linux-next boot error: WARNING in prepare_kswapd_sleep

Status: upstream: reported on 2020/11/24 07:54
Subsystems: mm
[Documentation on labels]
Reported-by: syzbot+ce635500093181f39c1c@syzkaller.appspotmail.com
Fix commit: mm/memcg: warn on missing memcg on mem_cgroup_page_lruvec()
Patched on: [ci-upstream-linux-next-kasan-gce-root], missing on: [ci-qemu-gce-upstream-auto ci-qemu-native-arm64-kvm ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 ci-snapshot-upstream-root ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64 ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci-upstream-rust-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-usb]
First crash: 2069d, last: 2067d
▶ ▼ ✨ AI Jobs (6)
ID Workflow Result Correct Bug Created Started Finished Revision Error
c4da65aa assessment-security 💥 linux-next boot error: WARNING in prepare_kswapd_sleep 2026/07/09 01:50 2026/07/09 01:50 2026/07/09 01:50 93f57954 
failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/8c55ee50694acd092b...
truncated to first 200 bytes; open job for full error
b4091d7b assessment-security 💥 linux-next boot error: WARNING in prepare_kswapd_sleep 2026/06/22 03:55 2026/06/22 03:55 2026/06/22 03:57 43bfcdb0 
failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/8c55ee50694acd092b...
truncated to first 200 bytes; open job for full error
de5b25b5 assessment-security 💥 linux-next boot error: WARNING in prepare_kswapd_sleep 2026/06/14 03:04 2026/06/14 03:04 2026/06/14 03:06 4f06757f 
failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/8c55ee50694acd092b...
truncated to first 200 bytes; open job for full error
b6010ba1 assessment-security 💥 linux-next boot error: WARNING in prepare_kswapd_sleep 2026/06/09 18:51 2026/06/09 18:51 2026/06/09 18:53 c36c07f6 
failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/8c55ee50694acd092b...
truncated to first 200 bytes; open job for full error
67221637 assessment-security 💥 linux-next boot error: WARNING in prepare_kswapd_sleep 2026/06/02 17:39 2026/06/02 17:39 2026/06/02 17:42 62fe1528 
failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/8c55ee50694acd092b...
truncated to first 200 bytes; open job for full error
684d5885 assessment-security 💥 linux-next boot error: WARNING in prepare_kswapd_sleep 2026/05/26 06:28 2026/05/26 06:28 2026/05/26 06:30 c69befb3 
failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/8c55ee50694acd092b...
truncated to first 200 bytes; open job for full error
▶ ▼ Discussions (2)
Title Replies (including bot) Last reply
[PATCH] mm/memcg: warn on missing memcg on mem_cgroup_page_lruvec() 3 (3) 2020/11/25 22:27
linux-next boot error: WARNING in prepare_kswapd_sleep 3 (4) 2020/11/25 11:25

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 2193 at include/linux/memcontrol.h:621 arch_static_branch arch/x86/include/asm/jump_label.h:25 [inline]
WARNING: CPU: 0 PID: 2193 at include/linux/memcontrol.h:621 mem_cgroup_disabled include/linux/memcontrol.h:504 [inline]
WARNING: CPU: 0 PID: 2193 at include/linux/memcontrol.h:621 mem_cgroup_lruvec include/linux/memcontrol.h:616 [inline]
WARNING: CPU: 0 PID: 2193 at include/linux/memcontrol.h:621 clear_pgdat_congested mm/vmscan.c:3443 [inline]
WARNING: CPU: 0 PID: 2193 at include/linux/memcontrol.h:621 prepare_kswapd_sleep mm/vmscan.c:3480 [inline]
WARNING: CPU: 0 PID: 2193 at include/linux/memcontrol.h:621 prepare_kswapd_sleep+0xed/0x250 mm/vmscan.c:3456
Modules linked in:
CPU: 0 PID: 2193 Comm: kswapd0 Not tainted 5.10.0-rc5-next-20201125-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:mem_cgroup_lruvec include/linux/memcontrol.h:621 [inline]
RIP: 0010:clear_pgdat_congested mm/vmscan.c:3443 [inline]
RIP: 0010:prepare_kswapd_sleep mm/vmscan.c:3480 [inline]
RIP: 0010:prepare_kswapd_sleep+0xed/0x250 mm/vmscan.c:3456
