[ OK ] Started Daily apt download activities. [ OK ] Started Daily apt upgrade and clean activities. [ OK ] Reached target Timers. [ OK ] Started Regular background program processing daemon. [ OK ] Started System Logging Service. [ OK ] Started Permit User Sessions. [ OK ] Found device /dev/ttyS0. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. [ 72.113271][ T8264] sshd (8264) used greatest stack depth: 22720 bytes left [ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ OK ] Started Getty on tty6. [ OK ] Started Getty on tty5. [ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Warning: Permanently added '10.128.0.210' (ECDSA) to the list of known hosts. Debian GNU/Linux 9 syzkaller ttyS0 executing program syzkaller login: [ 84.022293][ T35] audit: type=1400 audit(1608925417.320:8): avc: denied { execmem } for pid=8491 comm="syz-executor934" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 84.028232][ T8491] ================================================================== [ 84.051216][ T8491] BUG: KASAN: null-ptr-deref in bdi_put+0x22/0xa0 [ 84.057650][ T8491] Write of size 4 at addr 0000000000000040 by task syz-executor934/8491 [ 84.065983][ T8491] [ 84.068304][ T8491] CPU: 1 PID: 8491 Comm: syz-executor934 Not tainted 5.10.0-syzkaller #0 [ 84.076719][ T8491] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 84.086809][ T8491] Call Trace: [ 84.090087][ T8491] dump_stack+0x107/0x163 [ 84.094430][ T8491] ? bdi_put+0x22/0xa0 [ 84.098659][ T8491] ? bdi_put+0x22/0xa0 [ 84.102760][ T8491] kasan_report.cold+0x5f/0xd5 [ 84.107549][ T8491] ? bdi_put+0x22/0xa0 [ 84.111628][ T8491] check_memory_region+0x13d/0x180 [ 84.116754][ T8491] bdi_put+0x22/0xa0 [ 84.120644][ T8491] bdev_evict_inode+0x280/0x4a0 [ 84.125499][ T8491] ? __blkdev_direct_IO_simple+0x930/0x930 [ 84.131304][ T8491] evict+0x2ed/0x6b0 [ 84.135214][ T8491] iput.part.0+0x41e/0x840 [ 84.139631][ T8491] ? __remove_inode_hash+0x130/0x130 [ 84.144935][ T8491] iput+0x58/0x70 [ 84.148584][ T8491] dentry_unlink_inode+0x2b1/0x3d0 [ 84.153893][ T8491] __dentry_kill+0x3c0/0x640 [ 84.158494][ T8491] ? dput+0x35/0xc10 [ 84.162386][ T8491] ? dput+0x35/0xc10 [ 84.166289][ T8491] dput+0x786/0xc10 [ 84.170098][ T8491] shrink_dcache_for_umount+0x11f/0x330 [ 84.175664][ T8491] ? lockdep_hardirqs_on+0x79/0x100 [ 84.180892][ T8491] generic_shutdown_super+0x68/0x370 [ 84.186204][ T8491] kill_anon_super+0x36/0x60 [ 84.190815][ T8491] deactivate_locked_super+0x94/0x160 [ 84.196205][ T8491] deactivate_super+0xad/0xd0 [ 84.200891][ T8491] put_fs_context+0xaa/0x650 [ 84.205487][ T8491] ? __sanitizer_cov_trace_const_cmp2+0x22/0x80 [ 84.211735][ T8491] fscontext_release+0x4c/0x60 [ 84.216516][ T8491] __fput+0x283/0x920 [ 84.220507][ T8491] ? fs_validate_description+0x1d0/0x1d0 [ 84.226165][ T8491] task_work_run+0xdd/0x190 [ 84.230668][ T8491] do_exit+0xb89/0x2a00 [ 84.234831][ T8491] ? rcu_read_lock_sched_held+0x3a/0x70 [ 84.240394][ T8491] ? mm_update_next_owner+0x7a0/0x7a0 [ 84.245774][ T8491] ? __do_sys_fsconfig+0x1c2/0xbd0 [ 84.250897][ T8491] ? fscontext_read+0x310/0x310 [ 84.255762][ T8491] do_group_exit+0x125/0x310 [ 84.260365][ T8491] __x64_sys_exit_group+0x3a/0x50 [ 84.265403][ T8491] do_syscall_64+0x2d/0x70 [ 84.269843][ T8491] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 84.275912][ T8491] RIP: 0033:0x43ee78 [ 84.279813][ T8491] Code: Unable to access opcode bytes at RIP 0x43ee4e. [ 84.286660][ T8491] RSP: 002b:00007ffcd051da28 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 84.295099][ T8491] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ee78 [ 84.303075][ T8491] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 