[ 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 '10.128.10.19' (ECDSA) to the list of known hosts. 2020/07/30 09:52:25 fuzzer started 2020/07/30 09:52:25 dialing manager at 10.128.0.105:35629 2020/07/30 09:52:25 syscalls: 3254 2020/07/30 09:52:25 code coverage: enabled 2020/07/30 09:52:25 comparison tracing: enabled 2020/07/30 09:52:25 extra coverage: enabled 2020/07/30 09:52:25 setuid sandbox: enabled 2020/07/30 09:52:25 namespace sandbox: enabled 2020/07/30 09:52:25 Android sandbox: /sys/fs/selinux/policy does not exist 2020/07/30 09:52:25 fault injection: enabled 2020/07/30 09:52:25 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/07/30 09:52:25 net packet injection: enabled 2020/07/30 09:52:25 net device setup: enabled 2020/07/30 09:52:25 concurrency sanitizer: enabled 2020/07/30 09:52:25 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/07/30 09:52:25 USB emulation: enabled 2020/07/30 09:52:25 hci packet injection: enabled 2020/07/30 09:52:26 suppressing KCSAN reports in functions: 'ext4_mb_find_by_goal' 'blk_mq_rq_ctx_init' 'find_get_pages_range_tag' 'expire_timers' 'alloc_pid' 'do_nanosleep' '__ext4_new_inode' 'generic_write_end' '__xa_clear_mark' syzkaller login: [ 32.136754][ T8652] ================================================================== [ 32.144846][ T8652] BUG: KCSAN: data-race in do_epoll_wait / ep_poll_callback [ 32.152092][ T8652] [ 32.154395][ T8652] write to 0xffff88812461ddd0 of 8 bytes by task 8642 on cpu 0: [ 32.161993][ T8652] ep_poll_callback+0x29c/0x510 [ 32.166822][ T8652] __wake_up_common+0xbc/0x130 [ 32.171554][ T8652] __wake_up_sync_key+0x83/0xc0 [ 32.176390][ T8652] sock_def_readable+0x61/0xe0 [ 32.181161][ T8652] tcp_rcv_established+0x13c0/0x1520 [ 32.186427][ T8652] tcp_v4_do_rcv+0x25e/0x480 [ 32.190996][ T8652] __release_sock+0xf5/0x260 [ 32.195582][ T8652] release_sock+0x40/0x110 [ 32.199988][ T8652] tcp_recvmsg+0x16ba/0x1c10 [ 32.204560][ T8652] inet_recvmsg+0xa9/0x210 [ 32.208948][ T8652] sock_read_iter+0x19c/0x1e0 [ 32.213600][ T8652] vfs_read+0x523/0x590 [ 32.217727][ T8652] ksys_read+0xce/0x180 [ 32.221852][ T8652] __x64_sys_read+0x3e/0x50 [ 32.226336][ T8652] do_syscall_64+0x51/0xb0 [ 32.230724][ T8652] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 32.236579][ T8652] [ 32.238897][ T8652] read to 0xffff88812461ddd0 of 8 bytes by task 8652 on cpu 1: [ 32.246421][ T8652] do_epoll_wait+0x2e2/0x870 [ 32.250990][ T8652] __x64_sys_epoll_pwait+0x92/0x150 [ 32.256157][ T8652] do_syscall_64+0x51/0xb0 [ 32.260545][ T8652] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 32.266400][ T8652] [ 32.268698][ T8652] Reported by Kernel Concurrency Sanitizer on: [ 32.274823][ T8652] CPU: 1 PID: 8652 Comm: syz-fuzzer Not tainted 5.8.0-rc7-syzkaller #0 [ 32.283025][ T8652] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.293049][ T8652] ================================================================== [ 32.301177][ T8652] Kernel panic - not syncing: panic_on_warn set ... [ 32.307735][ T8652] CPU: 1 PID: 8652 Comm: syz-fuzzer Not tainted 5.8.0-rc7-syzkaller #0 [ 32.315939][ T8652] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.325965][ T8652] Call Trace: [ 32.329228][ T8652] dump_stack+0x10f/0x19d [ 32.333538][ T8652] panic+0x207/0x64a [ 32.337406][ T8652] ? vprintk_emit+0x44a/0x4f0 [ 32.342143][ T8652] kcsan_report+0x684/0x690 [ 32.346624][ T8652] ? kcsan_setup_watchpoint+0x453/0x4d0 [ 32.352227][ T8652] ? do_epoll_wait+0x2e2/0x870 [ 32.356963][ T8652] ? __x64_sys_epoll_pwait+0x92/0x150 [ 32.362303][ T8652] ? do_syscall_64+0x51/0xb0 [ 32.366876][ T8652] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 32.372921][ T8652] ? ep_send_events_proc+0x4fd/0x620 [ 32.378179][ T8652] kcsan_setup_watchpoint+0x453/0x4d0 [ 32.383523][ T8652] do_epoll_wait+0x2e2/0x870 [ 32.388102][ T8652] ? debug_smp_processor_id+0x18/0x20 [ 32.393453][ T8652] __x64_sys_epoll_pwait+0x92/0x150 [ 32.398629][ T8652] do_syscall_64+0x51/0xb0 [ 32.403026][ T8652] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 32.408896][ T8652] RIP: 0033:0x469240 [ 32.412763][ T8652] Code: 0f 05 89 44 24 20 c3 cc cc cc 8b 7c 24 08 48 8b 74 24 10 8b 54 24 18 44 8b 54 24 1c 49 c7 c0 00 00 00 00 b8 19 01 00 00 0f 05 <89> 44 24 20 c3 cc cc cc cc cc cc cc cc cc cc cc 8b 7c 24 08 48 c7 [ 32.432339][ T8652] RSP: 002b:000000c0003137f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 32.440739][ T8652] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000469240 [ 32.448683][ T8652] RDX: 0000000000000080 RSI: 000000c000313840 RDI: 0000000000000003 [ 32.456625][ T8652] RBP: 000000c000313e40 R08: 0000000000000000 R09: 0000000000000000 [ 32.464567][ T8652] R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000003 [ 32.472508][ T8652] R13: 000000c0003fc780 R14: 0000000000000002 R15: 0000000000000002 [ 32.481637][ T8652] Kernel Offset: disabled [ 32.485943][ T8652] Rebooting in 86400 seconds..