FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 0
======================================================
WARNING: possible circular locking dependency detected
6.13.0-rc5-syzkaller-00004-gccb98ccef0e5 #0 Not tainted
------------------------------------------------------
syz.5.4772/26508 is trying to acquire lock:
ffffffff8e813538 ((console_sem).lock){-.-.}-{2:2}, at: down_trylock+0x20/0xa0 kernel/locking/semaphore.c:139

but task is already holding lock:
ffff8880b872a718 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x112/0x240 kernel/time/timer.c:1050

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #3 (&base->lock){-.-.}-{2:2}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
       lock_timer_base+0x112/0x240 kernel/time/timer.c:1050
       __mod_timer+0x1ca/0xeb0 kernel/time/timer.c:1131
       queue_delayed_work_on+0x1ca/0x390 kernel/workqueue.c:2552
       psi_task_change+0xed/0x270 kernel/sched/psi.c:912
       psi_enqueue kernel/sched/stats.h:162 [inline]
       enqueue_task+0x2b4/0x330 kernel/sched/core.c:2068
       activate_task kernel/sched/core.c:2108 [inline]
       wake_up_new_task+0x576/0xc70 kernel/sched/core.c:4870
       kernel_clone+0x4ee/0x8e0 kernel/fork.c:2837
       user_mode_thread+0x132/0x1a0 kernel/fork.c:2884
       rest_init+0x23/0x300 init/main.c:712
       start_kernel+0x47f/0x500 init/main.c:1102
       x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:507
       x86_64_start_kernel+0x9f/0xa0 arch/x86/kernel/head64.c:488
       common_startup_64+0x13e/0x147

-> #2 (&rq->__lock){-.-.}-{2:2}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
       _raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378
       raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:598
       raw_spin_rq_lock kernel/sched/sched.h:1523 [inline]
       task_rq_lock+0xc6/0x360 kernel/sched/core.c:700
       cgroup_move_task+0x9b/0x5a0 kernel/sched/psi.c:1161
       css_set_move_task+0x72e/0x950 kernel/cgroup/cgroup.c:898
       cgroup_post_fork+0x256/0x880 kernel/cgroup/cgroup.c:6691
       copy_process+0x39e9/0x3d50 kernel/fork.c:2620
       kernel_clone+0x226/0x8e0 kernel/fork.c:2806
       user_mode_thread+0x132/0x1a0 kernel/fork.c:2884
       rest_init+0x23/0x300 init/main.c:712
       start_kernel+0x47f/0x500 init/main.c:1102
       x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:507
       x86_64_start_kernel+0x9f/0xa0 arch/x86/kernel/head64.c:488
       common_startup_64+0x13e/0x147

