===================================================== BUG: KMSAN: uninit-value in set_field_width lib/vsprintf.c:2685 [inline] BUG: KMSAN: uninit-value in vsnprintf+0x2beb/0x36a0 lib/vsprintf.c:2766 set_field_width lib/vsprintf.c:2685 [inline] vsnprintf+0x2beb/0x36a0 lib/vsprintf.c:2766 seq_vprintf fs/seq_file.c:407 [inline] seq_printf+0x301/0x500 fs/seq_file.c:422 dev_mc_seq_show+0x2f5/0x460 net/core/net-procfs.c:337 seq_read_iter+0x1589/0x2160 fs/seq_file.c:272 seq_read+0x7a6/0x990 fs/seq_file.c:162 pde_read fs/proc/inode.c:311 [inline] proc_reg_read+0x39d/0x560 fs/proc/inode.c:323 vfs_read+0x6c8/0x1980 fs/read_write.c:483 ksys_read+0x28c/0x520 fs/read_write.c:623 __do_sys_read fs/read_write.c:633 [inline] __se_sys_read fs/read_write.c:631 [inline] __x64_sys_read+0xdb/0x120 fs/read_write.c:631 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x44/0xae Local variable ----sample.i@event_sched_in created at: perf_log_itrace_start kernel/events/core.c:9043 [inline] event_sched_in+0x13d1/0x33e0 kernel/events/core.c:2557 group_sched_in kernel/events/core.c:2595 [inline] merge_sched_in kernel/events/core.c:3723 [inline] visit_groups_merge+0x2749/0x6040 kernel/events/core.c:3696 ===================================================== Kernel panic - not syncing: panic_on_kmsan set ... CPU: 1 PID: 15361 Comm: syz-executor.2 Tainted: G B W 5.15.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1ff/0x28e lib/dump_stack.c:106 dump_stack+0x25/0x28 lib/dump_stack.c:113 panic+0x44f/0xdeb kernel/panic.c:232 kmsan_report+0x2ee/0x300 mm/kmsan/report.c:168 __msan_warning+0xa9/0xf0 mm/kmsan/instrumentation.c:199 set_field_width lib/vsprintf.c:2685 [inline] vsnprintf+0x2beb/0x36a0 lib/vsprintf.c:2766 seq_vprintf fs/seq_file.c:407 [inline] seq_printf+0x301/0x500 fs/seq_file.c:422 dev_mc_seq_show+0x2f5/0x460 net/core/net-procfs.c:337 seq_read_iter+0x1589/0x2160 fs/seq_file.c:272 seq_read+0x7a6/0x990 fs/seq_file.c:162 pde_read fs/proc/inode.c:311 [inline] proc_reg_read+0x39d/0x560 fs/proc/inode.c:323 vfs_read+0x6c8/0x1980 fs/read_write.c:483 ksys_read+0x28c/0x520 fs/read_write.c:623 __do_sys_read fs/read_write.c:633 [inline] __se_sys_read fs/read_write.c:631 [inline] __x64_sys_read+0xdb/0x120 fs/read_write.c:631 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f51eaea88d9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f51e841f188 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007f51eafacf60 RCX: 00007f51eaea88d9 RDX: 0000000000002020 RSI: 00000000200020c0 RDI: 0000000000000006 RBP: 00007f51eaf02cb4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f51eb4e0b2f R14: 00007f51e841f300 R15: 0000000000022000 Kernel Offset: disabled Rebooting in 86400 seconds..