[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.200' (ECDSA) to the list of known hosts. 2020/06/18 13:11:13 fuzzer started 2020/06/18 13:11:14 dialing manager at 10.128.0.105:34299 2020/06/18 13:11:14 syscalls: 3089 2020/06/18 13:11:14 code coverage: enabled 2020/06/18 13:11:14 comparison tracing: enabled 2020/06/18 13:11:14 extra coverage: enabled 2020/06/18 13:11:14 setuid sandbox: enabled 2020/06/18 13:11:14 namespace sandbox: enabled 2020/06/18 13:11:14 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/18 13:11:14 fault injection: enabled 2020/06/18 13:11:14 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/18 13:11:14 net packet injection: enabled 2020/06/18 13:11:14 net device setup: enabled 2020/06/18 13:11:14 concurrency sanitizer: enabled 2020/06/18 13:11:14 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/18 13:11:14 USB emulation: enabled syzkaller login: [ 50.307623][ T8919] KCSAN: could not find function: '_find_next_bit' 2020/06/18 13:11:15 suppressing KCSAN reports in functions: 'ep_poll' 'find_get_pages_range_tag' 'ktime_get_real_seconds' 'blk_mq_get_request' '__ext4_new_inode' 'run_timer_softirq' '__filemap_fdatawrite_range' 'mod_timer' 'ext4_mark_iloc_dirty' 'generic_fillattr' 'ext4_free_inodes_count' '_find_next_bit' 'tick_nohz_next_event' 'generic_write_end' [ 56.981140][ C1] ================================================================== [ 56.989245][ C1] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 56.997363][ C1] [ 56.999686][ C1] write to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 0: [ 57.007307][ C1] tick_sched_do_timer+0xb4/0xd0 [ 57.012238][ C1] tick_sched_timer+0x3f/0xd0 [ 57.016904][ C1] __hrtimer_run_queues+0x271/0x600 [ 57.022090][ C1] hrtimer_interrupt+0x226/0x490 [ 57.027019][ C1] smp_apic_timer_interrupt+0xd8/0x270 [ 57.032469][ C1] apic_timer_interrupt+0xf/0x20 [ 57.037400][ C1] __tsan_unaligned_write2+0xa/0x110 [ 57.042675][ C1] virtqueue_add+0xa51/0x1ab0 [ 57.047342][ C1] virtqueue_add_inbuf_ctx+0x4c/0x64 [ 57.052621][ C1] try_fill_recv+0x69a/0xe60 [ 57.057194][ C1] virtnet_poll+0x62d/0x790 [ 57.061677][ C1] net_rx_action+0x3ad/0xac0 [ 57.066251][ C1] __do_softirq+0x118/0x34a [ 57.070745][ C1] run_ksoftirqd+0x41/0x60 [ 57.075146][ C1] smpboot_thread_fn+0x374/0x4a0 [ 57.080076][ C1] kthread+0x203/0x230 [ 57.084127][ C1] ret_from_fork+0x1f/0x30 [ 57.088511][ C1] [ 57.090831][ C1] read to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 1: [ 57.098396][ C1] tick_sched_do_timer+0x2e/0xd0 [ 57.103432][ C1] tick_sched_timer+0x3f/0xd0 [ 57.108207][ C1] __hrtimer_run_queues+0x271/0x600 [ 57.113398][ C1] hrtimer_interrupt+0x226/0x490 [ 57.118307][ C1] smp_apic_timer_interrupt+0xd8/0x270 [ 57.123739][ C1] apic_timer_interrupt+0xf/0x20 [ 57.128640][ C1] [ 57.130938][ C1] Reported by Kernel Concurrency Sanitizer on: [ 57.137063][ C1] CPU: 1 PID: 8906 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 57.145268][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.155311][ C1] ================================================================== [ 57.163365][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 57.169939][ C1] CPU: 1 PID: 8906 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 57.178155][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.188188][ C1] Call Trace: [ 57.191444][ C1] [ 57.194275][ C1] dump_stack+0x11d/0x187 [ 57.198580][ C1] panic+0x210/0x640 [ 57.202453][ C1] ? vprintk_func+0x89/0x13a [ 57.207016][ C1] kcsan_report.cold+0xc/0x1a [ 57.211674][ C1] kcsan_setup_watchpoint+0x3fb/0x440 [ 57.217023][ C1] tick_sched_do_timer+0x2e/0xd0 [ 57.221947][ C1] tick_sched_timer+0x3f/0xd0 [ 57.226597][ C1] __hrtimer_run_queues+0x271/0x600 [ 57.231783][ C1] ? tick_sched_do_timer+0xd0/0xd0 [ 57.236868][ C1] hrtimer_interrupt+0x226/0x490 [ 57.241782][ C1] ? kvm_clock_read+0x14/0x30 [ 57.246438][ C1] smp_apic_timer_interrupt+0xd8/0x270 [ 57.251888][ C1] apic_timer_interrupt+0xf/0x20 [ 57.256793][ C1] [ 57.259705][ C1] RIP: 0033:0x6684aa [ 57.263577][ C1] Code: 8b 0d b2 3e 06 01 48 8b 15 a3 3e 06 01 eb a8 48 8b 4c 24 40 48 8b 54 24 28 eb 9c 44 89 c0 41 81 e0 ff 01 00 00 42 8b 5c 82 08 <41> 89 d8 83 e3 0f 48 83 fb 09 0f 86 02 01 00 00 48 8b 8a 10 08 00 [ 57.283153][ C1] RSP: 002b:000000c000303a90 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 [ 57.291664][ C1] RAX: 00000000000cce74 RBX: 0000000000000fc2 RCX: 000000000000000c [ 57.299620][ C1] RDX: 000000c00036a028 RSI: 000000c00036a000 RDI: 0000000000000014 [ 57.307565][ C1] RBP: 000000c000303ad8 R08: 0000000000000074 R09: 00000000000000a6 [ 57.315510][ C1] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000004c51 [ 57.323453][ C1] R13: 0000000000000100 R14: 0000000000000002 R15: 0000000000000002 [ 57.332630][ C1] Kernel Offset: disabled [ 57.336958][ C1] Rebooting in 86400 seconds..