FS: 00007f8b6b363700(0000) GS:ffff88813fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000200002c0 CR3: 0000000120fbb000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ===================================================== BUG: KMSAN: uninit-value in show_trace_log_lvl+0x825/0xbb0 arch/x86/kernel/dumpstack.c:246 show_trace_log_lvl+0x825/0xbb0 arch/x86/kernel/dumpstack.c:246 show_regs+0xad/0xd0 arch/x86/kernel/dumpstack.c:469 __warn+0x242/0x580 kernel/panic.c:596 report_bug+0x7d4/0x9e0 lib/bug.c:199 handle_bug+0x41/0x70 arch/x86/kernel/traps.c:315 exc_invalid_op+0x1b/0x50 arch/x86/kernel/traps.c:335 asm_exc_invalid_op+0x12/0x20 netif_napi_add+0xa0e/0xed0 netif_tx_napi_add include/linux/netdevice.h:2524 [inline] tun_napi_init drivers/net/tun.c:271 [inline] tun_attach+0xe26/0x21a0 drivers/net/tun.c:813 tun_net_init+0x468/0x650 drivers/net/tun.c:994 register_netdevice+0x4bf/0x21f0 net/core/dev.c:9891 tun_set_iff+0xc14/0x1610 drivers/net/tun.c:2810 __tun_chr_ioctl+0xcfb/0x3bd0 drivers/net/tun.c:3069 tun_chr_ioctl+0x3f/0x50 drivers/net/tun.c:3354 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0x222/0x400 fs/ioctl.c:856 __x64_sys_ioctl+0x92/0xd0 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Local variable tmp created at: number+0x75/0x1ff0 lib/vsprintf.c:458 vsnprintf+0x1d0a/0x29a0 lib/vsprintf.c:2872 CPU: 0 PID: 3473 Comm: syz-executor448 Not tainted 5.18.0-syzkaller-16265-g365ac3bfacfb #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 =====================================================