======================================================
WARNING: possible circular locking dependency detected
6.1.87-syzkaller #0 Not tainted
------------------------------------------------------
dhcpcd/3216 is trying to acquire lock:
ffff8880b9835e90 (lock#9){+.+.}-{2:2}, at: local_lock_acquire include/linux/local_lock_internal.h:29 [inline]
ffff8880b9835e90 (lock#9){+.+.}-{2:2}, at: __mmap_lock_do_trace_acquire_returned+0x84/0x670 mm/mmap_lock.c:237
but task is already holding lock:
ffff8880b983aa18 (&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:
-> #3 (&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:1354 [inline]
rq_lock kernel/sched/sched.h:1644 [inline]
task_fork_fair+0x5d/0x350 kernel/sched/fair.c:11869
sched_cgroup_fork+0x374/0x400 kernel/sched/core.c:4686
copy_process+0x2442/0x4060 kernel/fork.c:2384
kernel_clone+0x222/0x920 kernel/fork.c:2682
user_mode_thread+0x12e/0x190 kernel/fork.c:2758
rest_init+0x23/0x300 init/main.c:697
start_kernel+0x0/0x53f init/main.c:892
start_kernel+0x496/0x53f init/main.c:1139
secondary_startup_64_no_verify+0xcf/0xdb
-> #2 (&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/0x12e0 kernel/sched/core.c:4112
signal_wake_up_state kernel/signal.c:780 [inline]
signal_wake_up include/linux/sched/signal.h:457 [inline]
complete_signal+0x796/0xbd0 kernel/signal.c:1074
__send_signal_locked+0xb1a/0xdc0 kernel/signal.c:1194
do_notify_parent+0xe2b/0x1100 kernel/signal.c:2120
exit_notify kernel/exit.c:744 [inline]
do_exit+0x172e/0x26a0 kernel/exit.c:889
do_group_exit+0x202/0x2b0 kernel/exit.c:1019
__do_sys_exit_group kernel/exit.c:1030 [inline]
__se_sys_exit_group kernel/exit.c:1028 [inline]
__x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1028
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
-> #1 (&sighand->siglock){....}-{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
__lock_task_sighand+0x145/0x2d0 kernel/signal.c:1410
lock_task_sighand include/linux/sched/signal.h:745 [inline]
do_send_sig_info kernel/signal.c:1299 [inline]
group_send_sig_info+0x26c/0x300 kernel/signal.c:1448
bpf_send_signal_common+0x2d8/0x420 kernel/trace/bpf_trace.c:882
____bpf_send_signal kernel/trace/bpf_trace.c:887 [inline]
bpf_send_signal+0x15/0x20 kernel/trace/bpf_trace.c:885
0xffffffffa000096e
bpf_dispatcher_nop_func include/linux/bpf.h:989 [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:2273 [inline]
bpf_trace_run4+0x253/0x470 kernel/trace/bpf_trace.c:2314
trace_mmap_lock_acquire_returned include/trace/events/mmap_lock.h:52 [inline]
__mmap_lock_do_trace_acquire_returned+0x5e3/0x670 mm/mmap_lock.c:237
__mmap_lock_trace_acquire_returned include/linux/mmap_lock.h:36 [inline]
mmap_read_trylock include/linux/mmap_lock.h:137 [inline]
get_mmap_lock_carefully mm/memory.c:5304 [inline]
lock_mm_and_find_vma+0x219/0x2e0 mm/memory.c:5366
do_user_addr_fault arch/x86/mm/fault.c:1343 [inline]
handle_page_fault arch/x86/mm/fault.c:1462 [inline]
exc_page_fault+0x169/0x660 arch/x86/mm/fault.c:1518
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570
strncpy_from_user+0x159/0x360 lib/strncpy_from_user.c:139
strncpy_from_bpfptr include/linux/bpfptr.h:85 [inline]
bpf_prog_load+0x188/0x1bb0 kernel/bpf/syscall.c:2515
__sys_bpf+0x382/0x6c0 kernel/bpf/syscall.c:5005
__do_sys_bpf kernel/bpf/syscall.c:5109 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5107 [inline]
__x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5107
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
-> #0 (lock#9){+.+.}-{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
local_lock_acquire include/linux/local_lock_internal.h:29 [inline]
__mmap_lock_do_trace_acquire_returned+0x9d/0x670 mm/mmap_lock.c:237
__mmap_lock_trace_acquire_returned include/linux/mmap_lock.h:36 [inline]
mmap_read_trylock include/linux/mmap_lock.h:137 [inline]
