Extracting prog: 6m3.661714969s
Minimizing prog: 20m44.59376957s
Simplifying prog options: 4m12.600790965s
Extracting C: 2m9.832707538s
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}}): socket$inet-socket$pppl2tp-connect$pppl2tp-mkdirat-mount-openat-read-read
detailed listing:
executing program 0:
r0 = socket$inet(0x2, 0x2, 0x11)
r1 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r1, &(0x7f0000000100)=@pppol2tp={0x18, 0x1, {0x0, r0, {0x2, 0x115c, @loopback}, 0x1, 0x0, 0x1}}, 0x26)
mkdirat(0xffffffffffffff9c, &(0x7f0000000040)='./proc\x00', 0x1ff)
mount(0x0, &(0x7f0000000080)='./proc\x00', &(0x7f00000000c0)='proc\x00', 0x0, 0x0)
r2 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/net/pppol2tp\x00', 0x0, 0x0)
read(r2, &(0x7f0000000300), 0x1)
read(r2, &(0x7f0000000500), 0x1000)
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}}): socket$inet-socket$pppl2tp-connect$pppl2tp-mkdirat-mount-openat-read-read
detailed listing:
executing program 0:
r0 = socket$inet(0x2, 0x2, 0x11)
r1 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r1, &(0x7f0000000100)=@pppol2tp={0x18, 0x1, {0x0, r0, {0x2, 0x115c, @loopback}, 0x1, 0x0, 0x1}}, 0x26)
mkdirat(0xffffffffffffff9c, &(0x7f0000000040)='./proc\x00', 0x1ff)
mount(0x0, &(0x7f0000000080)='./proc\x00', &(0x7f00000000c0)='proc\x00', 0x0, 0x0)
r2 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/net/pppol2tp\x00', 0x0, 0x0)
read(r2, &(0x7f0000000300), 0x1)
read(r2, &(0x7f0000000500), 0x1000)
VM was preempted during syz execution: failed to run command in VM: instance is preempted, retrying
program crashed: general protection fault in __bh_submit
single: successfully extracted reproducer
found reproducer with 8 syscalls
minimizing guilty program
testing program (duration=1m58.789779176s, {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}}): socket$inet-socket$pppl2tp-connect$pppl2tp-mkdirat-mount-openat-read
detailed listing:
executing program 0:
r0 = socket$inet(0x2, 0x2, 0x11)
r1 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r1, &(0x7f0000000100)=@pppol2tp={0x18, 0x1, {0x0, r0, {0x2, 0x115c, @loopback}, 0x1, 0x0, 0x1}}, 0x26)
mkdirat(0xffffffffffffff9c, &(0x7f0000000040)='./proc\x00', 0x1ff)
mount(0x0, &(0x7f0000000080)='./proc\x00', &(0x7f00000000c0)='proc\x00', 0x0, 0x0)
r2 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/net/pppol2tp\x00', 0x0, 0x0)
read(r2, &(0x7f0000000300), 0x1)
program did not crash
testing program (duration=1m58.789779176s, {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}}): socket$inet-socket$pppl2tp-connect$pppl2tp-mkdirat-mount-openat-read
detailed listing:
executing program 0:
r0 = socket$inet(0x2, 0x2, 0x11)
r1 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r1, &(0x7f0000000100)=@pppol2tp={0x18, 0x1, {0x0, r0, {0x2, 0x115c, @loopback}, 0x1, 0x0, 0x1}}, 0x26)
mkdirat(0xffffffffffffff9c, &(0x7f0000000040)='./proc\x00', 0x1ff)
mount(0x0, &(0x7f0000000080)='./proc\x00', &(0x7f00000000c0)='proc\x00', 0x0, 0x0)
r2 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/net/pppol2tp\x00', 0x0, 0x0)
read(r2, &(0x7f0000000500), 0x1000)
program did not crash
testing program (duration=1m58.789779176s, {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}}): socket$inet-socket$pppl2tp-connect$pppl2tp-mkdirat-mount-read-read
detailed listing:
executing program 0:
r0 = socket$inet(0x2, 0x2, 0x11)
r1 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r1, &(0x7f0000000100)=@pppol2tp={0x18, 0x1, {0x0, r0, {0x2, 0x115c, @loopback}, 0x1, 0x0, 0x1}}, 0x26)
mkdirat(0xffffffffffffff9c, &(0x7f0000000040)='./proc\x00', 0x1ff)
mount(0x0, &(0x7f0000000080)='./proc\x00', &(0x7f00000000c0)='proc\x00', 0x0, 0x0)
read(0xffffffffffffffff, &(0x7f0000000300), 0x1)
read(0xffffffffffffffff, &(0x7f0000000500), 0x1000)
program did not crash
testing program (duration=1m58.789779176s, {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}}): socket$inet-socket$pppl2tp-connect$pppl2tp-mkdirat-openat-read-read
detailed listing:
executing program 0:
r0 = socket$inet(0x2, 0x2, 0x11)
r1 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r1, &(0x7f0000000100)=@pppol2tp={0x18, 0x1, {0x0, r0, {0x2, 0x115c, @loopback}, 0x1, 0x0, 0x1}}, 0x26)
mkdirat(0xffffffffffffff9c, &(0x7f0000000040)='./proc\x00', 0x1ff)
r2 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/net/pppol2tp\x00', 0x0, 0x0)
read(r2, &(0x7f0000000300), 0x1)
