FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
======================================================
WARNING: possible circular locking dependency detected
6.1.130-syzkaller #0 Not tainted
------------------------------------------------------
syz.0.25/4405 is trying to acquire lock:
ffffffff8d20a538 ((console_sem).lock){-...}-{2:2}, at: down_trylock+0x1c/0xa0 kernel/locking/semaphore.c:139

but task is already holding lock:
ffff8880b8f3a9d8 (&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:11886
       sched_cgroup_fork+0x374/0x400 kernel/sched/core.c:4684
       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:4110
       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:4932
       dev_printk_emit+0xd9/0x118 drivers/base/core.c:4943
       _dev_warn+0x11e/0x165 drivers/base/core.c:4999
       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_compat_str kernel/trace/bpf_trace.c:310 [inline]
       bpf_probe_read_compat_str+0xe4/0x180 kernel/trace/bpf_trace.c:306
       bpf_prog_c1796171ffc7efef+0x35/0x37
       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_run4+0x253/0x470 kernel/trace/bpf_trace.c:2325
       __traceiter_sched_switch+0x91/0xc0 include/trace/events/sched.h:222
       trace_sched_switch include/trace/events/sched.h:222 [inline]
       __schedule+0x2128/0x4570 kernel/sched/core.c:6557
       preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6872
       irqentry_exit+0x53/0x80 kernel/entry/common.c:439
       asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:696
       inet_diag_dump_icsk+0x773/0x1530
       __inet_diag_dump+0x20e/0x3a0 net/ipv4/inet_diag.c:1179
       inet_diag_dump_compat+0x1bd/0x2d0 net/ipv4/inet_diag.c:1288
       netlink_dump+0x581/0xc80 net/netlink/af_netlink.c:2218
       __netlink_dump_start+0x529/0x6d0 net/netlink/af_netlink.c:2320
       netlink_dump_start include/linux/netlink.h:269 [inline]
       inet_diag_rcv_msg_compat+0x207/0x4e0 net/ipv4/inet_diag.c:1323
       sock_diag_rcv_msg+0x3be/0x5b0
       netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2493
       sock_diag_rcv+0x26/0x40 net/core/sock_diag.c:295
       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 ***

5 locks held by syz.0.25/4405:
 #0: ffffffff8e55b0a8 (sock_diag_mutex){+.+.}-{3:3}, at: sock_diag_rcv+0x17/0x40 net/core/sock_diag.c:294
 #1: ffff8880599f7690 (nlk_cb_mutex-SOCK_DIAG){+.+.}-{3:3}, at: __netlink_dump_start+0x136/0x6d0 net/netlink/af_netlink.c:2287
 #2: ffffffff8e640188 (inet_diag_table_mutex){+.+.}-{3:3}, at: inet_diag_lock_handler net/ipv4/inet_diag.c:63 [inline]
 #2: ffffffff8e640188 (inet_diag_table_mutex){+.+.}-{3:3}, at: __inet_diag_dump+0x191/0x3a0 net/ipv4/inet_diag.c:1177
 #3: ffff8880b8f3a9d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:537
 #4: ffffffff8d32e680 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
 #4: ffffffff8d32e680 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
 #4: ffffffff8d32e680 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2283 [inline]
 #4: ffffffff8d32e680 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run4+0x16a/0x470 kernel/trace/bpf_trace.c:2325

