Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] CPU: 0 UID: 0 PID: 4715 Comm: syz.0.9421 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:can_rx_unregister+0x250/0x730 net/can/af_can.c:537 Code: 54 24 20 48 8d 84 24 b8 00 00 00 48 8d 74 24 78 48 8d 78 b0 e8 11 dc ff ff 48 ba 00 00 00 00 00 fc ff df 48 89 c1 48 c1 e9 03 <80> 3c 11 00 0f 85 7a 04 00 00 48 8b 18 44 8b 64 24 68 44 8b 74 24 RSP: 0018:ffffc9000584fba8 EFLAGS: 00010206 RAX: 0000000000000030 RBX: 0000000000000000 RCX: 0000000000000006 RDX: dffffc0000000000 RSI: ffffffff8a56c94b RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000005 R09: 00000000c00007ff R10: 00000000c00007ff R11: 0000000000000001 R12: ffff88808f3a8568 R13: ffff88807c774000 R14: 0000000000000002 R15: 1ffff92000b09f7c FS: 000055558d910500(0000) GS:ffff8881249d6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b327dfff8 CR3: 000000005b42d000 CR4: 00000000003526f0 Call Trace: isotp_release+0x937/0xb90 net/can/isotp.c:1213 __sock_release+0xb3/0x270 net/socket.c:662 sock_close+0x1c/0x30 net/socket.c:1455 __fput+0x402/0xb70 fs/file_table.c:468 task_work_run+0x150/0x240 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xec/0x130 kernel/entry/common.c:43 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x426/0xfa0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc323b8efc9 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffdf923ea98 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007fc323de7da0 RCX: 00007fc323b8efc9 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007fc323de7da0 R08: 00000000000427cc R09: 0000000ff923ed8f R10: 00007fc323de7cb0 R11: 0000000000000246 R12: 000000000021db0a R13: 00007fc323de6270 R14: ffffffffffffffff R15: 00007ffdf923ebb0 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:can_rx_unregister+0x250/0x730 net/can/af_can.c:537 Code: 54 24 20 48 8d 84 24 b8 00 00 00 48 8d 74 24 78 48 8d 78 b0 e8 11 dc ff ff 48 ba 00 00 00 00 00 fc ff df 48 89 c1 48 c1 e9 03 <80> 3c 11 00 0f 85 7a 04 00 00 48 8b 18 44 8b 64 24 68 44 8b 74 24 RSP: 0018:ffffc9000584fba8 EFLAGS: 00010206 RAX: 0000000000000030 RBX: 0000000000000000 RCX: 0000000000000006 RDX: dffffc0000000000 RSI: ffffffff8a56c94b RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000005 R09: 00000000c00007ff R10: 00000000c00007ff R11: 0000000000000001 R12: ffff88808f3a8568 R13: ffff88807c774000 R14: 0000000000000002 R15: 1ffff92000b09f7c FS: 000055558d910500(0000) GS:ffff8881249d6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b327dfff8 CR3: 000000005b42d000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 54 push %rsp 1: 24 20 and $0x20,%al 3: 48 8d 84 24 b8 00 00 lea 0xb8(%rsp),%rax a: 00 b: 48 8d 74 24 78 lea 0x78(%rsp),%rsi 10: 48 8d 78 b0 lea -0x50(%rax),%rdi 14: e8 11 dc ff ff call 0xffffdc2a 19: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 20: fc ff df 23: 48 89 c1 mov %rax,%rcx 26: 48 c1 e9 03 shr $0x3,%rcx * 2a: 80 3c 11 00 cmpb $0x0,(%rcx,%rdx,1) <-- trapping instruction 2e: 0f 85 7a 04 00 00 jne 0x4ae 34: 48 8b 18 mov (%rax),%rbx 37: 44 8b 64 24 68 mov 0x68(%rsp),%r12d 3c: 44 rex.R 3d: 8b .byte 0x8b 3e: 74 24 je 0x64