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: 894d, last: 8m
▶ ▼ ✨ 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 2086d 2220d 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 1834d 1869d 0/29 auto-closed as invalid on 2022/01/17 19:05
upstream INFO: task hung in rdma_dev_exit_net rdma 1 1 2380d 2380d 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 1010d 1025d 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 4 6d15h 13d 0/2 upstream: reported on 2026/10/15 02:19
linux-5.15 INFO: task hung in rdma_dev_exit_net 1 1 399d 399d 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 1208d 1371d 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:8801 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:24088 pid:8801  tgid:8801  ppid:1      task_flags:0x400140 flags:0x00080003
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x125e/0x6990 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule+0xdd/0x2c0 kernel/sched/core.c:7474
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7531
 rwsem_down_write_slowpath+0x4c6/0x12f0 kernel/locking/rwsem.c:1215
 __down_write_common kernel/locking/rwsem.c:1347 [inline]
 __down_write kernel/locking/rwsem.c:1356 [inline]
 down_write+0x1bb/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+0x340/0x7a0 net/core/net_namespace.c:582
 create_new_namespaces+0x3ea/0xac0 kernel/nsproxy.c:132
 unshare_nsproxy_namespaces+0xf6/0x210 kernel/nsproxy.c:234
 ksys_uns
 ksys_unshare+0x44f/0x980 kernel/fork.c:3292
 __do_sys_unshare kernel/fork.c:3358 [inline]
 __se_sys_unshare kernel/fork.c:3356 [inline]
 __x64_sys_unshare+0x31/0x40 kernel/fork.c:3356
 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: 0033:0x7f15875a0827
RSP: 002b:00007ffc1495f638 EFLAGS: 00000202 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007f1587825f40 RCX: 00007f15875a0827
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
RBP: 00007f15878267b8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000008
R13: 0000000000000003 R14: 00007ffc1495f878 R15: 0000000000000000
 </TASK>

Showing all locks held in the system:
locks held by kworker/u8:0/12: 3, last CPU#0:
 #0: ffff88813ff6c148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1461/0x1b10 kernel/workqueue.c:3470
 #1: ffffc90000117d08 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3471
 #2: ffff888028e7b258 (&devlink->lock_key#2){+.+.}-{4:4}, at: nsim_dev_trap_report_work+0x56/0xd20 drivers/net/netdevsim/dev.c:834
locks held by pr/ttyS0/31: 2, last CPU#1:
 #0: ffffffff8ffd7718 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:314 [inline]
 #0: ffffffff8ffd7718 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:493 [inline]
 #0: ffffffff8ffd7718 (console_srcu){....}-{0:0}, at: console_srcu_read_lock+0x49/0x60 kernel/printk/printk.c:291
 #1: ffffffff9cf379d8 (&port_lock_key){-.-.}-{3:3}, at: __uart_port_lock_irqsave include/linux/serial_core.h:613 [inline]
 #1: ffffffff9cf379d8 (&port_lock_key){-.-.}-{3:3}, at: univ8250_console_device_lock+0x64/0xc0 drivers/tty/serial/8250/8250_core.c:413
locks held by khungtaskd/32: 1, last CPU#0:
 #0: ffffffff8ffeb4e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffffffff8ffeb4e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8ffeb4e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x3d/0x184 kernel/locking/lockdep.c:6871
locks held by kcompactd0/35: 1, last CPU#0:
 #0: ffff88807d045388 (&anon_vma->rwsem){++++}-{4:4}, at: anon_vma_trylock_read mm/internal.h:320 [inline]
 #0: ffff88807d045388 (&anon_vma->rwsem){++++}-{4:4}, at: rmap_walk_anon_lock mm/rmap.c:2983 [inline]
 #0: ffff88807d045388 (&anon_vma->rwsem){++++}-{4:4}, at: rmap_walk_anon+0x73b/0x9a0 mm/rmap.c:3025
locks held by kworker/u8:3/50: 4, on CPU#1:
 #0: ffff88801d795148 ((wq_completion)ib-unreg-wq){+.+.}-{0:0}, at: process_one_work+0x1461/0x1b10 kernel/workqueue.c:3470
 #1: ffffc90000bb7d08 ((work_completion)(&device->unregistration_work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3471
 #2: ffff88807e554730 (&device->unregistration_lock){+.+.}-{4:4}, at: __ib_unregister_device+0x23b/0x480 drivers/infiniband/core/device.c:1567
 #3: ffffffff91b3c548 (devices_rwsem){++++}-{4:4}, at: disable_device+0xbf/0x280 drivers/infiniband/core/device.c:1310
locks held by kworker/u8:5/167: 3, last CPU#0:
 #0: ffff88813ff6c148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1461/0x1b10 kernel/workqueue.c:3470
 #1: ffffc90002f57d08 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3471
 #2: ffff88807ec0c258 (&devlink->lock_key#5){+.+.}-{4:4}, at: nsim_dev_trap_report_work+0x56/0xd20 drivers/net/netdevsim/dev.c:834
locks held by kworker/u8:13/4188: 2, on CPU#1:
 #0: ffff88813ff6c148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1461/0x1b10 kernel/workqueue.c:3470
 #1: ffffc90010407d08 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3471
locks held by kworker/u8:14/4231: 4, on CPU#1:
 #0: ffff88801dec8948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x1461/0x1b10 kernel/workqueue.c:3470
 #1: ffffc900104d7d08 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3471
 #2: ffffffff91f0d368 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xb8/0x920 net/core/net_namespace.c:677
 #3: ffffffff8fff78b8 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0xec/0x790 kernel/rcu/tree.c:4002
locks held by kworker/u8:15/4236: 3, on CPU#1:
