WARNING in format

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	WARNING in format_decode fs	-1	C			1	2729d	2728d	5/29	fixed on 2018/05/08 18:30
linux-5.15	WARNING in format_decode origin:upstream	-1	C			328	27d	671d	0/3	upstream: reported C repro on 2023/11/17 23:37
upstream	WARNING in format_decode (3) bpf trace	-1	C	done		2248	61d	667d	29/29	fixed on 2025/09/04 16:57
linux-6.6	WARNING in format_decode	-1	C		done	36	68d	87d	2/2	fixed on 2025/08/14 13:18
upstream	WARNING in format_decode (2) trace	-1	C			16	2498d	2580d	11/29	fixed on 2018/12/07 08:24
linux-6.1	WARNING in format_decode origin:upstream	-1	C		done	314	69d	671d	3/3	fixed on 2025/08/12 17:33

------------[ cut here ]------------ WARNING: CPU: 1 PID: 4713 at lib/vsprintf.c:1897 format_decode+0x7bb/0x9e0 lib/vsprintf.c:1897 Please remove unsupported %� in format string Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 4713 Comm: syz-executor0 Not tainted 4.9.135+ #110 ffff8801ce997358 ffffffff81b36bf9 ffffffff82a38ba0 00000000ffffffff 0000000000000000 0000000000000001 0000000000000769 ffff8801ce997418 ffffffff813f6aa5 0000000041b58ab3 ffffffff82e29bcb ffffffff813f68e6 Call Trace: [<ffffffff81b36bf9>] __dump_stack lib/dump_stack.c:15 [inline] [<ffffffff81b36bf9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [<ffffffff813f6aa5>] panic+0x1bf/0x39f kernel/panic.c:179 [<ffffffff813f6d74>] __warn.cold.9+0xc1/0x17f kernel/panic.c:542 [<ffffffff810dbcc2>] warn_slowpath_fmt+0xc2/0x100 kernel/panic.c:565 [<ffffffff81b5751b>] format_decode+0x7bb/0x9e0 lib/vsprintf.c:1897 [<ffffffff81b60aa3>] vsnprintf+0x163/0x1840 lib/vsprintf.c:1993 [<ffffffff815822a3>] seq_vprintf+0xe3/0x1a0 fs/seq_file.c:403 [<ffffffff8158240b>] seq_printf+0xab/0xe0 fs/seq_file.c:418 [<ffffffff82723417>] get_tcp6_sock net/ipv6/tcp_ipv6.c:1787 [inline] [<ffffffff82723417>] tcp6_seq_show+0xdf7/0x1ad0 net/ipv6/tcp_ipv6.c:1861 [<ffffffff81581135>] seq_read+0xa75/0x12d0 fs/seq_file.c:275 [<ffffffff8165bf9d>] proc_reg_read+0xfd/0x180 fs/proc/inode.c:203 [<ffffffff81509de5>] do_loop_readv_writev.part.1+0xd5/0x280 fs/read_write.c:718 [<ffffffff8150b48e>] do_loop_readv_writev fs/read_write.c:707 [inline] [<ffffffff8150b48e>] do_readv_writev+0x56e/0x7b0 fs/read_write.c:873 [<ffffffff8150b754>] vfs_readv+0x84/0xc0 fs/read_write.c:897 [<ffffffff8150bb87>] do_preadv+0x197/0x240 fs/read_write.c:974 [<ffffffff8150f140>] SYSC_preadv fs/read_write.c:1024 [inline] [<ffffffff8150f140>] SyS_preadv+0x30/0x40 fs/read_write.c:1019 [<ffffffff810056ef>] do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285 [<ffffffff82803413>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Kernel Offset: disabled Rebooting in 86400 seconds..