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program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 529.848142][ T3238] [ 529.850523][ T3238] ====================================================== [ 529.857521][ T3238] WARNING: possible circular locking dependency detected [ 529.864525][ T3238] 5.15.164-syzkaller #0 Not tainted [ 529.869707][ T3238] ------------------------------------------------------ [ 529.876701][ T3238] dhcpcd/3238 is trying to acquire lock: [ 529.882391][ T3238] ffff8880b9a35bb8 (lock#8){+.+.}-{2:2}, at: local_lock_acquire+0xd/0x170 [ 529.890921][ T3238] [ 529.890921][ T3238] but task is already holding lock: [ 529.898278][ T3238] ffff8880b9a3a358 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 [ 529.907747][ T3238] [ 529.907747][ T3238] which lock already depends on the new lock. [ 529.907747][ T3238] [ 529.918152][ T3238] [ 529.918152][ T3238] the existing dependency chain (in reverse order) is: [ 529.927157][ T3238] [ 529.927157][ T3238] -> #2 (&rq->__lock){-.-.}-{2:2}: [ 529.934433][ T3238] lock_acquire+0x1db/0x4f0 [ 529.939440][ T3238] _raw_spin_lock_nested+0x2d/0x40 [ 529.945061][ T3238] raw_spin_rq_lock_nested+0x26/0x140 [ 529.950932][ T3238] task_fork_fair+0x5d/0x350 [ 529.956020][ T3238] sched_cgroup_fork+0x2d3/0x330 [ 529.961461][ T3238] copy_process+0x224a/0x3ef0 [ 529.966638][ T3238] kernel_clone+0x210/0x960 [ 529.971639][ T3238] kernel_thread+0x168/0x1e0 [ 529.976724][ T3238] rest_init+0x21/0x330 [ 529.981380][ T3238] start_kernel+0x48c/0x540 [ 529.986385][ T3238] secondary_startup_64_no_verify+0xb1/0xbb [ 529.992870][ T3238] [ 529.992870][ T3238] -> #1 (&p->pi_lock){-.-.}-{2:2}: [ 530.000144][ T3238] lock_acquire+0x1db/0x4f0 [ 530.005234][ T3238] _raw_spin_lock_irqsave+0xd1/0x120 [ 530.011019][ T3238] try_to_wake_up+0xae/0x1300 [ 530.016197][ T3238] rcu_read_unlock_special+0x3aa/0x520 [ 530.022155][ T3238] __rcu_read_unlock+0x92/0x100 [ 530.027686][ T3238] get_mem_cgroup_from_mm+0x179/0x260 [ 530.033559][ T3238] get_mm_memcg_path+0x1b/0x550 [ 530.038915][ T3238] __mmap_lock_do_trace_acquire_returned+0x84/0x340 [ 530.046023][ T3238] exc_page_fault+0x564/0x700 [ 530.051212][ T3238] asm_exc_page_fault+0x22/0x30 [ 530.056563][ T3238] __put_user_nocheck_8+0x3/0x21 [ 530.062002][ T3238] __rseq_handle_notify_resume+0x605/0x1250 [ 530.068395][ T3238] exit_to_user_mode_loop+0xdc/0x130 [ 530.074178][ T3238] exit_to_user_mode_prepare+0xb1/0x140 [ 530.080263][ T3238] syscall_exit_to_user_mode+0x5d/0x240 [ 530.086314][ T3238] do_syscall_64+0x47/0xb0 [ 530.091321][ T3238] entry_SYSCALL_64_after_hwframe+0x66/0xd0 [ 530.097713][ T3238] [ 530.097713][ T3238] -> #0 (lock#8){+.+.