[syzbot] [pm?] kernel BUG in mark_free_pages

[syzbot] [pm?] kernel BUG in mark_free_pages

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    6addb4f38557 Merge tag 'edac_urgent_for_v7.3_rc6' of git:/..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=16d3d7f5580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=23e5acac5c98285f
dashboard link: https://syzkaller.appspot.com/bug?extid=609c80047e3e808b465c
compiler:       Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=121d2835580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=161d2835580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/484fafd2304b/disk-6addb4f3.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/3a897e82997f/vmlinux-6addb4f3.xz
kernel image: https://storage.googleapis.com/syzbot-assets/57fc9f6de4c3/bzImage-6addb4f3.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+609c80047e3e808b465c@syzkaller.appspotmail.com

Freezing user space processes
Freezing user space processes completed (elapsed 0.009 seconds)
OOM killer disabled.
PM: hibernation: Preallocating image memory
page:ffffea0005400000 is uninitialized and poisoned
page dumped because: VM_BUG_ON_PAGE(PagePoisoned(page))
There is not page extension available.
------------[ cut here ]------------
kernel BUG at ./include/linux/mm.h:2402!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5632 Comm: syz-executor292 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2026
RIP: 0010:page_to_nid include/linux/mm.h:2402 [inline]
RIP: 0010:page_zone include/linux/mm.h:2622 [inline]
RIP: 0010:mark_free_pages+0x49a/0x4b0 kernel/power/snapshot.c:1266
Code: 5d e9 3a b9 44 0a e8 15 c9 22 00 90 0f 0b e8 0d fe 41 0a e8 08 c9 22 00 48 8b 7c 24 08 48 c7 c6 64 6c 48 8e e8 97 db 82 ff 90 <0f> 0b e8 ef c8 22 00 90 0f 0b e8 e7 c8 22 00 90 0f 0b 0f 1f 40 00
RSP: 0018:ffffc900035a7ad8 EFLAGS: 00010046
RAX: 26156de6b9890800 RBX: 0000000000010000 RCX: 26156de6b9890800
RDX: 0000000000000000 RSI: 8000000000000001 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff8f6917a3 R09: 1ffffffff1ed22f4
R10: dffffc0000000000 R11: fffffbfff1ed22f5 R12: ffff88823fff8100
R13: 0000000000150000 R14: ffffffffffffffff R15: 0300000000000000
FS:  00007f23975186c0(0000) GS:ffff888124cc6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe53995418 CR3: 0000000021bc3000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 count_data_pages kernel/power/snapshot.c:1417 [inline]
 hibernate_preallocate_memory+0x14f/0x750 kernel/power/snapshot.c:1859
 hibernation_snapshot+0xd5/0x3d0 kernel/power/hibernate.c:416
 hibernate+0x28f/0x680 kernel/power/hibernate.c:813
 state_store+0x234/0x290 kernel/power/main.c:821
 kernfs_fop_write_iter+0x3a4/0x540 fs/kernfs/file.c:345
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x612/0xba0 fs/read_write.c:687
 ksys_write+0x150/0x270 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f23975400a9
Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 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 d0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f23975181d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f23975f0b48 RCX: 00007f23975400a9
RDX: 0000000000000005 RSI: 0000200000000100 RDI: 0000000000000003
RBP: 00007f23975f0b40 R08: 35203a6b63617473 R09: 35203a6b63617473
R10: 35203a6b63617473 R11: 0000000000000246 R12: 00007f23975c2378
R13: 0000200000000500 R14: 0000200000000600 R15: 00656e696c66666f
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:page_to_nid include/linux/mm.h:2402 [inline]
RIP: 0010:page_zone include/linux/mm.h:2622 [inline]
RIP: 0010:mark_free_pages+0x49a/0x4b0 kernel/power/snapshot.c:1266
Code: 5d e9 3a b9 44 0a e8 15 c9 22 00 90 0f 0b e8 0d fe 41 0a e8 08 c9 22 00 48 8b 7c 24 08 48 c7 c6 64 6c 48 8e e8 97 db 82 ff 90 <0f> 0b e8 ef c8 22 00 90 0f 0b e8 e7 c8 22 00 90 0f 0b 0f 1f 40 00
RSP: 0018:ffffc900035a7ad8 EFLAGS: 00010046
RAX: 26156de6b9890800 RBX: 0000000000010000 RCX: 26156de6b9890800
RDX: 0000000000000000 RSI: 8000000000000001 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff8f6917a3 R09: 1ffffffff1ed22f4
R10: dffffc0000000000 R11: fffffbfff1ed22f5 R12: ffff88823fff8100
R13: 0000000000150000 R14: ffffffffffffffff R15: 0300000000000000
FS:  00007f23975186c0(0000) GS:ffff888124cc6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe53995418 CR3: 0000000021bc3000 CR4: 0000000000350ef0


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

Forwarded: [PATCH v1] Poisend page in hibernation

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com.

