Extracting prog: 3m49.91922741s
Minimizing prog: 10m25.190319042s
Simplifying prog options: 5m0.851481739s
Extracting C: 2m46.394279717s
Simplifying C: 0s


extracting reproducer from 1 programs
testing a last program of every proc
single: executing 1 programs separately with timeout 30s
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): memfd_create-mprotect-openat$cgroup_ro-write$binfmt_script
detailed listing:
executing program 0:
memfd_create(&(0x7f0000000000)='/dev/sda1\x00', 0x1)
mprotect(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1)
r0 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000000)='blkio.bfq.sectors_recursive\x00', 0x275a, 0x0)
write$binfmt_script(r0, &(0x7f0000000040), 0x208e24b)

program did not crash
program did not crash
single: failed to extract reproducer
single: executing 1 programs separately with timeout 6m0s
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): memfd_create-mprotect-openat$cgroup_ro-write$binfmt_script
detailed listing:
executing program 0:
memfd_create(&(0x7f0000000000)='/dev/sda1\x00', 0x1)
mprotect(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1)
r0 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000000)='blkio.bfq.sectors_recursive\x00', 0x275a, 0x0)
write$binfmt_script(r0, &(0x7f0000000040), 0x208e24b)

program crashed: general protection fault in __bh_submit
single: successfully extracted reproducer
found reproducer with 4 syscalls
minimizing guilty program
testing program (duration=1m21.011904464s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): memfd_create-mprotect-openat$cgroup_ro
detailed listing:
executing program 0:
memfd_create(&(0x7f0000000000)='/dev/sda1\x00', 0x1)
mprotect(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1)
openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000000)='blkio.bfq.sectors_recursive\x00', 0x275a, 0x0)

program did not crash
testing program (duration=1m21.011904464s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): memfd_create-mprotect-write$binfmt_script
detailed listing:
executing program 0:
memfd_create(&(0x7f0000000000)='/dev/sda1\x00', 0x1)
mprotect(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1)
write$binfmt_script(0xffffffffffffffff, &(0x7f0000000040), 0x208e24b)

program did not crash
testing program (duration=1m21.011904464s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): memfd_create-openat$cgroup_ro-write$binfmt_script
detailed listing:
executing program 0:
memfd_create(&(0x7f0000000000)='/dev/sda1\x00', 0x1)
r0 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000000)='blkio.bfq.sectors_recursive\x00', 0x275a, 0x0)
write$binfmt_script(r0, &(0x7f0000000040), 0x208e24b)

program did not crash
testing program (duration=1m21.011904464s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mprotect-openat$cgroup_ro-write$binfmt_script
detailed listing:
executing program 0:
mprotect(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1)
r0 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000000)='blkio.bfq.sectors_recursive\x00', 0x275a, 0x0)
write$binfmt_script(r0, &(0x7f0000000040), 0x208e24b)

program crashed: general protection fault in __bh_submit
testing program (duration=1m21.011904464s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mprotect-openat$cgroup_ro-write$binfmt_script
detailed listing:
executing program 0:
mprotect(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1)
r0 = openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
write$binfmt_script(r0, &(0x7f0000000040), 0x208e24b)

program did not crash
testing program (duration=1m21.011904464s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mprotect-openat$cgroup_ro-write$binfmt_script
detailed listing:
executing program 0:
mprotect(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1)
r0 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000000)='blkio.bfq.sectors_recursive\x00', 0x275a, 0x0)
write$binfmt_script(r0, 0x0, 0x0)

program did not crash
extracting C reproducer
testing compiled C program (duration=1m21.011904464s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mprotect-openat$cgroup_ro-write$binfmt_script
program did not crash
simplifying guilty program options
testing program (duration=1m21.011904464s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mprotect-openat$cgroup_ro-write$binfmt_script
detailed listing:
executing program 0:
mprotect(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1)
r0 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000000)='blkio.bfq.sectors_recursive\x00', 0x275a, 0x0)
write$binfmt_script(r0, &(0x7f0000000040), 0x208e24b)

program crashed: general protection fault in __bh_submit
extracting C reproducer
testing compiled C program (duration=1m21.011904464s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mprotect-openat$cgroup_ro-write$binfmt_script
program did not crash
testing program (duration=1m21.011904464s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mprotect-openat$cgroup_ro-write$binfmt_script
detailed listing:
executing program 0:
mprotect(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1)
r0 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000000)='blkio.bfq.sectors_recursive\x00', 0x275a, 0x0)
write$binfmt_script(r0, &(0x7f0000000040), 0x208e24b)

