audit: type=1804 audit(1555082859.632:93): pid=26137 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir770443220/syzkaller.vnfIW8/454/bus" dev="sda1" ino=18172 res=1 INFO: rcu_preempt self-detected stall on CPU 1-...: (1 GPs behind) idle=dae/140000000000001/0 softirq=97728/97732 fqs=1 (t=10500 jiffies g=32128 c=32127 q=171) rcu_preempt kthread starved for 10496 jiffies! g32128 c32127 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:2807 [inline] __schedule+0x7be/0x1cf0 kernel/sched/core.c:3383 schedule+0x92/0x1c0 kernel/sched/core.c:3427 schedule_timeout+0x43e/0xe10 kernel/time/timer.c:1744 rcu_gp_kthread+0xbf4/0x1ec0 kernel/rcu/tree.c:2255 kthread+0x31c/0x430 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402 NMI backtrace for cpu 1 CPU: 1 PID: 26128 Comm: syz-executor.4 Not tainted 4.14.111 #1 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x138/0x19c lib/dump_stack.c:53 nmi_cpu_backtrace.cold+0x57/0x94 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x141/0x189 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_single_cpu_backtrace include/linux/nmi.h:158 [inline] rcu_dump_cpu_stacks+0x186/0x1d2 kernel/rcu/tree.c:1396 print_cpu_stall kernel/rcu/tree.c:1542 [inline] check_cpu_stall kernel/rcu/tree.c:1610 [inline] __rcu_pending kernel/rcu/tree.c:3390 [inline] rcu_pending kernel/rcu/tree.c:3452 [inline] rcu_check_callbacks.cold+0x43d/0xd0a kernel/rcu/tree.c:2792 update_process_times+0x31/0x70 kernel/time/timer.c:1588 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:1220 [inline] __hrtimer_run_queues+0x273/0xbd0 kernel/time/hrtimer.c:1284 hrtimer_interrupt+0x1d8/0x5d0 kernel/time/hrtimer.c:1318 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1037 [inline] smp_apic_timer_interrupt+0x12c/0x600 arch/x86/kernel/apic/apic.c:1062 apic_timer_interrupt+0x8e/0xa0 arch/x86/entry/entry_64.S:787 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:778 [inline] RIP: 0010:lock_acquire+0x1ea/0x430 kernel/locking/lockdep.c:3997 RSP: 0018:ffff88809974f2a8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff0ee2965 RBX: ffff88806dbbe5c0 RCX: 000000001ffc7b3a RDX: dffffc0000000000 RSI: ffff88806dbbee90 RDI: 0000000000000282 RBP: ffff88809974f2f0 R08: 0000000000000000 R09: ffff88806dbbeeb0 R10: ffff88806dbbee90 R11: ffff88806dbbe5c0 R12: ffffffff8778ed60 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000002 rcu_lock_acquire include/linux/rcupdate.h:244 [inline] rcu_read_lock include/linux/rcupdate.h:631 [inline] avc_has_perm_noaudit+0xca/0x420 security/selinux/avc.c:1106 cred_has_capability+0x12e/0x290 security/selinux/hooks.c:1745 selinux_capable+0x36/0x40 security/selinux/hooks.c:2225 security_capable+0x88/0xc0 security/security.c:279 ns_capable_common+0x73/0x160 kernel/capability.c:375 ns_capable kernel/capability.c:397 [inline] capable+0x22/0x30 kernel/capability.c:431 should_remove_suid+0xa6/0xe0 fs/inode.c:1767 dentry_needs_remove_privs.part.0+0x18/0x60 fs/inode.c:1788 dentry_needs_remove_privs fs/inode.c:1833 [inline] file_remove_privs+0x1f6/0x430 fs/inode.c:1824 __generic_file_write_iter+0x15e/0x5b0 mm/filemap.c:3095 ext4_file_write_iter+0x2c0/0xfd0 fs/ext4/file.c:264 call_write_iter include/linux/fs.h:1774 [inline] do_iter_readv_writev+0x41e/0x680 fs/read_write.c:674 do_iter_write fs/read_write.c:953 [inline] do_iter_write+0x154/0x550 fs/read_write.c:934 vfs_iter_write+0x77/0xb0 fs/read_write.c:966 iter_file_splice_write+0x578/0xae0 fs/splice.c:749 do_splice_from fs/splice.c:851 [inline] direct_splice_actor+0x126/0x1a0 fs/splice.c:1018 splice_direct_to_actor+0x2a1/0x7b0 fs/splice.c:973 do_splice_direct+0x18d/0x230 fs/splice.c:1061 do_sendfile+0x4db/0xbd0 fs/read_write.c:1440 SYSC_sendfile64 fs/read_write.c:1501 [inline] SyS_sendfile64+0x102/0x110 fs/read_write.c:1487 do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x458c29 RSP: 002b:00007fc820c65c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000458c29 RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000005 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 00008000fffffffe R11: 0000000000000246 R12: 00007fc820c666d4 R13: 00000000004c5c9c R14: 00000000004da240 R15: 00000000ffffffff INFO: rcu_sched detected stalls on CPUs/tasks: 1-...: (1 GPs behind) idle=dae/140000000000000/0 softirq=97727/97732 fqs=1 (detected by 0, t=10555 jiffies, g=17001, c=17000, q=3) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 26128 Comm: syz-executor.4 Not tainted 4.14.111 #1 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff88806dbbe5c0 task.stack: ffff888099748000 RIP: 0010:__sanitizer_cov_trace_pc+0x51/0x60 kernel/kcov.c:93 RSP: 0018:ffff88809974f248 EFLAGS: 00000246 RAX: 0000000000040000 RBX: 0000000000000002 RCX: ffffc90009a53000 RDX: 0000000000040000 RSI: ffffffff81c24948 RDI: 0000000000000282 RBP: ffff88809974f248 R08: ffff888077ee5348 R09: 0000000000000002 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff888215cfe400 R14: ffff888017d2c064 R15: ffff8880943858b0 FS: 00007fc820c66700(0000) GS:ffff8880aef00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2dd33000 CR3: 000000005df03000 CR4: 00000000001406e0 Call Trace: brelse include/linux/buffer_head.h:295 [inline] ext4_do_update_inode fs/ext4/inode.c:5179 [inline] ext4_mark_iloc_dirty+0x16d8/0x2900 fs/ext4/inode.c:5691 ext4_mark_inode_dirty+0x1f0/0x870 fs/ext4/inode.c:5870 ext4_dirty_inode+0x73/0xa0 fs/ext4/inode.c:5901 __mark_inode_dirty+0x550/0x1040 fs/fs-writeback.c:2130 mark_inode_dirty include/linux/fs.h:2016 [inline] generic_write_end+0x1b7/0x290 fs/buffer.c:2218 ext4_da_write_end+0x347/0x8f0 fs/ext4/inode.c:3181 generic_perform_write+0x2a2/0x490 mm/filemap.c:3035 __generic_file_write_iter+0x239/0x5b0 mm/filemap.c:3149 ext4_file_write_iter+0x2c0/0xfd0 fs/ext4/file.c:264 call_write_iter include/linux/fs.h:1774 [inline] do_iter_readv_writev+0x41e/0x680 fs/read_write.c:674 do_iter_write fs/read_write.c:953 [inline] do_iter_write+0x154/0x550 fs/read_write.c:934 vfs_iter_write+0x77/0xb0 fs/read_write.c:966 iter_file_splice_write+0x578/0xae0 fs/splice.c:749 do_splice_from fs/splice.c:851 [inline] direct_splice_actor+0x126/0x1a0 fs/splice.c:1018 splice_direct_to_actor+0x2a1/0x7b0 fs/splice.c:973 do_splice_direct+0x18d/0x230 fs/splice.c:1061 do_sendfile+0x4db/0xbd0 fs/read_write.c:1440 SYSC_sendfile64 fs/read_write.c:1501 [inline] SyS_sendfile64+0x102/0x110 fs/read_write.c:1487 do_syscall_64+0x1eb/0x630 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x458c29 RSP: 002b:00007fc820c65c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000458c29 RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000005 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 00008000fffffffe R11: 0000000000000246 R12: 00007fc820c666d4 R13: 00000000004c5c9c R14: 00000000004da240 R15: 00000000ffffffff Code: 74 01 c3 55 48 89 e5 48 8b 75 08 48 8b 88 d0 12 00 00 8b 80 cc 12 00 00 48 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 <5d> c3 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 57 rcu_sched kthread starved for 10552 jiffies! g17001 c17000 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0 rcu_sched R running task 29776 9 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2807 [inline] __schedule+0x7be/0x1cf0 kernel/sched/core.c:3383 schedule+0x92/0x1c0 kernel/sched/core.c:3427 schedule_timeout+0x43e/0xe10 kernel/time/timer.c:1744 rcu_gp_kthread+0xbf4/0x1ec0 kernel/rcu/tree.c:2255 kthread+0x31c/0x430 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402