 #0: ffff88801d792148 ((wq_completion)gid-cache-wq){+.+.}-{0:0}, at: process_one_work+0x1461/0x1b10 kernel/workqueue.c:3470
 #1: ffffc9000db57d08 ((work_completion)(&ndev_work->work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3471
 #2: ffffffff91b3c548 (devices_rwsem){++++}-{4:4}, at: ib_enum_all_roce_netdevs+0x89/0x150 drivers/infiniband/core/device.c:2599
locks held by syslogd/4978: 1, last CPU#0:
 #0: ffff88807e999f78 (&u->iolock){+.+.}-{4:4}, at: __unix_dgram_recvmsg+0x298/0xd40 net/unix/af_unix.c:2591
locks held by klogd/4985: 1, last CPU#0:
 #0: ffffffff8ffeb4e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffffffff8ffeb4e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8ffeb4e0 (rcu_read_lock){....}-{1:3}, at: is_bpf_text_address+0x25/0x1a0 kernel/bpf/core.c:754
locks held by getty/5382: 2, on CPU#0:
 #0: ffff88802b8a00a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000322e2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x419/0x1540 drivers/tty/n_tty.c:2211
locks held by syz-executor/8679: 2, on CPU#0:
 #0: ffffffff91f0d368 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31e/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91b3c548 (devices_rwsem){++++}-{4:4}, at: rdma_dev_exit_net+0x261/0x6b0 drivers/infiniband/core/device.c:1190
locks held by syz-executor/8685: 2, on CPU#0:
 #0: ffffffff91f0d368 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31e/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91b3c548 (devices_rwsem){++++}-{4:4}, at: rdma_dev_exit_net+0x1f2/0x6b0 drivers/infiniband/core/device.c:1164
locks held by syz-executor/8691: 2, on CPU#0:
 #0: ffffffff91f0d368 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31e/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91b3c548 (devices_rwsem){++++}-{4:4}, at: rdma_dev_exit_net+0x1f2/0x6b0 drivers/infiniband/core/device.c:1164
locks held by syz-executor/8718: 2, on CPU#1:
 #0: ffffffff91f0d368 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31e/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91b3c548 (devices_rwsem){++++}-{4:4}, at: rdma_dev_exit_net+0x1f2/0x6b0 drivers/infiniband/core/device.c:1164
locks held by syz-executor/8760: 2, on CPU#0:
 #0: ffffffff91f0d368 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31e/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91b3c2c8 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_exit_net+0x174/0x6b0 drivers/infiniband/core/device.c:1156
locks held by syz-executor/8764: 2, on CPU#1:
 #0: ffffffff91f0d368 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31e/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91b3c2c8 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_exit_net+0x174/0x6b0 drivers/infiniband/core/device.c:1156
locks held by syz-executor/8768: 2, on CPU#0:
 #0: ffffffff91f0d368 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31e/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91b3c2c8 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_exit_net+0x174/0x6b0 drivers/infiniband/core/device.c:1156
locks held by syz-executor/8801: 2, on CPU#0:
 #0: ffffffff91f0d368 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31e/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91b3c2c8 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_exit_net+0x174/0x6b0 drivers/infiniband/core/device.c:1156
locks held by syz-executor/8863: 2, on CPU#1:
 #0: ffffffff91f0d368 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31e/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91b3c2c8 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_exit_net+0x174/0x6b0 drivers/infiniband/core/device.c:1156
locks held by syz-executor/8866: 2, on CPU#1:
 #0: ffffffff91f0d368 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31e/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91b3c2c8 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_exit_net+0x174/0x6b0 drivers/infiniband/core/device.c:1156
locks held by syz-executor/8874: 2, on CPU#1:
 #0: ffffffff91f0d368 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31e/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91b3c2c8 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_exit_net+0x174/0x6b0 drivers/infiniband/core/device.c:1156
locks held by syz-executor/8915: 3, on CPU#0:
 #0: ffffffff91f0d368 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31e/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91b3c548 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x287/0x580 drivers/infiniband/core/device.c:1221
 #2: ffffffff91b3c2c8 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x2fa/0x580 drivers/infiniband/core/device.c:1226
locks held by syz-executor/8946: 3, on CPU#0:
 #0: ffffffff91f0d368 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31e/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91b3c548 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x287/0x580 drivers/infiniband/core/device.c:1221
 #2: ffffffff91b3c2c8 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x2fa/0x580 drivers/infiniband/core/device.c:1226
locks held by syz-executor/8954: 4, last CPU#0:
 #0: ffffffff91f0d368 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31e/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91b3c548 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x287/0x580 drivers/infiniband/core/device.c:1221