}-{2:2}: [ 530.104563][ T3238] validate_chain+0x1649/0x5930 [ 530.109936][ T3238] __lock_acquire+0x1295/0x1ff0 [ 530.115293][ T3238] lock_acquire+0x1db/0x4f0 [ 530.120291][ T3238] local_lock_acquire+0x29/0x170 [ 530.125731][ T3238] __mmap_lock_do_trace_acquire_returned+0x7c/0x340 [ 530.132821][ T3238] stack_map_get_build_id_offset+0x612/0x930 [ 530.139302][ T3238] __bpf_get_stack+0x495/0x570 [ 530.144563][ T3238] bpf_get_stack_raw_tp+0x1b2/0x220 [ 530.150257][ T3238] bpf_prog_ec3b2eefa702d8d3+0x3a/0xcf4 [ 530.156300][ T3238] bpf_trace_run2+0x19e/0x340 [ 530.161515][ T3238] trace_tlb_flush+0xed/0x110 [ 530.166709][ T3238] switch_mm_irqs_off+0x748/0xa30 [ 530.172241][ T3238] __schedule+0x1167/0x45b0 [ 530.177247][ T3238] schedule+0x11b/0x1f0 [ 530.181902][ T3238] schedule_hrtimeout_range_clock+0x2b3/0x4a0 [ 530.188469][ T3238] poll_schedule_timeout+0x10c/0x150 [ 530.194257][ T3238] do_sys_poll+0xd61/0x11f0 [ 530.199259][ T3238] __se_sys_ppoll+0x29c/0x330 [ 530.204438][ T3238] do_syscall_64+0x3b/0xb0 [ 530.209352][ T3238] entry_SYSCALL_64_after_hwframe+0x66/0xd0 [ 530.215770][ T3238] [ 530.215770][ T3238] other info that might help us debug this: [ 530.215770][ T3238] [ 530.226068][ T3238] Chain exists of: [ 530.226068][ T3238] lock#8 --> &p->pi_lock --> &rq->__lock [ 530.226068][ T3238] [ 530.237835][ T3238] Possible unsafe locking scenario: [ 530.237835][ T3238] [ 530.245272][ T3238] CPU0 CPU1 [ 530.250611][ T3238] ---- ---- [ 530.255951][ T3238] lock(&rq->__lock); [ 530.260004][ T3238] lock(&p->pi_lock); [ 530.266572][ T3238] lock(&rq->__lock); [ 530.273136][ T3238] lock(lock#8); [ 530.276751][ T3238] [ 530.276751][ T3238] *** DEADLOCK *** [ 530.276751][ T3238] [ 530.284893][ T3238] 3 locks held by dhcpcd/3238: [ 530.289630][ T3238] #0: ffff8880b9a3a358 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 [ 530.299527][ T3238] #1: ffffffff8c91fb20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 [ 530.308901][ T3238] #2: ffff888019a5b228 (&mm->mmap_lock){++++}-{3:3}, at: stack_map_get_build_id_offset+0x23e/0x930 [ 530.319660][ T3238] [ 530.319660][ T3238] stack backtrace: [ 530.325536][ T3238] CPU: 0 PID: 3238 Comm: dhcpcd Not tainted 5.15.164-syzkaller #0 [ 530.333318][ T3238] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 [ 530.343451][ T3238] Call Trace: [ 530.346799][ T3238] [ 530.349712][ T3238] dump_stack_lvl+0x1e3/0x2d0 [ 530.354380][ T3238] ? io_uring_drop_tctx_refs+0x1a0/0x1a0 [ 530.360000][ T3238] ? print_circular_bug+0x12b/0x1a0 [ 530.365275][ T3238] check_noncircular+0x2f8/0x3b0 [ 530.370198][ T3238] ? trace_pelt_cfs_tp+0x3c/0x110 [ 530.375205][ T3238] ? add_chain_block+0x850/0x850 [ 530.380122][ T3238] ? lockdep_lock+0x11f/0x2a0 [ 530.384801][ T3238] ? enqueue_entity+0x9e0/0x1ec0 [ 530.389718][ T3238] validate_chain+0x1649/0x5930 [ 530.394553][ T3238] ? reacquire_held_locks+0x660/0x660 [ 530.399990][ T3238] ? do_raw_spin_unlock+0x137/0x8b0 [ 530.405169][ T3238] ? mark_lock+0x98/0x340 [ 530.409483][ T3238] ? mark_lock+0x98/0x340 [ 530.413790][ T3238] __lock_acquire+0x1295/0x1ff0 [ 530.418623][ T3238] lock_acquire+0x1db/0x4f0 [ 530.423259][ T3238] ? local_lock_acquire+0xd/0x170 [ 530.428300][ T3238] ? read_lock_is_recursive+0x10/0x10 [ 530.433667][ T3238] ? down_read_trylock+0x24a/0x3b0 [ 530.438758][ T3238] ? stack_map_get_build_id_offset+0x23e/0x930 [ 530.444891][ T3238] local_lock_acquire+0x29/0x170 [ 530.449811][ T3238] ? local_lock_acquire+0xd/0x170 [ 530.454813][ T3238] __mmap_lock_do_trace_acquire_returned+0x7c/0x340 [ 530.461399][ T3238] ? stack_map_get_build_id_offset+0x601/0x930 [ 530.467574][ T3238] stack_map_get_build_id_offset+0x612/0x930 [ 530.473571][ T3238] ? __bpf_get_stackid+0x910/0x910 [ 530.478671][ T3238] __bpf_get_stack+0x495/0x570 [ 530.483432][ T3238] ? stack_map_get_build_id_offset+0x930/0x930 [ 530.489592][ T3238] ? __cant_sleep+0x270/0x270 [ 530.494271][ T3238] bpf_get_stack_raw_tp+0x1b2/0x220 [ 530.499454][ T3238] bpf_prog_ec3b2eefa702d8d3+0x3a/0xcf4 [ 530.504976][ T3238] bpf_trace_run2+0x19e/0x340 [ 530.509634][ T3238] ? bpf_trace_run1+0x2f0/0x2f0 [ 530.514462][ T3238] ? psi_group_change+0xafa/0x1180 [ 530.519553][ T3238] trace_tlb_flush+0xed/0x110 [ 530.524208][ T3238] switch_mm_irqs_off+0x748/0xa30 [ 530.529212][ T3238] ? switch_mm+0x190/0x190 [ 530.533606][ T3238] __schedule+0x1167/0x45b0 [ 530.538092][ T3238] ? print_irqtrace_events+0x210/0x210 [ 530.543532][ T3238] ? release_firmware_map_entry+0x190/0x190 [ 530.549407][ T3238] ? lockdep_hardirqs_on+0x94/0x130 [ 530.554593][ T3238] ? _raw_spin_unlock_irqrestore+0xd9/0x130 [ 530.560481][ T3238] ? _raw_spin_unlock+0x40/0x40 [ 530.565349][ T3238] schedule+0x11b/0x1f0 [ 530.569507][ T3238] schedule_hrtimeout_range_clock+0x2b3/0x4a0 [ 530.575556][ T3238] ? hrtimer_nanosleep_restart+0x420/0x420 [ 530.581343][ T3238] ? __remove_hrtimer+0x4b0/0x4b0 [ 530.586344][ T3238] ? unix_dgram_poll+0x40c/0x640 [ 530.591261][ T3238] poll_schedule_timeout+0x10c/0x150 [ 530.596538][ T3238] do_sys_poll+0xd61/0x11f0 [ 530.601047][ T3238] ? poll_select_finish+0x7b0/0x7b0 [ 530.606227][ T3238] ? __x64_compat_sys_ppoll_time64+0xc0/0xc0 [ 530.612190][ T3238] ? __x64_compat_sys_ppoll_time64+0xc0/0xc0 [ 530.618248][ T3238] ? __x64_compat_sys_ppoll_time64+0xc0/0xc0 [ 530.624237][ T3238] ? __x64_compat_sys_ppoll_time64+0xc0/0xc0 [ 530.630225][ T3238] ? do_raw_spin_unlock+0x137/0x8b0 [ 530.635403][ T3238] ? _raw_spin_unlock_irq+0x1f/0x40 [ 530.640579][ T3238] ? lockdep_hardirqs_on+0x94/0x130 [ 530.645754][ T3238] ? _raw_spin_unlock_irq+0x2a/0x40 [ 530.650935][ T3238] ? sigprocmask+0x280/0x280 [ 530.655501][ T3238] ? __lock_acquire+0x1ff0/0x1ff0 [ 530.660504][ T3238] __se_sys_ppoll+0x29c/0x330 [ 530.665162][ T3238] ? __x64_sys_ppoll+0xc0/0xc0 [ 530.669908][ T3238] ? __x64_sys_ppoll+0x1c/0xc0 [ 530.674647][ T3238] do_syscall_64+0x3b/0xb0 [ 530.679128][ T3238] ? clear_bhb_loop+0x15/0x70 [ 530.683795][ T3238] entry_SYSCALL_64_after_hwframe+0x66/0xd0 [ 530.689677][ T3238] RIP: 0033:0x7fbfd01b4ad5 [ 530.694072][ T3238] Code: Unable to access opcode bytes at RIP 0x7fbfd01b4aab. [ 530.701410][ T3238] RSP: 002b:00007fff49517ca0 EFLAGS: 00000246 ORIG_RAX: 000000000000010f [ 530.709804][ T3238] RAX: ffffffffffffffda RBX: 000055756b7cae20 RCX: 00007fbfd01b4ad5 [ 530.717754][ T3238] RDX: 00007fff49517cc0 RSI: 0000000000000004 RDI: 000055756b7d5b60 [ 530.725704][ T3238] RBP: 00007fff49517ff0 R08: 0000000000000008 R09: 0000000000000010 [ 530.733653][ T3238] R10: 00007fff49517ff0 R11: 0000000000000246 R12: 00007fff49517ce8 [ 530.741603][ T3238] R13: 0000557569a88610 R14: 0000000000000000 R15: 0000000000000000 executing program executing program [ 530.749645][ T3238] executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program