general protection fault in __bh_submit

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 0 UID: 0 PID: 4949 Comm: jbd2/sda1-8 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:const_folio_flags include/linux/page-flags.h:345 [inline]
RIP: 0010:folio_test_dropbehind include/linux/page-flags.h:601 [inline]
RIP: 0010:__bh_submit+0x22d/0x8d0 fs/buffer.c:1109
Code: c1 e8 03 48 89 44 24 18 42 80 3c 20 00 74 08 48 89 df e8 56 d6 d7 ff 48 89 5c 24 28 48 8b 1b 4c 8d 7b 08 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 34 d6 d7 ff 4d 8b 3f 4c 89 fe 48
RSP: 0018:ffffc9000e54f868 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff84b970d9
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff88802b59bde0
RBP: 0000000000009801 R08: ffff88802b59be3f R09: 1ffff110056b37c7
R10: dffffc0000000000 R11: ffffed10056b37c8 R12: dffffc0000000000
R13: ffff88802b59bdc0 R14: ffff8880767c18c0 R15: 0000000000000008
FS:  0000000000000000(0000) GS:ffff888124ccd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3a45802008 CR3: 0000000073b10000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 jbd2_journal_commit_transaction+0x22a9/0x5cd0 fs/jbd2/commit.c:751
 kjournald2+0x3bc/0x750 fs/jbd2/journal.c:200
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:const_folio_flags include/linux/page-flags.h:345 [inline]
RIP: 0010:folio_test_dropbehind include/linux/page-flags.h:601 [inline]
RIP: 0010:__bh_submit+0x22d/0x8d0 fs/buffer.c:1109
Code: c1 e8 03 48 89 44 24 18 42 80 3c 20 00 74 08 48 89 df e8 56 d6 d7 ff 48 89 5c 24 28 48 8b 1b 4c 8d 7b 08 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 34 d6 d7 ff 4d 8b 3f 4c 89 fe 48
RSP: 0018:ffffc9000e54f868 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff84b970d9
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff88802b59bde0
RBP: 0000000000009801 R08: ffff88802b59be3f R09: 1ffff110056b37c7
R10: dffffc0000000000 R11: ffffed10056b37c8 R12: dffffc0000000000
R13: ffff88802b59bdc0 R14: ffff8880767c18c0 R15: 0000000000000008
FS:  0000000000000000(0000) GS:ffff888124ccd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3a45569dc0 CR3: 000000007f14c000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	c1 e8 03             	shr    $0x3,%eax
   3:	48 89 44 24 18       	mov    %rax,0x18(%rsp)
   8:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1)
   d:	74 08                	je     0x17
   f:	48 89 df             	mov    %rbx,%rdi
  12:	e8 56 d6 d7 ff       	call   0xffd7d66d
  17:	48 89 5c 24 28       	mov    %rbx,0x28(%rsp)
  1c:	48 8b 1b             	mov    (%rbx),%rbx
  1f:	4c 8d 7b 08          	lea    0x8(%rbx),%r15
  23:	4c 89 f8             	mov    %r15,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 ff             	mov    %r15,%rdi
  34:	e8 34 d6 d7 ff       	call   0xffd7d66d
  39:	4d 8b 3f             	mov    (%r15),%r15
  3c:	4c 89 fe             	mov    %r15,%rsi
  3f:	48                   	rex.W


