Extracting prog: 2m9.941878934s
Minimizing prog: 13m54.936445941s
Simplifying prog options: 0s
Extracting C: 50.562363887s
Simplifying C: 10m27.754566676s


extracting reproducer from 101 programs
first checking the prog from the crash report
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
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000240)='./debug\x00', 0xaf)
mount(0x0, &(0x7f0000000200)='./debug\x00', &(0x7f0000000300)='debugfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000400)='./debug/split_huge_pages\x00', 0x1, 0x0)
write(r0, &(0x7f0000000600)='/#0r7', 0x5)

program crashed: general protection fault in vsscanf
single: successfully extracted reproducer
found reproducer with 4 syscalls
minimizing guilty program
testing program (duration=45.493815921s, {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
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000240)='./debug\x00', 0xaf)
mount(0x0, &(0x7f0000000200)='./debug\x00', &(0x7f0000000300)='debugfs\x00', 0x0, 0x0)
openat(0xffffffffffffff9c, &(0x7f0000000400)='./debug/split_huge_pages\x00', 0x1, 0x0)

program did not crash
testing program (duration=45.493815921s, {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
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000240)='./debug\x00', 0xaf)
mount(0x0, &(0x7f0000000200)='./debug\x00', &(0x7f0000000300)='debugfs\x00', 0x0, 0x0)
write(0xffffffffffffffff, &(0x7f0000000600)='/#0r7', 0x5)

program did not crash
testing program (duration=45.493815921s, {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-openat-write
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000240)='./debug\x00', 0xaf)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000400)='./debug/split_huge_pages\x00', 0x1, 0x0)
write(r0, &(0x7f0000000600)='/#0r7', 0x5)

program did not crash
testing program (duration=45.493815921s, {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}}): mount-openat-write
detailed listing:
executing program 0:
mount(0x0, &(0x7f0000000200)='./debug\x00', &(0x7f0000000300)='debugfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000400)='./debug/split_huge_pages\x00', 0x1, 0x0)
write(r0, &(0x7f0000000600)='/#0r7', 0x5)

program did not crash
testing program (duration=45.493815921s, {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
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, 0x0, 0xaf)
mount(0x0, &(0x7f0000000200)='./debug\x00', &(0x7f0000000300)='debugfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000400)='./debug/split_huge_pages\x00', 0x1, 0x0)
write(r0, &(0x7f0000000600)='/#0r7', 0x5)

program did not crash
testing program (duration=45.493815921s, {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
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000240)='./debug\x00', 0xaf)
mount(0x0, 0x0, &(0x7f0000000300)='debugfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000400)='./debug/split_huge_pages\x00', 0x1, 0x0)
write(r0, &(0x7f0000000600)='/#0r7', 0x5)

program did not crash
testing program (duration=45.493815921s, {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
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000240)='./debug\x00', 0xaf)
mount(0x0, &(0x7f0000000200)='./debug\x00', 0x0, 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000400)='./debug/split_huge_pages\x00', 0x1, 0x0)
write(r0, &(0x7f0000000600)='/#0r7', 0x5)

program did not crash
testing program (duration=45.493815921s, {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
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000240)='./debug\x00', 0xaf)
mount(0x0, &(0x7f0000000200)='./debug\x00', &(0x7f0000000300)='debugfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, 0x0, 0x1, 0x0)
write(r0, &(0x7f0000000600)='/#0r7', 0x5)

program did not crash
testing program (duration=45.493815921s, {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
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000240)='./debug\x00', 0xaf)
mount(0x0, &(0x7f0000000200)='./debug\x00', &(0x7f0000000300)='debugfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000400)='./debug/split_huge_pages\x00', 0x1, 0x0)
write(r0, 0x0, 0x0)

program did not crash
testing program (duration=45.493815921s, {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
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000240)='./debug\x00', 0xaf)
mount(0x0, &(0x7f0000000200)='./debug\x00', &(0x7f0000000300)='debugfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000400)='./debug/split_huge_pages\x00', 0x1, 0x0)
write(r0, &(0x7f0000000600), 0x0)