program did not crash
testing program (duration=1m21.011904464s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mprotect-openat$cgroup_ro-write$binfmt_script
detailed listing:
executing program 0:
mprotect(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1)
r0 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000000)='blkio.bfq.sectors_recursive\x00', 0x275a, 0x0)
write$binfmt_script(r0, &(0x7f0000000040), 0x208e24b)

program crashed: general protection fault in __bh_submit
validation run: crashed=true
testing program (duration=1m21.011904464s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mprotect-openat$cgroup_ro-write$binfmt_script
detailed listing:
executing program 0:
mprotect(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1)
r0 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000000)='blkio.bfq.sectors_recursive\x00', 0x275a, 0x0)
write$binfmt_script(r0, &(0x7f0000000040), 0x208e24b)

program did not crash
validation run: crashed=false
testing program (duration=1m21.011904464s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mprotect-openat$cgroup_ro-write$binfmt_script
detailed listing:
executing program 0:
mprotect(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1)
r0 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000000)='blkio.bfq.sectors_recursive\x00', 0x275a, 0x0)
write$binfmt_script(r0, &(0x7f0000000040), 0x208e24b)

program did not crash
validation run: crashed=false
testing program (duration=1m21.011904464s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mprotect-openat$cgroup_ro-write$binfmt_script
detailed listing:
executing program 0:
mprotect(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1)
r0 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000000)='blkio.bfq.sectors_recursive\x00', 0x275a, 0x0)
write$binfmt_script(r0, &(0x7f0000000040), 0x208e24b)

program did not crash
validation run: crashed=false
testing program (duration=1m21.011904464s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mprotect-openat$cgroup_ro-write$binfmt_script
detailed listing:
executing program 0:
mprotect(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1)
r0 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000000)='blkio.bfq.sectors_recursive\x00', 0x275a, 0x0)
write$binfmt_script(r0, &(0x7f0000000040), 0x208e24b)

program did not crash
validation run: crashed=false
testing program (duration=1m21.011904464s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mprotect-openat$cgroup_ro-write$binfmt_script
detailed listing:
executing program 0:
mprotect(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1)
r0 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000000)='blkio.bfq.sectors_recursive\x00', 0x275a, 0x0)
write$binfmt_script(r0, &(0x7f0000000040), 0x208e24b)

program crashed: general protection fault in __bh_submit
validation run: crashed=true
testing program (duration=1m21.011904464s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mprotect-openat$cgroup_ro-write$binfmt_script
detailed listing:
executing program 0:
mprotect(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1)
r0 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000000)='blkio.bfq.sectors_recursive\x00', 0x275a, 0x0)
write$binfmt_script(r0, &(0x7f0000000040), 0x208e24b)

program crashed: general protection fault in __bh_submit
validation run: crashed=true
reproducing took 32m17.822037632s
repro crashed as (corrupted=false):
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: 4942 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: 0000:ffffc9000e397868 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff84b9a0d9
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff88807688fca0
RBP: 0000000000009801 R08: ffff88807688fcff R09: 1ffff1100ed11f9f
R10: dffffc0000000000 R11: ffffed100ed11fa0 R12: dffffc0000000000
R13: ffff88807688fc80 R14: ffff888077791d20 R15: 0000000000000008
FS:  0000000000000000(0000) GS:ffff888124866000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b34263fff CR3: 000000002acb2000 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: 0000:ffffc9000e397868 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff84b9a0d9
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff88807688fca0
RBP: 0000000000009801 R08: ffff88807688fcff R09: 1ffff1100ed11f9f
R10: dffffc0000000000 R11: ffffed100ed11fa0 R12: dffffc0000000000
R13: ffff88807688fc80 R14: ffff888077791d20 R15: 0000000000000008
FS:  0000000000000000(0000) GS:ffff888124866000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000043 CR3: 000000000ed48000 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

final repro crashed as (corrupted=false):
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: 4942 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: 0000:ffffc9000e397868 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff84b9a0d9
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff88807688fca0
RBP: 0000000000009801 R08: ffff88807688fcff R09: 1ffff1100ed11f9f
R10: dffffc0000000000 R11: ffffed100ed11fa0 R12: dffffc0000000000
R13: ffff88807688fc80 R14: ffff888077791d20 R15: 0000000000000008
FS:  0000000000000000(0000) GS:ffff888124866000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b34263fff CR3: 000000002acb2000 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: 0000:ffffc9000e397868 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff84b9a0d9
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff88807688fca0
RBP: 0000000000009801 R08: ffff88807688fcff R09: 1ffff1100ed11f9f
R10: dffffc0000000000 R11: ffffed100ed11fa0 R12: dffffc0000000000
R13: ffff88807688fc80 R14: ffff888077791d20 R15: 0000000000000008
FS:  0000000000000000(0000) GS:ffff888124866000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000043 CR3: 000000000ed48000 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