[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.182' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 59.252378][ T8467] ================================================================== [ 59.261314][ T8467] BUG: KASAN: null-ptr-deref in bdi_put+0x22/0xa0 [ 59.267752][ T8467] Write of size 4 at addr 0000000000000040 by task syz-executor948/8467 [ 59.276413][ T8467] [ 59.278729][ T8467] CPU: 0 PID: 8467 Comm: syz-executor948 Not tainted 5.11.0-rc1-syzkaller #0 [ 59.287618][ T8467] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.298008][ T8467] Call Trace: [ 59.301295][ T8467] dump_stack+0x107/0x163 [ 59.305859][ T8467] ? bdi_put+0x22/0xa0 [ 59.309942][ T8467] ? bdi_put+0x22/0xa0 [ 59.314005][ T8467] kasan_report.cold+0x5f/0xd5 [ 59.318947][ T8467] ? bdi_put+0x22/0xa0 [ 59.323124][ T8467] check_memory_region+0x13d/0x180 [ 59.328231][ T8467] bdi_put+0x22/0xa0 [ 59.332124][ T8467] bdev_evict_inode+0x262/0x460 [ 59.336992][ T8467] ? __blkdev_direct_IO_simple+0x930/0x930 [ 59.342804][ T8467] evict+0x2ed/0x6b0 [ 59.346701][ T8467] iput.part.0+0x57e/0x810 [ 59.351107][ T8467] ? find_inode_nowait+0x190/0x190 [ 59.356223][ T8467] iput+0x58/0x70 [ 59.359855][ T8467] dentry_unlink_inode+0x2b1/0x3d0 [ 59.364991][ T8467] __dentry_kill+0x3c0/0x640 [ 59.369575][ T8467] ? dput+0x35/0xbc0 [ 59.373465][ T8467] ? dput+0x35/0xbc0 [ 59.377355][ T8467] dput+0x725/0xbc0 [ 59.381172][ T8467] shrink_dcache_for_umount+0x11f/0x330 [ 59.386899][ T8467] generic_shutdown_super+0x68/0x370 [ 59.392180][ T8467] kill_anon_super+0x36/0x60 [ 59.396952][ T8467] deactivate_locked_super+0x94/0x160 [ 59.402370][ T8467] deactivate_super+0xad/0xd0 [ 59.407064][ T8467] put_fs_context+0xaa/0x650 [ 59.411668][ T8467] ? __sanitizer_cov_trace_const_cmp2+0x22/0x80 [ 59.418098][ T8467] fscontext_release+0x4c/0x60 [ 59.422937][ T8467] __fput+0x283/0x920 [ 59.426971][ T8467] ? fs_validate_description+0x1d0/0x1d0 [ 59.432613][ T8467] task_work_run+0xdd/0x190 [ 59.437142][ T8467] do_exit+0xb89/0x29e0 [ 59.441385][ T8467] ? kfree+0x2d3/0x360 [ 59.445552][ T8467] ? mm_update_next_owner+0x7a0/0x7a0 [ 59.450965][ T8467] ? __do_sys_fsconfig+0x1c2/0xbd0 [ 59.456089][ T8467] ? fscontext_read+0x310/0x310 [ 59.460980][ T8467] do_group_exit+0x125/0x310 [ 59.465668][ T8467] __x64_sys_exit_group+0x3a/0x50 [ 59.470710][ T8467] do_syscall_64+0x2d/0x70 [ 59.475151][ T8467] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 59.481069][ T8467] RIP: 0033:0x43ee78 [ 59.484991][ T8467] Code: Unable to access opcode bytes at RIP 0x43ee4e. [ 59.491863][ T8467] RSP: 002b:00007ffd103e9508 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 59.500313][ T8467] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ee78 [ 59.508295][ T8467] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 59.516314][ T8467] RBP: 00000000004be688 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 59.524288][ T8467] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 59.532457][ T8467] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 59.540674][ T8467] ================================================================== [ 59.548739][ T8467] Disabling lock debugging due to kernel taint [ 59.556088][ T8467] Kernel