kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 19946 Comm: kworker/1:29 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events netlink_sock_destruct_work RIP: 0010:klist_iter_exit+0x21/0x80 lib/klist.c:314 Code: 66 0f 1f 84 00 00 00 00 00 41 54 55 53 48 89 fb e8 34 69 74 f9 48 8d 6b 08 48 b8 00 00 00 00 00 fc ff df 48 89 ea 48 c1 ea 03 <80> 3c 02 00 75 40 4c 8b 63 08 4d 85 e4 74 2e e8 0b 69 74 f9 31 f6 9pnet_virtio: no channels available for device 127.0.0.1 RSP: 0018:ffff88809b897c48 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000001 RSI: ffffffff87ee1c3c RDI: 0000000000000000 RBP: 0000000000000008 R08: 0000000000000000 R09: fffffbfff15cf8ac R10: ffffffff8ae7c567 R11: 0000000000000000 R12: 0000000000000000 R13: ffffffff896f11a0 R14: ffff8880ba12a8c0 R15: ffff8880ba12f000 FS: 0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CPU: 0 PID: 28932 Comm: syz-executor.5 Not tainted 4.19.211-syzkaller #0 CR2: 00007facbc163000 CR3: 00000000abcb9000 CR4: 00000000003406e0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 Call Trace: DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 Call Trace: fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0xa/0xf lib/fault-inject.c:149 nfc_device_iter_exit net/nfc/nfc.h:133 [inline] nfc_genl_dump_devices_done+0x31/0x50 net/nfc/netlink.c:658 genl_lock_done+0x82/0xc0 net/netlink/genetlink.c:495 __should_failslab+0x115/0x180 mm/failslab.c:32 netlink_sock_destruct+0x96/0x280 net/netlink/af_netlink.c:398 should_failslab+0x5/0x10 mm/slab_common.c:1590 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc_node mm/slab.c:3304 [inline] kmem_cache_alloc_node+0x245/0x3b0 mm/slab.c:3647 __sk_destruct+0x4b/0x8a0 net/core/sock.c:1576 __alloc_skb+0x71/0x560 net/core/skbuff.c:193 sk_destruct net/core/sock.c:1617 [inline] __sk_free+0x165/0x3b0 net/core/sock.c:1628 alloc_skb include/linux/skbuff.h:995 [inline] netlink_dump+0x55f/0xc10 net/netlink/af_netlink.c:2223 sk_free+0x3b/0x50 net/core/sock.c:1639 __netlink_dump_start+0x4e9/0x6f0 net/netlink/af_netlink.c:2338 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 genl_family_rcv_msg+0xa76/0xc40 net/netlink/genetlink.c:550 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Modules linked in: ---[ end trace 5af054029190ab05 ]--- genl_rcv_msg+0xbf/0x160 net/netlink/genetlink.c:627 netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2463 RIP: 0010:klist_iter_exit+0x21/0x80 lib/klist.c:314 genl_rcv+0x24/0x40 net/netlink/genetlink.c:638 netlink_unicast_kernel net/netlink/af_netlink.c:1325 [inline] netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1351 Code: 66 0f 1f 84 00 00 00 00 00 41 54 55 53 48 89 fb e8 34 69 74 f9 48 8d 6b 08 48 b8 00 00 00 00 00 fc ff df 48 89 ea 48 c1 ea 03 <80> 3c 02 00 75 40 4c 8b 63 08 4d 85 e4 74 2e e8 0b 69 74 f9 31 f6 netlink_sendmsg+0x6c3/0xc50 net/netlink/af_netlink.c:1917 RSP: 0018:ffff88809b897c48 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:661 ___sys_sendmsg+0x7bb/0x8e0 net/socket.c:2227 RDX: 0000000000000001 RSI: ffffffff87ee1c3c RDI: 0000000000000000 RBP: 0000000000000008 R08: 0000000000000000 R09: fffffbfff15cf8ac R10: ffffffff8ae7c567 R11: 0000000000000000 R12: 0000000000000000 R13: ffffffff896f11a0 R14: ffff8880ba12a8c0 R15: ffff8880ba12f000 __sys_sendmsg net/socket.c:2265 [inline] __do_sys_sendmsg net/socket.c:2274 [inline] __se_sys_sendmsg net/socket.c:2272 [inline] __x64_sys_sendmsg+0x132/0x220 net/socket.c:2272 FS: 0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f6a3708e049 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6a35a03168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f6a371a0f60 RCX: 00007f6a3708e049 RDX: 0000000000000000 RSI: 000000002000b580 RDI: 0000000000000004 9pnet_virtio: no channels available for device 127.0.0.1 RBP: 00007f6a35a031d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffc2a7309cf R14: 00007f6a35a03300 R15: 0000000000022000 CR2: 000055deb3aac287 CR3: 00000000b4a48000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 66 0f 1f 84 00 00 00 nopw 0x0(%rax,%rax,1) 7: 00 00 9: 41 54 push %r12 b: 55 push %rbp c: 53 push %rbx d: 48 89 fb mov %rdi,%rbx 10: e8 34 69 74 f9 callq 0xf9746949 15: 48 8d 6b 08 lea 0x8(%rbx),%rbp 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 23: 48 89 ea mov %rbp,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 75 40 jne 0x70 30: 4c 8b 63 08 mov 0x8(%rbx),%r12 34: 4d 85 e4 test %r12,%r12 37: 74 2e je 0x67 39: e8 0b 69 74 f9 callq 0xf9746949 3e: 31 f6 xor %esi,%esi