Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.83' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 54.078459][ T8469] ================================================================== [ 54.086673][ T8469] BUG: KASAN: null-ptr-deref in bdi_put+0x22/0xa0 [ 54.093637][ T8469] Write of size 4 at addr 0000000000000040 by task syz-executor183/8469 [ 54.102309][ T8469] [ 54.104725][ T8469] CPU: 0 PID: 8469 Comm: syz-executor183 Not tainted 5.11.0-rc2-syzkaller #0 [ 54.113574][ T8469] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.123640][ T8469] Call Trace: [ 54.126927][ T8469] dump_stack+0x107/0x163 [ 54.131248][ T8469] ? bdi_put+0x22/0xa0 [ 54.135316][ T8469] ? bdi_put+0x22/0xa0 [ 54.139367][ T8469] kasan_report.cold+0x5f/0xd5 [ 54.144136][ T8469] ? bdi_put+0x22/0xa0 [ 54.148196][ T8469] check_memory_region+0x13d/0x180 [ 54.153311][ T8469] bdi_put+0x22/0xa0 [ 54.157218][ T8469] bdev_evict_inode+0x262/0x460 [ 54.162055][ T8469] ? __blkdev_direct_IO_simple+0x930/0x930 [ 54.167873][ T8469] evict+0x2ed/0x6b0 [ 54.171769][ T8469] iput.part.0+0x57e/0x810 [ 54.176190][ T8469] ? find_inode_nowait+0x190/0x190 [ 54.181326][ T8469] iput+0x58/0x70 [ 54.185123][ T8469] dentry_unlink_inode+0x2b1/0x3d0 [ 54.190248][ T8469] __dentry_kill+0x3c0/0x640 [ 54.194821][ T8469] ? dput+0x35/0xbc0 [ 54.198702][ T8469] ? dput+0x35/0xbc0 [ 54.203116][ T8469] dput+0x725/0xbc0 [ 54.206916][ T8469] shrink_dcache_for_umount+0x11f/0x330 [ 54.212542][ T8469] generic_shutdown_super+0x68/0x370 [ 54.217929][ T8469] kill_anon_super+0x36/0x60 [ 54.222517][ T8469] deactivate_locked_super+0x94/0x160 [ 54.227908][ T8469] deactivate_super+0xad/0xd0 [ 54.232594][ T8469] put_fs_context+0xaa/0x650 [ 54.237293][ T8469] ? __sanitizer_cov_trace_const_cmp2+0x22/0x80 [ 54.243520][ T8469] fscontext_release+0x4c/0x60 [ 54.248295][ T8469] __fput+0x283/0x920 [ 54.252293][ T8469] ? fs_validate_description+0x1d0/0x1d0 [ 54.257914][ T8469] task_work_run+0xdd/0x190 [ 54.262425][ T8469] do_exit+0xc5c/0x2ae0 [ 54.266566][ T8469] ? kfree+0x2d3/0x360 [ 54.270621][ T8469] ? mm_update_next_owner+0x7a0/0x7a0 [ 54.275990][ T8469] ? __do_sys_fsconfig+0x1c2/0xbd0 [ 54.281193][ T8469] ? fscontext_read+0x310/0x310 [ 54.286046][ T8469] do_group_exit+0x125/0x310 [ 54.290634][ T8469] __x64_sys_exit_group+0x3a/0x50 [ 54.295637][ T8469] do_syscall_64+0x2d/0x70 [ 54.300048][ T8469] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 54.305925][ T8469] RIP: 0033:0x43ee78 [ 54.309798][ T8469] Code: Unable to access opcode bytes at RIP 0x43ee4e. [ 54.316630][ T8469] RSP: 002b:00007ffcbc2effd8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 54.325037][ T8469] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ee78 [ 54.333008][ T8469] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 54.341056][ T8469] RBP: 00000000004be688 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 54.349004][ T8469] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 54.357040][ T8469] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 54.364999][ T8469] ================================================================== [ 54.373050][ T8469] Disabling lock debugging due to kernel taint [ 54.380616][ T8469] Kernel panic - not syncing: panic_on_warn set ... [ 54.387219][ T8469] CPU: 0 PID: 8469 Comm: syz-executor183 Tainted: G B 5.11.0-rc2-syzkaller #0 [ 54.397458][ T8469] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.407681][ T8469] Call Trace: [ 54.411205][ T8469] dump_stack+0x107/0x163 [ 54.416361][ T8469] ? bdi_alloc+0x90/0x140 [ 54.420674][ T8469] panic+0x306/0x73d [ 54.424548][ T8469] ? __warn_printk+0xf3/0xf3 [ 54.429119][ T8469] ? preempt_schedule_common+0x59/0xc0 [ 54.434558][ T8469] ? bdi_put+0x22/0xa0 [ 54.438622][ T8469] ? preempt_schedule_thunk+0x16/0x18 [ 54.443973][ T8469] ? trace_hardirqs_on+0x38/0x1c0 [ 54.448994][ T8469] ? trace_hardirqs_on+0x51/0x1c0 [ 54.454010][ T8469] ? bdi_put+0x22/0xa0 [ 54.458156][ T8469] ? bdi_put+0x22/0xa0 [ 54.462311][ T8469] end_report+0x58/0x5e [ 54.466463][ T8469] kasan_report.cold+0x67/0xd5 [ 54.471251][ T8469] ? bdi_put+0x22/0xa0 [ 54.475299][ T8469] check_memory_region+0x13d/0x180 [ 54.480402][ T8469] bdi_put+0x22/0xa0 [ 54.484272][ T8469] bdev_evict_inode+0x262/0x460 [ 54.489125][ T8469] ? __blkdev_direct_IO_simple+0x930/0x930 [ 54.494928][ T8469] evict+0x2ed/0x6b0 [ 54.498815][ T8469] iput.part.0+0x57e/0x810 [ 54.503233][ T8469] ? find_inode_nowait+0x190/0x190 [ 54.508587][ T8469] iput+0x58/0x70 [ 54.512201][ T8469] dentry_unlink_inode+0x2b1/0x3d0 [ 54.517701][ T8469] __dentry_kill+0x3c0/0x640 [ 54.522458][ T8469] ? dput+0x35/0xbc0 [ 54.526480][ T8469] ? dput+0x35/0xbc0 [ 54.530355][ T8469] dput+0x725/0xbc0 [ 54.534146][ T8469] shrink_dcache_for_umount+0x11f/0x330 [ 54.539676][ T8469] generic_shutdown_super+0x68/0x370 [ 54.544949][ T8469] kill_anon_super+0x36/0x60 [ 54.549534][ T8469] deactivate_locked_super+0x94/0x160 [ 54.554897][ T8469] deactivate_super+0xad/0xd0 [ 54.559561][ T8469] put_fs_context+0xaa/0x650 [ 54.564149][ T8469] ? __sanitizer_cov_trace_const_cmp2+0x22/0x80 [ 54.570394][ T8469] fscontext_release+0x4c/0x60 [ 54.575150][ T8469] __fput+0x283/0x920 [ 54.579208][ T8469] ? fs_validate_description+0x1d0/0x1d0 [ 54.584926][ T8469] task_work_run+0xdd/0x190 [ 54.589423][ T8469] do_exit+0xc5c/0x2ae0 [ 54.593637][ T8469] ? kfree+0x2d3/0x360 [ 54.597700][ T8469] ? mm_update_next_owner+0x7a0/0x7a0 [ 54.603076][ T8469] ? __do_sys_fsconfig+0x1c2/0xbd0 [ 54.608188][ T8469] ? fscontext_read+0x310/0x310 [ 54.613039][ T8469] do_group_exit+0x125/0x310 [ 54.617612][ T8469] __x64_sys_exit_group+0x3a/0x50 [ 54.622616][ T8469] do_syscall_64+0x2d/0x70 [ 54.627578][ T8469] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 54.633560][ T8469] RIP: 0033:0x43ee78 [ 54.637592][ T8469] Code: Unable to access opcode bytes at RIP 0x43ee4e. [ 54.644429][ T8469] RSP: 002b:00007ffcbc2effd8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 54.652827][ T8469] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ee78 [ 54.660800][ T8469] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 54.668856][ T8469] RBP: 00000000004be688 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 54.676819][ T8469] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 54.684962][ T8469] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 54.697499][ T8469] Kernel Offset: disabled [ 54.702183][ T8469] Rebooting in 86400 seconds..