sched: RT throttling activated rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5275/1:b..l P5210/1:b..l rcu: (detected by 0, t=10503 jiffies, g=5073, q=232 ncpus=2) task:kworker/u4:6 state:R running task stack:26360 pid:5210 ppid:2 flags:0x00004000 Workqueue: bat_events batadv_nc_worker Call Trace: context_switch kernel/sched/core.c:5307 [inline] __schedule+0xc91/0x5770 kernel/sched/core.c:6625 preempt_schedule_irq+0x52/0x90 kernel/sched/core.c:6937 irqentry_exit+0x35/0x80 kernel/entry/common.c:433 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:lock_acquire+0x1f3/0x520 kernel/locking/lockdep.c:5637 Code: db 9d 7e 83 f8 01 0f 85 b9 02 00 00 9c 58 f6 c4 02 0f 85 a4 02 00 00 48 83 7c 24 08 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24 RSP: 0018:ffffc90004e9fb98 EFLAGS: 00000206 RAX: dffffc0000000000 RBX: 1ffff920009d3f75 RCX: 542198fc625fbfc9 RDX: 1ffff1100423ac3e RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff914dcb87 R10: fffffbfff229b970 R11: 0000000000000000 R12: 0000000000000002 R13: 0000000000000000 R14: ffffffff8c7955c0 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:327 [inline] rcu_read_lock include/linux/rcupdate.h:773 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline] batadv_nc_worker+0x131/0xfe0 net/batman-adv/network-coding.c:719 process_one_work+0x991/0x15c0 kernel/workqueue.c:2390 worker_thread+0x669/0x1090 kernel/workqueue.c:2537 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 task:syz-executor.4 state:R running task stack:24640 pid:5275 ppid:5150 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5307 [inline] __schedule+0xc91/0x5770 kernel/sched/core.c:6625 preempt_schedule_irq+0x52/0x90 kernel/sched/core.c:6937 irqentry_exit+0x35/0x80 kernel/entry/common.c:433 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:lock_is_held_type+0x103/0x140 kernel/locking/lockdep.c:5717 Code: 00 00 b8 ff ff ff ff 65 0f c1 05 d8 81 00 76 83 f8 01 75 29 9c 58 f6 c4 02 75 3d 48 f7 04 24 00 02 00 00 74 01 fb 48 83 c4 08 <44> 89 e8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 45 31 ed eb b9 0f 0b 48 RSP: 0018:ffffc9000531f2c0 EFLAGS: 00000296 RAX: 0000000000000046 RBX: 0000000000000003 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff888073f404f8 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000094001 R12: ffff88807e4457c0 R13: 0000000000000000 R14: 00000000ffffffff R15: ffff88807e446248 lock_is_held include/linux/lockdep.h:283 [inline] xa_entry include/linux/xarray.h:1198 [inline] xas_descend+0x29b/0x480 lib/xarray.c:204 xas_load+0xe9/0x140 lib/xarray.c:242 mapping_get_entry mm/filemap.c:1858 [inline] __filemap_get_folio+0x152/0xdc0 mm/filemap.c:1920 pagecache_get_page+0x2e/0x280 mm/folio-compat.c:99 ext4_da_write_begin+0x3f7/0xa10 fs/ext4/inode.c:3073 generic_perform_write+0x256/0x570 mm/filemap.c:3926 ext4_buffered_write_iter+0x15b/0x460 fs/ext4/file.c:289 ext4_file_write_iter+0xbe0/0x1740 fs/ext4/file.c:710 call_write_iter include/linux/fs.h:1851 [inline] do_iter_readv_writev+0x20b/0x3b0 fs/read_write.c:735 do_iter_write+0x182/0x700 fs/read_write.c:861 vfs_iter_write+0x74/0xa0 fs/read_write.c:902 iter_file_splice_write+0x743/0xc80 fs/splice.c:778 do_splice_from fs/splice.c:856 [inline] direct_splice_actor+0x114/0x180 fs/splice.c:1022 splice_direct_to_actor+0x335/0x8a0 fs/splice.c:977 do_splice_direct+0x1ab/0x280 fs/splice.c:1065 do_sendfile+0xb19/0x12c0 fs/read_write.c:1255 __do_sys_sendfile64 fs/read_write.c:1317 [inline] __se_sys_sendfile64 fs/read_write.c:1309 [inline] __x64_sys_sendfile64+0x14d/0x210 fs/read_write.c:1309 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x45f679 RSP: 002b:00007fbe9c0131a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 000000000052bf00 RCX: 000000000045f679 RDX: 0000000020000000 RSI: 0000000000000003 RDI: 0000000000000003 RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000 R10: 00008080fffffffe R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004f0998 R14: 00000000004b0443 R15: 00007fbe9c0136bc rcu: rcu_preempt kthread starved for 10568 jiffies! g5073 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:28680 pid:16 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5307 [inline] __schedule+0xc91/0x5770 kernel/sched/core.c:6625 schedule+0xde/0x1a0 kernel/sched/core.c:6701 schedule_timeout+0x14e/0x2b0 kernel/time/timer.c:2167 rcu_gp_fqs_loop+0x190/0x910 kernel/rcu/tree.c:1608 rcu_gp_kthread+0x23a/0x360 