[moderation/CI] Re: iomap: follow the alignment requirement for iomap_dio_hole_iter()

[syzbot ci]

syzbot ci has tested the following series

[v1] iomap: follow the alignment requirement for iomap_dio_hole_iter()
https://lore.kernel.org/all/e69cc8a4a9c3f641b97872b50f04c...@suse.com
* [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/vfs.git
base: 70c2cbf8600c7d3a622b77e31136b83d6ac7d86c
arch: amd64
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
config: https://ci.syzbot.org/builds/8d5fee65-291c-46a2-9f9a-d512f8fad82b/config
syz repro: https://ci.syzbot.org/findings/c9f79a18-3316-44ec-b805-b805b1c49325/syz_repro

loop0: rw=2049, sector=53248, nr_sectors = 976 limit=40427
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 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(full)
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 83 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:0000000000000000
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 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: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 83 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:0000000000000000
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 instruction
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: syz...@syzkaller.appspotmail.com

---
This report is generated by a bot. It may contain errors.
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To test a patch for this bug, please reply with `#syz test`
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The patch should be attached to the email.
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If the report looks fine to you, reply with:
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[Pimyn Girgis]

#syz upstream

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--
Ⲡⲟⲓⲙⲏⲛ Ⲅⲉⲱⲣⲅⲓⲟⲥ - Pimyn Girgis
Software Engineer
Kernel Dynamic Analysis
pi...@google.com

[syzbot ci]

syzbot ci has tested the following series

[v2] iomap: follow the alignment requirement for iomap_dio_hole_iter()
https://lore.kernel.org/all/9209e7204fc6b7b60c28f19675008...@suse.com
* [PATCH v2] iomap: follow the alignment requirement for iomap_dio_hole_iter()

and found the following issue:

general protection fault in iomap_dio_hole_iter

Full report is available here:

https://ci.syzbot.org/series/9d98023b-4249-4697-ab21-ea7cf83805c8

***

general protection fault in iomap_dio_hole_iter

tree: vfs
URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/vfs/vfs.git

base: fa20f6cb6063f7f1a6a56693d4a8713f19058d23

arch: amd64
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8

config: https://ci.syzbot.org/builds/a53b891c-9ac3-484a-a77e-61c04d35157f/config
syz repro: https://ci.syzbot.org/findings/8ed3b1e3-7e4e-4c2c-b0f6-934cfea6e536/syz_repro

syz.0.17: attempt to access beyond end of device

loop0: rw=2049, sector=53248, nr_sectors = 976 limit=40427
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]

CPU: 1 UID: 0 PID: 6257 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)

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:1056 [inline]
RIP: 0010:bdev_logical_block_size include/linux/blkdev.h:1401 [inline]
RIP: 0010:iomap_dio_alignment fs/iomap/direct-io.c:412 [inline]
RIP: 0010:iomap_dio_hole_iter+0x1bf/0x390 fs/iomap/direct-io.c:598
Code: fc ff df 80 3c 08 00 74 08 4c 89 ef e8 aa d7 c7 ff 49 8b 6d 00 48 83 c5 18 48 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 ef e8 83 d7 c7 ff 41 bd 58 01 00 00 4c 03
RSP: 0018:ffffc90003eff500 EFLAGS: 00010206
RAX: 0000000000000003 RBX: ffffc90003eff680 RCX: dffffc0000000000

RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000

RBP: 0000000000000018 R08: ffff88816dc38fff R09: 0000000000000000
R10: ffff88816dc38000 R11: ffffed102db87200 R12: 0000000000001000
R13: ffffc90003eff6c8 R14: ffff88816b839c00 R15: 1ffff1102d707388
FS: 00007ffb1678d6c0(0000) GS:ffff8882a8f4b000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 0000563ae8dcd0a8 CR3: 0000000110cf4000 CR4: 00000000000006f0
Call Trace:
<TASK>
iomap_dio_iter fs/iomap/direct-io.c:-1 [inline]
__iomap_dio_rw+0xe56/0x1ac0 fs/iomap/direct-io.c:823

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: 0033:0x7ffb1599e019

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:00007ffb1678d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007ffb15c25fa0 RCX: 00007ffb1599e019

RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000004

RBP: 00007ffb15a3500c R08: 0000000000000000 R09: 0000000000000000

R10: 0000000800000009 R11: 0000000000000246 R12: 0000000000000000

R13: 00007ffb15c26038 R14: 00007ffb15c25fa0 R15: 00007ffc15b4ab58

</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---

RIP: 0010:bdev_get_queue include/linux/blkdev.h:1056 [inline]
RIP: 0010:bdev_logical_block_size include/linux/blkdev.h:1401 [inline]
RIP: 0010:iomap_dio_alignment fs/iomap/direct-io.c:412 [inline]
RIP: 0010:iomap_dio_hole_iter+0x1bf/0x390 fs/iomap/direct-io.c:598
Code: fc ff df 80 3c 08 00 74 08 4c 89 ef e8 aa d7 c7 ff 49 8b 6d 00 48 83 c5 18 48 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 ef e8 83 d7 c7 ff 41 bd 58 01 00 00 4c 03
RSP: 0018:ffffc90003eff500 EFLAGS: 00010206
RAX: 0000000000000003 RBX: ffffc90003eff680 RCX: dffffc0000000000

RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000

RBP: 0000000000000018 R08: ffff88816dc38fff R09: 0000000000000000
R10: ffff88816dc38000 R11: ffffed102db87200 R12: 0000000000001000
R13: ffffc90003eff6c8 R14: ffff88816b839c00 R15: 1ffff1102d707388
FS: 00007ffb1678d6c0(0000) GS:ffff8882a8f4b000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 0000558d8b221b40 CR3: 0000000110cf4000 CR4: 00000000000006f0
----------------
Code disassembly (best guess), 2 bytes skipped:
0: df 80 3c 08 00 74 filds 0x7400083c(%rax)
6: 08 4c 89 ef or %cl,-0x11(%rcx,%rcx,4)
a: e8 aa d7 c7 ff call 0xffc7d7b9
f: 49 8b 6d 00 mov 0x0(%r13),%rbp
13: 48 83 c5 18 add $0x18,%rbp
17: 48 89 e8 mov %rbp,%rax
1a: 48 c1 e8 03 shr $0x3,%rax
1e: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx
25: fc ff df
* 28: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction
2c: 74 08 je 0x36
2e: 48 89 ef mov %rbp,%rdi
31: e8 83 d7 c7 ff call 0xffc7d7b9
36: 41 bd 58 01 00 00 mov $0x158,%r13d
3c: 4c rex.WR
3d: 03 .byte 0x3

[Aleksandr Nogikh]

#syz upstream

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