[ 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 '10.128.0.215' (ECDSA) to the list of known hosts. 2020/05/19 12:10:05 fuzzer started 2020/05/19 12:10:05 dialing manager at 10.128.0.105:39959 2020/05/19 12:10:05 syscalls: 3055 2020/05/19 12:10:05 code coverage: enabled 2020/05/19 12:10:05 comparison tracing: enabled 2020/05/19 12:10:05 extra coverage: enabled 2020/05/19 12:10:05 setuid sandbox: enabled 2020/05/19 12:10:05 namespace sandbox: enabled 2020/05/19 12:10:05 Android sandbox: /sys/fs/selinux/policy does not exist 2020/05/19 12:10:05 fault injection: enabled 2020/05/19 12:10:05 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/05/19 12:10:05 net packet injection: enabled 2020/05/19 12:10:05 net device setup: enabled 2020/05/19 12:10:05 concurrency sanitizer: enabled 2020/05/19 12:10:05 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/05/19 12:10:05 USB emulation: enabled syzkaller login: [ 50.559179][ T8915] KCSAN: could not find function: '_find_next_bit' 2020/05/19 12:10:08 adding functions to KCSAN blacklist: 'pcpu_alloc' 'get_cpu_idle_time_us' 'copy_process' '__perf_event_overflow' '__snd_rawmidi_transmit_ack' 'find_get_pages_range_tag' 'generic_write_end' '_find_next_bit' 'ext4_mark_iloc_dirty' 'kauditd_thread' 'generic_fillattr' 'page_counter_charge' 'alloc_pid' 'vfs_readlink' 'ep_poll' 'do_nanosleep' 'blk_mq_sched_dispatch_requests' 'wbt_done' '__filemap_fdatawrite_range' '__rb_erase_color' '__ext4_new_inode' 'xas_clear_mark' [ 83.671446][ C1] ================================================================== [ 83.679699][ C1] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 83.687840][ C1] [ 83.690170][ C1] write to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 0: [ 83.697837][ C1] tick_sched_do_timer+0xb4/0xd0 [ 83.702775][ C1] tick_sched_timer+0x3f/0xd0 [ 83.707450][ C1] __hrtimer_run_queues+0x271/0x600 [ 83.713251][ C1] hrtimer_interrupt+0x226/0x490 [ 83.718190][ C1] smp_apic_timer_interrupt+0xd8/0x270 [ 83.723647][ C1] apic_timer_interrupt+0xf/0x20 [ 83.728590][ C1] __sanitizer_cov_trace_const_cmp8+0x4/0x20 [ 83.734655][ C1] skb_release_head_state+0x32/0x180 [ 83.740043][ C1] skb_release_all+0x1b/0x50 [ 83.744643][ C1] __kfree_skb+0x1b/0x30 [ 83.748888][ C1] tcp_recvmsg+0x107a/0x1ba0 [ 83.753472][ C1] inet_recvmsg+0xc1/0x250 [ 83.758070][ C1] sock_recvmsg+0x8e/0xb0 [ 83.762401][ C1] sock_read_iter+0x185/0x230 [ 83.767089][ C1] new_sync_read+0x416/0x450 [ 83.771795][ C1] __vfs_read+0x9e/0xb0 [ 83.775953][ C1] vfs_read+0x13e/0x2b0 [ 83.780112][ C1] ksys_read+0x16a/0x1a0 [ 83.784351][ C1] __x64_sys_read+0x49/0x60 [ 83.788860][ C1] do_syscall_64+0xc7/0x3b0 [ 83.793367][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 83.800201][ C1] [ 83.802522][ C1] read to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 1: [ 83.810515][ C1] tick_sched_do_timer+0x2e/0xd0 [ 83.815458][ C1] tick_sched_timer+0x3f/0xd0 [ 83.820127][ C1] __hrtimer_run_queues+0x271/0x600 [ 83.825398][ C1] hrtimer_interrupt+0x226/0x490 [ 83.830323][ C1] smp_apic_timer_interrupt+0xd8/0x270 [ 83.835775][ C1] apic_timer_interrupt+0xf/0x20 [ 83.840705][ C1] __sanitizer_cov_trace_pc+0x9/0x50 [ 83.845976][ C1] timespec64_add_safe+0xa9/0xd0 [ 83.850902][ C1] poll_select_set_timeout+0xce/0xe0 [ 83.856169][ C1] do_pselect.constprop.0+0x9e/0x160 [ 83.861453][ C1] __x64_sys_pselect6+0x12a/0x160 [ 83.866559][ C1] do_syscall_64+0xc7/0x3b0 [ 83.871045][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 83.876916][ C1] [ 83.879222][ C1] Reported by Kernel Concurrency Sanitizer on: [ 83.885360][ C1] CPU: 1 PID: 8900 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 83.893575][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 83.903645][ C1] ================================================================== [ 83.911693][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 83.918296][ C1] CPU: 1 PID: 8900 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 83.926513][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 83.936822][ C1] Call Trace: [ 83.940086][ C1] [ 83.942930][ C1] dump_stack+0x11d/0x187 [ 83.947251][ C1] panic+0x210/0x640 [ 83.951135][ C1] ? vprintk_func+0x89/0x13a [ 83.955735][ C1] kcsan_report.cold+0xc/0x1a [ 83.960430][ C1] kcsan_setup_watchpoint+0x3fb/0x440 [ 83.965828][ C1] tick_sched_do_timer+0x2e/0xd0 [ 83.970762][ C1] tick_sched_timer+0x3f/0xd0 [ 83.975429][ C1] __hrtimer_run_queues+0x271/0x600 [ 83.980617][ C1] ? tick_sched_do_timer+0xd0/0xd0 [ 83.985719][ C1] hrtimer_interrupt+0x226/0x490 [ 83.990648][ C1] ? kvm_clock_read+0x14/0x30 [ 83.995320][ C1] smp_apic_timer_interrupt+0xd8/0x270 [ 84.000785][ C1] apic_timer_interrupt+0xf/0x20 [ 84.005751][ C1] [ 84.008692][ C1] RIP: 0010:__sanitizer_cov_trace_pc+0x9/0x50 [ 84.014749][ C1] Code: cc 65 48 8b 04 25 40 8c 01 00 48 8b 80 68 0a 00 00 c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 65 48 8b 04 25 40 8c 01 00 <65> 8b 15 38 ee ba 7e 81 e2 00 01 1f 00 48 8b 34 24 75 2b 8b 90 50 [ 84.034339][ C1] RSP: 0018:ffffc90000ee7df8 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 [ 84.042739][ C1] RAX: ffff888128884040 RBX: 0000000000000053 RCX: ffffffff813c908f [ 84.050705][ C1] RDX: 0000000000000053 RSI: 0000000000000000 RDI: 0000000000000006 [ 84.058683][ C1] RBP: ffffc90000ee7e20 R08: ffff888128884040 R09: 0000c90000ee7e78 [ 84.066656][ C1] R10: 0000c90000ee7e80 R11: 0000c90000ee7e87 R12: 00000000282024e7 [ 84.074617][ C1] R13: 0000000000000053 R14: 0000000000000000 R15: 0000000000000000 [ 84.082590][ C1] ? timespec64_add_safe+0x9f/0xd0 [ 84.087695][ C1] timespec64_add_safe+0xa9/0xd0 [ 84.092716][ C1] poll_select_set_timeout+0xce/0xe0 [ 84.098166][ C1] do_pselect.constprop.0+0x9e/0x160 [ 84.103457][ C1] __x64_sys_pselect6+0x12a/0x160 [ 84.108474][ C1] ? constant_test_bit+0xd/0x30 [ 84.113336][ C1] do_syscall_64+0xc7/0x3b0 [ 84.117829][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 84.123706][ C1] RIP: 0033:0x45ac23 [ 84.127623][ C1] Code: 48 89 44 24 08 bf 00 00 00 00 be 00 00 00 00 ba 00 00 00 00 41 ba 00 00 00 00 49 89 e0 41 b9 00 00 00 00 b8 0e 01 00 00 0f 05 <48> 8b 6c 24 10 48 83 c4 18 c3 cc cc cc b8 ba 00 00 00 0f 05 89 44 [ 84.147216][ C1] RSP: 002b:000000c42004ff08 EFLAGS: 00000202 ORIG_RAX: 000000000000010e [ 84.155630][ C1] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045ac23 [ 84.163603][ C1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 84.171576][ C1] RBP: 000000c42004ff18 R08: 000000c42004ff08 R09: 0000000000000000 [ 84.179536][ C1] R10: 0000000000000000 R11: 0000000000000202 R12: 000000000042f0a0 [ 84.187496][ C1] R13: 00000000000000f1 R14: 0000000000000011 R15: 0000000000000000 [ 84.196284][ C1] Kernel Offset: disabled [ 84.200618][ C1] Rebooting in 86400 seconds..