rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (1 GPs behind) idle=ba3c/1/0x4000000000000000 softirq=66399/66400 fqs=4 rcu: (detected by 1, t=10505 jiffies, g=106221, q=920 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 20547 Comm: dhcpcd Not tainted 6.6.0-rc5-syzkaller-00067-g8182d7a3f1b8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 RIP: 0010:check_kcov_mode kernel/kcov.c:173 [inline] RIP: 0010:write_comp_data kernel/kcov.c:236 [inline] RIP: 0010:__sanitizer_cov_trace_const_cmp1+0x17/0x90 kernel/kcov.c:290 Code: 48 89 7c 11 10 48 89 74 11 18 4c 89 44 11 20 c3 0f 1f 00 f3 0f 1e fa 4c 8b 04 24 65 48 8b 15 20 ab 75 7e 65 8b 05 21 ab 75 7e 00 01 ff 00 74 10 a9 00 01 00 00 74 5b 83 ba 04 16 00 00 00 74 RSP: 0018:ffffc90000007b98 EFLAGS: 00000046 RAX: 0000000080010000 RBX: 0000000000000001 RCX: ffffffff88b55081 RDX: ffff8880223b5940 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90000007c80 R08: ffffffff88b550aa R09: 1ffff11006971c2b R10: dffffc0000000000 R11: ffffed1006971c2c R12: ffff888034b8e000 R13: dffffc0000000000 R14: 1ffff92000000f78 R15: ffff888034b8e300 FS: 00007f5e1948a740(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5e1948aa10 CR3: 000000007c30e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: arch_test_and_set_bit arch/x86/include/asm/bitops.h:138 [inline] test_and_set_bit include/asm-generic/bitops/instrumented-atomic.h:72 [inline] __netif_schedule+0xba/0x310 net/core/dev.c:3106 advance_sched+0xac1/0xcb0 net/sched/sch_taprio.c:997 __run_hrtimer kernel/time/hrtimer.c:1688 [inline] __hrtimer_run_queues+0x59f/0xd10 kernel/time/hrtimer.c:1752 hrtimer_interrupt+0x396/0x980 kernel/time/hrtimer.c:1814 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1063 [inline] __sysvec_apic_timer_interrupt+0x104/0x390 arch/x86/kernel/apic/apic.c:1080 sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1074 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:lock_is_held_type+0x51/0x190 kernel/locking/lockdep.c:5817 Code: 60 e7 cb 03 00 0f 84 00 01 00 00 65 8b 05 bf 09 34 75 85 c0 0f 85 f1 00 00 00 65 4c 8b 2d 37 39 35 75 41 83 bd c4 0a 00 00 00 <0f> 85 db 00 00 00 41 89 f6 49 89 ff 48 c7 04 24 00 00 00 00 9c 8f RSP: 0018:ffffc900165c7ad8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff88803896d720 RCX: ffff8880223b5940 RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffff88803896d720 RBP: 00000000ffffffff R08: ffffffff8ac49254 R09: ffffffff8ac49165 R10: 0000000000000003 R11: ffff8880223b5940 R12: 0000000000000004 R13: ffff8880223b5940 R14: 00007f5e1948a000 R15: ffff88807a0dc200 lock_is_held include/linux/lockdep.h:288 [inline] mt_locked lib/maple_tree.c:805 [inline] mt_slot lib/maple_tree.c:812 [inline] mtree_range_walk+0x4d5/0x7e0 lib/maple_tree.c:2827 mas_state_walk lib/maple_tree.c:3712 [inline] mt_find+0x380/0x7c0 lib/maple_tree.c:6531 find_vma+0x13e/0x1c0 mm/mmap.c:1857 lock_mm_and_find_vma+0x5f/0x2d0 mm/memory.c:5374 do_user_addr_fault arch/x86/mm/fault.c:1385 [inline] handle_page_fault arch/x86/mm/fault.c:1505 [inline] exc_page_fault+0x1b2/0x860 arch/x86/mm/fault.c:1561 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0010:__put_user_4+0x11/0x20 arch/x86/lib/putuser.S:89 Code: 01 ca c3 66 0f 1f 44 00 00 f3 0f 1e fa 0f 01 cb 66 89 01 31 c9 0f 01 ca c3 f3 0f 1e fa 48 89 cb 48 c1 fb 3f 48 09 d9 0f 01 cb <89> 01 31 c9 0f 01 ca c3 0f 1f 80 00 00 00 00 f3 0f 1e fa 0f 01 cb RSP: 