INFO: task syz.1.1418:11246 blocked for more than 143 seconds.
      Not tainted 6.15.0-rc2-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.1418      state:D stack:25688 pid:11246 tgid:11234 ppid:5818   task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x116f/0x5de0 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6860
 schedule_timeout+0x257/0x290 kernel/time/sleep_timeout.c:75
 do_wait_for_common kernel/sched/completion.c:95 [inline]
 __wait_for_common+0x2fc/0x4e0 kernel/sched/completion.c:116
 disable_device+0x16f/0x280 drivers/infiniband/core/device.c:1288
 __ib_unregister_device+0x2b4/0x480 drivers/infiniband/core/device.c:1516
 ib_unregister_device_and_put+0x5a/0x80 drivers/infiniband/core/device.c:1581
 nldev_dellink+0x21f/0x320 drivers/infiniband/core/nldev.c:1826
 rdma_nl_rcv_msg+0x387/0x6e0 drivers/infiniband/core/netlink.c:195
 rdma_nl_rcv_skb.constprop.0.isra.0+0x2e5/0x450 drivers/infiniband/core/netlink.c:239
 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
 netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339
 netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883
 sock_sendmsg_nosec net/socket.c:712 [inline]
 __sock_sendmsg net/socket.c:727 [inline]
 ____sys_sendmsg+0xa95/0xc70 net/socket.c:2566
 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2620
 __sys_sendmsg+0x16d/0x220 net/socket.c:2652
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7faaf9f8d169
RSP: 002b:00007faaf7991038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007faafa1a6240 RCX: 00007faaf9f8d169
RDX: 0000000000000000 RSI: 00002000000002c0 RDI: 0000000000000007
RBP: 00007faafa00e990 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007faafa1a6240 R15: 00007ffc29f22a08
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc2-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:274 [inline]
 watchdog+0xf70/0x12c0 kernel/hung_task.c:437
 kthread+0x3c2/0x780 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.15.0-rc2-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210
Code: 96 56 55 00 48 89 df 5b e9 3d b0 5a 00 be 03 00 00 00 5b e9 c2 60 14 03 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 8b 34 24 65 48 8b 15 98 a2 eb 11 65 8b 05 a9 a2 eb
RSP: 0018:ffffffff8e007650 EFLAGS: 00000002
RAX: 0000000000000000 RBX: ffffffff8829ba25 RCX: ffffffff8b66ea4b
RDX: ffffffff8e097740 RSI: ffffffff850108a5 RDI: 0000000000000006
RBP: ffffffff850108a5 R08: 0000000000000006 R09: ffffffff850108a5
R10: ffffffff8829ba25 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000114 R14: 000000000000000c R15: ffffffff8dec0c50
FS:  0000000000000000(0000) GS:ffff8881249b2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000035c7c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 cmp_ex_search+0x75/0xb0 lib/extable.c:99
 __inline_bsearch include/linux/bsearch.h:15 [inline]
 bsearch+0x5b/0xc0 lib/bsearch.c:33
 search_extable+0x82/0xb0 lib/extable.c:116
 search_kernel_exception_table kernel/extable.c:49 [inline]
 search_exception_tables+0x37/0x60 kernel/extable.c:58
 fixup_exception+0x51/0xaf0 arch/x86/mm/extable.c:320
 kernelmode_fixup_or_oops.constprop.0+0x6c/0xe0 arch/x86/mm/fault.c:727
 __bad_area_nosemaphore+0x399/0x6a0 arch/x86/mm/fault.c:784
 do_user_addr_fault+0x927/0x1370 arch/x86/mm/fault.c:1272
 handle_page_fault arch/x86/mm/fault.c:1480 [inline]
 exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1538
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:do_strncpy_from_user lib/strncpy_from_user.c:72 [inline]
RIP: 0010:strncpy_from_user+0x1d5/0x2e0 lib/strncpy_from_user.c:130
Code: 0f 84 9b 00 00 00 e8 ea 34 ba fc 48 83 c3 01 48 83 ed 01 31 ff 48 89 ee e8 48 30 ba fc 48 85 ed 74 65 e8 ce 34 ba fc 45 31 ff <41> 8a 04 1c 31 ff 44 89 fe 41 89 c6 e8 fa 2f ba fc 45 85 ff 0f 84
RSP: 0018:ffffffff8e007978 EFLAGS: 00050046
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff85010898
RDX: ffffffff8e097740 RSI: ffffffff850108a2 RDI: 0000000000000007
RBP: 0000000000000008 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff8e007a18 R14: 0000000000000000 R15: 0000000000000000
 strncpy_from_user_nofault+0x7f/0x180 mm/maccess.c:193
 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:215 [inline]
 ____bpf_probe_read_compat_str kernel/trace/bpf_trace.c:310 [inline]
 bpf_probe_read_compat_str+0xf1/0x170 kernel/trace/bpf_trace.c:306
 bpf_prog_c1796171ffc7efef+0x3e/0x40
 bpf_dispatcher_nop_func include/linux/bpf.h:1316 [inline]
 __bpf_prog_run include/linux/filter.h:718 [inline]
 bpf_prog_run include/linux/filter.h:725 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2363 [inline]
 bpf_trace_run4+0x249/0x5a0 kernel/trace/bpf_trace.c:2406
 __bpf_trace_sched_switch+0x145/0x190 include/trace/events/sched.h:220
 __traceiter_sched_switch+0x6c/0xc0 include/trace/events/sched.h:220
 __do_trace_sched_switch include/trace/events/sched.h:220 [inline]
 trace_sched_switch include/trace/events/sched.h:220 [inline]
 __schedule+0x1bf3/0x5de0 kernel/sched/core.c:6764
 schedule_idle+0x5c/0x90 kernel/sched/core.c:6886
 do_idle+0x2b6/0x510 kernel/sched/idle.c:353
 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:423
 rest_init+0x16b/0x2b0 init/main.c:743
 start_kernel+0x3e9/0x4d0 init/main.c:1099
 x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:513
 x86_64_start_kernel+0xb0/0xc0 arch/x86/kernel/head64.c:494
 common_startup_64+0x13e/0x148
 </TASK>