[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.202' (ECDSA) to the list of known hosts. 2020/06/13 11:18:16 fuzzer started 2020/06/13 11:18:16 dialing manager at 10.128.0.105:43693 2020/06/13 11:18:17 syscalls: 3085 2020/06/13 11:18:17 code coverage: enabled 2020/06/13 11:18:17 comparison tracing: enabled 2020/06/13 11:18:17 extra coverage: enabled 2020/06/13 11:18:17 setuid sandbox: enabled 2020/06/13 11:18:17 namespace sandbox: enabled 2020/06/13 11:18:17 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/13 11:18:17 fault injection: enabled 2020/06/13 11:18:17 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/13 11:18:17 net packet injection: enabled 2020/06/13 11:18:17 net device setup: enabled 2020/06/13 11:18:17 concurrency sanitizer: enabled 2020/06/13 11:18:17 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/13 11:18:17 USB emulation: enabled syzkaller login: [ 54.059430][ T8926] KCSAN: could not find function: '_find_next_bit' 2020/06/13 11:18:18 adding functions to KCSAN blacklist: 'generic_write_end' 'copy_process' 'find_get_pages_range_tag' '_find_next_bit' 'ext4_free_inodes_count' '__ext4_new_inode' 'ep_poll' [ 54.445337][ T8915] ================================================================== [ 54.453439][ T8915] BUG: KCSAN: data-race in __send_signal / futex_wait_queue_me [ 54.461210][ T8915] [ 54.463533][ T8915] write to 0xffff888126a1a0a4 of 4 bytes by task 8912 on cpu 1: [ 54.471137][ T8915] futex_wait_queue_me+0x17d/0x290 [ 54.476231][ T8915] futex_wait+0x17e/0x3a0 [ 54.480531][ T8915] do_futex+0xe2/0x15b0 [ 54.484665][ T8915] __x64_sys_futex+0x2dc/0x410 [ 54.489403][ T8915] do_syscall_64+0xc7/0x3b0 [ 54.493881][ T8915] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 54.499738][ T8915] [ 54.502044][ T8915] read to 0xffff888126a1a0a4 of 4 bytes by task 8915 on cpu 0: [ 54.509557][ T8915] __send_signal+0x468/0x8a0 [ 54.514131][ T8915] send_signal+0x211/0x2a0 [ 54.518533][ T8915] do_send_sig_info+0x59/0xc0 [ 54.523183][ T8915] do_send_specific+0xd8/0x100 [ 54.527922][ T8915] do_tkill+0xf8/0x130 [ 54.531978][ T8915] __x64_sys_tgkill+0x6d/0x90 [ 54.540480][ T8915] do_syscall_64+0xc7/0x3b0 [ 54.544955][ T8915] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 54.550811][ T8915] [ 54.553124][ T8915] Reported by Kernel Concurrency Sanitizer on: [ 54.559275][ T8915] CPU: 0 PID: 8915 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 54.567479][ T8915] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.577504][ T8915] ================================================================== [ 54.585536][ T8915] Kernel panic - not syncing: panic_on_warn set ... [ 54.592106][ T8915] CPU: 0 PID: 8915 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 54.600310][ T8915] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.610368][ T8915] Call Trace: [ 54.613656][ T8915] dump_stack+0x11d/0x187 [ 54.617973][ T8915] panic+0x210/0x640 [ 54.621858][ T8915] ? vprintk_func+0x89/0x13a [ 54.626423][ T8915] kcsan_report.cold+0xc/0x1a [ 54.631079][ T8915] kcsan_setup_watchpoint+0x3fb/0x440 [ 54.636427][ T8915] __send_signal+0x468/0x8a0 [ 54.641009][ T8915] send_signal+0x211/0x2a0 [ 54.645404][ T8915] do_send_sig_info+0x59/0xc0 [ 54.650070][ T8915] do_send_specific+0xd8/0x100 [ 54.654808][ T8915] do_tkill+0xf8/0x130 [ 54.658855][ T8915] __x64_sys_tgkill+0x6d/0x90 [ 54.663508][ T8915] do_syscall_64+0xc7/0x3b0 [ 54.668003][ T8915] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 54.673867][ T8915] RIP: 0033:0x468b26 [ 54.677741][ T8915] 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 [ 54.698273][ T8915] RSP: 002b:000000c000049eb0 EFLAGS: 00000246 ORIG_RAX: 00000000000000ea [ 54.706657][ T8915] RAX: ffffffffffffffda RBX: 000000c000000180 RCX: 0000000000468b26 [ 54.714613][ T8915] RDX: 0000000000000017 RSI: 00000000000022d0 RDI: 00000000000022d0 [ 54.722570][ T8915] RBP: 000000c000049ed0 R08: 0000000000000000 R09: 0000000000000036 [ 54.730516][ T8915] R10: 00007f3b76f99968 R11: 0000000000000246 R12: 00000000010b9d80 [ 54.738461][ T8915] R13: 000000c000000c00 R14: 0000000000000000 R15: 0000000000000000 [ 55.821347][ T8915] Shutting down cpus with NMI [ 55.827612][ T8915] Kernel Offset: disabled [ 55.831929][ T8915] Rebooting in 86400 seconds..