general protection fault, probably for non-canonical address 0xdffffc000000000c: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000060-0x0000000000000067] CPU: 1 PID: 11362 Comm: syz.3.1506 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:kthread_destroy_worker+0x26/0xd0 kernel/kthread.c:1422 Code: 1f 44 00 00 f3 0f 1e fa 41 57 41 56 53 48 89 fb 49 bf 00 00 00 00 00 fc ff df e8 75 e9 2c 00 4c 8d 73 68 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 db 6a 85 00 4d 8b 36 4d 85 f6 74 RSP: 0018:ffffc900032f70b0 EFLAGS: 00010207 RAX: 000000000000000c RBX: fffffffffffffffc RCX: 0000000000080000 RDX: ffffc9000e35f000 RSI: 000000000000168f RDI: 0000000000001690 RBP: 0000000000000000 R08: ffff88807dd8803b R09: 1ffff1100fbb1007 R10: dffffc0000000000 R11: ffffed100fbb1008 R12: dffffc0000000000 R13: dffffc0000000000 R14: 0000000000000064 R15: dffffc0000000000 FS: 00007f0cca5076c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c4565f4 CR3: 0000000054e8f000 CR4: 00000000003506e0 Call Trace: vdpasim_free+0x56/0x430 drivers/vdpa/vdpa_sim/vdpa_sim.c:713 vdpa_release_dev+0x6c/0xf0 drivers/vdpa/vdpa.c:132 device_release+0xbc/0x1e0 drivers/base/core.c:-1 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x21b/0x450 lib/kobject.c:737 vdpasim_create+0x365/0x890 drivers/vdpa/vdpa_sim/vdpa_sim.c:274 vdpasim_blk_dev_add+0x11d/0x290 drivers/vdpa/vdpa_sim/vdpa_sim_blk.c:430 vdpa_nl_cmd_dev_add_set_doit+0xa85/0xbd0 drivers/vdpa/vdpa.c:698 genl_family_rcv_msg_doit+0x21a/0x310 net/netlink/genetlink.c:971 genl_family_rcv_msg net/netlink/genetlink.c:1051 [inline] genl_rcv_msg+0x611/0x7a0 net/netlink/genetlink.c:1066 netlink_rcv_skb+0x235/0x4c0 net/netlink/af_netlink.c:2550 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1075 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x7b1/0x930 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x8d0/0xbf0 net/netlink/af_netlink.c:1899 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0x61b/0x980 net/socket.c:2595 ___sys_sendmsg+0x2a6/0x360 net/socket.c:2649 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2687 [inline] __se_sys_sendmsg+0x1d0/0x2c0 net/socket.c:2685 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f0cc959e159 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f0cca507028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f0cc9826090 RCX: 00007f0cc959e159 RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000006 RBP: 00007f0cc963503b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0cc9826128 R14: 00007f0cc9826090 R15: 00007ffd7b6c3738 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:kthread_destroy_worker+0x26/0xd0 kernel/kthread.c:1422 Code: 1f 44 00 00 f3 0f 1e fa 41 57 41 56 53 48 89 fb 49 bf 00 00 00 00 00 fc ff df e8 75 e9 2c 00 4c 8d 73 68 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 db 6a 85 00 4d 8b 36 4d 85 f6 74 RSP: 0018:ffffc900032f70b0 EFLAGS: 00010207 RAX: 000000000000000c RBX: fffffffffffffffc RCX: 0000000000080000 RDX: ffffc9000e35f000 RSI: 000000000000168f RDI: 0000000000001690 RBP: 0000000000000000 R08: ffff88807dd8803b R09: 1ffff1100fbb1007 R10: dffffc0000000000 R11: ffffed100fbb1008 R12: dffffc0000000000 R13: dffffc0000000000 R14: 0000000000000064 R15: dffffc0000000000 FS: 00007f0cca5076c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c4565f4 CR3: 0000000054e8f000 CR4: 00000000003506e0 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 44 00 00 add %r8b,(%rax) 3: f3 0f 1e fa endbr64 7: 41 57 push %r15 9: 41 56 push %r14 b: 53 push %rbx c: 48 89 fb mov %rdi,%rbx f: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15 16: fc ff df 19: e8 75 e9 2c 00 call 0x2ce993 1e: 4c 8d 73 68 lea 0x68(%rbx),%r14 22: 4c 89 f0 mov %r14,%rax 25: 48 c1 e8 03 shr $0x3,%rax * 29: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 f7 mov %r14,%rdi 33: e8 db 6a 85 00 call 0x856b13 38: 4d 8b 36 mov (%r14),%r14 3b: 4d 85 f6 test %r14,%r14 3e: 74 .byte 0x74