program did not crash
extracting C reproducer
testing compiled C program (duration=45.493815921s, {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
program crashed: general protection fault in vsscanf
simplifying C reproducer
testing compiled C program (duration=45.493815921s, {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-mount-openat-write
program crashed: general protection fault in vsscanf
testing compiled C program (duration=45.493815921s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false 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
program crashed: general protection fault in vsscanf
testing compiled C program (duration=45.493815921s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:true Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write
program crashed: general protection fault in vsscanf
testing compiled C program (duration=45.493815921s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write
program crashed: general protection fault in vsscanf
testing compiled C program (duration=45.493815921s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write
program crashed: general protection fault in vsscanf
testing compiled C program (duration=45.493815921s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write
program crashed: general protection fault in vsscanf
testing compiled C program (duration=45.493815921s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write
program crashed: general protection fault in vsscanf
testing program (duration=45.493815921s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000240)='./debug\x00', 0xaf)
mount(0x0, &(0x7f0000000200)='./debug\x00', &(0x7f0000000300)='debugfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000400)='./debug/split_huge_pages\x00', 0x1, 0x0)
write(r0, &(0x7f0000000600)='/#0r7', 0x5)

program crashed: general protection fault in vsscanf
validation run: crashed=true
testing program (duration=45.493815921s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000240)='./debug\x00', 0xaf)
mount(0x0, &(0x7f0000000200)='./debug\x00', &(0x7f0000000300)='debugfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000400)='./debug/split_huge_pages\x00', 0x1, 0x0)
write(r0, &(0x7f0000000600)='/#0r7', 0x5)

program crashed: general protection fault in vsscanf
validation run: crashed=true
testing program (duration=45.493815921s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdirat-mount-openat-write
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000240)='./debug\x00', 0xaf)
mount(0x0, &(0x7f0000000200)='./debug\x00', &(0x7f0000000300)='debugfs\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000400)='./debug/split_huge_pages\x00', 0x1, 0x0)
write(r0, &(0x7f0000000600)='/#0r7', 0x5)

program crashed: general protection fault in vsscanf
validation run: crashed=true
reproducing took 32m26.499598019s
repro crashed as (corrupted=false):
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 5934 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:vsscanf+0x19a/0x2520 lib/vsprintf.c:3464
Code: 48 c7 c6 d0 6d 74 8e e8 64 72 07 f7 41 83 fe 25 74 4d 45 85 f6 0f 84 1e 22 00 00 48 ff c3 48 89 5c 24 78 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 bd 1b 00 00 41 0f b6 1f 45 0f b6 f6 44
RSP: 0018:ffffc900045d7640 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffff8ad68661 RCX: 0000000000000001
RDX: ffffffff8a80047c RSI: ffffffff8e746dd0 RDI: 0000000000000030
RBP: ffffc900045d7770 R08: ffff88802d400000 R09: 0000000000000002
R10: 0000000000000025 R11: 0000000000000000 R12: ffffffff8ad68660
R13: dffffc0000000000 R14: 0000000000000030 R15: 0000000000000000
FS:  0000555572a65500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3c6c470000 CR3: 00000000731d2000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 sscanf+0xe3/0x140 lib/vsprintf.c:3722
 split_huge_pages_write+0x391/0x1b60 mm/huge_memory.c:3179
 full_proxy_write+0x110/0x1c0 fs/debugfs/file.c:244
 vfs_write+0x299/0x9a0 fs/read_write.c:582
 ksys_write+0x151/0x260 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f3c6c59e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd71e9f288 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f3c6c825fa0 RCX: 00007f3c6c59e0d9
RDX: 0000000000000005 RSI: 0000200000000600 RDI: 0000000000000003
RBP: 00007f3c6c635024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3c6c825fac R14: 00007f3c6c825fa0 R15: 00007f3c6c825fa0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:vsscanf+0x19a/0x2520 lib/vsprintf.c:3464
Code: 48 c7 c6 d0 6d 74 8e e8 64 72 07 f7 41 83 fe 25 74 4d 45 85 f6 0f 84 1e 22 00 00 48 ff c3 48 89 5c 24 78 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 bd 1b 00 00 41 0f b6 1f 45 0f b6 f6 44
RSP: 0018:ffffc900045d7640 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffff8ad68661 RCX: 0000000000000001
RDX: ffffffff8a80047c RSI: ffffffff8e746dd0 RDI: 0000000000000030
RBP: ffffc900045d7770 R08: ffff88802d400000 R09: 0000000000000002
R10: 0000000000000025 R11: 0000000000000000 R12: ffffffff8ad68660
R13: dffffc0000000000 R14: 0000000000000030 R15: 0000000000000000
FS:  0000555572a65500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3c6c470000 CR3: 00000000731d2000 CR4: 00000000003506f0
----------------
Code disassembly (best guess):
   0:	48 c7 c6 d0 6d 74 8e 	mov    $0xffffffff8e746dd0,%rsi
   7:	e8 64 72 07 f7       	call   0xf7077270
   c:	41 83 fe 25          	cmp    $0x25,%r14d
  10:	74 4d                	je     0x5f
  12:	45 85 f6             	test   %r14d,%r14d
  15:	0f 84 1e 22 00 00    	je     0x2239
  1b:	48 ff c3             	inc    %rbx
  1e:	48 89 5c 24 78       	mov    %rbx,0x78(%rsp)
  23:	4c 89 f8             	mov    %r15,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 28       	movzbl (%rax,%r13,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 bd 1b 00 00    	jne    0x1bf4
  37:	41 0f b6 1f          	movzbl (%r15),%ebx
  3b:	45 0f b6 f6          	movzbl %r14b,%r14d
  3f:	44                   	rex.R

