BUG: unable to handle page fault for address: 00000960ffffea08 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 8449 Comm: syz-fuzzer Not tainted 5.12.0-rc8-next-20210423-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:find_stack lib/stackdepot.c:209 [inline] RIP: 0010:stack_depot_save+0x12b/0x4e0 lib/stackdepot.c:281 Code: 05 7a 64 b8 0c 89 da 81 e2 ff ff 0f 00 4c 8d 3c d0 4d 8b 37 4d 85 f6 75 11 e9 94 00 00 00 4d 8b 36 4d 85 f6 0f 84 88 00 00 00 <41> 39 5e 08 75 ee 45 3b 66 0c 75 e8 31 c0 49 8b 4c c6 18 48 39 4c RSP: 0018:ffffc9000130ebc0 EFLAGS: 00010206 RAX: ffff88823b000000 RBX: 000000004cbfd06f RCX: 0000000000000002 RDX: 00000000000fd06f RSI: 0000000000000800 RDI: 00000000181d99fa RBP: ffffc9000130ec30 R08: 000000007a8f96ff R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000022 R13: 0000000000000022 R14: 00000960ffffea00 R15: ffff88823b7e8378 FS: 000000c00002e890(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000960ffffea08 CR3: 0000000026518000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kasan_save_stack+0x32/0x40 mm/kasan/common.c:40 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357 ____kasan_slab_free mm/kasan/common.c:360 [inline] ____kasan_slab_free mm/kasan/common.c:325 [inline] __kasan_slab_free+0xfb/0x130 mm/kasan/common.c:368 kasan_slab_free include/linux/kasan.h:212 [inline] slab_free_hook mm/slub.c:1593 [inline] slab_free_freelist_hook+0xdf/0x240 mm/slub.c:1618 slab_free mm/slub.c:3178 [inline] kmem_cache_free+0x97/0x750 mm/slub.c:3194 kfree_skbmem+0xef/0x1b0 net/core/skbuff.c:684 __kfree_skb net/core/skbuff.c:741 [inline] consume_skb net/core/skbuff.c:896 [inline] consume_skb+0xcf/0x160 net/core/skbuff.c:890 __dev_kfree_skb_any+0x6b/0x80 net/core/dev.c:3194 dev_consume_skb_any include/linux/netdevice.h:3984 [inline] napi_consume_skb+0x27b/0x340 net/core/skbuff.c:951 free_old_xmit_skbs+0xe4/0x270 drivers/net/virtio_net.c:1457 start_xmit+0x144/0x16c0 drivers/net/virtio_net.c:1677 __netdev_start_xmit include/linux/netdevice.h:4944 [inline] netdev_start_xmit include/linux/netdevice.h:4958 [inline] xmit_one net/core/dev.c:3654 [inline] dev_hard_start_xmit+0x1eb/0x920 net/core/dev.c:3670 sch_direct_xmit+0x2e1/0xbd0 net/sched/sch_generic.c:313 qdisc_restart net/sched/sch_generic.c:376 [inline] __qdisc_run+0x4ba/0x15f0 net/sched/sch_generic.c:384 qdisc_run include/net/pkt_sched.h:136 [inline] qdisc_run include/net/pkt_sched.h:128 [inline] __dev_xmit_skb net/core/dev.c:3856 [inline] __dev_queue_xmit+0x1390/0x2e50 net/core/dev.c:4213 neigh_hh_output include/net/neighbour.h:499 [inline] neigh_output include/net/neighbour.h:508 [inline] ip_finish_output2+0xef0/0x2220 net/ipv4/ip_output.c:230 __ip_finish_output net/ipv4/ip_output.c:308 [inline] __ip_finish_output+0x396/0x640 net/ipv4/ip_output.c:290 ip_finish_output+0x35/0x200 net/ipv4/ip_output.c:318 NF_HOOK_COND include/linux/netfilter.h:290 [inline] ip_output+0x196/0x310 net/ipv4/ip_output.c:432 dst_output include/net/dst.h:448 [inline] ip_local_out net/ipv4/ip_output.c:126 [inline] __ip_queue_xmit+0x8d3/0x1a30 net/ipv4/ip_output.c:533 __tcp_transmit_skb+0x1889/0x38f0 net/ipv4/tcp_output.c:1405 __tcp_send_ack.part.0+0x3d6/0x7a0 net/ipv4/tcp_output.c:3970 __tcp_send_ack net/ipv4/tcp_output.c:3976 [inline] tcp_send_ack+0x7d/0xa0 net/ipv4/tcp_output.c:3976 tcp_cleanup_rbuf+0x46c/0x5b0 net/ipv4/tcp.c:1598 tcp_recvmsg_locked+0x7aa/0x22f0 net/ipv4/tcp.c:2520 tcp_recvmsg+0x134/0x550 net/ipv4/tcp.c:2550 inet_recvmsg+0x11b/0x5e0 net/ipv4/af_inet.c:852 sock_recvmsg_nosec net/socket.c:888 [inline] sock_recvmsg net/socket.c:906 [inline] sock_recvmsg net/socket.c:902 [inline] sock_read_iter+0x33c/0x470 net/socket.c:979 call_read_iter include/linux/fs.h:2108 [inline] new_sync_read+0x5b7/0x6e0 fs/read_write.c:415 vfs_read+0x35c/0x570 fs/read_write.c:496 ksys_read+0x1ee/0x250 fs/read_write.c:634 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4af19b Code: fb ff eb bd e8 a6 b6 fb ff e9 61 ff ff ff cc e8 9b 82 fb ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 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:000000c0002bb828 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 000000c00001c000 RCX: 00000000004af19b RDX: 0000000000001000 RSI: 000000c00067c000 RDI: 0000000000000006 RBP: 000000c0002bb878 R08: 0000000000000001 R09: 0000000000000002 R10: 00000000000046cc R11: 0000000000000212 R12: 00000000000046c8 R13: 0000000000000100 R14: 0000000000000008 R15: 0000000000000004 Modules linked in: CR2: 00000960ffffea08 ---[ end trace 2a3d8d8bb214e392 ]--- RIP: 0010:find_stack lib/stackdepot.c:209 [inline] RIP: 0010:stack_depot_save+0x12b/0x4e0 lib/stackdepot.c:281 Code: 05 7a 64 b8 0c 89 da 81 e2 ff ff 0f 00 4c 8d 3c d0 4d 8b 37 4d 85 f6 75 11 e9 94 00 00 00 4d 8b 36 4d 85 f6 0f 84 88 00 00 00 <41> 39 5e 08 75 ee 45 3b 66 0c 75 e8 31 c0 49 8b 4c c6 18 48 39 4c RSP: 0018:ffffc9000130ebc0 EFLAGS: 00010206 RAX: ffff88823b000000 RBX: 000000004cbfd06f RCX: 0000000000000002 RDX: 00000000000fd06f RSI: 0000000000000800 RDI: 00000000181d99fa RBP: ffffc9000130ec30 R08: 000000007a8f96ff R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000022 R13: 0000000000000022 R14: 00000960ffffea00 R15: ffff88823b7e8378 FS: 000000c00002e890(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000960ffffea08 CR3: 0000000026518000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400