[ 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 '10.128.0.109' (ECDSA) to the list of known hosts. 2020/06/16 23:09:03 fuzzer started 2020/06/16 23:09:03 dialing manager at 10.128.0.105:33867 2020/06/16 23:09:04 syscalls: 3085 2020/06/16 23:09:04 code coverage: enabled 2020/06/16 23:09:04 comparison tracing: enabled 2020/06/16 23:09:04 extra coverage: enabled 2020/06/16 23:09:04 setuid sandbox: enabled 2020/06/16 23:09:04 namespace sandbox: enabled 2020/06/16 23:09:04 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/16 23:09:04 fault injection: enabled 2020/06/16 23:09:04 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/16 23:09:04 net packet injection: enabled 2020/06/16 23:09:04 net device setup: enabled 2020/06/16 23:09:04 concurrency sanitizer: enabled 2020/06/16 23:09:04 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/16 23:09:04 USB emulation: enabled 2020/06/16 23:09:05 suppressing KCSAN reports in functions: 'copy_process' 'blk_mq_get_request' 'generic_write_end' 'ep_poll' 'generic_fillattr' 'find_get_pages_range_tag' '__send_signal' 'alloc_pid' 'ptrace_check_attach' '__ext4_new_inode' syzkaller login: [ 51.571145][ T8879] ================================================================== [ 51.579824][ T8879] BUG: KCSAN: data-race in complete_signal / futex_wait_queue_me [ 51.587671][ T8879] [ 51.590025][ T8879] write to 0xffff88812a8c0064 of 4 bytes by task 8883 on cpu 1: [ 51.597637][ T8879] futex_wait_queue_me+0x17d/0x290 [ 51.602747][ T8879] futex_wait+0x17e/0x3a0 [ 51.607055][ T8879] do_futex+0xe2/0x15b0 [ 51.611185][ T8879] __x64_sys_futex+0x2dc/0x410 [ 51.615929][ T8879] do_syscall_64+0xc7/0x3b0 [ 51.620409][ T8879] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 51.626270][ T8879] [ 51.628579][ T8879] read to 0xffff88812a8c0064 of 4 bytes by task 8879 on cpu 0: [ 51.636100][ T8879] complete_signal+0x85/0x5c0 [ 51.640766][ T8879] __send_signal+0x675/0x8a0 [ 51.645346][ T8879] send_signal+0x211/0x2a0 [ 51.649739][ T8879] do_send_sig_info+0x59/0xc0 [ 51.654393][ T8879] do_send_specific+0xd8/0x100 [ 51.659149][ T8879] do_tkill+0xf8/0x130 [ 51.663197][ T8879] __x64_sys_tgkill+0x6d/0x90 [ 51.667868][ T8879] do_syscall_64+0xc7/0x3b0 [ 51.672349][ T8879] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 51.678229][ T8879] [ 51.680537][ T8879] Reported by Kernel Concurrency Sanitizer on: [ 51.686682][ T8879] CPU: 0 PID: 8879 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 51.694890][ T8879] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.704921][ T8879] ================================================================== [ 51.712956][ T8879] Kernel panic - not syncing: panic_on_warn set ... [ 51.719541][ T8879] CPU: 0 PID: 8879 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 51.727749][ T8879] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.737778][ T8879] Call Trace: [ 51.741053][ T8879] dump_stack+0x11d/0x187 [ 51.745364][ T8879] panic+0x210/0x640 [ 51.749243][ T8879] ? vprintk_func+0x89/0x13a [ 51.753813][ T8879] kcsan_report.cold+0xc/0x1a [ 51.758473][ T8879] kcsan_setup_watchpoint+0x3fb/0x440 [ 51.763823][ T8879] complete_signal+0x85/0x5c0 [ 51.768498][ T8879] ? __sigqueue_alloc+0x190/0x2c0 [ 51.773609][ T8879] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 51.779483][ T8879] __send_signal+0x675/0x8a0 [ 51.784056][ T8879] send_signal+0x211/0x2a0 [ 51.788457][ T8879] do_send_sig_info+0x59/0xc0 [ 51.793116][ T8879] do_send_specific+0xd8/0x100 [ 51.797904][ T8879] do_tkill+0xf8/0x130 [ 51.801954][ T8879] __x64_sys_tgkill+0x6d/0x90 [ 51.806612][ T8879] do_syscall_64+0xc7/0x3b0 [ 51.811101][ T8879] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 51.816969][ T8879] RIP: 0033:0x468b26 [ 51.820846][ T8879] Code: cc cc cc cc b8 27 00 00 00 0f 05 48 89 44 24 08 c3 cc cc cc 48 8b 7c 24 08 48 8b 74 24 10 48 8b 54 24 18 b8 ea 00 00 00 0f 05 cc cc cc cc cc cc cc cc cc 8b 7c 24 08 48 8b 74 24 10 48 8b 54 [ 51.840519][ T8879] RSP: 002b:00007ffdc2262c48 EFLAGS: 00000246 ORIG_RAX: 00000000000000ea [ 51.848912][ T8879] RAX: ffffffffffffffda RBX: 000000c000000180 RCX: 0000000000468b26 [ 51.856860][ T8879] RDX: 0000000000000017 RSI: 00000000000022b3 RDI: 00000000000022af [ 51.864808][ T8879] RBP: 00007ffdc2262c68 R08: 00007ffdc22d6080 R09: 0000000000000033 [ 51.872755][ T8879] R10: 00007ffdc2262c30 R11: 0000000000000246 R12: 00000000000000f8 [ 51.880714][ T8879] R13: 000000c0003501e0 R14: 0000000000000004 R15: 0000000000000080 [ 51.889929][ T8879] Kernel Offset: disabled [ 51.894246][ T8879] Rebooting in 86400 seconds..