From: syzbot <syzbot+e06bb7478e687f235ad7@syzkaller.appspotmail.com>
To: iommu@lists.linux.dev, joro@8bytes.org,
linux-kernel@vger.kernel.org, robin.murphy@arm.com,
syzkaller-bugs@googlegroups.com, will@kernel.org
Subject: [syzbot] [iommu?] kernel BUG in iommu_pages_start_incoherent
Date: Wed, 10 Dec 2025 19:26:22 -0800 [thread overview]
Message-ID: <693a39de.050a0220.4004e.02ce.GAE@google.com> (raw)
Hello,
syzbot found the following issue on:
HEAD commit: c06c303832ec ocfs2: fix xattr array entry __counted_by error
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=175a2992580000
kernel config: https://syzkaller.appspot.com/x/.config?x=d3ce1cfe3996fc8b
dashboard link: https://syzkaller.appspot.com/bug?extid=e06bb7478e687f235ad7
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
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-c06c3038.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/aa14148a2ef4/vmlinux-c06c3038.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d2d5f3a106bf/bzImage-c06c3038.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e06bb7478e687f235ad7@syzkaller.appspotmail.com
Call Trace:
<TASK>
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
fail_dump lib/fault-inject.c:73 [inline]
should_fail_ex+0x414/0x560 lib/fault-inject.c:174
prepare_alloc_pages+0x22b/0x650 mm/page_alloc.c:4985
__alloc_frozen_pages_noprof+0x123/0x370 mm/page_alloc.c:5199
__alloc_pages_noprof mm/page_alloc.c:5244 [inline]
__folio_alloc_noprof+0x18/0x120 mm/page_alloc.c:5254
__folio_alloc_node_noprof include/linux/gfp.h:296 [inline]
iommu_alloc_pages_node_sz+0x152/0x320 drivers/iommu/iommu-pages.c:66
_table_alloc drivers/iommu/generic_pt/iommu_pt.h:373 [inline]
table_alloc drivers/iommu/generic_pt/iommu_pt.h:408 [inline]
pt_iommu_new_table drivers/iommu/generic_pt/iommu_pt.h:424 [inline]
__map_range+0x1f2/0xa80 drivers/iommu/generic_pt/iommu_pt.h:584
pt_descend drivers/iommu/generic_pt/pt_iter.h:391 [inline]
__map_range+0x511/0xa80 drivers/iommu/generic_pt/iommu_pt.h:619
pt_descend drivers/iommu/generic_pt/pt_iter.h:391 [inline]
__map_range+0x511/0xa80 drivers/iommu/generic_pt/iommu_pt.h:619
pt_iommu_vtdss_map_pages+0x6a3/0x960 drivers/iommu/generic_pt/iommu_pt.h:905
iommu_map_nosync+0x30a/0x840 drivers/iommu/iommu.c:2549
iommu_map_sg+0x579/0xae0 drivers/iommu/iommu.c:2721
iommu_dma_map_sg+0x908/0x1000 drivers/iommu/dma-iommu.c:1493
__dma_map_sg_attrs+0xd0/0x520 kernel/dma/mapping.c:245
dma_map_sg_attrs+0x32/0x50 kernel/dma/mapping.c:284
ata_sg_setup drivers/ata/libata-core.c:4773 [inline]
ata_qc_issue+0x515/0xf30 drivers/ata/libata-core.c:5085
ata_scsi_translate drivers/ata/libata-scsi.c:1755 [inline]
__ata_scsi_queuecmd+0x957/0xf60 drivers/ata/libata-scsi.c:4355
ata_scsi_queuecmd+0x3d4/0x5c0 drivers/ata/libata-scsi.c:4400
scsi_dispatch_cmd drivers/scsi/scsi_lib.c:1638 [inline]
scsi_queue_rq+0x18bc/0x30d0 drivers/scsi/scsi_lib.c:1895
blk_mq_dispatch_rq_list+0x4c0/0x1900 block/blk-mq.c:2137
__blk_mq_do_dispatch_sched block/blk-mq-sched.c:168 [inline]
blk_mq_do_dispatch_sched block/blk-mq-sched.c:182 [inline]
__blk_mq_sched_dispatch_requests+0xdac/0x1570 block/blk-mq-sched.c:307
blk_mq_sched_dispatch_requests+0xd7/0x190 block/blk-mq-sched.c:329
blk_mq_run_hw_queue+0x404/0x4f0 block/blk-mq.c:2375
