[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.52' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 87.072010][ T36] audit: type=1400 audit(1609569914.258:8): avc: denied { execmem } for pid=8483 comm="syz-executor152" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 87.078838][ T8483] ================================================================== [ 87.100919][ T8483] BUG: KASAN: null-ptr-deref in bdi_put+0x22/0xa0 [ 87.107354][ T8483] Write of size 4 at addr 0000000000000040 by task syz-executor152/8483 [ 87.115766][ T8483] [ 87.118093][ T8483] CPU: 0 PID: 8483 Comm: syz-executor152 Not tainted 5.11.0-rc1-syzkaller #0 [ 87.126857][ T8483] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 87.136934][ T8483] Call Trace: [ 87.140221][ T8483] dump_stack+0x107/0x163 [ 87.144551][ T8483] ? bdi_put+0x22/0xa0 [ 87.148613][ T8483] ? bdi_put+0x22/0xa0 [ 87.152946][ T8483] kasan_report.cold+0x5f/0xd5 [ 87.157753][ T8483] ? bdi_put+0x22/0xa0 [ 87.161825][ T8483] check_memory_region+0x13d/0x180 [ 87.166960][ T8483] bdi_put+0x22/0xa0 [ 87.170879][ T8483] bdev_evict_inode+0x262/0x460 [ 87.175755][ T8483] ? __blkdev_direct_IO_simple+0x930/0x930 [ 87.181585][ T8483] evict+0x2ed/0x6b0 [ 87.185519][ T8483] iput.part.0+0x57e/0x810 [ 87.189970][ T8483] ? find_inode_nowait+0x190/0x190 [ 87.195280][ T8483] iput+0x58/0x70 [ 87.198933][ T8483] dentry_unlink_inode+0x2b1/0x3d0 [ 87.204163][ T8483] __dentry_kill+0x3c0/0x640 [ 87.208794][ T8483] ? dput+0x35/0xbc0 [ 87.212704][ T8483] ? dput+0x35/0xbc0 [ 87.216609][ T8483] dput+0x725/0xbc0 [ 87.220421][ T8483] shrink_dcache_for_umount+0x11f/0x330 [ 87.225967][ T8483] ? lockdep_hardirqs_on+0x79/0x100 [ 87.231193][ T8483] generic_shutdown_super+0x68/0x370 [ 87.236490][ T8483] kill_anon_super+0x36/0x60 [ 87.241094][ T8483] deactivate_locked_super+0x94/0x160 [ 87.246474][ T8483] deactivate_super+0xad/0xd0 [ 87.251162][ T8483] put_fs_context+0xaa/0x650 [ 87.255764][ T8483] ? __sanitizer_cov_trace_const_cmp2+0x22/0x80 [ 87.262007][ T8483] fscontext_release+0x4c/0x60 [ 87.266774][ T8483] __fput+0x283/0x920 [ 87.270764][ T8483] ? fs_validate_description+0x1d0/0x1d0 [ 87.276851][ T8483] task_work_run+0xdd/0x190 [ 87.281376][ T8483] do_exit+0xc5c/0x2ae0 [ 87.285546][ T8483] ? rcu_read_lock_sched_held+0x3a/0x70 [ 87.291108][ T8483] ? mm_update_next_owner+0x7a0/0x7a0 [ 87.296493][ T8483] ? __do_sys_fsconfig+0x1c2/0xbd0 [ 87.301619][ T8483] ? fscontext_read+0x310/0x310 [ 87.306494][ T8483] do_group_exit+0x125/0x310 [ 87.311118][ T8483] __x64_sys_exit_group+0x3a/0x50 [ 87.316149][ T8483] do_syscall_64+0x2d/0x70 [ 87.320595][ T8483] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 87.326501][ T8483] RIP: 0033:0x43ee78 [ 87.330408][ T8483] Code: Unable to access opcode bytes at RIP 0x43ee4e. [ 87.337776][ T8483] RSP: 002b:00007ffd260b0198 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 87.346195][ T8483] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ee78 [ 87.354437][ T8483] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 87.362415][ T8483] RBP: 00000000004be688 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 87.370410][ T8483] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 87.378398][ T8483] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 87.386405][ T8483] ================================================================== [ 87.394465][ T8483] Disabling lock debugging due to kernel taint [ 87.402650][ T8483] Kernel panic - not syncing: panic_on_warn set ... [ 87.409296][ T8483] CPU: 0 PID: 8483 Comm: syz-executor152 Tainted: G B 5.11.0-rc1-syzkaller #0 [ 87.419463][ T8483] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 87.429541][ T8483] Call Trace: [ 87.432826][ T8483] dump_stack+0x107/0x163 [ 87.437180][ T8483] ? bdi_alloc+0xf0/0x140 [ 87.441504][ T8483] panic+0x306/0x73d [ 87.445431][ T8483] ? __warn_printk+0xf3/0xf3 [ 87.450113][ T8483] ? preempt_schedule_common+0x59/0xc0 [ 87.455587][ T8483] ? bdi_put+0x22/0xa0 [ 87.459646][ T8483] ? preempt_schedule_thunk+0x16/0x18 [ 87.465028][ T8483] ? trace_hardirqs_on+0x38/0x1c0 [ 87.470063][ T8483] ? trace_hardirqs_on+0x51/0x1c0 [ 87.475091][ T8483] ? bdi_put+0x22/0xa0 [ 87.479168][ T8483] ? bdi_put+0x22/0xa0 [ 87.483253][ T8483] end_report+0x58/0x5e [ 87.487471][ T8483] kasan_report.cold+0x67/0xd5 [ 87.492247][ T8483] ? bdi_put+0x22/0xa0 [ 87.496322][ T8483] check_memory_region+0x13d/0x180 [ 87.501438][ T8483] bdi_put+0x22/0xa0 [ 87.505323][ T8483] bdev_evict_inode+0x262/0x460 [ 87.510194][ T8483] ? __blkdev_direct_IO_simple+0x930/0x930 [ 87.516008][ T8483] evict+0x2ed/0x6b0 [ 87.519917][ T8483] iput.part.0+0x57e/0x810 [ 87.524336][ T8483] ? find_inode_nowait+0x190/0x190 [ 87.529440][ T8483] iput+0x58/0x70 [ 87.533115][ T8483] dentry_unlink_inode+0x2b1/0x3d0 [ 87.538243][ T8483] __dentry_kill+0x3c0/0x640 [ 87.542833][ T8483] ? dput+0x35/0xbc0 [ 87.546736][ T8483] ? dput+0x35/0xbc0 [ 87.550626][ T8483] dput+0x725/0xbc0 [ 87.554450][ T8483] shrink_dcache_for_umount+0x11f/0x330 [ 87.560004][ T8483] ? lockdep_hardirqs_on+0x79/0x100 [ 87.565207][ T8483] generic_shutdown_super+0x68/0x370 [ 87.570513][ T8483] kill_anon_super+0x36/0x60 [ 87.575111][ T8483] deactivate_locked_super+0x94/0x160 [ 87.580478][ T8483] deactivate_super+0xad/0xd0 [ 87.585151][ T8483] put_fs_context+0xaa/0x650 [ 87.589734][ T8483] ? __sanitizer_cov_trace_const_cmp2+0x22/0x80 [ 87.595972][ T8483] fscontext_release+0x4c/0x60 [ 87.600731][ T8483] __fput+0x283/0x920 [ 87.604772][ T8483] ? fs_validate_description+0x1d0/0x1d0 [ 87.610447][ T8483] task_work_run+0xdd/0x190 [ 87.614983][ T8483] do_exit+0xc5c/0x2ae0 [ 87.619136][ T8483] ? rcu_read_lock_sched_held+0x3a/0x70 [ 87.625631][ T8483] ? mm_update_next_owner+0x7a0/0x7a0 [ 87.630990][ T8483] ? __do_sys_fsconfig+0x1c2/0xbd0 [ 87.636109][ T8483] ? fscontext_read+0x310/0x310 [ 87.640948][ T8483] do_group_exit+0x125/0x310 [ 87.645534][ T8483] __x64_sys_exit_group+0x3a/0x50 [ 87.650542][ T8483] do_syscall_64+0x2d/0x70 [ 87.654959][ T8483] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 87.660854][ T8483] RIP: 0033:0x43ee78 [ 87.664741][ T8483] Code: Unable to access opcode bytes at RIP 0x43ee4e. [ 87.671648][ T8483] RSP: 002b:00007ffd260b0198 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 87.680148][ T8483] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ee78 [ 87.688122][ T8483] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 87.696223][ T8483] RBP: 00000000004be688 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 87.704315][ T8483] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 87.712278][ T8483] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 87.720746][ T8483] Kernel Offset: disabled [ 87.725079][ T8483] Rebooting in 86400 seconds..