===================================================== BUG: KMSAN: uninit-value in compound_head include/linux/page-flags.h:182 [inline] BUG: KMSAN: uninit-value in put_page include/linux/mm.h:1154 [inline] BUG: KMSAN: uninit-value in __skb_frag_unref include/linux/skbuff.h:2999 [inline] BUG: KMSAN: uninit-value in skb_release_data+0x4b4/0xde0 net/core/skbuff.c:604 CPU: 1 PID: 8773 Comm: syz-executor104 Not tainted 5.8.0-rc5-syzkaller #0 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+0x21c/0x280 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:121 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215 compound_head include/linux/page-flags.h:182 [inline] put_page include/linux/mm.h:1154 [inline] __skb_frag_unref include/linux/skbuff.h:2999 [inline] skb_release_data+0x4b4/0xde0 net/core/skbuff.c:604 skb_release_all net/core/skbuff.c:664 [inline] __kfree_skb+0x9e/0x320 net/core/skbuff.c:678 kfree_skb+0x323/0x390 net/core/skbuff.c:696 validate_xmit_skb+0x1386/0x1aa0 net/core/dev.c:3659 __dev_queue_xmit+0x2aa5/0x4470 net/core/dev.c:4123 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4164 mrp_queue_xmit net/802/mrp.c:351 [inline] mrp_join_timer+0x1fc/0x380 net/802/mrp.c:595 call_timer_fn+0x226/0x550 kernel/time/timer.c:1404 expire_timers+0x4fc/0x780 kernel/time/timer.c:1449 __run_timers+0xaf4/0xd30 kernel/time/timer.c:1773 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1786 __do_softirq+0x2ea/0x7f5 kernel/softirq.c:293 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711 __run_on_irqstack arch/x86/include/asm/irq_stack.h:23 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:50 [inline] do_softirq_own_stack+0x7c/0xa0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:390 [inline] __irq_exit_rcu+0x226/0x270 kernel/softirq.c:420 irq_exit_rcu+0xe/0x10 kernel/softirq.c:432 sysvec_apic_timer_interrupt+0x107/0x130 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:593 RIP: 0010:console_unlock+0x195c/0x1e10 kernel/printk/printk.c:2503 Code: c8 00 00 00 48 8b 9c 24 c0 00 00 00 e8 5d d3 00 00 48 85 db 0f 85 89 00 00 00 4c 89 bc 24 28 01 00 00 ff b4 24 28 01 00 00 9d <44> 89 f0 34 01 22 44 24 3f 44 89 f3 0a 5c 24 2a 3c 01 74 76 f6 c3 RSP: 0018:ffff8880b7c8a830 EFLAGS: 00000282 RAX: 00007ffffffff000 RBX: 0000000000000000 RCX: ffff88811a098000 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 000000000001b9a0 RBP: ffff8880b7c8a9b8 R08: ffffea000000000f R09: ffff88812fffa000 R10: 0000000000000000 R11: 00000000ffffffff R12: ffffffff925cad60 R13: ffff88811a0989d8 R14: 0000000000000000 R15: 0000000000000282 vprintk_emit+0x48f/0x990 kernel/printk/printk.c:2028 vprintk_default+0x90/0xa0 kernel/printk/printk.c:2046 vprintk_func+0x2f7/0x300 kernel/printk/printk_safe.c:393 printk+0x18b/0x1d3 kernel/printk/printk.c:2077 addrconf_notify+0x2f35/0x6400 net/ipv6/addrconf.c:3542 notifier_call_chain kernel/notifier.c:83 [inline] __raw_notifier_call_chain kernel/notifier.c:361 [inline] raw_notifier_call_chain+0x123/0x290 kernel/notifier.c:368 call_netdevice_notifiers_info net/core/dev.c:2027 [inline] __dev_notify_flags+0x90e/0xb90 net/core/dev.c:8330 rtnl_configure_link+0x492/0x4e0 net/core/rtnetlink.c:3028 __rtnl_newlink net/core/rtnetlink.c:3357 [inline] rtnl_newlink+0x2f10/0x3ed0 net/core/rtnetlink.c:3397 rtnetlink_rcv_msg+0x142b/0x18c0 net/core/rtnetlink.c:5460 netlink_rcv_skb+0x6d7/0x7e0 net/netlink/af_netlink.c:2469 rtnetlink_rcv+0x50/0x60 net/core/rtnetlink.c:5478 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x11c8/0x1490 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x173a/0x1840 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] ____sys_sendmsg+0xc82/0x1240 net/socket.c:2352 ___sys_sendmsg net/socket.c:2406 [inline] __sys_sendmsg+0x6d1/0x840 net/socket.c:2439 __do_sys_sendmsg net/socket.c:2448 [inline] __se_sys_sendmsg+0x97/0xb0 net/socket.c:2446 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2446 do_syscall_64+0xad/0x160 arch/x86/entry/common.c:386 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x441929 Code: Bad RIP value. RSP: 002b:00007ffca7a67de8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441929 RDX: 0000000000000000 RSI: 0000000020000280 RDI: 0000000000000005 RBP: 00007ffca7a67df0 R08: 0000000100000000 R09: 0000000100000000 R10: 0000000100000000 R11: 0000000000000246 R12: 00000000000244e3 R13: 0000000000402800 R14: 0000000000000000 R15: 0000000000000000 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:144 [inline] kmsan_internal_poison_shadow+0x66/0xd0 mm/kmsan/kmsan.c:127 kmsan_slab_alloc+0x8a/0xe0 mm/kmsan/kmsan_hooks.c:80 slab_alloc_node mm/slub.c:2839 [inline] __kmalloc_node_track_caller+0xeab/0x12e0 mm/slub.c:4478 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0x35f/0xb30 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1083 [inline] mrp_pdu_init net/802/mrp.c:300 [inline] mrp_pdu_append_vecattr_event+0x4ad/0x2310 net/802/mrp.c:399 mrp_attr_event+0x2a1/0x4e0 net/802/mrp.c:494 mrp_mad_event net/802/mrp.c:574 [inline] mrp_join_timer+0x10e/0x380 net/802/mrp.c:591 call_timer_fn+0x226/0x550 kernel/time/timer.c:1404 expire_timers+0x4fc/0x780 kernel/time/timer.c:1449 __run_timers+0xaf4/0xd30 kernel/time/timer.c:1773 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1786 __do_softirq+0x2ea/0x7f5 kernel/softirq.c:293 =====================================================