================================================================== BUG: KMSAN: uninit-value in slab_alloc_node mm/slub.c:2749 [inline] BUG: KMSAN: uninit-value in kmem_cache_alloc_node+0x5d0/0xe70 mm/slub.c:2828 CPU: 0 PID: 12857 Comm: syz-fuzzer Not tainted 5.3.0-rc3+ #16 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+0x191/0x1f0 lib/dump_stack.c:113 kmsan_report+0x162/0x2d0 mm/kmsan/kmsan_report.c:109 __msan_warning+0x75/0xe0 mm/kmsan/kmsan_instr.c:294 slab_alloc_node mm/slub.c:2749 [inline] kmem_cache_alloc_node+0x5d0/0xe70 mm/slub.c:2828 __alloc_skb+0x215/0xa10 net/core/skbuff.c:197 alloc_skb include/linux/skbuff.h:1056 [inline] new_skb drivers/block/aoe/aoecmd.c:67 [inline] aoecmd_cfg_pkts drivers/block/aoe/aoecmd.c:426 [inline] aoecmd_cfg+0x205/0xa80 drivers/block/aoe/aoecmd.c:1372 discover_timer+0x86/0xa0 drivers/block/aoe/aoemain.c:24 call_timer_fn+0x232/0x530 kernel/time/timer.c:1322 expire_timers kernel/time/timer.c:1366 [inline] __run_timers+0xcdc/0x11a0 kernel/time/timer.c:1685 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1698 __do_softirq+0x4a1/0x83a kernel/softirq.c:293 invoke_softirq kernel/softirq.c:375 [inline] irq_exit+0x230/0x280 kernel/softirq.c:416 exiting_irq+0xe/0x10 arch/x86/include/asm/apic.h:537 smp_apic_timer_interrupt+0x48/0x70 arch/x86/kernel/apic/apic.c:1097 apic_timer_interrupt+0x2e/0x40 arch/x86/entry/entry_64.S:835 RIP: 0010:kmsan_get_shadow_origin_ptr+0x299/0x3a0 mm/kmsan/kmsan.c:706 Code: 63 c5 48 3d ff 4f 04 00 0f 86 c1 00 00 00 31 db e9 c8 fd ff ff 4c 89 f7 e8 a4 f3 ff ff 48 85 c0 0f 84 b4 fd ff ff 48 8b 70 40 <48> 85 f6 0f 84 a7 fd ff ff 48 8b 48 48 49 89 dc 48 85 c9 0f 84 9a RSP: 0018:ffff8880aebff480 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: ffffea000369bfb0 RBX: ffffffff902c1000 RCX: 000000000369bfb0 RDX: 00000000aebffbb8 RSI: ffffea00036550b0 RDI: ffff8880aebffbb8 RBP: ffff8880aebff4b0 R08: ffffea000000000f R09: ffff88812fffb000 R10: 00000000000000b2 R11: ffffffff8bb9b4b0 R12: 0000000000000004 R13: ffff8880aebffbb8 R14: ffff8880aebffbb8 R15: 0000000000000004 __msan_metadata_ptr_for_load_4+0x10/0x20 mm/kmsan/kmsan_instr.c:54 iov_iter_type include/linux/uio.h:56 [inline] iov_iter_is_pipe include/linux/uio.h:76 [inline] _copy_to_iter+0x88/0x26e0 lib/iov_iter.c:612 copy_to_iter include/linux/uio.h:138 [inline] simple_copy_to_iter+0x92/0xb0 net/core/datagram.c:515 __skb_datagram_iter+0x67e/0xf00 net/core/datagram.c:445 skb_copy_datagram_iter+0x29c/0x2b0 net/core/datagram.c:529 skb_copy_datagram_msg include/linux/skbuff.h:3421 [inline] tcp_recvmsg+0x1e61/0x4ff0 net/ipv4/tcp.c:2119 inet_recvmsg+0x237/0x7d0 net/ipv4/af_inet.c:838 sock_recvmsg_nosec net/socket.c:871 [inline] sock_recvmsg net/socket.c:889 [inline] sock_read_iter+0x5be/0x660 net/socket.c:967 call_read_iter include/linux/fs.h:1864 [inline] new_sync_read fs/read_write.c:414 [inline] __vfs_read+0xa67/0xc90 fs/read_write.c:427 vfs_read+0x359/0x6f0 fs/read_write.c:461 ksys_read+0x265/0x430 fs/read_write.c:587 __do_sys_read fs/read_write.c:597 [inline] __se_sys_read+0x92/0xb0 fs/read_write.c:595 __x64_sys_read+0x4a/0x70 fs/read_write.c:595 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x47fcb4 Code: ff ff cc cc cc cc e8 2b 41 fb ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 45 31 d2 45 31 c0 45 31 c9 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 