Re: [moderation/CI] Re: iomap: follow the alignment requirement for iomap_dio_hole_iter()
Pimyn Girgis <[email protected]> Fri, 31 Jul 2026 13:39:04 +0200
| Newsgroups | dev.linux.lists.syzbot |
|---|---|
| Message-ID | <CAJWNTGydQUh=8jg-UbLdc-BT-zF6MWb3N5qLGBeifcSpfcCKUg@mail.gmail.com> |
#syz upstream On Fri, Jul 31, 2026 at 1:38=E2=80=AFPM syzbot ci <[email protected]> wrote: > > syzbot ci has tested the following series > > [v1] iomap: follow the alignment requirement for iomap_dio_hole_iter() > https://lore.kernel.org/all/e69cc8a4a9c3f641b97872b50f04c397880077cd.1785= [email protected] > * [PATCH] iomap: follow the alignment requirement for iomap_dio_hole_iter= () > > and found the following issue: > general protection fault in __iomap_dio_rw > > Full report is available here: > https://ci.syzbot.org/series/81e0fbae-4715-4d62-8e9e-bcd19e46b164 > > *** > > general protection fault in __iomap_dio_rw > > tree: vfs > URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/vfs/v= fs.git > base: 70c2cbf8600c7d3a622b77e31136b83d6ac7d86c > arch: amd64 > compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~e= xp1~20260613092250.77), Debian LLD 22.1.8 > config: https://ci.syzbot.org/builds/8d5fee65-291c-46a2-9f9a-d512f8fad= 82b/config > syz repro: https://ci.syzbot.org/findings/c9f79a18-3316-44ec-b805-b805b1c= 49325/syz_repro > > loop0: rw=3D2049, sector=3D53248, nr_sectors =3D 976 limit=3D40427 > Oops: general protection fault, probably for non-canonical address 0xdfff= fc0000000003: 0000 [#1] SMP KASAN PTI > KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] > CPU: 0 UID: 0 PID: 5842 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(f= ull) > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.= 16.2-1 04/01/2014 > RIP: 0010:bdev_get_queue include/linux/blkdev.h:1058 [inline] > RIP: 0010:bdev_logical_block_size include/linux/blkdev.h:1403 [inline] > RIP: 0010:iomap_dio_alignment fs/iomap/direct-io.c:415 [inline] > RIP: 0010:iomap_dio_hole_iter fs/iomap/direct-io.c:595 [inline] > RIP: 0010:iomap_dio_iter fs/iomap/direct-io.c:643 [inline] > RIP: 0010:__iomap_dio_rw+0x1142/0x2130 fs/iomap/direct-io.c:815 > Code: e2 5a ff 83 e3 08 75 5c e8 ab de 5a ff 48 8b 9c 24 68 01 00 00 48 8= 3 c3 18 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74= 08 48 89 df e8 d0 75 c8 ff 48 8b 1b b8 58 01 00 00 > RSP: 0018:ffffc90003fef560 EFLAGS: 00010206 > RAX: 0000000000000003 RBX: 0000000000000018 RCX: dffffc0000000000 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 > RBP: ffffc90003fef860 R08: ffff8881148d8fff R09: 0000000000000000 > R10: ffff8881148d8000 R11: ffffed102291b200 R12: 1ffff920007fdecc > R13: 0000000000000000 R14: ffff888166b45340 R15: 0000000000001000 > FS: 00007fd77743d6c0(0000) GS:ffff88818d951000(0000) knlGS:0000000000000= 000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000200000078000 CR3: 000000011606a000 CR4: 00000000000006f0 > Call Trace: > <TASK> > f2fs_dio_read_iter fs/f2fs/file.c:4887 [inline] > f2fs_file_read_iter+0x60b/0x940 fs/f2fs/file.c:4950 > copy_splice_read+0x5ff/0xaa0 fs/splice.c:362 > do_splice_read fs/splice.c:979 [inline] > splice_direct_to_actor+0x4b6/0xcb0 fs/splice.c:1084 > do_splice_direct_actor fs/splice.c:1202 [inline] > do_splice_direct+0x195/0x290 fs/splice.c:1228 > do_sendfile+0x52e/0x7c0 fs/read_write.c:1371 > __do_sys_sendfile64 fs/read_write.c:1432 [inline] > __se_sys_sendfile64+0x144/0x1a0 fs/read_write.c:1418 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7fd77659df99 > Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f= 7 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:00007fd77743d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 > RAX: ffffffffffffffda RBX: 00007fd776825fa0 RCX: 00007fd77659df99 > RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000004 > RBP: 00007fd776634ec4 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000800000009 R11: 0000000000000246 R12: 0000000000000000 > R13: 00007fd776826038 R14: 00007fd776825fa0 R15: 00007fff168f4a18 > </TASK> > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:bdev_get_queue include/linux/blkdev.h:1058 [inline] > RIP: 0010:bdev_logical_block_size include/linux/blkdev.h:1403 [inline] > RIP: 0010:iomap_dio_alignment fs/iomap/direct-io.c:415 [inline] > RIP: 0010:iomap_dio_hole_iter fs/iomap/direct-io.c:595 [inline] > RIP: 0010:iomap_dio_iter fs/iomap/direct-io.c:643 [inline] > RIP: 0010:__iomap_dio_rw+0x1142/0x2130 fs/iomap/direct-io.c:815 > Code: e2 5a ff 83 e3 08 75 5c e8 ab de 5a ff 48 8b 9c 24 68 01 00 00 48 8= 3 c3 18 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74= 08 48 89 df e8 d0 75 c8 ff 48 8b 1b b8 58 01 00 00 > RSP: 0018:ffffc90003fef560 EFLAGS: 00010206 > RAX: 0000000000000003 RBX: 0000000000000018 RCX: dffffc0000000000 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 > RBP: ffffc90003fef860 R08: ffff8881148d8fff R09: 0000000000000000 > R10: ffff8881148d8000 R11: ffffed102291b200 R12: 1ffff920007fdecc > R13: 0000000000000000 R14: ffff888166b45340 R15: 0000000000001000 > FS: 00007fd77743d6c0(0000) GS:ffff8882a8f51000(0000) knlGS:0000000000000= 000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007faa8f64dc80 CR3: 000000011606a000 CR4: 00000000000006f0 > ---------------- > Code disassembly (best guess): > 0: e2 5a loop 0x5c > 2: ff 83 e3 08 75 5c incl 0x5c7508e3(%rbx) > 8: e8 ab de 5a ff call 0xff5adeb8 > d: 48 8b 9c 24 68 01 00 mov 0x168(%rsp),%rbx > 14: 00 > 15: 48 83 c3 18 add $0x18,%rbx > 19: 48 89 d8 mov %rbx,%rax > 1c: 48 c1 e8 03 shr $0x3,%rax > 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx > 27: fc ff df > * 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping in= struction > 2e: 74 08 je 0x38 > 30: 48 89 df mov %rbx,%rdi > 33: e8 d0 75 c8 ff call 0xffc87608 > 38: 48 8b 1b mov (%rbx),%rbx > 3b: b8 58 01 00 00 mov $0x158,%eax > > > *** > > If these findings have caused you to resend the series or submit a > separate fix, please add the following tag to your commit message: > Tested-by: [email protected] > > --- > This report is generated by a bot. It may contain errors. > syzbot ci engineers can be reached at [email protected]. > > To test a patch for this bug, please reply with `#syz test` > (should be on a separate line). > > The patch should be attached to the email. > Note: arguments like custom git repos and branches are not supported. > > The email will later be sent to: > [[email protected] [email protected] linux-xfs@vger= .kernel.org [email protected]] > > If the report looks fine to you, reply with: > #syz upstream > > If the report is a false positive, reply with > #syz invalid > > -- > You received this message because you are subscribed to the Google Groups= "syzkaller-upstream-moderation" group. > To unsubscribe from this group and stop receiving emails from it, send an= email to [email protected]. > To view this discussion visit https://groups.google.com/d/msgid/syzkaller= -upstream-moderation/6a6c8925.1b55b669.19788.001c.GAE%40google.com. --=20 =E2=B2=A0=E2=B2=9F=E2=B2=93=E2=B2=99=E2=B2=8F=E2=B2=9B =E2=B2=84=E2=B2=89= =E2=B2=B1=E2=B2=A3=E2=B2=85=E2=B2=93=E2=B2=9F=E2=B2=A5 - Pimyn Girgis Software Engineer Kernel Dynamic Analysis [email protected]