=====================================================
BUG: KMSAN: use-after-free in __alloc_skb+0x215/0xa10 net/core/skbuff.c:197
CPU: 0 PID: 12155 Comm: syz-fuzzer Not tainted 5.3.0-rc7+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x191/0x1f0 lib/dump_stack.c:113
 kmsan_report+0x17d/0x2f0 mm/kmsan/kmsan_report.c:114
 __msan_warning+0x73/0xe0 mm/kmsan/kmsan_instr.c:250
 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:1135
 apic_timer_interrupt+0x2e/0x40 arch/x86/entry/entry_64.S:837
 </IRQ>
RIP: 0010:kmsan_get_shadow_origin_ptr+0x6e/0x4c0 mm/kmsan/kmsan_shadow.c:175
Code: 7d 85 c0 74 18 4c 89 e3 48 89 d8 4c 89 e2 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 4c 89 f7 4c 89 fe 31 d2 e8 02 cf ff ff <84> c0 0f 84 45 04 00 00 48 b8 ff ff ff ff ff d0 ff ff 4d 89 f5 49
RSP: 0018:ffff8880b69bf620 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 0000000013a6a701 RBX: ffff8880b69bf808 RCX: ffff888113a69e40
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880b69bf808
RBP: ffff8880b69bf650 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8182a660 R12: ffffffff902c1000
R13: ffff888113a6a7e0 R14: ffff8880b69bf808 R15: 0000000000000004
 __msan_metadata_ptr_for_load_4+0x10/0x20 mm/kmsan/kmsan_instr.c:54
 stack_trace_consume_entry+0x68/0x320 kernel/stacktrace.c:86
 arch_stack_walk+0x30f/0x3e0 arch/x86/kernel/stacktrace.c:27
 stack_trace_save+0x11c/0x1b0 kernel/stacktrace.c:123
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:154 [inline]
 kmsan_internal_chain_origin+0xde/0x190 mm/kmsan/kmsan.c:325
 kmsan_memcpy_memmove_metadata+0x25b/0x2d0 mm/kmsan/kmsan.c:251
 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:271
 __msan_memcpy+0x56/0x70 mm/kmsan/kmsan_instr.c:129
 sock_read_iter+0x47c/0x660 net/socket.c:968
 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: 0033:0x47fd44
Code: ff ff cc cc cc cc e8 9b 40 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:000000c420301760 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047fd44
RDX: 0000000000001000 RSI: 000000c420356000 RDI: 0000000000000003
RBP: 000000c4203017b0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008
R13: 0000000000000008 R14: 0000000000000004 R15: ffffffffffffffff

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:154 [inline]
 kmsan_internal_chain_origin+0xde/0x190 mm/kmsan/kmsan.c:325
 __msan_chain_origin+0x6b/0xe0 mm/kmsan/kmsan_instr.c:184
 ___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:1135
 apic_timer_interrupt+0x2e/0x40 arch/x86/entry/entry_64.S:837
 kmsan_get_shadow_origin_ptr+0x6e/0x4c0 mm/kmsan/kmsan_shadow.c:175
 __msan_metadata_ptr_for_load_4+0x10/0x20 mm/kmsan/kmsan_instr.c:54
 stack_trace_consume_entry+0x68/0x320 kernel/stacktrace.c:86
 arch_stack_walk+0x30f/0x3e0 arch/x86/kernel/stacktrace.c:27
 stack_trace_save+0x11c/0x1b0 kernel/stacktrace.c:123
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:154 [inline]
 kmsan_internal_chain_origin+0xde/0x190 mm/kmsan/kmsan.c:325
 kmsan_memcpy_memmove_metadata+0x25b/0x2d0 mm/kmsan/kmsan.c:251
 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:271
 __msan_memcpy+0x56/0x70 mm/kmsan/kmsan_instr.c:129
 sock_read_iter+0x47c/0x660 net/socket.c:968
 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:154 [inline]
 kmsan_internal_poison_shadow+0x60/0x120 mm/kmsan/kmsan.c:137
 kmsan_slab_free+0x8d/0x100 mm/kmsan/kmsan_hooks.c:123
 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:6441
 __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
 freelist_dereference mm/slub.c:276 [inline]
 get_freepointer mm/slub.c:282 [inline]
 get_freepointer_safe mm/slub.c:306 [inline]
 slab_alloc_node mm/slub.c:2753 [inline]
 __kmalloc_node_track_caller+0x6e2/0x1320 mm/slub.c:4388
 __kmalloc_reserve net/core/skbuff.c:141 [inline]
 __alloc_skb+0x306/0xa10 net/core/skbuff.c:209
 alloc_skb include/linux/skbuff.h:1056 [inline]
 __tcp_send_ack+0xfb/0x840 net/ipv4/tcp_output.c:3664
 tcp_send_ack+0x68/0x90 net/ipv4/tcp_output.c:3691
 tcp_cleanup_rbuf+0x764/0x800 net/ipv4/tcp.c:1575
 tcp_recvmsg+0x334d/0x4ff0 net/ipv4/tcp.c:2179
 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
=====================================================