[ 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. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.226' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 66.921799][ T8462] ================================================================== [ 66.930022][ T8462] BUG: KASAN: null-ptr-deref in bdi_put+0x22/0xa0 [ 66.936439][ T8462] Write of size 4 at addr 0000000000000040 by task syz-executor964/8462 [ 66.944742][ T8462] [ 66.947045][ T8462] CPU: 1 PID: 8462 Comm: syz-executor964 Not tainted 5.10.0-next-20201223-syzkaller #0 [ 66.956662][ T8462] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.966721][ T8462] Call Trace: [ 66.969982][ T8462] dump_stack+0x107/0x163 [ 66.974300][ T8462] ? bdi_put+0x22/0xa0 [ 66.978349][ T8462] ? bdi_put+0x22/0xa0 [ 66.982395][ T8462] kasan_report.cold+0x5f/0xd5 [ 66.987145][ T8462] ? bdi_put+0x22/0xa0 [ 66.991215][ T8462] check_memory_region+0x13d/0x180 [ 66.996316][ T8462] bdi_put+0x22/0xa0 [ 67.000194][ T8462] bdev_evict_inode+0x262/0x460 [ 67.005030][ T8462] ? __blkdev_direct_IO_simple+0x930/0x930 [ 67.010826][ T8462] evict+0x2ed/0x6b0 [ 67.014707][ T8462] iput.part.0+0x57e/0x810 [ 67.019105][ T8462] ? find_inode_nowait+0x190/0x190 [ 67.024208][ T8462] iput+0x58/0x70 [ 67.027837][ T8462] dentry_unlink_inode+0x2b1/0x3d0 [ 67.032934][ T8462] __dentry_kill+0x3c0/0x640 [ 67.037518][ T8462] ? dput+0x35/0xbc0 [ 67.041403][ T8462] ? dput+0x35/0xbc0 [ 67.045295][ T8462] dput+0x725/0xbc0 [ 67.049102][ T8462] shrink_dcache_for_umount+0x11f/0x330 [ 67.054689][ T8462] generic_shutdown_super+0x68/0x370 [ 67.059971][ T8462] kill_anon_super+0x36/0x60 [ 67.064566][ T8462] deactivate_locked_super+0x94/0x160 [ 67.069930][ T8462] deactivate_super+0xad/0xd0 [ 67.074599][ T8462] cleanup_mnt+0x3a3/0x530 [ 67.079015][ T8462] task_work_run+0xdd/0x190 [ 67.083514][ T8462] exit_to_user_mode_prepare+0x249/0x250 [ 67.089136][ T8462] syscall_exit_to_user_mode+0x19/0x50 [ 67.094595][ T8462] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 67.100477][ T8462] RIP: 0033:0x440219 [ 67.104358][ T8462] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 7b 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 67.123952][ T8462] RSP: 002b:00007ffc6cfb8928 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 67.132351][ T8462] RAX: ffffffffffffffea RBX: 0030656c69662f2e RCX: 0000000000440219 [ 67.140315][ T8462] RDX: 00000000200001c0 RSI: 0000000020000300 RDI: 0000000000000000 [ 67.148269][ T8462] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 67.156220][ T8462] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a20 [ 67.164200][ T8462] R13: 0000000000401ab0 R14: 0000000000000000 R15: 0000000000000000 [ 67.172183][ T8462] ================================================================== [ 67.180220][ T8462] Disabling lock debugging due to kernel taint [ 67.188264][ T8462] Kernel panic - not syncing: panic_on_warn set ... [ 67.194863][ T8462] CPU: 0 PID: 8462 Comm: syz-executor964 Tainted: G B 5.10.0-next-20201223-syzkaller #0 [ 67.205881][ T8462] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 67.215913][ T8462] Call Trace: [ 67.219175][ T8462] dump_stack+0x107/0x163 [ 67.223490][ T8462] ? bdi_alloc+0xd0/0x140 [ 67.227797][ T8462] panic+0x306/0x73d [ 67.231687][ T8462] ? __warn_printk+0xf3/0xf3 [ 67.236272][ T8462] ? preempt_schedule_common+0x59/0xc0 [ 67.241733][ T8462] ? bdi_put+0x22/0xa0 [ 67.245792][ T8462] ? preempt_schedule_thunk+0x16/0x18 [ 67.251143][ T8462] ? trace_hardirqs_on+0x38/0x1c0 [ 67.256165][ T8462] ? trace_hardirqs_on+0x51/0x1c0 [ 67.261234][ T8462] ? bdi_put+0x22/0xa0 [ 67.265394][ T8462] ? bdi_put+0x22/0xa0 [ 67.269447][ T8462] end_report+0x58/0x5e [ 67.273585][ T8462] kasan_report.cold+0x67/0xd5 [ 67.278356][ T8462] ? bdi_put+0x22/0xa0 [ 67.282404][ T8462] check_memory_region+0x13d/0x180 [ 67.287494][ T8462] bdi_put+0x22/0xa0 [ 67.291367][ T8462] bdev_evict_inode+0x262/0x460 [ 67.296200][ T8462] ? __blkdev_direct_IO_simple+0x930/0x930 [ 67.301986][ T8462] evict+0x2ed/0x6b0 [ 67.305869][ T8462] iput.part.0+0x57e/0x810 [ 67.310265][ T8462] ? find_inode_nowait+0x190/0x190 [ 67.315366][ T8462] iput+0x58/0x70 [ 67.318981][ T8462] dentry_unlink_inode+0x2b1/0x3d0 [ 67.324076][ T8462] __dentry_kill+0x3c0/0x640 [ 67.328644][ T8462] ? dput+0x35/0xbc0 [ 67.332519][ T8462] ? dput+0x35/0xbc0 [ 67.336406][ T8462] dput+0x725/0xbc0 [ 67.340211][ T8462] shrink_dcache_for_umount+0x11f/0x330 [ 67.345739][ T8462] generic_shutdown_super+0x68/0x370 [ 67.351008][ T8462] kill_anon_super+0x36/0x60 [ 67.355592][ T8462] deactivate_locked_super+0x94/0x160 [ 67.360956][ T8462] deactivate_super+0xad/0xd0 [ 67.365612][ T8462] cleanup_mnt+0x3a3/0x530 [ 67.370017][ T8462] task_work_run+0xdd/0x190 [ 67.374505][ T8462] exit_to_user_mode_prepare+0x249/0x250 [ 67.380117][ T8462] syscall_exit_to_user_mode+0x19/0x50 [ 67.385577][ T8462] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 67.391455][ T8462] RIP: 0033:0x440219 [ 67.395338][ T8462] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 7b 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 67.414934][ T8462] RSP: 002b:00007ffc6cfb8928 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 67.423332][ T8462] RAX: ffffffffffffffea RBX: 0030656c69662f2e RCX: 0000000000440219 [ 67.431566][ T8462] RDX: 00000000200001c0 RSI: 0000000020000300 RDI: 0000000000000000 [ 67.439518][ T8462] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 67.447471][ T8462] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a20 [ 67.455464][ T8462] R13: 0000000000401ab0 R14: 0000000000000000 R15: 0000000000000000 [ 67.463834][ T8462] Kernel Offset: disabled [ 67.468151][ T8462] Rebooting in 86400 seconds..