kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 20000 Comm: syz-executor5 Not tainted 4.19.0-rc3+ #10 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:rhashtable_walk_start_check+0xd3/0x13d0 lib/rhashtable.c:717 Code: f2 c7 40 30 f2 f2 f2 f2 c7 40 34 00 f2 f2 f2 65 48 8b 04 25 28 00 00 00 48 89 45 d0 31 c0 e8 b4 e7 ef fd 4c 89 e8 48 c1 e8 03 <80> 3c 18 00 0f 85 74 0f 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b RSP: 0018:ffff8801c7e2eee8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffc90005ceb000 RDX: 000000000000076a RSI: ffffffff838ee90c RDI: 0000000000000000 RBP: ffff8801c7e2f130 R08: ffff8801b5e12580 R09: ffffed0031f20dfc R10: ffffed0031f20dfc R11: ffff88018f906fe3 R12: 0000000000000000 R13: 0000000000000000 R14: ffff8801c7e2f270 R15: fffffffffffff000 FS: 00007f2b49c21700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000625208 CR3: 000000018af8e000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rhashtable_walk_start include/linux/rhashtable.h:244 [inline] tipc_nl_sk_walk+0x52/0x1d0 net/tipc/socket.c:3236 tipc_nl_sk_dump+0x24/0x30 net/tipc/socket.c:3366 __tipc_nl_compat_dumpit.isra.11+0x20b/0xad0 net/tipc/netlink_compat.c:192 tipc_nl_compat_dumpit+0x1f4/0x440 net/tipc/netlink_compat.c:265 tipc_nl_compat_handle net/tipc/netlink_compat.c:1142 [inline] tipc_nl_compat_recv+0x12b3/0x19a0 net/tipc/netlink_compat.c:1205 genl_family_rcv_msg+0x8a9/0x1140 net/netlink/genetlink.c:601 genl_rcv_msg+0xc6/0x168 net/netlink/genetlink.c:626 netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2454 genl_rcv+0x28/0x40 net/netlink/genetlink.c:637 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x5a5/0x760 net/netlink/af_netlink.c:1343 netlink_sendmsg+0xa18/0xfc0 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:631 ___sys_sendmsg+0x7fd/0x930 net/socket.c:2114 __sys_sendmsg+0x11d/0x280 net/socket.c:2152 __do_sys_sendmsg net/socket.c:2161 [inline] __se_sys_sendmsg net/socket.c:2159 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2159 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457099 Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f2b49c20c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f2b49c216d4 RCX: 0000000000457099 RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000003 RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d4bc0 R14: 00000000004c910b R15: 0000000000000000 Modules linked in: Dumping ftrace buffer: (ftrace buffer empty) kobject: 'loop1' (0000000071bcc0b3): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop6' (000000008f1168db): kobject_uevent_env kobject: 'loop6' (000000008f1168db): fill_kobj_path: path = '/devices/virtual/block/loop6' kobject: 'loop3' (00000000e2b92fbc): kobject_uevent_env kobject: 'loop1' (0000000071bcc0b3): kobject_uevent_env kobject: 'loop3' (00000000e2b92fbc): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop1' (0000000071bcc0b3): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop3' (00000000e2b92fbc): kobject_uevent_env kobject: 'loop3' (00000000e2b92fbc): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop4' (0000000076100677): kobject_uevent_env kobject: 'loop4' (0000000076100677): fill_kobj_path: path = '/devices/virtual/block/loop4' XFS (loop1): Invalid superblock magic number kobject: 'loop0' (000000000672fc95): kobject_uevent_env kobject: 'loop1' (0000000071bcc0b3): kobject_uevent_env kobject: 'loop1' (0000000071bcc0b3): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop0' (000000000672fc95): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop3' (00000000e2b92fbc): kobject_uevent_env kobject: 'loop1' (0000000071bcc0b3): kobject_uevent_env kobject: 'loop1' (0000000071bcc0b3): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop3' (00000000e2b92fbc): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop2' (0000000009f8c46f): kobject_uevent_env kobject: 'loop2' (0000000009f8c46f): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop0' (000000000672fc95): kobject_uevent_env kobject: 'loop0' (000000000672fc95): fill_kobj_path: path = '/devices/virtual/block/loop0' ---[ end trace a09dd2af4431822e ]--- kobject: 'loop1' (0000000071bcc0b3): kobject_uevent_env RIP: 0010:rhashtable_walk_start_check+0xd3/0x13d0 lib/rhashtable.c:717 kobject: 'loop1' (0000000071bcc0b3): fill_kobj_path: path = '/devices/virtual/block/loop1' Code: f2 c7 40 30 f2 f2 f2 f2 c7 40 34 00 f2 f2 f2 65 48 8b 04 25 28 00 00 00 48 89 45 d0 31 c0 e8 b4 e7 ef fd 4c 89 e8 48 c1 e8 03 <80> 3c 18 00 0f 85 74 0f 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b kobject: 'loop3' (00000000e2b92fbc): kobject_uevent_env kobject: 'loop3' (00000000e2b92fbc): fill_kobj_path: path = '/devices/virtual/block/loop3' RSP: 0018:ffff8801c7e2eee8 EFLAGS: 00010246 kobject: 'loop0' (000000000672fc95): kobject_uevent_env RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffc90005ceb000 kobject: 'loop0' (000000000672fc95): fill_kobj_path: path = '/devices/virtual/block/loop0' RDX: 000000000000076a RSI: ffffffff838ee90c RDI: 0000000000000000 kobject: 'loop3' (00000000e2b92fbc): kobject_uevent_env RBP: ffff8801c7e2f130 R08: ffff8801b5e12580 R09: ffffed0031f20dfc kobject: 'loop3' (00000000e2b92fbc): fill_kobj_path: path = '/devices/virtual/block/loop3' R10: ffffed0031f20dfc R11: ffff88018f906fe3 R12: 0000000000000000 R13: 0000000000000000 R14: ffff8801c7e2f270 R15: fffffffffffff000 FS: 00007f2b49c21700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000625208 CR3: 000000018af8e000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400