[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 61.231854][ T26] audit: type=1800 audit(1561870685.420:25): pid=9020 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 61.267973][ T26] audit: type=1800 audit(1561870685.420:26): pid=9020 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 61.310070][ T26] audit: type=1800 audit(1561870685.430:27): pid=9020 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.219' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 414.399977][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 414.406680][ C1] rcu: 1-....: (11288 ticks this GP) idle=6ca/1/0x4000000000000002 softirq=10244/10246 fqs=5246 [ 414.417409][ C1] (t=10500 jiffies g=8025 q=53) [ 414.422336][ C1] NMI backtrace for cpu 1 [ 414.427067][ C1] CPU: 1 PID: 9173 Comm: syz-executor062 Not tainted 5.2.0-rc6-next-20190628 #25 [ 414.436172][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 414.446220][ C1] Call Trace: [ 414.449495][ C1] [ 414.452401][ C1] dump_stack+0x172/0x1f0 [ 414.456750][ C1] nmi_cpu_backtrace.cold+0x70/0xb2 [ 414.461935][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 414.468167][ C1] ? lapic_can_unplug_cpu.cold+0x45/0x45 [ 414.473789][ C1] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 414.479768][ C1] arch_trigger_cpumask_backtrace+0x14/0x20 [ 414.485664][ C1] rcu_dump_cpu_stacks+0x183/0x1cf [ 414.490814][ C1] ? find_next_bit+0x107/0x130 [ 414.495570][ C1] rcu_sched_clock_irq.cold+0x4dd/0xc13 [ 414.501115][ C1] ? raise_softirq+0x138/0x340 [ 414.505878][ C1] update_process_times+0x32/0x80 [ 414.510903][ C1] tick_sched_handle+0xa2/0x190 [ 414.515754][ C1] tick_sched_timer+0x53/0x140 [ 414.520508][ C1] __hrtimer_run_queues+0x364/0xe40 [ 414.525695][ C1] ? tick_sched_do_timer+0x1b0/0x1b0 [ 414.531005][ C1] ? hrtimer_start_range_ns+0xcb0/0xcb0 [ 414.536539][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 414.542246][ C1] ? ktime_get_update_offsets_now+0x2d3/0x440 [ 414.548305][ C1] hrtimer_interrupt+0x314/0x770 [ 414.553285][ C1] smp_apic_timer_interrupt+0x160/0x610 [ 414.558834][ C1] apic_timer_interrupt+0xf/0x20 [ 414.563749][ C1] [ 414.566674][ C1] RIP: 0010:__sanitizer_cov_trace_pc+0x1/0x50 [ 414.572722][ C1] Code: 25 e4 a4 16 09 41 bc f4 ff ff ff e8 ad a6 e9 ff 48 c7 05 ce a4 16 09 00 00 00 00 e9 77 e9 ff ff 90 90 90 90 90 90 90 90 90 55 <48> 89 e5 65 48 8b 04 25 c0 fd 01 00 65 8b 15 34 a0 8f 7e 81 e2 00 [ 414.592307][ C1] RSP: 0018:ffff88809b707108 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 414.600724][ C1] RAX: 0000000000000000 RBX: 00000000000000a0 RCX: ffffffff81f83b80 [ 414.608688][ C1] RDX: 0000000000000000 RSI: ffffffff81f844ed RDI: ffff88812c27629c [ 414.616641][ C1] RBP: ffff88809b707210 R08: ffff88808bd4e280 R09: ffffed101132275a [ 414.624596][ C1] R10: ffffed1011322759 R11: ffff888089913acf R12: 0000000000000000 [ 414.632559][ C1] R13: 0000000000000000 R14: ffff8880899138f0 R15: ffff88812c276200 [ 414.640542][ C1] ? ext4_mark_iloc_dirty+0x1940/0x2de0 [ 414.646619][ C1] ? ext4_mark_iloc_dirty+0x22ad/0x2de0 [ 414.652161][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 414.658378][ C1] ? ext4_mark_iloc_dirty+0x1951/0x2de0 [ 414.663908][ C1] ? ext4_chunk_trans_blocks+0x30/0x30 [ 414.669343][ C1] ? __ext4_journal_get_write_access+0x70/0xa0 [ 414.675491][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 414.681716][ C1] ? ext4_reserve_inode_write+0x11c/0x240 [ 414.687415][ C1] ext4_mark_inode_dirty+0x255/0x9b0 [ 414.692695][ C1] ? ext4_dirty_inode+0x8f/0xc0 [ 414.697620][ C1] ? ext4_expand_extra_isize+0x590/0x590 [ 414.703318][ C1] ? ___might_sleep+0x163/0x280 [ 414.708152][ C1] ? __might_sleep+0x95/0x190 [ 414.712829][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 414.719056][ C1] ? ext4_journal_check_start+0x1ba/0x250 [ 414.724760][ C1] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 414.730982][ C1] ? __ext4_journal_start_sb+0x146/0x4d0 [ 414.736597][ C1] ext4_dirty_inode+0x8f/0xc0 [ 414.741272][ C1] ? ext4_setattr+0x1f80/0x1f80 [ 414.746103][ C1] __mark_inode_dirty+0x68e/0x1390 [ 414.751193][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 414.757413][ C1] __generic_write_end+0xad/0x130 [ 414.762421][ C1] generic_write_end+0x74/0x1a0 [ 414.767256][ C1] ext4_da_write_end+0x205/0xa50 [ 414.772208][ C1] generic_perform_write+0x2fe/0x530 [ 414.777502][ C1] ? trace_event_raw_event_file_check_and_advance_wb_err+0x4b0/0x4b0 [ 414.786277][ C1] ? current_time+0x140/0x140 [ 414.790961][ C1] ? generic_write_check_limits.isra.0+0x270/0x270 [ 414.797462][ C1] ? ext4_file_write_iter+0x287/0x1430 [ 414.802908][ C1] __generic_file_write_iter+0x25e/0x630 [ 414.808520][ C1] ext4_file_write_iter+0x373/0x1430 [ 414.813790][ C1] ? ext4_release_file+0x380/0x380 [ 414.818885][ C1] ? kasan_check_read+0x11/0x20 [ 414.823722][ C1] ? __lock_acquire+0x1700/0x4c20 [ 414.828726][ C1] ? kasan_check_read+0x11/0x20 [ 414.833555][ C1] ? mark_lock+0xc0/0x11e0 [ 414.837951][ C1] do_iter_readv_writev+0x5f8/0x8f0 [ 414.843130][ C1] ? no_seek_end_llseek_size+0x70/0x70 [ 414.848598][ C1] ? apparmor_file_permission+0x25/0x30 [ 414.854131][ C1] ? rw_verify_area+0x126/0x360 [ 414.859001][ C1] do_iter_write+0x184/0x610 [ 414.863700][ C1] ? rcu_read_lock_sched_held+0x110/0x130 [ 414.869412][ C1] ? __kmalloc+0x605/0x770 [ 414.873837][ C1] vfs_iter_write+0x77/0xb0 [ 414.878325][ C1] iter_file_splice_write+0x66d/0xbe0 [ 414.883673][ C1] ? atime_needs_update+0x5f0/0x5f0 [ 414.888860][ C1] ? page_cache_pipe_buf_release+0x180/0x180 [ 414.894833][ C1] ? rw_verify_area+0x126/0x360 [ 414.899663][ C1] ? page_cache_pipe_buf_release+0x180/0x180 [ 414.905637][ C1] direct_splice_actor+0x123/0x190 [ 414.910750][ C1] splice_direct_to_actor+0x366/0x970 [ 414.916119][ C1] ? generic_pipe_buf_nosteal+0x10/0x10 [ 414.921652][ C1] ? do_splice_to+0x180/0x180 [ 414.926317][ C1] ? rw_verify_area+0x126/0x360 [ 414.931164][ C1] do_splice_direct+0x1da/0x2a0 [ 414.936006][ C1] ? splice_direct_to_actor+0x970/0x970 [ 414.941544][ C1] ? rcu_read_lock_sched_held+0x110/0x130 [ 414.947242][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 414.953476][ C1] ? __sb_start_write+0x1e5/0x4e0 [ 414.958486][ C1] do_sendfile+0x597/0xd00 [ 414.962892][ C1] ? do_compat_pwritev64+0x1c0/0x1c0 [ 414.968162][ C1] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 414.974382][ C1] ? _copy_from_user+0x12c/0x1a0 [ 414.979311][ C1] __x64_sys_sendfile64+0x15a/0x220 [ 414.984497][ C1] ? __ia32_sys_sendfile+0x230/0x230 [ 414.989778][ C1] ? do_syscall_64+0x26/0x6a0 [ 414.994452][ C1] ? lockdep_hardirqs_on+0x418/0x5d0 [ 414.999719][ C1] ? trace_hardirqs_on+0x67/0x240 [ 415.004812][ C1] do_syscall_64+0xfd/0x6a0 [ 415.009321][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 415.015192][ C1] RIP: 0033:0x440229 [ 415.019067][ C1] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 415.038656][ C1] RSP: 002b:00007fffd60d2308 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 [ 415.047069][ C1] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440229 [ 415.055042][ C1] RDX: 0000000020000000 RSI: 0000000000000003 RDI: 0000000000000003 [ 415.063002][ C1] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 415.070957][ C1] R10: 00008080fffffffe R11: 0000000000000246 R12: 0000000000401ab0 [ 415.078928][ C1] R13: 0000000000401b40 R14: 0000000000000000 R15: 0000000000000000