RSP: 002b:000000c4202bf710 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fcb4 RDX: 0000000000001000 RSI: 000000c4202fa000 RDI: 0000000000000003 RBP: 000000c4202bf760 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000020 R13: 0000000000000020 R14: 0000000000000004 R15: ffffffffffffffff Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:187 [inline] kmsan_internal_chain_origin+0xcc/0x150 mm/kmsan/kmsan.c:345 __msan_chain_origin+0x6b/0xe0 mm/kmsan/kmsan_instr.c:190 ___slab_alloc+0x1dbc/0x1fb0 mm/slub.c:2634 __slab_alloc mm/slub.c:2687 [inline] slab_alloc_node mm/slub.c:2750 [inline] kmem_cache_alloc_node+0x769/0xe70 mm/slub.c:2828 __alloc_skb+0x215/0xa10 net/core/skbuff.c:197 alloc_skb include/linux/skbuff.h:1056 [inline] new_skb drivers/block/aoe/aoecmd.c:67 [inline] aoecmd_cfg_pkts drivers/block/aoe/aoecmd.c:426 [inline] aoecmd_cfg+0x205/0xa80 drivers/block/aoe/aoecmd.c:1372 discover_timer+0x86/0xa0 drivers/block/aoe/aoemain.c:24 call_timer_fn+0x232/0x530 kernel/time/timer.c:1322 expire_timers kernel/time/timer.c:1366 [inline] __run_timers+0xcdc/0x11a0 kernel/time/timer.c:1685 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1698 __do_softirq+0x4a1/0x83a kernel/softirq.c:293 invoke_softirq kernel/softirq.c:375 [inline] irq_exit+0x230/0x280 kernel/softirq.c:416 exiting_irq+0xe/0x10 arch/x86/include/asm/apic.h:537 smp_apic_timer_interrupt+0x48/0x70 arch/x86/kernel/apic/apic.c:1097 apic_timer_interrupt+0x2e/0x40 arch/x86/entry/entry_64.S:835 kmsan_get_shadow_origin_ptr+0x299/0x3a0 mm/kmsan/kmsan.c:706 __msan_metadata_ptr_for_load_4+0x10/0x20 mm/kmsan/kmsan_instr.c:54 iov_iter_type include/linux/uio.h:56 [inline] iov_iter_is_pipe include/linux/uio.h:76 [inline] _copy_to_iter+0x88/0x26e0 lib/iov_iter.c:612 copy_to_iter include/linux/uio.h:138 [inline] simple_copy_to_iter+0x92/0xb0 net/core/datagram.c:515 __skb_datagram_iter+0x67e/0xf00 net/core/datagram.c:445 skb_copy_datagram_iter+0x29c/0x2b0 net/core/datagram.c:529 skb_copy_datagram_msg include/linux/skbuff.h:3421 [inline] tcp_recvmsg+0x1e61/0x4ff0 net/ipv4/tcp.c:2119 inet_recvmsg+0x237/0x7d0 net/ipv4/af_inet.c:838 sock_recvmsg_nosec net/socket.c:871 [inline] sock_recvmsg net/socket.c:889 [inline] sock_read_iter+0x5be/0x660 net/socket.c:967 call_read_iter include/linux/fs.h:1864 [inline] new_sync_read fs/read_write.c:414 [inline] __vfs_read+0xa67/0xc90 fs/read_write.c:427 vfs_read+0x359/0x6f0 fs/read_write.c:461 ksys_read+0x265/0x430 fs/read_write.c:587 __do_sys_read fs/read_write.c:597 [inline] __se_sys_read+0x92/0xb0 fs/read_write.c:595 __x64_sys_read+0x4a/0x70 fs/read_write.c:595 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:187 [inline] kmsan_internal_poison_shadow+0x53/0xa0 mm/kmsan/kmsan.c:146 kmsan_slab_free+0x8d/0x100 mm/kmsan/kmsan_hooks.c:195 slab_free_freelist_hook mm/slub.c:1472 [inline] slab_free mm/slub.c:3038 [inline] kmem_cache_free_bulk+0x3ad9/0x3f50 mm/slub.c:3163 __kfree_skb_flush+0xb0/0x100 net/core/skbuff.c:862 net_rx_action+0x1908/0x1950 net/core/dev.c:6436 __do_softirq+0x4a1/0x83a kernel/softirq.c:293 invoke_softirq kernel/softirq.c:375 [inline] irq_exit+0x230/0x280 kernel/softirq.c:416 exiting_irq arch/x86/include/asm/apic.h:537 [inline] do_IRQ+0x20d/0x3a0 arch/x86/kernel/irq.c:259 ret_from_intr+0x0/0x33 ==================================================================