[ 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 '10.128.10.26' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 74.966297][ T8529] ================================================================== [ 74.974730][ T8529] BUG: KASAN: null-ptr-deref in bdi_put+0x22/0xa0 [ 74.981196][ T8529] Write of size 4 at addr 0000000000000040 by task syz-executor821/8529 [ 74.989757][ T8529] [ 74.992075][ T8529] CPU: 1 PID: 8529 Comm: syz-executor821 Not tainted 5.10.0-rc7-next-20201210-syzkaller #0 [ 75.002047][ T8529] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 75.012476][ T8529] Call Trace: [ 75.015768][ T8529] dump_stack+0x107/0x163 [ 75.020230][ T8529] ? bdi_put+0x22/0xa0 [ 75.024306][ T8529] ? bdi_put+0x22/0xa0 [ 75.028396][ T8529] kasan_report.cold+0x5f/0xd5 [ 75.034139][ T8529] ? bdi_put+0x22/0xa0 [ 75.038377][ T8529] check_memory_region+0x13d/0x180 [ 75.043764][ T8529] bdi_put+0x22/0xa0 [ 75.047661][ T8529] bdev_evict_inode+0x280/0x4a0 [ 75.052613][ T8529] ? __blkdev_direct_IO_simple+0x930/0x930 [ 75.058456][ T8529] evict+0x2ed/0x6b0 [ 75.062474][ T8529] iput.part.0+0x41e/0x840 [ 75.066998][ T8529] ? __remove_inode_hash+0x130/0x130 [ 75.072297][ T8529] iput+0x58/0x70 [ 75.075949][ T8529] dentry_unlink_inode+0x2b1/0x3d0 [ 75.081056][ T8529] __dentry_kill+0x3c0/0x640 [ 75.085739][ T8529] ? dput+0x35/0xc10 [ 75.089635][ T8529] ? dput+0x35/0xc10 [ 75.093684][ T8529] dput+0x786/0xc10 [ 75.097493][ T8529] shrink_dcache_for_umount+0x11f/0x330 [ 75.103291][ T8529] generic_shutdown_super+0x68/0x370 [ 75.109456][ T8529] kill_anon_super+0x36/0x60 [ 75.114081][ T8529] deactivate_locked_super+0x94/0x160 [ 75.119883][ T8529] deactivate_super+0xad/0xd0 [ 75.124653][ T8529] put_fs_context+0xaa/0x650 [ 75.129506][ T8529] ? __sanitizer_cov_trace_const_cmp2+0x22/0x80 [ 75.136197][ T8529] fscontext_release+0x4c/0x60 [ 75.140950][ T8529] __fput+0x283/0x920 [ 75.144923][ T8529] ? fs_validate_description+0x1d0/0x1d0 [ 75.151056][ T8529] task_work_run+0xdd/0x190 [ 75.155828][ T8529] do_exit+0xb89/0x2a00 [ 75.160022][ T8529] ? kfree+0x2f9/0x3c0 [ 75.164284][ T8529] ? mm_update_next_owner+0x7a0/0x7a0 [ 75.169660][ T8529] ? __do_sys_fsconfig+0x1c2/0xbd0 [ 75.174869][ T8529] ? fscontext_read+0x310/0x310 [ 75.179923][ T8529] do_group_exit+0x125/0x310 [ 75.184506][ T8529] __x64_sys_exit_group+0x3a/0x50 [ 75.189535][ T8529] do_syscall_64+0x2d/0x70 [ 75.194013][ T8529] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 75.200042][ T8529] RIP: 0033:0x43ee78 [ 75.204028][ T8529] Code: Unable to access opcode bytes at RIP 0x43ee4e. [ 75.211993][ T8529] RSP: 002b:00007ffc60d66bd8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 75.220481][ T8529] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ee78 [ 75.229533][ T8529] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 75.238373][ T8529] RBP: 00000000004be688 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 75.246437][ T8529] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 75.254430][ T8529] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 75.262784][ T8529] ================================================================== [ 75.270916][ T8529] Disabling lock debugging due to kernel taint [ 