Extracting prog: 1m12.25788173s
Minimizing prog: 8m9.124478175s
Simplifying prog options: 0s
Extracting C: 21.626843242s
Simplifying C: 5m16.39461635s
extracting reproducer from 70 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_kvm_add_vcpu$x86-madvise-userfaultfd-ioctl$UFFDIO_API-ioctl$UFFDIO_REGISTER-close
detailed listing:
executing program 0:
syz_kvm_add_vcpu$x86(0x0, &(0x7f0000000000)={0x0, 0x0, 0x190})
madvise(&(0x7f0000000000/0x600000)=nil, 0x600722, 0x19)
r0 = userfaultfd(0x80001)
ioctl$UFFDIO_API(r0, 0xc018aa3f, &(0x7f00000000c0))
ioctl$UFFDIO_REGISTER(r0, 0xc020aa00, &(0x7f0000000180)={{&(0x7f0000000000/0xc00000)=nil, 0xc00000}, 0x3})
close(0x3) (fail_nth: 1)
program crashed: BUG: unable to handle kernel paging request in can_vma_merge_left
single: successfully extracted reproducer
found reproducer with 6 syscalls
minimizing guilty program
testing program (duration=35.270134939s, {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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_kvm_add_vcpu$x86-madvise-userfaultfd-ioctl$UFFDIO_API-ioctl$UFFDIO_REGISTER
detailed listing:
executing program 0:
syz_kvm_add_vcpu$x86(0x0, &(0x7f0000000000)={0x0, 0x0, 0x190})
madvise(&(0x7f0000000000/0x600000)=nil, 0x600722, 0x19)
r0 = userfaultfd(0x80001)
ioctl$UFFDIO_API(r0, 0xc018aa3f, &(0x7f00000000c0))
ioctl$UFFDIO_REGISTER(r0, 0xc020aa00, &(0x7f0000000180)={{&(0x7f0000000000/0xc00000)=nil, 0xc00000}, 0x3})
program did not crash
testing program (duration=35.270134939s, {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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_kvm_add_vcpu$x86-madvise-userfaultfd-ioctl$UFFDIO_API-close
detailed listing:
executing program 0:
syz_kvm_add_vcpu$x86(0x0, &(0x7f0000000000)={0x0, 0x0, 0x190})
madvise(&(0x7f0000000000/0x600000)=nil, 0x600722, 0x19)
r0 = userfaultfd(0x80001)
ioctl$UFFDIO_API(r0, 0xc018aa3f, &(0x7f00000000c0))
close(0x3) (fail_nth: 1)
program did not crash
testing program (duration=35.270134939s, {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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_kvm_add_vcpu$x86-madvise-userfaultfd-ioctl$UFFDIO_REGISTER-close
detailed listing:
executing program 0:
syz_kvm_add_vcpu$x86(0x0, &(0x7f0000000000)={0x0, 0x0, 0x190})
madvise(&(0x7f0000000000/0x600000)=nil, 0x600722, 0x19)
r0 = userfaultfd(0x80001)
ioctl$UFFDIO_REGISTER(r0, 0xc020aa00, &(0x7f0000000180)={{&(0x7f0000000000/0xc00000)=nil, 0xc00000}, 0x3})
close(0x3) (fail_nth: 1)
program did not crash
testing program (duration=35.270134939s, {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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_kvm_add_vcpu$x86-madvise-ioctl$UFFDIO_API-ioctl$UFFDIO_REGISTER-close
detailed listing:
executing program 0:
syz_kvm_add_vcpu$x86(0x0, &(0x7f0000000000)={0x0, 0x0, 0x190})
madvise(&(0x7f0000000000/0x600000)=nil, 0x600722, 0x19)
ioctl$UFFDIO_API(0xffffffffffffffff, 0xc018aa3f, &(0x7f00000000c0))
ioctl$UFFDIO_REGISTER(0xffffffffffffffff, 0xc020aa00, &(0x7f0000000180)={{&(0x7f0000000000/0xc00000)=nil, 0xc00000}, 0x3})
close(0x3) (fail_nth: 1)
program did not crash
testing program (duration=35.270134939s, {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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_kvm_add_vcpu$x86-userfaultfd-ioctl$UFFDIO_API-ioctl$UFFDIO_REGISTER-close
detailed listing:
executing program 0:
syz_kvm_add_vcpu$x86(0x0, &(0x7f0000000000)={0x0, 0x0, 0x190})
r0 = userfaultfd(0x80001)
ioctl$UFFDIO_API(r0, 0xc018aa3f, &(0x7f00000000c0))
ioctl$UFFDIO_REGISTER(r0, 0xc020aa00, &(0x7f0000000180)={{&(0x7f0000000000/0xc00000)=nil, 0xc00000}, 0x3})
close(0x3) (fail_nth: 1)
program crashed: BUG: unable to handle kernel paging request in can_vma_merge_left
testing program (duration=35.270134939s, {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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): userfaultfd-ioctl$UFFDIO_API-ioctl$UFFDIO_REGISTER-close