Warning: Permanently added '10.128.1.164' (ED25519) to the list of known hosts.
2026/08/31 20:30:29 parsed 1 programs
[  129.365739][ T5635] cgroup: Unknown subsys name 'net'
[  129.450114][ T5635] cgroup: Unknown subsys name 'cpuset'
[  129.460924][ T5635] cgroup: Unknown subsys name 'rlimit'
Setting up swapspace version 1, size = 127995904 bytes
[  131.308526][ T5635] Adding 124996k swap on ./swap-file.  Priority:0 extents:1 across:124996k 
[  134.859812][ T4949] Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] SMP KASAN PTI
[  134.873653][ T4949] KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
[  134.882647][ T4949] CPU: 0 UID: 0 PID: 4949 Comm: jbd2/sda1-8 Not tainted syzkaller #0 PREEMPT(full) 
[  134.892248][ T4949] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
[  134.902795][ T4949] RIP: 0010:__bh_submit+0x22d/0x8d0
[  134.908304][ T4949] Code: c1 e8 03 48 89 44 24 18 42 80 3c 20 00 74 08 48 89 df e8 56 d6 d7 ff 48 89 5c 24 28 48 8b 1b 4c 8d 7b 08 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 34 d6 d7 ff 4d 8b 3f 4c 89 fe 48
[  134.930751][ T4949] RSP: 0018:ffffc9000e54f868 EFLAGS: 00010202
[  134.938446][ T4949] RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff84b970d9
[  134.947354][ T4949] RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff88802b59bde0
[  134.956509][ T4949] RBP: 0000000000009801 R08: ffff88802b59be3f R09: 1ffff110056b37c7
[  134.964968][ T4949] R10: dffffc0000000000 R11: ffffed10056b37c8 R12: dffffc0000000000
[  134.974039][ T4949] R13: ffff88802b59bdc0 R14: ffff8880767c18c0 R15: 0000000000000008
[  134.983033][ T4949] FS:  0000000000000000(0000) GS:ffff888124ccd000(0000) knlGS:0000000000000000
[  134.992454][ T4949] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  134.999478][ T4949] CR2: 00007f3a45802008 CR3: 0000000073b10000 CR4: 00000000003526f0
[  135.008510][ T4949] Call Trace:
[  135.012421][ T4949]  <TASK>
[  135.015587][ T4949]  ? __pfx_journal_end_buffer_io_sync+0x10/0x10
[  135.022838][ T4949]  jbd2_journal_commit_transaction+0x22a9/0x5cd0
[  135.029753][ T4949]  ? trace_hrtimer_start+0x82/0x200
[  135.035414][ T4949]  ? __pfx_jbd2_journal_commit_transaction+0x10/0x10
[  135.042588][ T4949]  ? __pfx_do_raw_spin_lock+0x10/0x10
[  135.049933][ T4949]  ? _raw_spin_unlock_irqrestore+0x30/0x80
[  135.056765][ T4949]  ? _raw_spin_unlock_irqrestore+0x4c/0x80
[  135.063195][ T4949]  ? __timer_delete_sync+0x4a7/0x520
[  135.069319][ T4949]  kjournald2+0x3bc/0x750
[  135.074014][ T4949]  ? __pfx_kjournald2+0x10/0x10
[  135.079442][ T4949]  ? __pfx_autoremove_wake_function+0x10/0x10
[  135.085925][ T4949]  ? __kthread_parkme+0x71/0x1f0
[  135.091100][ T4949]  ? __kthread_parkme+0x199/0x1f0
[  135.096452][ T4949]  kthread+0x38b/0x480
[  135.100766][ T4949]  ? __pfx_kjournald2+0x10/0x10
[  135.106079][ T4949]  ? __pfx_kthread+0x10/0x10
[  135.111067][ T4949]  ret_from_fork+0x514/0xb70
[  135.116224][ T4949]  ? __pfx_ret_from_fork+0x10/0x10
[  135.121764][ T4949]  ? __switch_to+0xc89/0x1420
[  135.127747][ T4949]  ? __pfx_kthread+0x10/0x10
[  135.132832][ T4949]  ret_from_fork_asm+0x1a/0x30
[  135.137681][ T4949]  </TASK>
[  135.140752][ T4949] Modules linked in:
[  135.145188][ T4949] ---[ end trace 0000000000000000 ]---
[  135.212547][ 
** replaying previous printk message **
[  135.212547][ T4949] RIP: 0010:__bh_submit+0x22d/0x8d0
[  135.212608][ T4949] Code: c1 e8 03 48 89 44 24 18 42 80 3c 20 00 74 08 48 89 df e8 56 d6 d7 ff 48 89 5c 24 28 48 8b 1b 4c 8d 7b 08 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 34 d6 d7 ff 4d 8b 3f 4c 89 fe 48
[  135.212853][ T4949] RSP: 0018:ffffc9000e54f868 EFLAGS: 00010202
[  135.213048][ T4949] RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff84b970d9
[  135.213195][ T4949] RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff88802b59bde0
[  135.214066][ T4949] RBP: 0000000000009801 R08: ffff88802b59be3f R09: 1ffff110056b37c7
[  135.214125][ T4949] R10: dffffc0000000000 R11: ffffed10056b37c8 R12: dffffc0000000000
[  135.214156][ T4949] R13: ffff88802b59bdc0 R14: ffff8880767c18c0 R15: 0000000000000008
[  135.214169][ T4949] FS:  0000000000000000(0000) GS:ffff888124ccd000(0000) knlGS:0000000000000000
[  135.214184][ T4949] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  135.214196][ T4949] CR2: 00007f3a45569dc0 CR3: 000000007f14c000 CR4: 00000000003526f0
[  135.214216][ T4949] Kernel panic - not syncing: Fatal exception
[  135.329017][ T4949] Kernel Offset: disabled
[  135.333389][ T4949] Rebooting in 86400 seconds..


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-build211727255=/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 d6526ea3e6a
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=d6526ea3e6ad9081c902859bbb80f9f840377cb4 -X github.com/google/syzkaller/prog.gitRevisionDate=20251126-113115"  ./sys/syz-sysgen | grep -q false || go install -ldflags="-s -w -X github.com/google/syzkaller/prog.GitRevision=d6526ea3e6ad9081c902859bbb80f9f840377cb4 -X github.com/google/syzkaller/prog.gitRevisionDate=20251126-113115"  ./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=d6526ea3e6ad9081c902859bbb80f9f840377cb4 -X github.com/google/syzkaller/prog.gitRevisionDate=20251126-113115"  -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=\"d6526ea3e6ad9081c902859bbb80f9f840377cb4\"
/usr/bin/ld: /tmp/ccR5Rt9K.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