loop1: rw=2049, want=196, limit=63 attempt to access beyond end of device loop1: rw=2049, want=197, limit=63 attempt to access beyond end of device loop1: rw=2049, want=213, limit=63 INFO: rcu_sched detected stalls on CPUs/tasks: (detected by 0, t=10502 jiffies, g=37727, c=37726, q=4) All QSes seen, last rcu_sched kthread activity 10498 (4295075517-4295065019), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.2 R running task 26656 551 304 0x00000008 Call Trace: <IRQ> sched_show_task kernel/sched/core.c:5168 [inline] sched_show_task.cold+0x2f0/0x351 kernel/sched/core.c:5143 print_other_cpu_stall kernel/rcu/tree.c:1501 [inline] check_cpu_stall kernel/rcu/tree.c:1616 [inline] __rcu_pending kernel/rcu/tree.c:3390 [inline] rcu_pending kernel/rcu/tree.c:3452 [inline] rcu_check_callbacks.cold+0xcb1/0xd0a kernel/rcu/tree.c:2792 update_process_times+0x31/0x70 kernel/time/timer.c:1590 tick_sched_handle+0x85/0x160 kernel/time/tick-sched.c:161 tick_sched_timer+0x43/0x130 kernel/time/tick-sched.c:1219 __run_hrtimer kernel/time/hrtimer.c:1223 [inline] __hrtimer_run_queues+0x270/0xbc0 kernel/time/hrtimer.c:1287 hrtimer_interrupt+0x1d8/0x5d0 kernel/time/hrtimer.c:1321 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1075 [inline] smp_apic_timer_interrupt+0x11c/0x5e0 arch/x86/kernel/apic/apic.c:1100 apic_timer_interrupt+0x96/0xa0 arch/x86/entry/entry_64.S:792 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline] RIP: 0010:kmem_cache_free+0xb0/0x2b0 mm/slab.c:3759 RSP: 0018:ffff8880aec07bc8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000007 RBX: ffff8880a84e9340 RCX: 1ffff1100ae6f133 RDX: 0000000000000000 RSI: ffff888057378978 RDI: 0000000000000282 RBP: ffff8880aec07be8 R08: 00000000b46e486d R09: ffff888057378998 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88821b7d0240 R13: 0000000000000282 R14: ffffffff851a1588 R15: dffffc0000000000 kfree_skbmem+0x88/0x110 net/core/skbuff.c:607 __kfree_skb+0x1e/0x30 net/core/skbuff.c:646 sk_wmem_free_skb include/net/sock.h:1421 [inline] tcp_write_queue_purge include/net/tcp.h:1631 [inline] tcp_write_err+0x2ad/0x640 net/ipv4/tcp_timer.c:39 tcp_fastopen_synack_timer net/ipv4/tcp_timer.c:384 [inline] tcp_retransmit_timer+0x351/0x25c0 net/ipv4/tcp_timer.c:421 tcp_write_timer_handler+0x479/0x7e0 net/ipv4/tcp_timer.c:583 tcp_write_timer+0xd6/0x180 net/ipv4/tcp_timer.c:601 call_timer_fn+0x161/0x670 kernel/time/timer.c:1279 expire_timers kernel/time/timer.c:1318 [inline] __run_timers kernel/time/timer.c:1636 [inline] __run_timers kernel/time/timer.c:1604 [inline] run_timer_softirq+0x5b7/0x1520 kernel/time/timer.c:1649 __do_softirq+0x244/0x9a0 kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x160/0x1b0 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:648 [inline] smp_apic_timer_interrupt+0x146/0x5e0 arch/x86/kernel/apic/apic.c:1102 apic_timer_interrupt+0x96/0xa0 arch/x86/entry/entry_64.S:792 </IRQ> RIP: 0010:preempt_schedule_irq+0xab/0x140 kernel/sched/core.c:3611 RSP: 0018:ffff88807c7ef5b8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff0fe2d2b RBX: dffffc0000000000 RCX: 1ffff1100ae6f129 RDX: 0000000000000000 RSI: ffff888057378928 RDI: ffff8880573788fc RBP: ffff88807c7ef5d8 R08: 0000012a95ecc03e R09: ffff888057378948 R10: 0000000000000000 R11: 0000000000000000 R12: ffffed100ae6f010 R13: ffff888057378080 R14: ffffffff87f16958 R15: 0000000000000000 retint_kernel+0x1b/0x2d RIP: 0010:sb_find_get_block include/linux/buffer_head.h:338 [inline] RIP: 0010:recently_deleted fs/ext4/ialloc.c:690 [inline] RIP: 0010:find_inode_bit.isra.0+0x1fb/0x4d0 fs/ext4/ialloc.c:730 RSP: 0018:ffff88807c7ef690 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10 RAX: ffff888079037738 RBX: dffffc0000000000 RCX: ffffc90009023000 RDX: 000000000001b7b8 RSI: ffffffff819bf7c7 RDI: ffff88808f7b1e28 RBP: ffff88807c7ef6f0 R08: ffff888057378080 R09: ffff888057378948 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888215fbccc0 R13: 00000000000000c0 R14: ffff88807c7ef830 R15: 0000000000000000 __ext4_new_inode+0x1285/0x4860 fs/ext4/ialloc.c:922 ext4_create+0x1da/0x4f0 fs/ext4/namei.c:2478 lookup_open+0x11a6/0x1860 fs/namei.c:3240 do_last fs/namei.c:3331 [inline] path_openat+0xfca/0x3f70 fs/namei.c:3566 do_filp_open+0x18e/0x250 fs/namei.c:3600 do_sys_open+0x2c5/0x430 fs/open.c:1084 SYSC_openat fs/open.c:1111 [inline] SyS_openat+0x30/0x40 fs/open.c:1105 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45af49 RSP: 002b:00007f98b71f1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045af49 RDX: 000000000000275a RSI: 0000000020000280 RDI: ffffffffffffff9c RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f98b71f26d4 R13: 00000000004c87eb R14: 00000000004e0970 R15: 00000000ffffffff INFO: rcu_preempt detected stalls on CPUs/tasks: 1-...: (1 GPs behind) idle=042/140000000000000/0 softirq=167533/167535 fqs=0 (detected by 0, t=10532 jiffies, g=45630, c=45629, q=586) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 31155 Comm: syz-executor.5 Not tainted 4.14.162-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880a14cc480 task.stack: ffff88805faf0000 RIP: 0010:debug_lockdep_rcu_enabled+0x26/0xa0 kernel/rcu/update.c:299 RSP: 0018:ffff88805faf7700 EFLAGS: 00000202 RAX: 0000000000000007 RBX: ffffea000256ea40 RCX: 1ffffffff1166301 RDX: 0000000000000000 RSI: ffffffff87049200 RDI: 0000000000000000 RBP: ffff88805faf7700 R08: 0000000000000000 R09: ffff8880a14ccd48 R10: ffff8880a14ccd28 R11: ffff8880a14cc480 R12: ffffea000256ea40 R13: ffffea000256ea60 R14: ffffea000256ea40 R15: dead000000000100 FS: 0000000000000000(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000c058a4 CR3: 0000000056add000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_read_unlock include/linux/rcupdate.h:681 [inline] __unlock_page_memcg+0x46/0x100 mm/memcontrol.c:1716 unlock_page_memcg+0x2c/0x40 mm/memcontrol.c:1725 page_remove_file_rmap mm/rmap.c:1245 [inline] page_remove_rmap+0x1c7/0x940 mm/rmap.c:1296 zap_pte_range mm/memory.c:1342 [inline] zap_pmd_range mm/memory.c:1444 [inline] zap_pud_range mm/memory.c:1473 [inline] zap_p4d_range mm/memory.c:1494 [inline] unmap_page_range+0xabd/0x19f0 mm/memory.c:1515 unmap_single_vma+0x15d/0x2c0 mm/memory.c:1560 unmap_vmas+0xac/0x170 mm/memory.c:1590 exit_mmap+0x285/0x4e0 mm/mmap.c:3062 __mmput kernel/fork.c:930 [inline] mmput+0x114/0x440 kernel/fork.c:951 exit_mm kernel/exit.c:545 [inline] do_exit+0x6fc/0x2c80 kernel/exit.c:841 do_group_exit+0x111/0x330 kernel/exit.c:951 get_signal+0x381/0x1cd0 kernel/signal.c:2413 do_signal+0x86/0x19a0 arch/x86/kernel/signal.c:814 exit_to_usermode_loop+0x15c/0x220 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x414d8a RSP: 002b:00007ffe42241b08 EFLAGS: 00000246 ORIG_RAX: 000000000000003d RAX: fffffffffffffe00 RBX: 00000000000079b4 RCX: 0000000000414d8a RDX: 0000000040000000 RSI: 00007ffe42241b14 RDI: ffffffffffffffff RBP: 00000000000000f8 R08: 00000000000079b3 R09: 000000000267b940 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000416a50 R13: 00007ffe42241d98 R14: 0000000000000000 R15: 0000000000000000 Code: 00 00 00 00 00 48 c7 c0 0c 18 b3 88 55 48 ba 00 00 00 00 00 fc ff df 48 89 c1 83 e0 07 48 89 e5 48 c1 e9 03 83 c0 03 0f b6 14 11 <38> d0 7c 04 84 d2 75 49 8b 15 38 96 65 07 85 d2 74 3b 48 c7 c0 rcu_preempt kthread starved for 10532 jiffies! g45630 c45629 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0 rcu_preempt R running task 29776 8 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x7b8/0x1cd0 kernel/sched/core.c:3384 schedule+0x92/0x1c0 kernel/sched/core.c:3428 schedule_timeout+0x43e/0xe10 kernel/time/timer.c:1746 rcu_gp_kthread+0xbf4/0x1ec0 kernel/rcu/tree.c:2255 kthread+0x319/0x430 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404