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Sat, 23 May 2026 17:38:26 -0700 (PDT) Date: Sat, 23 May 2026 17:38:26 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a124882.050a0220.30ba69.0009.GAE@google.com> Subject: [syzbot] [can?] general protection fault in can_rx_unregister (2) From: syzbot To: linux-can@vger.kernel.org, linux-kernel@vger.kernel.org, mkl@pengutronix.de, socketcan@hartkopp.net, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 4b4362973b6f Merge branch 'for-next/core' into for-kernelci git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=15e86d96580000 kernel config: https://syzkaller.appspot.com/x/.config?x=a834c6344141a58b dashboard link: https://syzkaller.appspot.com/bug?extid=8ed98cbd0161632bce95 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=111f147e580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17942ac8580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/f69f86c90ee5/disk-4b436297.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/79fa7b33aaab/vmlinux-4b436297.xz kernel image: https://storage.googleapis.com/syzbot-assets/ef080156d0de/Image-4b436297.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+8ed98cbd0161632bce95@syzkaller.appspotmail.com bond1: (slave vxcan3): Setting fail_over_mac to active for active-backup mode bond1: (slave vxcan3): making interface the new active one bond1: (slave vxcan3): Enslaving as an active interface with an up link Unable to handle kernel paging request at virtual address dfff800000000005 KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f] Mem abort info: ESR = 0x0000000096000005 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x05: level 1 translation fault Data abort info: ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [dfff800000000005] address between user and kernel address ranges Internal error: Oops: 0000000096000005 [#1] SMP Modules linked in: CPU: 0 UID: 0 PID: 4947 Comm: syz.0.86 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : can_rx_unregister+0x124/0x560 net/can/af_can.c:537 lr : can_rx_unregister+0x11c/0x560 net/can/af_can.c:531 sp : ffff800096267a40 x29: ffff800096267a60 x28: dfff800000000000 x27: ffff700012c4cf5c x26: ffff0000d755ae48 x25: ffff0000c5c9ec00 x24: 0000000000000000 x23: ffff80008597d660 x22: ffff0000d9aa8000 x21: ffff0000cc740000 x20: 0000000000000028 x19: ffff0000cc740108 x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 00000000ffff8000 x13: 0000000000000001 x12: 0000000000000004 x11: ffff700012c4cf30 x10: 0000000000ff0100 x9 : 0000000000000201 x8 : 0000000000000005 x7 : ffff80008594bef0 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80008594ba58 x2 : 0000000000000001 x1 : ffff0000d5110000 x0 : 0000000000000028 Call trace: can_rx_unregister+0x124/0x560 net/can/af_can.c:531 (P) isotp_release+0x500/0x9d8 net/can/isotp.c:1232 __sock_release+0xa0/0x1d4 net/socket.c:722 sock_close+0x24/0x38 net/socket.c:1514 __fput+0x340/0x744 fs/file_table.c:510 ____fput+0x20/0x30 fs/file_table.c:538 task_work_run+0x1c4/0x254 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:67 [inline] exit_to_user_mode_loop+0x10c/0x17c kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] arm64_syscall_exit_to_user_mode arch/arm64/kernel/entry-common.c:88 [inline] el0_svc+0x18c/0x260 arch/arm64/kernel/entry-common.c:741 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:759 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 Code: aa1803e2 97ffff00 d343fc08 aa0003f4 (387c6908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: aa1803e2 mov x2, x24 4: 97ffff00 bl 0xfffffffffffffc04 8: d343fc08 lsr x8, x0, #3 c: aa0003f4 mov x20, x0 * 10: 387c6908 ldrb w8, [x8, x28] <-- trapping instruction --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup