[info] Using makefile-style concurrent boot in runlevel 2. [ 53.708871][ T27] audit: type=1800 audit(1578432778.500:21): pid=7758 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 53.736301][ T27] audit: type=1800 audit(1578432778.500:22): pid=7758 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2480 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] 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 '10.128.1.46' (ECDSA) to the list of known hosts. 2020/01/07 21:33:08 fuzzer started 2020/01/07 21:33:10 dialing manager at 10.128.0.105:46717 2020/01/07 21:33:10 syscalls: 2808 2020/01/07 21:33:10 code coverage: enabled 2020/01/07 21:33:10 comparison tracing: enabled 2020/01/07 21:33:10 extra coverage: enabled 2020/01/07 21:33:10 setuid sandbox: enabled 2020/01/07 21:33:10 namespace sandbox: enabled 2020/01/07 21:33:10 Android sandbox: /sys/fs/selinux/policy does not exist 2020/01/07 21:33:10 fault injection: enabled 2020/01/07 21:33:10 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/01/07 21:33:10 net packet injection: enabled 2020/01/07 21:33:10 net device setup: enabled 2020/01/07 21:33:10 concurrency sanitizer: enabled 2020/01/07 21:33:10 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/01/07 21:33:11 adding functions to KCSAN blacklist: 'ep_poll' '__hrtimer_run_queues' 'audit_log_start' 'copy_process' 'tomoyo_supervisor' '__ext4_new_inode' 'find_get_pages_range_tag' syzkaller login: [ 69.726790][ C0] ================================================================== [ 69.734933][ C0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_do_timer [ 69.743202][ C0] [ 69.745604][ C0] read to 0xffffffff85ebb050 of 4 bytes by task 0 on cpu 1: [ 69.752886][ C0] tick_nohz_next_event+0x19d/0x370 [ 69.758134][ C0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 69.763683][ C0] do_idle+0x1b8/0x290 [ 69.768036][ C0] cpu_startup_entry+0x1b/0x20 [ 69.772874][ C0] start_secondary+0x168/0x1b0 [ 69.777683][ C0] secondary_startup_64+0xa4/0xb0 [ 69.782724][ C0] [ 69.785081][ C0] write to 0xffffffff85ebb050 of 4 bytes by interrupt on cpu 0: [ 69.792933][ C0] tick_sched_do_timer+0xc0/0xe0 [ 69.797893][ C0] tick_sched_timer+0x43/0xe0 [ 69.802590][ C0] __hrtimer_run_queues+0x274/0x5f0 [ 69.807795][ C0] hrtimer_interrupt+0x22a/0x480 [ 69.814068][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 69.819725][ C0] apic_timer_interrupt+0xf/0x20 [ 69.824679][ C0] clear_page_erms+0x7/0x10 [ 69.829279][ C0] prep_new_page+0x5d/0x110 [ 69.833791][ C0] get_page_from_freelist+0x139a/0x1650 [ 69.839370][ C0] __alloc_pages_nodemask+0x15f/0x310 [ 69.845008][ C0] alloc_pages_vma+0x2a6/0x3a0 [ 69.849788][ C0] do_huge_pmd_wp_page+0x3b3/0x1a20 [ 69.854994][ C0] __handle_mm_fault+0x1cfd/0x2e00 [ 69.860089][ C0] handle_mm_fault+0x21b/0x530 [ 69.864858][ C0] __do_page_fault+0x456/0x8d0 [ 69.869637][ C0] do_page_fault+0x38/0x194 [ 69.874288][ C0] page_fault+0x34/0x40 [ 69.878901][ C0] [ 69.881234][ C0] Reported by Kernel Concurrency Sanitizer on: [ 69.887396][ C0] CPU: 0 PID: 7913 Comm: syz-fuzzer Not tainted 5.5.0-rc1-syzkaller #0 [ 69.895624][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.905755][ C0] ================================================================== [ 69.913811][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 69.920562][ C0] CPU: 0 PID: 7913 Comm: syz-fuzzer Not tainted 5.5.0-rc1-syzkaller #0 [ 69.928801][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.938845][ C0] Call Trace: [ 69.942154][ C0] [ 69.945053][ C0] dump_stack+0x11d/0x181 [ 69.949406][ C0] panic+0x210/0x640 [ 69.953302][ C0] ? vprintk_func+0x8d/0x140 [ 69.957943][ C0] kcsan_report.cold+0xc/0xd [ 69.962762][ C0] kcsan_setup_watchpoint+0x3fe/0x460 [ 69.968212][ C0] __tsan_unaligned_write4+0xc7/0x110 [ 69.973622][ C0] tick_sched_do_timer+0xc0/0xe0 [ 69.978668][ C0] tick_sched_timer+0x43/0xe0 [ 69.983355][ C0] __hrtimer_run_queues+0x274/0x5f0 [ 69.988601][ C0] ? tick_sched_handle+0x100/0x100 [ 69.993908][ C0] hrtimer_interrupt+0x22a/0x480 [ 69.998849][ C0] ? sched_clock+0x13/0x20 [ 70.003514][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 70.008975][ C0] apic_timer_interrupt+0xf/0x20 [ 70.013903][ C0] [ 70.016848][ C0] RIP: 0010:clear_page_erms+0x7/0x10 [ 70.022132][ C0] Code: 48 89 47 18 48 89 47 20 48 89 47 28 48 89 47 30 48 89 47 38 48 8d 7f 40 75 d9 90 c3 0f 1f 80 00 00 00 00 b9 00 10 00 00 31 c0 aa c3 cc cc cc cc cc cc 55 48 89 e5 41 57 41 56 41 55 41 54 53 [ 70.042454][ C0] RSP: 0000:ffffc900015d3a20 EFLAGS: 00010246 ORIG_RAX: ffffffffffffff13 [ 70.050871][ C0] RAX: 0000000000000000 RBX: ffffea0004668000 RCX: 0000000000001000 [ 70.059074][ C0] RDX: 0000000000000000 RSI: 0000000000000200 RDI: ffff888119a00000 [ 70.067059][ C0] RBP: ffffc900015d3a50 R08: 0000000000000000 R09: 0000ffff85c56410 [ 70.075124][ C0] R10: 0000ffff85ebba70 R11: 0000ffff85c56417 R12: ffff88812b0d7040 [ 70.083086][ C0] R13: ffff888000000000 R14: 0000160000000000 R15: ffffea0004670000 [ 70.091076][ C0] ? kernel_init_free_pages+0x68/0xb0 [ 70.096546][ C0] prep_new_page+0x5d/0x110 [ 70.101051][ C0] get_page_from_freelist+0x139a/0x1650 [ 70.107122][ C0] __alloc_pages_nodemask+0x15f/0x310 [ 70.112985][ C0] alloc_pages_vma+0x2a6/0x3a0 [ 70.118167][ C0] do_huge_pmd_wp_page+0x3b3/0x1a20 [ 70.123378][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 70.129379][ C0] __handle_mm_fault+0x1cfd/0x2e00 [ 70.134637][ C0] handle_mm_fault+0x21b/0x530 [ 70.139440][ C0] __do_page_fault+0x456/0x8d0 [ 70.145010][ C0] do_page_fault+0x38/0x194 [ 70.150293][ C0] page_fault+0x34/0x40 [ 70.154437][ C0] RIP: 0033:0x713aae [ 70.158334][ C0] Code: 89 cf e9 6b ff ff ff 48 8b 5c 24 78 48 8b 74 24 70 31 ff e9 a8 00 00 00 f3 41 0f 10 04 97 f3 0f 10 0d e2 0d 30 00 f3 0f 58 c1 41 0f 11 04 97 49 ff c5 48 8b 54 24 38 48 8b 74 24 70 4d 39 f5 [ 70.178830][ C0] RSP: 002b:000000c420051bb0 EFLAGS: 00010287 [ 70.185953][ C0] RAX: 0000000000000c7b RBX: 00000000000000fa RCX: 000000c42367c000 [ 70.194890][ C0] RDX: 000000000000074f RSI: 0000000000000c7b RDI: 0000000000000000 [ 70.203243][ C0] RBP: 000000c420051c08 R08: 000000c420239680 R09: 000000000000001d [ 70.213789][ C0] R10: 000000c420302d00 R11: 000000c420302d30 R12: 000000c4203076c0 [ 70.222706][ C0] R13: 0000000000000000 R14: 0000000000000017 R15: 000000c425a79500 [ 70.231938][ C0] Kernel Offset: disabled [ 70.236294][ C0] Rebooting in 86400 seconds..