blk_mq_dispatch_list+0xd0b/0xe00 include/linux/spinlock.h:-1
blk_mq_flush_plug_list+0x469/0x550 block/blk-mq.c:2986
blk_add_rq_to_plug+0x175/0x450 block/blk-mq.c:1407
blk_mq_submit_bio+0xd5b/0x26b0 block/blk-mq.c:3232
__submit_bio+0x207/0x5a0 block/blk-core.c:637
__submit_bio_noacct_mq block/blk-core.c:724 [inline]
submit_bio_noacct_nocheck+0x377/0xa30 block/blk-core.c:755
__blkdev_direct_IO+0x915/0xf90 block/fops.c:264
blkdev_direct_IO+0x1261/0x17e0 block/fops.c:441
blkdev_direct_write+0x7c/0x140 block/fops.c:727
blkdev_write_iter+0x547/0x710 block/fops.c:795
do_iter_readv_writev+0x623/0x8c0 fs/read_write.c:-1
vfs_writev+0x31a/0x960 fs/read_write.c:1057
do_writev+0x14d/0x2d0 fs/read_write.c:1103
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fae01b8f7c9
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:00007fae02b02038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007fae01de5fa0 RCX: 00007fae01b8f7c9
RDX: 0000000000000021 RSI: 0000200000000a40 RDI: 0000000000000004
RBP: 00007fae02b02090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007fae01de6038 R14: 00007fae01de5fa0 R15: 00007ffd45480c38
</TASK>
------------[ cut here ]------------
kernel BUG at arch/x86/mm/physaddr.c:28!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5336 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:__phys_addr+0x16b/0x180 arch/x86/mm/physaddr.c:28
Code: 8b b3 00 e9 45 ff ff ff e8 b2 af 4b 00 48 c7 c7 f0 33 fb 8d 48 89 de 4c 89 f2 e8 50 c0 52 03 e9 4d ff ff ff e8 96 af 4b 00 90 <0f> 0b e8 8e af 4b 00 90 0f 0b e8 86 af 4b 00 90 0f 0b 0f 1f 00 90
RSP: 0018:ffffc9000aae5f80 EFLAGS: 00010093
RAX: ffffffff817610fa RBX: 0000778000000000 RCX: ffff8880007ca4c0
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000778000000000
RBP: ffffc9000aae6130 R08: ffffffff8e26c433 R09: 1ffffffff1c4d886
R10: dffffc0000000000 R11: fffffbfff1c4d887 R12: 0000000000000011
R13: dffffc0000000000 R14: 0000000080000000 R15: dffffc0000000000
FS: 00007fae02b026c0(0000) GS:ffff88808d23e000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fae01d2dea0 CR3: 000000000b669000 CR4: 0000000000352ef0
Call Trace:
<TASK>
virt_to_folio include/linux/mm.h:1432 [inline]
virt_to_ioptdesc drivers/iommu/iommu-pages.h:49 [inline]
iommu_pages_start_incoherent+0x52/0x310 drivers/iommu/iommu-pages.c:148
_table_alloc drivers/iommu/generic_pt/iommu_pt.h:377 [inline]
table_alloc drivers/iommu/generic_pt/iommu_pt.h:408 [inline]
pt_iommu_new_table drivers/iommu/generic_pt/iommu_pt.h:424 [inline]
__map_range+0x270/0xa80 drivers/iommu/generic_pt/iommu_pt.h:584
pt_descend drivers/iommu/generic_pt/pt_iter.h:391 [inline]
__map_range+0x511/0xa80 drivers/iommu/generic_pt/iommu_pt.h:619
pt_descend drivers/iommu/generic_pt/pt_iter.h:391 [inline]
__map_range+0x511/0xa80 drivers/iommu/generic_pt/iommu_pt.h:619
pt_iommu_vtdss_map_pages+0x6a3/0x960 drivers/iommu/generic_pt/iommu_pt.h:905
iommu_map_nosync+0x30a/0x840 drivers/iommu/iommu.c:2549
iommu_map_sg+0x579/0xae0 drivers/iommu/iommu.c:2721
iommu_dma_map_sg+0x908/0x1000 drivers/iommu/dma-iommu.c:1493
__dma_map_sg_attrs+0xd0/0x520 kernel/dma/mapping.c:245
dma_map_sg_attrs+0x32/0x50 kernel/dma/mapping.c:284
ata_sg_setup drivers/ata/libata-core.c:4773 [inline]
ata_qc_issue+0x515/0xf30 drivers/ata/libata-core.c:5085
ata_scsi_translate drivers/ata/libata-scsi.c:1755 [inline]
