[ 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 syzkaller login: [ 23.187022][ T8287] sshd (8287) used greatest stack depth: 10008 bytes left Warning: Permanently added '10.128.10.9' (ECDSA) to the list of known hosts. 2021/01/16 08:12:01 fuzzer started 2021/01/16 08:12:01 dialing manager at 10.128.0.105:39871 2021/01/16 08:12:01 syscalls: 3465 2021/01/16 08:12:01 code coverage: enabled 2021/01/16 08:12:01 comparison tracing: enabled 2021/01/16 08:12:01 extra coverage: enabled 2021/01/16 08:12:01 setuid sandbox: enabled 2021/01/16 08:12:01 namespace sandbox: enabled 2021/01/16 08:12:01 Android sandbox: /sys/fs/selinux/policy does not exist 2021/01/16 08:12:01 fault injection: enabled 2021/01/16 08:12:01 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2021/01/16 08:12:01 net packet injection: enabled 2021/01/16 08:12:01 net device setup: enabled 2021/01/16 08:12:01 concurrency sanitizer: enabled 2021/01/16 08:12:01 devlink PCI setup: PCI device 0000:00:10.0 is not available 2021/01/16 08:12:01 USB emulation: enabled 2021/01/16 08:12:01 hci packet injection: enabled 2021/01/16 08:12:01 wifi device emulation: enabled 2021/01/16 08:12:04 suppressing KCSAN reports in functions: 'alloc_pid' 'kvm_mmu_notifier_invalidate_range_end' 'ext4_free_inode' '__io_cqring_fill_event' 'generic_file_buffered_read' '__mark_inode_dirty' 'expire_timers' '__add_to_page_cache_locked' 'do_nanosleep' '__xa_clear_mark' 'pcpu_alloc' 'n_tty_receive_buf_common' '__ext4_new_inode' 'blk_mq_sched_dispatch_requests' 'do_sys_poll' '_prb_read_valid' 'blk_mq_dispatch_rq_list' 'generic_write_end' 'exit_mm' 'compaction_alloc' 'ext4_ext_insert_extent' 'futex_wait_queue_me' 'audit_log_start' 'xas_clear_mark' 'ext4_writepages' 'do_select' 'vfs_fsync_range' 'find_get_pages_range_tag' 'wbt_issue' 'dd_has_work' 'blk_mq_rq_ctx_init' 'ext4_free_inodes_count' 'shmem_add_to_page_cache' 'shmem_mknod' 'ext4_ext_try_to_merge_right' 2021/01/16 08:12:04 fetching corpus: 0, signal 0/2000 (executing program) 2021/01/16 08:12:04 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corpus: 6579, signal 303917/414297 (executing program) 2021/01/16 08:12:14 fetching corpus: 6629, signal 305172/415782 (executing program) 2021/01/16 08:12:14 fetching corpus: 6679, signal 306172/417109 (executing program) 2021/01/16 08:12:14 fetching corpus: 6729, signal 307092/418309 (executing program) [ 43.359891][ C0] ================================================================== [ 43.368001][ C0] BUG: KCSAN: data-race in tick_sched_timer / tick_sched_timer [ 43.375552][ C0] [ 43.377992][ C0] write to 0xffffffff86fc2460 of 4 bytes by interrupt on cpu 1: [ 43.385631][ C0] tick_sched_timer+0x1e7/0x200 [ 43.390486][ C0] __run_hrtimer+0x133/0x420 [ 43.395076][ C0] hrtimer_interrupt+0x36e/0xa10 [ 43.400004][ C0] __sysvec_apic_timer_interrupt+0x6f/0x200 [ 43.405911][ C0] sysvec_apic_timer_interrupt+0x6f/0x90 [ 43.411545][ C0] asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 43.417532][ C0] [ 43.419843][ C0] read to 0xffffffff86fc2460 of 4 bytes by interrupt on cpu 0: [ 43.427376][ C0] tick_sched_timer+0x35/0x200 [ 43.432272][ C0] __run_hrtimer+0x133/0x420 [ 43.436879][ C0] hrtimer_interrupt+0x36e/0xa10 [ 43.441812][ C0] __sysvec_apic_timer_interrupt+0x6f/0x200 [ 43.447720][ C0] sysvec_apic_timer_interrupt+0x6f/0x90 [ 43.453349][ C0] asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 43.459339][ C0] [ 43.461655][ C0] Reported by Kernel Concurrency Sanitizer on: [ 43.467804][ C0] CPU: 0 PID: 8429 Comm: syz-fuzzer Not tainted 5.11.0-rc3-syzkaller #0 [ 43.476138][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.486366][ C0] ================================================================== [ 43.494456][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 43.501030][ C0] CPU: 0 PID: 8429 Comm: syz-fuzzer Not tainted 5.11.0-rc3-syzkaller #0 [ 43.509353][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.519422][ C0] Call Trace: [ 43.522710][ C0] dump_stack+0x116/0x15d [ 43.527050][ C0] panic+0x1e7/0x5fa [ 43.531060][ C0] ? vprintk_emit+0x2e2/0x360 [ 43.535736][ C0] kcsan_report+0x67b/0x680 [ 43.540239][ C0] ? kcsan_setup_watchpoint+0x47b/0x4e0 [ 43.545898][ C0] ? tick_sched_timer+0x35/0x200 [ 43.550843][ C0] ? __run_hrtimer+0x133/0x420 [ 43.555603][ C0] ? hrtimer_interrupt+0x36e/0xa10 [ 43.560721][ C0] ? __sysvec_apic_timer_interrupt+0x6f/0x200 [ 43.566803][ C0] ? sysvec_apic_timer_interrupt+0x6f/0x90 [ 43.572624][ C0] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 43.578811][ C0] kcsan_setup_watchpoint+0x47b/0x4e0 [ 43.584197][ C0] tick_sched_timer+0x35/0x200 [ 43.588978][ C0] ? tick_setup_sched_timer+0x240/0x240 [ 43.594531][ C0] __run_hrtimer+0x133/0x420 [ 43.599121][ C0] hrtimer_interrupt+0x36e/0xa10 [ 43.604070][ C0] ? asm_sysvec_apic_timer_interrupt+0xa/0x20 [ 43.610148][ C0] __sysvec_apic_timer_interrupt+0x6f/0x200 [ 43.616045][ C0] sysvec_apic_timer_interrupt+0x6f/0x90 [ 43.621689][ C0] asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 43.628278][ C0] RIP: 0033:0x465fcd [ 43.632185][ C0] Code: 8b 44 24 20 b9 40 42 0f 00 f7 f1 48 89 04 24 b8 e8 03 00 00 f7 e2 48 89 44 24 08 48 89 e7 be 00 00 00 00 b8 23 00 00 00 0f 05 <48> 8b 6c 24 10 48 83 c4 18 c3 cc cc cc cc cc cc cc cc cc b8 ba 00 [ 43.651792][ C0] RSP: 002b:000000c00003df18 EFLAGS: 00000202 [ 43.657882][ C0] RAX: 0000000000000000 RBX: 0000000000000014 RCX: 0000000000465fcd [ 43.665862][ C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000c00003df18 [ 43.674136][ C0] RBP: 000000c00003df28 R08: 000000000000e4e5 R09: 0000000000000010 [ 43.682108][ C0] R10: 00007fffc67b50b8 R11: 0000000000000202 R12: 0000000000438920 [ 43.690081][ C0] R13: 0000000000000000 R14: 0000000000b358f8 R15: 0000000000000000 [ 43.698575][ C0] Kernel Offset: disabled [ 43.703150][ C0] Rebooting in 86400 seconds..