-> #1 (&p->pi_lock){-.-.}-{2:2}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
       class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:551 [inline]
       try_to_wake_up+0xc2/0x1470 kernel/sched/core.c:4205
       up+0x72/0x90 kernel/locking/semaphore.c:191
       __up_console_sem kernel/printk/printk.c:343 [inline]
       __console_unlock+0x123/0x1f0 kernel/printk/printk.c:2869
       __console_flush_and_unlock kernel/printk/printk.c:3271 [inline]
       console_unlock+0x18f/0x3b0 kernel/printk/printk.c:3309
       vprintk_emit+0x730/0xa10 kernel/printk/printk.c:2432
       _printk+0xd5/0x120 kernel/printk/printk.c:2457
       batadv_check_known_mac_addr+0x2b1/0x410 net/batman-adv/hard-interface.c:526
       batadv_hard_if_event+0x3a5/0x1810 net/batman-adv/hard-interface.c:998
       notifier_call_chain+0x1a7/0x3f0 kernel/notifier.c:85
       call_netdevice_notifiers_extack net/core/dev.c:2034 [inline]
       call_netdevice_notifiers net/core/dev.c:2048 [inline]
       dev_set_mac_address+0x3d9/0x510 net/core/dev.c:9212
       dev_set_mac_address_user+0x31/0x50 net/core/dev.c:9226
       do_setlink+0x74b/0x4210 net/core/rtnetlink.c:3064
       rtnl_changelink net/core/rtnetlink.c:3723 [inline]
       __rtnl_newlink net/core/rtnetlink.c:3875 [inline]
       rtnl_newlink+0x1bb6/0x2210 net/core/rtnetlink.c:4012
       rtnetlink_rcv_msg+0x793/0xcf0 net/core/rtnetlink.c:6922
       netlink_rcv_skb+0x1e5/0x430 net/netlink/af_netlink.c:2542
       netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline]
       netlink_unicast+0x7f8/0x990 net/netlink/af_netlink.c:1347
       netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1891
       sock_sendmsg_nosec net/socket.c:711 [inline]
       __sock_sendmsg+0x223/0x270 net/socket.c:726
       __sys_sendto+0x363/0x4c0 net/socket.c:2197
       __do_sys_sendto net/socket.c:2204 [inline]
       __se_sys_sendto net/socket.c:2200 [inline]
       __x64_sys_sendto+0xde/0x100 net/socket.c:2200
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 ((console_sem).lock){-.-.}-{2:2}:
       check_prev_add kernel/locking/lockdep.c:3161 [inline]
       check_prevs_add kernel/locking/lockdep.c:3280 [inline]
       validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
       __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
       down_trylock+0x20/0xa0 kernel/locking/semaphore.c:139
       __down_trylock_console_sem+0x109/0x250 kernel/printk/printk.c:326
       console_trylock kernel/printk/printk.c:2852 [inline]
       console_trylock_spinning kernel/printk/printk.c:2009 [inline]
       vprintk_emit+0x3d7/0xa10 kernel/printk/printk.c:2431
       _printk+0xd5/0x120 kernel/printk/printk.c:2457
       fail_dump lib/fault-inject.c:46 [inline]
       should_fail_ex+0x391/0x4e0 lib/fault-inject.c:154
       strncpy_from_user+0x36/0x270 lib/strncpy_from_user.c:118
       strncpy_from_user_nofault+0x71/0x140 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+0xe9/0x180 kernel/trace/bpf_trace.c:306
       bpf_prog_dc9e46813b54737d+0x49/0x54
       bpf_dispatcher_nop_func include/linux/bpf.h:1290 [inline]
       __bpf_prog_run include/linux/filter.h:701 [inline]
       bpf_prog_run include/linux/filter.h:708 [inline]
       __bpf_trace_run kernel/trace/bpf_trace.c:2362 [inline]
       bpf_trace_run2+0x2ee/0x540 kernel/trace/bpf_trace.c:2403
       trace_timer_start include/trace/events/timer.h:52 [inline]
       enqueue_timer+0x3ce/0x570 kernel/time/timer.c:662
       internal_add_timer kernel/time/timer.c:687 [inline]
       __mod_timer+0xa0e/0xeb0 kernel/time/timer.c:1182
       sk_reset_timer+0x23/0xc0 net/core/sock.c:3519
       tipc_sk_finish_conn+0x16b/0x820 net/tipc/socket.c:1671
       tipc_socketpair+0x25c/0x4b0 net/tipc/socket.c:3347
       __sys_socketpair+0x411/0x720 net/socket.c:1780
       __do_sys_socketpair net/socket.c:1816 [inline]
       __se_sys_socketpair net/socket.c:1813 [inline]
       __x64_sys_socketpair+0x9b/0xb0 net/socket.c:1813
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

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

 Possible unsafe locking scenario:

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

 *** DEADLOCK ***

2 locks held by syz.5.4772/26508:
 #0: ffff8880b872a718 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x112/0x240 kernel/time/timer.c:1050
 #1: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #1: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #1: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2361 [inline]
 #1: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: bpf_trace_run2+0x1fc/0x540 kernel/trace/bpf_trace.c:2403

