707a149a5 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/09/01 13:41 net 545b63503c69 316d9396 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/09/01 11:38 net 545b63503c69 316d9396 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/09/01 04:38 net 1376afc7660b 316d9396 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in rdma_dev_exit_net
2024/12/14 18:15 net 429fde2d81bc 7cbfbb3a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in rdma_dev_exit_net
2024/12/10 15:42 net f136552b7ce3 cfc402b4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/10/16 19:12 net-next 6b3e73774815 b1757810 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/10/06 17:40 net-next a5e7d8e446af f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/09/29 20:00 net-next 6e23f90f2b8c 7808aef4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/09/13 02:54 net-next 879e280b8486 70a60e12 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/09/10 07:51 net-next 8342c68435dd 4e8b1cc6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/09/07 23:30 net-next 31f961de2f90 680aa3e1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/09/06 13:56 net-next 31f961de2f90 4f7b22a0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/09/03 02:57 net-next c29b37ed7a4d 85995287 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/08/07 03:31 linux-next 1701fda2f58e c38879ea .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in rdma_dev_exit_net
* Struck through repros no longer work on HEAD.