rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P1091/1:b..l P5207/1:b..l rcu: (detected by 1, t=10502 jiffies, g=27501, q=334 ncpus=2) task:udevd state:R running task stack:24192 pid:5207 tgid:5207 ppid:1 flags:0x00000002 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0xe58/0x5ad0 kernel/sched/core.c:6756 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7078 irqentry_exit+0x36/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:lock_acquire.part.0+0xc/0x380 kernel/locking/lockdep.c:5814 Code: 1f ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 57 4d 89 cf 41 56 41 89 f6 41 55 <49> 89 fd 41 54 41 89 d4 48 ba 00 00 00 00 00 fc ff df 55 53 48 81 RSP: 0018:ffffc900048874c8 EFLAGS: 00000292 RAX: 0000000000000001 RBX: 00007f1ff0b24a4b RCX: 0000000000000002 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8e1bba80 RBP: 00007f1ff0b24a4b R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff905f5c17 R11: 00000000000a4001 R12: ffffffff817a8580 R13: ffffc90004887608 R14: 0000000000000000 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:337 [inline] rcu_read_lock include/linux/rcupdate.h:849 [inline] is_bpf_text_address+0x36/0x1a0 kernel/bpf/core.c:768 kernel_text_address kernel/extable.c:125 [inline] kernel_text_address+0x8d/0x100 kernel/extable.c:94 __kernel_text_address+0xd/0x40 kernel/extable.c:79 unwind_get_return_address+0x59/0xa0 arch/x86/kernel/unwind_orc.c:369 arch_stack_walk+0xa7/0x100 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4085 [inline] slab_alloc_node mm/slub.c:4134 [inline] kmem_cache_alloc_node_noprof+0x153/0x310 mm/slub.c:4186 __alloc_skb+0x2b1/0x380 net/core/skbuff.c:668 alloc_skb include/linux/skbuff.h:1323 [inline] netlink_alloc_large_skb+0x69/0x130 net/netlink/af_netlink.c:1196 netlink_sendmsg+0x689/0xd70 net/netlink/af_netlink.c:1866 sock_sendmsg_nosec net/socket.c:711 [inline] __sock_sendmsg net/socket.c:726 [inline] ____sys_sendmsg+0xaaf/0xc90 net/socket.c:2583 ___sys_sendmsg+0x135/0x1e0 net/socket.c:2637 __sys_sendmsg+0x16e/0x220 net/socket.c:2669 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1ff0b24a4b RSP: 002b:00007fffa5927628 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000055da1df62d90 RCX: 00007f1ff0b24a4b RDX: 0000000000000000 RSI: 00007fffa5927638 RDI: 0000000000000004 RBP: 000055da1df86220 R08: 0000000000000001 R09: 0000000000000000 R10: 000000000000010f R11: 0000000000000246 R12: 0000000000000000 R13: 00000000000000b3 R14: 0000000000000000 R15: 0000000000000000 task:kworker/u8:7 state:R running task stack:23184 pid:1091 tgid:1091 ppid:2 flags:0x00004000 Workqueue: bat_events batadv_nc_worker Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0xe58/0x5ad0 kernel/sched/core.c:6756 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7078 irqentry_exit+0x36/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:lock_acquire.part.0+0x155/0x380 kernel/locking/lockdep.c:5814 Code: b8 ff ff ff ff 65 0f c1 05 d0 16 97 7e 83 f8 01 0f 85 d0 01 00 00 9c 58 f6 c4 02 0f 85 e5 01 00 00 48 85 ed 0f 85 b6 01 00 00 <48> b8 00 00 00 00 00 fc ff df 48 01 c3 48 c7 03 00 00 00 00 48 c7 RSP: 0018:ffffc90003f57aa8 EFLAGS: 00000206 RAX: 0000000000000046 RBX: 1ffff920007eaf56 RCX: 000000004733ec69 RDX: 0000000000000001 RSI: ffffffff8b6ce1e0 RDI: ffffffff8bd0e980 RBP: 0000000000000200 R08: 0000000000000000 R09: fffffbfff2dc9398 R10: ffffffff96e49cc7 R11: 0000000000000002 R12: 0000000000000000 R13: ffffffff8e1bba80 R14: 0000000000000000 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:337 [inline] rcu_read_lock include/linux/rcupdate.h:849 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline] batadv_nc_worker+0x16a/0x1060 net/batman-adv/network-coding.c:719 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 rcu: rcu_preempt kthread starved for 10500 jiffies! g27501 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 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:28064 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0xe58/0x5ad0 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6848 schedule_timeout+0x124/0x280 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2045 