rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (1 GPs behind) idle=c1f4/1/0x4000000000000000 softirq=11516/11520 fqs=62 rcu: (detected by 1, t=10502 jiffies, g=16181, q=742 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 6679 Comm: modprobe Not tainted 6.11.0-rc4-syzkaller-00274-g780bdc1ba776 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:__kasan_check_read+0x0/0x20 mm/kasan/shadow.c:30 Code: 8e 4c 89 fe e8 31 f8 b8 09 31 db eb d0 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 89 f6 48 8b 0c 24 31 d2 e9 6f e6 ff ff 66 2e 0f 1f 84 RSP: 0018:ffffc90000007a68 EFLAGS: 00000013 RAX: 0000000000000001 RBX: 0000000000000068 RCX: 0000000000040000 RDX: 0000000000080000 RSI: 0000000000000008 RDI: ffffffff93734848 RBP: 0000000000000014 R08: 0000000000000068 R09: ffff88805899c6e0 R10: dffffc0000000000 R11: fffffbfff202fe8e R12: ffff88805899bc00 R13: 0000000000000068 R14: 00000000000c4068 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000563d822b5008 CR3: 0000000024d80000 CR4: 0000000000350ef0 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:227 [inline] check_wait_context kernel/locking/lockdep.c:4772 [inline] __lock_acquire+0x4d4/0x2040 kernel/locking/lockdep.c:5092 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline] _raw_spin_lock_irq+0xd3/0x120 kernel/locking/spinlock.c:170 __run_hrtimer kernel/time/hrtimer.c:1693 [inline] __hrtimer_run_queues+0x670/0xd50 kernel/time/hrtimer.c:1753 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1815 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline] __sysvec_apic_timer_interrupt+0x112/0x3f0 arch/x86/kernel/apic/apic.c:1049 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:lock_acquire+0x264/0x550 kernel/locking/lockdep.c:5763 Code: 2b 00 74 08 4c 89 f7 e8 0a 00 8b 00 f6 44 24 61 02 0f 85 85 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25 RSP: 0018:ffffc90003f36ce0 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 1ffff920007e6da8 RCX: 90691b0b06019700 RDX: dffffc0000000000 RSI: ffffffff8c0ae6e0 RDI: ffffffff8c606d80 RBP: ffffc90003f36e38 R08: ffffffff937348e7 R09: 1ffffffff26e691c R10: dffffc0000000000 R11: fffffbfff26e691d R12: 1ffff920007e6da4 R13: dffffc0000000000 R14: ffffc90003f36d40 R15: 0000000000000246 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] __find_get_block_slow fs/buffer.c:207 [inline] __find_get_block+0x2b1/0x1150 fs/buffer.c:1408 bdev_getblk+0x33/0x550 fs/buffer.c:1435 __getblk include/linux/buffer_head.h:381 [inline] sb_getblk include/linux/buffer_head.h:387 [inline] __ext4_get_inode_loc+0x53a/0xee0 fs/ext4/inode.c:4441 ext4_get_inode_loc fs/ext4/inode.c:4569 [inline] ext4_reserve_inode_write+0x182/0x360 fs/ext4/inode.c:5800 __ext4_mark_inode_dirty+0x1ec/0x880 fs/ext4/inode.c:5977 ext4_dirty_inode+0xce/0x110 fs/ext4/inode.c:6014 __mark_inode_dirty+0x327/0xe20 fs/fs-writeback.c:2486 generic_update_time fs/inode.c:2004 [inline] inode_update_time fs/inode.c:2017 [inline] touch_atime+0x413/0x690 fs/inode.c:2089 file_accessed include/linux/fs.h:2485 [inline] ext4_file_mmap+0x192/0x550 fs/ext4/file.c:797 call_mmap include/linux/fs.h:2129 [inline] mmap_region+0xe91/0x2090 mm/mmap.c:2957 do_mmap+0x8f9/0x1010 mm/mmap.c:1468 vm_mmap_pgoff+0x1dd/0x3d0 mm/util.c:588 elf_map fs/binfmt_elf.c:385 [inline] elf_load+0x25d/0x6f0 fs/binfmt_elf.c:408 load_elf_interp+0x443/0xac0 fs/binfmt_elf.c:675 load_elf_binary+0x1a47/0x2680 fs/binfmt_elf.c:1235 search_binary_handler fs/exec.c:1827 [inline] exec_binprm fs/exec.c:1869 [inline] bprm_execve+0xafa/0x1770 fs/exec.c:1920 kernel_execve+0x931/0xa50 fs/exec.c:2087 call_usermodehelper_exec_async+0x237/0x380 kernel/umh.c:110 ret_from_fork+0x4d/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 10377 jiffies! g16181 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:26576 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0x1800/0x4a60 kernel/sched/core.c:6529 __schedule_loop kernel/sched/core.c:6606 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6621 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2034 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2236 kthread+0x2f2/0x390 kernel/kthread.c:389 ret_from_fork+0x4d/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: CPU: 1 UID: 0 PID: 6698 Comm: syz.4.498 Not tainted 6.11.0-rc4-syzkaller-00274-g780bdc1ba776 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:csd_lock_wait kernel/smp.c:312 [inline] RIP: 0010:smp_call_function_many_cond+0x1865/0x29d0 kernel/smp.c:856 Code: 89 e6 83 e6 01 31 ff e8 39 18 0c 00 41 83 e4 01 49 bc 00 00 00 00 00 fc ff df 75 07 e8 e4 13 0c 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 c8 13 0c 00 eb e4 44 RSP: 0018:ffffc90004967400 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 1ffff11017248c59 RCX: 0000000000040000 RDX: ffffc9000a5ef000 RSI: 000000000003ffff RDI: 0000000000040000 RBP: ffffc900049675e0 R08: ffffffff81877a17 R09: 1ffffffff26e6908 R10: dffffc0000000000 R11: fffffbfff26e6909 R12: dffffc0000000000 R13: ffff8880b92462c8 R14: ffff8880b933fb40 R15: 0000000000000000 FS: 00007f67c2b776c0(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b32719ff8 CR3: 000000002c4b0000 CR4: 0000000000350ef0 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1023 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:2085 [inline] text_poke_bp_batch+0x352/0xb30 arch/x86/kernel/alternative.c:2295 text_poke_bp+0xb0/0x100 arch/x86/kernel/alternative.c:2522 __static_call_transform+0x51a/0x810 arch/x86/kernel/static_call.c:111 arch_static_call_transform+0x141/0x380 arch/x86/kernel/static_call.c:163 __static_call_update+0xd8/0x5e0 kernel/static_call_inline.c:147 tracepoint_update_call kernel/tracepoint.c:317 [inline] tracepoint_add_func+0x918/0x9e0 kernel/tracepoint.c:358 tracepoint_probe_register_prio_may_exist+0x122/0x190 kernel/tracepoint.c:482 bpf_raw_tp_link_attach+0x48b/0x6e0 kernel/bpf/syscall.c:3896 bpf_raw_tracepoint_open+0x1c2/0x240 kernel/bpf/syscall.c:3927 __sys_bpf+0x3c0/0x810 kernel/bpf/syscall.c:5752 __do_sys_bpf kernel/bpf/syscall.c:5817 [inline] __se_sys_bpf kernel/bpf/syscall.c:5815 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5815 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f67c1d79e79 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f67c2b77038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f67c1f15f80 RCX: 00007f67c1d79e79 RDX: 0000000000000010 RSI: 0000000020000080 RDI: 0000000000000011 RBP: 00007f67c1de793e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f67c1f15f80 R15: 00007ffda383fea8