read(r2, &(0x7f0000000500), 0x1000)
program crashed: general protection fault in __bh_submit
testing program (duration=1m58.789779176s, {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}}): socket$inet-socket$pppl2tp-connect$pppl2tp-openat-read-read
detailed listing:
executing program 0:
r0 = socket$inet(0x2, 0x2, 0x11)
r1 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r1, &(0x7f0000000100)=@pppol2tp={0x18, 0x1, {0x0, r0, {0x2, 0x115c, @loopback}, 0x1, 0x0, 0x1}}, 0x26)
r2 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/net/pppol2tp\x00', 0x0, 0x0)
read(r2, &(0x7f0000000300), 0x1)
read(r2, &(0x7f0000000500), 0x1000)
program crashed: general protection fault in __bh_submit
testing program (duration=1m58.789779176s, {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}}): socket$inet-socket$pppl2tp-openat-read-read
detailed listing:
executing program 0:
socket$inet(0x2, 0x2, 0x11)
socket$pppl2tp(0x18, 0x1, 0x1)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/net/pppol2tp\x00', 0x0, 0x0)
read(r0, &(0x7f0000000300), 0x1)
read(r0, &(0x7f0000000500), 0x1000)
program crashed: general protection fault in __bh_submit
testing program (duration=1m58.789779176s, {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}}): socket$inet-openat-read-read
detailed listing:
executing program 0:
socket$inet(0x2, 0x2, 0x11)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/net/pppol2tp\x00', 0x0, 0x0)
read(r0, &(0x7f0000000300), 0x1)
read(r0, &(0x7f0000000500), 0x1000)
program crashed: general protection fault in __bh_submit
testing program (duration=1m58.789779176s, {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}}): openat-read-read
detailed listing:
executing program 0:
r0 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./proc/net/pppol2tp\x00', 0x0, 0x0)
read(r0, &(0x7f0000000300), 0x1)
read(r0, &(0x7f0000000500), 0x1000)
program did not crash
testing program (duration=1m58.789779176s, {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}}): socket$inet-openat-read-read
detailed listing:
executing program 0:
socket$inet(0x2, 0x2, 0x11)
r0 = openat(0xffffffffffffff9c, 0x0, 0x0, 0x0)
read(r0, &(0x7f0000000300), 0x1)
read(r0, &(0x7f0000000500), 0x1000)
program crashed: general protection fault in __bh_submit
testing program (duration=1m58.789779176s, {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}}): socket$inet-openat-read-read
detailed listing:
executing program 0:
socket$inet(0x2, 0x2, 0x11)
r0 = openat(0xffffffffffffff9c, 0x0, 0x0, 0x0)
read(r0, 0x0, 0x0)
read(r0, &(0x7f0000000500), 0x1000)
program crashed: general protection fault in __bh_submit
testing program (duration=1m58.789779176s, {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}}): socket$inet-openat-read-read
detailed listing:
executing program 0:
socket$inet(0x2, 0x2, 0x11)
r0 = openat(0xffffffffffffff9c, 0x0, 0x0, 0x0)
read(r0, 0x0, 0x0)
read(r0, 0x0, 0x0)
program did not crash
extracting C reproducer
testing compiled C program (duration=1m58.789779176s, {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}}): socket$inet-openat-read-read
program did not crash
simplifying guilty program options
testing program (duration=1m58.789779176s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet-openat-read-read
detailed listing:
executing program 0:
socket$inet(0x2, 0x2, 0x11)
r0 = openat(0xffffffffffffff9c, 0x0, 0x0, 0x0)
read(r0, 0x0, 0x0)
read(r0, &(0x7f0000000500), 0x1000)
program did not crash
testing program (duration=1m58.789779176s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet-openat-read-read
detailed listing:
executing program 0:
socket$inet(0x2, 0x2, 0x11)
r0 = openat(0xffffffffffffff9c, 0x0, 0x0, 0x0)
read(r0, 0x0, 0x0)
read(r0, &(0x7f0000000500), 0x1000)
program did not crash
testing program (duration=1m58.789779176s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet-openat-read-read
detailed listing:
executing program 0:
socket$inet(0x2, 0x2, 0x11)
r0 = openat(0xffffffffffffff9c, 0x0, 0x0, 0x0)
read(r0, 0x0, 0x0)
read(r0, &(0x7f0000000500), 0x1000)
program did not crash
validation run: crashed=false
testing program (duration=1m58.789779176s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet-openat-read-read
detailed listing:
executing program 0:
socket$inet(0x2, 0x2, 0x11)
r0 = openat(0xffffffffffffff9c, 0x0, 0x0, 0x0)
read(r0, 0x0, 0x0)
read(r0, &(0x7f0000000500), 0x1000)