stack backtrace:
CPU: 1 UID: 0 PID: 26508 Comm: syz.5.4772 Not tainted 6.13.0-rc5-syzkaller-00004-gccb98ccef0e5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074
 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206
 check_prev_add kernel/locking/lockdep.c:3161 [inline]
 check_prevs_add kernel/locking/lockdep.c:3280 [inline]
 validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
 down_trylock+0x20/0xa0 kernel/locking/semaphore.c:139
 __down_trylock_console_sem+0x109/0x250 kernel/printk/printk.c:326
 console_trylock kernel/printk/printk.c:2852 [inline]
 console_trylock_spinning kernel/printk/printk.c:2009 [inline]
 vprintk_emit+0x3d7/0xa10 kernel/printk/printk.c:2431
 _printk+0xd5/0x120 kernel/printk/printk.c:2457
 fail_dump lib/fault-inject.c:46 [inline]
 should_fail_ex+0x391/0x4e0 lib/fault-inject.c:154
 strncpy_from_user+0x36/0x270 lib/strncpy_from_user.c:118
 strncpy_from_user_nofault+0x71/0x140 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+0xe9/0x180 kernel/trace/bpf_trace.c:306
 bpf_prog_dc9e46813b54737d+0x49/0x54
 bpf_dispatcher_nop_func include/linux/bpf.h:1290 [inline]
 __bpf_prog_run include/linux/filter.h:701 [inline]
 bpf_prog_run include/linux/filter.h:708 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2362 [inline]
 bpf_trace_run2+0x2ee/0x540 kernel/trace/bpf_trace.c:2403
 trace_timer_start include/trace/events/timer.h:52 [inline]
 enqueue_timer+0x3ce/0x570 kernel/time/timer.c:662
 internal_add_timer kernel/time/timer.c:687 [inline]
 __mod_timer+0xa0e/0xeb0 kernel/time/timer.c:1182
 sk_reset_timer+0x23/0xc0 net/core/sock.c:3519
 tipc_sk_finish_conn+0x16b/0x820 net/tipc/socket.c:1671
 tipc_socketpair+0x25c/0x4b0 net/tipc/socket.c:3347
 __sys_socketpair+0x411/0x720 net/socket.c:1780
 __do_sys_socketpair net/socket.c:1816 [inline]
 __se_sys_socketpair net/socket.c:1813 [inline]
 __x64_sys_socketpair+0x9b/0xb0 net/socket.c:1813
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4b7b785d29
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:00007f4b7c603038 EFLAGS: 00000246 ORIG_RAX: 0000000000000035
RAX: ffffffffffffffda RBX: 00007f4b7b975fa0 RCX: 00007f4b7b785d29
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 000000000000001e
RBP: 00007f4b7c603090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000080 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007f4b7b975fa0 R15: 00007fff25367878
 </TASK>
CPU: 1 UID: 0 PID: 26508 Comm: syz.5.4772 Not tainted 6.13.0-rc5-syzkaller-00004-gccb98ccef0e5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 fail_dump lib/fault-inject.c:53 [inline]
 should_fail_ex+0x3b0/0x4e0 lib/fault-inject.c:154
 strncpy_from_user+0x36/0x270 lib/strncpy_from_user.c:118
 strncpy_from_user_nofault+0x71/0x140 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+0xe9/0x180 kernel/trace/bpf_trace.c:306
 bpf_prog_dc9e46813b54737d+0x49/0x54
 bpf_dispatcher_nop_func include/linux/bpf.h:1290 [inline]
 __bpf_prog_run include/linux/filter.h:701 [inline]
 bpf_prog_run include/linux/filter.h:708 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2362 [inline]
 bpf_trace_run2+0x2ee/0x540 kernel/trace/bpf_trace.c:2403
 trace_timer_start include/trace/events/timer.h:52 [inline]
 enqueue_timer+0x3ce/0x570 kernel/time/timer.c:662
 internal_add_timer kernel/time/timer.c:687 [inline]
 __mod_timer+0xa0e/0xeb0 kernel/time/timer.c:1182
 sk_reset_timer+0x23/0xc0 net/core/sock.c:3519
 tipc_sk_finish_conn+0x16b/0x820 net/tipc/socket.c:1671
 tipc_socketpair+0x25c/0x4b0 net/tipc/socket.c:3347
 __sys_socketpair+0x411/0x720 net/socket.c:1780
 __do_sys_socketpair net/socket.c:1816 [inline]
 __se_sys_socketpair net/socket.c:1813 [inline]
 __x64_sys_socketpair+0x9b/0xb0 net/socket.c:1813
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4b7b785d29
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:00007f4b7c603038 EFLAGS: 00000246 ORIG_RAX: 0000000000000035
RAX: ffffffffffffffda RBX: 00007f4b7b975fa0 RCX: 00007f4b7b785d29
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 000000000000001e
RBP: 00007f4b7c603090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000080 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007f4b7b975fa0 R15: 00007fff25367878
 </TASK>