[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 56.066358][ T26] audit: type=1800 audit(1566889281.736:25): pid=8654 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 56.111976][ T26] audit: type=1800 audit(1566889281.736:26): pid=8654 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 56.164579][ T26] audit: type=1800 audit(1566889281.736:27): pid=8654 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 '10.128.0.217' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 64.345982][ T8812] ------------[ cut here ]------------ [ 64.351665][ T8812] WARNING: CPU: 1 PID: 8812 at kernel/time/posix-cpu-timers.c:401 posix_cpu_timer_del+0x2f0/0x3b0 [ 64.362345][ T8812] Kernel panic - not syncing: panic_on_warn set ... [ 64.368964][ T8812] CPU: 1 PID: 8812 Comm: syz-executor930 Not tainted 5.3.0-rc6-next-20190826 #73 [ 64.378048][ T8812] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.388092][ T8812] Call Trace: [ 64.391465][ T8812] dump_stack+0x172/0x1f0 [ 64.395817][ T8812] ? posix_cpu_timer_del+0x230/0x3b0 [ 64.401114][ T8812] panic+0x2dc/0x755 [ 64.404989][ T8812] ? add_taint.cold+0x16/0x16 [ 64.410651][ T8812] ? printk+0xba/0xed [ 64.422574][ T8812] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 64.428048][ T8812] ? __warn.cold+0x14/0x3c [ 64.432446][ T8812] ? __warn+0xd9/0x1d0 [ 64.436498][ T8812] ? posix_cpu_timer_del+0x2f0/0x3b0 [ 64.441763][ T8812] __warn.cold+0x2f/0x3c [ 64.445991][ T8812] ? report_bug.cold+0x63/0xad [ 64.450740][ T8812] ? posix_cpu_timer_del+0x2f0/0x3b0 [ 64.456105][ T8812] report_bug+0x289/0x300 [ 64.460431][ T8812] do_error_trap+0x11b/0x200 [ 64.465012][ T8812] do_invalid_op+0x37/0x50 [ 64.469412][ T8812] ? posix_cpu_timer_del+0x2f0/0x3b0 [ 64.474688][ T8812] invalid_op+0x23/0x30 [ 64.478831][ T8812] RIP: 0010:posix_cpu_timer_del+0x2f0/0x3b0 [ 64.484708][ T8812] Code: 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 b5 00 00 00 48 83 bb c8 00 00 00 00 74 16 e8 10 58 0d 00 <0f> 0b e9 87 fe ff ff e8 44 41 48 00 e9 dd fd ff ff e8 fa 57 0d 00 [ 64.504294][ T8812] RSP: 0018:ffff88808bdefa30 EFLAGS: 00010093 [ 64.510360][ T8812] RAX: ffff8880a00f43c0 RBX: ffff88808d983e60 RCX: 1ffff1101401e98a [ 64.518348][ T8812] RDX: 0000000000000000 RSI: ffffffff8164d5c0 RDI: ffff88808d983f28 [ 64.526388][ T8812] RBP: ffff88808bdefac0 R08: 0000000000000002 R09: ffff8880a00f4c58 [ 64.534343][ T8812] R10: fffffbfff138b0f8 R11: ffffffff89c587c7 R12: ffff88808e35c240 [ 64.542295][ T8812] R13: 1ffff110117bdf47 R14: ffff88808bdefa98 R15: ffff88808d983eb8 [ 64.550306][ T8812] ? posix_cpu_timer_del+0x2f0/0x3b0 [ 64.555597][ T8812] ? lock_acquire+0x190/0x410 [ 64.560259][ T8812] ? thread_cpu_clock_getres+0x90/0x90 [ 64.565709][ T8812] ? thread_cpu_clock_getres+0x90/0x90 [ 64.571144][ T8812] exit_itimers+0xdb/0x2e0 [ 64.575549][ T8812] do_exit+0x1980/0x2e60 [ 64.579867][ T8812] ? get_signal+0x392/0x2500 [ 64.584444][ T8812] ? find_held_lock+0x35/0x130 [ 64.589249][ T8812] ? get_signal+0x392/0x2500 [ 64.594185][ T8812] ? mm_update_next_owner+0x640/0x640 [ 64.599543][ T8812] ? lock_downgrade+0x920/0x920 [ 64.604380][ T8812] ? _raw_spin_unlock_irq+0x28/0x90 [ 64.609570][ T8812] ? get_signal+0x392/0x2500 [ 64.614137][ T8812] ? _raw_spin_unlock_irq+0x28/0x90 [ 64.619323][ T8812] do_group_exit+0x135/0x360 [ 64.623893][ T8812] get_signal+0x47c/0x2500 [ 64.628291][ T8812] ? trace_hardirqs_on+0x67/0x240 [ 64.633301][ T8812] ? __kasan_check_read+0x11/0x20 [ 64.638354][ T8812] do_signal+0x87/0x1700 [ 64.642581][ T8812] ? release_posix_timer+0x1e0/0x1e0 [ 64.647858][ T8812] ? setup_sigcontext+0x7d0/0x7d0 [ 64.652869][ T8812] ? __x64_sys_timer_create+0x12b/0x1d0 [ 64.658587][ T8812] ? exit_to_usermode_loop+0x43/0x380 [ 64.663943][ T8812] ? do_syscall_64+0x65f/0x760 [ 64.668684][ T8812] ? exit_to_usermode_loop+0x43/0x380 [ 64.674040][ T8812] ? lockdep_hardirqs_on+0x418/0x5d0 [ 64.679309][ T8812] ? trace_hardirqs_on+0x67/0x240 [ 64.684362][ T8812] exit_to_usermode_loop+0x286/0x380 [ 64.689630][ T8812] do_syscall_64+0x65f/0x760 [ 64.694204][ T8812] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 64.700088][ T8812] RIP: 0033:0x445829 [ 64.703965][ T8812] Code: e8 bc b7 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 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 64.723551][ T8812] RSP: 002b:00007ff7750eadb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 64.731949][ T8812] RAX: fffffffffffffe00 RBX: 00000000006dac38 RCX: 0000000000445829 [ 64.739910][ T8812] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dac38 [ 64.747867][ T8812] RBP: 00000000006dac30 R08: 0000000000000000 R09: 0000000000000000 [ 64.755823][ T8812] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac3c [ 64.763773][ T8812] R13: 00007ffefcc8d83f R14: 00007ff7750eb9c0 R15: 20c49ba5e353f7cf [ 64.773169][ T8812] Kernel Offset: disabled [ 64.777582][ T8812] Rebooting in 86400 seconds..