program crashed: general protection fault in __bh_submit
validation run: crashed=true
testing program (duration=1m58.789779176s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet-openat-read-read
detailed listing:
executing program 0:
socket$inet(0x2, 0x2, 0x11)
r0 = openat(0xffffffffffffff9c, 0x0, 0x0, 0x0)
read(r0, 0x0, 0x0)
read(r0, &(0x7f0000000500), 0x1000)
program crashed: general protection fault in __bh_submit
validation run: crashed=true
testing program (duration=1m58.789779176s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet-openat-read-read
detailed listing:
executing program 0:
socket$inet(0x2, 0x2, 0x11)
r0 = openat(0xffffffffffffff9c, 0x0, 0x0, 0x0)
read(r0, 0x0, 0x0)
read(r0, &(0x7f0000000500), 0x1000)
program crashed: general protection fault in __bh_submit
validation run: crashed=true
reproducing took 39m2.608763553s
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: 4945 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:600 [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 f6 e7 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 d4 e7 d7 ff 4d 8b 3f 4c 89 fe 48
RSP: 0018:ffffc90008cff868 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff84b9d9a9
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff88802636a520
RBP: 0000000000009801 R08: ffff88802636a57f R09: 1ffff11004c6d4af
R10: dffffc0000000000 R11: ffffed1004c6d4b0 R12: dffffc0000000000
R13: ffff88802636a500 R14: ffff888070c72540 R15: 0000000000000008
FS: 0000000000000000(0000) GS:ffff88812485b000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe0bcb3d90 CR3: 0000000070a02000 CR4: 00000000003526f0
Call Trace:
jbd2_journal_commit_transaction+0x2285/0x5c80 fs/jbd2/commit.c:751
kjournald2+0x3bc/0x740 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:600 [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 f6 e7 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 d4 e7 d7 ff 4d 8b 3f 4c 89 fe 48
RSP: 0018:ffffc90008cff868 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff84b9d9a9
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff88802636a520
RBP: 0000000000009801 R08: ffff88802636a57f R09: 1ffff11004c6d4af
R10: dffffc0000000000 R11: ffffed1004c6d4b0 R12: dffffc0000000000
R13: ffff88802636a500 R14: ffff888070c72540 R15: 0000000000000008
FS: 0000000000000000(0000) GS:ffff88812485b000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f921bf5da08 CR3: 000000007f196000 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 f6 e7 d7 ff call 0xffd7e80d
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 d4 e7 d7 ff call 0xffd7e80d
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: 4945 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:600 [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 f6 e7 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 d4 e7 d7 ff 4d 8b 3f 4c 89 fe 48
RSP: 0018:ffffc90008cff868 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff84b9d9a9
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff88802636a520
RBP: 0000000000009801 R08: ffff88802636a57f R09: 1ffff11004c6d4af
R10: dffffc0000000000 R11: ffffed1004c6d4b0 R12: dffffc0000000000
R13: ffff88802636a500 R14: ffff888070c72540 R15: 0000000000000008
FS: 0000000000000000(0000) GS:ffff88812485b000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe0bcb3d90 CR3: 0000000070a02000 CR4: 00000000003526f0
Call Trace:
jbd2_journal_commit_transaction+0x2285/0x5c80 fs/jbd2/commit.c:751
kjournald2+0x3bc/0x740 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:600 [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 f6 e7 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 d4 e7 d7 ff 4d 8b 3f 4c 89 fe 48
RSP: 0018:ffffc90008cff868 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff84b9d9a9
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff88802636a520
RBP: 0000000000009801 R08: ffff88802636a57f R09: 1ffff11004c6d4af
R10: dffffc0000000000 R11: ffffed1004c6d4b0 R12: dffffc0000000000
R13: ffff88802636a500 R14: ffff888070c72540 R15: 0000000000000008
FS: 0000000000000000(0000) GS:ffff88812485b000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f921bf5da08 CR3: 000000007f196000 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 f6 e7 d7 ff call 0xffd7e80d
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 d4 e7 d7 ff call 0xffd7e80d
39: 4d 8b 3f mov (%r15),%r15
3c: 4c 89 fe mov %r15,%rsi
3f: 48 rex.W