Hello, syzbot found the following issue on: HEAD commit: 4a3e741a3d6a x86: fortify: kmsan: fix KMSAN fortify builds git tree: https://github.com/google/kmsan.git master console+strace: https://syzkaller.appspot.com/x/log.txt?x=14247636880000 kernel config: https://syzkaller.appspot.com/x/.config?x=c19210a0c25eebb dashboard link: https://syzkaller.appspot.com/bug?extid=d168ec0caca4697e03b1 compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project.git 610139d2d9ce6746b3c617fb3e2f7886272d26ff), GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13e16e86880000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1535a2f6880000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/fbb1997bc1e0/disk-4a3e741a.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d5dd2e1efaa4/vmlinux-4a3e741a.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d168ec0caca4697e03b1@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== BUG: KMSAN: uninit-value in can_is_canxl_skb include/linux/can/skb.h:128 [inline] BUG: KMSAN: uninit-value in can_send+0x269/0x1100 net/can/af_can.c:205 can_is_canxl_skb include/linux/can/skb.h:128 [inline] can_send+0x269/0x1100 net/can/af_can.c:205 j1939_send_one+0x40f/0x4d0 net/can/j1939/main.c:352 j1939_xtp_do_tx_ctl+0x69f/0x9e0 net/can/j1939/transport.c:664 j1939_tp_tx_ctl net/can/j1939/transport.c:672 [inline] j1939_session_tx_rts net/can/j1939/transport.c:740 [inline] j1939_xtp_txnext_transmiter net/can/j1939/transport.c:880 [inline] j1939_tp_txtimer+0x35bb/0x4520 net/can/j1939/transport.c:1158 __run_hrtimer+0x298/0x910 kernel/time/hrtimer.c:1685 __hrtimer_run_queues kernel/time/hrtimer.c:1749 [inline] hrtimer_run_softirq+0x4b0/0x870 kernel/time/hrtimer.c:1766 __do_softirq+0x1c5/0x7b9 kernel/softirq.c:571 invoke_softirq+0x8f/0x100 kernel/softirq.c:445 __irq_exit_rcu+0x5a/0x110 kernel/softirq.c:650 irq_exit_rcu+0xe/0x10 kernel/softirq.c:662 sysvec_apic_timer_interrupt+0x9a/0xc0 arch/x86/kernel/apic/apic.c:1107 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:649 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock_irqrestore+0x2f/0x50 kernel/locking/spinlock.c:194 unlock_hrtimer_base kernel/time/hrtimer.c:1017 [inline] hrtimer_start_range_ns+0xaba/0xb50 kernel/time/hrtimer.c:1301 hrtimer_start include/linux/hrtimer.h:418 [inline] j1939_tp_schedule_txtimer+0xbe/0x100 net/can/j1939/transport.c:697 j1939_sk_send_loop net/can/j1939/socket.c:1143 [inline] j1939_sk_sendmsg+0x1c2c/0x25d0 net/can/j1939/socket.c:1256 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline] ____sys_sendmsg+0xa8e/0xe70 net/socket.c:2482 ___sys_sendmsg+0x2a1/0x3f0 net/socket.c:2536 __sys_sendmsg net/socket.c:2565 [inline] __do_sys_sendmsg net/socket.c:2574 [inline] __se_sys_sendmsg net/socket.c:2572 [inline] __x64_sys_sendmsg+0x367/0x540 net/socket.c:2572 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+0x63/0xcd Uninit was created at: slab_post_alloc_hook mm/slab.h:742 [inline] slab_alloc_node mm/slub.c:3398 [inline] __kmem_cache_alloc_node+0x6ee/0xc90 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:954 [inline] __kmalloc_node_track_caller+0x117/0x3d0 mm/slab_common.c:975 kmalloc_reserve net/core/skbuff.c:437 [inline] __alloc_skb+0x34a/0xca0 net/core/skbuff.c:509 alloc_skb include/linux/skbuff.h:1267 [inline] j1939_tp_tx_dat_new net/can/j1939/transport.c:593 [inline] j1939_xtp_do_tx_ctl+0xa3/0x9e0 net/can/j1939/transport.c:654 j1939_tp_tx_ctl net/can/j1939/transport.c:672 [inline] j1939_session_tx_rts net/can/j1939/transport.c:740 [inline] j1939_xtp_txnext_transmiter net/can/j1939/transport.c:880 [inline] j1939_tp_txtimer+0x35bb/0x4520 net/can/j1939/transport.c:1158 __run_hrtimer+0x298/0x910 kernel/time/hrtimer.c:1685 __hrtimer_run_queues kernel/time/hrtimer.c:1749 [inline] hrtimer_run_softirq+0x4b0/0x870 kernel/time/hrtimer.c:1766 __do_softirq+0x1c5/0x7b9 kernel/softirq.c:571 CPU: 0 PID: 3506 Comm: syz-executor289 Not tainted 6.1.0-rc2-syzkaller-61955-g4a3e741a3d6a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 ===================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
