syzbot
BUG: unable to handle kernel NULL pointer dereference in pc_clock_gettime
Status:
fixed on 2026/01/07 12:29
Subsystems:
net
[Documentation on labels]
Reported-by: syzbot+c8c0e7ccabd456541612@syzkaller.appspotmail.com
Fix commit:
6ab753b5d8e5
gve: Implement gettimex64 with -EOPNOTSUPP
First crash: 302d, last: 271d
Sample crash report:
Unable
Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
Mem abort info:
ESR = 0x0000000086000006
EC = 0x21: IABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
FSC = 0x06: level 2 translation fault
user pgtable: 4k pages, 48-bit VAs, pgdp=0000000134566000
[0000000000000000] pgd=080000012d9f8403, p4d=080000012d9f8403, pud=080000011fb8e403, pmd=0000000000000000
Internal error: Oops: 0000000086000006 [#1] SMP
Modules linked in:
CPU: 0 UID: 0 PID: 7154 Comm: syz.2.59 Not tainted syzkaller #0 PREEMPT
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
pstate: 83400805 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=-c)
pc : 0x0
lr : ptp_clock_gettime+0xa4/0xb8 drivers/ptp/ptp_clock.c:118
sp : ffff8000a13f7c70
x29: ffff8000a13f7c70 x28: ffff0000d3e83d80 x27: fffffffffffffffb
x26: 1fffe0001a7d07b0 x25: ffff80008aedca60 x24: ffff8000a13f7ce0
x23: dfff800000000000 x22: dfff800000000000 x21: 0000000000000000
x20: ffff0000cc604800 x19: ffff8000a13f7d00 x18: 0000000000000000
x17: 0000000000000000 x16: ffff800082deb748 x15: 0000000000000001
x14: 1fffe00019a73819 x13: 0000000000000000 x12: 0000000000000000
x11: 0000000000080000 x10: 00000000000000eb x9 : ffff8000a6b3e000
x8 : 0000000000000000 x7 : ffff800080654324 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80008ae07bd4
x2 : 0000000000000001 x1 : ffff8000a13f7d00 x0 : ffff0000cc604800
Call trace:
0x0 (P)
pc_clock_gettime+0x148/0x1a8 kernel/time/posix-clock.c:258
__do_sys_clock_gettime kernel/time/posix-timers.c:1144 [inline]
__se_sys_clock_gettime kernel/time/posix-timers.c:1134 [inline]
__arm64_sys_clock_gettime+0x1b4/0x248 kernel/time/posix-timers.c:1134
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
el0_svc_common+0x1e0/0x23c arch/arm64/kernel/syscall.c:132
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:746
el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
---[ end trace 0000000000000000 ]---
* Struck through repros no longer work on HEAD.