[ 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 '10.128.10.8' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 57.589260][ T8506] ================================================================== [ 57.598738][ T8506] BUG: KASAN: null-ptr-deref in bdi_put+0x22/0xa0 [ 57.605649][ T8506] Write of size 4 at addr 0000000000000040 by task syz-executor624/8506 [ 57.614241][ T8506] [ 57.616548][ T8506] CPU: 1 PID: 8506 Comm: syz-executor624 Not tainted 5.11.0-rc1-syzkaller #0 [ 57.625832][ T8506] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.636363][ T8506] Call Trace: [ 57.639636][ T8506] dump_stack+0x107/0x163 [ 57.644219][ T8506] ? bdi_put+0x22/0xa0 [ 57.648276][ T8506] ? bdi_put+0x22/0xa0 [ 57.652329][ T8506] kasan_report.cold+0x5f/0xd5 [ 57.657085][ T8506] ? bdi_put+0x22/0xa0 [ 57.661139][ T8506] check_memory_region+0x13d/0x180 [ 57.666242][ T8506] bdi_put+0x22/0xa0 [ 57.670193][ T8506] bdev_evict_inode+0x262/0x460 [ 57.675049][ T8506] ? __blkdev_direct_IO_simple+0x930/0x930 [ 57.681028][ T8506] evict+0x2ed/0x6b0 [ 57.684940][ T8506] iput.part.0+0x57e/0x810 [ 57.689360][ T8506] ? find_inode_nowait+0x190/0x190 [ 57.694462][ T8506] iput+0x58/0x70 [ 57.698083][ T8506] dentry_unlink_inode+0x2b1/0x3d0 [ 57.703177][ T8506] __dentry_kill+0x3c0/0x640 [ 57.707764][ T8506] ? dput+0x35/0xbc0 [ 57.711651][ T8506] ? dput+0x35/0xbc0 [ 57.715530][ T8506] dput+0x725/0xbc0 [ 57.719328][ T8506] shrink_dcache_for_umount+0x11f/0x330 [ 57.724868][ T8506] generic_shutdown_super+0x68/0x370 [ 57.730151][ T8506] kill_anon_super+0x36/0x60 [ 57.734996][ T8506] deactivate_locked_super+0x94/0x160 [ 57.740435][ T8506] deactivate_super+0xad/0xd0 [ 57.745112][ T8506] cleanup_mnt+0x3a3/0x530 [ 57.749526][ T8506] task_work_run+0xdd/0x190 [ 57.754030][ T8506] exit_to_user_mode_prepare+0x249/0x250 [ 57.759665][ T8506] syscall_exit_to_user_mode+0x19/0x50 [ 57.765147][ T8506] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 57.771025][ T8506] RIP: 0033:0x440219 [ 57.774898][ T8506] 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 [ 57.794495][ T8506] RSP: 002b:00007ffd0b356ed8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 57.802917][ T8506] RAX: ffffffffffffffea RBX: 0030656c69662f2e RCX: 0000000000440219 [ 57.810891][ T8506] RDX: 00000000200001c0 RSI: 0000000020000300 RDI: 0000000000000000 [ 57.818857][ T8506] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 57.826829][ T8506] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a20 [ 57.834899][ T8506] R13: 0000000000401ab0 R14: 0000000000000000 R15: 0000000000000000 [ 57.842864][ T8506] ================================================================== [ 57.850901][ T8506] Disabling lock debugging due to kernel taint [ 57.857378][ T8506] Kernel panic - not syncing: panic_on_warn set ... [ 57.863973][ T8506] CPU: 1 PID: 8506 Comm: syz-executor624 Tainted: G B 5.11.0-rc1-syzkaller #0 [ 57.874123][ T8506] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.884165][ T8506] Call Trace: [ 57.887441][ T8506] dump_stack+0x107/0x163 [ 57.891770][ T8506] ? bdi_alloc+0x90/0x140 [ 57.896085][ T8506] panic+0x306/0x73d [ 57.899970][ T8506] ? __warn_printk+0xf3/0xf3 [ 57.904540][ T8506] ? preempt_schedule_common+0x59/0xc0 [ 57.909983][ T8506] ? bdi_put+0x22/0xa0 [ 57.914033][ T8506] ? preempt_schedule_thunk+0x16/0x18 [ 57.919393][ T8506] ? trace_hardirqs_on+0x38/0x1c0 [ 57.924487][ T8506] ? trace_hardirqs_on+0x51/0x1c0 [ 57.929503][ T8506] ? bdi_put+0x22/0xa0 [ 57.933545][ T8506] ? bdi_put+0x22/0xa0 [ 57.937587][ T8506] end_report+0x58/0x5e [ 57.941719][ T8506] kasan_report.cold+0x67/0xd5 [ 57.946455][ T8506] ? bdi_put+0x22/0xa0 [ 57.950511][ T8506] check_memory_region+0x13d/0x180 [ 57.955599][ T8506] bdi_put+0x22/0xa0 [ 57.959468][ T8506] bdev_evict_inode+0x262/0x460 [ 57.964293][ T8506] ? __blkdev_direct_IO_simple+0x930/0x930 [ 57.970082][ T8506] evict+0x2ed/0x6b0 [ 57.973959][ T8506] iput.part.0+0x57e/0x810 [ 57.978710][ T8506] ? find_inode_nowait+0x190/0x190 [ 57.984321][ T8506] iput+0x58/0x70 [ 57.987937][ T8506] dentry_unlink_inode+0x2b1/0x3d0 [ 57.993024][ T8506] __dentry_kill+0x3c0/0x640 [ 57.997590][ T8506] ? dput+0x35/0xbc0 [ 58.001470][ T8506] ? dput+0x35/0xbc0 [ 58.005339][ T8506] dput+0x725/0xbc0 [ 58.009132][ T8506] shrink_dcache_for_umount+0x11f/0x330 [ 58.019430][ T8506] generic_shutdown_super+0x68/0x370 [ 58.024697][ T8506] kill_anon_super+0x36/0x60 [ 58.029281][ T8506] deactivate_locked_super+0x94/0x160 [ 58.034629][ T8506] deactivate_super+0xad/0xd0 [ 58.039286][ T8506] cleanup_mnt+0x3a3/0x530 [ 58.043680][ T8506] task_work_run+0xdd/0x190 [ 58.048164][ T8506] exit_to_user_mode_prepare+0x249/0x250 [ 58.053789][ T8506] syscall_exit_to_user_mode+0x19/0x50 [ 58.059239][ T8506] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 58.065109][ T8506] RIP: 0033:0x440219 [ 58.068977][ T8506] 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 [ 58.088568][ T8506] RSP: 002b:00007ffd0b356ed8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 [ 58.096969][ T8506] RAX: ffffffffffffffea RBX: 0030656c69662f2e RCX: 0000000000440219 [ 58.105006][ T8506] RDX: 00000000200001c0 RSI: 0000000020000300 RDI: 0000000000000000 [ 58.112965][ T8506] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 58.120930][ T8506] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a20 [ 58.128891][ T8506] R13: 0000000000401ab0 R14: 0000000000000000 R15: 0000000000000000 [ 58.140846][ T8506] Kernel Offset: disabled [ 58.145208][ T8506] Rebooting in 86400 seconds..