rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (1 ticks this GP) idle=c5d/1/0x4000000000000000 softirq=240026/240026 fqs=0 (detected by 0, t=10502 jiffies, g=469529, q=757) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 10293 Comm: syz-executor.1 Not tainted 5.15.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:memory_is_nonzero mm/kasan/generic.c:101 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline] RIP: 0010:kasan_check_range+0x5f/0x180 mm/kasan/generic.c:189 Code: 89 fd 48 b8 00 00 00 00 00 fc ff df 4d 89 ca 48 c1 ed 03 49 c1 ea 03 48 01 c5 49 01 c2 48 89 e8 49 8d 5a 01 48 89 da 48 29 ea <48> 83 fa 10 7e 63 41 89 eb 41 83 e3 07 75 74 4c 8d 5a 07 48 85 d2 RSP: 0018:ffffc90000fd8b80 EFLAGS: 00000002 RAX: fffffbfff1f9ff24 RBX: fffffbfff1f9ff25 RCX: ffffffff815a3c32 RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffffff8fcff920 RBP: fffffbfff1f9ff24 R08: 0000000000000000 R09: ffffffff8fcff927 R10: fffffbfff1f9ff24 R11: 0000000000000000 R12: ffff88803eb76ba0 R13: ffff88803eb76180 R14: 0000000000000001 R15: 07b81204c4a70325 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b32926000 CR3: 000000007228c000 CR4: 00000000001506e0 Call Trace: instrument_atomic_read include/linux/instrumented.h:71 [inline] test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline] hlock_class kernel/locking/lockdep.c:199 [inline] __lock_acquire+0xbc2/0x54a0 kernel/locking/lockdep.c:5012 lock_acquire kernel/locking/lockdep.c:5625 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5590 rcu_lock_acquire include/linux/rcupdate.h:267 [inline] rcu_read_lock include/linux/rcupdate.h:687 [inline] advance_sched+0x4a5/0x9a0 net/sched/sch_taprio.c:763 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:__sanitizer_cov_trace_pc+0x5c/0x60 kernel/kcov.c:207 Code: 82 18 15 00 00 83 f8 02 75 20 48 8b 8a 20 15 00 00 8b 92 1c 15 00 00 48 8b 01 48 83 c0 01 48 39 c2 76 07 48 89 34 c1 48 89 01 0f 1f 00 41 55 41 54 49 89 fc 55 48 bd eb 83 b5 80 46 86 c8 61 RSP: 0018:ffffc900032379f8 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000 RDX: ffff88803eb76180 RSI: ffffffff81aa8824 RDI: 0000000000000003 RBP: ffffea0000fa5880 R08: 000000000003e962 R09: 0000000000000001 R10: ffffffff81aa87ec R11: 0000000000000000 R12: ffffc90003237cf0 R13: 0000000000000007 R14: dffffc0000000000 R15: 00007fc802621000 __tlb_adjust_range include/asm-generic/tlb.h:311 [inline] tlb_flush_pte_range include/asm-generic/tlb.h:523 [inline] zap_pte_range mm/memory.c:1348 [inline] zap_pmd_range mm/memory.c:1481 [inline] zap_pud_range mm/memory.c:1510 [inline] zap_p4d_range mm/memory.c:1531 [inline] unmap_page_range+0xbb4/0x2a10 mm/memory.c:1552 unmap_single_vma+0x198/0x310 mm/memory.c:1597 unmap_vmas+0x16d/0x2f0 mm/memory.c:1629 exit_mmap+0x1d0/0x630 mm/mmap.c:3171 __mmput+0x122/0x4b0 kernel/fork.c:1115 mmput+0x58/0x60 kernel/fork.c:1136 exit_mm kernel/exit.c:501 [inline] do_exit+0xabc/0x2a30 kernel/exit.c:812 do_group_exit+0x125/0x310 kernel/exit.c:922 __do_sys_exit_group kernel/exit.c:933 [inline] __se_sys_exit_group kernel/exit.c:931 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:931 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fc8046a0739 Code: Unable to access opcode bytes at RIP 0x7fc8046a070f. RSP: 002b:00007fff09094dd8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 000000000000001e RCX: 00007fc8046a0739 RDX: 00007fc80465354b RSI: ffffffffffffffbc RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000001b2f933ef0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000000 R15: 00007fff09094ed0 rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g469529 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=1 timer-softirq=262503 rcu: rcu_preempt kthread starved for 10502 jiffies! g469529 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:28520 pid: 14 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0x940/0x26f0 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881 rcu_gp_fqs_loop+0x186/0x800 kernel/rcu/tree.c:1957 rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2130 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 0 to CPUs 1: ---------------- Code disassembly (best guess): 0: 89 fd mov %edi,%ebp 2: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 9: fc ff df c: 4d 89 ca mov %r9,%r10 f: 48 c1 ed 03 shr $0x3,%rbp 13: 49 c1 ea 03 shr $0x3,%r10 17: 48 01 c5 add %rax,%rbp 1a: 49 01 c2 add %rax,%r10 1d: 48 89 e8 mov %rbp,%rax 20: 49 8d 5a 01 lea 0x1(%r10),%rbx 24: 48 89 da mov %rbx,%rdx 27: 48 29 ea sub %rbp,%rdx * 2a: 48 83 fa 10 cmp $0x10,%rdx <-- trapping instruction 2e: 7e 63 jle 0x93 30: 41 89 eb mov %ebp,%r11d 33: 41 83 e3 07 and $0x7,%r11d 37: 75 74 jne 0xad 39: 4c 8d 5a 07 lea 0x7(%rdx),%r11 3d: 48 85 d2 test %rdx,%rdx