75.278623][ T8529] Kernel panic - not syncing: panic_on_warn set ... [ 75.285241][ T8529] CPU: 0 PID: 8529 Comm: syz-executor821 Tainted: G B 5.10.0-rc7-next-20201210-syzkaller #0 [ 75.296727][ T8529] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 75.306971][ T8529] Call Trace: [ 75.310239][ T8529] dump_stack+0x107/0x163 [ 75.314971][ T8529] panic+0x343/0x77f [ 75.318852][ T8529] ? __warn_printk+0xf3/0xf3 [ 75.323712][ T8529] ? preempt_schedule_common+0x59/0xc0 [ 75.329178][ T8529] ? bdi_put+0x22/0xa0 [ 75.333582][ T8529] ? preempt_schedule_thunk+0x16/0x18 [ 75.338941][ T8529] ? trace_hardirqs_on+0x38/0x1c0 [ 75.343965][ T8529] ? trace_hardirqs_on+0x51/0x1c0 [ 75.348978][ T8529] ? bdi_put+0x22/0xa0 [ 75.353052][ T8529] ? bdi_put+0x22/0xa0 [ 75.357109][ T8529] end_report+0x58/0x5e [ 75.361271][ T8529] kasan_report.cold+0x67/0xd5 [ 75.366021][ T8529] ? bdi_put+0x22/0xa0 [ 75.370076][ T8529] check_memory_region+0x13d/0x180 [ 75.375236][ T8529] bdi_put+0x22/0xa0 [ 75.379134][ T8529] bdev_evict_inode+0x280/0x4a0 [ 75.384111][ T8529] ? __blkdev_direct_IO_simple+0x930/0x930 [ 75.390137][ T8529] evict+0x2ed/0x6b0 [ 75.394034][ T8529] iput.part.0+0x41e/0x840 [ 75.398441][ T8529] ? __remove_inode_hash+0x130/0x130 [ 75.403722][ T8529] iput+0x58/0x70 [ 75.407973][ T8529] dentry_unlink_inode+0x2b1/0x3d0 [ 75.413086][ T8529] __dentry_kill+0x3c0/0x640 [ 75.417673][ T8529] ? dput+0x35/0xc10 [ 75.421554][ T8529] ? dput+0x35/0xc10 [ 75.425435][ T8529] dput+0x786/0xc10 [ 75.429232][ T8529] shrink_dcache_for_umount+0x11f/0x330 [ 75.434787][ T8529] generic_shutdown_super+0x68/0x370 [ 75.440068][ T8529] kill_anon_super+0x36/0x60 [ 75.444814][ T8529] deactivate_locked_super+0x94/0x160 [ 75.451014][ T8529] deactivate_super+0xad/0xd0 [ 75.455693][ T8529] put_fs_context+0xaa/0x650 [ 75.460392][ T8529] ? __sanitizer_cov_trace_const_cmp2+0x22/0x80 [ 75.466682][ T8529] fscontext_release+0x4c/0x60 [ 75.471486][ T8529] __fput+0x283/0x920 [ 75.475629][ T8529] ? fs_validate_description+0x1d0/0x1d0 [ 75.481250][ T8529] task_work_run+0xdd/0x190 [ 75.485739][ T8529] do_exit+0xb89/0x2a00 [ 75.489898][ T8529] ? kfree+0x2f9/0x3c0 [ 75.493972][ T8529] ? mm_update_next_owner+0x7a0/0x7a0 [ 75.501448][ T8529] ? __do_sys_fsconfig+0x1c2/0xbd0 [ 75.506550][ T8529] ? fscontext_read+0x310/0x310 [ 75.511407][ T8529] do_group_exit+0x125/0x310 [ 75.515994][ T8529] __x64_sys_exit_group+0x3a/0x50 [ 75.521010][ T8529] do_syscall_64+0x2d/0x70 [ 75.525541][ T8529] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 75.531426][ T8529] RIP: 0033:0x43ee78 [ 75.535308][ T8529] Code: Unable to access opcode bytes at RIP 0x43ee4e. [ 75.542147][ T8529] RSP: 002b:00007ffc60d66bd8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 75.550545][ T8529] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ee78 [ 75.558527][ T8529] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 75.567546][ T8529] RBP: 00000000004be688 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 75.578979][ T8529] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 75.586946][ T8529] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 75.595978][ T8529] Kernel Offset: disabled [ 75.600395][ T8529] Rebooting in 86400 seconds..