netlink: 'syz.0.574': attribute type 19 has an invalid length.
FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
======================================================
WARNING: possible circular locking dependency detected
6.1.132-syzkaller #0 Not tainted
------------------------------------------------------
syz.0.574/6914 is trying to acquire lock:
ffffffff8d20a5d8 ((console_sem).lock){-...}-{2:2}, at: down_trylock+0x1c/0xa0 kernel/locking/semaphore.c:139

but task is already holding lock:
ffff8880b8f3a998 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:537

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&rq->__lock){-.-.}-{2:2}:
       lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
       _raw_spin_lock_nested+0x2d/0x40 kernel/locking/spinlock.c:378
       raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:537
       raw_spin_rq_lock kernel/sched/sched.h:1355 [inline]
       rq_lock kernel/sched/sched.h:1645 [inline]
       task_fork_fair+0x5d/0x350 kernel/sched/fair.c:11888
       sched_cgroup_fork+0x374/0x400 kernel/sched/core.c:4685
       copy_process+0x2482/0x40a0 kernel/fork.c:2383
       kernel_clone+0x222/0x920 kernel/fork.c:2681
       user_mode_thread+0x140/0x1b0 kernel/fork.c:2757
       rest_init+0x23/0x300 init/main.c:698
       start_kernel+0x0/0x53f init/main.c:893
       start_kernel+0x496/0x53f init/main.c:1140
       secondary_startup_64_no_verify+0xcf/0xdb

-> #1 (&p->pi_lock){-.-.}-{2:2}:
       lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
       try_to_wake_up+0xad/0x1250 kernel/sched/core.c:4111
       up+0x6e/0x90 kernel/locking/semaphore.c:191
       __up_console_sem+0x11a/0x1e0 kernel/printk/printk.c:260
       __console_unlock kernel/printk/printk.c:2697 [inline]
       console_unlock+0x591/0x7c0 kernel/printk/printk.c:2908
       vprintk_emit+0x523/0x740 kernel/printk/printk.c:2303
       dev_vprintk_emit+0x334/0x3d9 drivers/base/core.c:4933
       dev_printk_emit+0xd9/0x118 drivers/base/core.c:4944
       _dev_warn+0x11e/0x165 drivers/base/core.c:5000
       firmware_fallback_sysfs+0x674/0x940 drivers/base/firmware_loader/fallback.c:229
       _request_firmware+0xcf0/0x12b0 drivers/base/firmware_loader/main.c:884
       request_firmware_work_func+0x126/0x270 drivers/base/firmware_loader/main.c:1135
       process_one_work+0x917/0x1260 kernel/workqueue.c:2292
       worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
       kthread+0x28d/0x320 kernel/kthread.c:376
       ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

-> #0 ((console_sem).lock){-...}-{2:2}:
       check_prev_add kernel/locking/lockdep.c:3090 [inline]
       check_prevs_add kernel/locking/lockdep.c:3209 [inline]
       validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825
       __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049
       lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
       down_trylock+0x1c/0xa0 kernel/locking/semaphore.c:139
       __down_trylock_console_sem+0x105/0x250 kernel/printk/printk.c:243
       console_trylock kernel/printk/printk.c:2650 [inline]
       console_trylock_spinning kernel/printk/printk.c:1896 [inline]
       vprintk_emit+0x1ee/0x740 kernel/printk/printk.c:2302
       _printk+0xd1/0x111 kernel/printk/printk.c:2328
       fail_dump lib/fault-inject.c:45 [inline]
       should_fail_ex+0x387/0x4d0 lib/fault-inject.c:147
       strncpy_from_user+0x32/0x360 lib/strncpy_from_user.c:118
       strncpy_from_user_nofault+0x6c/0x130 mm/maccess.c:186
       bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:204 [inline]
       ____bpf_probe_read_user_str kernel/trace/bpf_trace.c:213 [inline]
       bpf_probe_read_user_str+0x26/0x70 kernel/trace/bpf_trace.c:210
       bpf_prog_02a70dbeb5f742df+0x3a/0x3c
       bpf_dispatcher_nop_func include/linux/bpf.h:1000 [inline]
       __bpf_prog_run include/linux/filter.h:603 [inline]
       bpf_prog_run include/linux/filter.h:610 [inline]
       __bpf_trace_run kernel/trace/bpf_trace.c:2284 [inline]
       bpf_trace_run2+0x1fd/0x410 kernel/trace/bpf_trace.c:2323
       trace_tlb_flush+0x151/0x1a0 include/trace/events/tlb.h:38
       switch_mm_irqs_off+0x84a/0xc20 arch/x86/mm/tlb.c:-1
       context_switch kernel/sched/core.c:5229 [inline]
       __schedule+0x1152/0x4570 kernel/sched/core.c:6561
       preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:6730
       preempt_schedule+0xd9/0xe0 kernel/sched/core.c:6754
       preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
       vprintk_emit+0x683/0x740 kernel/printk/printk.c:2304
       _printk+0xd1/0x111 kernel/printk/printk.c:2328
       validate_nla lib/nlattr.c:395 [inline]
       __nla_validate_parse+0x18f5/0x2c30 lib/nlattr.c:607
       __nla_parse+0x3c/0x50 lib/nlattr.c:704
       __nlmsg_parse include/net/netlink.h:748 [inline]
       nlmsg_parse_deprecated include/net/netlink.h:789 [inline]
       __rtnl_newlink net/core/rtnetlink.c:3484 [inline]
       rtnl_newlink+0x2de/0x2060 net/core/rtnetlink.c:3652
       rtnetlink_rcv_msg+0x822/0x1000 net/core/rtnetlink.c:6150
       netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2493
       netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline]
       netlink_unicast+0x7e2/0x970 net/netlink/af_netlink.c:1337
       netlink_sendmsg+0xa26/0xd60 net/netlink/af_netlink.c:1859
       sock_sendmsg_nosec net/socket.c:718 [inline]
       __sock_sendmsg net/socket.c:730 [inline]
       ____sys_sendmsg+0x5d3/0x9a0 net/socket.c:2519
       ___sys_sendmsg net/socket.c:2573 [inline]
       __sys_sendmsg+0x2a9/0x390 net/socket.c:2602
       do_syscall_x64 arch/x86/entry/common.c:51 [inline]
       do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

other info that might help us debug this:

Chain exists of:
  (console_sem).lock --> &p->pi_lock --> &rq->__lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&rq->__lock);
                               lock(&p->pi_lock);
                               lock(&rq->__lock);
  lock((console_sem).lock);

 *** DEADLOCK ***

3 locks held by syz.0.574/6914:
 #0: ffffffff8e5507a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline]
 #0: ffffffff8e5507a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x7cb/0x1000 net/core/rtnetlink.c:6147
 #1: ffff8880b8f3a998 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:537
 #2: ffffffff8d32e740 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
 #2: ffffffff8d32e740 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
 #2: ffffffff8d32e740 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2283 [inline]
 #2: ffffffff8d32e740 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x110/0x410 kernel/trace/bpf_trace.c:2323

stack backtrace:
CPU: 1 PID: 6914 Comm: syz.0.574 Not tainted 6.1.132-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 check_noncircular+0x2fa/0x3b0 kernel/locking/lockdep.c:2170
 check_prev_add kernel/locking/lockdep.c:3090 [inline]
 check_prevs_add kernel/locking/lockdep.c:3209 [inline]
 validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825
 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049
 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
 down_trylock+0x1c/0xa0 kernel/locking/semaphore.c:139
 __down_trylock_console_sem+0x105/0x250 kernel/printk/printk.c:243
 console_trylock kernel/printk/printk.c:2650 [inline]
 console_trylock_spinning kernel/printk/printk.c:1896 [inline]
 vprintk_emit+0x1ee/0x740 kernel/printk/printk.c:2302
 _printk+0xd1/0x111 kernel/printk/printk.c:2328
 fail_dump lib/fault-inject.c:45 [inline]
 should_fail_ex+0x387/0x4d0 lib/fault-inject.c:147
 strncpy_from_user+0x32/0x360 lib/strncpy_from_user.c:118
 strncpy_from_user_nofault+0x6c/0x130 mm/maccess.c:186
 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:204 [inline]
 ____bpf_probe_read_user_str kernel/trace/bpf_trace.c:213 [inline]
 bpf_probe_read_user_str+0x26/0x70 kernel/trace/bpf_trace.c:210
 bpf_prog_02a70dbeb5f742df+0x3a/0x3c
 bpf_dispatcher_nop_func include/linux/bpf.h:1000 [inline]
 __bpf_prog_run include/linux/filter.h:603 [inline]
 bpf_prog_run include/linux/filter.h:610 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2284 [inline]
 bpf_trace_run2+0x1fd/0x410 kernel/trace/bpf_trace.c:2323
 trace_tlb_flush+0x151/0x1a0 include/trace/events/tlb.h:38
 switch_mm_irqs_off+0x84a/0xc20 arch/x86/mm/tlb.c:-1
 context_switch kernel/sched/core.c:5229 [inline]
 __schedule+0x1152/0x4570 kernel/sched/core.c:6561
 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:6730
 preempt_schedule+0xd9/0xe0 kernel/sched/core.c:6754
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
 vprintk_emit+0x683/0x740 kernel/printk/printk.c:2304
 _printk+0xd1/0x111 kernel/printk/printk.c:2328
 validate_nla lib/nlattr.c:395 [inline]
 __nla_validate_parse+0x18f5/0x2c30 lib/nlattr.c:607
 __nla_parse+0x3c/0x50 lib/nlattr.c:704
 __nlmsg_parse include/net/netlink.h:748 [inline]
 nlmsg_parse_deprecated include/net/netlink.h:789 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3484 [inline]
 rtnl_newlink+0x2de/0x2060 net/core/rtnetlink.c:3652
 rtnetlink_rcv_msg+0x822/0x1000 net/core/rtnetlink.c:6150
 netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2493
 netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline]
 netlink_unicast+0x7e2/0x970 net/netlink/af_netlink.c:1337
 netlink_sendmsg+0xa26/0xd60 net/netlink/af_netlink.c:1859
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 ____sys_sendmsg+0x5d3/0x9a0 net/socket.c:2519
 ___sys_sendmsg net/socket.c:2573 [inline]
 __sys_sendmsg+0x2a9/0x390 net/socket.c:2602
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7ff2b5d8d169
Code: Unable to access opcode bytes at 0x7ff2b5d8d13f.
RSP: 002b:00007ff2b6c16038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007ff2b5fa5fa0 RCX: 00007ff2b5d8d169
RDX: 0000000000000000 RSI: 0000200000000040 RDI: 0000000000000003
RBP: 00007ff2b6c16090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007ff2b5fa5fa0 R15: 00007fff5faa4eb8
 </TASK>
CPU: 1 PID: 6914 Comm: syz.0.574 Not tainted 6.1.132-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 fail_dump lib/fault-inject.c:52 [inline]
 should_fail_ex+0x3a6/0x4d0 lib/fault-inject.c:147
 strncpy_from_user+0x32/0x360 lib/strncpy_from_user.c:118
 strncpy_from_user_nofault+0x6c/0x130 mm/maccess.c:186
 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:204 [inline]
 ____bpf_probe_read_user_str kernel/trace/bpf_trace.c:213 [inline]
 bpf_probe_read_user_str+0x26/0x70 kernel/trace/bpf_trace.c:210
 bpf_prog_02a70dbeb5f742df+0x3a/0x3c
 bpf_dispatcher_nop_func include/linux/bpf.h:1000 [inline]
 __bpf_prog_run include/linux/filter.h:603 [inline]
 bpf_prog_run include/linux/filter.h:610 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2284 [inline]
 bpf_trace_run2+0x1fd/0x410 kernel/trace/bpf_trace.c:2323
 trace_tlb_flush+0x151/0x1a0 include/trace/events/tlb.h:38
 switch_mm_irqs_off+0x84a/0xc20 arch/x86/mm/tlb.c:-1
 context_switch kernel/sched/core.c:5229 [inline]
 __schedule+0x1152/0x4570 kernel/sched/core.c:6561
 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:6730
 preempt_schedule+0xd9/0xe0 kernel/sched/core.c:6754
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
 vprintk_emit+0x683/0x740 kernel/printk/printk.c:2304
 _printk+0xd1/0x111 kernel/printk/printk.c:2328
 validate_nla lib/nlattr.c:395 [inline]
 __nla_validate_parse+0x18f5/0x2c30 lib/nlattr.c:607
 __nla_parse+0x3c/0x50 lib/nlattr.c:704
 __nlmsg_parse include/net/netlink.h:748 [inline]
 nlmsg_parse_deprecated include/net/netlink.h:789 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3484 [inline]
 rtnl_newlink+0x2de/0x2060 net/core/rtnetlink.c:3652
 rtnetlink_rcv_msg+0x822/0x1000 net/core/rtnetlink.c:6150
 netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2493
 netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline]
 netlink_unicast+0x7e2/0x970 net/netlink/af_netlink.c:1337
 netlink_sendmsg+0xa26/0xd60 net/netlink/af_netlink.c:1859
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 ____sys_sendmsg+0x5d3/0x9a0 net/socket.c:2519
 ___sys_sendmsg net/socket.c:2573 [inline]
 __sys_sendmsg+0x2a9/0x390 net/socket.c:2602
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7ff2b5d8d169
Code: Unable to access opcode bytes at 0x7ff2b5d8d13f.
RSP: 002b:00007ff2b6c16038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007ff2b5fa5fa0 RCX: 00007ff2b5d8d169
RDX: 0000000000000000 RSI: 0000200000000040 RDI: 0000000000000003
RBP: 00007ff2b6c16090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007ff2b5fa5fa0 R15: 00007fff5faa4eb8
 </TASK>
netlink: 40 bytes leftover after parsing attributes in process `syz.0.574'.
syz.0.574 (6914) used greatest stack depth: 19288 bytes left