84.311054][ T8491] RBP: 00000000004be688 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 84.319032][ T8491] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 84.327020][ T8491] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 84.335020][ T8491] ================================================================== [ 84.343122][ T8491] Disabling lock debugging due to kernel taint [ 84.350105][ T8491] Kernel panic - not syncing: panic_on_warn set ... [ 84.356735][ T8491] CPU: 1 PID: 8491 Comm: syz-executor934 Tainted: G B 5.10.0-syzkaller #0 [ 84.366551][ T8491] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 84.376611][ T8491] Call Trace: [ 84.379883][ T8491] dump_stack+0x107/0x163 [ 84.384226][ T8491] panic+0x343/0x77f [ 84.388128][ T8491] ? __warn_printk+0xf3/0xf3 [ 84.392723][ T8491] ? preempt_schedule_common+0x59/0xc0 [ 84.398181][ T8491] ? bdi_put+0x22/0xa0 [ 84.402269][ T8491] ? preempt_schedule_thunk+0x16/0x18 [ 84.407662][ T8491] ? trace_hardirqs_on+0x38/0x1c0 [ 84.412699][ T8491] ? trace_hardirqs_on+0x51/0x1c0 [ 84.417738][ T8491] ? bdi_put+0x22/0xa0 [ 84.421806][ T8491] ? bdi_put+0x22/0xa0 [ 84.425875][ T8491] end_report+0x58/0x5e [ 84.430021][ T8491] kasan_report.cold+0x67/0xd5 [ 84.434771][ T8491] ? bdi_put+0x22/0xa0 [ 84.438822][ T8491] check_memory_region+0x13d/0x180 [ 84.443920][ T8491] bdi_put+0x22/0xa0 [ 84.447816][ T8491] bdev_evict_inode+0x280/0x4a0 [ 84.452654][ T8491] ? __blkdev_direct_IO_simple+0x930/0x930 [ 84.458447][ T8491] evict+0x2ed/0x6b0 [ 84.463114][ T8491] iput.part.0+0x41e/0x840 [ 84.467528][ T8491] ? __remove_inode_hash+0x130/0x130 [ 84.472813][ T8491] iput+0x58/0x70 [ 84.476481][ T8491] dentry_unlink_inode+0x2b1/0x3d0 [ 84.481652][ T8491] __dentry_kill+0x3c0/0x640 [ 84.486294][ T8491] ? dput+0x35/0xc10 [ 84.490175][ T8491] ? dput+0x35/0xc10 [ 84.494053][ T8491] dput+0x786/0xc10 [ 84.497861][ T8491] shrink_dcache_for_umount+0x11f/0x330 [ 84.503736][ T8491] ? lockdep_hardirqs_on+0x79/0x100 [ 84.508939][ T8491] generic_shutdown_super+0x68/0x370 [ 84.514307][ T8491] kill_anon_super+0x36/0x60 [ 84.518932][ T8491] deactivate_locked_super+0x94/0x160 [ 84.524309][ T8491] deactivate_super+0xad/0xd0 [ 84.528979][ T8491] put_fs_context+0xaa/0x650 [ 84.533694][ T8491] ? __sanitizer_cov_trace_const_cmp2+0x22/0x80 [ 84.539961][ T8491] fscontext_release+0x4c/0x60 [ 84.544716][ T8491] __fput+0x283/0x920 [ 84.548697][ T8491] ? fs_validate_description+0x1d0/0x1d0 [ 84.554419][ T8491] task_work_run+0xdd/0x190 [ 84.558922][ T8491] do_exit+0xb89/0x2a00 [ 84.563063][ T8491] ? rcu_read_lock_sched_held+0x3a/0x70 [ 84.568601][ T8491] ? mm_update_next_owner+0x7a0/0x7a0 [ 84.573973][ T8491] ? __do_sys_fsconfig+0x1c2/0xbd0 [ 84.579079][ T8491] ? fscontext_read+0x310/0x310 [ 84.584007][ T8491] do_group_exit+0x125/0x310 [ 84.588597][ T8491] __x64_sys_exit_group+0x3a/0x50 [ 84.593635][ T8491] do_syscall_64+0x2d/0x70 [ 84.598047][ T8491] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 84.603950][ T8491] RIP: 0033:0x43ee78 [ 84.608021][ T8491] Code: Unable to access opcode bytes at RIP 0x43ee4e. [ 84.614928][ T8491] RSP: 002b:00007ffcd051da28 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 84.623351][ T8491] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ee78 [ 84.631400][ T8491] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 84.639367][ T8491] RBP: 00000000004be688 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 84.647324][ T8491] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 84.655280][ T8491] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 84.663733][ T8491] Kernel Offset: disabled [ 84.668071][ T8491] Rebooting in 86400 seconds..