***

Subject: [PATCH v1] Poisend page in hibernation
Author: nsvatoslav515@gmail.com

#syz test

Signed-off-by: Svyatoslav Nikolenko <nsvatoslav515@gmail.com>
---
 kernel/power/snapshot.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index b209712cb2c3..a893d48e770d 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -1256,7 +1256,10 @@ static void mark_free_pages(struct zone *zone)
 
 	max_zone_pfn = zone_end_pfn(zone);
 	for_each_valid_pfn(pfn, zone->zone_start_pfn, max_zone_pfn) {
-		page = pfn_to_page(pfn);
+		page = pfn_to_online_page(pfn);
+
+		if (!page)
+			continue;
 
 		if (!--page_count) {
 			touch_nmi_watchdog();
-- 
2.47.3

Forwarded: [PATCH v1] Poisoned page in hibernation

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com.

***

Subject: [PATCH v1] Poisoned page in hibernation
Author: nsvatoslav515@gmail.com

#syz test

Signed-off-by: Svyatoslav Nikolenko <nsvatoslav515@gmail.com>
---
 kernel/power/snapshot.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index b209712cb2c3..a893d48e770d 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -1256,7 +1256,10 @@ static void mark_free_pages(struct zone *zone)
 
 	max_zone_pfn = zone_end_pfn(zone);
 	for_each_valid_pfn(pfn, zone->zone_start_pfn, max_zone_pfn) {
-		page = pfn_to_page(pfn);
+		page = pfn_to_online_page(pfn);
+
+		if (!page)
+			continue;
 
 		if (!--page_count) {
 			touch_nmi_watchdog();
-- 
2.47.3

Re: [syzbot] [pm?] kernel BUG in mark_free_pages

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

failed to copy binary to VM: failed to run ["ssh" "-p" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "IdentitiesOnly=yes" "-o" "BatchMode=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "root@10.128.1.101" "mkdir" "-p" "ci-upstream-kasan-gce-root-test-job-parallel"]: exit status 255



syzkaller build log:
go env (err=<nil>)
AR='ar'
CC='gcc'
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_ENABLED='1'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
CXX='g++'
GCCGO='gccgo'
GO111MODULE='auto'
GOAMD64='v1'
GOARCH='amd64'
GOAUTH='netrc'
GOBIN=''
GOCACHE='/syzkaller/.cache/go-build'
GOCACHEPROG=''
GODEBUG=''
GOENV='/syzkaller/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFIPS140='off'
GOFLAGS=''
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build1553598807=/tmp/go-build -gno-record-gcc-switches'
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMOD='/syzkaller/jobs-2/linux/gopath/src/github.com/google/syzkaller/go.mod'
GOMODCACHE='/syzkaller/jobs-2/linux/gopath/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/syzkaller/jobs-2/linux/gopath'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTELEMETRY='local'
GOTELEMETRYDIR='/syzkaller/.config/go/telemetry'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.26.0'
GOWORK=''
PKG_CONFIG='pkg-config'

git status (err=<nil>)
HEAD detached at 57bbd979bc5
nothing to commit, working tree clean


tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
go list -f '{{.Stale}}' -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=57bbd979bc50a3acd0eac610ef944726ba358063 -X github.com/google/syzkaller/prog.gitRevisionDate=20261002-100947"  ./sys/syz-sysgen | grep -q false || go install -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=57bbd979bc50a3acd0eac610ef944726ba358063 -X github.com/google/syzkaller/prog.gitRevisionDate=20261002-100947"  ./sys/syz-sysgen
make .descriptions
tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
bin/syz-sysgen
touch .descriptions
GOOS=linux GOARCH=amd64 go build -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=57bbd979bc50a3acd0eac610ef944726ba358063 -X github.com/google/syzkaller/prog.gitRevisionDate=20261002-100947"  -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
mkdir -p ./bin/linux_amd64
g++ -o ./bin/linux_amd64/syz-executor executor/executor.cc \
	-m64 -O2 -pthread -Wall -Werror -Wparentheses -Wunused-const-variable -Wframe-larger-than=16384 -Wno-stringop-overflow -Wno-array-bounds -Wno-format-overflow -Wno-unused-but-set-variable -Wno-unused-command-line-argument -static-pie -std=c++17 -I. -Iexecutor/_include   -DGOOS_linux=1 -DGOARCH_amd64=1 \
	-DHOSTGOOS_linux=1 -DGIT_REVISION=\"57bbd979bc50a3acd0eac610ef944726ba358063\"
/usr/bin/ld: /tmp/ccVovhno.o: in function `Connection::Connect(char const*, char const*)':
executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEPKcS1_]+0x386): warning: Using 'gethostbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
./tools/check-syzos.sh 2>/dev/null