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2247 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 8948 Comm: syz.7.514 Not tainted 6.12.0-syzkaller-09073-g9f16d5e6f220 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:arch_test_and_set_bit arch/x86/include/asm/bitops.h:137 [inline] RIP: 0010:test_and_set_bit include/asm-generic/bitops/instrumented-atomic.h:72 [inline] RIP: 0010:__netif_schedule+0x2d/0x2f0 net/core/dev.c:3139 Code: fa 41 55 41 54 55 53 48 89 fb e8 1e 7c 95 f8 48 8d bb 58 01 00 00 be 08 00 00 00 e8 7d 60 f8 f8 f0 48 0f ba ab 58 01 00 00 00 <40> 0f 92 c5 31 ff 89 ee e8 d6 7d 95 f8 40 84 ed 74 0b 5b 5d 41 5c RSP: 0000:ffffc90000007d58 EFLAGS: 00000047 RAX: 0000000000000001 RBX: ffff88807b613000 RCX: ffffffff88f93ec3 RDX: ffffed100f6c262c RSI: 0000000000000008 RDI: ffff88807b613158 RBP: ffff888053532400 R08: 0000000000000001 R09: ffffed100f6c262b R10: ffff88807b61315f R11: 0000000000000002 R12: 0000000000000000 R13: ffff888053532400 R14: ffff88807b613340 R15: ffff888030ce4400 FS: 0000555570910500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b33b0fff8 CR3: 0000000069eda000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: advance_sched+0x6a7/0xc60 net/sched/sch_taprio.c:986 __run_hrtimer kernel/time/hrtimer.c:1739 [inline] __hrtimer_run_queues+0x20a/0xae0 kernel/time/hrtimer.c:1803 hrtimer_interrupt+0x392/0x8e0 kernel/time/hrtimer.c:1865 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline] __sysvec_apic_timer_interrupt+0x10f/0x400 arch/x86/kernel/apic/apic.c:1055 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:preempt_schedule_irq+0x4c/0x90 kernel/sched/core.c:7078 Code: df 55 65 48 8b 2d e4 c7 dd 74 53 48 89 eb 48 c1 eb 03 48 01 c3 bf 01 00 00 00 e8 3f 1a 37 f6 e8 ea 58 70 f6 fb bf 01 00 00 00 0f 9d ff ff 9c 58 fa f6 c4 02 75 1e bf 01 00 00 00 e8 fd c7 36 RSP: 0000:ffffc9000b2bf858 EFLAGS: 00000206 RAX: 000000000000141d RBX: ffffed10057b3000 RCX: 1ffffffff2dd1c95 RDX: 0000000000000000 RSI: ffffffff8b6cdee0 RDI: 0000000000000001 RBP: ffff88802bd98000 R08: 0000000000000001 R09: fffffbfff2dc93ad R10: ffffffff96e49d6f R11: 0000000000000005 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 irqentry_exit+0x36/0x90 kernel/entry/common.c:354 asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:709 RIP: 0010:xas_load+0x22b/0x5b0 lib/xarray.c:246 Code: 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 34 03 00 00 4c 89 ea 44 88 65 12 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 04 02 <84> c0 74 06 0f 8e f7 02 00 00 45 0f b6 65 00 31 ff 44 89 e6 e8 4c RSP: 0000:ffffc9000b2bf928 EFLAGS: 00000a02 RAX: 0000000000000000 RBX: ffff88805b3de3c2 RCX: ffffffff8b17f4fc RDX: 1ffff11004cfc420 RSI: ffffffff8b17f507 RDI: ffffc9000b2bf9aa RBP: ffffc9000b2bf998 R08: 0000000000000007 R09: 0000000000000002 R10: 0000000000000002 R11: 0000000000000001 R12: 0000000000000017 R13: ffff8880267e2100 R14: 0000000000000002 R15: 0000000000000001 filemap_get_entry+0x10a/0x3c0 mm/filemap.c:1841 __filemap_get_folio+0x59/0xaf0 mm/filemap.c:1886 filemap_get_folio include/linux/pagemap.h:770 [inline] filemap_fault+0x208/0x2820 mm/filemap.c:3323 __do_fault+0x10a/0x490 mm/memory.c:4907 do_shared_fault mm/memory.c:5386 [inline] do_fault mm/memory.c:5460 [inline] do_pte_missing+0x1a8/0x3e70 mm/memory.c:3979 handle_pte_fault mm/memory.c:5801 [inline] __handle_mm_fault+0x103c/0x2a40 mm/memory.c:5944 handle_mm_fault+0x3fa/0xaa0 mm/memory.c:6112 do_user_addr_fault+0x60d/0x13f0 arch/x86/mm/fault.c:1338 handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0033:0x7f1fd125cd8a Code: 01 4c 89 44 24 10 4c 89 54 24 08 e8 20 b4 fe ff 48 8b 43 38 4c 8b 44 24 10 83 43 28 08 4c 8b 54 24 08 48 8d 48 f8 48 89 4b 38 <48> 89 68 f8 45 3b 78 04 0f 82 5e fe ff ff e9 ed fe ff ff 0f 1f 00 RSP: 002b:00007fff8bc3f7b0 EFLAGS: 00010202 RAX: 0000001b33b10000 RBX: 00007f1fd2065720 RCX: 0000001b33b0fff8 RDX: 0000001b33520218 RSI: 0000000000000008 RDI: 00007f1fd2065720 RBP: ffffffff817a9ed0 R08: 00007f1fd15361f8 R09: 00007f1fd1522000 R10: 00007f1fd01fb008 R11: 0000000000000013 R12: 0000000000000013 R13: 00000000000000c3 R14: ffffffff817a92d6 R15: 0000000000000106