rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (1 GPs behind) idle=02fc/1/0x4000000000000000 softirq=105005/105007 fqs=2 rcu: (detected by 1, t=10505 jiffies, g=155313, q=322 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 30340 Comm: kworker/u4:4 Not tainted 6.6.0-rc4-syzkaller-00176-gb78b18fb8ee1 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 Workqueue: bat_events batadv_nc_worker RIP: 0010:check_region_inline mm/kasan/generic.c:167 [inline] RIP: 0010:kasan_check_range+0x14c/0x190 mm/kasan/generic.c:187 Code: c0 01 49 89 d3 48 39 d0 74 11 80 38 00 74 ef 4d 8d 1c 2c 48 85 c0 48 89 c2 75 97 48 89 da 4c 89 d8 4c 29 da e9 30 ff ff ff 5b 01 00 00 00 5d 41 5c c3 b8 01 00 00 00 c3 48 29 c3 48 89 da 49 RSP: 0018:ffffc90000007a98 EFLAGS: 00000046 RAX: fffffbfff233cfd1 RBX: 0000000000000000 RCX: ffffffff816729cf RDX: fffffbfff233cfd1 RSI: 0000000000000008 RDI: ffffffff919e7e80 RBP: fffffbfff233cfd0 R08: 0000000000000000 R09: fffffbfff233cfd0 R10: ffffffff919e7e87 R11: ffffc90000007ff8 R12: ffff8880770b8bca R13: ffff8880770b8ba8 R14: 000000004f5c098b R15: 0000000000000003 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2432afad58 CR3: 000000004d411000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: instrument_atomic_read include/linux/instrumented.h:68 [inline] _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] hlock_class kernel/locking/lockdep.c:228 [inline] __lock_acquire+0xc8f/0x5de0 kernel/locking/lockdep.c:5133 lock_acquire kernel/locking/lockdep.c:5753 [inline] lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5718 debug_objects_fill_pool lib/debugobjects.c:614 [inline] debug_object_activate+0x144/0x490 lib/debugobjects.c:713 debug_hrtimer_activate kernel/time/hrtimer.c:422 [inline] debug_activate kernel/time/hrtimer.c:477 [inline] enqueue_hrtimer+0x23/0x310 kernel/time/hrtimer.c:1087 __run_hrtimer kernel/time/hrtimer.c:1705 [inline] __hrtimer_run_queues+0xa0a/0xc10 kernel/time/hrtimer.c:1752 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1814 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1063 [inline] __sysvec_apic_timer_interrupt+0x105/0x3f0 arch/x86/kernel/apic/apic.c:1080 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1074 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:instrument_atomic_read_write include/linux/instrumented.h:96 [inline] RIP: 0010:atomic_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:1294 [inline] RIP: 0010:queued_spin_lock include/asm-generic/qspinlock.h:111 [inline] RIP: 0010:do_raw_spin_lock+0x10a/0x2b0 kernel/locking/spinlock_debug.c:115 Code: b6 14 02 4c 89 e0 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 65 01 00 00 8b 53 08 65 8b 05 6a c1 9b 7e 39 c2 0f 84 32 01 00 00 <48> 89 df be 04 00 00 00 c7 44 24 28 00 00 00 00 e8 81 c1 73 00 be RSP: 0018:ffffc900037bfaa8 EFLAGS: 00000286 RAX: 0000000000000000 RBX: ffff8880379f5a00 RCX: 0000000000000001 RDX: 00000000ffffffff RSI: ffffffff8a8c9ea0 RDI: ffff8880379f5a04 RBP: 1ffff920006f7f56 R08: 0000000000000000 R09: fffffbfff233cfec R10: ffffffff919e7f67 R11: 0000000000000000 R12: ffff8880379f5a08 R13: ffff8880379f5a10 R14: ffff88804dafd580 R15: ffff88802c55eb40 spin_lock_bh include/linux/spinlock.h:356 [inline] batadv_nc_purge_paths+0xd3/0x3c0 net/batman-adv/network-coding.c:442 batadv_nc_worker+0x9b1/0x10e0 net/batman-adv/network-coding.c:722 process_one_work+0x884/0x15c0 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784 kthread+0x33c/0x440 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 rcu: rcu_preempt kthread starved for 10495 jiffies! g155313 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:28432 pid:16 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5382 [inline] __schedule+0xee1/0x5a10 kernel/sched/core.c:6695 schedule+0xe7/0x1b0 kernel/sched/core.c:6771 schedule_timeout+0x157/0x2c0 kernel/time/timer.c:2167 rcu_gp_fqs_loop+0x1ec/0xa50 kernel/rcu/tree.c:1613 rcu_gp_kthread+0x249/0x380 kernel/rcu/tree.c:1812 kthread+0x33c/0x440 kernel/kthread.c:388 ret_from_fork+0x45/0x80 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: 30643 Comm: syz-executor.0 Not tainted 6.6.0-rc4-syzkaller-00176-gb78b18fb8ee1 #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+0x4d6/0x1570 kernel/smp.c:844 Code: 0b 00 85 ed 74 4d 48 b8 00 00 00 00 00 fc ff df 4d 89 fc 4c 89 fd 49 c1 ec 03 83 e5 07 49 01 c4 83 c5 03 e8 4c 8b 0b 00 f3 90 <41> 0f b6 04 24 40 38 c5 7c 08 84 c0 0f 85 3c 0e 00 00 8b 43 08 31 RSP: 0018:ffffc9000371f530 EFLAGS: 00000246 RAX: 0000000000040000 RBX: ffff8880b98414c0 RCX: ffffc9000b755000 RDX: 0000000000040000 RSI: ffffffff817b39c4 RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffffed1017308299 R13: 0000000000000001 R14: ffff8880b993d900 R15: ffff8880b98414c8 FS: 00007f10a69dd6c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002057f000 CR3: 000000004829a000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1012 __purge_vmap_area_lazy+0x203/0x2160 mm/vmalloc.c:1749 _vm_unmap_aliases+0x693/0x9b0 mm/vmalloc.c:2306 change_page_attr_set_clr+0x24a/0x490 arch/x86/mm/pat/set_memory.c:1838 change_page_attr_clear arch/x86/mm/pat/set_memory.c:1886 [inline] set_memory_ro+0x7c/0xa0 arch/x86/mm/pat/set_memory.c:2077 bpf_prog_lock_ro include/linux/filter.h:847 [inline] bpf_prog_select_runtime+0x4f7/0x640 kernel/bpf/core.c:2363 bpf_prog_load+0x156e/0x2260 kernel/bpf/syscall.c:2712 __sys_bpf+0xbb6/0x4e60 kernel/bpf/syscall.c:5335 __do_sys_bpf kernel/bpf/syscall.c:5439 [inline] __se_sys_bpf kernel/bpf/syscall.c:5437 [inline] __x64_sys_bpf+0x78/0xc0 kernel/bpf/syscall.c:5437 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f10a807cae9 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:00007f10a69dd0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f10a819c1f0 RCX: 00007f10a807cae9 RDX: 0000000000000090 RSI: 0000000020000200 RDI: 0000000000000005 RBP: 00007f10a80c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f10a819c1f0 R15: 00007fff57a62d08