Tested on:

commit:         69f80fef Merge tag 'ata-7.3-rc7' of git://git.kernel.o..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=23e5acac5c98285f
dashboard link: https://syzkaller.appspot.com/bug?extid=609c80047e3e808b465c
compiler:       Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=1389d835580000

Re: [syzbot] [pm?] kernel BUG in mark_free_pages

[syzbot]

Hello,

syzbot tried to test the proposed patch but the build/boot failed:

failed to copy binary to VM: failed to run ["ssh" "-p" "22" "-F" "/dev/null" "-o" "UserKnownHostsFile=/dev/null" "-o" "IdentitiesOnly=yes" "-o" "BatchMode=yes" "-o" "StrictHostKeyChecking=no" "-o" "ConnectTimeout=10" "root@10.128.10.9" "mkdir" "-p" "ci-upstream-kasan-gce-root-test-job-parallel"]: exit status 255



syzkaller build log:
go env (err=<nil>)
AR='ar'
CC='gcc'
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_ENABLED='1'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
CXX='g++'
GCCGO='gccgo'
GO111MODULE='auto'
GOAMD64='v1'
GOARCH='amd64'
GOAUTH='netrc'
GOBIN=''
GOCACHE='/syzkaller/.cache/go-build'
GOCACHEPROG=''
GODEBUG=''
GOENV='/syzkaller/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFIPS140='off'
GOFLAGS=''
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build2341481522=/tmp/go-build -gno-record-gcc-switches'
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMOD='/syzkaller/jobs-2/linux/gopath/src/github.com/google/syzkaller/go.mod'
GOMODCACHE='/syzkaller/jobs-2/linux/gopath/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='linux'
GOPATH='/syzkaller/jobs-2/linux/gopath'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTELEMETRY='local'
GOTELEMETRYDIR='/syzkaller/.config/go/telemetry'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.26.0'
GOWORK=''
PKG_CONFIG='pkg-config'

git status (err=<nil>)
HEAD detached at 57bbd979bc5
nothing to commit, working tree clean


tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
go list -f '{{.Stale}}' -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=57bbd979bc50a3acd0eac610ef944726ba358063 -X github.com/google/syzkaller/prog.gitRevisionDate=20261002-100947"  ./sys/syz-sysgen | grep -q false || go install -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=57bbd979bc50a3acd0eac610ef944726ba358063 -X github.com/google/syzkaller/prog.gitRevisionDate=20261002-100947"  ./sys/syz-sysgen
make .descriptions
tput: No value for $TERM and no -T specified
tput: No value for $TERM and no -T specified
Makefile:31: run command via tools/syz-env for best compatibility, see:
Makefile:32: https://github.com/google/syzkaller/blob/master/docs/contributing.md#using-syz-env
bin/syz-sysgen
touch .descriptions
GOOS=linux GOARCH=amd64 go build -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=57bbd979bc50a3acd0eac610ef944726ba358063 -X github.com/google/syzkaller/prog.gitRevisionDate=20261002-100947"  -o ./bin/linux_amd64/syz-execprog github.com/google/syzkaller/tools/syz-execprog
mkdir -p ./bin/linux_amd64
g++ -o ./bin/linux_amd64/syz-executor executor/executor.cc \
	-m64 -O2 -pthread -Wall -Werror -Wparentheses -Wunused-const-variable -Wframe-larger-than=16384 -Wno-stringop-overflow -Wno-array-bounds -Wno-format-overflow -Wno-unused-but-set-variable -Wno-unused-command-line-argument -static-pie -std=c++17 -I. -Iexecutor/_include   -DGOOS_linux=1 -DGOARCH_amd64=1 \
	-DHOSTGOOS_linux=1 -DGIT_REVISION=\"57bbd979bc50a3acd0eac610ef944726ba358063\"
/usr/bin/ld: /tmp/ccowJ8dD.o: in function `Connection::Connect(char const*, char const*)':
executor.cc:(.text._ZN10Connection7ConnectEPKcS1_[_ZN10Connection7ConnectEPKcS1_]+0x386): warning: Using 'gethostbyname' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
./tools/check-syzos.sh 2>/dev/null



Tested on:

commit:         67f0943b Merge tag 'selinux-pr-20261005' of git://git...
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=23e5acac5c98285f
dashboard link: https://syzkaller.appspot.com/bug?extid=609c80047e3e808b465c
compiler:       Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
patch:          https://syzkaller.appspot.com/x/patch.diff?x=17b1cf25580000