detailed listing:
executing program 0:
r0 = userfaultfd(0x80001)
ioctl$UFFDIO_API(r0, 0xc018aa3f, &(0x7f00000000c0))
ioctl$UFFDIO_REGISTER(r0, 0xc020aa00, &(0x7f0000000180)={{&(0x7f0000000000/0xc00000)=nil, 0xc00000}, 0x3})
close(0x3) (fail_nth: 1)
program crashed: BUG: unable to handle kernel paging request in can_vma_merge_left
testing program (duration=35.270134939s, {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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): userfaultfd-ioctl$UFFDIO_API-ioctl$UFFDIO_REGISTER-close
detailed listing:
executing program 0:
r0 = userfaultfd(0x80001)
ioctl$UFFDIO_API(r0, 0xc018aa3f, &(0x7f00000000c0))
ioctl$UFFDIO_REGISTER(r0, 0xc020aa00, &(0x7f0000000180)={{&(0x7f0000000000/0xc00000)=nil, 0xc00000}, 0x3})
close(0x3)
program did not crash
testing program (duration=35.270134939s, {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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): userfaultfd-ioctl$UFFDIO_API-ioctl$UFFDIO_REGISTER-close
detailed listing:
executing program 0:
r0 = userfaultfd(0x80001)
ioctl$UFFDIO_API(r0, 0xc018aa3f, 0x0)
ioctl$UFFDIO_REGISTER(r0, 0xc020aa00, &(0x7f0000000180)={{&(0x7f0000000000/0xc00000)=nil, 0xc00000}, 0x3})
close(0x3) (fail_nth: 1)
program did not crash
testing program (duration=35.270134939s, {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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): userfaultfd-ioctl$UFFDIO_API-ioctl$UFFDIO_REGISTER-close
detailed listing:
executing program 0:
r0 = userfaultfd(0x80001)
ioctl$UFFDIO_API(r0, 0xc018aa3f, &(0x7f00000000c0))
ioctl$UFFDIO_REGISTER(r0, 0xc020aa00, 0x0)
close(0x3) (fail_nth: 1)
program did not crash
extracting C reproducer
testing compiled C program (duration=35.270134939s, {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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): userfaultfd-ioctl$UFFDIO_API-ioctl$UFFDIO_REGISTER-close
program crashed: BUG: unable to handle kernel paging request in can_vma_merge_left
simplifying C reproducer
testing compiled C program (duration=35.270134939s, {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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): userfaultfd-ioctl$UFFDIO_API-ioctl$UFFDIO_REGISTER-close
program crashed: BUG: unable to handle kernel paging request in can_vma_merge_left
testing compiled C program (duration=35.270134939s, {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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): userfaultfd-ioctl$UFFDIO_API-ioctl$UFFDIO_REGISTER-close
program crashed: BUG: unable to handle kernel paging request in can_vma_merge_left
testing compiled C program (duration=35.270134939s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): userfaultfd-ioctl$UFFDIO_API-ioctl$UFFDIO_REGISTER-close
program crashed: BUG: unable to handle kernel paging request in can_vma_merge_left
testing compiled C program (duration=35.270134939s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): userfaultfd-ioctl$UFFDIO_API-ioctl$UFFDIO_REGISTER-close
program crashed: BUG: unable to handle kernel paging request in can_vma_merge_left
testing compiled C program (duration=35.270134939s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): userfaultfd-ioctl$UFFDIO_API-ioctl$UFFDIO_REGISTER-close
program crashed: BUG: unable to handle kernel paging request in can_vma_merge_left
testing compiled C program (duration=35.270134939s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): userfaultfd-ioctl$UFFDIO_API-ioctl$UFFDIO_REGISTER-close
program crashed: BUG: unable to handle kernel paging request in can_vma_merge_left
reproducing took 14m59.403871517s
repro crashed as (corrupted=false):
RBP: 0000000000000001 R08: 00007fff3a5bc177 R09: 00007f1e75530031