stack backtrace:
CPU: 1 PID: 4405 Comm: syz.0.25 Not tainted 6.1.130-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_compat_str kernel/trace/bpf_trace.c:310 [inline]
 bpf_probe_read_compat_str+0xe4/0x180 kernel/trace/bpf_trace.c:306
 bpf_prog_c1796171ffc7efef+0x35/0x37
 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_run4+0x253/0x470 kernel/trace/bpf_trace.c:2325
 __traceiter_sched_switch+0x91/0xc0 include/trace/events/sched.h:222
 trace_sched_switch include/trace/events/sched.h:222 [inline]
 __schedule+0x2128/0x4570 kernel/sched/core.c:6557
 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6872
 irqentry_exit+0x53/0x80 kernel/entry/common.c:439
 asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:696
RIP: 0010:inet_diag_dump_icsk+0x773/0x1530
Code: 8c 24 e0 00 00 00 48 89 d1 48 89 94 24 80 00 00 00 48 c1 ea 03 48 89 94 24 d8 00 00 00 44 89 74 24 20 8b 4c 24 10 89 4c 24 1c <48> 8b 8c 24 e8 00 00 00 42 80 3c 29 00 74 0f 48 8b 7c 24 50 e8 d4
RSP: 0018:ffffc90004667000 EFLAGS: 00000293
RAX: ffffffff977fe020 RBX: 0000000000000001 RCX: ffff88802b919dc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900046672a0 R08: ffffffff8956a8fe R09: ffffc900046671d0
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8880599f75f0
R13: dffffc0000000000 R14: 0000000000000002 R15: ffff88802cf90000
 __inet_diag_dump+0x20e/0x3a0 net/ipv4/inet_diag.c:1179
 inet_diag_dump_compat+0x1bd/0x2d0 net/ipv4/inet_diag.c:1288
 netlink_dump+0x581/0xc80 net/netlink/af_netlink.c:2218
 __netlink_dump_start+0x529/0x6d0 net/netlink/af_netlink.c:2320
 netlink_dump_start include/linux/netlink.h:269 [inline]
 inet_diag_rcv_msg_compat+0x207/0x4e0 net/ipv4/inet_diag.c:1323
 sock_diag_rcv_msg+0x3be/0x5b0
 netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2493
 sock_diag_rcv+0x26/0x40 net/core/sock_diag.c:295
 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: 0033:0x7fbbbb18d169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbbbc084038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fbbbb3a5fa0 RCX: 00007fbbbb18d169
RDX: 0000000000000000 RSI: 0000400000000180 RDI: 0000000000000003
RBP: 00007fbbbc084090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 0000000000000000 R14: 00007fbbbb3a5fa0 R15: 00007ffe2e504ce8
 </TASK>
CPU: 1 PID: 4405 Comm: syz.0.25 Not tainted 6.1.130-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_compat_str kernel/trace/bpf_trace.c:310 [inline]
 bpf_probe_read_compat_str+0xe4/0x180 kernel/trace/bpf_trace.c:306
 bpf_prog_c1796171ffc7efef+0x35/0x37
 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_run4+0x253/0x470 kernel/trace/bpf_trace.c:2325
 __traceiter_sched_switch+0x91/0xc0 include/trace/events/sched.h:222
 trace_sched_switch include/trace/events/sched.h:222 [inline]
 __schedule+0x2128/0x4570 kernel/sched/core.c:6557
 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6872
 irqentry_exit+0x53/0x80 kernel/entry/common.c:439
 asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:696
RIP: 0010:inet_diag_dump_icsk+0x773/0x1530
Code: 8c 24 e0 00 00 00 48 89 d1 48 89 94 24 80 00 00 00 48 c1 ea 03 48 89 94 24 d8 00 00 00 44 89 74 24 20 8b 4c 24 10 89 4c 24 1c <48> 8b 8c 24 e8 00 00 00 42 80 3c 29 00 74 0f 48 8b 7c 24 50 e8 d4
RSP: 0018:ffffc90004667000 EFLAGS: 00000293
RAX: ffffffff977fe020 RBX: 0000000000000001 RCX: ffff88802b919dc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900046672a0 R08: ffffffff8956a8fe R09: ffffc900046671d0
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8880599f75f0
R13: dffffc0000000000 R14: 0000000000000002 R15: ffff88802cf90000
 __inet_diag_dump+0x20e/0x3a0 net/ipv4/inet_diag.c:1179
 inet_diag_dump_compat+0x1bd/0x2d0 net/ipv4/inet_diag.c:1288
 netlink_dump+0x581/0xc80 net/netlink/af_netlink.c:2218
 __netlink_dump_start+0x529/0x6d0 net/netlink/af_netlink.c:2320
 netlink_dump_start include/linux/netlink.h:269 [inline]
 inet_diag_rcv_msg_compat+0x207/0x4e0 net/ipv4/inet_diag.c:1323
 sock_diag_rcv_msg+0x3be/0x5b0
 netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2493
 sock_diag_rcv+0x26/0x40 net/core/sock_diag.c:295
 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: 0033:0x7fbbbb18d169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbbbc084038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fbbbb3a5fa0 RCX: 00007fbbbb18d169
RDX: 0000000000000000 RSI: 0000400000000180 RDI: 0000000000000003
RBP: 00007fbbbc084090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 0000000000000000 R14: 00007fbbbb3a5fa0 R15: 00007ffe2e504ce8
 </TASK>
syz.0.25 (4405) used greatest stack depth: 20120 bytes left
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	e0 00                	loopne 0x2
   2:	00 00                	add    %al,(%rax)
   4:	48 89 d1             	mov    %rdx,%rcx
   7:	48 89 94 24 80 00 00 	mov    %rdx,0x80(%rsp)
   e:	00
   f:	48 c1 ea 03          	shr    $0x3,%rdx
  13:	48 89 94 24 d8 00 00 	mov    %rdx,0xd8(%rsp)
  1a:	00
  1b:	44 89 74 24 20       	mov    %r14d,0x20(%rsp)
  20:	8b 4c 24 10          	mov    0x10(%rsp),%ecx
  24:	89 4c 24 1c          	mov    %ecx,0x1c(%rsp)
* 28:	48 8b 8c 24 e8 00 00 	mov    0xe8(%rsp),%rcx <-- trapping instruction
  2f:	00
  30:	42 80 3c 29 00       	cmpb   $0x0,(%rcx,%r13,1)
  35:	74 0f                	je     0x46
  37:	48 8b 7c 24 50       	mov    0x50(%rsp),%rdi
  3c:	e8                   	.byte 0xe8
  3d:	d4                   	(bad)