* [syzbot] [iommu?] WARNING in pt_iommu_amdv1_init @ 2026-03-24 0:04 syzbot 2026-03-24 14:37 ` Pranjal Shrivastava 2026-03-26 10:31 ` syzbot 0 siblings, 2 replies; 5+ messages in thread From: syzbot @ 2026-03-24 0:04 UTC (permalink / raw) To: iommu, jgg, joro, kevin.tian, linux-kernel, robin.murphy, syzkaller-bugs, will Hello, syzbot found the following issue on: HEAD commit: 0e4f8f1a3d08 Merge tag 'parisc-for-7.0-rc5' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=176df352580000 kernel config: https://syzkaller.appspot.com/x/.config?x=5a3e5e8c17cc174e dashboard link: https://syzkaller.appspot.com/bug?extid=453eb7add07c3767adab compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-0e4f8f1a.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/838ecdb7b55f/vmlinux-0e4f8f1a.xz kernel image: https://storage.googleapis.com/syzbot-assets/3742378914db/bzImage-0e4f8f1a.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+453eb7add07c3767adab@syzkaller.appspotmail.com iommufd_mock iommufd_mock1: Adding to iommu group 10 ------------[ cut here ]------------ !iommu_table->driver_ops || !iommu_table->driver_ops->change_top || !iommu_table->driver_ops->get_top_lock WARNING: drivers/iommu/generic_pt/fmt/../iommu_pt.h:1249 at pt_iommu_amdv1_init+0xa10/0xb20 drivers/iommu/generic_pt/iommu_pt.h:1249, CPU#1: syz.0.1303/9714 Modules linked in: CPU: 1 UID: 0 PID: 9714 Comm: syz.0.1303 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:pt_iommu_amdv1_init+0xa10/0xb20 drivers/iommu/generic_pt/iommu_pt.h:1249 Code: e8 95 a4 e7 fc e9 aa f6 ff ff e8 db 18 7b fc 89 ab 94 00 00 00 e9 15 ff ff ff e8 cb 18 7b fc e9 e4 fd ff ff e8 c1 18 7b fc 90 <0f> 0b 90 e9 19 ff ff ff bd a1 ff ff ff e9 cc fd ff ff 4c 89 cf 4c RSP: 0018:ffffc90003747a68 EFLAGS: 00010287 RAX: 00000000000007ee RBX: ffff88802bb03500 RCX: ffffc9000407a000 RDX: 0000000000080000 RSI: ffffffff858db73f RDI: ffff888026f94980 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000034 R11: 0000000000000000 R12: 0000000000000034 R13: 0000000000000040 R14: 0000000000000000 R15: 0000000000000034 FS: 00007f29a60136c0(0000) GS:ffff8880d6442000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c3f39c7 CR3: 000000003d1d7000 CR4: 0000000000352ef0 Call Trace: <TASK> mock_domain_alloc_pgtable drivers/iommu/iommufd/selftest.c:491 [inline] mock_domain_alloc_paging_flags+0x29b/0x680 drivers/iommu/iommufd/selftest.c:548 iommufd_hwpt_paging_alloc+0x393/0xb20 drivers/iommu/iommufd/hw_pagetable.c:149 iommufd_hwpt_alloc+0xb46/0x1af0 drivers/iommu/iommufd/hw_pagetable.c:369 iommufd_fops_ioctl+0x358/0x520 drivers/iommu/iommufd/main.c:533 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f29a519c799 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:00007f29a6013028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f29a5415fa0 RCX: 00007f29a519c799 RDX: 0000200000000200 RSI: 0000000000003b89 RDI: 0000000000000009 RBP: 00007f29a5232c99 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f29a5416038 R14: 00007f29a5415fa0 R15: 00007ffedd2b95c8 </TASK> --- 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 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 ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [syzbot] [iommu?] WARNING in pt_iommu_amdv1_init 2026-03-24 0:04 [syzbot] [iommu?] WARNING in pt_iommu_amdv1_init syzbot @ 2026-03-24 14:37 ` Pranjal Shrivastava 2026-03-25 5:19 ` Ankit Soni 2026-03-26 10:31 ` syzbot 1 sibling, 1 reply; 5+ messages in thread From: Pranjal Shrivastava @ 2026-03-24 14:37 UTC (permalink / raw) To: syzbot Cc: iommu, jgg, joro, kevin.tian, linux-kernel, robin.murphy, syzkaller-bugs, will On Mon, Mar 23, 2026 at 05:04:27PM -0700, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 0e4f8f1a3d08 Merge tag 'parisc-for-7.0-rc5' of git://git.k.