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kOD4TlnVWrD/DPDK1BjzBBoZEVV2R7JSOUNrjoEa9sZpIrCERaaIyAMNEMUKFQtPtXV9Pp2RPbv5HwJ07QyASA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR11MB8435 X-OriginatorOrg: intel.com Hello, kernel test robot noticed "BUG:unable_to_handle_page_fault_for_address" on: commit: 53974b87cdc40afc34928cea4c8bf8278e22c5fc ("nsproxy: fix free_nsproxy() and simplify create_new_namespaces()") https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master [test failed on linux-next/master b179ce312bafcb8c68dc718e015aee79b7939ff0] in testcase: trinity version: trinity-i386-abe9de86-1_20230429 with following parameters: runtime: 300s group: group-03 nr_groups: 5 config: i386-randconfig-2006-20250825 compiler: gcc-14 test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G (please refer to attached dmesg/kmsg for entire log/backtrace) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-lkp/202511130911.5f5a69c0-lkp@intel.com [ 87.959060][ T3741] BUG: unable to handle page fault for address: 6b6b6bdf [ 87.959840][ T3741] #PF: supervisor read access in kernel mode [ 87.960464][ T3741] #PF: error_code(0x0000) - not-present page [ 87.961071][ T3741] *pde = 00000000 [ 87.961484][ T3741] Oops: Oops: 0000 [#1] [ 87.961929][ T3741] CPU: 0 UID: 65534 PID: 3741 Comm: trinity-c0 Not tainted 6.18.0-rc3-00109-g53974b87cdc4 #1 PREEMPT(full) 174112d1d4a5052193629697696b6f97a384c988 [ 87.963364][ T3741] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 87.964390][ T3741] EIP: put_pid_ns (include/linux/ns_common.h:70 (discriminator 1) kernel/pid_namespace.c:187 (discriminator 1)) [ 87.964892][ T3741] Code: fa ff 83 c4 10 c9 c3 2e 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 3e 8d 74 26 00 85 c0 74 3d 55 89 e5 53 89 c3 b8 08 00 00 00 <3b> 43 74 b8 00 00 00 00 1b 43 78 73 22 8d 43 70 e8 67 fe ff ff 84 All code ======== 0: fa cli 1: ff 83 c4 10 c9 c3 incl -0x3c36ef3c(%rbx) 7: 2e 8d b4 26 00 00 00 cs lea 0x0(%rsi,%riz,1),%esi e: 00 f: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 16: 3e 8d 74 26 00 ds lea 0x0(%rsi,%riz,1),%esi 1b: 85 c0 test %eax,%eax 1d: 74 3d je 0x5c 1f: 55 push %rbp 20: 89 e5 mov %esp,%ebp 22: 53 push %rbx 23: 89 c3 mov %eax,%ebx 25: b8 08 00 00 00 mov $0x8,%eax 2a:* 3b 43 74 cmp 0x74(%rbx),%eax <-- trapping instruction 2d: b8 00 00 00 00 mov $0x0,%eax 32: 1b 43 78 sbb 0x78(%rbx),%eax 35: 73 22 jae 0x59 37: 8d 43 70 lea 0x70(%rbx),%eax 3a: e8 67 fe ff ff call 0xfffffffffffffea6 3f: 84 .byte 0x84 Code starting with the faulting instruction =========================================== 0: 3b 43 74 cmp 0x74(%rbx),%eax 3: b8 00 00 00 00 mov $0x0,%eax 8: 1b 43 78 sbb 0x78(%rbx),%eax b: 73 22 jae 0x2f d: 8d 43 70 lea 0x70(%rbx),%eax 10: e8 67 fe ff ff call 0xfffffffffffffe7c 15: 84 .byte 0x84 [ 87.966724][ T3741] EAX: 00000008 EBX: 6b6b6b6b ECX: c122f503 EDX: ffffffff [ 87.967423][ T3741] ESI: c88f6478 EDI: ffffffea EBP: ca3c1be8 ESP: ca3c1be4 [ 87.968130][ T3741] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068 EFLAGS: 00010202 [ 87.968908][ T3741] CR0: 80050033 CR2: 6b6b6bdf CR3: 0b261000 CR4: 000406d0 [ 87.969605][ T3741] Call Trace: [ 87.969980][ T3741] nsproxy_free (kernel/nsproxy.c:69) [ 87.970443][ T3741] create_new_namespaces (kernel/nsproxy.c:132) [ 87.970983][ T3741] unshare_nsproxy_namespaces (kernel/nsproxy.c:197 (discriminator 2)) [ 87.971544][ T3741] ksys_unshare (kernel/fork.c:3130) [ 87.972035][ T3741] __ia32_sys_unshare (kernel/fork.c:3199) [ 87.972533][ T3741] ia32_sys_call (kbuild/obj/consumer/i386-randconfig-2006-20250825/./arch/x86/include/generated/asm/syscalls_32.h:311) [ 87.973022][ T3741] do_int80_syscall_32 (arch/x86/entry/syscall_32.c:83 arch/x86/entry/syscall_32.c:259) [ 87.973545][ T3741] ? __might_fault (mm/memory.c:7081 (discriminator 1) mm/memory.c:7075 (discriminator 1)) [ 87.974033][ T3741] ? lock_acquire (include/trace/events/lock.h:24 (discriminator 7) kernel/locking/lockdep.c:5831 (discriminator 7)) [ 87.974569][ T3741] ? __might_fault (mm/memory.c:7081 (discriminator 1) mm/memory.c:7075 (discriminator 1)) [ 87.975055][ T3741] ? find_held_lock (kernel/locking/lockdep.c:5350 (discriminator 1)) [ 87.975544][ T3741] ? __might_fault (mm/memory.c:7081 (discriminator 1) mm/memory.c:7075 (discriminator 1)) [ 87.976036][ T3741] ? __lock_release+0x48/0x100 [ 87.976587][ T3741] ? __might_fault (mm/memory.c:7081 (discriminator 1) mm/memory.c:7075 (discriminator 1)) [ 87.977071][ T3741] ? find_held_lock (kernel/locking/lockdep.c:5350 (discriminator 1)) [ 87.977559][ T3741] ? __probestub_sys_exit (include/linux/rcupdate_trace.h:71) [ 87.978091][ T3741] ? __lock_release+0x48/0x100 [ 87.978642][ T3741] ? __probestub_sys_exit (include/linux/rcupdate_trace.h:71) [ 87.979178][ T3741] ? tracer_hardirqs_off (kernel/trace/trace_irqsoff.c:645 (discriminator 1)) [ 87.979707][ T3741] ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:111) [ 87.980225][ T3741] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4662) [ 87.980940][ T3741] ? do_int80_syscall_32 (arch/x86/entry/syscall_32.c:263) [ 87.981477][ T3741] ? validate_chain (kernel/locking/lockdep.c:3823 kernel/locking/lockdep.c:3876) [ 87.981975][ T3741] ? mark_lock (kernel/locking/lockdep.c:4731 (discriminator 1)) [ 87.982436][ T3741] ? __lock_acquire (kernel/locking/lockdep.c:5237 (discriminator 1)) [ 87.982938][ T3741] ? validate_chain (kernel/locking/lockdep.c:3823 kernel/locking/lockdep.c:3876) [ 87.983432][ T3741] ? mark_lock (kernel/locking/lockdep.c:4731 (discriminator 1)) [ 87.983906][ T3741] ? __lock_acquire (kernel/locking/lockdep.c:5237 (discriminator 1)) [ 87.984416][ T3741] ? __might_fault (mm/memory.c:7081 (discriminator 1) mm/memory.c:7075 (discriminator 1)) [ 87.984900][ T3741] ? lock_acquire (include/trace/events/lock.h:24 (discriminator 7) kernel/locking/lockdep.c:5831 (discriminator 