syzbot


kernel BUG in PageHuge

Status: fixed on 2024/05/22 23:08
Subsystems: mm
[Documentation on labels]
Reported-by: syzbot+adb570fc6161d33edb01@syzkaller.appspotmail.com
Fix commit: d99e3140a4d3 mm: turn folio_test_hugetlb into a PageType
First crash: 68d, last: 68d
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [mm?] kernel BUG in PageHuge 1 (2) 2024/03/25 10:16

Sample crash report:
------------[ cut here ]------------
kernel BUG at include/linux/page-flags.h:314!
Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 12282 Comm: syz-executor.2 Not tainted 6.8.0-rc7-syzkaller-g707081b61156 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : folio_flags include/linux/page-flags.h:314 [inline]
pc : folio_test_hugetlb include/linux/page-flags.h:849 [inline]
pc : PageHuge+0x1f8/0x1fc mm/hugetlb.c:2173
lr : folio_flags include/linux/page-flags.h:314 [inline]
lr : folio_test_hugetlb include/linux/page-flags.h:849 [inline]
lr : PageHuge+0x1f8/0x1fc mm/hugetlb.c:2173
sp : ffff800097ca6d00
x29: ffff800097ca6d00 x28: dfff800000000000 x27: fffffdffc318ac00
x26: 00000000000000b0 x25: fffffdffc3188000 x24: 05ffc00000000840
x23: 1fffffbff8631580 x22: 1fffffbff8631581 x21: dfff800000000000
x20: 05ffc00000000000 x19: fffffdffc318ac00 x18: 1fffe000367fff96
x17: ffff80008ec9d000 x16: ffff80008ad6b09c x15: 0000000000000001
x14: 1ffff00012f94ce4 x13: 0000000000000000 x12: 0000000000000000
x11: 0000000000040000 x10: 000000000003ffff x9 : ffff80009a5da000
x8 : 0000000000040000 x7 : ffff800080297c0c x6 : 0000000000000000
x5 : 0000000000000001 x4 : 0000000000000001 x3 : ffff800082f248d0
x2 : 0000000000000001 x1 : 0000000100000000 x0 : 0000000000000166
Call trace:
 folio_flags include/linux/page-flags.h:314 [inline]
 folio_test_hugetlb include/linux/page-flags.h:849 [inline]
 PageHuge+0x1f8/0x1fc mm/hugetlb.c:2173
 isolate_migratepages_block+0x7d8/0x2f9c mm/compaction.c:950
 isolate_migratepages mm/compaction.c:2074 [inline]
 compact_zone+0x26a8/0x4120 mm/compaction.c:2530
 compact_node+0x234/0x3c0 mm/compaction.c:2851
 compact_nodes mm/compaction.c:2864 [inline]
 sysctl_compaction_handler+0x110/0x1d4 mm/compaction.c:2910
 proc_sys_call_handler+0x4cc/0x7cc fs/proc/proc_sysctl.c:595
 proc_sys_write+0x2c/0x3c fs/proc/proc_sysctl.c:621
 call_write_iter include/linux/fs.h:2087 [inline]
 iter_file_splice_write+0x894/0xfc0 fs/splice.c:743
 do_splice_from fs/splice.c:941 [inline]
 direct_splice_actor+0xec/0x1d8 fs/splice.c:1164
 splice_direct_to_actor+0x438/0xa0c fs/splice.c:1108
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0x1e4/0x304 fs/splice.c:1233
 do_sendfile+0x460/0xb3c fs/read_write.c:1295
 __do_sys_sendfile64 fs/read_write.c:1356 [inline]
 __se_sys_sendfile64 fs/read_write.c:1348 [inline]
 __arm64_sys_sendfile64+0x23c/0x3b4 fs/read_write.c:1348
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598
Code: f0052f01 912c0021 aa1303e0 97fbce80 (d4210000) 
---[ end trace 0000000000000000 ]---

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/03/21 05:34 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 707081b61156 5b7d42ae .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 kernel BUG in PageHuge
* Struck through repros no longer work on HEAD.