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=176df352580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=5a3e5e8c17cc174e > dashboard link: https://syzkaller.appspot.com/bug?extid=453eb7add07c3767adab > compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 > > Unfortunately, I don't have any reproducer for this issue yet. > > Downloadable assets: > disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-0e4f8f1a.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/838ecdb7b55f/vmlinux-0e4f8f1a.xz > kernel image: https://storage.googleapis.com/syzbot-assets/3742378914db/bzImage-0e4f8f1a.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+453eb7add07c3767adab@syzkaller.appspotmail.com > > iommufd_mock iommufd_mock1: Adding to iommu group 10 > ------------[ cut here ]------------ > !iommu_table->driver_ops || !iommu_table->driver_ops->change_top || !iommu_table->driver_ops->get_top_lock > WARNING: drivers/iommu/generic_pt/fmt/../iommu_pt.h:1249 at pt_iommu_amdv1_init+0xa10/0xb20 drivers/iommu/generic_pt/iommu_pt.h:1249, CPU#1: syz.0.1303/9714 > Modules linked in: > CPU: 1 UID: 0 PID: 9714 Comm: syz.0.1303 Tainted: G L syzkaller #0 PREEMPT(full) > Tainted: [L]=SOFTLOCKUP > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 > RIP: 0010:pt_iommu_amdv1_init+0xa10/0xb20 drivers/iommu/generic_pt/iommu_pt.h:1249 > Code: e8 95 a4 e7 fc e9 aa f6 ff ff e8 db 18 7b fc 89 ab 94 00 00 00 e9 15 ff ff ff e8 cb 18 7b fc e9 e4 fd ff ff e8 c1 18 7b fc 90 <0f> 0b 90 e9 19 ff ff ff bd a1 ff ff ff e9 cc fd ff ff 4c 89 cf 4c > RSP: 0018:ffffc90003747a68 EFLAGS: 00010287 > RAX: 00000000000007ee RBX: ffff88802bb03500 RCX: ffffc9000407a000 > RDX: 0000000000080000 RSI: ffffffff858db73f RDI: ffff888026f94980 > RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 > R10: 0000000000000034 R11: 0000000000000000 R12: 0000000000000034 > R13: 0000000000000040 R14: 0000000000000000 R15: 0000000000000034 > FS: 00007f29a60136c0(0000) GS:ffff8880d6442000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 000000110c3f39c7 CR3: 000000003d1d7000 CR4: 0000000000352ef0 > Call Trace: > <TASK> > mock_domain_alloc_pgtable drivers/iommu/iommufd/selftest.c:491 [inline] > mock_domain_alloc_paging_flags+0x29b/0x680 drivers/iommu/iommufd/selftest.c:548 > iommufd_hwpt_paging_alloc+0x393/0xb20 drivers/iommu/iommufd/hw_pagetable.c:149 > iommufd_hwpt_alloc+0xb46/0x1af0 drivers/iommu/iommufd/hw_pagetable.c:369 > iommufd_fops_ioctl+0x358/0x520 drivers/iommu/iommufd/main.c:533 > vfs_ioctl fs/ioctl.c:51 [inline] > __do_sys_ioctl fs/ioctl.c:597 [inline] > __se_sys_ioctl fs/ioctl.c:583 [inline] > __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7f29a519c799 > 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:00007f29a6013028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 > RAX: ffffffffffffffda RBX: 00007f29a5415fa0 RCX: 00007f29a519c799 > RDX: 0000200000000200 RSI: 0000000000003b89 RDI: 0000000000000009 > RBP: 00007f29a5232c99 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 > R13: 00007f29a5416038 R14: 00007f29a5415fa0 R15: 00007ffedd2b95c8 > </TASK> > > I believe this is because we don't populate struct pt_iommu_driver_ops for the "mock" iommu / selftest? Would defining mock ops help fix this? I have a patch that seems to fix the WARN_ON: diff --git a/drivers/iommu/iommufd/selftest.c b/drivers/iommu/iommufd/selftest.c index 9607416f8069..1599eb737d2a 100644 --- a/drivers/iommu/iommufd/selftest.c +++ b/drivers/iommu/iommufd/selftest.c @@ -119,6 +119,7 @@ struct mock_iommu_domain { struct pt_iommu_amdv1 amdv1; }; unsigned long flags; + spinlock_t lock; }; PT_IOMMU_CHECK_DOMAIN(struct mock_iommu_domain, iommu, domain); PT_IOMMU_CHECK_DOMAIN(struct mock_iommu_domain, amdv1.iommu, domain); @@ -129,6 +130,29 @@ to_mock_domain(struct iommu_domain *domain) return container_of(domain, struct mock_iommu_domain, domain); } +static void mock_domain_change_top(struct pt_iommu *iommu_table, + phys_addr_t top_paddr, + unsigned int top_level) +{ + /* + * The selftest doesn't have real hardware, so there is no need to + * perform any root table moves. + */ +} + +static spinlock_t *mock_domain_get_top_lock(struct pt_iommu *iommu_table) +{ + struct mock_iommu_domain *mock = + container_of(iommu_table, struct mock_iommu_domain, iommu); + + return &mock->lock; +} + +static const struct pt_iommu_driver_ops mock_driver_ops = { + .change_top = &mock_domain_change_top, + .get_top_lock = &mock_domain_get_top_lock, +}; + struct mock_iommu_domain_nested { struct iommu_domain domain; struct mock_viommu *mock_viommu; @@ -445,6 +469,8 @@ mock_domain_alloc_pgtable(struct device *dev, if (!mock) return ERR_PTR(-ENOMEM); mock->domain.type = IOMMU_DOMAIN_UNMANAGED; + spin_lock_init(&mock->lock); + mock->amdv1.iommu.driver_ops = &mock_driver_ops; mock->amdv1.iommu.nid = NUMA_NO_NODE; LMK, if I shall send this as a separate patch? Thanks, Praan ^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [syzbot] [iommu?] WARNING in pt_iommu_amdv1_init 2026-03-24 14:37 ` Pranjal Shrivastava @ 2026-03-25 5:19 ` Ankit Soni 2026-03-25 9:42 ` Pranjal Shrivastava 0 siblings, 1 reply; 5+ messages in thread From: Ankit Soni @ 2026-03-25 5:19 UTC (permalink / raw) To: Pranjal Shrivastava Cc: syzbot, iommu, jgg, joro, kevin.tian, linux-kernel, robin.murphy, syzkaller-bugs, will On Tue, Mar 24, 2026 at 02:37:41PM +0000, Pranjal Shrivastava wrote: > On Mon, Mar 23, 2026 at 05:04:27PM -0700, syzbot wrote: > > Hello, > > > > syzbot found the following issue on: > > > > HEAD commit: 0e4f8f1a3d08 Merge tag 'parisc-for-7.0-rc5' of git://git.k.. > > git tree: upstream > > console output: https://syzkaller.appspot.com/x/log.txt?x=176df352580000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=5a3e5e8c17cc174e > > dashboard link: https://syzkaller.appspot.com/bug?extid=453eb7add07c3767adab > > compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 > > > > Unfortunately, I don't have any reproducer for this issue yet. > > > > Downloadable assets: > > disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-0e4f8f1a.raw.xz > > vmlinux: https://storage.googleapis.com/syzbot-assets/838ecdb7b55f/vmlinux-0e4f8f1a.xz > > kernel image: https://storage.googleapis.com/syzbot-assets/3742378914db/bzImage-0e4f8f1a.xz > > > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > > Reported-by: syzbot+453eb7add07c3767adab@syzkaller.appspotmail.com > > > > iommufd_mock