[ 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 '10.128.0.189' (ECDSA) to the list of known hosts. 2020/05/04 20:16:31 fuzzer started 2020/05/04 20:16:31 dialing manager at 10.128.0.105:33141 2020/05/04 20:16:37 syscalls: 2965 2020/05/04 20:16:37 code coverage: enabled 2020/05/04 20:16:37 comparison tracing: enabled 2020/05/04 20:16:37 extra coverage: enabled 2020/05/04 20:16:37 setuid sandbox: enabled 2020/05/04 20:16:37 namespace sandbox: enabled 2020/05/04 20:16:37 Android sandbox: /sys/fs/selinux/policy does not exist 2020/05/04 20:16:37 fault injection: enabled 2020/05/04 20:16:37 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/05/04 20:16:37 net packet injection: enabled 2020/05/04 20:16:37 net device setup: enabled 2020/05/04 20:16:37 concurrency sanitizer: enabled 2020/05/04 20:16:37 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/05/04 20:16:37 USB emulation: /dev/raw-gadget does not exist syzkaller login: [ 50.745885][ T6702] KCSAN: could not find function: '_find_next_bit' 2020/05/04 20:16:40 adding functions to KCSAN blacklist: '__ext4_new_inode' 'bond_enslave' 'mod_timer' 'add_timer' 'do_nanosleep' 'do_exit' 'blk_mq_sched_dispatch_requests' 'generic_fillattr' '__delete_from_page_cache' 'io_sq_thread' 'page_counter_charge' 'ep_poll' '_find_next_bit' 'do_signal_stop' 'blk_mq_dispatch_rq_list' 'find_get_pages_range_tag' 'xas_clear_mark' 'tick_sched_do_timer' 'dd_has_work' 'tick_nohz_idle_stop_tick' 'kauditd_thread' 'generic_write_end' 'alloc_pid' [ 83.009828][ T6691] ================================================================== [ 83.018072][ T6691] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 83.025965][ T6691] [ 83.028470][ T6691] write to 0xffffffff86fce8c8 of 280 bytes by interrupt on cpu 1: [ 83.036266][ T6691] timekeeping_advance+0x88e/0xd80 [ 83.041451][ T6691] update_wall_time+0x15/0x20 [ 83.046108][ T6691] tick_do_update_jiffies64+0x1e5/0x2a0 [ 83.051629][ T6691] tick_sched_do_timer+0xc7/0xd0 [ 83.056543][ T6691] tick_sched_timer+0x3f/0xd0 [ 83.061197][ T6691] __hrtimer_run_queues+0x271/0x600 [ 83.066383][ T6691] hrtimer_interrupt+0x226/0x490 [ 83.071311][ T6691] smp_apic_timer_interrupt+0xd8/0x270 [ 83.076743][ T6691] apic_timer_interrupt+0xf/0x20 [ 83.081663][ T6691] clear_page_erms+0x7/0x10 [ 83.086140][ T6691] kernel_init_free_pages+0x61/0xa0 [ 83.091316][ T6691] prep_new_page+0xa2/0xb0 [ 83.095728][ T6691] get_page_from_freelist+0x14ce/0x17c0 [ 83.101254][ T6691] __alloc_pages_nodemask+0x158/0x300 [ 83.106608][ T6691] alloc_pages_current+0xca/0x170 [ 83.111607][ T6691] skb_page_frag_refill+0x15e/0x250 [ 83.116789][ T6691] try_fill_recv+0x523/0xdb0 [ 83.121363][ T6691] virtnet_poll+0x62d/0x790 [ 83.125853][ T6691] net_rx_action+0x3ad/0xac0 [ 83.130419][ T6691] __do_softirq+0x118/0x34a [ 83.134909][ T6691] run_ksoftirqd+0x41/0x60 [ 83.139301][ T6691] smpboot_thread_fn+0x374/0x4a0 [ 83.144299][ T6691] kthread+0x203/0x230 [ 83.148351][ T6691] ret_from_fork+0x1f/0x30 [ 83.152743][ T6691] [ 83.155051][ T6691] read to 0xffffffff86fce940 of 8 bytes by task 6691 on cpu 0: [ 83.162567][ T6691] ktime_get_seconds+0x42/0x60 [ 83.167305][ T6691] tcp_rcv_established+0xe79/0xee0 [ 83.172402][ T6691] tcp_v4_do_rcv+0x396/0x4f0 [ 83.176980][ T6691] __release_sock+0x130/0x1e0 [ 83.181630][ T6691] release_sock+0x5e/0x160 [ 83.186018][ T6691] tcp_recvmsg+0x68e/0x1ba0 [ 83.190595][ T6691] inet_recvmsg+0xc1/0x250 [ 83.195013][ T6691] sock_recvmsg+0x8e/0xb0 [ 83.199315][ T6691] sock_read_iter+0x185/0x230 [ 83.203975][ T6691] new_sync_read+0x416/0x450 [ 83.208599][ T6691] __vfs_read+0x9e/0xb0 [ 83.212793][ T6691] vfs_read+0x13e/0x2b0 [ 83.216948][ T6691] ksys_read+0x16a/0x1a0 [ 83.221165][ T6691] __x64_sys_read+0x49/0x60 [ 83.225658][ T6691] do_syscall_64+0xc7/0x3b0 [ 83.230140][ T6691] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 83.235999][ T6691] [ 83.238300][ T6691] Reported by Kernel Concurrency Sanitizer on: [ 83.244427][ T6691] CPU: 0 PID: 6691 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 83.252729][ T6691] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 83.262772][ T6691] ================================================================== [ 83.270810][ T6691] Kernel panic - not syncing: panic_on_warn set ... [ 83.277428][ T6691] CPU: 0 PID: 6691 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 83.286023][ T6691] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 83.296056][ T6691] Call Trace: [ 83.299379][ T6691] dump_stack+0x11d/0x187 [ 83.303730][ T6691] panic+0x210/0x640 [ 83.307604][ T6691] ? vprintk_func+0x89/0x13a [ 83.312174][ T6691] kcsan_report.cold+0xc/0x1a [ 83.316828][ T6691] kcsan_setup_watchpoint+0x3fb/0x440 [ 83.322180][ T6691] ktime_get_seconds+0x42/0x60 [ 83.326920][ T6691] tcp_rcv_established+0xe79/0xee0 [ 83.332013][ T6691] tcp_v4_do_rcv+0x396/0x4f0 [ 83.336583][ T6691] __release_sock+0x130/0x1e0 [ 83.341237][ T6691] release_sock+0x5e/0x160 [ 83.345628][ T6691] tcp_recvmsg+0x68e/0x1ba0 [ 83.350129][ T6691] ? preempt_schedule_common+0x32/0x80 [ 83.355575][ T6691] inet_recvmsg+0xc1/0x250 [ 83.359984][ T6691] ? apparmor_socket_recvmsg+0x38/0x40 [ 83.365423][ T6691] ? inet_sendpage+0xf0/0xf0 [ 83.370619][ T6691] sock_recvmsg+0x8e/0xb0 [ 83.374941][ T6691] sock_read_iter+0x185/0x230 [ 83.379629][ T6691] new_sync_read+0x416/0x450 [ 83.384206][ T6691] __vfs_read+0x9e/0xb0 [ 83.388343][ T6691] vfs_read+0x13e/0x2b0 [ 83.392477][ T6691] ksys_read+0x16a/0x1a0 [ 83.396697][ T6691] __x64_sys_read+0x49/0x60 [ 83.401200][ T6691] do_syscall_64+0xc7/0x3b0 [ 83.405687][ T6691] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 83.411655][ T6691] RIP: 0033:0x47c530 [ 83.415539][ T6691] Code: 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 49 c7 c2 00 00 00 00 49 c7 c0 00 00 00 00 49 c7 c1 00 00 00 00 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 [ 83.435120][ T6691] RSP: 002b:000000c4202677d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 83.443524][ T6691] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 83.451488][ T6691] RDX: 0000000000001000 RSI: 000000c42030a000 RDI: 0000000000000003 [ 83.459455][ T6691] RBP: 000000c420267830 R08: 0000000000000000 R09: 0000000000000000 [ 83.467427][ T6691] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000004 [ 83.475376][ T6691] R13: ffffffffffffffff R14: 0000000000000004 R15: ffffffffffffffff [ 83.485069][ T6691] Kernel Offset: disabled [ 83.489416][ T6691] Rebooting in 86400 seconds..