0018:ffffc900165c7f00 EFLAGS: 00050202 RAX: 0000000000005043 RBX: 0000000000000000 RCX: 00007f5e1948aa10 RDX: 0000000000000000 RSI: ffffffff8b0ab620 RDI: ffffffff8b5982e0 RBP: ffff8880223b5fb8 R08: ffffffff8e9a322f R09: 1ffffffff1d34645 R10: dffffc0000000000 R11: fffffbfff1d34646 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000005043 R15: dffffc0000000000 schedule_tail+0x95/0xb0 kernel/sched/core.c:5315 ret_from_fork+0x24/0x80 arch/x86/kernel/process.c:143 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 rcu: rcu_preempt kthread starved for 10485 jiffies! g106221 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:R running task stack:26184 pid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5382 [inline] __schedule+0x196c/0x4af0 kernel/sched/core.c:6695 schedule+0xc3/0x180 kernel/sched/core.c:6771 schedule_timeout+0x1bd/0x300 kernel/time/timer.c:2167 rcu_gp_fqs_loop+0x2c6/0x1010 kernel/rcu/tree.c:1613 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:1812 kthread+0x2d3/0x370 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 rcu: Stack dump where RCU GP kthread last ran: CPU: 1 PID: 20554 Comm: syz-executor.2 Not tainted 6.6.0-rc5-syzkaller-00067-g8182d7a3f1b8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 RIP: 0010:csd_lock_wait kernel/smp.c:300 [inline] RIP: 0010:smp_call_function_many_cond+0x180e/0x2890 kernel/smp.c:844 Code: 01 31 ff e8 64 59 0b 00 41 83 e4 01 49 bc 00 00 00 00 00 fc ff df 75 07 e8 9f 55 0b 00 eb 38 f3 90 42 0f b6 04 23 84 c0 75 11 <41> f7 45 00 01 00 00 00 74 1e e8 83 55 0b 00 eb e4 44 89 e9 80 e1 RSP: 0018:ffffc900165d7400 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 1ffff110173087b9 RCX: 0000000000040000 RDX: ffffc90005011000 RSI: 000000000003ffff RDI: 0000000000040000 RBP: ffffc900165d7600 R08: ffffffff8182b54c R09: 1ffffffff20dee70 R10: dffffc0000000000 R11: fffffbfff20dee71 R12: dffffc0000000000 R13: ffff8880b9843dc8 R14: ffff8880b993d440 R15: 0000000000000000 FS: 00007f5d81d0f6c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2ff22000 CR3: 000000007cb10000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1012 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:1993 [inline] text_poke_bp_batch+0x350/0xb20 arch/x86/kernel/alternative.c:2203 text_poke_bp+0xb0/0xf0 arch/x86/kernel/alternative.c:2430 __static_call_transform+0x40d/0x660 arch/x86/kernel/static_call.c:111 arch_static_call_transform+0x13f/0x380 arch/x86/kernel/static_call.c:163 __static_call_update+0xd8/0x5d0 kernel/static_call_inline.c:147 tracepoint_update_call kernel/tracepoint.c:317 [inline] tracepoint_add_func+0x90c/0x9d0 kernel/tracepoint.c:358 tracepoint_probe_register_prio_may_exist+0x122/0x190 kernel/tracepoint.c:482 bpf_raw_tp_link_attach+0x470/0x6d0 kernel/bpf/syscall.c:3626 bpf_raw_tracepoint_open+0x199/0x210 kernel/bpf/syscall.c:3653 __sys_bpf+0x36c/0x810 kernel/bpf/syscall.c:5377 __do_sys_bpf kernel/bpf/syscall.c:5439 [inline] __se_sys_bpf kernel/bpf/syscall.c:5437 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5437 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f5d8107cae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f5d81d0f0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f5d8119bf80 RCX: 00007f5d8107cae9 RDX: 0000000000000010 RSI: 0000000020000200 RDI: 0000000000000011 RBP: 00007f5d810c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f5d8119bf80 R15: 00007ffc741b3058