R10: 0000000000000001 R11: 0000000000000246 R12: 00007f1e75539618
R13: 00007fff3a5bc5b8 R14: 0000000000000001 R15: 0000000000000001
BUG: unable to handle page fault for address: fffffffffffffffc
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 72ae067 P4D 72ae067 PUD 72b0067 PMD 0
Oops: Oops: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 0 UID: 0 PID: 290 Comm: syz-executor251 Not tainted 6.12.23-syzkaller-gd9fd901baa98 #0 f1acc3ef52b3e732a05c4f7a2560722db90bb473
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:can_vma_merge_left+0x6c/0x4c0 mm/vma.c:296
Code: ff 0f 84 2b 01 00 00 4d 8d 67 08 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 d4 28 08 00 <4d> 8b 24 24 4c 89 6d d0 49 83 c5 30 4c 89 e8 48 c1 e8 03 48 b9 00
RSP: 0018:ffffc9000113f8f8 EFLAGS: 00010246
RAX: 1fffffffffffffff RBX: ffffc9000113fa38 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc9000113fa20
RBP: ffffc9000113f938 R08: ffff888116c8b09f R09: 1ffff11022d91613
R10: dffffc0000000000 R11: ffffed1022d91614 R12: fffffffffffffffc
R13: ffffc9000113fa20 R14: 1ffff92000227f47 R15: fffffffffffffff4
FS: 00005555582e9380(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffffc CR3: 000000012de74000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
vma_merge_existing_range mm/vma.c:703 [inline]
vma_modify+0x250/0x1430 mm/vma.c:1427
vma_modify_flags_uffd+0x15a/0x190 mm/vma.c:1508
userfaultfd_clear_vma+0x1e8/0x260 mm/userfaultfd.c:1894
userfaultfd_release_all+0x280/0x490 mm/userfaultfd.c:2012
userfaultfd_release+0xe2/0x1a0 fs/userfaultfd.c:866
__fput+0x1fb/0xa00 fs/file_table.c:431
__fput_sync+0x4a/0x70 fs/file_table.c:516
__do_sys_close fs/open.c:1590 [inline]
__se_sys_close+0x17b/0x240 fs/open.c:1575
__x64_sys_close+0x3c/0x60 fs/open.c:1575
x64_sys_call+0x2560/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:4
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f1e754ce369
Code: 48 83 c4 28 c3 e8 17 1a 00 00 0f 1f 80 00 00 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff3a5bc3d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 00007fff3a5bc3e0 RCX: 00007f1e754ce369
RDX: 00007f1e754cd6a0 RSI: 00007fff3a5bc3e0 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00007fff3a5bc177 R09: 00007f1e75530031
R10: 0000000000000001 R11: 0000000000000246 R12: 00007f1e75539618
R13: 00007fff3a5bc5b8 R14: 0000000000000001 R15: 0000000000000001
Modules linked in:
CR2: fffffffffffffffc
---[ end trace 0000000000000000 ]---
RIP: 0010:can_vma_merge_left+0x6c/0x4c0 mm/vma.c:296
Code: ff 0f 84 2b 01 00 00 4d 8d 67 08 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 d4 28 08 00 <4d> 8b 24 24 4c 89 6d d0 49 83 c5 30 4c 89 e8 48 c1 e8 03 48 b9 00
RSP: 0018:ffffc9000113f8f8 EFLAGS: 00010246
RAX: 1fffffffffffffff RBX: ffffc9000113fa38 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc9000113fa20
RBP: ffffc9000113f938 R08: ffff888116c8b09f R09: 1ffff11022d91613
R10: dffffc0000000000 R11: ffffed1022d91614 R12: fffffffffffffffc
R13: ffffc9000113fa20 R14: 1ffff92000227f47 R15: fffffffffffffff4
FS: 00005555582e9380(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffffc CR3: 000000012de74000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: ff 0f decl (%rdi)
2: 84 2b test %ch,(%rbx)
4: 01 00 add %eax,(%rax)
6: 00 4d 8d add %cl,-0x73(%rbp)
9: 67 08 4c 89 e0 or %cl,-0x20(%ecx,%ecx,4)
e: 48 c1 e8 03 shr $0x3,%rax
12: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx
19: fc ff df
1c: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1)
20: 74 08 je 0x2a
22: 4c 89 e7 mov %r12,%rdi
25: e8 d4 28 08 00 call 0x828fe
* 2a: 4d 8b 24 24 mov (%r12),%r12 <-- trapping instruction
2e: 4c 89 6d d0 mov %r13,-0x30(%rbp)
32: 49 83 c5 30 add $0x30,%r13
36: 4c 89 e8 mov %r13,%rax
39: 48 c1 e8 03 shr $0x3,%rax
3d: 48 rex.W
3e: b9 .byte 0xb9
final repro crashed as (corrupted=false):
