Extracting prog: 5m33.734041068s
Minimizing prog: 30m15.234870624s
Simplifying prog options: 11m28.629020035s
Extracting C: 1m52.368060614s
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:5 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$nl_route-sendmsg$nl_route
detailed listing:
executing program 0:
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, &(0x7f0000000140)={0x0, 0x0, &(0x7f00000001c0)={&(0x7f0000000080)=@newlink={0x44, 0x10, 0x401, 0x0, 0x0, {0x0, 0x0, 0x0, 0x0, 0x7a00}, [@IFLA_LINKINFO={0x24, 0x12, 0x0, 0x1, @batadv={{0xb}, {0x14, 0x2, 0x0, 0x1, [@IFLA_BATADV_ALGO_NAME={0x10, 0x1, 'BATMAN_V'}]}}}]}, 0xfd12}}, 0x0)

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:5 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$nl_route-sendmsg$nl_route
detailed listing:
executing program 0:
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, &(0x7f0000000140)={0x0, 0x0, &(0x7f00000001c0)={&(0x7f0000000080)=@newlink={0x44, 0x10, 0x401, 0x0, 0x0, {0x0, 0x0, 0x0, 0x0, 0x7a00}, [@IFLA_LINKINFO={0x24, 0x12, 0x0, 0x1, @batadv={{0xb}, {0x14, 0x2, 0x0, 0x1, [@IFLA_BATADV_ALGO_NAME={0x10, 0x1, 'BATMAN_V'}]}}}]}, 0xfd12}}, 0x0)

program crashed: BUG: unable to handle kernel paging request in ext4_mb_load_buddy_gfp
single: successfully extracted reproducer
found reproducer with 2 syscalls
minimizing guilty program
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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$nl_route
detailed listing:
executing program 0:
socket$nl_route(0x10, 0x3, 0x0)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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}}): sendmsg$nl_route
detailed listing:
executing program 0:
sendmsg$nl_route(0xffffffffffffffff, &(0x7f0000000140)={0x0, 0x0, &(0x7f00000001c0)={&(0x7f0000000080)=@newlink={0x44, 0x10, 0x401, 0x0, 0x0, {0x0, 0x0, 0x0, 0x0, 0x7a00}, [@IFLA_LINKINFO={0x24, 0x12, 0x0, 0x1, @batadv={{0xb}, {0x14, 0x2, 0x0, 0x1, [@IFLA_BATADV_ALGO_NAME={0x10, 0x1, 'BATMAN_V'}]}}}]}, 0xfd12}}, 0x0)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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$nl_route-sendmsg$nl_route
detailed listing:
executing program 0:
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, 0x0, 0x0)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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$nl_route-sendmsg$nl_route
detailed listing:
executing program 0:
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, &(0x7f0000000140)={0x0, 0x0, 0x0}, 0x0)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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$nl_route-sendmsg$nl_route
detailed listing:
executing program 0:
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, &(0x7f0000000140)={0x0, 0x0, &(0x7f00000001c0)={0x0}}, 0x0)

program did not crash
extracting C reproducer
testing compiled C program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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$nl_route-sendmsg$nl_route
program crashed: kernel panic: System is deadlocked on memory
a never seen crash title: kernel panic: System is deadlocked on memory, ignore
simplifying guilty program options
testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 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$nl_route-sendmsg$nl_route
detailed listing:
executing program 0:
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, &(0x7f0000000140)={0x0, 0x0, &(0x7f00000001c0)={&(0x7f0000000080)=@newlink={0x44, 0x10, 0x401, 0x0, 0x0, {0x0, 0x0, 0x0, 0x0, 0x7a00}, [@IFLA_LINKINFO={0x24, 0x12, 0x0, 0x1, @batadv={{0xb}, {0x14, 0x2, 0x0, 0x1, [@IFLA_BATADV_ALGO_NAME={0x10, 0x1, 'BATMAN_V'}]}}}]}, 0xfd12}}, 0x0)

program crashed: BUG: unable to handle kernel paging request in ext4_mb_load_buddy_gfp
extracting C reproducer
testing compiled C program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 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$nl_route-sendmsg$nl_route
program crashed: kernel panic: System is deadlocked on memory
a never seen crash title: kernel panic: System is deadlocked on memory, ignore
testing program (duration=6m0s, {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}}): socket$nl_route-sendmsg$nl_route
detailed listing:
executing program 0:
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, &(0x7f0000000140)={0x0, 0x0, &(0x7f00000001c0)={&(0x7f0000000080)=@newlink={0x44, 0x10, 0x401, 0x0, 0x0, {0x0, 0x0, 0x0, 0x0, 0x7a00}, [@IFLA_LINKINFO={0x24, 0x12, 0x0, 0x1, @batadv={{0xb}, {0x14, 0x2, 0x0, 0x1, [@IFLA_BATADV_ALGO_NAME={0x10, 0x1, 'BATMAN_V'}]}}}]}, 0xfd12}}, 0x0)