__ata_scsi_queuecmd+0x957/0xf60 drivers/ata/libata-scsi.c:4355
ata_scsi_queuecmd+0x3d4/0x5c0 drivers/ata/libata-scsi.c:4400
scsi_dispatch_cmd drivers/scsi/scsi_lib.c:1638 [inline]
scsi_queue_rq+0x18bc/0x30d0 drivers/scsi/scsi_lib.c:1895
blk_mq_dispatch_rq_list+0x4c0/0x1900 block/blk-mq.c:2137
__blk_mq_do_dispatch_sched block/blk-mq-sched.c:168 [inline]
blk_mq_do_dispatch_sched block/blk-mq-sched.c:182 [inline]
__blk_mq_sched_dispatch_requests+0xdac/0x1570 block/blk-mq-sched.c:307
blk_mq_sched_dispatch_requests+0xd7/0x190 block/blk-mq-sched.c:329
blk_mq_run_hw_queue+0x404/0x4f0 block/blk-mq.c:2375
blk_mq_dispatch_list+0xd0b/0xe00 include/linux/spinlock.h:-1
blk_mq_flush_plug_list+0x469/0x550 block/blk-mq.c:2986
blk_add_rq_to_plug+0x175/0x450 block/blk-mq.c:1407
blk_mq_submit_bio+0xd5b/0x26b0 block/blk-mq.c:3232
__submit_bio+0x207/0x5a0 block/blk-core.c:637
__submit_bio_noacct_mq block/blk-core.c:724 [inline]
submit_bio_noacct_nocheck+0x377/0xa30 block/blk-core.c:755
__blkdev_direct_IO+0x915/0xf90 block/fops.c:264
blkdev_direct_IO+0x1261/0x17e0 block/fops.c:441
blkdev_direct_write+0x7c/0x140 block/fops.c:727
blkdev_write_iter+0x547/0x710 block/fops.c:795
do_iter_readv_writev+0x623/0x8c0 fs/read_write.c:-1
vfs_writev+0x31a/0x960 fs/read_write.c:1057
do_writev+0x14d/0x2d0 fs/read_write.c:1103
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fae01b8f7c9
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:00007fae02b02038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007fae01de5fa0 RCX: 00007fae01b8f7c9
RDX: 0000000000000021 RSI: 0000200000000a40 RDI: 0000000000000004
RBP: 00007fae02b02090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007fae01de6038 R14: 00007fae01de5fa0 R15: 00007ffd45480c38
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__phys_addr+0x16b/0x180 arch/x86/mm/physaddr.c:28
Code: 8b b3 00 e9 45 ff ff ff e8 b2 af 4b 00 48 c7 c7 f0 33 fb 8d 48 89 de 4c 89 f2 e8 50 c0 52 03 e9 4d ff ff ff e8 96 af 4b 00 90 <0f> 0b e8 8e af 4b 00 90 0f 0b e8 86 af 4b 00 90 0f 0b 0f 1f 00 90
RSP: 0018:ffffc9000aae5f80 EFLAGS: 00010093
RAX: ffffffff817610fa RBX: 0000778000000000 RCX: ffff8880007ca4c0
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000778000000000
RBP: ffffc9000aae6130 R08: ffffffff8e26c433 R09: 1ffffffff1c4d886
R10: dffffc0000000000 R11: fffffbfff1c4d887 R12: 0000000000000011
R13: dffffc0000000000 R14: 0000000080000000 R15: dffffc0000000000
FS: 00007fae02b026c0(0000) GS:ffff88808d23e000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fae01d2dea0 CR3: 000000000b669000 CR4: 0000000000352ef0
---
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
next reply other threads:[~2025-12-11 3:26 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-11 3:26 syzbot [this message]
2025-12-11 7:36 ` [syzbot] [iommu?] kernel BUG in iommu_pages_start_incoherent Will Deacon
2025-12-12 6:47 ` Jason Gunthorpe
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=693a39de.050a0220.4004e.02ce.GAE@google.com \
--to=syzbot+e06bb7478e687f235ad7@syzkaller.appspotmail.com \
--cc=iommu@lists.linux.dev \
--cc=joro@8bytes.org \
--cc=linux-kernel@vger.kernel.org \
--cc=robin.murphy@arm.com \
--cc=syzkaller-bugs@googlegroups.com \
--cc=will@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.