================================================================== 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: 11507 Comm: syz-fuzzer Not tainted 5.3.0-rc3+ #17 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:finish_lock_switch+0x2b/0x40 kernel/sched/core.c:3007 Code: 48 89 e5 53 48 89 fb e8 93 a4 9c 00 8b b8 88 0c 00 00 48 8b 00 48 85 c0 75 12 48 89 df e8 0d 9a 9c 00 c6 00 00 c6 03 00 fb 5b <5d> c3 e8 8e a3 9c 00 eb e7 66 90 66 2e 0f 1f 84 00 00 00 00 00 55 RSP: 0018:ffff8880ad69fd20 EFLAGS: 00000292 ORIG_RAX: ffffffffffffff13 RAX: ffff88821fef2300 RBX: ffff8881121a1e40 RCX: ccccccccccccd000 RDX: ffff88821fe11300 RSI: ffffea000a9faba0 RDI: ffff88812fcd6300 RBP: ffff8880ad69fd20 R08: ffffea000000000f R09: ffff88812fffb000 R10: 0000000000000004 R11: 0000000000000000 R12: 0000000000000001 R13: ffff888112cd27e0 R14: ffff888112cd1e40 R15: ffff88812fcd6300 finish_task_switch+0xfa/0x2d0 kernel/sched/core.c:3108 context_switch kernel/sched/core.c:3261 [inline] __schedule+0x646/0x780 kernel/sched/core.c:3886 schedule+0x19b/0x2d0 kernel/sched/core.c:3950 exit_to_usermode_loop arch/x86/entry/common.c:149 [inline] prepare_exit_to_usermode+0x222/0x4d0 arch/x86/entry/common.c:194 syscall_return_slowpath+0x90/0x610 arch/x86/entry/common.c:274 do_syscall_64+0xe2/0xf0 arch/x86/entry/common.c:300 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x45ddf3 Code: cc cc cc cc cc cc cc 48 8b 7c 24 08 8b 74 24 10 8b 54 24 14 4c 8b 54 24 18 4c 8b 44 24 20 44 8b 4c 24 28 b8 ca 00 00 00 0f 05 <89> 44 24 30 c3 cc cc cc cc cc cc cc cc 8b 7c 24 08 48 8b 74 24 10 RSP: 002b:000000c420065f20 EFLAGS: 00000206 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 000000c420065fb8 RCX: 000000000045ddf3 RDX: 0000000000000001 RSI: 0000000000000001 RDI: 00000000017e4930 RBP: 000000c420065f70 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000008 R13: 0000000000000008 R14: 0000000000000040 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 finish_lock_switch+0x2b/0x40 kernel/sched/core.c:3007 finish_task_switch+0xfa/0x2d0 kernel/sched/core.c:3108 context_switch kernel/sched/core.c:3261 [inline] __schedule+0x646/0x780 kernel/sched/core.c:3886 schedule+0x19b/0x2d0 kernel/sched/core.c:3950 exit_to_usermode_loop arch/x86/entry/common.c:149 [inline] prepare_exit_to_usermode+0x222/0x4d0 arch/x86/entry/common.c:194 syscall_return_slowpath+0x90/0x610 arch/x86/entry/common.c:274 do_syscall_64+0xe2/0xf0 arch/x86/entry/common.c:300 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 native_safe_halt arch/x86/include/asm/irqflags.h:60 [inline] arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline] default_idle+0x53/0x90 arch/x86/kernel/process.c:580 arch_cpu_idle+0x25/0x30 arch/x86/kernel/process.c:571 default_idle_call kernel/sched/idle.c:94 [inline] cpuidle_idle_call kernel/sched/idle.c:154 [inline] do_idle+0x1d7/0x790 kernel/sched/idle.c:263 cpu_startup_entry+0x45/0x50 kernel/sched/idle.c:354 rest_init+0x1be/0x1f0 init/main.c:452 arch_call_rest_init+0x13/0x15 start_kernel+0x991/0xb61 init/main.c:788 x86_64_start_reservations+0x18/0x2e arch/x86/kernel/head64.c:472 x86_64_start_kernel+0x81/0x84 arch/x86/kernel/head64.c:453 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241 ==================================================================