audit: type=1400 audit(1600628383.851:8): avc:  denied  { execmem } for  pid=6466 comm="syz-executor789" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1
================================================================================
UBSAN: Undefined behaviour in ./include/linux/log2.h:61:13
shift exponent 64 is too large for 64-bit type 'long unsigned int'
CPU: 0 PID: 6466 Comm: syz-executor789 Not tainted 4.19.146-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x22c/0x33e lib/dump_stack.c:118
 ubsan_epilogue+0xe/0x3a lib/ubsan.c:161
 __ubsan_handle_shift_out_of_bounds.cold+0x1c4/0x250 lib/ubsan.c:422
 __roundup_pow_of_two include/linux/log2.h:61 [inline]
 snd_pcm_oss_period_size sound/core/oss/pcm_oss.c:747 [inline]
 snd_pcm_oss_change_params_locked.cold+0x6d/0x11a sound/core/oss/pcm_oss.c:943
 snd_pcm_oss_change_params sound/core/oss/pcm_oss.c:1102 [inline]
 snd_pcm_oss_get_active_substream+0x164/0x1c0 sound/core/oss/pcm_oss.c:1119
 snd_pcm_oss_get_channels sound/core/oss/pcm_oss.c:1806 [inline]
 snd_pcm_oss_set_channels+0x244/0x380 sound/core/oss/pcm_oss.c:1798
 snd_pcm_oss_ioctl+0x12dd/0x33c0 sound/core/oss/pcm_oss.c:2644
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x440269
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
RSP: 002b:00007ffc5f0ff428 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440269
RDX: 00000