kernel/rcu/tree.c:1807 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 5279 Comm: syz-executor.0 Not tainted 6.3.0-rc4-syzkaller-00039-gffe78bbd5121 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 RIP: 0010:mark_lock.part.0+0x158/0x1970 kernel/locking/lockdep.c:4594 Code: 70 50 0f 84 f6 06 00 00 41 ba 01 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 <48> c7 43 14 00 00 00 00 48 8b 84 24 30 01 00 00 65 48 2b 04 25 28 RSP: 0018:ffffc900001e0ac0 EFLAGS: 00000086 RAX: dffffc0000000000 RBX: fffff5200003c15f RCX: 1ffffffff229c136 RDX: dffffc0000000000 RSI: 0000000000000200 RDI: ffffffff914e09b0 RBP: 0000000000000200 R08: 0000000000000000 R09: ffffffff914dcb8f R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880247fa818 R13: 0000000000000009 R14: 000000000000004d R15: ffff8880247fa838 FS: 00007fcc49f81700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000049bcb0 CR3: 0000000079356000 CR4: 0000000000350ee0 Call Trace: mark_lock kernel/locking/lockdep.c:4599 [inline] mark_usage kernel/locking/lockdep.c:4556 [inline] __lock_acquire+0x8a8/0x5d40 kernel/locking/lockdep.c:5010 lock_acquire kernel/locking/lockdep.c:5669 [inline] lock_acquire+0x1af/0x520 kernel/locking/lockdep.c:5634 seqcount_lockdep_reader_access include/linux/seqlock.h:102 [inline] timekeeping_get_delta kernel/time/timekeeping.c:254 [inline] timekeeping_get_ns kernel/time/timekeeping.c:388 [inline] ktime_get+0x14b/0x470 kernel/time/timekeeping.c:848 clockevents_program_event+0x145/0x370 kernel/time/clockevents.c:326 tick_program_event+0xb0/0x140 kernel/time/tick-oneshot.c:44 hrtimer_interrupt+0x372/0x7b0 kernel/time/hrtimer.c:1824 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1096 [inline] __sysvec_apic_timer_interrupt+0x14a/0x430 arch/x86/kernel/apic/apic.c:1113 sysvec_apic_timer_interrupt+0x92/0xc0 arch/x86/kernel/apic/apic.c:1107 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:check_kcov_mode kernel/kcov.c:173 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0xb/0x70 kernel/kcov.c:207 Code: 0f 1e fa 48 8b be a8 01 00 00 e8 b0 ff ff ff 31 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 f3 0f 1e fa 65 8b 05 2d e0 80 7e <89> c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b 14 25 80 b8 03 00 a9 RSP: 0018:ffffc9000533f200 EFLAGS: 00000293 RAX: 0000000080000001 RBX: ffff88806996742c RCX: ffffffff822887d7 RDX: ffff8880247f9d40 RSI: 0000000000000000 RDI: 0000000000000005 RBP: ffff888073f40cb8 R08: 0000000000000005 R09: 000000000000000f R10: 0000000000000001 R11: 0000000000000000 R12: ffff888069967400 R13: ffff888073f40a0c R14: 0000000000000001 R15: dffffc0000000000 ext4_fill_raw_inode+0xdd9/0x1e90 fs/ext4/inode.c:4494 ext4_do_update_inode fs/ext4/inode.c:5248 [inline] ext4_mark_iloc_dirty+0x52c/0x1b70 fs/ext4/inode.c:5880 __ext4_mark_inode_dirty+0x21f/0x800 fs/ext4/inode.c:6084 ext4_dirty_inode+0xdd/0x130 fs/ext4/inode.c:6113 __mark_inode_dirty+0x1e0/0xd60 fs/fs-writeback.c:2421 mark_inode_dirty include/linux/fs.h:2127 [inline] generic_write_end+0x354/0x440 fs/buffer.c:2227 ext4_da_write_end+0x172/0x8e0 fs/ext4/inode.c:3174 generic_perform_write+0x316/0x570 mm/filemap.c:3937 ext4_buffered_write_iter+0x15b/0x460 fs/ext4/file.c:289 ext4_file_write_iter+0xbe0/0x1740 fs/ext4/file.c:710 call_write_iter include/linux/fs.h:1851 [inline] do_iter_readv_writev+0x20b/0x3b0 fs/read_write.c:735 do_iter_write+0x182/0x700 fs/read_write.c:861 vfs_iter_write+0x74/0xa0 fs/read_write.c:902 iter_file_splice_write+0x743/0xc80 fs/splice.c:778 do_splice_from fs/splice.c:856 [inline] direct_splice_actor+0x114/0x180 fs/splice.c:1022 splice_direct_to_actor+0x335/0x8a0 fs/splice.c:977 do_splice_direct+0x1ab/0x280 fs/splice.c:1065 do_sendfile+0xb19/0x12c0 fs/read_write.c:1255 __do_sys_sendfile64 fs/read_write.c:1317 [inline] __se_sys_sendfile64 fs/read_write.c:1309 [inline] __x64_sys_sendfile64+0x14d/0x210 fs/read_write.c:1309 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x45f679 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fcc49f811a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 000000000052bfa0 RCX: 000000000045f679 RDX: 0000000020000000 RSI: 0000000000000003 RDI: 0000000000000003 RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000 R10: 00008080fffffffe R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004f0998 R14: 00000000004b0443 R15: 00007fcc49f816bc INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.539 msecs