WARNING in __getblk_gfp

Status: upstream: reported on 2026/07/26 15:32
Reported-by: syzbot+9467e600602a876a459c@syzkaller.appspotmail.com
First crash: 11d, last: 1d13h
Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.6 WARNING in __getblk_gfp -1 1 1d13h 1d13h 0/2 upstream: reported on 2026/08/05 02:37

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 3600 at mm/page_alloc.c:4526 __alloc_pages_may_oom mm/page_alloc.c:4526 [inline]
WARNING: CPU: 1 PID: 3600 at mm/page_alloc.c:4526 __alloc_pages_slowpath+0x1b6e/0x2290 mm/page_alloc.c:5333
Modules linked in:
CPU: 1 PID: 3600 Comm: jbd2/sda1-8 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:__alloc_pages_may_oom mm/page_alloc.c:4526 [inline]
RIP: 0010:__alloc_pages_slowpath+0x1b6e/0x2290 mm/page_alloc.c:5333
Code: e9 ad ee ff ff 44 89 f1 80 e1 07 80 c1 03 38 c1 0f 8c ff ee ff ff 4c 89 f7 e8 3e 1d 0b 00 e9 f2 ee ff ff c6 05 3a 62 44 0c 01 <0f> 0b 66 83 7c 24 04 00 0f 89 bd fb ff ff 8b 7c 24 04 8b 1c 24 89
RSP: 0018:ffffc9000e69f2c0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ebc3cae356b24300
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffc9000e69f440
RBP: ffffc9000e69f510 R08: ffff88823fff8497 R09: 1ffff11047fff092
R10: dffffc0000000000 R11: ffffed1047fff093 R12: 0000000000000000
R13: 0000000000000011 R14: 0000000000000001 R15: ffffc9000e69f568
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1ba13eb700 CR3: 000000007cfcc000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __alloc_pages+0x346/0x4f0 mm/page_alloc.c:5671
 folio_alloc+0x1c/0x60 mm/mempolicy.c:2292
 filemap_alloc_folio+0xdb/0x480 mm/filemap.c:999
 __filemap_get_folio+0x6ba/0xde0 mm/filemap.c:1993
 pagecache_get_page+0x26/0x260 mm/folio-compat.c:110
 find_or_create_page include/linux/pagemap.h:648 [inline]
 grow_dev_page fs/buffer.c:946 [inline]
 grow_buffers fs/buffer.c:1011 [inline]
 __getblk_slow fs/buffer.c:1038 [inline]
 __getblk_gfp+0x2a0/0xa80 fs/buffer.c:1333
 __getblk include/linux/buffer_head.h:411 [inline]
 jbd2_journal_get_descriptor_buffer+0xcd/0x360 fs/jbd2/journal.c:1023
 jbd2_journal_commit_transaction+0x13fd/0x5f30 fs/jbd2/commit.c:645
 kjournald2+0x40b/0x800 fs/jbd2/journal.c:210
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>

Crashes (9):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/05 02:03 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __getblk_gfp
2026/08/05 01:38 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __getblk_gfp
2026/08/05 01:19 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __getblk_gfp
2026/08/04 23:34 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __getblk_gfp
2026/08/04 23:31 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __getblk_gfp
2026/08/04 23:00 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __getblk_gfp
2026/08/04 21:20 linux-6.1.y fb28aa725e05 d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __getblk_gfp
2026/07/26 20:15 linux-6.1.y dc5c83b7f5f8 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __getblk_gfp
2026/07/26 15:31 linux-6.1.y dc5c83b7f5f8 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan WARNING in __getblk_gfp
* Struck through repros no longer work on HEAD.