[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 73.638391][ T26] audit: type=1800 audit(1583562730.671:25): pid=9297 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 73.658697][ T26] audit: type=1800 audit(1583562730.671:26): pid=9297 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 73.728103][ T26] audit: type=1800 audit(1583562730.671:27): pid=9297 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.151' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 87.477054][T10094] ================================================================== [ 87.485371][T10094] BUG: KASAN: slab-out-of-bounds in resample_shrink+0x5eb/0x6f0 [ 87.493099][T10094] Read of size 2 at addr ffff8880a220ea00 by task syz-executor443/10094 [ 87.501413][T10094] [ 87.503907][T10094] CPU: 1 PID: 10094 Comm: syz-executor443 Not tainted 5.6.0-rc3-syzkaller #0 [ 87.512773][T10094] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 87.522985][T10094] Call Trace: [ 87.526278][T10094] dump_stack+0x188/0x20d [ 87.530617][T10094] ? resample_shrink+0x5eb/0x6f0 [ 87.535758][T10094] ? resample_shrink+0x5eb/0x6f0 [ 87.540693][T10094] print_address_description.constprop.0.cold+0xd3/0x315 [ 87.547851][T10094] ? resample_shrink+0x5eb/0x6f0 [ 87.552939][T10094] ? resample_shrink+0x5eb/0x6f0 [ 87.557990][T10094] __kasan_report.cold+0x1a/0x32 [ 87.562927][T10094] ? snd_pcm_kernel_ioctl+0x100/0x240 [ 87.568450][T10094] ? resample_shrink+0x5eb/0x6f0 executing program [ 87.573580][T10094] kasan_report+0xe/0x20 [ 87.577948][T10094] resample_shrink+0x5eb/0x6f0 [ 87.582722][T10094] rate_transfer+0x21a/0x2c0 [ 87.587314][T10094] snd_pcm_plug_read_transfer+0x180/0x2a0 [ 87.593029][T10094] ? snd_pcm_plug_write_transfer+0x3a0/0x3a0 [ 87.599002][T10094] ? snd_pcm_format_physical_width+0x71/0x90 [ 87.605066][T10094] ? snd_pcm_plug_client_channels_buf+0x20b/0x440 [ 87.611512][T10094] snd_pcm_oss_read2+0x1d0/0x3e0 [ 87.616473][T10094] ? snd_pcm_oss_read3+0x3f0/0x3f0 [ 87.621584][T10094] snd_pcm_oss_read+0x52b/0x6f0 [ 87.626437][T10094] ? rw_verify_area+0x11d/0x340 [ 87.631287][T10094] do_iter_read+0x47f/0x650 [ 87.635972][T10094] compat_readv+0x187/0x1f0 [ 87.640560][T10094] ? vfs_iter_read+0xa0/0xa0 [ 87.645145][T10094] ? rcu_read_lock_held_common+0x130/0x130 [ 87.650954][T10094] ? __fget_files+0x329/0x4f0 [ 87.655868][T10094] ? ksys_dup3+0x3c0/0x3c0 [ 87.660329][T10094] ? __fget_light+0x208/0x270 [ 87.665024][T10094] do_compat_readv+0xd5/0x1d0 [ 87.669698][T10094] ? compat_readv+0x1f0/0x1f0 [ 87.674368][T10094] ? fpregs_mark_activate+0x320/0x320 [ 87.679866][T10094] ? trace_hardirqs_off_caller+0x55/0x230 [ 87.685586][T10094] do_fast_syscall_32+0x270/0xdfb [ 87.690766][T10094] entry_SYSENTER_compat+0x70/0x7f [ 87.695905][T10094] [ 87.698245][T10094] Allocated by task 10094: [ 87.702664][T10094] save_stack+0x1b/0x80 [ 87.706817][T10094] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 87.712447][T10094] kvmalloc_node+0x61/0xf0 [ 87.717020][T10094] snd_pcm_plugin_alloc+0x56c/0x770 [ 87.722226][T10094] snd_pcm_plug_alloc+0x145/0x330 executing program [ 87.727272][T10094] snd_pcm_oss_change_params_locked+0x1f8b/0x34d0 [ 87.733686][T10094] snd_pcm_oss_change_params+0x76/0xd0 [ 87.739279][T10094] snd_pcm_oss_get_active_substream+0x129/0x180 [ 87.745767][T10094] snd_pcm_oss_ioctl+0xebe/0x31c0 [ 87.750953][T10094] __ia32_compat_sys_ioctl+0x23d/0x2b0 [ 87.756517][T10094] do_fast_syscall_32+0x270/0xdfb [ 87.761636][T10094] entry_SYSENTER_compat+0x70/0x7f [ 87.766734][T10094] [ 87.769159][T10094] Freed by task 9249: [ 87.773463][T10094] save_stack+0x1b/0x80 [ 87.777618][T10094] __kasan_slab_free+0xf7/0x140 [ 87.782472][T10094] kfree+0x109/0x2b0 [ 87.786523][T10094] tomoyo_supervisor+0x34d/0xee0 [ 87.792194][T10094] tomoyo_path_number_perm+0x3e9/0x4d0 [ 87.797660][T10094] security_file_ioctl+0x6c/0xb0 [ 87.802606][T10094] ksys_ioctl+0x50/0x180 [ 87.806848][T10094] __x64_sys_ioctl+0x6f/0xb0 [ 87.811436][T10094] do_syscall_64+0xf6/0x790 [ 87.816061][T10094] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 87.822056][T10094] [ 87.824385][T10094] The buggy address belongs to the object at ffff8880a220e800 [ 87.824385][T10094] which belongs to the cache kmalloc-512 of size 512 [ 87.838773][T10094] The buggy address is located 0 bytes to the right of [ 87.838773][T10094] 512-byte region [ffff8880a220e800, ffff8880a220ea00) [ 87.852637][T10094] The buggy address belongs to the page: [ 87.858276][T10094] page:ffffea0002888380 refcount:1 mapcount:0 mapping:ffff8880aa000a80 index:0x0 [ 87.867525][T10094] flags: 0xfffe0000000200(slab) executing program [ 87.872373][T10094] raw: 00fffe0000000200 ffffea0002888dc8 ffffea000284b108 ffff8880aa000a80 [ 87.881116][T10094] raw: 0000000000000000 ffff8880a220e000 0000000100000004 0000000000000000 [ 87.889981][T10094] page dumped because: kasan: bad access detected [ 87.896641][T10094] [ 87.898964][T10094] Memory state around the buggy address: [ 87.904585][T10094] ffff8880a220e900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 87.912757][T10094] ffff8880a220e980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 87.920815][T10094] >ffff8880a220ea00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc executing program executing program [ 87.928993][T10094] ^ [ 87.933344][T10094] ffff8880a220ea80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 87.941806][T10094] ffff8880a220eb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 87.950198][T10094] ================================================================== [ 87.958747][T10094] Disabling lock debugging due to kernel taint [ 87.969310][T10094] Kernel panic - not syncing: panic_on_warn set ... executing program [ 87.976089][T10094] CPU: 1 PID: 10094 Comm: syz-executor443 Tainted: G B 5.6.0-rc3-syzkaller #0 [ 87.986235][T10094] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 87.996499][T10094] Call Trace: [ 87.999803][T10094] dump_stack+0x188/0x20d [ 88.004127][T10094] panic+0x2e3/0x75c [ 88.008023][T10094] ? add_taint.cold+0x16/0x16 [ 88.012795][T10094] ? preempt_schedule_common+0x5e/0xc0 [ 88.018369][T10094] ? resample_shrink+0x5eb/0x6f0 [ 88.023309][T10094] ? ___preempt_schedule+0x16/0x18 [ 88.028618][T10094] ? trace_hardirqs_on+0x55/0x220 [ 88.033662][T10094] ? resample_shrink+0x5eb/0x6f0 [ 88.038730][T10094] end_report+0x43/0x49 [ 88.042889][T10094] ? resample_shrink+0x5eb/0x6f0 [ 88.047946][T10094] __kasan_report.cold+0xd/0x32 [ 88.052848][T10094] ? snd_pcm_kernel_ioctl+0x100/0x240 [ 88.058261][T10094] ? resample_shrink+0x5eb/0x6f0 [ 88.063195][T10094] kasan_report+0xe/0x20 [ 88.067432][T10094] resample_shrink+0x5eb/0x6f0 [ 88.072279][T10094] rate_transfer+0x21a/0x2c0 executing program executing program [ 88.077008][T10094] snd_pcm_plug_read_transfer+0x180/0x2a0 [ 88.082920][T10094] ? snd_pcm_plug_write_transfer+0x3a0/0x3a0 [ 88.088900][T10094] ? snd_pcm_format_physical_width+0x71/0x90 [ 88.094889][T10094] ? snd_pcm_plug_client_channels_buf+0x20b/0x440 [ 88.102018][T10094] snd_pcm_oss_read2+0x1d0/0x3e0 [ 88.106996][T10094] ? snd_pcm_oss_read3+0x3f0/0x3f0 [ 88.112140][T10094] snd_pcm_oss_read+0x52b/0x6f0 [ 88.117203][T10094] ? rw_verify_area+0x11d/0x340 [ 88.122059][T10094] do_iter_read+0x47f/0x650 executing program [ 88.126593][T10094] compat_readv+0x187/0x1f0 [ 88.131430][T10094] ? vfs_iter_read+0xa0/0xa0 [ 88.136129][T10094] ? rcu_read_lock_held_common+0x130/0x130 [ 88.141940][T10094] ? __fget_files+0x329/0x4f0 [ 88.146619][T10094] ? ksys_dup3+0x3c0/0x3c0 [ 88.151063][T10094] ? __fget_light+0x208/0x270 [ 88.156109][T10094] do_compat_readv+0xd5/0x1d0 [ 88.160793][T10094] ? compat_readv+0x1f0/0x1f0 [ 88.165476][T10094] ? fpregs_mark_activate+0x320/0x320 [ 88.170864][T10094] ? trace_hardirqs_off_caller+0x55/0x230 [ 88.176715][T10094] do_fast_syscall_32+0x270/0xdfb [ 88.181967][T10094] entry_SYSENTER_compat+0x70/0x7f [ 88.188631][T10094] Kernel Offset: disabled [ 88.192961][T10094] Rebooting in 86400 seconds..