rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (0 ticks this GP) idle=1444/1/0x4000000000000000 softirq=61322/61322 fqs=0 rcu: (detected by 1, t=10502 jiffies, g=98829, q=257 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 15203 Comm: syz-executor.2 Not tainted 6.9.0-rc3-next-20240408-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 RIP: 0010:check_kcov_mode kernel/kcov.c:173 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x18/0x70 kernel/kcov.c:207 Code: 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 65 48 8b 0c 25 40 d3 03 00 65 8b 15 a0 e5 6d 7e c2 00 01 ff 00 74 11 f7 c2 00 01 00 00 74 35 83 b9 1c 16 00 00 RSP: 0018:ffffc90000007c28 EFLAGS: 00000086 RAX: ffffffff898e3a86 RBX: ffff8880596102c0 RCX: ffff888051463c00 RDX: 0000000000010002 RSI: ffff88802ae25c00 RDI: ffff8880596102c0 RBP: dffffc0000000000 R08: ffffffff898e3333 R09: fffff52000000f80 R10: dffffc0000000000 R11: fffff52000000f80 R12: dffffc0000000000 R13: ffff88802449f808 R14: ffff88802449f800 R15: ffff88802ae25c00 FS: 0000555561eed480(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb96ffa8000 CR3: 00000000206d8000 CR4: 00000000003506f0 Call Trace: taprio_set_budgets+0x26/0x370 net/sched/sch_taprio.c:659 advance_sched+0x98d/0xca0 net/sched/sch_taprio.c:977 __run_hrtimer kernel/time/hrtimer.c:1692 [inline] __hrtimer_run_queues+0x5a5/0xd50 kernel/time/hrtimer.c:1756 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1818 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline] __sysvec_apic_timer_interrupt+0x110/0x3f0 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:__orc_find arch/x86/kernel/unwind_orc.c:100 [inline] RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:227 [inline] RIP: 0010:unwind_next_frame+0x4c9/0x2a00 arch/x86/kernel/unwind_orc.c:494 Code: cd 18 55 00 48 c7 c3 5c 27 b9 8f 49 bd 00 00 00 00 00 fc ff df e9 96 01 00 00 49 89 df 48 89 5c 24 28 49 89 dd 4c 8b 74 24 38 <4c> 89 e0 4c 29 e8 48 89 c1 48 c1 f9 02 48 c1 e8 3f 48 01 c8 48 83 RSP: 0018:ffffc9001047f4c8 EFLAGS: 00000293 RAX: ffffffff8140d551 RBX: ffffffff8fc41534 RCX: ffff888051463c00 RDX: 0000000000000000 RSI: ffffffff81ef3b54 RDI: ffffffff81ef3bc1 RBP: ffffffff81ef3bc1 R08: ffffffff8140d530 R09: ffffc9001047f690 R10: 0000000000000003 R11: ffffffff8181cd50 R12: ffffffff8fc41530 R13: ffffffff8fc41524 R14: ffffffff81ef3b54 R15: ffffffff8fc41524 arch_stack_walk+0x151/0x1b0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:312 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3897 [inline] slab_alloc_node mm/slub.c:3957 [inline] kmem_cache_alloc_noprof+0x135/0x290 mm/slub.c:3964 jbd2_alloc_handle include/linux/jbd2.h:1591 [inline] new_handle fs/jbd2/transaction.c:476 [inline] jbd2__journal_start+0x17c/0x620 fs/jbd2/transaction.c:503 __ext4_journal_start_sb+0x239/0x600 fs/ext4/ext4_jbd2.c:112 __ext4_new_inode+0x12dc/0x4390 fs/ext4/ialloc.c:1078 ext4_mkdir+0x425/0xcf0 fs/ext4/namei.c:3013 vfs_mkdir+0x2f9/0x4f0 fs/namei.c:4123 do_mkdirat+0x264/0x3a0 fs/namei.c:4146 __do_sys_mkdirat fs/namei.c:4161 [inline] __se_sys_mkdirat fs/namei.c:4159 [inline] __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4159 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x72/0x7a RIP: 0033:0x7f312887c967 Code: 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 02 01 00 00 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:00007fff837b0e58 EFLAGS: 00000202 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007fff837b0ee0 RCX: 00007f312887c967 RDX: 00000000000001ff RSI: 00007fff837b0ee0 RDI: 00000000ffffff9c RBP: 00007fff837b0ebc R08: 0000000000000005 R09: 00007fff837b0bf5 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000032 R13: 000000000009be3c R14: 000000000009bde1 R15: 0000000000000003 rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g98829 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=0 timer-softirq=38524 rcu: rcu_preempt kthread starved for 10502 jiffies! g98829 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:26320 pid:16 tgid:16 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5409 [inline] __schedule+0x17e8/0x4a50 kernel/sched/core.c:6746 __schedule_loop kernel/sched/core.c:6823 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6838 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2582 rcu_gp_fqs_loop+0x2df/0x1370 kernel/rcu/tree.c:1683 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:1882 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243