[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 62.663952][ T26] audit: type=1800 audit(1575218452.211:25): pid=8910 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 62.683973][ T26] audit: type=1800 audit(1575218452.221:26): pid=8910 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 62.735670][ T26] audit: type=1800 audit(1575218452.221:27): pid=8910 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 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 '10.128.0.192' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 73.701467][ C0] hrtimer: interrupt took 44221 ns executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 98.137875][ T9433] ------------[ cut here ]------------ [ 98.143427][ T9433] kernel BUG at fs/pipe.c:582! [ 98.152169][ T9433] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 98.158260][ T9433] CPU: 0 PID: 9433 Comm: syz-executor802 Not tainted 5.4.0-syzkaller #0 [ 98.166608][ T9433] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 98.176699][ T9433] RIP: 0010:pipe_poll+0x37f/0x400 [ 98.181756][ T9433] Code: ff 85 db 75 09 e8 b1 ee b5 ff 41 83 ce 08 e8 a8 ee b5 ff 44 89 f0 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 91 ee b5 ff <0f> 0b e8 ca 40 f3 ff e9 ed fc ff ff e8 c0 40 f3 ff e9 b3 fd ff ff [ 98.201348][ T9433] RSP: 0018:ffff888093e3f698 EFLAGS: 00010293 [ 98.207394][ T9433] RAX: ffff8880a96083c0 RBX: ffff88809af6e800 RCX: ffffffff81beed8a [ 98.215364][ T9433] RDX: 0000000000000000 RSI: ffffffff81beefaf RDI: 0000000000000004 [ 98.223317][ T9433] RBP: ffff888093e3f6d0 R08: ffff8880a96083c0 R09: ffff8880a9608c50 [ 98.231368][ T9433] R10: fffffbfff146e220 R11: ffffffff8a371107 R12: ffff88809c770d40 [ 98.239363][ T9433] R13: 00000000fffffffa R14: 0000000000000010 R15: 00000000000001f6 [ 98.247318][ T9433] FS: 00007fc5aa3cb700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 98.256225][ T9433] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 98.262789][ T9433] CR2: 0000000020200000 CR3: 000000009b5a1000 CR4: 00000000001406f0 [ 98.270744][ T9433] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 98.278705][ T9433] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 98.286666][ T9433] Call Trace: [ 98.289946][ T9433] ? pipe_unlock+0x80/0x80 [ 98.294339][ T9433] do_select+0x922/0x16f0 [ 98.298658][ T9433] ? select_estimate_accuracy+0x330/0x330 [ 98.304356][ T9433] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 98.309795][ T9433] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 98.315233][ T9433] ? poll_freewait+0x260/0x260 [ 98.319988][ T9433] ? poll_freewait+0x260/0x260 [ 98.324742][ T9433] ? poll_freewait+0x260/0x260 [ 98.329488][ T9433] ? poll_freewait+0x260/0x260 [ 98.334251][ T9433] ? poll_freewait+0x260/0x260 [ 98.339012][ T9433] ? poll_freewait+0x260/0x260 [ 98.343793][ T9433] ? poll_freewait+0x260/0x260 [ 98.348544][ T9433] ? poll_freewait+0x260/0x260 [ 98.353291][ T9433] ? poll_freewait+0x260/0x260 [ 98.358181][ T9433] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 98.364408][ T9433] core_sys_select+0x53c/0x8c0 [ 98.369154][ T9433] ? core_sys_select+0x53c/0x8c0 [ 98.374083][ T9433] ? do_compat_pselect+0x230/0x230 [ 98.379186][ T9433] ? __might_fault+0x12b/0x1e0 [ 98.383954][ T9433] ? futex_exit_release+0x70/0x70 [ 98.388978][ T9433] ? lock_downgrade+0x920/0x920 [ 98.393829][ T9433] ? set_user_sigmask+0x166/0x1e0 [ 98.398836][ T9433] ? sigprocmask+0x2b0/0x2b0 [ 98.403412][ T9433] ? __kasan_check_read+0x11/0x20 [ 98.408427][ T9433] ? _copy_to_user+0x118/0x160 [ 98.413186][ T9433] do_pselect.constprop.0+0x199/0x1e0 [ 98.418536][ T9433] ? kern_select+0x1e0/0x1e0 [ 98.423104][ T9433] ? __x64_sys_futex+0x404/0x590 [ 98.428025][ T9433] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 98.433462][ T9433] __x64_sys_pselect6+0x1fc/0x2e0 [ 98.438567][ T9433] do_syscall_64+0xfa/0x790 [ 98.443056][ T9433] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 98.448941][ T9433] RIP: 0033:0x44a629 [ 98.452819][ T9433] Code: e8 5c b3 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 2b cc fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 98.472410][ T9433] RSP: 002b:00007fc5aa3cada8 EFLAGS: 00000246 ORIG_RAX: 000000000000010e [ 98.480799][ T9433] RAX: ffffffffffffffda RBX: 00000000006dbc38 RCX: 000000000044a629 [ 98.488755][ T9433] RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000040 [ 98.496704][ T9433] RBP: 00000000006dbc30 R08: 0000000000000000 R09: 0000000000000000 [ 98.504672][ T9433] R10: 0000000020000140 R11: 0000000000000246 R12: 00000000006dbc3c [ 98.512625][ T9433] R13: 00007fffcaf6d1bf R14: 00007fc5aa3cb9c0 R15: 20c49ba5e353f7cf [ 98.520578][ T9433] Modules linked in: [ 98.526796][ T9433] ---[ end trace 1c441dd64ff48137 ]--- [ 98.532395][ T9433] RIP: 0010:pipe_poll+0x37f/0x400 [ 98.537859][ T9433] Code: ff 85 db 75 09 e8 b1 ee b5 ff 41 83 ce 08 e8 a8 ee b5 ff 44 89 f0 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 91 ee b5 ff <0f> 0b e8 ca 40 f3 ff e9 ed fc ff ff e8 c0 40 f3 ff e9 b3 fd ff ff [ 98.557971][ T9433] RSP: 0018:ffff888093e3f698 EFLAGS: 00010293 [ 98.564401][ T9433] RAX: ffff8880a96083c0 RBX: ffff88809af6e800 RCX: ffffffff81beed8a [ 98.572782][ T9433] RDX: 0000000000000000 RSI: ffffffff81beefaf RDI: 0000000000000004 [ 98.580996][ T9433] RBP: ffff888093e3f6d0 R08: ffff8880a96083c0 R09: ffff8880a9608c50 [ 98.589096][ T9433] R10: fffffbfff146e220 R11: ffffffff8a371107 R12: ffff88809c770d40 [ 98.597171][ T9433] R13: 00000000fffffffa R14: 0000000000000010 R15: 00000000000001f6 [ 98.605174][ T9433] FS: 00007fc5aa3cb700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 98.614194][ T9433] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 98.620855][ T9433] CR2: 0000000020200000 CR3: 000000009b5a1000 CR4: 00000000001406f0 [ 98.628855][ T9433] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 98.636846][ T9433] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 98.644894][ T9433] Kernel panic - not syncing: Fatal exception [ 98.652273][ T9433] Kernel Offset: disabled [ 98.656596][ T9433] Rebooting in 86400 seconds..