iommufd_mock1: Adding to iommu group 10 > > ------------[ cut here ]------------ > > !iommu_table->driver_ops || !iommu_table->driver_ops->change_top || !iommu_table->driver_ops->get_top_lock > > WARNING: drivers/iommu/generic_pt/fmt/../iommu_pt.h:1249 at pt_iommu_amdv1_init+0xa10/0xb20 drivers/iommu/generic_pt/iommu_pt.h:1249, CPU#1: syz.0.1303/9714 > > Modules linked in: > > CPU: 1 UID: 0 PID: 9714 Comm: syz.0.1303 Tainted: G L syzkaller #0 PREEMPT(full) > > Tainted: [L]=SOFTLOCKUP > > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 > > RIP: 0010:pt_iommu_amdv1_init+0xa10/0xb20 drivers/iommu/generic_pt/iommu_pt.h:1249 > > Code: e8 95 a4 e7 fc e9 aa f6 ff ff e8 db 18 7b fc 89 ab 94 00 00 00 e9 15 ff ff ff e8 cb 18 7b fc e9 e4 fd ff ff e8 c1 18 7b fc 90 <0f> 0b 90 e9 19 ff ff ff bd a1 ff ff ff e9 cc fd ff ff 4c 89 cf 4c > > RSP: 0018:ffffc90003747a68 EFLAGS: 00010287 > > RAX: 00000000000007ee RBX: ffff88802bb03500 RCX: ffffc9000407a000 > > RDX: 0000000000080000 RSI: ffffffff858db73f RDI: ffff888026f94980 > > RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 > > R10: 0000000000000034 R11: 0000000000000000 R12: 0000000000000034 > > R13: 0000000000000040 R14: 0000000000000000 R15: 0000000000000034 > > FS: 00007f29a60136c0(0000) GS:ffff8880d6442000(0000) knlGS:0000000000000000 > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > CR2: 000000110c3f39c7 CR3: 000000003d1d7000 CR4: 0000000000352ef0 > > Call Trace: > > <TASK> > > mock_domain_alloc_pgtable drivers/iommu/iommufd/selftest.c:491 [inline] > > mock_domain_alloc_paging_flags+0x29b/0x680 drivers/iommu/iommufd/selftest.c:548 > > iommufd_hwpt_paging_alloc+0x393/0xb20 drivers/iommu/iommufd/hw_pagetable.c:149 > > iommufd_hwpt_alloc+0xb46/0x1af0 drivers/iommu/iommufd/hw_pagetable.c:369 > > iommufd_fops_ioctl+0x358/0x520 drivers/iommu/iommufd/main.c:533 > > vfs_ioctl fs/ioctl.c:51 [inline] > > __do_sys_ioctl fs/ioctl.c:597 [inline] > > __se_sys_ioctl fs/ioctl.c:583 [inline] > > __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 > > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > > do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94 > > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > RIP: 0033:0x7f29a519c799 > > 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:00007f29a6013028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 > > RAX: ffffffffffffffda RBX: 00007f29a5415fa0 RCX: 00007f29a519c799 > > RDX: 0000200000000200 RSI: 0000000000003b89 RDI: 0000000000000009 > > RBP: 00007f29a5232c99 R08: 0000000000000000 R09: 0000000000000000 > > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 > > R13: 00007f29a5416038 R14: 00007f29a5415fa0 R15: 00007ffedd2b95c8 > > </TASK> > > > > > > I believe this is because we don't populate struct pt_iommu_driver_ops > for the "mock" iommu / selftest? Would defining mock ops help fix this? > > I have a patch that seems to fix the WARN_ON: > > diff --git a/drivers/iommu/iommufd/selftest.c b/drivers/iommu/iommufd/selftest.c > index 9607416f8069..1599eb737d2a 100644 > --- a/drivers/iommu/iommufd/selftest.c > +++ b/drivers/iommu/iommufd/selftest.c > @@ -119,6 +119,7 @@ struct mock_iommu_domain { > struct pt_iommu_amdv1 amdv1; > }; > unsigned long flags; > + spinlock_t lock; May be top_lock for consistency with kunit? Otherwise looks good to me. -Ankit > }; > PT_IOMMU_CHECK_DOMAIN(struct