[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.665861][ T26] audit: type=1800 audit(1572271474.921:25): pid=7121 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.710379][ T26] audit: type=1800 audit(1572271474.921:26): pid=7121 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 36.732371][ T26] audit: type=1800 audit(1572271474.931:27): pid=7121 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.123' (ECDSA) to the list of known hosts. 2019/10/28 14:04:45 fuzzer started 2019/10/28 14:04:47 dialing manager at 10.128.0.105:33655 2019/10/28 14:04:47 syscalls: 2533 syzkaller login: [ 49.209557][ T7273] ================================================================== [ 49.217794][ T7273] BUG: KCSAN: data-race in pipe_poll / pipe_write [ 49.224189][ T7273] [ 49.226522][ T7273] write to 0xffff888123c58038 of 4 bytes by task 7289 on cpu 1: [ 49.234160][ T7273] pipe_write+0x268/0x970 [ 49.238484][ T7273] new_sync_write+0x388/0x4a0 [ 49.243152][ T7273] __vfs_write+0xb1/0xc0 [ 49.247405][ T7273] vfs_write+0x18a/0x390 [ 49.251643][ T7273] ksys_write+0xd5/0x1b0 [ 49.255876][ T7273] __x64_sys_write+0x4c/0x60 [ 49.260483][ T7273] do_syscall_64+0xcc/0x370 [ 49.264972][ T7273] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 49.270850][ T7273] [ 49.273173][ T7273] read to 0xffff888123c58038 of 4 bytes by task 7273 on cpu 0: [ 49.280719][ T7273] pipe_poll+0x84/0x1d0 [ 49.284868][ T7273] do_select+0x7d0/0x1020 [ 49.289190][ T7273] core_sys_select+0x381/0x550 [ 49.293942][ T7273] kern_select+0x106/0x170 [ 49.298351][ T7273] __x64_sys_select+0x70/0x90 [ 49.303027][ T7273] do_syscall_64+0xcc/0x370 [ 49.307524][ T7273] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 49.313488][ T7273] [ 49.315802][ T7273] Reported by Kernel Concurrency Sanitizer on: [ 49.321952][ T7273] CPU: 0 PID: 7273 Comm: sshd Not tainted 5.4.0-rc3+ #0 [ 49.328874][ T7273] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.338917][ T7273] ================================================================== [ 49.346965][ T7273] Kernel panic - not syncing: panic_on_warn set ... [ 49.353630][ T7273] CPU: 0 PID: 7273 Comm: sshd Not tainted 5.4.0-rc3+ #0 [ 49.360548][ T7273] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.370643][ T7273] Call Trace: [ 49.373943][ T7273] dump_stack+0xf5/0x159 [ 49.378186][ T7273] panic+0x210/0x640 [ 49.382076][ T7273] ? vprintk_func+0x8d/0x140 [ 49.386668][ T7273] kcsan_report.cold+0xc/0x10 [ 49.391339][ T7273] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 49.396889][ T7273] ? generic_pipe_buf_confirm+0x20/0x20 [ 49.402420][ T7273] __tsan_read4+0x2c/0x30 [ 49.406739][ T7273] pipe_poll+0x84/0x1d0 [ 49.410891][ T7273] ? generic_pipe_buf_confirm+0x20/0x20 [ 49.416519][ T7273] do_select+0x7d0/0x1020 [ 49.420871][ T7273] ? poll_select_finish+0x440/0x440 [ 49.426066][ T7273] ? poll_select_finish+0x440/0x440 [ 49.431263][ T7273] ? poll_select_finish+0x440/0x440 [ 49.436467][ T7273] ? poll_select_finish+0x440/0x440 [ 49.441675][ T7273] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 49.447301][ T7273] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 49.452930][ T7273] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 49.459082][ T7273] ? __tsan_read8+0x2c/0x30 [ 49.463587][ T7273] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 49.469304][ T7273] ? __mark_inode_dirty+0x285/0x940 [ 49.474509][ T7273] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 49.480138][ T7273] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 49.485769][ T7273] ? __tsan_read8+0x2c/0x30 [ 49.490264][ T7273] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 49.495890][ T7273] ? check_stack_object+0xda/0x110 [ 49.500999][ T7273] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 49.506619][ T7273] ? __tsan_read8+0x2c/0x30 [ 49.511119][ T7273] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 49.517354][ T7273] core_sys_select+0x381/0x550 [ 49.528029][ T7273] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 49.533653][ T7273] ? __tsan_read8+0x2c/0x30 [ 49.538151][ T7273] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 49.544033][ T7273] ? __tsan_write8+0x32/0x40 [ 49.548628][ T7273] ? ktime_get_ts64+0x286/0x2c0 [ 49.553468][ T7273] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 49.559174][ T7273] ? timespec64_add_safe+0xae/0xd0 [ 49.564285][ T7273] kern_select+0x106/0x170 [ 49.568701][ T7273] __x64_sys_select+0x70/0x90 [ 49.573379][ T7273] do_syscall_64+0xcc/0x370 [ 49.577880][ T7273] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 49.583778][ T7273] RIP: 0033:0x7f8b567d5dd3 [ 49.588195][ T7273] Code: 48 29 c2 64 89 11 48 83 c8 ff eb ea 90 90 90 90 90 90 90 90 90 90 90 83 3d 25 48 2b 00 00 75 13 49 89 ca b8 17 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 34 c3 48 83 ec 08 e8 ab 2f 01 00 48 89 04 24 [ 49.607789][ T7273] RSP: 002b:00007ffe3e7f88b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000017 [ 49.616193][ T7273] RAX: ffffffffffffffda RBX: 00007ffe3e7f8940 RCX: 00007f8b567d5dd3 [ 49.624158][ T7273] RDX: 0000559b43279b00 RSI: 0000559b43279b20 RDI: 000000000000000c [ 49.632137][ T7273] RBP: 0000559b4133b8dc R08: 00007ffe3e7f88e0 R09: 0101010101010101 [ 49.640098][ T7273] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe3e7f8948 [ 49.648060][ T7273] R13: 0000000000000000 R14: 00007ffe3e7f8938 R15: 00007ffe3e7f893c [ 49.657512][ T7273] Kernel Offset: disabled [ 49.661883][ T7273] Rebooting in 86400 seconds..