final repro crashed as (corrupted=false):
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 5934 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:vsscanf+0x19a/0x2520 lib/vsprintf.c:3464
Code: 48 c7 c6 d0 6d 74 8e e8 64 72 07 f7 41 83 fe 25 74 4d 45 85 f6 0f 84 1e 22 00 00 48 ff c3 48 89 5c 24 78 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 bd 1b 00 00 41 0f b6 1f 45 0f b6 f6 44
RSP: 0018:ffffc900045d7640 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffff8ad68661 RCX: 0000000000000001
RDX: ffffffff8a80047c RSI: ffffffff8e746dd0 RDI: 0000000000000030
RBP: ffffc900045d7770 R08: ffff88802d400000 R09: 0000000000000002
R10: 0000000000000025 R11: 0000000000000000 R12: ffffffff8ad68660
R13: dffffc0000000000 R14: 0000000000000030 R15: 0000000000000000
FS:  0000555572a65500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3c6c470000 CR3: 00000000731d2000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 sscanf+0xe3/0x140 lib/vsprintf.c:3722
 split_huge_pages_write+0x391/0x1b60 mm/huge_memory.c:3179
 full_proxy_write+0x110/0x1c0 fs/debugfs/file.c:244
 vfs_write+0x299/0x9a0 fs/read_write.c:582
 ksys_write+0x151/0x260 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f3c6c59e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd71e9f288 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f3c6c825fa0 RCX: 00007f3c6c59e0d9
RDX: 0000000000000005 RSI: 0000200000000600 RDI: 0000000000000003
RBP: 00007f3c6c635024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3c6c825fac R14: 00007f3c6c825fa0 R15: 00007f3c6c825fa0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:vsscanf+0x19a/0x2520 lib/vsprintf.c:3464
Code: 48 c7 c6 d0 6d 74 8e e8 64 72 07 f7 41 83 fe 25 74 4d 45 85 f6 0f 84 1e 22 00 00 48 ff c3 48 89 5c 24 78 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 bd 1b 00 00 41 0f b6 1f 45 0f b6 f6 44
RSP: 0018:ffffc900045d7640 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffff8ad68661 RCX: 0000000000000001
RDX: ffffffff8a80047c RSI: ffffffff8e746dd0 RDI: 0000000000000030
RBP: ffffc900045d7770 R08: ffff88802d400000 R09: 0000000000000002
R10: 0000000000000025 R11: 0000000000000000 R12: ffffffff8ad68660
R13: dffffc0000000000 R14: 0000000000000030 R15: 0000000000000000
FS:  0000555572a65500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3c6c470000 CR3: 00000000731d2000 CR4: 00000000003506f0
----------------
Code disassembly (best guess):
   0:	48 c7 c6 d0 6d 74 8e 	mov    $0xffffffff8e746dd0,%rsi
   7:	e8 64 72 07 f7       	call   0xf7077270
   c:	41 83 fe 25          	cmp    $0x25,%r14d
  10:	74 4d                	je     0x5f
  12:	45 85 f6             	test   %r14d,%r14d
  15:	0f 84 1e 22 00 00    	je     0x2239
  1b:	48 ff c3             	inc    %rbx
  1e:	48 89 5c 24 78       	mov    %rbx,0x78(%rsp)
  23:	4c 89 f8             	mov    %r15,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 28       	movzbl (%rax,%r13,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 bd 1b 00 00    	jne    0x1bf4
  37:	41 0f b6 1f          	movzbl (%r15),%ebx
  3b:	45 0f b6 f6          	movzbl %r14b,%r14d
  3f:	44                   	rex.R