program did not crash
testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 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$nl_route-sendmsg$nl_route
detailed listing:
executing program 0:
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, &(0x7f0000000140)={0x0, 0x0, &(0x7f00000001c0)={&(0x7f0000000080)=@newlink={0x44, 0x10, 0x401, 0x0, 0x0, {0x0, 0x0, 0x0, 0x0, 0x7a00}, [@IFLA_LINKINFO={0x24, 0x12, 0x0, 0x1, @batadv={{0xb}, {0x14, 0x2, 0x0, 0x1, [@IFLA_BATADV_ALGO_NAME={0x10, 0x1, 'BATMAN_V'}]}}}]}, 0xfd12}}, 0x0)

program crashed: BUG: unable to handle kernel paging request in ext4_mb_load_buddy_gfp
validation run: crashed=true
testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 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$nl_route-sendmsg$nl_route
detailed listing:
executing program 0:
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, &(0x7f0000000140)={0x0, 0x0, &(0x7f00000001c0)={&(0x7f0000000080)=@newlink={0x44, 0x10, 0x401, 0x0, 0x0, {0x0, 0x0, 0x0, 0x0, 0x7a00}, [@IFLA_LINKINFO={0x24, 0x12, 0x0, 0x1, @batadv={{0xb}, {0x14, 0x2, 0x0, 0x1, [@IFLA_BATADV_ALGO_NAME={0x10, 0x1, 'BATMAN_V'}]}}}]}, 0xfd12}}, 0x0)

program crashed: BUG: unable to handle kernel paging request in ext4_mb_load_buddy_gfp
validation run: crashed=true
testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 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$nl_route-sendmsg$nl_route
detailed listing:
executing program 0:
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, &(0x7f0000000140)={0x0, 0x0, &(0x7f00000001c0)={&(0x7f0000000080)=@newlink={0x44, 0x10, 0x401, 0x0, 0x0, {0x0, 0x0, 0x0, 0x0, 0x7a00}, [@IFLA_LINKINFO={0x24, 0x12, 0x0, 0x1, @batadv={{0xb}, {0x14, 0x2, 0x0, 0x1, [@IFLA_BATADV_ALGO_NAME={0x10, 0x1, 'BATMAN_V'}]}}}]}, 0xfd12}}, 0x0)

program crashed: BUG: unable to handle kernel paging request in ext4_mb_load_buddy_gfp
validation run: crashed=true
reproducing took 1h0m9.758351437s
repro crashed as (corrupted=false):
Unable to handle kernel paging request at virtual address dfff800000000001
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
Mem abort info:
  ESR = 0x0000000096000006
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x06: level 2 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000006
  CM = 0, WnR = 0
[dfff800000000001] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 18565 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026
pstate: 02400005 (nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : PageTail include/linux/page-flags.h:292 [inline]
pc : folio_flags include/linux/page-flags.h:319 [inline]
pc : folio_test_uptodate include/linux/page-flags.h:719 [inline]
pc : ext4_mb_load_buddy_gfp+0x21c/0xec0 fs/ext4/mballoc.c:1536
lr : ext4_mb_load_buddy_gfp+0x1e8/0xec0 fs/ext4/mballoc.c:1535
sp : ffff800024256fc0
x29: ffff800024257020 x28: 1ffff0000484ae3c x27: dfff800000000000
x26: 0000000000000008 x25: 0000000000000000 x24: ffff0000c04a96f0
x23: ffff0000c04a96c0 x22: 0000000000000000 x21: 0000000000000001
x20: 1ffff0000484ae3c x19: ffff8000242571d0 x18: 0000000000000000
x17: 0000000000000000 x16: ffff800011ba16d0 x15: 0000000000000000
x14: 0000000000000406 x13: 0000000000ff0100 x12: ffff800016647a88
x11: ff008000086f8b74 x10: 0000000000000000 x9 : 820ba1ee4f31d900
x8 : 820ba1ee4f31d900 x7 : ffff800008704dd0 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000002
x2 : 0000000000000008 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 PageTail include/linux/page-flags.h:-1 [inline]
 folio_flags include/linux/page-flags.h:319 [inline]
 folio_test_uptodate include/linux/page-flags.h:719 [inline]
 ext4_mb_load_buddy_gfp+0x21c/0xec0 fs/ext4/mballoc.c:1536
 ext4_mb_load_buddy fs/ext4/mballoc.c:1641 [inline]
 ext4_mb_regular_allocator+0xfb4/0x2b60 fs/ext4/mballoc.c:2798
 ext4_mb_new_blocks+0xb78/0x4244 fs/ext4/mballoc.c:5793
 ext4_ext_map_blocks+0x12bc/0x5680 fs/ext4/extents.c:4369
 ext4_map_blocks+0x7b0/0x160c fs/ext4/inode.c:681
 ext4_getblk+0x178/0x680 fs/ext4/inode.c:892
 ext4_bread+0x3c/0x1a8 fs/ext4/inode.c:948
 ext4_append+0x23c/0x488 fs/ext4/namei.c:83
 ext4_init_new_dir+0x270/0x4f0 fs/ext4/namei.c:3032
 ext4_mkdir+0x3b8/0xa28 fs/ext4/namei.c:3078
 vfs_mkdir+0x314/0x4d8 fs/namei.c:4161
 do_mkdirat+0x1b8/0x3ec fs/namei.c:4186
 __do_sys_mkdirat fs/namei.c:4201 [inline]
 __se_sys_mkdirat fs/namei.c:4199 [inline]
 __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4199
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x12c arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:589
Code: aa0003f6 d343ff55 f9000ff4 aa1c03f4 (387b6aa8) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	aa0003f6 	mov	x22, x0
   4:	d343ff55 	lsr	x21, x26, #3
   8:	f9000ff4 	str	x20, [sp, #24]
   c:	aa1c03f4 	mov	x20, x28
* 10:	387b6aa8 	ldrb	w8, [x21, x27] <-- trapping instruction

final repro crashed as (corrupted=false):
Unable to handle kernel paging request at virtual address dfff800000000001
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
Mem abort info:
  ESR = 0x0000000096000006
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x06: level 2 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000006
  CM = 0, WnR = 0
[dfff800000000001] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 18565 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026
pstate: 02400005 (nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : PageTail include/linux/page-flags.h:292 [inline]
pc : folio_flags include/linux/page-flags.h:319 [inline]
pc : folio_test_uptodate include/linux/page-flags.h:719 [inline]
pc : ext4_mb_load_buddy_gfp+0x21c/0xec0 fs/ext4/mballoc.c:1536
lr : ext4_mb_load_buddy_gfp+0x1e8/0xec0 fs/ext4/mballoc.c:1535
sp : ffff800024256fc0
x29: ffff800024257020 x28: 1ffff0000484ae3c x27: dfff800000000000
x26: 0000000000000008 x25: 0000000000000000 x24: ffff0000c04a96f0
x23: ffff0000c04a96c0 x22: 0000000000000000 x21: 0000000000000001
x20: 1ffff0000484ae3c x19: ffff8000242571d0 x18: 0000000000000000
x17: 0000000000000000 x16: ffff800011ba16d0 x15: 0000000000000000
x14: 0000000000000406 x13: 0000000000ff0100 x12: ffff800016647a88
x11: ff008000086f8b74 x10: 0000000000000000 x9 : 820ba1ee4f31d900
x8 : 820ba1ee4f31d900 x7 : ffff800008704dd0 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000002
x2 : 0000000000000008 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 PageTail include/linux/page-flags.h:-1 [inline]
 folio_flags include/linux/page-flags.h:319 [inline]
 folio_test_uptodate include/linux/page-flags.h:719 [inline]
 ext4_mb_load_buddy_gfp+0x21c/0xec0 fs/ext4/mballoc.c:1536
 ext4_mb_load_buddy fs/ext4/mballoc.c:1641 [inline]
 ext4_mb_regular_allocator+0xfb4/0x2b60 fs/ext4/mballoc.c:2798
 ext4_mb_new_blocks+0xb78/0x4244 fs/ext4/mballoc.c:5793
 ext4_ext_map_blocks+0x12bc/0x5680 fs/ext4/extents.c:4369
 ext4_map_blocks+0x7b0/0x160c fs/ext4/inode.c:681
 ext4_getblk+0x178/0x680 fs/ext4/inode.c:892
 ext4_bread+0x3c/0x1a8 fs/ext4/inode.c:948
 ext4_append+0x23c/0x488 fs/ext4/namei.c:83
 ext4_init_new_dir+0x270/0x4f0 fs/ext4/namei.c:3032
 ext4_mkdir+0x3b8/0xa28 fs/ext4/namei.c:3078
 vfs_mkdir+0x314/0x4d8 fs/namei.c:4161
 do_mkdirat+0x1b8/0x3ec fs/namei.c:4186
 __do_sys_mkdirat fs/namei.c:4201 [inline]
 __se_sys_mkdirat fs/namei.c:4199 [inline]
 __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4199
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x12c arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:589
Code: aa0003f6 d343ff55 f9000ff4 aa1c03f4 (387b6aa8) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	aa0003f6 	mov	x22, x0
   4:	d343ff55 	lsr	x21, x26, #3
   8:	f9000ff4 	str	x20, [sp, #24]
   c:	aa1c03f4 	mov	x20, x28
* 10:	387b6aa8 	ldrb	w8, [x21, x27] <-- trapping instruction