7)) [ 87.985435][ T3741] ? __might_fault (mm/memory.c:7081 (discriminator 1) mm/memory.c:7075 (discriminator 1)) [ 87.985922][ T3741] ? find_held_lock (kernel/locking/lockdep.c:5350 (discriminator 1)) [ 87.986413][ T3741] ? __might_fault (mm/memory.c:7081 (discriminator 1) mm/memory.c:7075 (discriminator 1)) [ 87.986894][ T3741] ? __lock_release+0x48/0x100 [ 87.987440][ T3741] ? __might_fault (mm/memory.c:7081 (discriminator 1) mm/memory.c:7075 (discriminator 1)) [ 87.987929][ T3741] ? find_held_lock (kernel/locking/lockdep.c:5350 (discriminator 1)) [ 87.988420][ T3741] ? __probestub_sys_exit (include/linux/rcupdate_trace.h:71) [ 87.988954][ T3741] ? __lock_release+0x48/0x100 [ 87.989499][ T3741] ? __probestub_sys_exit (include/linux/rcupdate_trace.h:71) [ 87.990029][ T3741] ? tracer_hardirqs_off (kernel/trace/trace_irqsoff.c:645 (discriminator 1)) [ 87.990577][ T3741] ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:111) [ 87.991098][ T3741] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4662) [ 87.991759][ T3741] ? do_int80_syscall_32 (arch/x86/entry/syscall_32.c:263) [ 87.992298][ T3741] ? __probestub_sys_exit (include/linux/rcupdate_trace.h:71) [ 87.992832][ T3741] ? tracer_hardirqs_off (kernel/trace/trace_irqsoff.c:645 (discriminator 1)) [ 87.993352][ T3741] ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:111) [ 87.993873][ T3741] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4662) [ 87.994527][ T3741] ? do_int80_syscall_32 (arch/x86/entry/syscall_32.c:263) [ 87.995065][ T3741] ? do_int80_syscall_32 (arch/x86/entry/syscall_32.c:263) [ 87.995604][ T3741] ? exc_page_fault (arch/x86/mm/fault.c:1536) [ 87.996125][ T3741] entry_INT80_32 (arch/x86/entry/entry_32.S:945) [ 87.996603][ T3741] EIP: 0xb7f52092 [ 87.997006][ T3741] Code: 00 00 00 e9 90 ff ff ff ff a3 24 00 00 00 68 30 00 00 00 e9 80 ff ff ff ff a3 f8 ff ff ff 66 90 00 00 00 00 00 00 00 00 cd 80 8d b4 26 00 00 00 00 8d b6 00 00 00 00 8b 1c 24 c3 8d b4 26 00 All code ======== 0: 00 00 add %al,(%rax) 2: 00 e9 add %ch,%cl 4: 90 nop 5: ff (bad) 6: ff (bad) 7: ff (bad) 8: ff a3 24 00 00 00 jmp *0x24(%rbx) e: 68 30 00 00 00 push $0x30 13: e9 80 ff ff ff jmp 0xffffffffffffff98 18: ff a3 f8 ff ff ff jmp *-0x8(%rbx) 1e: 66 90 xchg %ax,%ax ... 28: cd 80 int $0x80 2a:* c3 ret <-- trapping instruction 2b: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 32: 8d b6 00 00 00 00 lea 0x0(%rsi),%esi 38: 8b 1c 24 mov (%rsp),%ebx 3b: c3 ret 3c: 8d .byte 0x8d 3d: b4 26 mov $0x26,%ah ... Code starting with the faulting instruction =========================================== 0: c3 ret 1: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 8: 8d b6 00 00 00 00 lea 0x0(%rsi),%esi e: 8b 1c 24 mov (%rsp),%ebx 11: c3 ret 12: 8d .byte 0x8d 13: b4 26 mov $0x26,%ah The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20251113/202511130911.5f5a69c0-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki