Extracting prog: 4m36.272452375s
Minimizing prog: 19m53.548614955s
Simplifying prog options: 9m44.522186351s
Extracting C: 3m30.677391572s
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}}): mkdirat-mount-openat-write-syz_clone-openat$cgroup_ro
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f00000001c0)='./debug\x00', 0x1ff)
mount(0x0, &(0x7f0000000240)='./debug\x00', &(0x7f0000000280)='debugfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000300)='./debug/bluetooth/hci0/force_devcoredump\x00', 0x2, 0x0)
write(r0, 0x0, 0x0)
syz_clone(0x11, 0x0, 0x0, 0x0, 0x0, 0x0)
openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
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}}): mkdirat-mount-openat-write-syz_clone-openat$cgroup_ro
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f00000001c0)='./debug\x00', 0x1ff)
mount(0x0, &(0x7f0000000240)='./debug\x00', &(0x7f0000000280)='debugfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000300)='./debug/bluetooth/hci0/force_devcoredump\x00', 0x2, 0x0)
write(r0, 0x0, 0x0)
syz_clone(0x11, 0x0, 0x0, 0x0, 0x0, 0x0)
openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
program crashed: general protection fault in __bh_submit
single: successfully extracted reproducer
found reproducer with 6 syscalls
minimizing guilty program
testing program (duration=3m22.69883679s, {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}}): mkdirat-mount-openat-write-syz_clone
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f00000001c0)='./debug\x00', 0x1ff)
mount(0x0, &(0x7f0000000240)='./debug\x00', &(0x7f0000000280)='debugfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000300)='./debug/bluetooth/hci0/force_devcoredump\x00', 0x2, 0x0)
write(r0, 0x0, 0x0)
syz_clone(0x11, 0x0, 0x0, 0x0, 0x0, 0x0)
program did not crash
testing program (duration=3m22.69883679s, {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}}): mkdirat-mount-openat-write-openat$cgroup_ro
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f00000001c0)='./debug\x00', 0x1ff)
mount(0x0, &(0x7f0000000240)='./debug\x00', &(0x7f0000000280)='debugfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000300)='./debug/bluetooth/hci0/force_devcoredump\x00', 0x2, 0x0)
write(r0, 0x0, 0x0)
openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
program did not crash
testing program (duration=3m22.69883679s, {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}}): mkdirat-mount-openat-syz_clone-openat$cgroup_ro
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f00000001c0)='./debug\x00', 0x1ff)
mount(0x0, &(0x7f0000000240)='./debug\x00', &(0x7f0000000280)='debugfs\x00', 0x0, 0x0)
openat(0xffffffffffffff9c, &(0x7f0000000300)='./debug/bluetooth/hci0/force_devcoredump\x00', 0x2, 0x0)
syz_clone(0x11, 0x0, 0x0, 0x0, 0x0, 0x0)
openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
program did not crash
testing program (duration=3m22.69883679s, {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}}): mkdirat-mount-write-syz_clone-openat$cgroup_ro
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f00000001c0)='./debug\x00', 0x1ff)
mount(0x0, &(0x7f0000000240)='./debug\x00', &(0x7f0000000280)='debugfs\x00', 0x0, 0x0)
write(0xffffffffffffffff, 0x0, 0x0)
syz_clone(0x11, 0x0, 0x0, 0x0, 0x0, 0x0)
openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
program crashed: general protection fault in __bh_submit
testing program (duration=3m22.69883679s, {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}}): mkdirat-write-syz_clone-openat$cgroup_ro
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f00000001c0)='./debug\x00', 0x1ff)
write(0xffffffffffffffff, 0x0, 0x0)
syz_clone(0x11, 0x0, 0x0, 0x0, 0x0, 0x0)
openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
program crashed: general protection fault in __bh_submit
testing program (duration=3m22.69883679s, {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}}): write-syz_clone-openat$cgroup_ro
detailed listing:
executing program 0:
write(0xffffffffffffffff, 0x0, 0x0)
syz_clone(0x11, 0x0, 0x0, 0x0, 0x0, 0x0)
openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
program did not crash
testing program (duration=3m22.69883679s, {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}}): mkdirat-write-syz_clone-openat$cgroup_ro
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, 0x0, 0x1ff)
write(0xffffffffffffffff, 0x0, 0x0)
syz_clone(0x11, 0x0, 0x0, 0x0, 0x0, 0x0)
openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
program crashed: general protection fault in __bh_submit
extracting C reproducer
testing compiled C program (duration=3m22.69883679s, {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}}): mkdirat-write-syz_clone-openat$cgroup_ro
program did not crash
simplifying guilty program options
testing program (duration=3m22.69883679s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-write-syz_clone-openat$cgroup_ro
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, 0x0, 0x1ff)
write(0xffffffffffffffff, 0x0, 0x0)
syz_clone(0x11, 0x0, 0x0, 0x0, 0x0, 0x0)
openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
VM was preempted during syz execution: failed to run command in VM: instance is preempted, retrying
program crashed: general protection fault in __bh_submit
extracting C reproducer
testing compiled C program (duration=3m22.69883679s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-write-syz_clone-openat$cgroup_ro
program did not crash
testing program (duration=3m22.69883679s, {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}}): mkdirat-write-syz_clone-openat$cgroup_ro
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, 0x0, 0x1ff)
write(0xffffffffffffffff, 0x0, 0x0)
syz_clone(0x11, 0x0, 0x0, 0x0, 0x0, 0x0)
openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
program did not crash
testing program (duration=3m22.69883679s, {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}}): mkdirat-write-syz_clone-openat$cgroup_ro
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, 0x0, 0x1ff)
write(0xffffffffffffffff, 0x0, 0x0)
syz_clone(0x11, 0x0, 0x0, 0x0, 0x0, 0x0)
openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
program crashed: general protection fault in __bh_submit
validation run: crashed=true
testing program (duration=3m22.69883679s, {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}}): mkdirat-write-syz_clone-openat$cgroup_ro
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, 0x0, 0x1ff)
write(0xffffffffffffffff, 0x0, 0x0)
syz_clone(0x11, 0x0, 0x0, 0x0, 0x0, 0x0)
openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
program did not crash
validation run: crashed=false
testing program (duration=3m22.69883679s, {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}}): mkdirat-write-syz_clone-openat$cgroup_ro
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, 0x0, 0x1ff)
write(0xffffffffffffffff, 0x0, 0x0)
syz_clone(0x11, 0x0, 0x0, 0x0, 0x0, 0x0)
openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
program crashed: general protection fault in __bh_submit
validation run: crashed=true
testing program (duration=3m22.69883679s, {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}}): mkdirat-write-syz_clone-openat$cgroup_ro
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, 0x0, 0x1ff)
write(0xffffffffffffffff, 0x0, 0x0)
syz_clone(0x11, 0x0, 0x0, 0x0, 0x0, 0x0)
openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
program did not crash
validation run: crashed=false
testing program (duration=3m22.69883679s, {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}}): mkdirat-write-syz_clone-openat$cgroup_ro
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, 0x0, 0x1ff)
write(0xffffffffffffffff, 0x0, 0x0)
syz_clone(0x11, 0x0, 0x0, 0x0, 0x0, 0x0)
openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
program crashed: general protection fault in __bh_submit
validation run: crashed=true
reproducing took 50m22.744942326s
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: 4943 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:ffffc90010277868 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff84b9a0d9
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff88807091fa20
RBP: 0000000000009801 R08: ffff88807091fa7f R09: 1ffff1100e123f4f
R10: dffffc0000000000 R11: ffffed100e123f50 R12: dffffc0000000000
R13: ffff88807091fa00 R14: ffff8880700542a0 R15: 0000000000000008
FS: 0000000000000000(0000) GS:ffff888124866000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff118070000 CR3: 000000007f9c8000 CR4: 00000000003526f0
Call Trace:
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
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:ffffc90010277868 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff84b9a0d9
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff88807091fa20
RBP: 0000000000009801 R08: ffff88807091fa7f R09: 1ffff1100e123f4f
R10: dffffc0000000000 R11: ffffed100e123f50 R12: dffffc0000000000
R13: ffff88807091fa00 R14: ffff8880700542a0 R15: 0000000000000008
FS: 0000000000000000(0000) GS:ffff888124866000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000002bc10000 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: 4943 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:ffffc90010277868 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff84b9a0d9
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff88807091fa20
RBP: 0000000000009801 R08: ffff88807091fa7f R09: 1ffff1100e123f4f
R10: dffffc0000000000 R11: ffffed100e123f50 R12: dffffc0000000000
R13: ffff88807091fa00 R14: ffff8880700542a0 R15: 0000000000000008
FS: 0000000000000000(0000) GS:ffff888124866000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff118070000 CR3: 000000007f9c8000 CR4: 00000000003526f0
Call Trace:
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
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:ffffc90010277868 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff84b9a0d9
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff88807091fa20
RBP: 0000000000009801 R08: ffff88807091fa7f R09: 1ffff1100e123f4f
R10: dffffc0000000000 R11: ffffed100e123f50 R12: dffffc0000000000
R13: ffff88807091fa00 R14: ffff8880700542a0 R15: 0000000000000008
FS: 0000000000000000(0000) GS:ffff888124866000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000002bc10000 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