 #2: ffffffff91b3c2c8 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x2fa/0x580 drivers/infiniband/core/device.c:1226
 #3: ffff8880369c5020 (&device->compat_devs_mutex){+.+.}-{4:4}, at: add_one_compat_dev+0x112/0x820 drivers/infiniband/core/device.c:976
locks held by syz-executor/8957: 4, on CPU#0:
 #0: ffffffff91f0d368 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31e/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91b3c548 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x287/0x580 drivers/infiniband/core/device.c:1221
 #2: ffffffff91b3c2c8 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x2fa/0x580 drivers/infiniband/core/device.c:1226
 #3: ffff8880369c5020 (&device->compat_devs_mutex){+.+.}-{4:4}, at: add_one_compat_dev+0x112/0x820 drivers/infiniband/core/device.c:976
locks held by syz-executor/8960: 4, on CPU#1:
 #0: ffffffff91f0d368 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31e/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91b3c548 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x287/0x580 drivers/infiniband/core/device.c:1221
 #2: ffffffff91b3c2c8 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x2fa/0x580 drivers/infiniband/core/device.c:1226
 #3: ffff8880369c5020 (&device->compat_devs_mutex){+.+.}-{4:4}, at: add_one_compat_dev+0x112/0x820 drivers/infiniband/core/device.c:976
locks held by syz-executor/9001: 4, on CPU#1:
 #0: ffffffff91f0d368 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31e/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91b3c548 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x287/0x580 drivers/infiniband/core/device.c:1221
 #2: ffffffff91b3c2c8 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x2fa/0x580 drivers/infiniband/core/device.c:1226
 #3: ffff8880369c5020 (&device->compat_devs_mutex){+.+.}-{4:4}, at: add_one_compat_dev+0x112/0x820 drivers/infiniband/core/device.c:976
locks held by syz-executor/9046: 2, on CPU#1:
 #0: ffffffff91f0d368 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31e/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91b3c548 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x287/0x580 drivers/infiniband/core/device.c:1221
locks held by syz-executor/9057: 2, on CPU#1:
 #0: ffffffff91f0d368 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31e/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91b3c548 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x287/0x580 drivers/infiniband/core/device.c:1221
locks held by syz-executor/9059: 2, on CPU#0:
 #0: ffffffff91f0d368 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31e/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91b3c548 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x287/0x580 drivers/infiniband/core/device.c:1221
locks held by syz-executor/9066: 2, on CPU#0:
 #0: ffffffff91f0d368 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31e/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91b3c548 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x287/0x580 drivers/infiniband/core/device.c:1221
locks held by syz-executor/9106: 2, on CPU#0:
 #0: ffffffff91f0d368 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31e/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91b3c548 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x287/0x580 drivers/infiniband/core/device.c:1221
locks held by syz-executor/9156: 2, on CPU#1:
 #0: ffffffff91f0d368 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31e/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91b3c548 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x287/0x580 drivers/infiniband/core/device.c:1221
locks held by syz-executor/9170: 2, on CPU#1:
 #0: ffffffff91f0d368 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31e/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91b3c548 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x287/0x580 drivers/infiniband/core/device.c:1221
locks held by syz-executor/9177: 2, on CPU#0:
 #0: ffffffff91f0d368 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31e/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91b3c548 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x287/0x580 drivers/infiniband/core/device.c:1221
locks held by syz-executor/9186: 2, on CPU#1:
 #0: ffffffff91f0d368 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31e/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91b3c548 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x287/0x580 drivers/infiniband/core/device.c:1221
locks held by modprobe/9239: 1, last CPU#0:
 #0: ffff8880299c1bc0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:550 [inline]
 #0: ffff8880299c1bc0 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1f0/0x490 mm/util.c:579
locks held by sed/9240: 1, last CPU#0:
 #0: ffff88807ddd6540 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:532 [inline]
 #0: ffff88807ddd6540 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x22c/0xa40 mm/mmap.c:1323

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 32 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026
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:377 [inline]
 watchdog+0xd0f/0x10c0 kernel/hung_task.c:598
 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>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: pr/ttyS0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026