RBP: 0000000000000001 R08: 00007fff3a5bc177 R09: 00007f1e75530031
R10: 0000000000000001 R11: 0000000000000246 R12: 00007f1e75539618
R13: 00007fff3a5bc5b8 R14: 0000000000000001 R15: 0000000000000001
BUG: unable to handle page fault for address: fffffffffffffffc
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 72ae067 P4D 72ae067 PUD 72b0067 PMD 0
Oops: Oops: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 0 UID: 0 PID: 290 Comm: syz-executor251 Not tainted 6.12.23-syzkaller-gd9fd901baa98 #0 f1acc3ef52b3e732a05c4f7a2560722db90bb473
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:can_vma_merge_left+0x6c/0x4c0 mm/vma.c:296
Code: ff 0f 84 2b 01 00 00 4d 8d 67 08 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 d4 28 08 00 <4d> 8b 24 24 4c 89 6d d0 49 83 c5 30 4c 89 e8 48 c1 e8 03 48 b9 00
RSP: 0018:ffffc9000113f8f8 EFLAGS: 00010246
RAX: 1fffffffffffffff RBX: ffffc9000113fa38 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc9000113fa20
RBP: ffffc9000113f938 R08: ffff888116c8b09f R09: 1ffff11022d91613
R10: dffffc0000000000 R11: ffffed1022d91614 R12: fffffffffffffffc
R13: ffffc9000113fa20 R14: 1ffff92000227f47 R15: fffffffffffffff4
FS: 00005555582e9380(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffffc CR3: 000000012de74000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
vma_merge_existing_range mm/vma.c:703 [inline]
vma_modify+0x250/0x1430 mm/vma.c:1427
vma_modify_flags_uffd+0x15a/0x190 mm/vma.c:1508
userfaultfd_clear_vma+0x1e8/0x260 mm/userfaultfd.c:1894
userfaultfd_release_all+0x280/0x490 mm/userfaultfd.c:2012
userfaultfd_release+0xe2/0x1a0 fs/userfaultfd.c:866
__fput+0x1fb/0xa00 fs/file_table.c:431
__fput_sync+0x4a/0x70 fs/file_table.c:516
__do_sys_close fs/open.c:1590 [inline]
__se_sys_close+0x17b/0x240 fs/open.c:1575
__x64_sys_close+0x3c/0x60 fs/open.c:1575
x64_sys_call+0x2560/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:4
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f1e754ce369
Code: 48 83 c4 28 c3 e8 17 1a 00 00 0f 1f 80 00 00 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff3a5bc3d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 00007fff3a5bc3e0 RCX: 00007f1e754ce369
RDX: 00007f1e754cd6a0 RSI: 00007fff3a5bc3e0 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00007fff3a5bc177 R09: 00007f1e75530031
R10: 0000000000000001 R11: 0000000000000246 R12: 00007f1e75539618
R13: 00007fff3a5bc5b8 R14: 0000000000000001 R15: 0000000000000001
Modules linked in:
CR2: fffffffffffffffc
---[ end trace 0000000000000000 ]---
RIP: 0010:can_vma_merge_left+0x6c/0x4c0 mm/vma.c:296
Code: ff 0f 84 2b 01 00 00 4d 8d 67 08 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 e7 e8 d4 28 08 00 <4d> 8b 24 24 4c 89 6d d0 49 83 c5 30 4c 89 e8 48 c1 e8 03 48 b9 00
RSP: 0018:ffffc9000113f8f8 EFLAGS: 00010246
RAX: 1fffffffffffffff RBX: ffffc9000113fa38 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc9000113fa20
RBP: ffffc9000113f938 R08: ffff888116c8b09f R09: 1ffff11022d91613
R10: dffffc0000000000 R11: ffffed1022d91614 R12: fffffffffffffffc
R13: ffffc9000113fa20 R14: 1ffff92000227f47 R15: fffffffffffffff4
FS: 00005555582e9380(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffffc CR3: 000000012de74000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: ff 0f decl (%rdi)
2: 84 2b test %ch,(%rbx)
4: 01 00 add %eax,(%rax)
6: 00 4d 8d add %cl,-0x73(%rbp)
9: 67 08 4c 89 e0 or %cl,-0x20(%ecx,%ecx,4)
e: 48 c1 e8 03 shr $0x3,%rax
12: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx
19: fc ff df
1c: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1)
20: 74 08 je 0x2a
22: 4c 89 e7 mov %r12,%rdi
25: e8 d4 28 08 00 call 0x828fe
* 2a: 4d 8b 24 24 mov (%r12),%r12 <-- trapping instruction
2e: 4c 89 6d d0 mov %r13,-0x30(%rbp)
32: 49 83 c5 30 add $0x30,%r13
36: 4c 89 e8 mov %r13,%rax
39: 48 c1 e8 03 shr $0x3,%rax
3d: 48 rex.W
3e: b9 .byte 0xb9