stack_map_get_build_id_offset+0x99e/0x9c0 kernel/bpf/stackmap.c:144
__bpf_get_stack+0x495/0x570 kernel/bpf/stackmap.c:452
____bpf_get_stack_raw_tp kernel/trace/bpf_trace.c:1877 [inline]
bpf_get_stack_raw_tp+0x1b2/0x220 kernel/trace/bpf_trace.c:1867
bpf_prog_e6cf5f9c69743609+0x3a/0x3e
bpf_dispatcher_nop_func include/linux/bpf.h:989 [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:2273 [inline]
bpf_trace_run4+0x253/0x470 kernel/trace/bpf_trace.c:2314
trace_sched_switch include/trace/events/sched.h:222 [inline]
__schedule+0x2116/0x4550 kernel/sched/core.c:6555
schedule+0xbf/0x180 kernel/sched/core.c:6634
schedule_hrtimeout_range_clock+0x2a4/0x480 kernel/time/hrtimer.c:2308
poll_schedule_timeout fs/select.c:244 [inline]
do_poll fs/select.c:965 [inline]
do_sys_poll+0xe1c/0x1330 fs/select.c:1015
__do_sys_ppoll fs/select.c:1121 [inline]
__se_sys_ppoll+0x29c/0x330 fs/select.c:1101
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:
lock#9 --> &p->pi_lock --> &rq->__lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&rq->__lock);
lock(&p->pi_lock);
lock(&rq->__lock);
lock(lock#9);
*** DEADLOCK ***
3 locks held by dhcpcd/3216:
#0: ffff8880b983aa18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:537
#1: ffffffff8d12ac80 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
#1: ffffffff8d12ac80 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
#1: ffffffff8d12ac80 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2272 [inline]
#1: ffffffff8d12ac80 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run4+0x16a/0x470 kernel/trace/bpf_trace.c:2314
#2: ffff88801874a6d8 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
#2: ffff88801874a6d8 (&mm->mmap_lock){++++}-{3:3}, at: stack_map_get_build_id_offset+0x232/0x9c0 kernel/bpf/stackmap.c:144
stack backtrace:
CPU: 0 PID: 3216 Comm: dhcpcd Not tainted 6.1.87-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
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
local_lock_acquire include/linux/local_lock_internal.h:29 [inline]
__mmap_lock_do_trace_acquire_returned+0x9d/0x670 mm/mmap_lock.c:237
__mmap_lock_trace_acquire_returned include/linux/mmap_lock.h:36 [inline]
mmap_read_trylock include/linux/mmap_lock.h:137 [inline]
stack_map_get_build_id_offset+0x99e/0x9c0 kernel/bpf/stackmap.c:144
__bpf_get_stack+0x495/0x570 kernel/bpf/stackmap.c:452
____bpf_get_stack_raw_tp kernel/trace/bpf_trace.c:1877 [inline]
bpf_get_stack_raw_tp+0x1b2/0x220 kernel/trace/bpf_trace.c:1867
bpf_prog_e6cf5f9c69743609+0x3a/0x3e
bpf_dispatcher_nop_func include/linux/bpf.h:989 [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:2273 [inline]
bpf_trace_run4+0x253/0x470 kernel/trace/bpf_trace.c:2314
trace_sched_switch include/trace/events/sched.h:222 [inline]
__schedule+0x2116/0x4550 kernel/sched/core.c:6555
schedule+0xbf/0x180 kernel/sched/core.c:6634
schedule_hrtimeout_range_clock+0x2a4/0x480 kernel/time/hrtimer.c:2308
poll_schedule_timeout fs/select.c:244 [inline]
do_poll fs/select.c:965 [inline]
do_sys_poll+0xe1c/0x1330 fs/select.c:1015
__do_sys_ppoll fs/select.c:1121 [inline]
__se_sys_ppoll+0x29c/0x330 fs/select.c:1101
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: 0033:0x7f391315bad5
Code: 85 d2 74 0d 0f 10 02 48 8d 54 24 20 0f 11 44 24 20 64 8b 04 25 18 00 00 00 85 c0 75 27 41 b8 08 00 00 00 b8 0f 01 00 00 0f 05 <48> 3d 00 f0 ff ff 76 75 48 8b 15 24 73 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffe794f2ea0 EFLAGS: 00000246 ORIG_RAX: 000000000000010f
RAX: ffffffffffffffda RBX: 000055cffd8eee20 RCX: 00007f391315bad5
RDX: 00007ffe794f2ec0 RSI: 0000000000000004 RDI: 000055cffd8f9b60
RBP: 00007ffe794f31f0 R08: 0000000000000008 R09: 0000000000000010
R10: 00007ffe794f31f0 R11: 0000000000000246 R12: 00007ffe794f2ee8
R13: 000055cffd3b9610 R14: 0000000000000000 R15: 0000000000000000
</TASK>