BUG: unable to handle page fault for address: 0000607ec40805e8 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP CPU: 0 PID: 10189 Comm: syz-executor.3 Not tainted 5.10.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:j1939_ndev_to_priv net/can/j1939/main.c:219 [inline] RIP: 0010:j1939_priv_get_by_ndev_locked+0x2b/0xa0 net/can/j1939/main.c:231 Code: 48 89 fb 48 83 ec 08 8b 05 ae 28 1d 02 85 c0 75 4a 31 c0 66 81 bb 44 02 00 00 18 01 75 37 48 8b 93 a0 05 00 00 48 85 d2 74 2b <48> 8b 82 28 60 00 00 48 85 c0 74 1f 48 8d b8 58 10 00 00 ba 01 00 RSP: 0018:ffffc90002d73d30 EFLAGS: 00010206 RAX: 0000000000000000 RBX: ffff88811f058000 RCX: 00000000ffffffff RDX: 0000607ec407a5c0 RSI: ffffffff844801bf RDI: ffffffff8458d67e RBP: ffff88811f058000 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000006 R13: ffffffff8506d060 R14: ffffffff85069e70 R15: 0000000000000006 FS: 00000000026d8940(0000) GS:ffff88813bc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000607ec40805e8 CR3: 000000011e8f7000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: j1939_priv_get_by_ndev net/can/j1939/main.c:243 [inline] j1939_netdev_notify+0x1e/0xa0 net/can/j1939/main.c:353 notifier_call_chain+0x2f/0x90 kernel/notifier.c:83 call_netdevice_notifiers_extack net/core/dev.c:2047 [inline] call_netdevice_notifiers net/core/dev.c:2061 [inline] rollback_registered_many+0x3a9/0x650 net/core/dev.c:9422 rollback_registered+0x51/0x90 net/core/dev.c:9467 unregister_netdevice_queue+0x6e/0xb0 net/core/dev.c:10622 unregister_netdevice include/linux/netdevice.h:2850 [inline] __tun_detach+0x4cf/0x5a0 drivers/net/tun.c:662 tun_detach drivers/net/tun.c:679 [inline] tun_chr_close+0x40/0xa0 drivers/net/tun.c:3337 __fput+0xaa/0x250 fs/file_table.c:281 task_work_run+0x68/0xb0 kernel/task_work.c:151 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop kernel/entry/common.c:164 [inline] exit_to_user_mode_prepare+0x1b5/0x1c0 kernel/entry/common.c:191 syscall_exit_to_user_mode+0x38/0x260 kernel/entry/common.c:266 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x417ab1 Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 a4 1a 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007fffdef26e00 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000417ab1 RDX: 0000001b2c420000 RSI: 0000000000000001 RDI: 0000000000000003 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 00007fffdef26ee0 R11: 0000000000000293 R12: 000000000119ca00 R13: 000000000119ca00 R14: 00000000000003e8 R15: 000000000119c034 Modules linked in: CR2: 0000607ec40805e8 ---[ end trace 5564c80a85b1bdc0 ]--- RIP: 0010:j1939_ndev_to_priv net/can/j1939/main.c:219 [inline] RIP: 0010:j1939_priv_get_by_ndev_locked+0x2b/0xa0 net/can/j1939/main.c:231 Code: 48 89 fb 48 83 ec 08 8b 05 ae 28 1d 02 85 c0 75 4a 31 c0 66 81 bb 44 02 00 00 18 01 75 37 48 8b 93 a0 05 00 00 48 85 d2 74 2b <48> 8b 82 28 60 00 00 48 85 c0 74 1f 48 8d b8 58 10 00 00 ba 01 00 RSP: 0018:ffffc90002d73d30 EFLAGS: 00010206 RAX: 0000000000000000 RBX: ffff88811f058000 RCX: 00000000ffffffff RDX: 0000607ec407a5c0 RSI: ffffffff844801bf RDI: ffffffff8458d67e RBP: ffff88811f058000 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000006 R13: ffffffff8506d060 R14: ffffffff85069e70 R15: 0000000000000006 FS: 00000000026d8940(0000) GS:ffff88813bc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000607ec40805e8 CR3: 000000011e8f7000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400