syzbot

random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
random: sshd: uninitialized urandom read (32 bytes read)
==================================================================
BUG: KMSAN: uninit-value in predicate_parse kernel/trace/trace_events_filter.c:563 [inline]
BUG: KMSAN: uninit-value in process_preds+0x43b6/0x5060 kernel/trace/trace_events_filter.c:1508
CPU: 0 PID: 4504 Comm: syz-executor388 Not tainted 4.17.0+ #8
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+0x185/0x1d0 lib/dump_stack.c:113
 kmsan_report+0x188/0x2a0 mm/kmsan/kmsan.c:1122
 __msan_warning_32+0x70/0xc0 mm/kmsan/kmsan_instr.c:620
 predicate_parse kernel/trace/trace_events_filter.c:563 [inline]
 process_preds+0x43b6/0x5060 kernel/trace/trace_events_filter.c:1508
 create_filter kernel/trace/trace_events_filter.c:1716 [inline]
 ftrace_profile_set_filter+0x2aa/0x6a0 kernel/trace/trace_events_filter.c:2041
 perf_event_set_filter kernel/events/core.c:9079 [inline]
 _perf_ioctl kernel/events/core.c:5059 [inline]
 perf_ioctl+0x1ca8/0x5870 kernel/events/core.c:5110
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0xcbd/0x24b0 fs/ioctl.c:686
 ksys_ioctl fs/ioctl.c:701 [inline]
 __do_sys_ioctl fs/ioctl.c:708 [inline]
 __se_sys_ioctl fs/ioctl.c:706 [inline]
 __x64_sys_ioctl+0x280/0x320 fs/ioctl.c:706
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x43fdb9
RSP: 002b:00007ffd4188e7a8 EFLAGS: 00000213 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdb9
RDX: 0000000020000040 RSI: 0000000040082406 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000213 R12: 00000000004016e0
R13: 0000000000401770 R14: 0000000000000000 R15: 0000000000000000

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:279 [inline]
 kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:189
 kmsan_kmalloc+0x94/0x100 mm/kmsan/kmsan.c:315
 __kmalloc+0x13a/0x350 mm/slub.c:3818
 kmalloc include/linux/slab.h:517 [inline]
 predicate_parse kernel/trace/trace_events_filter.c:442 [inline]
 process_preds+0x826/0x5060 kernel/trace/trace_events_filter.c:1508
 create_filter kernel/trace/trace_events_filter.c:1716 [inline]
 ftrace_profile_set_filter+0x2aa/0x6a0 kernel/trace/trace_events_filter.c:2041
 perf_event_set_filter kernel/events/core.c:9079 [inline]
 _perf_ioctl kernel/events/core.c:5059 [inline]
 perf_ioctl+0x1ca8/0x5870 kernel/events/core.c:5110
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0xcbd/0x24b0 fs/ioctl.c:686
 ksys_ioctl fs/ioctl.c:701 [inline]
 __do_sys_ioctl fs/ioctl.c:708 [inline]
 __se_sys_ioctl fs/ioctl.c:706 [inline]
 __x64_sys_ioctl+0x280/0x320 fs/ioctl.c:706
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
==================================================================