[ 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 '10.128.0.144' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 72.744713][ T8495] ================================================================== [ 72.752958][ T8495] BUG: KASAN: null-ptr-deref in bdi_put+0x22/0xa0 [ 72.759427][ T8495] Write of size 4 at addr 0000000000000040 by task syz-executor728/8495 [ 72.768074][ T8495] [ 72.770430][ T8495] CPU: 1 PID: 8495 Comm: syz-executor728 Not tainted 5.11.0-rc2-next-20210108-syzkaller #0 [ 72.780423][ T8495] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 72.790611][ T8495] Call Trace: [ 72.793913][ T8495] dump_stack+0x107/0x163 [ 72.798291][ T8495] ? bdi_put+0x22/0xa0 [ 72.802403][ T8495] ? bdi_put+0x22/0xa0 [ 72.806477][ T8495] kasan_report.cold+0x5f/0xd5 [ 72.811267][ T8495] ? bdi_put+0x22/0xa0 [ 72.815385][ T8495] check_memory_region+0x13d/0x180 [ 72.820533][ T8495] bdi_put+0x22/0xa0 [ 72.824440][ T8495] bdev_evict_inode+0x262/0x460 [ 72.829300][ T8495] ? __blkdev_direct_IO_simple+0x930/0x930 [ 72.835142][ T8495] evict+0x2ed/0x6b0 [ 72.839069][ T8495] iput.part.0+0x57e/0x810 [ 72.843492][ T8495] ? __remove_inode_hash+0x130/0x130 [ 72.848797][ T8495] iput+0x58/0x70 [ 72.852495][ T8495] dentry_unlink_inode+0x2b1/0x3d0 [ 72.857872][ T8495] __dentry_kill+0x3c0/0x640 [ 72.862478][ T8495] ? dput+0x35/0xbc0 [ 72.866382][ T8495] ? dput+0x35/0xbc0 [ 72.870283][ T8495] dput+0x725/0xbc0 [ 72.874120][ T8495] shrink_dcache_for_umount+0x11f/0x330 [ 72.879697][ T8495] generic_shutdown_super+0x68/0x370 [ 72.885167][ T8495] kill_anon_super+0x36/0x60 [ 72.889794][ T8495] deactivate_locked_super+0x94/0x160 [ 72.895365][ T8495] deactivate_super+0xad/0xd0 [ 72.900111][ T8495] cleanup_mnt+0x3a3/0x530 [ 72.904553][ T8495] task_work_run+0xdd/0x190 [ 72.909085][ T8495] exit_to_user_mode_prepare+0x249/0x250 [ 72.914734][ T8495] syscall_exit_to_user_mode+0x19/0x50 [ 72.920241][ T8495] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 72.926150][ T8495] RIP: 0033:0x444439 [ 72.930086][ T8495] 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 db d7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 72.950374][ T8495] RSP: 002b:00007ffe6bedf498 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 72.958803][ T8495] RAX: ffffffffffffffea RBX: 00007ffe6bedf4a0 RCX: 0000000000444439 [ 72.966806][ T8495] RDX: 0000000020000580 RSI: 00000000200001c0 RDI: 0000000000000000 [ 72.975001][ T8495] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000400c60 [ 72.983074][ T8495] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004020a0 [ 72.991068][ T8495] R13: 0000000000402130 R14: 0000000000000000 R15: 0000000000000000 [ 72.999107][ T8495] ================================================================== [ 73.007188][ T8495] Disabling lock debugging due to kernel taint [ 73.014062][ T8495] Kernel panic - not syncing: panic_on_warn set ... [ 73.020682][ T8495] CPU: 1 PID: 8495 Comm: syz-executor728 Tainted: G B 5.11.0-rc2-next-20210108-syzkaller #0 [ 73.032080][ T8495] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 73.042189][ T8495] Call Trace: [ 73.045492][ T8495] dump_stack+0x107/0x163 [ 73.049858][ T8495] ? bdi_alloc+0x140/0x140 [ 73.054317][ T8495] panic+0x306/0x73d [ 73.058244][ T8495] ? __warn_printk+0xf3/0xf3 [ 73.062862][ T8495] ? preempt_schedule_common+0x59/0xc0 [ 73.068355][ T8495] ? bdi_put+0x22/0xa0 [ 73.072447][ T8495] ? preempt_schedule_thunk+0x16/0x18 [ 73.077841][ T8495] ? trace_hardirqs_on+0x38/0x1c0 [ 73.082894][ T8495] ? trace_hardirqs_on+0x51/0x1c0 [ 73.087970][ T8495] ? bdi_put+0x22/0xa0 [ 73.092063][ T8495] ? bdi_put+0x22/0xa0 [ 73.096152][ T8495] end_report+0x58/0x5e [ 73.100343][ T8495] kasan_report.cold+0x67/0xd5 [ 73.105129][ T8495] ? bdi_put+0x22/0xa0 [ 73.109231][ T8495] check_memory_region+0x13d/0x180 [ 73.114378][ T8495] bdi_put+0x22/0xa0 [ 73.118304][ T8495] bdev_evict_inode+0x262/0x460 [ 73.123195][ T8495] ? __blkdev_direct_IO_simple+0x930/0x930 [ 73.129053][ T8495] evict+0x2ed/0x6b0 [ 73.132980][ T8495] iput.part.0+0x57e/0x810 [ 73.137446][ T8495] ? __remove_inode_hash+0x130/0x130 [ 73.142761][ T8495] iput+0x58/0x70 [ 73.146441][ T8495] dentry_unlink_inode+0x2b1/0x3d0 [ 73.151589][ T8495] __dentry_kill+0x3c0/0x640 [ 73.156219][ T8495] ? dput+0x35/0xbc0 [ 73.160161][ T8495] ? dput+0x35/0xbc0 [ 73.164077][ T8495] dput+0x725/0xbc0 [ 73.167908][ T8495] shrink_dcache_for_umount+0x11f/0x330 [ 73.173486][ T8495] generic_shutdown_super+0x68/0x370 [ 73.178810][ T8495] kill_anon_super+0x36/0x60 [ 73.183433][ T8495] deactivate_locked_super+0x94/0x160 [ 73.188840][ T8495] deactivate_super+0xad/0xd0 [ 73.193555][ T8495] cleanup_mnt+0x3a3/0x530 [ 73.198008][ T8495] task_work_run+0xdd/0x190 [ 73.202547][ T8495] exit_to_user_mode_prepare+0x249/0x250 [ 73.208212][ T8495] syscall_exit_to_user_mode+0x19/0x50 [ 73.214057][ T8495] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 73.219997][ T8495] RIP: 0033:0x444439 [ 73.223914][ T8495] 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 db d7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 73.243917][ T8495] RSP: 002b:00007ffe6bedf498 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 73.252365][ T8495] RAX: ffffffffffffffea RBX: 00007ffe6bedf4a0 RCX: 0000000000444439 [ 73.260366][ T8495] RDX: 0000000020000580 RSI: 00000000200001c0 RDI: 0000000000000000 [ 73.268364][ T8495] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000400c60 [ 73.276376][ T8495] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004020a0 [ 73.284373][ T8495] R13: 0000000000402130 R14: 0000000000000000 R15: 0000000000000000 [ 73.292867][ T8495] Kernel Offset: disabled [ 73.297351][ T8495] Rebooting in 86400 seconds..