panic - not syncing: panic_on_warn set ... [ 59.563279][ T8467] CPU: 1 PID: 8467 Comm: syz-executor948 Tainted: G B 5.11.0-rc1-syzkaller #0 [ 59.573829][ T8467] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.584121][ T8467] Call Trace: [ 59.587484][ T8467] dump_stack+0x107/0x163 [ 59.591968][ T8467] ? bdi_alloc+0x90/0x140 [ 59.596311][ T8467] panic+0x306/0x73d [ 59.600347][ T8467] ? __warn_printk+0xf3/0xf3 [ 59.605315][ T8467] ? preempt_schedule_common+0x59/0xc0 [ 59.610898][ T8467] ? bdi_put+0x22/0xa0 [ 59.615217][ T8467] ? preempt_schedule_thunk+0x16/0x18 [ 59.620591][ T8467] ? trace_hardirqs_on+0x38/0x1c0 [ 59.625614][ T8467] ? trace_hardirqs_on+0x51/0x1c0 [ 59.630636][ T8467] ? bdi_put+0x22/0xa0 [ 59.634689][ T8467] ? bdi_put+0x22/0xa0 [ 59.638745][ T8467] end_report+0x58/0x5e [ 59.642894][ T8467] kasan_report.cold+0x67/0xd5 [ 59.647688][ T8467] ? bdi_put+0x22/0xa0 [ 59.652105][ T8467] check_memory_region+0x13d/0x180 [ 59.657380][ T8467] bdi_put+0x22/0xa0 [ 59.661313][ T8467] bdev_evict_inode+0x262/0x460 [ 59.666289][ T8467] ? __blkdev_direct_IO_simple+0x930/0x930 [ 59.672123][ T8467] evict+0x2ed/0x6b0 [ 59.676021][ T8467] iput.part.0+0x57e/0x810 [ 59.680552][ T8467] ? find_inode_nowait+0x190/0x190 [ 59.685691][ T8467] iput+0x58/0x70 [ 59.689661][ T8467] dentry_unlink_inode+0x2b1/0x3d0 [ 59.694790][ T8467] __dentry_kill+0x3c0/0x640 [ 59.699409][ T8467] ? dput+0x35/0xbc0 [ 59.703291][ T8467] ? dput+0x35/0xbc0 [ 59.707169][ T8467] dput+0x725/0xbc0 [ 59.710967][ T8467] shrink_dcache_for_umount+0x11f/0x330 [ 59.716505][ T8467] generic_shutdown_super+0x68/0x370 [ 59.721783][ T8467] kill_anon_super+0x36/0x60 [ 59.726395][ T8467] deactivate_locked_super+0x94/0x160 [ 59.731967][ T8467] deactivate_super+0xad/0xd0 [ 59.736664][ T8467] put_fs_context+0xaa/0x650 [ 59.741240][ T8467] ? __sanitizer_cov_trace_const_cmp2+0x22/0x80 [ 59.747511][ T8467] fscontext_release+0x4c/0x60 [ 59.752265][ T8467] __fput+0x283/0x920 [ 59.756231][ T8467] ? fs_validate_description+0x1d0/0x1d0 [ 59.761852][ T8467] task_work_run+0xdd/0x190 [ 59.766352][ T8467] do_exit+0xb89/0x29e0 [ 59.770505][ T8467] ? kfree+0x2d3/0x360 [ 59.774596][ T8467] ? mm_update_next_owner+0x7a0/0x7a0 [ 59.779988][ T8467] ? __do_sys_fsconfig+0x1c2/0xbd0 [ 59.785093][ T8467] ? fscontext_read+0x310/0x310 [ 59.790405][ T8467] do_group_exit+0x125/0x310 [ 59.795332][ T8467] __x64_sys_exit_group+0x3a/0x50 [ 59.800756][ T8467] do_syscall_64+0x2d/0x70 [ 59.805176][ T8467] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 59.811073][ T8467] RIP: 0033:0x43ee78 [ 59.815773][ T8467] Code: Unable to access opcode bytes at RIP 0x43ee4e. [ 59.823548][ T8467] RSP: 002b:00007ffd103e9508 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 59.832619][ T8467] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ee78 [ 59.840863][ T8467] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 59.849133][ T8467] RBP: 00000000004be688 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 59.857105][ T8467] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 59.865157][ T8467] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 59.876966][ T8467] Kernel Offset: disabled [ 59.881336][ T8467] Rebooting in 86400 seconds..