RIP: 0010:preempt_count_sub+0x4b/0x150 kernel/sched/core.c:6093
Code: 03 83 c0 03 0f b6 14 11 38 d0 7c 08 84 d2 0f 85 d6 00 00 00 8b 0d 85 13 ee 1a 85 c9 75 14 65 48 8b 05 21 9a e0 13 39 d8 72 1b <81> fb fe 00 00 00 76 6f f7 db 48 63 db 65 48 01 1d 08 9a e0 13 5b
RSP: 0018:ffffc90000a77938 EFLAGS: 00000002
RAX: 8000000000000002 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000000004 RSI: ffffffff8c833500 RDI: 0000000000000001
RBP: 0000016d6fc3cd86 R08: 0000000000000000 R09: 00000000000007b6
R10: 0000000000000003 R11: 205d323354202020 R12: 0000000000000001
R13: 0000000000000af1 R14: fffffbfff39e6f95 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888122590000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f027803940e CR3: 000000004935c000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 delay_tsc+0x6a/0xc0 arch/x86/lib/delay.c:75
 udelay include/asm-generic/delay.h:62 [inline]
 wait_for_lsr+0xf3/0x210 drivers/tty/serial/8250/8250_port.c:2042
 serial8250_fifo_wait_for_lsr_thre+0x5f/0xd0 drivers/tty/serial/8250/8250_port.c:3294
 __serial8250_console_fifo_write+0xa5/0x290 drivers/tty/serial/8250/8250_port.c:3369
 serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3402 [inline]
 __serial8250_console_write drivers/tty/serial/8250/8250_port.c:3456 [inline]
 serial8250_console_write+0x1108/0x14f0 drivers/tty/serial/8250/8250_port.c:3520
 nbcon_emit_next_record+0x8f7/0xa70 kernel/printk/nbcon.c:1070
 nbcon_emit_one+0x1a8/0x2b0 kernel/printk/nbcon.c:1157
 nbcon_kthread_func+0x5ef/0x7f0 kernel/printk/nbcon.c:1271
 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 (329):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/28 12:38 upstream 65ba8f34ec88 858db2ec .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/10/26 02:01 upstream 21a7f44fd076 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/10/25 20:30 upstream 21a7f44fd076 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/10/25 20:27 upstream 21a7f44fd076 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/10/25 13:22 upstream 21a7f44fd076 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/10/24 21:23 upstream 5b0764a53235 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/10/24 12:45 upstream 4da9dedf3fc5 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/10/23 21:54 upstream 734bef548a96 d566bfda .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/10/23 18:09 upstream 734bef548a96 d566bfda .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/10/23 00:09 upstream 2a08195e4db5 4ba27f85 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/10/22 15:24 upstream 9ba46df34488 4ba27f85 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/10/22 13:08 upstream 9ba46df34488 4ba27f85 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/10/22 01:07 upstream 9ba46df34488 61c200c7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/10/21 08:05 upstream 9e947d96915a 61c200c7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/10/21 05:15 upstream 9e947d96915a df8746fb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/10/20 12:49 upstream f47d223627f8 df8746fb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/10/20 11:13 upstream f47d223627f8 72cdc28d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/10/19 18:13 upstream c03c1a14507d 72cdc28d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in rdma_dev_exit_net
2026/10/19 16:18 upstream c03c1a14507d 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
2026/10/19 03:30 upstream f909e534f5e3 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
2026/10/19 00:26 upstream f909e534f5e3 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
2026/10/19 00:20 upstream f909e534f5e3 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 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
2026/06/08 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
2026/10/26 12:45 net 6430fb7f1cc4 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/10/26 07:52 net 7076f684d513 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/10/26 04:15 net 7076f684d513 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/10/24 22:47 net 7076f684d513 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/10/24 17:00 net 7076f684d513 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/10/22 04:47 net abeacca61eea 61c200c7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/10/20 00:47 net 78731b46967e 72cdc28d .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 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
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
2026/10/23 23:53 net-next 734bef548a96 d566bfda .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/10/20 03:40 net-next ecb8b18051a1 72cdc28d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/10/19 22:55 net-next ecb8b18051a1 72cdc28d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/10/19 05:26 net-next 98c2ad4f5d80 432c0077 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in rdma_dev_exit_net
2026/10/16 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
2026/10/24 11:34 linux-next 20a33c6b6cbe 1d9ca40b .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
2026/10/19 21:00 linux-next 3d229ce89862 72cdc28d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce INFO: task hung in rdma_dev_exit_net
* Struck through repros no longer work on HEAD.