Hello, syzbot found the following issue on: HEAD commit: 2205be537aeb Add linux-next specific files for 20230717 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=110613faa80000 kernel config: https://syzkaller.appspot.com/x/.config?x=173c0f005722ecc3 dashboard link: https://syzkaller.appspot.com/bug?extid=a8bd07230391c0c577c2 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10e4f18ea80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1480be3ea80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/30f27c4289e7/disk-2205be53.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/67e0e47344f7/vmlinux-2205be53.xz kernel image: https://storage.googleapis.com/syzbot-assets/e542d8c69716/bzImage-2205be53.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a8bd07230391c0c577c2@xxxxxxxxxxxxxxxxxxxxxxxxx iommufd_mock iommufd_mock0: Adding to iommu group 0 iommufd_mock iommufd_mock0: Removing from iommu group 0 general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] CPU: 0 PID: 5031 Comm: syz-executor409 Not tainted 6.5.0-rc1-next-20230717-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023 RIP: 0010:sysfs_remove_link_from_group+0x2b/0x80 fs/sysfs/group.c:413 Code: 0f 1e fa 41 54 49 89 d4 55 48 89 f5 53 48 89 fb e8 ba 13 73 ff 48 8d 7b 30 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 39 48 8b 7b 30 31 d2 48 89 ee e8 81 f2 fe ff 48 85 RSP: 0018:ffffc90003adfc18 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000006 RSI: ffffffff8213b9d6 RDI: 0000000000000030 RBP: ffffffff8adb0760 R08: 0000000000000001 R09: ffffed10280ca11b R10: ffff8881406508df R11: ffffffff8a345578 R12: ffff888022507500 R13: ffffffff8d519e20 R14: ffff888015ab8450 R15: ffff888015ab8448 FS: 00005555570f1380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000000 CR3: 00000000226b9000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> iommu_deinit_device+0x111/0x580 drivers/iommu/iommu.c:401 __iommu_group_remove_device+0x296/0x390 drivers/iommu/iommu.c:573 iommu_group_remove_device+0x7e/0xa0 drivers/iommu/iommu.c:1170 mock_dev_destroy drivers/iommu/iommufd/selftest.c:396 [inline] iommufd_test_mock_domain drivers/iommu/iommufd/selftest.c:452 [inline] iommufd_test+0x1b92/0x2c70 drivers/iommu/iommufd/selftest.c:950 iommufd_fops_ioctl+0x347/0x4d0 drivers/iommu/iommufd/main.c:337 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f732a69e2e9 Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe820edd58 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ffe820edf28 RCX: 00007f732a69e2e9 RDX: 0000000020000100 RSI: 0000000000003ba0 RDI: 0000000000000003 RBP: 00007f732a711610 R08: 0000000000000000 R09: 00007ffe820edf28 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffe820edf18 R14: 0000000000000001 R15: 0000000000000001 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:sysfs_remove_link_from_group+0x2b/0x80 fs/sysfs/group.c:413 Code: 0f 1e fa 41 54 49 89 d4 55 48 89 f5 53 48 89 fb e8 ba 13 73 ff 48 8d 7b 30 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 39 48 8b 7b 30 31 d2 48 89 ee e8 81 f2 fe ff 48 85 RSP: 0018:ffffc90003adfc18 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000006 RSI: ffffffff8213b9d6 RDI: 0000000000000030 RBP: ffffffff8adb0760 R08: 0000000000000001 R09: ffffed10280ca11b R10: ffff8881406508df R11: ffffffff8a345578 R12: ffff888022507500 R13: ffffffff8d519e20 R14: ffff888015ab8450 R15: ffff888015ab8448 FS: 00005555570f1380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055d13f5f7530 CR3: 00000000226b9000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 0f 1e fa nop %edx 3: 41 54 push %r12 5: 49 89 d4 mov %rdx,%r12 8: 55 push %rbp 9: 48 89 f5 mov %rsi,%rbp c: 53 push %rbx d: 48 89 fb mov %rdi,%rbx 10: e8 ba 13 73 ff call 0xff7313cf 15: 48 8d 7b 30 lea 0x30(%rbx),%rdi 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 75 39 jne 0x69 30: 48 8b 7b 30 mov 0x30(%rbx),%rdi 34: 31 d2 xor %edx,%edx 36: 48 89 ee mov %rbp,%rsi 39: e8 81 f2 fe ff call 0xfffef2bf 3e: 48 rex.W 3f: 85 .byte 0x85 --- 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@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the bug is already fixed, 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 change bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