mock_iommu_domain, iommu, domain); > PT_IOMMU_CHECK_DOMAIN(struct mock_iommu_domain, amdv1.iommu, domain); > @@ -129,6 +130,29 @@ to_mock_domain(struct iommu_domain *domain) > return container_of(domain, struct mock_iommu_domain, domain); > } > > +static void mock_domain_change_top(struct pt_iommu *iommu_table, > + phys_addr_t top_paddr, > + unsigned int top_level) > +{ > + /* > + * The selftest doesn't have real hardware, so there is no need to > + * perform any root table moves. > + */ > +} > + > +static spinlock_t *mock_domain_get_top_lock(struct pt_iommu *iommu_table) > +{ > + struct mock_iommu_domain *mock = > + container_of(iommu_table, struct mock_iommu_domain, iommu); > + > + return &mock->lock; > +} > + > +static const struct pt_iommu_driver_ops mock_driver_ops = { > + .change_top = &mock_domain_change_top, > + .get_top_lock = &mock_domain_get_top_lock, > +}; > + > struct mock_iommu_domain_nested { > struct iommu_domain domain; > struct mock_viommu *mock_viommu; > @@ -445,6 +469,8 @@ mock_domain_alloc_pgtable(struct device *dev, > if (!mock) > return ERR_PTR(-ENOMEM); > mock->domain.type = IOMMU_DOMAIN_UNMANAGED; > + spin_lock_init(&mock->lock); > + mock->amdv1.iommu.driver_ops = &mock_driver_ops; > > mock->amdv1.iommu.nid = NUMA_NO_NODE; > > > LMK, if I shall send this as a separate patch? > > Thanks, > Praan ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [syzbot] [iommu?] WARNING in pt_iommu_amdv1_init 2026-03-25 5:19 ` Ankit Soni @ 2026-03-25 9:42 ` Pranjal Shrivastava 0 siblings, 0 replies; 5+ messages in thread From: Pranjal Shrivastava @ 2026-03-25 9:42 UTC (permalink / raw) To: Ankit Soni Cc: syzbot, iommu, jgg, joro, kevin.tian, linux-kernel, robin.murphy, syzkaller-bugs, will On Wed, Mar 25, 2026 at 05:19:51AM +0000, Ankit Soni wrote: > On Tue, Mar 24, 2026 at 02:37:41PM +0000, Pranjal Shrivastava wrote: > > On Mon, Mar 23, 2026 at 05:04:27PM -0700, syzbot wrote: > > > Hello, > > > > > > syzbot found the following issue on: > > > > > > HEAD commit: 0e4f8f1a3d08 Merge tag 'parisc-for-7.0-rc5' of git://git.k.. > > > git tree: upstream > > > console output: https://syzkaller.appspot.com/x/log.txt?x=176df352580000 > > > kernel config: https://syzkaller.appspot.com/x/.config?x=5a3e5e8c17cc174e > > > dashboard link: https://syzkaller.appspot.com/bug?extid=453eb7add07c3767adab > > > compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 > > > > > > Unfortunately, I don't have any reproducer for this issue yet. > > > > > > Downloadable assets: > > > disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-0e4f8f1a.raw.xz > > > vmlinux: https://storage.googleapis.com/syzbot-assets/838ecdb7b55f/vmlinux-0e4f8f1a.xz > > > kernel image: https://storage.googleapis.com/syzbot-assets/3742378914db/bzImage-0e4f8f1a.xz > > > > > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > > > Reported-by: syzbot+453eb7add07c3767adab@syzkaller.appspotmail.com > > > > > > iommufd_mock iommufd_mock1: Adding to iommu group 10 > > > ------------[ cut here ]------------ > > > !iommu_table->driver_ops || !iommu_table->driver_ops->change_top || !iommu_table->driver_ops->get_top_lock > > > WARNING: drivers/iommu/generic_pt/fmt/../iommu_pt.h:1249 at pt_iommu_amdv1_init+0xa10/0xb20 drivers/iommu/generic_pt/iommu_pt.h:1249, CPU#1: syz.0.1303/9714 > > > Modules linked in: > > > CPU: 1 UID: 0 PID: 9714 Comm: syz.0.1303 Tainted: G L syzkaller #0 PREEMPT(full) > > > Tainted: [L]=SOFTLOCKUP > > > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 > > > RIP: 0010:pt_iommu_amdv1_init+0xa10/0xb20 drivers/iommu/generic_pt/iommu_pt.h:1249 > > > Code: e8 95 a4 e7 fc e9 aa f6 ff ff e8 db 18 7b fc 89 ab 94 00 00 00 e9 15 ff ff ff e8 cb 18 7b fc e9 e4 fd ff ff e8 c1 18 7b fc 90 <0f> 0b 90 e9 19 ff ff ff bd a1 ff ff ff e9 cc fd ff ff 4c 89 cf 4c > > > RSP: 0018:ffffc90003747a68 EFLAGS: 00010287 > > > RAX: 00000000000007ee RBX: ffff88802bb03500 RCX: ffffc9000407a000 > > > RDX: 0000000000080000 RSI: ffffffff858db73f RDI: ffff888026f94980 > > > RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 > > > R10: 0000000000000034 R11: 0000000000000000 R12: 0000000000000034 > > > R13: 0000000000000040 R14: 0000000000000000 R15: 0000000000000034 > > > FS: 00007f29a60136c0(0000) GS:ffff8880d6442000(0000) knlGS:0000000000000000 > > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > > CR2: 000000110c3f39c7 CR3: 000000003d1d7000 CR4: 0000000000352ef0 > > > Call Trace: > > > <TASK> > > > mock_domain_alloc_pgtable drivers/iommu/iommufd/selftest.c:491 [inline] > > > mock_domain_alloc_paging_flags+0x29b/0x680 drivers/iommu/iommufd/selftest.c:548 > > > iommufd_hwpt_paging_alloc+0x393/0xb20 drivers/iommu/iommufd/hw_pagetable.c:149 > > > iommufd_hwpt_alloc+0xb46/0x1af0 drivers/iommu/iommufd/hw_pagetable.c:369 > > > iommufd_fops_ioctl+0x358/0x520 drivers/iommu/iommufd/main.c:533 > > > vfs_ioctl fs/ioctl.c:51 [inline] > > > __do_sys_ioctl fs/ioctl.c:597 [inline] > > > __se_sys_ioctl fs/ioctl.c:583 [inline] > > > __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 > > > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > > > do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94 > > > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > > RIP: 0033:0x7f29a519c799 > > > 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:00007f29a6013028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 > > > RAX: ffffffffffffffda RBX: 00007f29a5415fa0 RCX: 00007f29a519c799 > > > RDX: 0000200000000200 RSI: 0000000000003b89 RDI: 0000000000000009 > > > RBP: 00007f29a5232c99 R08: 0000000000000000 R09: 0000000000000000 > > > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 > > > R13: 00007f29a5416038 R14: 00007f29a5415fa0 R15: 00007ffedd2b95c8 > > > </TASK> > > > > > > > > > > I believe this is because we don't populate struct pt_iommu_driver_ops > > for the "mock" iommu / selftest? Would defining mock ops help fix this? > > > > I have a patch that seems to fix the WARN_ON: > > > > diff --git a/drivers/iommu/iommufd/selftest.c b/drivers/iommu/iommufd/selftest.c > > index 9607416f8069..1599eb737d2a 100644 > > --- a/drivers/iommu/iommufd/selftest.c > > +++ b/drivers/iommu/iommufd/selftest.c > > @@ -119,6 +119,7 @@ struct mock_iommu_domain { > > struct pt_iommu_amdv1 amdv1; > > }; > > unsigned long flags; > > + spinlock_t lock; > > May be top_lock for consistency with kunit? > Otherwise looks good to me. > > -Ankit > Ack. Sure, I'll send out a patch. Thanks! Thanks, Praan ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [syzbot] [iommu?] WARNING in pt_iommu_amdv1_init 2026-03-24 0:04 [syzbot] [iommu?] WARNING in pt_iommu_amdv1_init syzbot 2026-03-24 14:37 ` Pranjal Shrivastava @ 2026-03-26 10:31 ` syzbot 1 sibling, 0 replies; 5+ messages in thread From: syzbot @ 2026-03-26 10:31 UTC (permalink / raw) To: ankit.soni, iommu, jgg, joro, kevin.tian, linux-kernel, praan, robin.murphy, skhawaja, syzkaller-bugs, will syzbot has found a reproducer for the following issue on: HEAD commit: d2a43e7f89da Merge tag 'hardening-v7.0-rc6' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12f4d06a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d46eab0cfd31c214 dashboard link: https://syzkaller.appspot.com/bug?extid=453eb7add07c3767adab compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12cfa1d6580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13beecca580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-d2a43e7f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/971507ed4baf/vmlinux-d2a43e7f.xz kernel image: https://storage.googleapis.com/syzbot-assets/c5926dab5b8b/bzImage-d2a43e7f.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+453eb7add07c3767adab@syzkaller.appspotmail.com iommufd_mock iommufd_mock0: Adding to iommu group 11 ------------[ cut here ]------------ !iommu_table->driver_ops || !iommu_table->driver_ops->change_top || !iommu_table->driver_ops->get_top_lock WARNING: drivers/iommu/generic_pt/fmt/../iommu_pt.h:1251 at pt_iommu_amdv1_init+0x631/0x9f0 drivers/iommu/generic_pt/iommu_pt.h:1249, CPU#0: syz.0.17/5472 Modules linked in: CPU: 0 UID: 0 PID: 5472 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:pt_iommu_amdv1_init+0x631/0x9f0 drivers/iommu/generic_pt/iommu_pt.h:1249 Code: 48 89 df 44 89 fa e8 de 05 00 00 48 89 c3 48 3d 01 f0 ff ff 72 1e e8 de 77 6f fc eb 5e e8 d7 77 6f fc eb 05 e8 d0 77 6f fc 90 <0f> 0b 90 bb ea ff ff ff eb 47 e8 c0 77 6f fc 43 80 7c 35 00 00 74 RSP: 0018:ffffc9000e277a20 EFLAGS: 00010293 RAX: ffffffff855639f9 RBX: 0000000000000000 RCX: ffff8880369c24c0 RDX: 0000000000000000 RSI: 0000000000000034 RDI: 0000000000000000 RBP: ffff8880540f4f70 R08: ffff8880540f4f97 R09: 0000000000000000 R10: ffff8880540f4f68 R11: ffffed100a81e9f3 R12: ffff8880540f4f88 R13: 1ffff1100a81e9f1 R14: dffffc0000000000 R15: 0000000000000cc0 FS: 000055558cba0500(0000) GS:ffff88808ca51000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000037dbd000 CR4: 0000000000352ef0 Call Trace: <TASK> mock_domain_alloc_pgtable drivers/iommu/iommufd/selftest.c:491 [inline] mock_domain_alloc_paging_flags+0x3ba/0x780 drivers/iommu/iommufd/selftest.c:548 iommufd_hwpt_paging_alloc+0x3ab/0x830 drivers/iommu/iommufd/hw_pagetable.c:149 iommufd_hwpt_alloc+0x496/0xc10 drivers/iommu/iommufd/hw_pagetable.c:369 iommufd_fops_ioctl+0x4b5/0x5d0 drivers/iommu/iommufd/main.c:533 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7b6999c799 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:00007ffd240fb7c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f7b69c15fa0 RCX: 00007f7b6999c799 RDX: 0000200000000200 RSI: 0000000000003b89 RDI: 0000000000000008 RBP: 00007f7b69a32c99 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7b69c15fac R14: 00007f7b69c15fa0 R15: 00007f7b69c15fa0 </TASK> --- 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. ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2026-03-26 10:31 UTC | newest] Thread overview: 5+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2026-03-24 0:04 [syzbot] [iommu?] WARNING in pt_iommu_amdv1_init syzbot 2026-03-24 14:37 ` Pranjal Shrivastava 2026-03-25 5:19 ` Ankit Soni 2026-03-25 9:42 ` Pranjal Shrivastava 2026-03-26 10:31 ` syzbot
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox