syzbot


BUG: unable to handle kernel NULL pointer dereference in pc_clock_gettime

Status: moderation: reported on 2025/10/11 05:15
Subsystems: net
[Documentation on labels]
Reported-by: syzbot+20c39988b29c15d4db83@syzkaller.appspotmail.com
First crash: 15d, last: 22h24m

Sample crash report:
exFAT-fs (loop3): failed to load upcase table (idx : 0x00010000, chksum : 0x36e00b20, utbl_chksum : 0xe619d30d)
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=00000001081eb000
[0000000000000000] pgd=0800000133ebe403, p4d=0800000133ebe403, pud=080000010cef8403, pmd=0000000000000000
Internal error: Oops: 0000000086000006 [#1]  SMP
Modules linked in:
CPU: 0 UID: 0 PID: 8642 Comm: syz.3.582 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
pstate: 83400805 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=-c)
pc : 0x0
lr : ptp_clock_gettime+0xa4/0xb8 drivers/ptp/ptp_clock.c:114
sp : ffff80009c2c7c70
x29: ffff80009c2c7c70 x28: ffff0000d368bd00 x27: fffffffffffffffb
x26: 1fffe0001a6d17a0 x25: ffff80008ae1b6e0 x24: ffff80009c2c7ce0
x23: dfff800000000000 x22: dfff800000000000 x21: 0000000000000000
x20: ffff0000cd0c1e00 x19: ffff80009c2c7d00 x18: 0000000000000000
x17: 0000000000000000 x16: ffff80008ad3f804 x15: 0000000000000001
x14: 1fffe00019adbc19 x13: 0000000000000000 x12: 0000000000000000
x11: 0000000000080000 x10: 00000000000000ea x9 : ffff8000a82f4000
x8 : 0000000000000000 x7 : ffff800080650bb4 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80008ad53ed8
x2 : 0000000000000001 x1 : ffff80009c2c7d00 x0 : ffff0000cd0c1e00
Call trace:
 0x0 (P)
 pc_clock_gettime+0x148/0x1a8 kernel/time/posix-clock.c:258
 __do_sys_clock_gettime kernel/time/posix-timers.c:1145 [inline]
 __se_sys_clock_gettime kernel/time/posix-timers.c:1135 [inline]
 __arm64_sys_clock_gettime+0x1b4/0x248 kernel/time/posix-timers.c:1135
 __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:744
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:763
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
Code: ???????? ???????? ???????? ???????? (????????) 
---[ end trace 0000000000000000 ]---

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/10/21 13:32 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci bf45a62baffc 9832ed61 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel NULL pointer dereference in pc_clock_gettime
2025/10/20 20:53 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci bf45a62baffc 9832ed61 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel NULL pointer dereference in pc_clock_gettime
2025/10/08 11:47 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci bf45a62baffc 7e2882b3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel NULL pointer dereference in pc_clock_gettime
2025/10/07 05:10 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci bf45a62baffc 8ef35d49 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 BUG: unable to handle kernel NULL pointer dereference in pc_clock_gettime
* Struck through repros no longer work on HEAD.