audit: type=1400 audit(1592062617.653:8): avc: denied { execmem } for pid=6352 comm="syz-executor934" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 hrtimer: interrupt took 42564 ns hrtimer: interrupt took 40505 ns INFO: rcu_sched detected stalls on CPUs/tasks: INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 0, t=10502 jiffies, g=329, c=328, q=0) (detected by 1, t=10502 jiffies, g=1103, c=1102, q=2) All QSes seen, last rcu_sched kthread activity 10502 (4294978725-4294968223), jiffies_till_next_fqs=1, root ->qsmask 0x0 All QSes seen, last rcu_preempt kthread activity 10502 (4294978725-4294968223), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor934 R syz-executor934 R running task running task 26848 6364 6353 0x00000000 26528 6362 6357 0x00000000 Call Trace: Call Trace: sched_show_task kernel/sched/core.c:5168 [inline] sched_show_task.cold+0x335/0x399 kernel/sched/core.c:5143 sched_show_task kernel/sched/core.c:5168 [inline] sched_show_task.cold+0x335/0x399 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+0xd3f/0xdaa kernel/rcu/tree.c:2792 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+0xd3f/0xdaa kernel/rcu/tree.c:2792 update_process_times+0x29/0x60 kernel/time/timer.c:1590 update_process_times+0x29/0x60 kernel/time/timer.c:1590 tick_sched_handle.isra.0+0x73/0x150 kernel/time/tick-sched.c:165 tick_sched_handle.isra.0+0x73/0x150 kernel/time/tick-sched.c:165 tick_sched_timer+0x41/0x120 kernel/time/tick-sched.c:1223 tick_sched_timer+0x41/0x120 kernel/time/tick-sched.c:1223 __run_hrtimer kernel/time/hrtimer.c:1223 [inline] __hrtimer_run_queues+0x24b/0xb90 kernel/time/hrtimer.c:1287 __run_hrtimer kernel/time/hrtimer.c:1223 [inline] __hrtimer_run_queues+0x24b/0xb90 kernel/time/hrtimer.c:1287 hrtimer_interrupt+0x1e6/0x5e0 kernel/time/hrtimer.c:1321 hrtimer_interrupt+0x1e6/0x5e0 kernel/time/hrtimer.c:1321 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1075 [inline] smp_apic_timer_interrupt+0x117/0x5f0 arch/x86/kernel/apic/apic.c:1100 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1075 [inline] smp_apic_timer_interrupt+0x117/0x5f0 arch/x86/kernel/apic/apic.c:1100 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline] RIP: 0010:lock_release+0x41e/0x7f0 kernel/locking/lockdep.c:4020 RIP: 0010:find_get_entry+0x2eb/0x660 mm/filemap.c:1386 RSP: 0018:ffff8880a9eb7870 EFLAGS: 00000282 RSP: 0018:ffff88809b16f4c8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff0f62cd1 RBX: 1ffff110153d6f12 RCX: 1ffff11010c2252f RAX: 1ffff11012beaeeb RBX: ffffea0001fdcf80 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000002 RDI: 0000000000000282 RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000282 RBP: ffffea0001fdcf80 R08: 0000000000000000 R09: 0000000000020012 RBP: ffff888086112100 R08: 0000000000000001 R09: 0000000000000001 R10: ffff888097e26958 R11: ffff888097e26080 R12: ffff888095f57758 R10: ffff8880861129b0 R11: ffff888086112100 R12: ffffffff816d515b R13: dffffc0000000000 R14: ffffea0001fdcfa0 R15: ffffea0001fdcf80 R13: 0000000000000003 R14: ffff888086112100 R15: 0000000000000002 pagecache_get_page+0x44/0xa10 mm/filemap.c:1465 grab_cache_page_write_begin+0x63/0x90 mm/filemap.c:2997 ext4_da_write_begin+0x244/0xe50 fs/ext4/inode.c:3074 rcu_lock_release include/linux/rcupdate.h:247 [inline] rcu_read_unlock include/linux/rcupdate.h:685 [inline] find_get_entry+0x342/0x660 mm/filemap.c:1392 pagecache_get_page+0x44/0xa10 mm/filemap.c:1465 generic_perform_write+0x1c9/0x420 mm/filemap.c:3047 find_get_page include/linux/pagemap.h:276 [inline] generic_file_buffered_read mm/filemap.c:1999 [inline] generic_file_read_iter+0x564/0x21d0 mm/filemap.c:2273 ext4_file_read_iter+0x14b/0x330 fs/ext4/file.c:76 call_read_iter include/linux/fs.h:1772 [inline] generic_file_splice_read+0x374/0x5d0 fs/splice.c:307 __generic_file_write_iter+0x227/0x590 mm/filemap.c:3172 ext4_file_write_iter+0x279/0xd90 fs/ext4/file.c:270 call_write_iter include/linux/fs.h:1778 [inline] do_iter_readv_writev+0x3df/0x600 fs/read_write.c:675 do_splice_to+0xfb/0x150 fs/splice.c:880 do_iter_write fs/read_write.c:954 [inline] do_iter_write+0x152/0x550 fs/read_write.c:935 vfs_iter_write+0x70/0xa0 fs/read_write.c:967 splice_direct_to_actor+0x20a/0x730 fs/splice.c:952 iter_file_splice_write+0x52e/0xa10 fs/splice.c:749 do_splice_direct+0x164/0x210 fs/splice.c:1061 do_sendfile+0x469/0xaf0 fs/read_write.c:1441 do_splice_from fs/splice.c:851 [inline] direct_splice_actor+0x115/0x160 fs/splice.c:1018 splice_direct_to_actor+0x27e/0x730 fs/splice.c:973 SYSC_sendfile64 fs/read_write.c:1496 [inline] SyS_sendfile64+0x9b/0x110 fs/read_write.c:1488 do_splice_direct+0x164/0x210 fs/splice.c:1061 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x4418a9 RSP: 002b:00007ffe99a10118 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 do_sendfile+0x469/0xaf0 fs/read_write.c:1441 RAX: ffffffffffffffda RBX: 00007ffe99a102c0 RCX: 00000000004418a9 RDX: 00000000200001c0 RSI: 0000000000000003 RDI: 0000000000000003 SYSC_sendfile64 fs/read_write.c:1496 [inline] SyS_sendfile64+0x9b/0x110 fs/read_write.c:1488 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 00008080fffffffe R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000402580 R14: 0000000000000000 R15: 0000000000000000 rcu_sched kthread starved for 10502 jiffies! g329 c328 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=1 rcu_sched R do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 running task entry_SYSCALL_64_after_hwframe+0x46/0xbb 29904 9 2 0x80000000 RIP: 0033:0x4418a9 Call Trace: RSP: 002b:00007ffe99a10118 EFLAGS: 00000246 context_switch kernel/sched/core.c:2808 [inline] __schedule+0x8a6/0x1d70 kernel/sched/core.c:3384 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007ffe99a102c0 RCX: 00000000004418a9 RDX: 00000000200001c0 RSI: 0000000000000003 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 R10: 00008080fffffffe R11: 0000000000000246 R12: 0000000000000000 schedule_timeout+0x4df/0xe50 kernel/time/timer.c:1746 R13: 0000000000402580 R14: 0000000000000000 R15: 0000000000000000 rcu_preempt kthread starved for 10502 jiffies! g1103 c1102 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=1 rcu_preempt R running task 29904 8 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x8a6/0x1d70 kernel/sched/core.c:3384 rcu_gp_kthread+0xb3d/0x1ce0 kernel/rcu/tree.c:2255 kthread+0x30d/0x420 kernel/kthread.c:232 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_timeout+0x4df/0xe50 kernel/time/timer.c:1746 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 rcu_gp_kthread+0xb3d/0x1ce0 kernel/rcu/tree.c:2255 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404