Code: 89 ee 48 89 df e8 73 d3 ff ff 31 ff 41 89 c4 89 c6 e8 87 19 d7 ff 45 84 e4 74 cc e8 6d 21 d7 ff 0f 1f 44 00 00 e8 63 21 d7 ff <0f> 0b 48 c7 c0 a8 e0 ee 8c 48 ba 00 00 00 00 00 fc ff df 48 c1 e8
RSP: 0000:ffffc9000826fda0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88813fffb000 RCX: ffffffff81998ed9
RDX: ffff888017325040 RSI: ffffffff81998eed RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000ab3 R09: 0000000000000f89
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000004 R14: 0000000000000000 R15: 0000000000000003
FS:  0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000000b08e000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 kswapd_try_to_sleep mm/vmscan.c:3784 [inline]
 kswapd+0x37d/0xdb0 mm/vmscan.c:3899
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 2193 Comm: kswapd0 Not tainted 5.10.0-rc5-next-20201125-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:120
 panic+0x306/0x73d kernel/panic.c:231
 __warn.cold+0x35/0x44 kernel/panic.c:605
 report_bug+0x1bd/0x210 lib/bug.c:198
 handle_bug+0x3c/0x60 arch/x86/kernel/traps.c:239
 exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:259
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:578
RIP: 0010:mem_cgroup_lruvec include/linux/memcontrol.h:621 [inline]
RIP: 0010:clear_pgdat_congested mm/vmscan.c:3443 [inline]
RIP: 0010:prepare_kswapd_sleep mm/vmscan.c:3480 [inline]
RIP: 0010:prepare_kswapd_sleep+0xed/0x250 mm/vmscan.c:3456
Code: 89 ee 48 89 df e8 73 d3 ff ff 31 ff 41 89 c4 89 c6 e8 87 19 d7 ff 45 84 e4 74 cc e8 6d 21 d7 ff 0f 1f 44 00 00 e8 63 21 d7 ff <0f> 0b 48 c7 c0 a8 e0 ee 8c 48 ba 00 00 00 00 00 fc ff df 48 c1 e8
RSP: 0000:ffffc9000826fda0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88813fffb000 RCX: ffffffff81998ed9
RDX: ffff888017325040 RSI: ffffffff81998eed RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000ab3 R09: 0000000000000f89
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000004 R14: 0000000000000000 R15: 0000000000000003
 kswapd_try_to_sleep mm/vmscan.c:3784 [inline]
 kswapd+0x37d/0xdb0 mm/vmscan.c:3899
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (15):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/11/25 21:59 linux-next 9d3e48f20e11 2f1cec62 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/11/25 21:59 linux-next 9d3e48f20e11 2f1cec62 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/11/25 21:59 linux-next 9d3e48f20e11 2f1cec62 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/11/25 11:46 linux-next 9d3e48f20e11 1a1f4bd8 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/11/25 11:46 linux-next 9d3e48f20e11 1a1f4bd8 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/11/25 11:46 linux-next 9d3e48f20e11 1a1f4bd8 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/11/25 05:56 linux-next d9137320ac06 1a1f4bd8 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/11/25 05:56 linux-next d9137320ac06 1a1f4bd8 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/11/25 05:56 linux-next d9137320ac06 1a1f4bd8 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/11/24 17:53 linux-next d9137320ac06 e34b696c .config console log report ci-upstream-linux-next-kasan-gce-root
2020/11/24 17:53 linux-next d9137320ac06 e34b696c .config console log report ci-upstream-linux-next-kasan-gce-root
2020/11/24 17:53 linux-next d9137320ac06 e34b696c .config console log report ci-upstream-linux-next-kasan-gce-root
2020/11/24 07:40 linux-next d9137320ac06 1ab681a4 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/11/24 07:40 linux-next d9137320ac06 1ab681a4 .config console log report ci-upstream-linux-next-kasan-gce-root
2020/11/24 07:40 linux-next d9137320ac06 1ab681a4 .config console log report ci-upstream-linux-next-kasan-gce-root
* Struck through repros no longer work on HEAD.